US20080020961A1 - Low Molecular Weight Graft Copolymers - Google Patents

Low Molecular Weight Graft Copolymers Download PDF

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Publication number
US20080020961A1
US20080020961A1 US11/780,494 US78049407A US2008020961A1 US 20080020961 A1 US20080020961 A1 US 20080020961A1 US 78049407 A US78049407 A US 78049407A US 2008020961 A1 US2008020961 A1 US 2008020961A1
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Prior art keywords
graft copolymer
grams
water
solution
composition
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US11/780,494
Inventor
Klin A. Rodrigues
Jannifer Sanders
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Akzo Nobel NV
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National Starch and Chemical Investment Holding Corp
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Priority claimed from US11/459,233 external-priority patent/US20080021168A1/en
Priority to NO20073821A priority Critical patent/NO20073821L/en
Priority to US11/780,494 priority patent/US20080020961A1/en
Application filed by National Starch and Chemical Investment Holding Corp filed Critical National Starch and Chemical Investment Holding Corp
Priority to CA002594464A priority patent/CA2594464A1/en
Priority to CN200710169190.XA priority patent/CN101260177B/en
Priority to EP07014412A priority patent/EP1881016A3/en
Assigned to NATIONAL STARCH AND CHEMICAL INVESTMENT HOLDING CORP. reassignment NATIONAL STARCH AND CHEMICAL INVESTMENT HOLDING CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RODRIGUES, KLIN A., SANDERS, JANNIFER
Assigned to NATIONAL STARCH AND CHEMICAL INVESTMENT HOLDING CORPORATION reassignment NATIONAL STARCH AND CHEMICAL INVESTMENT HOLDING CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LE, NGOC THUY
Publication of US20080020961A1 publication Critical patent/US20080020961A1/en
Assigned to AKZO NOBEL N.V. reassignment AKZO NOBEL N.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NATIONAL STARCH AND CHEMICAL INVESTMENT HOLDING CORPORATION
Priority to US12/888,618 priority patent/US8227381B2/en
Abandoned legal-status Critical Current

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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F251/00Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
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    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/10Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
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    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24Macromolecular compounds
    • C04B24/26Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2641Polyacrylates; Polymethacrylates
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    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24Macromolecular compounds
    • C04B24/26Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2664Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of ethylenically unsaturated dicarboxylic acid polymers, e.g. maleic anhydride copolymers
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    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
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    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F251/00Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
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    • C08F289/00Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds not provided for in groups C08F251/00 - C08F287/00
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    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F291/00Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds according to more than one of the groups C08F251/00 - C08F289/00
    • C08F291/06Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds according to more than one of the groups C08F251/00 - C08F289/00 on to oxygen-containing macromolecules
    • C08F291/08Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds according to more than one of the groups C08F251/00 - C08F289/00 on to oxygen-containing macromolecules on to macromolecules containing hydroxy radicals
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L51/003Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
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    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L51/02Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to polysaccharides
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L51/08Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D151/00Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
    • C09D151/003Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D151/00Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
    • C09D151/02Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to polysaccharides
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D151/00Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
    • C09D151/08Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/45Anti-settling agents
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    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02Well-drilling compositions
    • C09K8/04Aqueous well-drilling compositions
    • C09K8/06Clay-free compositions
    • C09K8/12Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
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    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02Well-drilling compositions
    • C09K8/04Aqueous well-drilling compositions
    • C09K8/14Clay-containing compositions
    • C09K8/18Clay-containing compositions characterised by the organic compounds
    • C09K8/22Synthetic organic compounds
    • C09K8/24Polymers
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    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/42Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/46Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
    • C09K8/467Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
    • CCHEMISTRY; METALLURGY
    • C11ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11DDETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16Organic compounds
    • C11D3/37Polymers
    • C11D3/3788Graft polymers
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    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F14/00Inhibiting incrustation in apparatus for heating liquids for physical or chemical purposes
    • C23F14/02Inhibiting incrustation in apparatus for heating liquids for physical or chemical purposes by chemical means
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    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/10Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0045Polymers chosen for their physico-chemical characteristics
    • C04B2103/0059Graft (co-)polymers

Definitions

  • the present invention relates to graft copolymers of synthetic and naturally derived materials. More particularly, the present invention is directed towards low molecular weight graft copolymers, as well as anti-scalant and/or dispersant formulations or compositions comprising such polymers and their use in aqueous systems, including scale minimization and dispersancy.
  • aqueous industrial systems require that various materials remain in a soluble, suspended or dispersed state.
  • aqueous systems include boiler water or steam generating systems, cooling water systems, gas scrubbing systems, pulp and paper mill systems, desalination systems, fabric, dishware and hard surface cleaning systems, as well as downhole systems encountered during the production of gas, oil, and geothermal wells.
  • the water in those systems either naturally or by contamination contains ingredients such as inorganic salts. These salts can cause accumulation, deposition, and fouling problems in aqueous systems such as those mentioned above if they are not kept in a soluble, suspended or dispersed state.
  • Inorganic salts are typically formed by the reaction of metal cations (e.g., calcium, magnesium or barium) with inorganic anions (e.g., phosphate, carbonate or sulfate).
  • metal cations e.g., calcium, magnesium or barium
  • inorganic anions e.g., phosphate, carbonate or sulfate.
  • the salts tend to be insoluble or have low solubility in water.
  • the salts can precipitate from solution, crystallize and form hard deposits or scale on surfaces. This scale formation is a problem in equipment such as heat transfer devices, boilers, secondary oil recovery wells, and automatic dishwashers, as well as on substrates washed with such hard waters, causing a reduction in the performance and life of the equipment.
  • inorganic particulates such as mud, silt and clay can also be commonly found in cooling water systems. These particulates tend to settle onto surfaces, thereby restricting water flow and heat transfer unless they are effectively dispersed. Synthetic polymers such as polyacrylic acid are well known as excellent dispersants for these inorganic particulates.
  • Stabilization of aqueous systems containing scale-forming salts and inorganic particulates involves a variety of mechanisms. Dispersion of precipitated salt crystals in an aqueous solution is one conventional mechanism for eliminating the deleterious effect of scale-forming salts. In this mechanism, the precipitants remain dispersed, as opposed to settling or dissolving in the aqueous solution. Synthetic polymers having carboxylic acid groups function as good dispersants for precipitated salts such as calcium carbonates.
  • Another stabilization mechanism is inhibiting the formation of scale-forming salts.
  • synthetic polymer(s) that can increase the solubility of scale-forming salts in an aqueous system are added.
  • a third stabilization mechanism involves interference and distortion of the crystal structure of the scale by introduction of certain synthetic polymer(s), thereby making the scale less adherent to surfaces, other forming crystals and/or existing particulates.
  • Synthetic polymers such as polyacrylic acid have been used to minimize scale formation in aqueous treatment systems for a number of years. Synthetic polymers can also impart many useful functions in cleaning compositions. For example, polyacrylic acid is widely used as a viscosity reducer in processing powdered detergents. Synthetic polymers can also serve as anti-redeposition agents, dispersants, scale and deposit inhibitors, and/or crystal modifiers, thereby improving whiteness maintenance in the washing process.
  • Cleaning formulations can contain builders such as phosphates and carbonates for boosting their cleaning performance. These builders tend to precipitate out in the form of insoluble salts such as calcium carbonate, calcium phosphate, and calcium orthophosphate. The precipitants form deposits on clothes and dishware, resulting in unsightly films and spots on these articles. Similarly, these insoluble salts can cause major problem in downhole oilfield applications. Synthetic polymers such as polyacrylic acid are widely used to minimize the scaling of insoluble salts in water treatment, oilfield and cleaning formulations.
  • graft copolymers typically do not perform as well as synthetic polymers in applications such as those described above (e.g., inhibition, dispersion and/or interference). Therefore, there is a need for graft copolymers that perform at least as well as their synthetic counterparts.
  • the present invention discloses low molecular weight graft copolymers that function as an effective and at least partial replacement for synthetic polymers (e.g., polyacrylic acid) used in dispersancy applications in aqueous treatment systems. Additionally, the present invention discloses graft copolymers having a high degree of the natural component or constituent. Finally, the present invention discloses low or slightly colored graft copolymers and the processes for preparing these copolymers.
  • synthetic polymers e.g., polyacrylic acid
  • Low molecular weight graft copolymers according to the present invention are effective at minimizing a number of different scales, including phosphate, sulfonate, carbonate and silicate based scales.
  • the scale-minimizing polymers are useful in a variety of systems, including water treatment compositions, oil field related compositions, cement compositions, cleaning formulations and other aqueous treatment compositions.
  • Polymers according to the present invention have been found to be particularly useful in minimizing scale by dispersing precipitants, inhibiting scale formation, and/or interference and distortion of crystal structure.
  • low molecular weight graft copolymer may be produced by grafting synthetic monomers onto hydroxyl-containing natural moieties.
  • the resulting materials provide the performance of synthetic polymers while making use of lower cost, readily available and environmentally friendly materials derived from renewable sources. These materials can be used in water treatment, detergent, oil field and other dispersant applications.
  • the low molecular weight graft copolymer is useful as a dispersant in water treatment and oilfield applications.
  • the polymer is present in an amount of about 0.001% to about 25% by weight of the composition.
  • the present invention further provides a process for making lighter color graft copolymers. In one aspect, this can be achieved by carrying out the polymerization reaction at acidic pH. Additionally, use of copper salts and lower feed times in the process allows for production of products low in color.
  • the present invention provides for low molecular weight graft copolymers having a synthetic component formed from at least one or more olefinically unsaturated carboxylic acid monomers or salts thereof, and a natural component formed from a hydroxyl-containing natural moiety.
  • the number average molecular weight of the graft copolymer is about 100,000 or less, and the weight percent of the natural component in the graft copolymer is about 5 wt % or greater based on total weight of the graft copolymer.
  • the synthetic component in graft copolymers according to the present invention is further formed from one or more monomers having a nonionic, hydrophobic and/or sulfonic acid group, wherein the one or more monomers are incorporated into the copolymer in an amount of about 50 weight percent or less based on total weight of the graft copolymer. In another aspect, the one or more monomers are incorporated into the copolymer in an amount of about 10 weight percent or less based on total weight of the graft copolymer.
  • the hydroxyl-containing natural moiety of the graft copolymer can be water soluble. In another aspect, the hydroxyl-containing natural moiety is degraded.
  • the carboxylic acid monomer of the graft copolymer can be, for example, acrylic acid, maleic acid, methacrylic acid or mixtures thereof In one aspect, the carboxylic acid monomer is acrylic acid. In another aspect, the carboxylic acid monomer is acrylic acid and maleic acid.
  • the weight percent of the natural component in the graft copolymer can be about 50 wt % or greater based on total weight of the graft copolymer.
  • the natural component include glycerol, citric acid, maltodextrins, pyrodextrins, corn syrups, maltose, sucrose, low molecular weight oxidized starches and mixtures thereof.
  • the present invention is directed towards cleaning compositions comprising the graft copolymer according to the present invention.
  • the graft copolymer can be present in the cleaning composition in an amount of from about 0.01 to about 10 weight %, based on total weight of the cleaning composition.
  • the cleaning composition can include one or more adjuvants.
  • the cleaning composition can be a detergent composition, with the graft copolymer having a Gardner color of about 12 or less.
  • the detergent composition can be a powdered detergent or unit dose composition.
  • the detergent composition can be an autodish composition.
  • the detergent composition can be a zero phosphate composition.
  • the present invention is also directed towards a method of reducing spotting and/or filming in the rinse cycle of an automatic dishwasher by adding to the rinse cycle a rinse aid composition comprising a graft copolymer according to the present invention.
  • the present invention is directed towards a method of improving sequestration, threshold inhibition and soil removal in a cleaning composition by adding a graft copolymer according to the present invention to a cleaning composition.
  • the present invention is directed towards water treatment systems comprising graft copolymers according to the present invention.
  • the graft copolymer can be present in the system in an amount of at least about 0.5 mg/L.
  • the present invention is directed towards a method of dispersing and/or minimizing scale in an aqueous system by adding a graft copolymer according to the present invention to a water treatment system.
  • the present invention is directed towards a method of dispersing pigments and/or minerals in an aqueous system by adding a dispersant composition comprising a graft copolymer according to the present invention to the aqueous system.
  • the minerals dispersed include, for example, titanium dioxide, kaolin clays, modified kaolin clays, calcium carbonates and synthetic calcium carbonates, iron oxides, carbon black, talc, mica, silica, silicates, aluminum oxide or mixtures thereof.
  • the present invention is directed towards a method of dispersing soils and/or dirt from hard and/or soft surfaces by treating the hard and/or soft surfaces with a cleaning composition comprising a graft copolymer according to the present invention.
  • the present invention is directed towards a method of dispersing soils and/or dirt in aqueous systems by treating the aqueous system with an aqueous treatment composition comprising a graft copolymer according to the present invention.
  • the present invention also provides for a process for producing low molecular weight graft copolymers having a synthetic component and a natural component.
  • the process includes degrading the natural component to a number average molecular weight of about 100,000 or less, reacting the natural component with a free radical initiating system having a metal ion to generate free radicals on the natural component, and polymerizing the free radical-containing natural component with a synthetic component.
  • the resultant low molecular weight graft copolymer has a Gardner color of about 12 or less.
  • the process can also include polymerizing the free radical-containing natural component with the synthetic component at ambient pressure and a reaction temperature of about 40° C. to about 130° C.
  • the metal ion in the free radical initiating system can be a Cu (II) salt. In one aspect, polymerization can occur at a pH of about 6 or less.
  • Low molecular weight graft copolymers according to the present invention are produced by grafting synthetic monomers onto hydroxyl-containing naturally derived materials.
  • hydroxyl-containing naturally derived materials range from small molecules such as glycerol, citric acid, lactic acid, tartaric acid, gluconic acid, glucoheptonic acid, monosaccharides and disaccharides such as sugars, to larger molecules such as oligosaccharides and polysaccharides (e.g., maltodextrins and starches). Examples of these include sucrose, fructose, maltose, glucose, and saccharose, as well as reaction products of saccharides such as mannitol, sorbitol and so forth.
  • glycerol is a by-product of biodiesel production. Glycerol is also a by-product of oils and fats used in the manufacture of soaps and fatty acids. It can also be produced by fermentation of sugar. Citric acid is produced industrially by fermentation of crude sugar solutions. Lactic acid is produced commercially by fermentation of whey, cornstarch, potatoes, molasses, etc. Tartaric acid is one byproduct of the wine making process.
  • Polysaccharides useful in the present invention can also be derived from plant, animal and microbial sources.
  • examples of such polysaccharides include starch, cellulose, gums (e.g., gum arabic, guar and xanthan), alginates, pectin and gellan.
  • Starches include those derived from maize and conventional hybrids of maize, such as waxy maize and high amylose (greater than 40% amylose) maize, as well as other starches such as potato, tapioca, wheat, rice, pea, sago, oat, barley, rye, and amaranth, including conventional hybrids or genetically engineered materials.
  • hemicellulose or plant cell wall polysaccharides such as D-xylans. Examples of plant cell wall polysaccharides include arabino-xylans such as corn fiber gum, a component of corn fiber.
  • Useful polysaccharides should be water soluble during the reaction. This implies that the polysaccharides either have a molecular weight low enough to be water soluble or can be hydrolyzed in situ during the reaction to become water soluble. For example, non-degraded starches are not water soluble. However, degraded starches are water soluble and can be used.
  • hydroxyl-containing natural materials include oxidatively, hydrolytically or enzymatically degraded monosaccharides, oligosaccharides and polysaccharides, as well as chemically modified monosaccharides, oligosaccharides and polysaccharides.
  • Chemically modified derivatives include carboxylates, sulfonates, phosphates, phosphonates, aldehydes, silanes, alkyl glycosides, alkyl-hydroxyalkyls, carboxy-alkyl ethers and other derivatives.
  • the polysaccharide can be chemically modified before, during or after the grafting reaction.
  • degraded polysaccharides according to the present invention can have a number average molecular weight of about 100,000 or lower.
  • the number average molecular weight (Mn) of the low molecular weight graft copolymer is about 25,000 or less.
  • the degraded polysaccharides have a number average molecular weight of about 10,000 or less.
  • Polysaccharides useful in the present invention further include pyrodextrins.
  • Pyrodextrins are made by heating acidified, commercially dry starch to a high temperature. Extensive degradation occurs initially due to the usual moisture present in starch. However, unlike the above reactions that are done in aqueous solution, pyrodextrins are formed by heating powders. As moisture is driven off by the heating, hydrolysis stops and recombination of hydrolyzed starch fragments occur. This recombination reaction makes these materials distinct from maltodextrins, which are hydrolyzed starch fragments. The resulting pyrodextrin product also has much lower reducing sugar content, as well as color and a distinct odor.
  • maltodextrins are polymers having D -glucose units linked primarily by ⁇ -1,4 bonds and a dextrose equivalent (‘DE’) of less than about 20.
  • Dextrose equivalent is a measure of the extent of starch hydrolysis. It is determined by measuring the amount of reducing sugars in a sample relative to dextrose (glucose). The DE of dextrose is 100, representing 100% hydrolysis. The DE value gives the extent of hydrolysis (e.g., 10 DE is more hydrolyzed than 5 DE maltodextrin).
  • Maltodextrins are available as a white powder or concentrated solution and are prepared by the partial hydrolysis of starch with acid and/or enzymes.
  • Polysaccharides useful in the present invention can further include corn syrups.
  • Corn syrups are defined as degraded starch products having a DE of 27 to 95.
  • specialty corn syrups include high fructose corn syrup and high maltose corn syrup.
  • Monosaccharides and oligosaccharides such as galactose, mannose, sucrose, ribose, trehalose, lactose, etc., can be used.
  • Polysaccharides can be modified or derivatized by etherification (e.g., via treatment with propylene oxide, ethylene oxide, 2,3-epoxypropyl trimethyl ammonium chloride), esterification (e.g., via reaction with acetic anhydride, octenyl succinic anhydride (‘OSA’)), acid hydrolysis, dextrinization, oxidation or enzyme treatment (e.g., starch modified with ⁇ -amylase, ⁇ -amylase, pullanase, isoamylase or glucoamylase), or various combinations of these treatments. These treatments can be performed before or after the graft copolymerization process.
  • etherification e.g., via treatment with propylene oxide, ethylene oxide, 2,3-epoxypropyl trimethyl ammonium chloride
  • esterification e.g., via reaction with acetic anhydride, octenyl succinic anhydride (‘OSA’)
  • the natural component of the low molecular weight graft copolymer is glycerol, citric acid, maltodextrins and/or low molecular weight oxidized starches.
  • Low molecular weight graft copolymers according to the present invention are grafted using olefinically unsaturated carboxylic acid monomers as the synthetic component.
  • olefinically unsaturated carboxylic acid monomers include, for example, aliphatic, branched or cyclic, mono- or dicarboxylic acids, the alkali or alkaline earth metal or ammonium salts thereof, and the anhydrides thereof.
  • olefinically unsaturated carboxylic acid monomers include but are not limited to acrylic acid, methacrylic acid, ethacrylic acid, ⁇ -chloro-acrylic acid, ⁇ -cyano acrylic acid, ⁇ -methyl-acrylic acid (crotonic acid), ⁇ -phenyl acrylic acid, ⁇ -acryloxy propionic acid, sorbic acid, ⁇ -chloro sorbic acid, angelic acid, cinnamic acid, p-chloro cinnamic acid, ⁇ -styryl acrylic acid (1-carboxy-4-phenyl butadiene-1,3), itaconic acid, maleic acid, citraconic acid, mesaconic acid, glutaconic acid, aconitic acid, fumaric acid, tricarboxy ethylene, and 2-acryloxypropionic acid.
  • Moieties such as maleic anhydride or acrylamide that can be derivatized to an acid containing group can be used.
  • Combinations of olefinically unsaturated carboxylic acid monomers can also be used.
  • the olefinically unsaturated carboxylic acid monomer is acrylic acid, maleic acid, or methacrylic acid, or mixtures thereof.
  • These optional monomers can be a monomer with a non-ionic, hydrophobic or sulfonic acid group.
  • the monomer can be incorporated into the copolymer at about 50 or less weight percent based on total weight of the low molecular weight graft copolymer.
  • the optional monomer can be added at about 10 or less weight percent of the graft copolymer.
  • the optional monomer can be added at about 4 or less weight percent of the graft copolymer.
  • optional monomers with sulfonic acid groups include 2-acrylamido-2-methyl propane sulfonic acid, vinyl sulfonic acid, sodium methallyl sulfonate, sulfonated styrene, allyloxybenzene sulfonic acid and combinations thereof.
  • optional hydrophobic monomers include saturated or unsaturated alkyl, hydroxyalkyl, alkylalkoxy groups, arylalkoxy, alkarylalkoxy, aryl and aryl-alkyl groups, alkyl sulfonate, aryl sulfonate, siloxane and combinations thereof.
  • hydrophobic monomers examples include styrene, ⁇ -methyl styrene, methyl methacrylate, methyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, lauryl acrylate, stearyl acrylate, behenyl acrylate, 2-ethylhexyl methacrylate, octyl methacrylate, lauryl methacrylate, stearyl methacrylate, behenyl methacrylate, 2-ethylhexyl acrylamide, octyl acrylamide, lauryl acrylamide, stearyl acrylamide, behenyl acrylamide, propyl acrylate, butyl acrylate, pentyl acrylate, hexyl acrylate, 1-vinyl naphthalene, 2-vinyl naphthalene, 3-methyl styrene, 4-propyl styrene,
  • optional non-ionic monomers include C 1 -C 6 alkyl esters of (meth)acrylic acid and the alkali or alkaline earth metal or ammonium salts thereof, acrylamide and the C 1 -C 6 alkyl-substituted acrylamides, the N-alkyl-substituted acrylamides and the N-alkanol-substituted acrylamides, hydroxyl alkyl acrylates and acrylamides.
  • the C 1 -C 6 alkyl esters and C 1 -C 6 alkyl half-esters of unsaturated vinylic acids such as maleic acid and itaconic acid
  • C 1 -C 6 alkyl esters of saturated aliphatic monocarboxylic acids such as acetic acid, propionic acid and valeric acid.
  • the nonionic monomers are selected from the group consisting of methyl methacrylate, methyl acrylate, hydroxyethyl(meth)acrylate and hydroxypropyl(meth)acrylate.
  • Low molecular weight copolymers according to the present invention perform similar to their synthetic counterparts, even at relatively high levels of the natural component within the copolymer.
  • the natural component of the low molecular weight graft copolymer can be from about 10 to about 95 weight % based on total weight of the polymer. In one aspect, the range is from about 20 to about 85 weight % of the natural component based on total weight of the polymer. In another aspect, the weight percent of the natural component in the low molecular weight graft copolymer is about 40 wt % or greater based on total weight of the polymer. In even another aspect, the weight percent of the natural component in the low molecular weight graft copolymer is about 60 wt % or greater. In another aspect, the weight percent of the natural component in the low molecular weight graft copolymer is about 80 wt % or greater.
  • materials described in the art tend to drop in performance when the amount of natural component is increased. This level depends on the monomers used and the end use application of the product. For example, in the case of acrylic acid grafted materials used in dispersant application, low molecular weight copolymers according to the present invention perform similar to their synthetic counterpart, even when the level of natural component is greater than 50, and even 65 weight percent of the polymer (see, e.g., Examples 6 and 7 infra), whereas graft copolymers found in the art do not (see, e.g., Comparative Example 1 infra).
  • the number average molecular weight (Mn) of the low molecular weight graft copolymer is less than 100,000. In another aspect, the number average molecular weight of the low molecular weight graft copolymer is less than 25,000. In another aspect, the number average molecular weight of the polymer is less than 10,000. Optimum molecular weight depends on the monomers used in the grafting process and end use application. For example, acrylic acid grafted materials have been found to be excellent dispersants at Mn of less than 10,000.
  • the natural component has a number average molecular weight of about 100,000 or lower. In another aspect, the natural component has a number average molecular weight of about 10,000 or lower.
  • Natural component include materials such as maltodextrins and corn syrups having a DE of about 5 or greater. In another aspect, natural components have a DE of about 10 or greater.
  • Low molecular weight graft copolymers according to the present invention have been found to be excellent dispersants in a wide variety of aqueous systems. These systems include but are not limited to water treatment, cleaning formulations, oilfield and pigment dispersion. These systems are described in further detail below. In another aspect, the low molecular weight graft copolymers have been found to be excellent sizing agents for fiberglass, non-wovens and textiles.
  • Low molecular weight graft copolymers according to the present invention can also be used in a variety of cleaning formulations.
  • Such formulations include both powdered and liquid laundry formulations such as compact and heavy duty detergents (e.g., builders, surfactants, enzymes, etc.), automatic dishwashing detergent formulations (e.g., builders, surfactants, enzymes, etc.), light-duty liquid dishwashing formulations, rinse aid formulations (e.g., acid, nonionic low foaming surfactants, carrier, etc.) and/or hard surface cleaning formulations (e.g., zwitterionic surfactants, germicide, etc.).
  • compact and heavy duty detergents e.g., builders, surfactants, enzymes, etc.
  • automatic dishwashing detergent formulations e.g., builders, surfactants, enzymes, etc.
  • light-duty liquid dishwashing formulations e.g., rinse aid formulations (e.g., acid, nonionic low foaming surfactants, carrier,
  • the graft copolymers can be used as viscosity reducers in processing powdered detergents. They can also serve as anti-redeposition agents, dispersants, scale and deposit inhibitors, and crystal modifiers, providing whiteness maintenance in the washing process.
  • adjunct ingredient in any suitable amount can be used in the cleaning formulations described herein.
  • Useful adjunct ingredients include, but are not limited to, aesthetic agents, anti-filming agents, antiredeposition agents, anti-spotting agents, beads, binders, bleach activators, bleach catalysts, bleach stabilizing systems, bleaching agents, brighteners, buffering agents, builders, carriers, chelants, clay, color speckles, control release agents, corrosion inhibitors, dishcare agents, disinfectant, dispersant agents, draining promoting agents, drying agents, dyes, dye transfer inhibiting agents, enzymes, enzyme stabilizing systems, fillers, free radical inhibitors, fungicides, germicides, hydrotropes, opacifiers, perfumes, pH adjusting agents, pigments, processing aids, silicates, soil release agents, suds suppressors, surfactants, stabilizers, thickeners, zeolite, and mixtures thereof.
  • the cleaning formulations can further include builders, enzymes, surfactants, bleaching agents, bleach modifying materials, carriers, acids, corrosion inhibitors and aesthetic agents.
  • Suitable builders include, but are not limited to, alkali metals, ammonium and alkanol ammonium salts of polyphosphates, alkali metal silicates, alkaline earth and alkali metal carbonates, nitrilotriacetic acids, polycarboxylates, (such as citric acid, mellitic acid, succinic acid, oxydisuccinic acid, polymaleic acid, benzene 1,3,5-tricarboxylic acid, carboxymethyl oxysuccinic acid, and water-soluble salts thereof), phosphates (e.g., sodium tripolyphosphate), and mixtures thereof.
  • Suitable enzymes include, but are not limited to, proteases, amylases, cellulases, lipases, carbohydrases, bleaching enzymes, cutinases, esterases, and wild-type enzymes.
  • Suitable surfactants include, but are not limited to, nonionic surfactants, anionic surfactants, cationic surfactants, ampholytic surfactants, zwitterionic surfactants, and mixtures thereof.
  • Suitable bleaching agents include, but are not limited to, common inorganic/organic chlorine bleach (e.g., sodium or potassium dichloroisocyanurate dihydrate, sodium hypochlorite, sodium hypochloride), hydrogen-peroxide releasing salt (such as, sodium perborate monohydrate (PB1), sodium perborate tetrahydrate (PB4)), sodium percarbonate, sodium peroxide, and mixtures thereof.
  • Suitable bleach-modifying materials include but are not limited to hydrogen peroxide-source bleach activators (e.g., TAED), bleach catalysts (e.g. transition containing cobalt and manganese).
  • Suitable carriers include, but are not limited to: water, low molecular weight organic solvents (e.g., primary alcohols, secondary alcohols, monohydric alcohols, polyols, and mixtures thereof), and mixtures thereof.
  • Suitable acids include, but are not limited to, acetic acid, aspartic acid, benzoic acid, boric acid, bromic acid, citric acid, formic acid, gluconic acid, glutamic acid, hydrochloric acid, lactic acid, malic acid, nitric acid, sulfamic acid, sulfuric acid, tartaric acid, and mixtures thereof.
  • Suitable corrosion inhibitors include, but are not limited to, soluble metal salts, insoluble metal salts, and mixtures thereof.
  • Suitable metal salts include, but are not limited to, aluminum, zinc (e.g., hydrozincite), magnesium, calcium, lanthanum, tin, gallium, strontium, titanium, and mixtures thereof.
  • Suitable aesthetic agents include, but are not limited to, opacifiers, dyes, pigments, color speckles, beads, brighteners, and mixtures thereof.
  • the cleaning formulations described herein can be useful as automatic dishwashing detergent (‘ADD’) compositions (e.g., builders, surfactants, enzymes, etc.), light-duty liquid dishwashing compositions, laundry compositions such as, compact and heavy-duty detergents (e.g., builders, surfactants, enzymes, etc.), rinse aid compositions (e.g., acids, nonionic low-foaming surfactants, carriers, etc.), and/or hard surface cleaning compositions (e.g., zwitterionic surfactants, germicides, etc.).
  • Cleaning formulations according to the present invention include both phosphate and zero-phosphate formulations.
  • Suitable adjunct ingredients are disclosed in one or more of the following: U.S. Pat. Nos. 2,798,053; 2,954,347; 2,954,347; 3,308,067; 3,314,891; 3,455,839; 3,629,121; 3,723,322; 3,803,285; 3,929,107, 3,929,678; 3,933,672; 4,133,779; 4,141,841; 4,228,042; 4,239,660; 4,260,529; 4,265,779; 4,374,035; 4,379,080; 4,412,934; 4,483,779; 4,483,780; 4,536,314; 4,539,130; 4,565,647; 4,597,898; 4,606,838; 4,634,551; 4,652,392; 4,671,891; 4,681,592; 4,681,695; 4,681,704; 4,686,063; 4,702,857; 4,968,451; 5,332,528
  • cleaning formulations according to the present invention can include from 0% to about 99.99% by weight of the formulation of a suitable adjunct ingredient. In another aspect, the cleaning formulations can include from about 0.01% to about 95% by weight of the formulation of a suitable adjunct ingredient.
  • the cleaning formulations can include from about 0.01% to about 90%, or from about 0.01% to about 80%, or from about 0.01% to about 70%, or from about 0.01% to about 60%, or from about 0.01% to about 50%, or from about 0.01% to about 40%, or from about 0.01% to about 30%, or from about 0.01% to about 20%, or from about 0.01% to about 10%, or from about 0.01% to about 5%, or from about 0.01% to about 4%, or from about 0.01% to about 3%, or from about 0.01% to about 2%, or from about 0.01% to about 1%, or from about 0.01% to about 0.5%, or alternatively from about 0.01% to about 0.1%, by weight of the formulation of a suitable adjunct ingredient.
  • Cleaning formulations can be provided in any suitable physical form. Examples of such forms include solids, granules, powders, liquids, pastes, creams, gels, liquid gels, and combinations thereof.
  • Cleaning formulations used herein include unitized doses in any of a variety of forms, such as tablets, multi-phase tablets, gel packs, capsules, multi-compartment capsules, water-soluble pouches or multi-compartment pouches.
  • Cleaning formulations can be dispensed from any suitable device. Suitable devices include, but are not limited to, wipes, hand mittens, boxes, baskets, bottles (e.g., pourable bottles, pump assisted bottles, squeeze bottles), multi-compartment bottles, jars, paste dispensers, and combinations thereof.
  • cleaning formulations can be provided in a multi-compartment, water-soluble pouch comprising both solid and liquid or gel components in unit dose form.
  • the use of different forms can allow for controlled release (e.g., delayed, sustained, triggered or slow release) of the cleaning formulation during treatment of a surface (e.g., during one or more wash and/or rinse cycles in an automatic dishwashing machine).
  • the pH of these formulations can range from 1 to 14 when the formulation is diluted to a 1% solution. Most formulations are neutral or basic, meaning in the pH range of 7 to about 13.5. However, certain formulations can be acidic, meaning a pH range from 1 to about 6.5.
  • Copolymers according to the present invention can also be used in a wide variety of cleaning formulations containing phosphate-based builders. These formulations can be in the form of a powder, liquid or unit doses such as tablets or capsules, and can be used to clean a variety of substrates such as clothes, dishes, and hard surfaces such as bathroom and kitchen surfaces. The formulations can also be used to clean surfaces in industrial and institutional cleaning applications.
  • the polymer can be diluted in the wash liquor to end use level.
  • the polymers are typically dosed at 0.01 to 1000 ppm in the aqueous wash solutions.
  • Optional components in detergent formulations include, but are not limited to, ion exchangers, alkalies, anticorrosion materials, anti-redeposition materials, optical brighteners, fragrances, dyes, fillers, chelating agents, enzymes, fabric whiteners and brighteners, sudsing control agents, solvents, hydrotropes, bleaching agents, bleach precursors, buffering agents, soil removal agents, soil release agents, fabric softening agent and opacifiers. These optional components can comprise up to about 90% by weight of the detergent formulation.
  • the polymers of this invention can be incorporated into hand dish, autodish and hard surface cleaning formulations.
  • the polymers can also be incorporated into rinse aid formulations used in autodish formulations.
  • Autodish formulations can contain builders such as phosphates and carbonates, bleaches and bleach activators, and silicates. These polymers can also be used in reduced phosphate formulations (i.e., less than 1500 ppm in the wash) and zero phosphate autodish formulations. In zero-phosphate autodish formulations, removal of the phosphates negatively affects cleaning, as phosphates provide sequestration and calcium carbonate inhibition.
  • Graft copolymers according to the present invention aid in sequestration and threshold inhibition, and therefore are suitable for use in zero-phosphate autodish formulations.
  • the above formulations can also include other ingredients such as enzymes, buffers, perfumes, anti-foam agents, processing aids, and so forth.
  • Hard surface cleaning formulations can contain other adjunct ingredients and carriers.
  • adjunct ingredients include, without limitation, buffers, builders, chelants, filler salts, dispersants, enzymes, enzyme boosters, perfumes, thickeners, clays, solvents, surfactants and mixtures thereof.
  • use levels can be about 0.01 weight % to about 10 weight % of the cleaning formulation. In another embodiment, use levels can range from about 0.1 weight % to about 2 weight % of the cleaning formulation.
  • Foulants are loose, porous, insoluble materials suspended in water. They can include such diverse substances as particulate matter scrubbed from the air, migrated corrosion products, silt, clays and sand suspended in the makeup water, organic contaminants (oils), biological matter, and extraneous materials such as leaves, twigs and wood fibers from cooling towers. Fouling can reduce heat transfer by interfering with the flow of cooling water. Additionally, fouling can reduce heat transfer efficiency by plugging heat exchangers. Low molecular weight graft copolymers according to the present invention are excellent dispersants for foulants, and can minimize their deleterious effects in water treatment applications.
  • Water treatment includes prevention of calcium scales due to precipitation of calcium salts such as calcium carbonate, calcium sulfate and calcium phosphate. These salts are inversely soluble, meaning that their solubility decreases as the temperature increases. For industrial applications where higher temperatures and higher concentrations of salts are present, this usually translates to precipitation occurring at the heat transfer surfaces. The precipitating salts can then deposit onto the surface, resulting in a layer of calcium scale. The calcium scale can lead to heat transfer loss in the system and cause overheating of production processes. This scaling can also promote localized corrosion.
  • calcium salts such as calcium carbonate, calcium sulfate and calcium phosphate.
  • Calcium phosphate unlike calcium carbonate, is generally not a naturally occurring problem.
  • orthophosphates are commonly added to industrial systems (and sometimes to municipal water systems) as a corrosion inhibitor for ferrous metals, typically at levels between 2.0-20.0 mg/L. Therefore, calcium phosphate precipitation can not only result in those scaling problems previously discussed, but can also result in severe corrosion problems as the orthophosphate is removed from solution.
  • industrial cooling systems require periodic maintenance wherein the system must be shut down, cleaned and the water replaced. Lengthening the time between maintenance shutdowns saves costs and is desirable.
  • One way to lengthen the time between maintenance in a water treatment system is to use polymers that function in either inhibiting formation of calcium salts or in modifying crystal growth.
  • Crystal growth modifying polymers alter the crystal morphology from regular structures (e.g., cubic) to irregular structures such as needlelike or florets. Because of the change in form, crystals that are deposited are easily removed from the surface simply by mechanical agitation resulting from water flowing past the surface.
  • Low molecular weight graft copolymers according to the present invention are particularly useful at inhibiting calcium phosphate based scale formation such as calcium orthophosphate. Further, these inventive copolymers also modify crystal growth of calcium carbonate scale.
  • Copolymers according to the present invention can be added to the aqueous systems neat, or they can be formulated into various water treatment compositions and then added to the aqueous systems.
  • the copolymers can be used at levels as low as 0.5 mg/L.
  • the upper limit on the amount of copolymer used depends upon the particular aqueous system treated. For example, when used to disperse particulate matter, the copolymer can be used at levels ranging from about 0.5 to about 2,000 mg/L.
  • the copolymer can be used at levels ranging from about 0.5 to about 100 mg/L. In another embodiment the copolymer can be used at levels from about 3 to about 20 mg/L, and in another embodiment from about 5 to about 10 mg/L.
  • the low molecular weight graft copolymers can be incorporated into an aqueous treatment composition that includes the graft copolymer and other aqueous treatment chemicals. These other chemicals can include, for example, corrosion inhibitors such as orthophosphates, zinc compounds and tolyltriazole.
  • the amount of inventive copolymer utilized in water treatment compositions can vary based upon the treatment level desired for the particular aqueous system treated. Water treatment compositions generally contain from about 0.001 to about 25% by weight of the low molecular weight graft copolymer. In another aspect, the copolymer is present in an amount of about 0.5% to about 5% by weight of the aqueous treatment composition.
  • Low molecular weight graft copolymers according to the present invention can be used in any aqueous system wherein stabilization of mineral salts is important, such as in heat transfer devices, boilers, secondary oil recovery wells, automatic dishwashers, and substrates that are washed with hard water.
  • These graft copolymers can stabilize many minerals found in water, including, but not limited to, iron, zinc, phosphonate, and manganese. These copolymers also disperse particulates found in aqueous systems.
  • Low molecular weight graft copolymers according to the present invention can be used to inhibit scales, stabilize minerals and disperse particulates in many types of processes.
  • processes include sugar mill anti-scalant, soil conditioning, treatment of water for use in industrial processes such as mining, oilfields, pulp and paper production, and other similar processes, waste water treatment, ground water remediation, water purification by processes such as reverse osmosis and desalination, air-washer systems, corrosion inhibition, boiler water treatment, as a biodispersant, and chemical cleaning of scale and corrosion deposits.
  • One skilled in the art can conceive of many other similar applications for which the low molecular weight graft copolymer could be useful.
  • Scale formation is a major problem in oilfield applications.
  • Subterranean oil recovery operations can involve the injection of an aqueous solution into the oil formation to help move the oil through the formation and to maintain the pressure in the reservoir as fluids are being removed.
  • the injected water either surface water (lake or river) or seawater (for operations offshore) can contain soluble salts such as sulfates and carbonates. These salts tend to be incompatible with ions already present in the oil-containing reservoir (formation water).
  • the formation water can contain high concentrations of certain ions that are encountered at much lower levels in normal surface water, such as strontium, barium, zinc and calcium.
  • partially soluble inorganic salts such as barium sulfate and calcium carbonate often precipitate from the production water. This is especially prevalent when incompatible waters are encountered such as formation water, seawater, or produced water.
  • Barium sulfate or other inorganic supersaturated salts such as strontium sulfate can precipitate onto the formation forming scale, thereby clogging the formation and restricting the recovery of oil from the reservoir. These salts can form very hard, insoluble scales that are difficult to prevent. The insoluble salts can also precipitate onto production tubing surfaces and associated extraction equipment, limiting productivity, production efficiency and compromising safety. Certain oil-containing formation waters are known to contain high barium concentrations of 400 ppm and higher. Since barium sulfate forms a particularly insoluble salt, the solubility of which declines rapidly with increasing temperature, it is difficult to inhibit scale formation and to prevent plugging of the oil formation and topside processes and safety equipment.
  • Dissolution of sulfate scales is difficult, requiring high pH, long contact times, heat and circulation, and therefore is typically performed topside. Alternatively, milling and, in some cases, high-pressure water washing can be used. These are expensive, invasive procedures and require process shutdown.
  • Use of low molecular weight graft copolymers according to the present invention can minimize these sulfate scales, especially downhole.
  • Biodegradability in oil field applications is typically measured by OECD 306b testing, which is conducted in sea water. If the test sample is found to be greater than 60% biodegradable in 28 days, it is termed to be ‘readily biodegradable’, and if it is found to be greater than 20% biodegradable in 28 days, it is termed to be ‘inherently biodegradable’. Graft copolymers typically derive their biodegradable profile from their hydroxyl-containing natural moiety.
  • graft copolymers according to the present invention can have at least about 20% by weight of hydroxyl-containing natural moiety, based on total weight of the graft copolymer. In another aspect, the graft copolymers have at least about 60% by weight. In order to be useful in oil field applications, performance of these graft copolymers should be similar to that of their synthetic counterparts, even with these high levels of hydroxyl-containing natural moieties.
  • Graft copolymers according to the present invention can be used in a number of oil field applications such as cementing, drilling mud, general dispersancy and spacer fluid applications. These applications are described in some detail below.
  • Water encountered in the oilfield can be very brackish. Often, the water encountered in oilfield applications is sea water or brines from the formation. Hence, useful polymers should be soluble in a variety of brines and brackish waters. Brines can be sea water containing, for example, about 3.5% by weight or more NaCl. Severe brines can contain, for example, up to 3.5% by weight KCl, up to 25% by weight NaCl, and/or up to 20% by weight CaCl 2 . Therefore, in order to be useful, polymers should be soluble in these systems for them to be effective, for example, as scale inhibitors. Typically, the higher the solubility of the graft copolymer in the brine, the higher its compatibility will be.
  • graft copolymers according to the present invention are soluble at about 5 to about 1000 ppm levels in sea water. In another aspect these graft copolymers are soluble up to about 10,000 ppm levels. In even another aspect these graft copolymers are soluble up to about 100,000 ppm levels.
  • graft copolymers according to the present invention are soluble at about 5 to about 1000 ppm levels in moderate calcium brine. In one aspect they are soluble up to about 10,000 ppm levels. In even another aspect they are soluble up to about 100,000 ppm levels.
  • graft copolymers according to the present invention are soluble at about 5 to about 1000 ppm levels in severe calcium brine. In one aspect they are soluble up to about 10,000 ppm levels. In another aspect they are soluble up to about 100,000 ppm levels.
  • a number of synthetic anionic polymers are not brine compatible.
  • graft copolymers according to the present invention are extremely brine compatible. Without limiting the present invention, it is believed that this is because the hydroxyl-containing natural moiety adds non-ionic character to the graft copolymers, thereby enhancing their compatibility in these brine systems.
  • Graft copolymers according to the present invention can have at least about 20% by weight of the hydroxyl-containing natural moiety, based on total weight of the graft copolymer. In another aspect, the copolymer can have at least about 60% by weight of the hydroxyl-containing natural moiety, based on total weight of the copolymer, for brine compatibility.
  • the pH of the system typically is 5 and higher.
  • the maleic acid constituent can be at least about 10 mole % of the synthetic component. In another aspect the maleic acid constituent is at least about 20 mole % of the synthetic component.
  • compositions of synthetic seawater, moderate and severe calcium brines, which are typical brines encountered in the oilfield are listed in Table 1 below.
  • a variety of procedures involving hydraulic cement compositions are utilized in the construction and repair of wells such as oil, gas and water wells.
  • a pipe such as casing is disposed in the well bore and a hydraulic cement composition is pumped into the annular space between the walls of the well bore and the exterior of the pipe.
  • the cement composition is allowed to set in the annular space whereby an annular cement sheath is formed therein which bonds the pipe to the walls of the well bore and prevents the undesirable flow of fluids into and through the annular space.
  • hydraulic cement compositions are often utilized to plug holes or cracks in the pipe disposed in the well bore. These compositions can be also used to plug holes, cracks, voids or channels in the aforementioned cement sheath between the pipe and the well bore, as well as to plug permeable zones or fractures in subterranean formations and the like. These holes or cracks are repaired by forcing hydraulic cement compositions thereinto, which then harden and form impermeable plugs.
  • Graft copolymers according to the present invention may be used as dispersants, set retarding, fluid loss or gas migration prevention additives in these cementing applications.
  • the graft copolymers are made from anionic monomers containing carboxylic acid or phosphonic acid groups. Additionally, non-ionic monomers may be used to improve or enhance performance.
  • Set retarded hydraulic cement compositions of this invention include hydraulic cement, sufficient water to form a slurry of the cement, and a copolymer set-retarding additive as described above.
  • Various hydraulic cements can be utilized in the cement compositions, for example, Portland cement, and can be, for example, one or more of the various types identified as API Classes A-H and J cements. These cements are classified and defined in API Specification for Materials and Testing for Well Cements, API Specification 10A, 21st Edition dated Sep. 1, 1991, of the American Petroleum Institute, Washington, D.C.
  • API Portland cement generally has a maximum particle size of about 90 microns and a specific surface (sometimes referred to as Blaine Fineness) of about 3900 square centimeters per gram.
  • One embodiment of a cement slurry base for use in accordance with this invention includes API Class H Portland cement mixed with water to provide a density of from about 11.3 to about 18.0 pounds per gallon.
  • fine particle size hydraulic cement is utilized.
  • Such cement can include, for example, particles having diameters no larger than about 30 microns (‘ ⁇ m’) and Blaine Fineness no less than about 6000 square centimeters per gram.
  • the fine cement particles have diameters no larger than about 17 ⁇ m.
  • the particles are no larger than about 11 ⁇ m.
  • the Blaine Fineness is greater than about 7000 square centimeters per gram.
  • the Blaine Fineness is greater than about 10,000 square centimeters per gram. In even another aspect it is greater than about 13,000 square centimeters per gram.
  • Water used in cement compositions of this invention can be water from any source provided that it does not contain an excess of compounds which adversely react with or otherwise affect other components in the cement compositions.
  • Water is present in a cement composition of this invention in an amount sufficient to form a slurry of the cement, such as a slurry that is readily pumpable. Generally, water is present in an amount of from about 30% to about 60% by weight of dry cement in the composition when the cement is of normal particle size. When a cement of fine particle size as described above is used, water is present in the cement composition in an amount of from about 100% to about 200% by weight of dry cement in the composition.
  • a dispersing agent such as one described in U.S. Pat. No. 4,557,763 is generally included to facilitate formation of the cement slurry and prevent the premature gelation thereof.
  • Graft copolymers according to the present invention can be included in cement compositions in amounts sufficient to delay or retard setting of the compositions for time periods required to place the compositions in desired locations.
  • the cement compositions When the cement compositions are utilized to carry out completion, remedial and other cementing operations in subterranean zones penetrated by well bores, the compositions must remain pumpable for periods of time long enough to place them in the subterranean zones to be cemented. Thickening and set times of cement compositions can be dependent upon temperature.
  • a quantity of a copolymer set retarding additive according to the present invention is included in the cement composition so as to provide the necessary pumping time at the temperature encountered downhole. Such quantity can be determined in advance by performing thickening time tests of the type described in the above mentioned API Specification 10A.
  • an aqueous solution containing a set retarding copolymer of this invention which is about 40% active is combined with a cement slurry.
  • the copolymer is present in the resulting set retarded cement composition in an amount of from about 0.01% to about 5.0% by weight of dry cement in the composition.
  • additives are often included in well cement compositions.
  • Such other additives are well known to those skilled in the art and are added to well cement compositions to vary composition density, increase or decrease strength, control fluid loss, reduce viscosity, increase resistance to corrosive fluids, and the like.
  • a cement composition meeting the specifications of the American Petroleum Institute is mixed with water and other additives to provide a cement slurry appropriate for the conditions existing in each individual well to be cemented.
  • the methods of this invention for cementing a subterranean zone penetrated by a well bore are basically comprised of the steps of forming a pumpable set retarded cement composition of this invention, pumping the cement composition into the subterranean zone by way of the well bore, and then allowing the cement composition to set therein.
  • a drilling fluid is circulated through the string of drill pipe, through the drill bit and upwardly to the earth's surface through the annulus formed between the drill pipe and the surface of the well bore, thereby cooling the drill bit, lubricating the drill string and removing cuttings from the well bore.
  • another “performance” fluid such as slurry containing a cement composition is pumped into the annular space between the walls of the well bore and pipe string or casing.
  • primary cementing the cement composition sets in the annulus, supporting and positioning the casing, and forming a substantially impermeable barrier or cement sheath that isolates the casing from subterranean zones.
  • a spacer fluid is a fluid used to displace a performance fluid such as a drilling fluid in a well bore before introduction into the well bore of another performance fluid, such as a cement slurry.
  • Spacer fluids are often used in oil and gas wells to facilitate improved displacement efficiency when pumping new fluids into the well bore. Spacer fluids are also used to enhance solids removal during drilling operations, to enhance displacement efficiency and to physically separate chemically incompatible fluids. For instance, in primary cementing, the cement slurry is separated from the drilling fluid and partially dehydrated gelled drilling fluid may be removed from the walls of the well bore by a spacer fluid pumped between the drilling fluid and the cement slurry. Spacer fluids may also be placed between different drilling fluids during drilling fluid change outs or between a drilling fluid and a completion brine.
  • the present invention provides improved spacer fluids that can be interposed between the drilling fluid in the wellbore and either a cement slurry or a drilling fluid which has been converted to a cementitious slurry.
  • the spacer fluid serves as a buffer between the drilling fluid and the cement slurry, as well as a flushing agent for evacuating the drilling fluid from the wellbore, thereby resulting in improved displacement efficiency of the drilling fluid removal and improved bonding of the cementitious slurry to surfaces in the wellbore such as the casing or drillpipe wall surfaces.
  • the spacer fluid of the present invention comprises a graft copolymer dispersant and one or more additional components selected from surfactants, viscosifiers and weighting materials to form a theologically compatible fluid between the drilling fluid and the cementitious slurry.
  • the present invention also provides a method of using the spacer fluid.
  • a spacer fluid having a graft copolymer dispersant is introduced into the wellbore, and a completion fluid, such as cement slurry, is introduced to displace the spacer fluid.
  • drilling fluids Any fluids used in a well bore during drilling operations may be termed a drilling fluids.
  • the term is generally restricted to those fluids that are circulated in the bore hole in rotary drilling.
  • the rotary system of drilling requires the circulation of a drilling fluid in order to remove the drilled cuttings from the bottom of the hole and thus keep the bit and the bottom of the hole clean.
  • Drilling fluids are usually pumped from the surface down through a hollow drill pipe to the bit and the bottom of the hole and returned to the surface through the annular space outside the drill pipe. Any caving from the formations already drilled and exposed in the bore hole must be raised to the surface together with the drill cuttings by mud circulation.
  • the casings and larger drill cuttings are separated from the mud at the surface by flowing the mud through a moving screen of a shale shaker and then settling in mud pits.
  • the flowing drilling fluid cools the bit and the bottom of the hole.
  • the mud usually offers some degree of lubrication between the drill pipe and the wall of the hole. Flows of oil, gas and brines into the well bore are commonly prevented by overbalancing or exceeding formation pressures with the hydrostatic pressure of the mud column.
  • drilling mud One function of drilling mud is the maintenance and preservation of the hole already drilled.
  • the drilling fluid should permit identification of drill cuttings and identification of any shows of oil or gas in the cuttings. It should also allow for the use of the desired logging materials and other well completion practices. Finally, the drilling fluid should not impair the permeability of any oil or gas bearing formations penetrated by the well.
  • drilling fluids are drilling mud, which are suspensions of solids in liquids or in liquid emulsions.
  • the densities of such systems are adjusted to between about 7 and about 21 lbs/gal, or about 0.85 to about 2.5 specific gravity. Where water is used as the liquid phase, the lower limit of the density is about 8.6 to about 9 lbs/gal.
  • Filtration quality may be controlled by having a portion of the solids consist of particles of such small size and nature that very little of the liquid phase will escape through the filter cake of solids formed around the bore hole.
  • Control over viscosity and gel forming character of such suspensions is achieved within limits by the amount and kind of solids in the suspension and by the use of chemicals for reducing the internal resistance of such suspensions so that they will flow easily and smoothly.
  • the vast majority of drilling mud is suspension of clays and other solids in water, and is referred to as water based mud.
  • Oil based mud is suspensions of solids in oil. High flash point diesel oils are commonly used in the liquids phase and the finely dispersed solid is obtained by adding oxidized asphalt. Common weighting agents are used to increase the density. Viscosity and thixotropic properties are controlled by surfactants and other chemicals. Oil based mud is used for special purposes such as preventing the caving of certain shale, as well as completion mud for drilling into sensitive sands that would be damaged by water.
  • Water based mud includes a liquid phase, water and emulsion, a colloidal phase (e.g., clays), an inert phase (e.g., barite weight material and fine sand), and a chemical phase consisting of ions and substances in solution, which influence and control the behavior of colloidal materials such as clays.
  • a colloidal phase e.g., clays
  • an inert phase e.g., barite weight material and fine sand
  • a chemical phase consisting of ions and substances in solution, which influence and control the behavior of colloidal materials such as clays.
  • Colloidal materials produce higher viscosities in a mud for removing cuttings and caving from the hole and for suspending the inert materials such as finely ground barite.
  • An example of one such material is bentonite, which is a rock deposit.
  • the desirable material in the rock is montmorillonite.
  • these clays produce mud that has low filtration loss.
  • Special clays are used in mud saturated with salt water (e.g., attapulgite).
  • Starch and sodium carboxymethyl cellulose are used as auxiliary colloids for supplementing the mud properties produced by the clays.
  • Inert solids in drilling mud include silica, quartz and other inert mineral grains. These inert materials are finely ground weight material and lost circulation material.
  • a commonly used weight material is barite, which has a specific gravity of 4.3. Barite is a soft mineral and therefore minimizes abrasion on the pump valves and cylinders. It is insoluble and relatively inexpensive and therefore is widely used.
  • Lost circulation materials are added to the mud when losses of whole mud occur in crevices or cracks in exposed rocks in the well bore. Commonly used loss circulation materials include shredded cellophane flakes, mica flakes, cane fibers, wood fibers, ground walnut shells and perlite.
  • the chemical phase of water based mud controls the colloidal phase particularly in the case of bentonite type clays.
  • the chemical phase includes soluble salts which enter the mud from the drill cuttings and the disintegrated portions of the hole and those present in the make up water added to the mud.
  • the chemical phase also includes soluble treating chemicals for reducing viscosity and gel strength of the mud. These chemicals include inorganic materials such as caustic soda, lime, bicarbonate of soda and soda ash. Phosphates such as sodium tetraphosphate may be used to reduce mud viscosities and gel strengths.
  • the mud system contains calcium sulfate, a fluid loss reducing agent such as sodium carboxymethyl cellulose, and suitable surfactants.
  • surfactants include a primary surfactant for controlling the rheological properties (viscosity and gelation) of the mud, a defoamer and an emulsifier.
  • Perforation of earthen formations in order to tap subterranean deposits such as gas or oil is accomplished by well drilling tools and a drilling fluid.
  • These rotary drilling systems consist of a drilling bit fitted with appropriate ‘teeth’, a set of pipes assembled rigidly together end to end, wherein the diameter of the piping is smaller than that of the drilling bit.
  • This whole rigid piece of equipment—drill bit and drill pipe string— is driven into rotation from a platform situated above the well.
  • the crushed mineral materials must be cleared away from the bottom of the hole to enable the drilling operation to continue.
  • Aqueous clay dispersion drilling fluids are recirculated down through the hollow pipe, across the face of the drill bit, and upward through the hole.
  • the drilling fluid cools and lubricates the drill bit, raises the drilling cuttings to the surface of the ground, and seals the sides of the well to prevent loss of water and drilling fluids into the formation through which the drill hole is being bored.
  • the mud is passed through a settling tank or trough where sand and drill cuttings are separated, with or without screening.
  • the fluid is then pumped again into the drill pipe by a mud pump.
  • Copolymers according to the present invention can be used for scale inhibition where the scale inhibited is, for example, calcium carbonate, halite, calcium sulfate, barium sulfate, strontium sulfate, iron sulfide, lead sulfide and zinc sulfide and mixtures thereof.
  • the scale inhibited is, for example, calcium carbonate, halite, calcium sulfate, barium sulfate, strontium sulfate, iron sulfide, lead sulfide and zinc sulfide and mixtures thereof.
  • Halite is the mineral form of sodium chloride, commonly known as rock salt.
  • the copolymers can have greater than 80% inhibition to be effective under practical end use conditions. In one aspect, the copolymers can have greater than 90% inhibition.
  • the amount of copolymer needed to perform at this level depends on the scale to be inhibited. For example, calcium carbonate inhibitors can be be dosed at less than about 50 ppm. In one aspect, calcium carbonate inhibitors can be be dosed at less than about 20 ppm. In even another aspect, calcium carbonate inhibitors can be be dosed at less than about 10 ppm. Barium sulfate inhibitors can be dosed at, for example, less than about 100 ppm.
  • barium sulfate inhibitors can be dosed at less than about 20 ppm. In even another aspect, barium sulfate inhibitors can be dosed at less than about 10 ppm. It is also a major advantage to have the same polymer inhibit more than one type of scale, such as combination of calcium carbonate and barium sulfate, or calcium carbonate and calcium phosphate, at less than about 100 ppm, or, in another aspect, less than 50 ppm.
  • Copolymers of this invention can have to a number average molecular weight of less than 100,000. In another aspect, they can have a number average molecular weight of less than 10,000, and, in even another aspect, less than 5,000.
  • Scaling not only causes a restriction in pore size in the reservoir rock formation matrix (also known as ‘formation damage’), thereby reducing the rate of oil and/or gas production, but also blockage of tubular and pipe equipment during surface processing.
  • a method of inhibiting scaling in an aqueous system This is accomplished by adding a graft copolymer according to the present invention to the aqueous system.
  • the scale inhibitor can be injected, squeezed (as described later on), or added topside to the produced water.
  • the invention is also directed towards a mixture of the graft copolymer and a carrier fluid.
  • carrier fluid include water, glycol, alcohol or oil.
  • the carrier fluid is water, brines or methanol. Methanol is often used to prevent formation of water methane ice structures downhole.
  • the graft copolymers of this invention are soluble in methanol.
  • the scale inhibiting polymers can be introduced into the well bore in the methanol line. This is particularly advantageous when there is fixed number of lines that run into the wellbore, thereby eliminating the need for another line.
  • Graft copolymers of this invention can have at least about 10% by weight saccharide functionality, based on total weight of the copolymer, to be soluble in methanol. In another aspect the graft copolymers have at least about 20% by weight saccharide functionality.
  • aqueous systems include cooling water systems, water flood systems, and produced water systems.
  • the aqueous environment may also be in crude oil systems or gas systems, and may be deployed downhole, topside, pipeline or during refining.
  • the aqueous system may include CO 2 , H 2 S, O 2 , brine, condensed water, crude oil, gas condensate, or any combination of the said or other species.
  • Copolymers of this invention may be deployed continuously or intermittently in a batch-wise manner into the aqueous system.
  • copolymers according to the present invention are added topside and/or in a squeeze treatment.
  • a squeeze treatment also called a “shut-in” treatment
  • the scale inhibitor is injected into the production well, usually under pressure, “squeezed” into the formation, and held there.
  • the scale inhibitor is injected several feet radially into the production well, where it is retained by adsorption and/or formation of a sparingly soluble precipitate.
  • the inhibitor slowly leaches into the produced water over a period of time and protects the well from scale deposition.
  • the “shut-in” treatment needs to be done regularly (e.g., one or more times a year) if high production rates are to be maintained.
  • the treatment constitutes the “down time” when no production takes place.
  • Copolymers of this invention are particularly good for this type of squeeze scale inhibition due to their saccharide functionality, which can be absorbed onto the formation and released over time.
  • Polymers according to the present invention can be used as a dispersant for minerals in applications such as paper coatings, paints and other coating applications. These particulates are found in a variety of applications, including but not limited to, paints, coatings, plastics, rubbers, filtration products, cosmetics, food and paper coatings.
  • minerals that can be dispersed by the inventive polymers include titanium dioxide, kaolin clays, modified kaolin clays, calcium carbonates and synthetic calcium carbonates, iron oxides, carbon black, talc, mica, silica, silicates, and aluminum oxide.
  • the more hydrophobic the mineral the better polymers according to the present invention perform in dispersing particulates.
  • the low molecular weight graft copolymer can be used as a binder for fiberglass.
  • Fiberglass insulation products are generally formed by bonding glass fibers together with a synthetic polymeric binder.
  • Fiberglass is usually sized with phenol-formaldehyde resins or polyacrylic acid based resins.
  • the former has the disadvantage of releasing formaldehyde during end use.
  • the polyacrylic acid resin system has become uneconomical due to rising crude oil prices. Hence, there is a need for renewal sizing materials in this industry.
  • the low molecular weight graft polymers of this invention are a good fit for this application. They can be used by themselves or in conjunction with the with the phenol formaldehyde or polyacrylic acid binder system.
  • the binder composition is generally applied by means of a suitable spray applicator to a fiber glass mat as it is being formed or soon after it is formed and while it is still hot.
  • the spray applicator aids in distributing the binder solution evenly throughout the formed fiberglass mat.
  • the polymeric binder solution tends to accumulate at the junctions where fibers cross each other, thereby holding the fibers together at these junctions.
  • Solids are typically present in the aqueous solution in amounts of about 5 to 25 percent by weight of total solution.
  • the binder can also be applied by other means known in the art, including, but not limited to, airless spray, air spray, padding, saturating, and roll coating.
  • the resultant high-solids binder-coated fiberglass mat is allowed to expand vertically due to the resiliency of the glass fibers.
  • the fiberglass mat is then heated to cure the binder.
  • curing ovens operate at a temperature of from 130° C. to 325° C.
  • the binder composition of the present invention can be cured at lower temperatures of from about 110° C. to about 150° C.
  • the binder composition can be cured at about 120° C.
  • the fiberglass mat is typically cured from about 5 seconds to about 15 minutes. In one aspect the fiberglass mat is cured from about 30 seconds to about 3 minutes.
  • the cure temperature and cure time also depend on both the temperature and level of catalyst used.
  • the fiberglass mat can then be compressed for shipping.
  • An important property of the fiberglass mat is that it returns substantially to its full vertical height once the compression is removed.
  • the low molecular weight graft polymer based binder produces a flexible film that allows the fiberglass insulation to bounce back after a roll is unwrapped for use in walls/ceilings.
  • Fiberglass or other non-wovens treated with the copolymer binder composition is useful as insulation for heat or sound in the form of rolls or batts; as a reinforcing mat for roofing and flooring products, ceiling tiles, flooring tiles, as a microglass-based substrate for printed circuit boards and battery separators; for filter stock and tape stock and for reinforcements in both non-cementatious and cementations masonry coatings.
  • the present invention provides a process for making graft copolymers at a lighter color.
  • the graft copolymers are made using a redox system of a metal ion and hydrogen peroxide.
  • the graft copolymers are made using free radical initiating systems such as ceric ammonium nitrate and Fe (II)/H 2 O 2 (see, Würzburg, O. B., M ODIFIED S TARCHES: P ROPERTIES AND U SES, Grafted Starches, Chpt. 10, pp. 149-72, CRC Press, Boca Raton (1986)).
  • Fe (II) can be substituted with other metal ions such as Cu (II), Co (III), Mn (III) and others. Of these ions, Cu (II) appears to be the most effective and gives low molecular weight products.
  • the amount of metal ions required depends on the metal ion used, the amount of H 2 O 2 used, the monomers to be grafted and the relative amount of natural component to synthetic monomer.
  • the amount of metal ion needed can exceed 10, and in some cases 100, ppm based on moles of monomer, which is much higher than the 1 to 2 ppm typically used.
  • the amount of metal ion can be given in terms of ppm as moles of the metal ion per total moles of monomer. For example, in the case of Fe (II), 10 ppm or greater moles of Fe based on moles of monomers can be used.
  • 100 ppm or greater moles of Fe based on moles of monomers can be used.
  • Cu (II) 1 ppm or greater moles of Cu based on moles of monomers can be used.
  • 10 ppm or greater moles of Cu based on moles of monomers can be used.
  • 100 ppm or greater moles of Cu based on moles of monomers can be used.
  • Higher amounts of metal ion are needed when lower amount of H 2 O 2 are used.
  • higher levels of the metal ion are needed when the amount of the natural component is high, for example, about 50 weight percent or greater of the total weight of natural component and synthetic monomer.
  • the Cu (II) system is more effective than Fe (II) systems at lowering molecular weight (see, e.g., Examples 2 and 3).
  • low molecular weight graft copolymers are produced having a Gardner color of 12 or less.
  • polymerization is carried out at acidic pH, and Fe(II) and hydrogen peroxide are typically used as the initiating system.
  • copper salts can be used instead of iron to produce lower color materials.
  • lower feed times are used to produce products with low color. For example, comonomers like acrylic acid are fed in over a period of 5 to 6 hours to react with the sluggish maleic acid. Lowering the feed times to 3 to 4 hours and using Cu (II) salts such as copper sulfate lowers the color.
  • polymerization occurs at low pH. In one aspect, polymerization occurs at a pH of about 6 or below. In another aspect, polymerization occurs at a pH of about 5 or below. In even another aspect, polymerization occurs at a pH of about 3 or below.
  • Monomers such as maleic acid are sluggish in polymerization reactions. They need a certain amount of neutralization to react. They are typically added to the initial charge and neutralized at the same time. This leads to very dark colored materials. It is better to add the maleic in the initial charge. However, the maleic should not be completely neutralized in the initial charge. Caustic needs to be added slowly during the reaction so that the polymerization reaction is carried out under acidic pH conditions. Part of the neutralization agent may be added to the initial charge and the rest may be added in a feed. Alternatively, the maleic acid may be co-fed along with the neutralizing agent such as NaOH. Also, most of the products are neutralized at the end of the reaction. They need to be neutralized to below 6 to maintain a low color.
  • the neutralizing agent such as NaOH
  • reaction temperature ranges at ambient pressure can be about 40° C. to 130° C. In another aspect, the temperature range is 80° C. to 100° C. Higher temperatures can be used when the reaction (which is usually in an aqueous medium) occurs at pressures above ambient.
  • Molecular weights of all the graft copolymers in the Examples below were determined by aqueous Gel Permeation Chromatography (‘GPC’) using a series of polyacrylic acid standards.
  • the method uses 0.05M sodium phosphate (0.025M NaH 2 PO 4 and 0.025M Na 2 HPO 4 ) buffered at pH 7/0 with NaN 3 as the mobile phase.
  • the columns used in this method are: TSKgel PWx1 Guard column, TSKgel; G6000PWx1, G4000PWx1, G3000PWx1, G2500PWx1 set at a temperature of 32° C.
  • Flow rate is 1 mL per minute, and the injection volume is 450 ⁇ L.
  • the instrument is calibrated using five different polyacrylic acids standards injected at five different concentrations: PAA1K (2.0 mg/mL), PAA5K (1.75 mg/mL), PAA85K (1.25 mg/mL), PAA495K (0.75 mg/mL), and PAA1700K (0.2 mg/mL), all from American Polymer Standards Corporation.
  • Molecular weight of starting polysaccharides in the Examples below was determined by aqueous Gel Permeation Chromatography (GPC) using a series of hydroxyl ethyl starch standards.
  • the method uses 0.05M sodium phosphate (0.025M NaH 2 PO 4 and 0.025M Na 2 HPO 4 ) buffered at pH 7/0 with NaN 3 as the mobile phase.
  • the columns used in this method are: TSKgel PWx1 Guard column, TSKgel; G6000PWx1, G4000PWx1, G3000PWx1, and G2500PWx1 set at a temperature of 32° C.
  • the flow rate is 1 mL/min and injection volume is 450 ⁇ L.
  • the instrument is calibrated using five different hydroxyethyl starch standards injected at five different concentrations: HETA10K (2.0 mg/mL), HETA17K (1.75 mg/mL), HETA40K (1.25 mg/mL), HETA95K (0.75 mg/mL), and HETA205K (0.2 mg/mL), all from American Polymer Standards Corporation.
  • maltodextrin Cargill MDTM 01960 dextrin, having a DE of 11 and a number average molecular weight of 14,851 as determined by aqueous GPC described above
  • FAS ferrous ammonium sulfate
  • An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized to a pH of 5 by adding 18 grams of a 50% solution of NaOH. The final product was a clear water white solution having a Gardner color of 1. The number average molecular weight of this polymer was 159,587 as determined by aqueous GPC process noted above.
  • the polymer was then neutralized to a pH of 5 by adding 18 grams of a 50% solution of NaOH.
  • the final product was a clear water white solution having a Gardner color of 1.
  • the number average molecular weight of this polymer was 101,340 as determined by aqueous GPC process noted above.
  • the copolymer in Comparative Example 2 above was reproduced in the same manner with the exception that instead of 0.00075 grams of FAS, 0.075 grams of FAS was used (100 times the level of FAS used in Comparative Example 1, or 0.19 mmoles of FAS and 400 ppm as moles of Fe based on moles of acrylic acid monomer).
  • the final product was a dark amber solution having a Gardner color of 12.
  • the number average molecular weight of this polymer was 5,265 as determined by aqueous GPC.
  • This example illustrates that higher levels of Fe(II) (400 ppm instead of 4) are required to lower the molecular weight compared to Comparative Example 1. However, this leads to darker colored materials as evidenced by the significant jump in Gardner color from 1 to 12.
  • the copolymer in Comparative Example 1 above was reproduced in the same manner with the exception that instead of 0.00075 grams of FAS, 0.75 grams of FAS was used (1,000 times the level of FAS used in Comparative Example 1, or 1.9 mmoles FAS and 4000 ppm as moles of Fe based on moles of acrylic acid monomer).
  • the final product was a very dark amber solution having a Gardner color of 18.
  • the number average molecular weight of this polymer was 5,380 as determined by aqueous GPC. (This Mn is within experimental error and may indicate a limit of how low a Mn can be reached with increasing levels of Fe.)
  • the copolymer in Comparative Example 1 above was reproduced in the same manner with the exception that instead of 0.00075 grams of FAS, 0.048 grams of Cu (II) sulfate pentahydrate was used (0.19 mmoles Cu (II) sulfate pentahydrate and 400 ppm as moles of Cu based on moles of acrylic acid monomer, or the same amount of Cu used as Fe used in Example 1).
  • the final product was a clear yellow solution having a Gardner color of 9.
  • the number average molecular weight of this polymer was 3,205 as determined by aqueous GPC. This shows that using Cu instead of Fe produces a lower molecular weight copolymer.
  • an acceptable yellow color (Gardner 9 instead of 12), which is much lighter than the dark amber color of Example 1, is obtained by using the Cu salt instead of Fe and neutralizing to a pH of about 5.
  • the copolymer in Comparative Example 2 above was reproduced in the same manner with the exception that instead of 0.00075 grams of FAS, 0.0022 grams of Cu (II) sulfate pentahydrate was used (0.0088 mmoles Cu (II) sulfate pentahydrate, which is the same molar level as the FAS used in Comparative Example 2).
  • the final product was a dark amber solution having a Gardner color of 11.
  • the number average molecular weight of this polymer was 4,865 as determined by aqueous GPC. This shows that using Cu instead of Fe produces a lower molecular weight copolymer.
  • a solution containing 140 grams of acrylic acid (1.94 moles) and 141.9 grams of water was added to the reactor over a period of 5 hours. The amount of natural component was 50 weight % of total natural component and synthetic monomers.
  • An initiator solution comprising 75 grams of 35% hydrogen peroxide and 25 grams of sodium persulfate dissolved in 80 grams of deionized water was simultaneously added to the reactor over a period of 6 hours. Simultaneously, 75 grams of 50% NaOH dissolved in 100 grams of water was added over 6 hours and 15 minutes so that the maleic acid is partially neutralized during the polymerization process. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 70 grams of a 50% solution of NaOH. The final product was a very dark amber solution with a Gardner color of 17 and a pH of 4.6. The number average molecular weight of this polymer was 1,360 as determined by aqueous GPC. The residual acrylic acid was 546 ppm and the residual maleic acid was 252 ppm.
  • An initiator solution comprising 75 grams of 35% hydrogen peroxide and 25 grams of sodium persulfate dissolved in 80 grams of deionized water was simultaneously added to the reactor over a period of 6 hours. Simultaneously, 75 grams of 50% NaOH dissolved in 100 grams of water was added over 6 hours and 15 minutes partially neutralizing the maleic acid during the polymerization process. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 70 grams of a 50% solution of NaOH. The final product was a very dark amber solution having a Gardner color of 18 and a pH of 4.6. The number average molecular weight of this polymer was 1,340 as determined by aqueous GPC. The residual acrylic acid was 588 ppm and the residual maleic acid was 460 ppm.
  • a reactor containing 120 grams of water and 94 grams of Cargill Sweet Satin Maltose (80% solution) and 0.048 grams of Cu(II) sulfate pentahydrate (0.19 mmoles, of 553 ppm as moles of Cu based on moles of acrylic acid monomer) was heated to 98° C.
  • a solution containing 25 grams of acrylic acid (0.347 moles) and 30 grams of water was added to the reactor over a period of 45 minutes.
  • An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour.
  • the polymer was then neutralized by adding 18 grams of a 50% solution of NaOH (0.225 moles) for a 65% neutralization of the acrylic acid groups.
  • the final product was a clear golden yellow solution with a Gardner color of 7 and a pH of 5.1.
  • the number average molecular weight of this polymer was 2,024 as determined by aqueous GPC.
  • the polymer solution was stable for months with no signs of phase separation.
  • a reactor containing 120 grams of water and 106 grams of Cargill Sweet Satin Maltose (80% solution) and 0.048 grams of Cu(II) sulfate pentahydrate (0.19 mmoles, or 923 ppm as moles of Cu based on the moles of acrylic acid monomer) was heated to 98° C.
  • a solution containing 15 grams of acrylic acid (0.208 moles) and 30 grams of water was added to the reactor over a period of 45 minutes.
  • An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour.
  • the polymer was then neutralized by adding 7.5 grams of a 50% solution of NaOH (0.09 moles) for a 45% neutralization of the acrylic acid groups.
  • the final product was a clear golden yellow solution with a Gardner color of 7 and a pH of 4.9.
  • the number average molecular weight of this polymer was 1,255 as determined by aqueous GPC.
  • the polymer solution was stable for months with no signs of phase separation.
  • a reactor containing 120 grams of water, 119 grams of Cargill Sweet Satin Maltose (80% solution) and 0.048 grams of Cu(II) sulfate pentahydrate (0.19 mmoles Cu(II) sulfate pentahydrate, or 2736 ppm as moles of Cu based on moles of acrylic acid monomer) was heated to 98° C.
  • a solution containing 5 grams of acrylic acid (0.069 moles) and 30 grams of water was added to the reactor over a period of 45 minutes.
  • An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour.
  • the polymer was then neutralized by adding 2.5 grams of a 50% solution of NaOH (0.031 moles) for a 45% neutralization of the acrylic acid groups.
  • the final product was a clear golden yellow solution having a Gardner color of 7 and a pH of 4.9.
  • the number average molecular weight of this polymer was below the detectable limit of the GPC.
  • the polymer solution was stable for months with no signs of phase separation.
  • a solution containing 140 grams of acrylic acid (1.94 moles) was added to the reactor over a period of 5 hours. The amount of natural component was 50 weight percent of the natural component and the synthetic monomers.
  • An initiator solution comprising 75 grams of 35% hydrogen peroxide and 25 grams of sodium persulfate dissolved in 80 grams of deionized water was simultaneously added to the reactor over a period of 6 hours.
  • the reaction product was held at 98° C. for an additional hour.
  • the polymer was then neutralized by adding 70 grams of a 50% solution of NaOH.
  • the fmal product was a very dark amber solution with a Gardner color of 15.
  • the number average molecular weight of this polymer was 4,038 as determined by aqueous GPC.
  • An initiator solution comprising of 4.7 grams of sodium persulfate and 38.7 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water was added to the reactor at the same time and over the same period as the monomer solution.
  • the reaction product was held at 95° C. for 30 minutes.
  • 0.3 grams of erythorbic acid dissolved in 0.6 grams of water and 4 grams of a 41% bisulfite solution were simultaneously added to scavenge the residual monomer.
  • the final product was a clear light amber solution and had 44% solids.
  • An initiator solution comprising of 4.8 grams of sodium persulfate and 38.7 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water was added to the reactor over a period of 5.5 hours. The reaction product was held at 95° C. for 30 minutes. 0.3 grams of erythorbic acid dissolved in 0.6 grams of water and simultaneously, 4 grams of a 41% bisulfite solution was added to scavenge the residual monomer. The final product was a clear light amber solution and had 35% solids. The number average molecular weight of this polymer as measured by aqueous GPC was 1755.
  • An initiator solution comprising of 2.4 grams of sodium persulfate and 19.4 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water was added to the reactor over a period of 5.5 hours. The reaction product was held at 95° C. for 30 minutes. 0.3 grams of erythorbic acid dissolved in 0.6 grams of water and simultaneously, 4 grams of a 41% bisulfite solution was added to scavenge the residual monomer. The final product was a clear light amber solution and had 44% solids. The number average molecular weight of this polymer as measured by aqueous GPC was 1280.
  • Copolymers from the above Examples were tested for anti-redeposition properties in a generic powdered detergent formulation.
  • the powdered detergent formulation was as follows:
  • the test was conducted in a full scale washing machine using 3 cotton and 3 polyester/cotton swatches. Soil consisting of 17.5 g rose clays 17.5 g bandy black clay and 6.9 g oil blend (75:25 vegetable/mineral) was used. The test was conducted for 3 cycles using 100 g powder detergent per wash load. The polymers were dosed in at 1.0 wt % of the detergent. The wash conditions used were temperature of 33.9° C. (93° F.), 150 ppm hardness and a 10 minute wash cycle.
  • Delta whiteness index is calculated using the L, a, b values above.
  • Example 18 Example 19 Ingredient Wt % Wt % Wt % Anionic surfactant 22 20 10.6 Non-ionic surfactant 1.5 1.1 9.4 Cationic surfactant — 0.7 — Zeolite 28 — 24 Phosphate — 25 — Silicate 8.5 Sodium 27 14 9 carbonate/bicarbonate Sulfate 5.4 15 11 Sodium silicate 0.6 10 — Polyamine 4.3 1.9 5 Brighteners 0.2 0.2 — Sodium perborate 1 Sodium percarbonate 1 — — Sodium hypochlorite 1 Suds suppressor 0.5 0.5 — Bleach catalyst 0.5 — Polymer of Example 1 1 Polymer of Example 2 5 Polymer of Example 3 2 Water and others Balance Balance Balance Balance
  • Citric acid 50% solution
  • Phosphoric acid 1.0 C 12 -C 15 linear alcohol ethoxylate with 3 moles of EO 5.0 Alkyl benzene sulfonic acid 3.0
  • Polymer of Example 1 1.0 Water 78.0
  • water-soluble polymers are incorporated into a water treatment composition that includes the water-soluble polymer and other water treatment chemicals.
  • Other water treatment chemicals include corrosion inhibitors such as orthophosphates, zinc compounds and tolyl triazole.
  • the level of inventive polymer utilized in water treatment compositions is determined by the treatment level desired for the particular aqueous system treated.
  • Water soluble polymers generally comprise from 10 to 25 percent by weight of the water treatment composition.
  • Conventional water treatment compositions are known to those skilled in the art, and exemplary water treatment compositions are set forth in the four formulations below. These compositions containing the polymer of the present invention have application in, for example, the oil field.
  • Formulation 1 Formulation 2 11.3% of Polymer of Ex. 1 11.3% Polymer of Ex. 3 47.7% Water 59.6% Water 4.2% HEDP 4.2% HEDP 10.3% NaOH 18.4% TKPP 24.5% Sodium Molybdate 7.2% NaOH 2.0% Tolyl triazole 2.0% Tolyl triazole pH 13.0 pH 12.64 Formulation 3 Formulation 4 22.6% of Polymer of Ex. 2 11.3% Polymer of Ex.
  • Example 4 The polymers in Example 4 and Comparative Example 2 were tested for anti-redeposition performance.
  • the data below indicates that the polymer of Example 4 was far superior to that of Comparative Example 2 in anti-redeposition properties. Further, the performance of polymer 4 proved superior to a commercial synthetic Na polyacrylate (Alcosperse 602N), which is an industry standard for this application.
  • Example 4 One wash anti-redeposition data using commercial Sun liquid detergent.
  • the test protocol is described in Example 4.
  • Lower Delta WI (whiteness index) numbers are better.
  • the data indicate that the low molecular weight graft copolymer of Example 4 produced using the Cu catalyst has superior anti-redeposition properties compared to the graft copolymer of Comparative Example 2 using the same amount of Fe.
  • Comparative Example 2 polymer performs similar to the control, which does not have any polymer.
  • the low molecular weight graft copolymer of this invention performs similar to the industry standard synthetic polyacrylic acid.
  • a reactor containing a mixture of 450 grams of water, 100 grams of maleic anhydride (1.02 moles), 300 grams of 80% solution of Cargill Sweet Satin Maltose, 0.0022 grams of Cu(II) sulfate pentahydrate and 75 grams of a 50% solution of NaOH was heated to 98° C.
  • a solution containing 140 grams of acrylic acid (1.94 moles) in 50 grams of water was added to the reactor over a period of 5 hours.
  • the mole percent of maleic in the synthetic part of the copolymer was 34.4.
  • the amount of natural component was 50 weight percent, based on total weight percent of natural component and synthetic monomers.
  • a reactor containing a mixture of 200 grams of water, 8 grams of maleic anhydride (0.08 moles), 160 grams of Cargill maltodextrin MD 1956 (DE 7.5) and 11.8 grams of a 50% solution of NaOH was heated to 98° C.
  • a shot of 0.0018 grams of ferrous ammonium sulfate hexahydrate was added to the reactor just before monomer and initiator feeds were started.
  • a solution containing 22 grams of acrylic acid (0.31 moles) in 71 grams of water was added to the reactor over a period of 150 minutes.
  • the mole percent of maleic in the synthetic part of the copolymer was 21.
  • the amount of natural component was 84.2 weight percent based on total weight percent of natural component and synthetic monomers.
  • each maleic anhydride group contributes 2 COOH moieties.
  • a reactor containing 140 grams of water, 65 grams of Flomax 8 (oxidized starch having a Mn of 9,891, available from National Starch and Chemical, Bridgewater, N.J.) and 0.00075 grams of FAS was heated to 98° C.
  • An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes.
  • the reaction product was held at 98° C. for an additional hour.
  • the polymer was then neutralized by adding 35 grams of a 50% solution of NaOH.
  • the final product was an opaque yellow solution.
  • the number average molecular weight of this polymer was 24,373 as determined by aqueous GPC.
  • the efficacy of various treatments was tested for their ability to prevent the precipitation of calcium carbonate in typical cooling water conditions (a property commonly referred to as the threshold inhibition).
  • This test was developed in correlation with the dynamic testing units, in order to allow for an initially quick screening test of scale threshold inhibitors for cooling water treatment.
  • the ratio of calcium concentration to alkalinity is 1.000:1.448 for the chosen water. This ratio is a fairly accurate average of cooling water conditions found worldwide. One should expect that water wherein the alkalinity is proportionately less will be able to reach higher levels of calcium, and that water containing a proportionally greater amount of alkalinity will reach lower levels of calcium.
  • cycle of concentration is a general term, one cycle was chosen, in this case, to be that level at which calcium concentrations equaled 100.0 mg/L Ca as CaCO 3 (40.0 mg/L as Ca).
  • the complete water conditions at one cycle of concentration i.e., make-up water conditions are as follows:
  • above average threshold inhibitors can reach anywhere from four to five cycles of concentration with this water before significant calcium carbonate precipitation begins. Average threshold inhibitors may only be able to reach three to four cycles of concentration before precipitating, while below average inhibitors may only reach two to three cycles of concentration before precipitation occurs. Polymer performance is generally expressed as percent calcium inhibition. This number is calculated by taking the actual soluble calcium concentration at any given cycle, dividing it by the intended soluble calcium concentration for that same given cycle, and then multiplying the result by 100.
  • All chemicals used are reagent grade and weighed on an analytical balance to ⁇ 0.0005 g of the indicated value. All solutions are made within thirty days of testing. Once the solutions are over thirty days old, they are remade.
  • the hardness, alkalinity, and 12% KCl solutions should be prepared in a one liter volumetric flask using DI water. The following amounts of chemical should be used to prepare these solutions—
  • a 250 mL of a 10,000 mg/L active treatment solution is made up. This was done for every treatment tested.
  • the pH of the solutions was adjusted to between 8.70 and 8.90 using 50% and 10% NaOH solutions by adding the weighed polymer into a specimen cup or beaker and filling with DI water to approximately 90 mL.
  • the pH of this solution was then adjusted to approximately 8.70 by first adding the 50% NaOH solution until the pH reaches 8.00, and then by using the 10% NaOH until the pH equals 8.70.
  • the solution was then poured into a 250 mL volumetric flask.
  • the specimen cup or beaker was rinsed with DI water and this water added to the flask until the final 250 mL is reached.
  • the formula used to calculate the amount of treatment to be weighed is as follows:
  • the incubator shaker should be turned on and set for a temperature of 50° C. to preheat.
  • 34 screw cap flasks were set out in groups of three to allow for triplicate testing of each treatment, allowing for testing of eleven different treatments. The one remaining flask was used as an untreated blank. Label each flask with the treatment added.
  • alkalinity solution Using a 2.5 mL electric pipette, add 1.60 mL of alkalinity solution to each flask. This is the amount that will achieve four cycles of make-up water. The addition of alkalinity should be done while swirling the flask, so as not to generate premature scale formation from high alkalinity concentration pooling at the addition site.
  • the percent inhibition is calculated for each treatment.
  • the lithium is used as a tracer of evaporation in each flask (typically about ten percent of the original volume).
  • the lithium concentration found in the “total” solution is assumed to be the starting concentration in all 34 flasks.
  • the concentrations of lithium in the 34 shaker samples can then each be divided by the lithium concentration found in the “total” sample. These results will provide the multiplying factor for increases in concentration, due to evaporation.
  • the calcium and magnesium concentrations found in the “total” solution are also assumed to be the starting concentrations in all 34 flasks.
  • Example 3 The polymer of Example 3 was tested in this test at 3 cycles of concentration and compared with a commercial polyacrylate (AQUATREAT 900A from Alco Chemical). The data indicate that the low molecular weight graft copolymer was as good a calcium carbonate inhibitor in this test.
  • Low molecular weight sulfonated graft copolymers are exemplified in U.S. Pat. No. 5,580,941. These materials are made using mercaptan chain transfer agents. Mercaptan chain transfer agents lower the molecular weight, but in the process generate synthetic polymers. These mercaptans stop a growing chain Equation 1 and start a new polymer chain Equation 2, illustrated in the mechanism below (Odian, P RINCIPLES OF P OLYMERIZATION, 2 nd Ed., John Wiley & Sons, p. 226, New York (1981)). This new chain is now comprised of ungrafted synthetic copolymers.
  • Comparative Example 5 of the '941 patent forms a precipitate when higher molecular weight saccharide (maltodextrin with DE 20) is used. This illustrates that there is little grafting and the resulting synthetic polymer is phase separating from the maltodextrin. This does not happen with the other examples because disaccharides like sucrose are used, which are small molecules and are compatible.
  • graft copolymers of the present invention can have greater than 50 wt % maltodextrin and are compatible, indicating high degree of grafting.
  • a reactor containing 156 grams of water, 49 grams of maltodextrin (Cargill MDTM 01918 maltodextrin, DE of 18) and 0.0039 grams of FAS was heated to 98° C.
  • a solution containing 81.6 grams of acrylic acid and 129.2 of a 50% solution of sodium 2-acrylamido-2-methyl propane sulfonate (AMPS) was added to the reactor over a period of 45 minutes.
  • An initiator solution comprising 13 grams of 35% hydrogen peroxide solution in 78 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes.
  • the reaction product was held at 98° C. for an additional hour.
  • the polymer was then neutralized by adding 27.2 grams of a 50% solution of NaOH.
  • the final product was a clear yellow solution.
  • the number average molecular weight of this polymer was 68,940.
  • This sample remained a clear solution showing no sign of precipitation (phase separation) even after 4 months.
  • a blend of Alcosperse 545 (AA-AMPS copolymer) and Cargill MDTM 01918 maltodextrin phase separates within a day. This is similar to the phase separation seen in Comparative Example 5 of the '941 patent where a maltodextrin having a DE of 20 (a lower molecular weight dextrin than that used in our recipe) is used. This clearly indicates that the Example 5 has very little graft copolymer due to the presence of mercaptan, which leads to a lot of synthetic copolymer.
  • CaCO 3 inhibition performance was evaluated according to NACETM 3076-2001 standardized test with a few modifications.
  • Our modified test used 30 mL total sample size instead of 100 mL indicated in the method.
  • the polymers were tested at 5, 10 and 15 ppm levels.
  • the samples were tested in triplicate rather than duplicate.
  • the samples were heated in heat block rather than oven or water bath and Ca concentration was determined by ICP.
  • the “blank before precipitation” was made by combining 15 mL Ca Brine+15 mL of NaCl Brine plus DI water in place of polymer treatment, and the “blank after precipitation” was made by combining 15 mL Ca Brine+15 mL of Bicarbonate Brine plus DI water instead of polymer.
  • An initiator solution comprising of 4.7 grams of sodium persulfate and 38.7 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water was added to the reactor at the same time as the monomer solution i.e. over a period of 4 hours.
  • the reaction product was held at 95° C. for 30 minutes.
  • 0.3 grams of erythorbic acid dissolved in 0.6 grams of water and simultaneously, 4 grams of a 41% bisulfite solution was added to scavenge the residual monomer.
  • the final product was a clear light amber solution and had 44% solids.
  • An initiator solution comprising of 4.8 grams of sodium persulfate and 38.7 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water was added to the reactor over a period of 5.5 hours. The reaction product was held at 95° C. for 30 minutes. 0.3 grams of erythorbic acid dissolved in 0.6 grams of water and simultaneously, 4 grams of a 41% bisulfite solution was added to scavenge the residual monomer. The final product was a clear light amber solution and had 35% solids. The number average molecular weight of this polymer as measured by aqueous GPC was 1755.
  • An initiator solution comprising of 2.4 grams of sodium persulfate and 19.4 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water was added to the reactor over a period of 5.5 hours. The reaction product was held at 95° C. for 30 minutes. 0.3 grams of erythorbic acid dissolved in 0.6 grams of water and simultaneously, 4 grams of a 41% bisulfite solution was added to scavenge the residual monomer. The final product was a clear light amber solution and had 44% solids. The number average molecular weight of this polymer as measured by aqueous GPC was 1280.
  • Example 38 The polymer of Example 38 was tested in all 3 of the brines detailed in Table 1. The data indicate that the polymer is very compatible in these brines.
  • a reactor containing 150 grams of water, 90 grams of a 50% solution of NaOH, 10 grams of maltodextrin (Cargill MDTM 01960 dextrin) and 0.00075 grams of ferrous ammonium sulfate hexahydrate (‘FAS’) was heated to 98° C.
  • a solution containing 90 grams of acrylic acid was added to the reactor over a period of 45 minutes.
  • An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour.
  • the pH of the polymer solution was 7.
  • the graft copolymer of this Example with low levels of saccharide functionality (10 weight percent) was tested for brine compatibility in Brine 3. This polymer was found to be insoluble in Brine 3 when dosed at 250, 1,000, 5,000, 25,000 and 100,000 ppm levels.
  • An initiator solution comprising of 5.4 grams of sodium persulfate and 45 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water is added to the reactor over a period of 5.5 hours. The reaction product is held at 95° C. for 60 minutes.
  • the graft copolymer of this Example with low levels of saccharide functionality (10 weight percent) is tested for brine compatibility in Brine 3.
  • the polymer is found to be insoluble in Brine 3 when dosed at 250, 1,000, 5,000, 25,000 and 100,000 ppm levels.

Abstract

Low molecular weight graft copolymer comprising a synthetic component formed from at least one or more olefinically unsaturated carboxylic acid monomers or salts thereof, and a natural component formed from a hydroxyl-containing natural moiety. The number average molecular weight of the graft copolymer is about 100,000 or less, and the weight percent of the natural component in the graft copolymer is about 50 wt % or greater based on total weight of the graft copolymer. Processes for preparing such graft copolymers are also disclosed.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • The present application is a continuation-in-part of U.S. application Ser. No. 11/459,233, filed 21 Jul. 2006.
  • The present invention relates to graft copolymers of synthetic and naturally derived materials. More particularly, the present invention is directed towards low molecular weight graft copolymers, as well as anti-scalant and/or dispersant formulations or compositions comprising such polymers and their use in aqueous systems, including scale minimization and dispersancy.
  • Many aqueous industrial systems require that various materials remain in a soluble, suspended or dispersed state. Examples of such aqueous systems include boiler water or steam generating systems, cooling water systems, gas scrubbing systems, pulp and paper mill systems, desalination systems, fabric, dishware and hard surface cleaning systems, as well as downhole systems encountered during the production of gas, oil, and geothermal wells. Often the water in those systems either naturally or by contamination contains ingredients such as inorganic salts. These salts can cause accumulation, deposition, and fouling problems in aqueous systems such as those mentioned above if they are not kept in a soluble, suspended or dispersed state.
  • Inorganic salts are typically formed by the reaction of metal cations (e.g., calcium, magnesium or barium) with inorganic anions (e.g., phosphate, carbonate or sulfate). When formed, the salts tend to be insoluble or have low solubility in water. As their concentration in solution increases, or as the pH and/or temperature of the solution containing those salts changes, the salts can precipitate from solution, crystallize and form hard deposits or scale on surfaces. This scale formation is a problem in equipment such as heat transfer devices, boilers, secondary oil recovery wells, and automatic dishwashers, as well as on substrates washed with such hard waters, causing a reduction in the performance and life of the equipment.
  • In addition to scale formation many cooling water systems made from carbon steel, for example, industrial cooling towers and heat exchangers, experience corrosion problems. Attempts to prevent this corrosion are often made by adding various inhibitors such as orthophosphate and/or zinc compounds to the water. However, phosphate addition increases the formation of highly insoluble phosphate salts such as calcium phosphate. The addition of zinc compounds can lead to precipitation of insoluble salts such as zinc hydroxide and zinc phosphate.
  • Other inorganic particulates such as mud, silt and clay can also be commonly found in cooling water systems. These particulates tend to settle onto surfaces, thereby restricting water flow and heat transfer unless they are effectively dispersed. Synthetic polymers such as polyacrylic acid are well known as excellent dispersants for these inorganic particulates.
  • Stabilization of aqueous systems containing scale-forming salts and inorganic particulates involves a variety of mechanisms. Dispersion of precipitated salt crystals in an aqueous solution is one conventional mechanism for eliminating the deleterious effect of scale-forming salts. In this mechanism, the precipitants remain dispersed, as opposed to settling or dissolving in the aqueous solution. Synthetic polymers having carboxylic acid groups function as good dispersants for precipitated salts such as calcium carbonates.
  • Another stabilization mechanism is inhibiting the formation of scale-forming salts. In inhibition, synthetic polymer(s) that can increase the solubility of scale-forming salts in an aqueous system are added.
  • A third stabilization mechanism involves interference and distortion of the crystal structure of the scale by introduction of certain synthetic polymer(s), thereby making the scale less adherent to surfaces, other forming crystals and/or existing particulates.
  • Synthetic polymers such as polyacrylic acid have been used to minimize scale formation in aqueous treatment systems for a number of years. Synthetic polymers can also impart many useful functions in cleaning compositions. For example, polyacrylic acid is widely used as a viscosity reducer in processing powdered detergents. Synthetic polymers can also serve as anti-redeposition agents, dispersants, scale and deposit inhibitors, and/or crystal modifiers, thereby improving whiteness maintenance in the washing process. However, lately there has been a shortage of petroleum-based monomers required to produce these synthetic polymers due to rising demand and tight crude oil supplies. Hence, there is a need to replace these synthetic polymers with other copolymers that are at least partially derived from renewal natural sources. Such naturally derived polymers will have a better biodegradable profile than synthetic polymers, which tend to be non-biodegradable.
  • Cleaning formulations can contain builders such as phosphates and carbonates for boosting their cleaning performance. These builders tend to precipitate out in the form of insoluble salts such as calcium carbonate, calcium phosphate, and calcium orthophosphate. The precipitants form deposits on clothes and dishware, resulting in unsightly films and spots on these articles. Similarly, these insoluble salts can cause major problem in downhole oilfield applications. Synthetic polymers such as polyacrylic acid are widely used to minimize the scaling of insoluble salts in water treatment, oilfield and cleaning formulations.
  • A number of attempts have been made in the past to use natural materials as polymeric building blocks. These have mainly centered on grafting natural materials (e.g., sugars and starches) with synthetic monomers. For example, U.S. Pat. Nos. 5,854,191, 5,223,171, 5,227,446 and 5,296,470 disclose the use of graft copolymers in cleaning applications. U.S. Pat. Nos. 5,580,154 and 5,580,941 disclose sulfonated monomers grafted on to mono-, di- and oligosaccharides.
  • Unfortunately, graft copolymers typically do not perform as well as synthetic polymers in applications such as those described above (e.g., inhibition, dispersion and/or interference). Therefore, there is a need for graft copolymers that perform at least as well as their synthetic counterparts.
  • Further, previous attempts at graft copolymers have resulted in copolymers having relatively low amounts of the natural component or constituent. With increasing shortages of crude oil and petroleum derivatives, there is a need to increase the level of natural component of these graft copolymers. Doing so will result in copolymers that are less expensive and more environmentally friendly in that the copolymers will be produced from predominantly renewable raw materials.
  • Finally, many of the graft copolymers described in the art, especially those containing maleic acid, tend to be extremely dark colored solutions. This dark coloring is not desirable in cleansing (e.g., detergent) applications. Accordingly, there is a need for graft copolymers useful in cleansing applications that provide light or clear colored solutions.
  • The present invention discloses low molecular weight graft copolymers that function as an effective and at least partial replacement for synthetic polymers (e.g., polyacrylic acid) used in dispersancy applications in aqueous treatment systems. Additionally, the present invention discloses graft copolymers having a high degree of the natural component or constituent. Finally, the present invention discloses low or slightly colored graft copolymers and the processes for preparing these copolymers.
  • Low molecular weight graft copolymers according to the present invention are effective at minimizing a number of different scales, including phosphate, sulfonate, carbonate and silicate based scales. The scale-minimizing polymers are useful in a variety of systems, including water treatment compositions, oil field related compositions, cement compositions, cleaning formulations and other aqueous treatment compositions. Polymers according to the present invention have been found to be particularly useful in minimizing scale by dispersing precipitants, inhibiting scale formation, and/or interference and distortion of crystal structure.
  • It has now been found that low molecular weight graft copolymer may be produced by grafting synthetic monomers onto hydroxyl-containing natural moieties. The resulting materials provide the performance of synthetic polymers while making use of lower cost, readily available and environmentally friendly materials derived from renewable sources. These materials can be used in water treatment, detergent, oil field and other dispersant applications.
  • The low molecular weight graft copolymer is useful as a dispersant in water treatment and oilfield applications. In water treatment compositions, the polymer is present in an amount of about 0.001% to about 25% by weight of the composition.
  • The present invention further provides a process for making lighter color graft copolymers. In one aspect, this can be achieved by carrying out the polymerization reaction at acidic pH. Additionally, use of copper salts and lower feed times in the process allows for production of products low in color.
  • As such, the present invention provides for low molecular weight graft copolymers having a synthetic component formed from at least one or more olefinically unsaturated carboxylic acid monomers or salts thereof, and a natural component formed from a hydroxyl-containing natural moiety. The number average molecular weight of the graft copolymer is about 100,000 or less, and the weight percent of the natural component in the graft copolymer is about 5 wt % or greater based on total weight of the graft copolymer.
  • In one embodiment, the synthetic component in graft copolymers according to the present invention is further formed from one or more monomers having a nonionic, hydrophobic and/or sulfonic acid group, wherein the one or more monomers are incorporated into the copolymer in an amount of about 50 weight percent or less based on total weight of the graft copolymer. In another aspect, the one or more monomers are incorporated into the copolymer in an amount of about 10 weight percent or less based on total weight of the graft copolymer.
  • The hydroxyl-containing natural moiety of the graft copolymer can be water soluble. In another aspect, the hydroxyl-containing natural moiety is degraded.
  • The carboxylic acid monomer of the graft copolymer can be, for example, acrylic acid, maleic acid, methacrylic acid or mixtures thereof In one aspect, the carboxylic acid monomer is acrylic acid. In another aspect, the carboxylic acid monomer is acrylic acid and maleic acid.
  • According to the present invention, the weight percent of the natural component in the graft copolymer can be about 50 wt % or greater based on total weight of the graft copolymer. Examples of the natural component include glycerol, citric acid, maltodextrins, pyrodextrins, corn syrups, maltose, sucrose, low molecular weight oxidized starches and mixtures thereof.
  • In another aspect the present invention is directed towards cleaning compositions comprising the graft copolymer according to the present invention. The graft copolymer can be present in the cleaning composition in an amount of from about 0.01 to about 10 weight %, based on total weight of the cleaning composition. The cleaning composition can include one or more adjuvants. Further, the cleaning composition can be a detergent composition, with the graft copolymer having a Gardner color of about 12 or less. In one aspect, the detergent composition can be a powdered detergent or unit dose composition. In another aspect, the detergent composition can be an autodish composition. In even a further aspect, the detergent composition can be a zero phosphate composition.
  • The present invention is also directed towards a method of reducing spotting and/or filming in the rinse cycle of an automatic dishwasher by adding to the rinse cycle a rinse aid composition comprising a graft copolymer according to the present invention. In another embodiment, the present invention is directed towards a method of improving sequestration, threshold inhibition and soil removal in a cleaning composition by adding a graft copolymer according to the present invention to a cleaning composition.
  • In another embodiment, the present invention is directed towards water treatment systems comprising graft copolymers according to the present invention. The graft copolymer can be present in the system in an amount of at least about 0.5 mg/L. In another embodiment, the present invention is directed towards a method of dispersing and/or minimizing scale in an aqueous system by adding a graft copolymer according to the present invention to a water treatment system.
  • In another embodiment, the present invention is directed towards a method of dispersing pigments and/or minerals in an aqueous system by adding a dispersant composition comprising a graft copolymer according to the present invention to the aqueous system. In one aspect, the minerals dispersed include, for example, titanium dioxide, kaolin clays, modified kaolin clays, calcium carbonates and synthetic calcium carbonates, iron oxides, carbon black, talc, mica, silica, silicates, aluminum oxide or mixtures thereof.
  • In one embodiment, the present invention is directed towards a method of dispersing soils and/or dirt from hard and/or soft surfaces by treating the hard and/or soft surfaces with a cleaning composition comprising a graft copolymer according to the present invention. In another aspect, the present invention is directed towards a method of dispersing soils and/or dirt in aqueous systems by treating the aqueous system with an aqueous treatment composition comprising a graft copolymer according to the present invention.
  • The present invention also provides for a process for producing low molecular weight graft copolymers having a synthetic component and a natural component. The process includes degrading the natural component to a number average molecular weight of about 100,000 or less, reacting the natural component with a free radical initiating system having a metal ion to generate free radicals on the natural component, and polymerizing the free radical-containing natural component with a synthetic component. The resultant low molecular weight graft copolymer has a Gardner color of about 12 or less. The process can also include polymerizing the free radical-containing natural component with the synthetic component at ambient pressure and a reaction temperature of about 40° C. to about 130° C. The metal ion in the free radical initiating system can be a Cu (II) salt. In one aspect, polymerization can occur at a pH of about 6 or less.
  • Low molecular weight graft copolymers according to the present invention are produced by grafting synthetic monomers onto hydroxyl-containing naturally derived materials. These hydroxyl-containing naturally derived materials range from small molecules such as glycerol, citric acid, lactic acid, tartaric acid, gluconic acid, glucoheptonic acid, monosaccharides and disaccharides such as sugars, to larger molecules such as oligosaccharides and polysaccharides (e.g., maltodextrins and starches). Examples of these include sucrose, fructose, maltose, glucose, and saccharose, as well as reaction products of saccharides such as mannitol, sorbitol and so forth.
  • Use of natural materials to produce a low molecular weight graft copolymer is an attractive and readily available substitute for current synthetic materials. For example, glycerol is a by-product of biodiesel production. Glycerol is also a by-product of oils and fats used in the manufacture of soaps and fatty acids. It can also be produced by fermentation of sugar. Citric acid is produced industrially by fermentation of crude sugar solutions. Lactic acid is produced commercially by fermentation of whey, cornstarch, potatoes, molasses, etc. Tartaric acid is one byproduct of the wine making process.
  • Polysaccharides useful in the present invention can also be derived from plant, animal and microbial sources. Examples of such polysaccharides include starch, cellulose, gums (e.g., gum arabic, guar and xanthan), alginates, pectin and gellan. Starches include those derived from maize and conventional hybrids of maize, such as waxy maize and high amylose (greater than 40% amylose) maize, as well as other starches such as potato, tapioca, wheat, rice, pea, sago, oat, barley, rye, and amaranth, including conventional hybrids or genetically engineered materials. Also included are hemicellulose or plant cell wall polysaccharides such as D-xylans. Examples of plant cell wall polysaccharides include arabino-xylans such as corn fiber gum, a component of corn fiber.
  • Useful polysaccharides should be water soluble during the reaction. This implies that the polysaccharides either have a molecular weight low enough to be water soluble or can be hydrolyzed in situ during the reaction to become water soluble. For example, non-degraded starches are not water soluble. However, degraded starches are water soluble and can be used.
  • Accordingly, hydroxyl-containing natural materials include oxidatively, hydrolytically or enzymatically degraded monosaccharides, oligosaccharides and polysaccharides, as well as chemically modified monosaccharides, oligosaccharides and polysaccharides. Chemically modified derivatives include carboxylates, sulfonates, phosphates, phosphonates, aldehydes, silanes, alkyl glycosides, alkyl-hydroxyalkyls, carboxy-alkyl ethers and other derivatives. The polysaccharide can be chemically modified before, during or after the grafting reaction.
  • Generally speaking, degraded polysaccharides according to the present invention can have a number average molecular weight of about 100,000 or lower. In one aspect, the number average molecular weight (Mn) of the low molecular weight graft copolymer is about 25,000 or less. In another aspect, the degraded polysaccharides have a number average molecular weight of about 10,000 or less.
  • Polysaccharides useful in the present invention further include pyrodextrins. Pyrodextrins are made by heating acidified, commercially dry starch to a high temperature. Extensive degradation occurs initially due to the usual moisture present in starch. However, unlike the above reactions that are done in aqueous solution, pyrodextrins are formed by heating powders. As moisture is driven off by the heating, hydrolysis stops and recombination of hydrolyzed starch fragments occur. This recombination reaction makes these materials distinct from maltodextrins, which are hydrolyzed starch fragments. The resulting pyrodextrin product also has much lower reducing sugar content, as well as color and a distinct odor.
  • Other polysaccharides useful in this invention include maltodextrins, which are polymers having D-glucose units linked primarily by α-1,4 bonds and a dextrose equivalent (‘DE’) of less than about 20. Dextrose equivalent is a measure of the extent of starch hydrolysis. It is determined by measuring the amount of reducing sugars in a sample relative to dextrose (glucose). The DE of dextrose is 100, representing 100% hydrolysis. The DE value gives the extent of hydrolysis (e.g., 10 DE is more hydrolyzed than 5 DE maltodextrin). Maltodextrins are available as a white powder or concentrated solution and are prepared by the partial hydrolysis of starch with acid and/or enzymes.
  • Polysaccharides useful in the present invention can further include corn syrups. Corn syrups are defined as degraded starch products having a DE of 27 to 95. Examples of specialty corn syrups include high fructose corn syrup and high maltose corn syrup. Monosaccharides and oligosaccharides such as galactose, mannose, sucrose, ribose, trehalose, lactose, etc., can be used.
  • Polysaccharides can be modified or derivatized by etherification (e.g., via treatment with propylene oxide, ethylene oxide, 2,3-epoxypropyl trimethyl ammonium chloride), esterification (e.g., via reaction with acetic anhydride, octenyl succinic anhydride (‘OSA’)), acid hydrolysis, dextrinization, oxidation or enzyme treatment (e.g., starch modified with α-amylase, β-amylase, pullanase, isoamylase or glucoamylase), or various combinations of these treatments. These treatments can be performed before or after the graft copolymerization process.
  • In one aspect the natural component of the low molecular weight graft copolymer is glycerol, citric acid, maltodextrins and/or low molecular weight oxidized starches.
  • Low molecular weight graft copolymers according to the present invention are grafted using olefinically unsaturated carboxylic acid monomers as the synthetic component. As used herein, olefinically unsaturated carboxylic acid monomers include, for example, aliphatic, branched or cyclic, mono- or dicarboxylic acids, the alkali or alkaline earth metal or ammonium salts thereof, and the anhydrides thereof. Examples of such olefinically unsaturated carboxylic acid monomers include but are not limited to acrylic acid, methacrylic acid, ethacrylic acid, α-chloro-acrylic acid, α-cyano acrylic acid, β-methyl-acrylic acid (crotonic acid), α-phenyl acrylic acid, β-acryloxy propionic acid, sorbic acid, α-chloro sorbic acid, angelic acid, cinnamic acid, p-chloro cinnamic acid, β-styryl acrylic acid (1-carboxy-4-phenyl butadiene-1,3), itaconic acid, maleic acid, citraconic acid, mesaconic acid, glutaconic acid, aconitic acid, fumaric acid, tricarboxy ethylene, and 2-acryloxypropionic acid. Moieties such as maleic anhydride or acrylamide that can be derivatized to an acid containing group can be used. Combinations of olefinically unsaturated carboxylic acid monomers can also be used. In one aspect the olefinically unsaturated carboxylic acid monomer is acrylic acid, maleic acid, or methacrylic acid, or mixtures thereof.
  • Small amounts of other monomers can optionally be added to the graft copolymerization process without any significant drop in performance. These optional monomers can be a monomer with a non-ionic, hydrophobic or sulfonic acid group. The monomer can be incorporated into the copolymer at about 50 or less weight percent based on total weight of the low molecular weight graft copolymer. In another aspect, the optional monomer can be added at about 10 or less weight percent of the graft copolymer. In even another aspect, the optional monomer can be added at about 4 or less weight percent of the graft copolymer.
  • Examples of optional monomers with sulfonic acid groups include 2-acrylamido-2-methyl propane sulfonic acid, vinyl sulfonic acid, sodium methallyl sulfonate, sulfonated styrene, allyloxybenzene sulfonic acid and combinations thereof.
  • Examples of optional hydrophobic monomers include saturated or unsaturated alkyl, hydroxyalkyl, alkylalkoxy groups, arylalkoxy, alkarylalkoxy, aryl and aryl-alkyl groups, alkyl sulfonate, aryl sulfonate, siloxane and combinations thereof. Examples of hydrophobic monomers include styrene, α-methyl styrene, methyl methacrylate, methyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, lauryl acrylate, stearyl acrylate, behenyl acrylate, 2-ethylhexyl methacrylate, octyl methacrylate, lauryl methacrylate, stearyl methacrylate, behenyl methacrylate, 2-ethylhexyl acrylamide, octyl acrylamide, lauryl acrylamide, stearyl acrylamide, behenyl acrylamide, propyl acrylate, butyl acrylate, pentyl acrylate, hexyl acrylate, 1-vinyl naphthalene, 2-vinyl naphthalene, 3-methyl styrene, 4-propyl styrene, t-butyl styrene, 4-cyclohexyl styrene, 4-dodecyl styrene, 2-ethyl-4-benzyl styrene, and 4-(phenyl butyl)styrene. Combinations of hydrophobic monomers can also be used.
  • Examples of optional non-ionic monomers include C1-C6 alkyl esters of (meth)acrylic acid and the alkali or alkaline earth metal or ammonium salts thereof, acrylamide and the C1-C6 alkyl-substituted acrylamides, the N-alkyl-substituted acrylamides and the N-alkanol-substituted acrylamides, hydroxyl alkyl acrylates and acrylamides. Also useful are the C1-C6 alkyl esters and C1-C6 alkyl half-esters of unsaturated vinylic acids, such as maleic acid and itaconic acid, and C1-C6 alkyl esters of saturated aliphatic monocarboxylic acids, such as acetic acid, propionic acid and valeric acid. In one aspect the nonionic monomers are selected from the group consisting of methyl methacrylate, methyl acrylate, hydroxyethyl(meth)acrylate and hydroxypropyl(meth)acrylate.
  • Low molecular weight copolymers according to the present invention perform similar to their synthetic counterparts, even at relatively high levels of the natural component within the copolymer. For example, the natural component of the low molecular weight graft copolymer can be from about 10 to about 95 weight % based on total weight of the polymer. In one aspect, the range is from about 20 to about 85 weight % of the natural component based on total weight of the polymer. In another aspect, the weight percent of the natural component in the low molecular weight graft copolymer is about 40 wt % or greater based on total weight of the polymer. In even another aspect, the weight percent of the natural component in the low molecular weight graft copolymer is about 60 wt % or greater. In another aspect, the weight percent of the natural component in the low molecular weight graft copolymer is about 80 wt % or greater.
  • In contrast, materials described in the art (exemplified in the comparative examples below) tend to drop in performance when the amount of natural component is increased. This level depends on the monomers used and the end use application of the product. For example, in the case of acrylic acid grafted materials used in dispersant application, low molecular weight copolymers according to the present invention perform similar to their synthetic counterpart, even when the level of natural component is greater than 50, and even 65 weight percent of the polymer (see, e.g., Examples 6 and 7 infra), whereas graft copolymers found in the art do not (see, e.g., Comparative Example 1 infra).
  • Further, it has been difficult in the past to produce polymers having a natural component of greater than 50 weight percent as the solutions often phase separate out. However, low molecular weight graft copolymers according to the present invention can be synthesized using 75, 85 and even 95 weight percent of the natural component (see, e.g., Examples 8, 9 and 10 infra). In the case of maleic acid where the end use application is dispersancy or anti-redeposition, materials found in the prior art tend to lose their efficacy at levels as low as 25 weight percent of the natural component (see, e.g., Comparative Example 2, illustrating in Example 24 poor anti-redeposition versus the inventive polymer of Example 4).
  • In one aspect, the number average molecular weight (Mn) of the low molecular weight graft copolymer is less than 100,000. In another aspect, the number average molecular weight of the low molecular weight graft copolymer is less than 25,000. In another aspect, the number average molecular weight of the polymer is less than 10,000. Optimum molecular weight depends on the monomers used in the grafting process and end use application. For example, acrylic acid grafted materials have been found to be excellent dispersants at Mn of less than 10,000.
  • The lower the molecular weights of the natural component, the lower the molecular weight of the resulting graft copolymer. In one aspect, the natural component has a number average molecular weight of about 100,000 or lower. In another aspect, the natural component has a number average molecular weight of about 10,000 or lower. Natural component include materials such as maltodextrins and corn syrups having a DE of about 5 or greater. In another aspect, natural components have a DE of about 10 or greater.
  • Low molecular weight graft copolymers according to the present invention have been found to be excellent dispersants in a wide variety of aqueous systems. These systems include but are not limited to water treatment, cleaning formulations, oilfield and pigment dispersion. These systems are described in further detail below. In another aspect, the low molecular weight graft copolymers have been found to be excellent sizing agents for fiberglass, non-wovens and textiles.
  • Cleaning Formulations—
  • Low molecular weight graft copolymers according to the present invention can also be used in a variety of cleaning formulations. Such formulations include both powdered and liquid laundry formulations such as compact and heavy duty detergents (e.g., builders, surfactants, enzymes, etc.), automatic dishwashing detergent formulations (e.g., builders, surfactants, enzymes, etc.), light-duty liquid dishwashing formulations, rinse aid formulations (e.g., acid, nonionic low foaming surfactants, carrier, etc.) and/or hard surface cleaning formulations (e.g., zwitterionic surfactants, germicide, etc.).
  • The graft copolymers can be used as viscosity reducers in processing powdered detergents. They can also serve as anti-redeposition agents, dispersants, scale and deposit inhibitors, and crystal modifiers, providing whiteness maintenance in the washing process.
  • Any suitable adjunct ingredient in any suitable amount can be used in the cleaning formulations described herein. Useful adjunct ingredients include, but are not limited to, aesthetic agents, anti-filming agents, antiredeposition agents, anti-spotting agents, beads, binders, bleach activators, bleach catalysts, bleach stabilizing systems, bleaching agents, brighteners, buffering agents, builders, carriers, chelants, clay, color speckles, control release agents, corrosion inhibitors, dishcare agents, disinfectant, dispersant agents, draining promoting agents, drying agents, dyes, dye transfer inhibiting agents, enzymes, enzyme stabilizing systems, fillers, free radical inhibitors, fungicides, germicides, hydrotropes, opacifiers, perfumes, pH adjusting agents, pigments, processing aids, silicates, soil release agents, suds suppressors, surfactants, stabilizers, thickeners, zeolite, and mixtures thereof.
  • The cleaning formulations can further include builders, enzymes, surfactants, bleaching agents, bleach modifying materials, carriers, acids, corrosion inhibitors and aesthetic agents. Suitable builders include, but are not limited to, alkali metals, ammonium and alkanol ammonium salts of polyphosphates, alkali metal silicates, alkaline earth and alkali metal carbonates, nitrilotriacetic acids, polycarboxylates, (such as citric acid, mellitic acid, succinic acid, oxydisuccinic acid, polymaleic acid, benzene 1,3,5-tricarboxylic acid, carboxymethyl oxysuccinic acid, and water-soluble salts thereof), phosphates (e.g., sodium tripolyphosphate), and mixtures thereof. Suitable enzymes include, but are not limited to, proteases, amylases, cellulases, lipases, carbohydrases, bleaching enzymes, cutinases, esterases, and wild-type enzymes. Suitable surfactants include, but are not limited to, nonionic surfactants, anionic surfactants, cationic surfactants, ampholytic surfactants, zwitterionic surfactants, and mixtures thereof. Suitable bleaching agents include, but are not limited to, common inorganic/organic chlorine bleach (e.g., sodium or potassium dichloroisocyanurate dihydrate, sodium hypochlorite, sodium hypochloride), hydrogen-peroxide releasing salt (such as, sodium perborate monohydrate (PB1), sodium perborate tetrahydrate (PB4)), sodium percarbonate, sodium peroxide, and mixtures thereof. Suitable bleach-modifying materials include but are not limited to hydrogen peroxide-source bleach activators (e.g., TAED), bleach catalysts (e.g. transition containing cobalt and manganese). Suitable carriers include, but are not limited to: water, low molecular weight organic solvents (e.g., primary alcohols, secondary alcohols, monohydric alcohols, polyols, and mixtures thereof), and mixtures thereof.
  • Suitable acids include, but are not limited to, acetic acid, aspartic acid, benzoic acid, boric acid, bromic acid, citric acid, formic acid, gluconic acid, glutamic acid, hydrochloric acid, lactic acid, malic acid, nitric acid, sulfamic acid, sulfuric acid, tartaric acid, and mixtures thereof. Suitable corrosion inhibitors, include, but are not limited to, soluble metal salts, insoluble metal salts, and mixtures thereof. Suitable metal salts include, but are not limited to, aluminum, zinc (e.g., hydrozincite), magnesium, calcium, lanthanum, tin, gallium, strontium, titanium, and mixtures thereof. Suitable aesthetic agents include, but are not limited to, opacifiers, dyes, pigments, color speckles, beads, brighteners, and mixtures thereof.
  • With the addition of suitable adjuncts, the cleaning formulations described herein can be useful as automatic dishwashing detergent (‘ADD’) compositions (e.g., builders, surfactants, enzymes, etc.), light-duty liquid dishwashing compositions, laundry compositions such as, compact and heavy-duty detergents (e.g., builders, surfactants, enzymes, etc.), rinse aid compositions (e.g., acids, nonionic low-foaming surfactants, carriers, etc.), and/or hard surface cleaning compositions (e.g., zwitterionic surfactants, germicides, etc.). Cleaning formulations according to the present invention include both phosphate and zero-phosphate formulations.
  • Suitable adjunct ingredients are disclosed in one or more of the following: U.S. Pat. Nos. 2,798,053; 2,954,347; 2,954,347; 3,308,067; 3,314,891; 3,455,839; 3,629,121; 3,723,322; 3,803,285; 3,929,107, 3,929,678; 3,933,672; 4,133,779; 4,141,841; 4,228,042; 4,239,660; 4,260,529; 4,265,779; 4,374,035; 4,379,080; 4,412,934; 4,483,779; 4,483,780; 4,536,314; 4,539,130; 4,565,647; 4,597,898; 4,606,838; 4,634,551; 4,652,392; 4,671,891; 4,681,592; 4,681,695; 4,681,704; 4,686,063; 4,702,857; 4,968,451; 5,332,528; 5,415,807; 5,435,935; 5,478,503; 5,500,154; 5,565,145; 5,670,475; 5,942,485; 5,952,278; 5,990,065; 6,004,922; 6,008,181; 6,020,303; 6,022,844; 6,069,122; 6,060,299; 6,060,443; 6,093,856; 6,130,194; 6,136,769; 6,143,707; 6,150,322; 6,153,577; 6,194,362; 6,221,825; 6,365,561; 6,372,708; 6,482,994; 6,528,477; 6,573,234; 6,589,926; 6,627,590; 6,645,925; and 6,656,900; International Publication Nos. 00/23548; 00/23549; 00/47708; 01/32816; 01/42408; 91/06637; 92/06162; 93/19038; 93/19146; 94/09099; 95/10591; 95/26393; 98/35002; 98/35003; 98/35004; 98/35005; 98/35006; 99/02663; 99/05082; 99/05084; 99/05241; 99/05242; 99/05243; 99/05244; 99/07656; 99/20726; and 99/27083; European Patent No. 130756; British Publication No. 1137741 A; CHEMTECH, pp. 30-33 (March 1993); J. AMERICAN CHEMICAL SOC., 115, 10083-10090 (1993); and Kirk Othmer ENCYCLOPEDIA OF CHEMICAL TECHNOLOGY, 3rd Ed., Vol. 7, pp. 430-447 (John Wiley & Sons, Inc., 1979).
  • In one embodiment, cleaning formulations according to the present invention can include from 0% to about 99.99% by weight of the formulation of a suitable adjunct ingredient. In another aspect, the cleaning formulations can include from about 0.01% to about 95% by weight of the formulation of a suitable adjunct ingredient. In other various aspects, the cleaning formulations can include from about 0.01% to about 90%, or from about 0.01% to about 80%, or from about 0.01% to about 70%, or from about 0.01% to about 60%, or from about 0.01% to about 50%, or from about 0.01% to about 40%, or from about 0.01% to about 30%, or from about 0.01% to about 20%, or from about 0.01% to about 10%, or from about 0.01% to about 5%, or from about 0.01% to about 4%, or from about 0.01% to about 3%, or from about 0.01% to about 2%, or from about 0.01% to about 1%, or from about 0.01% to about 0.5%, or alternatively from about 0.01% to about 0.1%, by weight of the formulation of a suitable adjunct ingredient.
  • Cleaning formulations can be provided in any suitable physical form. Examples of such forms include solids, granules, powders, liquids, pastes, creams, gels, liquid gels, and combinations thereof. Cleaning formulations used herein include unitized doses in any of a variety of forms, such as tablets, multi-phase tablets, gel packs, capsules, multi-compartment capsules, water-soluble pouches or multi-compartment pouches. Cleaning formulations can be dispensed from any suitable device. Suitable devices include, but are not limited to, wipes, hand mittens, boxes, baskets, bottles (e.g., pourable bottles, pump assisted bottles, squeeze bottles), multi-compartment bottles, jars, paste dispensers, and combinations thereof.
  • In the case of additive or multi-component products contained in single- and/or multi-compartment pouches, capsules, or bottles, it is not required that the adjunct ingredients or cleaning formulations be in the same physical form. In one non-limiting embodiment, cleaning formulations can be provided in a multi-compartment, water-soluble pouch comprising both solid and liquid or gel components in unit dose form. The use of different forms can allow for controlled release (e.g., delayed, sustained, triggered or slow release) of the cleaning formulation during treatment of a surface (e.g., during one or more wash and/or rinse cycles in an automatic dishwashing machine).
  • The pH of these formulations can range from 1 to 14 when the formulation is diluted to a 1% solution. Most formulations are neutral or basic, meaning in the pH range of 7 to about 13.5. However, certain formulations can be acidic, meaning a pH range from 1 to about 6.5.
  • Copolymers according to the present invention can also be used in a wide variety of cleaning formulations containing phosphate-based builders. These formulations can be in the form of a powder, liquid or unit doses such as tablets or capsules, and can be used to clean a variety of substrates such as clothes, dishes, and hard surfaces such as bathroom and kitchen surfaces. The formulations can also be used to clean surfaces in industrial and institutional cleaning applications.
  • In cleaning formulations, the polymer can be diluted in the wash liquor to end use level. The polymers are typically dosed at 0.01 to 1000 ppm in the aqueous wash solutions.
  • Optional components in detergent formulations include, but are not limited to, ion exchangers, alkalies, anticorrosion materials, anti-redeposition materials, optical brighteners, fragrances, dyes, fillers, chelating agents, enzymes, fabric whiteners and brighteners, sudsing control agents, solvents, hydrotropes, bleaching agents, bleach precursors, buffering agents, soil removal agents, soil release agents, fabric softening agent and opacifiers. These optional components can comprise up to about 90% by weight of the detergent formulation.
  • The polymers of this invention can be incorporated into hand dish, autodish and hard surface cleaning formulations. The polymers can also be incorporated into rinse aid formulations used in autodish formulations. Autodish formulations can contain builders such as phosphates and carbonates, bleaches and bleach activators, and silicates. These polymers can also be used in reduced phosphate formulations (i.e., less than 1500 ppm in the wash) and zero phosphate autodish formulations. In zero-phosphate autodish formulations, removal of the phosphates negatively affects cleaning, as phosphates provide sequestration and calcium carbonate inhibition. Graft copolymers according to the present invention aid in sequestration and threshold inhibition, and therefore are suitable for use in zero-phosphate autodish formulations.
  • The above formulations can also include other ingredients such as enzymes, buffers, perfumes, anti-foam agents, processing aids, and so forth. Hard surface cleaning formulations can contain other adjunct ingredients and carriers. Examples of adjunct ingredients include, without limitation, buffers, builders, chelants, filler salts, dispersants, enzymes, enzyme boosters, perfumes, thickeners, clays, solvents, surfactants and mixtures thereof.
  • One skilled in the art will recognize that the amount of polymer(s) required depends upon the cleaning formulation and the benefit they provide to the formulation. In one aspect, use levels can be about 0.01 weight % to about 10 weight % of the cleaning formulation. In another embodiment, use levels can range from about 0.1 weight % to about 2 weight % of the cleaning formulation.
  • Water Treatment Systems—
  • A common problem in industrial water treatment is water-borne deposits, commonly known as foulants. Foulants are loose, porous, insoluble materials suspended in water. They can include such diverse substances as particulate matter scrubbed from the air, migrated corrosion products, silt, clays and sand suspended in the makeup water, organic contaminants (oils), biological matter, and extraneous materials such as leaves, twigs and wood fibers from cooling towers. Fouling can reduce heat transfer by interfering with the flow of cooling water. Additionally, fouling can reduce heat transfer efficiency by plugging heat exchangers. Low molecular weight graft copolymers according to the present invention are excellent dispersants for foulants, and can minimize their deleterious effects in water treatment applications.
  • Water treatment includes prevention of calcium scales due to precipitation of calcium salts such as calcium carbonate, calcium sulfate and calcium phosphate. These salts are inversely soluble, meaning that their solubility decreases as the temperature increases. For industrial applications where higher temperatures and higher concentrations of salts are present, this usually translates to precipitation occurring at the heat transfer surfaces. The precipitating salts can then deposit onto the surface, resulting in a layer of calcium scale. The calcium scale can lead to heat transfer loss in the system and cause overheating of production processes. This scaling can also promote localized corrosion.
  • Calcium phosphate, unlike calcium carbonate, is generally not a naturally occurring problem. However, orthophosphates are commonly added to industrial systems (and sometimes to municipal water systems) as a corrosion inhibitor for ferrous metals, typically at levels between 2.0-20.0 mg/L. Therefore, calcium phosphate precipitation can not only result in those scaling problems previously discussed, but can also result in severe corrosion problems as the orthophosphate is removed from solution. As a consequence, industrial cooling systems require periodic maintenance wherein the system must be shut down, cleaned and the water replaced. Lengthening the time between maintenance shutdowns saves costs and is desirable.
  • One way to lengthen the time between maintenance in a water treatment system is to use polymers that function in either inhibiting formation of calcium salts or in modifying crystal growth. Crystal growth modifying polymers alter the crystal morphology from regular structures (e.g., cubic) to irregular structures such as needlelike or florets. Because of the change in form, crystals that are deposited are easily removed from the surface simply by mechanical agitation resulting from water flowing past the surface. Low molecular weight graft copolymers according to the present invention are particularly useful at inhibiting calcium phosphate based scale formation such as calcium orthophosphate. Further, these inventive copolymers also modify crystal growth of calcium carbonate scale.
  • It is also advantageous to reuse the water in industrial water treatment systems as much as possible, thereby increasing the time between maintenance. Still, water can be lost over time due to various mechanisms such as evaporation and/or spillage. As a consequence, dissolved and suspended solids tend to become more concentrated over time. Cycles of concentration refers to the number of times solids in a particular volume of water are concentrated. The quality of the water makeup determines how many cycles of concentration can be tolerated. In cooling tower applications where water makeup is hard (i.e., poor quality), 2 to 4 cycles would be considered normal, while 5 and above would represent stressed conditions. Low molecular weight graft copolymers according to the present invention have been found to be effective under stressed conditions.
  • Copolymers according to the present invention can be added to the aqueous systems neat, or they can be formulated into various water treatment compositions and then added to the aqueous systems. In certain aqueous systems where large volumes of water are continuously treated to maintain low levels of deposited matter, the copolymers can be used at levels as low as 0.5 mg/L. The upper limit on the amount of copolymer used depends upon the particular aqueous system treated. For example, when used to disperse particulate matter, the copolymer can be used at levels ranging from about 0.5 to about 2,000 mg/L. When used to inhibit formation or deposition of mineral scale, the copolymer can be used at levels ranging from about 0.5 to about 100 mg/L. In another embodiment the copolymer can be used at levels from about 3 to about 20 mg/L, and in another embodiment from about 5 to about 10 mg/L.
  • Once prepared, the low molecular weight graft copolymers can be incorporated into an aqueous treatment composition that includes the graft copolymer and other aqueous treatment chemicals. These other chemicals can include, for example, corrosion inhibitors such as orthophosphates, zinc compounds and tolyltriazole. The amount of inventive copolymer utilized in water treatment compositions can vary based upon the treatment level desired for the particular aqueous system treated. Water treatment compositions generally contain from about 0.001 to about 25% by weight of the low molecular weight graft copolymer. In another aspect, the copolymer is present in an amount of about 0.5% to about 5% by weight of the aqueous treatment composition.
  • Low molecular weight graft copolymers according to the present invention can be used in any aqueous system wherein stabilization of mineral salts is important, such as in heat transfer devices, boilers, secondary oil recovery wells, automatic dishwashers, and substrates that are washed with hard water. These graft copolymers can stabilize many minerals found in water, including, but not limited to, iron, zinc, phosphonate, and manganese. These copolymers also disperse particulates found in aqueous systems.
  • Low molecular weight graft copolymers according to the present invention can be used to inhibit scales, stabilize minerals and disperse particulates in many types of processes. Examples of such processes include sugar mill anti-scalant, soil conditioning, treatment of water for use in industrial processes such as mining, oilfields, pulp and paper production, and other similar processes, waste water treatment, ground water remediation, water purification by processes such as reverse osmosis and desalination, air-washer systems, corrosion inhibition, boiler water treatment, as a biodispersant, and chemical cleaning of scale and corrosion deposits. One skilled in the art can conceive of many other similar applications for which the low molecular weight graft copolymer could be useful.
  • Oilfield Application—
  • Scale formation is a major problem in oilfield applications. Subterranean oil recovery operations can involve the injection of an aqueous solution into the oil formation to help move the oil through the formation and to maintain the pressure in the reservoir as fluids are being removed. The injected water, either surface water (lake or river) or seawater (for operations offshore) can contain soluble salts such as sulfates and carbonates. These salts tend to be incompatible with ions already present in the oil-containing reservoir (formation water). The formation water can contain high concentrations of certain ions that are encountered at much lower levels in normal surface water, such as strontium, barium, zinc and calcium. As conditions affecting solubility, such as temperature and pressure, change within the producing well bores and topsides, partially soluble inorganic salts such as barium sulfate and calcium carbonate often precipitate from the production water. This is especially prevalent when incompatible waters are encountered such as formation water, seawater, or produced water.
  • Barium sulfate or other inorganic supersaturated salts such as strontium sulfate can precipitate onto the formation forming scale, thereby clogging the formation and restricting the recovery of oil from the reservoir. These salts can form very hard, insoluble scales that are difficult to prevent. The insoluble salts can also precipitate onto production tubing surfaces and associated extraction equipment, limiting productivity, production efficiency and compromising safety. Certain oil-containing formation waters are known to contain high barium concentrations of 400 ppm and higher. Since barium sulfate forms a particularly insoluble salt, the solubility of which declines rapidly with increasing temperature, it is difficult to inhibit scale formation and to prevent plugging of the oil formation and topside processes and safety equipment.
  • Dissolution of sulfate scales is difficult, requiring high pH, long contact times, heat and circulation, and therefore is typically performed topside. Alternatively, milling and, in some cases, high-pressure water washing can be used. These are expensive, invasive procedures and require process shutdown. Use of low molecular weight graft copolymers according to the present invention can minimize these sulfate scales, especially downhole.
  • There is much pressure on the oil field industry to use biodegradable materials. This is especially true in the North Sea. Biodegradability in oil field applications is typically measured by OECD 306b testing, which is conducted in sea water. If the test sample is found to be greater than 60% biodegradable in 28 days, it is termed to be ‘readily biodegradable’, and if it is found to be greater than 20% biodegradable in 28 days, it is termed to be ‘inherently biodegradable’. Graft copolymers typically derive their biodegradable profile from their hydroxyl-containing natural moiety. Therefore, graft copolymers according to the present invention can have at least about 20% by weight of hydroxyl-containing natural moiety, based on total weight of the graft copolymer. In another aspect, the graft copolymers have at least about 60% by weight. In order to be useful in oil field applications, performance of these graft copolymers should be similar to that of their synthetic counterparts, even with these high levels of hydroxyl-containing natural moieties.
  • Graft copolymers according to the present invention can be used in a number of oil field applications such as cementing, drilling mud, general dispersancy and spacer fluid applications. These applications are described in some detail below.
  • Water encountered in the oilfield can be very brackish. Often, the water encountered in oilfield applications is sea water or brines from the formation. Hence, useful polymers should be soluble in a variety of brines and brackish waters. Brines can be sea water containing, for example, about 3.5% by weight or more NaCl. Severe brines can contain, for example, up to 3.5% by weight KCl, up to 25% by weight NaCl, and/or up to 20% by weight CaCl2. Therefore, in order to be useful, polymers should be soluble in these systems for them to be effective, for example, as scale inhibitors. Typically, the higher the solubility of the graft copolymer in the brine, the higher its compatibility will be.
  • One system frequently encountered in the oilfield is sea water. In one embodiment, graft copolymers according to the present invention are soluble at about 5 to about 1000 ppm levels in sea water. In another aspect these graft copolymers are soluble up to about 10,000 ppm levels. In even another aspect these graft copolymers are soluble up to about 100,000 ppm levels.
  • In one embodiment graft copolymers according to the present invention are soluble at about 5 to about 1000 ppm levels in moderate calcium brine. In one aspect they are soluble up to about 10,000 ppm levels. In even another aspect they are soluble up to about 100,000 ppm levels.
  • In another embodiment graft copolymers according to the present invention are soluble at about 5 to about 1000 ppm levels in severe calcium brine. In one aspect they are soluble up to about 10,000 ppm levels. In another aspect they are soluble up to about 100,000 ppm levels.
  • A number of synthetic anionic polymers are not brine compatible. In contrast, graft copolymers according to the present invention are extremely brine compatible. Without limiting the present invention, it is believed that this is because the hydroxyl-containing natural moiety adds non-ionic character to the graft copolymers, thereby enhancing their compatibility in these brine systems. Graft copolymers according to the present invention can have at least about 20% by weight of the hydroxyl-containing natural moiety, based on total weight of the graft copolymer. In another aspect, the copolymer can have at least about 60% by weight of the hydroxyl-containing natural moiety, based on total weight of the copolymer, for brine compatibility.
  • Typically, the lower the pH of the system, the better is the brine compatibility of the copolymer in that system. However, in most end use conditions the pH of the system is 5 and higher.
  • In one embodiment, for a given level of hydroxyl-containing natural moiety a minimum amount of maleic acid moiety may be required to obtain brine compatibility. When the synthetic component is a mixture of acrylic acid and maleic acid, the maleic acid constituent can be at least about 10 mole % of the synthetic component. In another aspect the maleic acid constituent is at least about 20 mole % of the synthetic component.
  • Compositions of synthetic seawater, moderate and severe calcium brines, which are typical brines encountered in the oilfield, are listed in Table 1 below.
  • TABLE 1
    Typical brines encountered in the oilfield
    Brine Compositions
    Brine number and grams per liter ppm
    description NaCl CaCl2•2H2O MgCl2•6H2O Na Ca Mg
    1 Synthetic seawater 24.074 1.61 11.436 9471 439 1368
    2 Moderate calcium brine 63.53 9.19 24992 2506 0
    3 Severe calcium brine 127.05 91.875 49981 25053 0

    As described in Table 1, sea water contains around 35 grams per liter of a mixture of salts. Moderate and severe calcium brines contain around 70 and 200 grams per liter of a mixture of salts, respectively.
  • Cementing of Oil Wells—
  • A variety of procedures involving hydraulic cement compositions are utilized in the construction and repair of wells such as oil, gas and water wells. For example, in the completion of a well after a well bore has been drilled into one or more subterranean producing formations, a pipe such as casing is disposed in the well bore and a hydraulic cement composition is pumped into the annular space between the walls of the well bore and the exterior of the pipe. The cement composition is allowed to set in the annular space whereby an annular cement sheath is formed therein which bonds the pipe to the walls of the well bore and prevents the undesirable flow of fluids into and through the annular space.
  • In repairing productive wells, hydraulic cement compositions are often utilized to plug holes or cracks in the pipe disposed in the well bore. These compositions can be also used to plug holes, cracks, voids or channels in the aforementioned cement sheath between the pipe and the well bore, as well as to plug permeable zones or fractures in subterranean formations and the like. These holes or cracks are repaired by forcing hydraulic cement compositions thereinto, which then harden and form impermeable plugs.
  • High temperatures are frequently encountered in deep subterranean zones to be cemented. The combination of the depth of the zone and the high temperature thereof often require the setting time of the cement composition to be extended to allow the cement composition pumped into the zone to be cemented. Set retarding additives have been developed and used for this purpose, and such additives can be mixed with well cement compositions in amounts sufficient to delay the setting of the compositions until they can be pumped into desired subterranean locations.
  • Graft copolymers according to the present invention may be used as dispersants, set retarding, fluid loss or gas migration prevention additives in these cementing applications. In one aspect the graft copolymers are made from anionic monomers containing carboxylic acid or phosphonic acid groups. Additionally, non-ionic monomers may be used to improve or enhance performance.
  • Set retarded hydraulic cement compositions of this invention include hydraulic cement, sufficient water to form a slurry of the cement, and a copolymer set-retarding additive as described above. Various hydraulic cements can be utilized in the cement compositions, for example, Portland cement, and can be, for example, one or more of the various types identified as API Classes A-H and J cements. These cements are classified and defined in API Specification for Materials and Testing for Well Cements, API Specification 10A, 21st Edition dated Sep. 1, 1991, of the American Petroleum Institute, Washington, D.C. API Portland cement generally has a maximum particle size of about 90 microns and a specific surface (sometimes referred to as Blaine Fineness) of about 3900 square centimeters per gram. One embodiment of a cement slurry base for use in accordance with this invention includes API Class H Portland cement mixed with water to provide a density of from about 11.3 to about 18.0 pounds per gallon.
  • In one embodiment of the present invention, fine particle size hydraulic cement is utilized. Such cement can include, for example, particles having diameters no larger than about 30 microns (‘μm’) and Blaine Fineness no less than about 6000 square centimeters per gram. In another aspect, the fine cement particles have diameters no larger than about 17 μm. In even another aspect, the particles are no larger than about 11 μm. In one aspect the Blaine Fineness is greater than about 7000 square centimeters per gram. In another aspect the Blaine Fineness is greater than about 10,000 square centimeters per gram. In even another aspect it is greater than about 13,000 square centimeters per gram. Methods of utilizing such fine particle size hydraulic cement in well completion and remedial operations are disclosed, for example, in U.S. Pat. Nos. 5,121,795 and 5,125,455.
  • Water used in cement compositions of this invention can be water from any source provided that it does not contain an excess of compounds which adversely react with or otherwise affect other components in the cement compositions. Water is present in a cement composition of this invention in an amount sufficient to form a slurry of the cement, such as a slurry that is readily pumpable. Generally, water is present in an amount of from about 30% to about 60% by weight of dry cement in the composition when the cement is of normal particle size. When a cement of fine particle size as described above is used, water is present in the cement composition in an amount of from about 100% to about 200% by weight of dry cement in the composition. A dispersing agent such as one described in U.S. Pat. No. 4,557,763 is generally included to facilitate formation of the cement slurry and prevent the premature gelation thereof.
  • Graft copolymers according to the present invention can be included in cement compositions in amounts sufficient to delay or retard setting of the compositions for time periods required to place the compositions in desired locations. When the cement compositions are utilized to carry out completion, remedial and other cementing operations in subterranean zones penetrated by well bores, the compositions must remain pumpable for periods of time long enough to place them in the subterranean zones to be cemented. Thickening and set times of cement compositions can be dependent upon temperature. To obtain optimum results in well applications, a quantity of a copolymer set retarding additive according to the present invention is included in the cement composition so as to provide the necessary pumping time at the temperature encountered downhole. Such quantity can be determined in advance by performing thickening time tests of the type described in the above mentioned API Specification 10A.
  • Generally, an aqueous solution containing a set retarding copolymer of this invention which is about 40% active is combined with a cement slurry. The copolymer is present in the resulting set retarded cement composition in an amount of from about 0.01% to about 5.0% by weight of dry cement in the composition.
  • In addition to set retarding additives, a variety of other additives are often included in well cement compositions. Such other additives are well known to those skilled in the art and are added to well cement compositions to vary composition density, increase or decrease strength, control fluid loss, reduce viscosity, increase resistance to corrosive fluids, and the like. A cement composition meeting the specifications of the American Petroleum Institute is mixed with water and other additives to provide a cement slurry appropriate for the conditions existing in each individual well to be cemented.
  • The methods of this invention for cementing a subterranean zone penetrated by a well bore are basically comprised of the steps of forming a pumpable set retarded cement composition of this invention, pumping the cement composition into the subterranean zone by way of the well bore, and then allowing the cement composition to set therein.
  • Spacer Fluid Compositions—
  • While drilling oil and gas wells, a drilling fluid is circulated through the string of drill pipe, through the drill bit and upwardly to the earth's surface through the annulus formed between the drill pipe and the surface of the well bore, thereby cooling the drill bit, lubricating the drill string and removing cuttings from the well bore. When the desired drilling depth of the well is reached, another “performance” fluid such as slurry containing a cement composition is pumped into the annular space between the walls of the well bore and pipe string or casing. In this process, known as “primary cementing,” the cement composition sets in the annulus, supporting and positioning the casing, and forming a substantially impermeable barrier or cement sheath that isolates the casing from subterranean zones.
  • A spacer fluid is a fluid used to displace a performance fluid such as a drilling fluid in a well bore before introduction into the well bore of another performance fluid, such as a cement slurry. Spacer fluids are often used in oil and gas wells to facilitate improved displacement efficiency when pumping new fluids into the well bore. Spacer fluids are also used to enhance solids removal during drilling operations, to enhance displacement efficiency and to physically separate chemically incompatible fluids. For instance, in primary cementing, the cement slurry is separated from the drilling fluid and partially dehydrated gelled drilling fluid may be removed from the walls of the well bore by a spacer fluid pumped between the drilling fluid and the cement slurry. Spacer fluids may also be placed between different drilling fluids during drilling fluid change outs or between a drilling fluid and a completion brine.
  • The present invention provides improved spacer fluids that can be interposed between the drilling fluid in the wellbore and either a cement slurry or a drilling fluid which has been converted to a cementitious slurry. The spacer fluid serves as a buffer between the drilling fluid and the cement slurry, as well as a flushing agent for evacuating the drilling fluid from the wellbore, thereby resulting in improved displacement efficiency of the drilling fluid removal and improved bonding of the cementitious slurry to surfaces in the wellbore such as the casing or drillpipe wall surfaces.
  • The spacer fluid of the present invention comprises a graft copolymer dispersant and one or more additional components selected from surfactants, viscosifiers and weighting materials to form a theologically compatible fluid between the drilling fluid and the cementitious slurry.
  • The present invention also provides a method of using the spacer fluid. In this method, a spacer fluid having a graft copolymer dispersant is introduced into the wellbore, and a completion fluid, such as cement slurry, is introduced to displace the spacer fluid.
  • Drilling Fluids—
  • Any fluids used in a well bore during drilling operations may be termed a drilling fluids. The term is generally restricted to those fluids that are circulated in the bore hole in rotary drilling. The rotary system of drilling requires the circulation of a drilling fluid in order to remove the drilled cuttings from the bottom of the hole and thus keep the bit and the bottom of the hole clean. Drilling fluids are usually pumped from the surface down through a hollow drill pipe to the bit and the bottom of the hole and returned to the surface through the annular space outside the drill pipe. Any caving from the formations already drilled and exposed in the bore hole must be raised to the surface together with the drill cuttings by mud circulation. The casings and larger drill cuttings are separated from the mud at the surface by flowing the mud through a moving screen of a shale shaker and then settling in mud pits.
  • The flowing drilling fluid cools the bit and the bottom of the hole. The mud usually offers some degree of lubrication between the drill pipe and the wall of the hole. Flows of oil, gas and brines into the well bore are commonly prevented by overbalancing or exceeding formation pressures with the hydrostatic pressure of the mud column.
  • One function of drilling mud is the maintenance and preservation of the hole already drilled. The drilling fluid should permit identification of drill cuttings and identification of any shows of oil or gas in the cuttings. It should also allow for the use of the desired logging materials and other well completion practices. Finally, the drilling fluid should not impair the permeability of any oil or gas bearing formations penetrated by the well.
  • Most drilling fluids are drilling mud, which are suspensions of solids in liquids or in liquid emulsions. The densities of such systems are adjusted to between about 7 and about 21 lbs/gal, or about 0.85 to about 2.5 specific gravity. Where water is used as the liquid phase, the lower limit of the density is about 8.6 to about 9 lbs/gal. In addition to density, other important properties of such suspensions may be adjusted to within suitable limits. Filtration quality may be controlled by having a portion of the solids consist of particles of such small size and nature that very little of the liquid phase will escape through the filter cake of solids formed around the bore hole. Control over viscosity and gel forming character of such suspensions is achieved within limits by the amount and kind of solids in the suspension and by the use of chemicals for reducing the internal resistance of such suspensions so that they will flow easily and smoothly. The vast majority of drilling mud is suspension of clays and other solids in water, and is referred to as water based mud. Oil based mud is suspensions of solids in oil. High flash point diesel oils are commonly used in the liquids phase and the finely dispersed solid is obtained by adding oxidized asphalt. Common weighting agents are used to increase the density. Viscosity and thixotropic properties are controlled by surfactants and other chemicals. Oil based mud is used for special purposes such as preventing the caving of certain shale, as well as completion mud for drilling into sensitive sands that would be damaged by water.
  • Water based mud includes a liquid phase, water and emulsion, a colloidal phase (e.g., clays), an inert phase (e.g., barite weight material and fine sand), and a chemical phase consisting of ions and substances in solution, which influence and control the behavior of colloidal materials such as clays.
  • Colloidal materials produce higher viscosities in a mud for removing cuttings and caving from the hole and for suspending the inert materials such as finely ground barite. An example of one such material is bentonite, which is a rock deposit. The desirable material in the rock is montmorillonite. In addition to yielding viscosity and suspending weight material, these clays produce mud that has low filtration loss. Special clays are used in mud saturated with salt water (e.g., attapulgite). Starch and sodium carboxymethyl cellulose are used as auxiliary colloids for supplementing the mud properties produced by the clays.
  • Inert solids in drilling mud include silica, quartz and other inert mineral grains. These inert materials are finely ground weight material and lost circulation material. A commonly used weight material is barite, which has a specific gravity of 4.3. Barite is a soft mineral and therefore minimizes abrasion on the pump valves and cylinders. It is insoluble and relatively inexpensive and therefore is widely used. Lost circulation materials are added to the mud when losses of whole mud occur in crevices or cracks in exposed rocks in the well bore. Commonly used loss circulation materials include shredded cellophane flakes, mica flakes, cane fibers, wood fibers, ground walnut shells and perlite.
  • The chemical phase of water based mud controls the colloidal phase particularly in the case of bentonite type clays. The chemical phase includes soluble salts which enter the mud from the drill cuttings and the disintegrated portions of the hole and those present in the make up water added to the mud. The chemical phase also includes soluble treating chemicals for reducing viscosity and gel strength of the mud. These chemicals include inorganic materials such as caustic soda, lime, bicarbonate of soda and soda ash. Phosphates such as sodium tetraphosphate may be used to reduce mud viscosities and gel strengths.
  • In addition to clays and barite, the mud system contains calcium sulfate, a fluid loss reducing agent such as sodium carboxymethyl cellulose, and suitable surfactants. Surfactants include a primary surfactant for controlling the rheological properties (viscosity and gelation) of the mud, a defoamer and an emulsifier.
  • Perforation of earthen formations in order to tap subterranean deposits such as gas or oil is accomplished by well drilling tools and a drilling fluid. These rotary drilling systems consist of a drilling bit fitted with appropriate ‘teeth’, a set of pipes assembled rigidly together end to end, wherein the diameter of the piping is smaller than that of the drilling bit. This whole rigid piece of equipment—drill bit and drill pipe string—is driven into rotation from a platform situated above the well. As the drill bit attacks and goes through the geological strata, the crushed mineral materials must be cleared away from the bottom of the hole to enable the drilling operation to continue. Aqueous clay dispersion drilling fluids are recirculated down through the hollow pipe, across the face of the drill bit, and upward through the hole.
  • The drilling fluid cools and lubricates the drill bit, raises the drilling cuttings to the surface of the ground, and seals the sides of the well to prevent loss of water and drilling fluids into the formation through which the drill hole is being bored. After each passage through the well, the mud is passed through a settling tank or trough where sand and drill cuttings are separated, with or without screening. The fluid is then pumped again into the drill pipe by a mud pump.
  • Some of the most serious problems encountered in producing and maintaining effective clay-based aqueous drilling fluids are due to the interaction of the mud with the earth formation being drilled. These interactions include contamination of the mud by formation fluids, incorporation into the mud of viscosity producing and inert drilled solids, chemical contamination by drilled solids, as well as infiltration of sea-water and/or fresh water. The conditions of high temperature and pressure inherent with deeper and deeper drilling operations together with formation interactions make drilling fluid behavior unreliable and difficult to reproduce. Characteristics of an ideal drilling fluid would then include the following:
      • i) To have rheological characteristics as desirable as possible to be able to transport the mineral cuttings set in dispersion.
      • ii) To allow the separation of cuttings by all known means as soon as the mud flows out of the hole.
      • iii) To have such required density as to exert sufficient pressure on the drilled geological formations.
      • iv) To retain its fundamental rheological qualities as it is submitted, in very deep drilling, to higher and higher temperatures.
    Scale Inhibition—
  • Copolymers according to the present invention can be used for scale inhibition where the scale inhibited is, for example, calcium carbonate, halite, calcium sulfate, barium sulfate, strontium sulfate, iron sulfide, lead sulfide and zinc sulfide and mixtures thereof. Halite is the mineral form of sodium chloride, commonly known as rock salt.
  • In most applications, including water treatment and oil field scale inhibition, the copolymers can have greater than 80% inhibition to be effective under practical end use conditions. In one aspect, the copolymers can have greater than 90% inhibition. The amount of copolymer needed to perform at this level depends on the scale to be inhibited. For example, calcium carbonate inhibitors can be be dosed at less than about 50 ppm. In one aspect, calcium carbonate inhibitors can be be dosed at less than about 20 ppm. In even another aspect, calcium carbonate inhibitors can be be dosed at less than about 10 ppm. Barium sulfate inhibitors can be dosed at, for example, less than about 100 ppm. In one aspect, barium sulfate inhibitors can be dosed at less than about 20 ppm. In even another aspect, barium sulfate inhibitors can be dosed at less than about 10 ppm. It is also a major advantage to have the same polymer inhibit more than one type of scale, such as combination of calcium carbonate and barium sulfate, or calcium carbonate and calcium phosphate, at less than about 100 ppm, or, in another aspect, less than 50 ppm. Copolymers of this invention can have to a number average molecular weight of less than 100,000. In another aspect, they can have a number average molecular weight of less than 10,000, and, in even another aspect, less than 5,000.
  • In the oil field scale inhibitors are used in production wells to stop scaling in the reservoir rock formation matrix and/or in the production lines downhole and at the surface. Scaling not only causes a restriction in pore size in the reservoir rock formation matrix (also known as ‘formation damage’), thereby reducing the rate of oil and/or gas production, but also blockage of tubular and pipe equipment during surface processing.
  • In one aspect of the present invention there is provided a method of inhibiting scaling in an aqueous system. This is accomplished by adding a graft copolymer according to the present invention to the aqueous system. The scale inhibitor can be injected, squeezed (as described later on), or added topside to the produced water. The invention is also directed towards a mixture of the graft copolymer and a carrier fluid. Examples of carrier fluid include water, glycol, alcohol or oil. In one aspect the carrier fluid is water, brines or methanol. Methanol is often used to prevent formation of water methane ice structures downhole. In another embodiment of this invention, the graft copolymers of this invention are soluble in methanol. Thus the scale inhibiting polymers can be introduced into the well bore in the methanol line. This is particularly advantageous when there is fixed number of lines that run into the wellbore, thereby eliminating the need for another line. Graft copolymers of this invention can have at least about 10% by weight saccharide functionality, based on total weight of the copolymer, to be soluble in methanol. In another aspect the graft copolymers have at least about 20% by weight saccharide functionality.
  • Examples of aqueous systems include cooling water systems, water flood systems, and produced water systems. The aqueous environment may also be in crude oil systems or gas systems, and may be deployed downhole, topside, pipeline or during refining. The aqueous system may include CO2, H2S, O2, brine, condensed water, crude oil, gas condensate, or any combination of the said or other species. Copolymers of this invention may be deployed continuously or intermittently in a batch-wise manner into the aqueous system.
  • In a preferred embodiment copolymers according to the present invention are added topside and/or in a squeeze treatment. In the latter (also called a “shut-in” treatment) the scale inhibitor is injected into the production well, usually under pressure, “squeezed” into the formation, and held there. In the squeeze procedure the scale inhibitor is injected several feet radially into the production well, where it is retained by adsorption and/or formation of a sparingly soluble precipitate. The inhibitor slowly leaches into the produced water over a period of time and protects the well from scale deposition. The “shut-in” treatment needs to be done regularly (e.g., one or more times a year) if high production rates are to be maintained. The treatment constitutes the “down time” when no production takes place. Copolymers of this invention are particularly good for this type of squeeze scale inhibition due to their saccharide functionality, which can be absorbed onto the formation and released over time.
  • In order to further describe the additives, compositions and methods of this invention and to facilitate a clear understanding thereof, Examples are provided herein below.
  • Dispersant for Particulates—
  • Polymers according to the present invention can be used as a dispersant for minerals in applications such as paper coatings, paints and other coating applications. These particulates are found in a variety of applications, including but not limited to, paints, coatings, plastics, rubbers, filtration products, cosmetics, food and paper coatings. Examples of minerals that can be dispersed by the inventive polymers include titanium dioxide, kaolin clays, modified kaolin clays, calcium carbonates and synthetic calcium carbonates, iron oxides, carbon black, talc, mica, silica, silicates, and aluminum oxide. Typically, the more hydrophobic the mineral the better polymers according to the present invention perform in dispersing particulates.
  • Fiberglass Sizing—
  • In yet even another application, the low molecular weight graft copolymer can be used as a binder for fiberglass. Fiberglass insulation products are generally formed by bonding glass fibers together with a synthetic polymeric binder. Fiberglass is usually sized with phenol-formaldehyde resins or polyacrylic acid based resins. The former has the disadvantage of releasing formaldehyde during end use. The polyacrylic acid resin system has become uneconomical due to rising crude oil prices. Hence, there is a need for renewal sizing materials in this industry. The low molecular weight graft polymers of this invention are a good fit for this application. They can be used by themselves or in conjunction with the with the phenol formaldehyde or polyacrylic acid binder system.
  • The binder composition is generally applied by means of a suitable spray applicator to a fiber glass mat as it is being formed or soon after it is formed and while it is still hot. The spray applicator aids in distributing the binder solution evenly throughout the formed fiberglass mat. The polymeric binder solution tends to accumulate at the junctions where fibers cross each other, thereby holding the fibers together at these junctions. Solids are typically present in the aqueous solution in amounts of about 5 to 25 percent by weight of total solution. The binder can also be applied by other means known in the art, including, but not limited to, airless spray, air spray, padding, saturating, and roll coating.
  • Residual heat from the fibers volatizes water away from the binder. The resultant high-solids binder-coated fiberglass mat is allowed to expand vertically due to the resiliency of the glass fibers. The fiberglass mat is then heated to cure the binder. Typically, curing ovens operate at a temperature of from 130° C. to 325° C. However, the binder composition of the present invention can be cured at lower temperatures of from about 110° C. to about 150° C. In one aspect, the binder composition can be cured at about 120° C. The fiberglass mat is typically cured from about 5 seconds to about 15 minutes. In one aspect the fiberglass mat is cured from about 30 seconds to about 3 minutes. The cure temperature and cure time also depend on both the temperature and level of catalyst used. The fiberglass mat can then be compressed for shipping. An important property of the fiberglass mat is that it returns substantially to its full vertical height once the compression is removed. The low molecular weight graft polymer based binder produces a flexible film that allows the fiberglass insulation to bounce back after a roll is unwrapped for use in walls/ceilings.
  • Fiberglass or other non-wovens treated with the copolymer binder composition is useful as insulation for heat or sound in the form of rolls or batts; as a reinforcing mat for roofing and flooring products, ceiling tiles, flooring tiles, as a microglass-based substrate for printed circuit boards and battery separators; for filter stock and tape stock and for reinforcements in both non-cementatious and cementations masonry coatings.
  • Process for Producing Low Color Graft Copolymers—
  • The present invention provides a process for making graft copolymers at a lighter color. The graft copolymers are made using a redox system of a metal ion and hydrogen peroxide. In another aspect, the graft copolymers are made using free radical initiating systems such as ceric ammonium nitrate and Fe (II)/H2O2 (see, Würzburg, O. B., MODIFIED STARCHES: PROPERTIES AND USES, Grafted Starches, Chpt. 10, pp. 149-72, CRC Press, Boca Raton (1986)). Fe (II) can be substituted with other metal ions such as Cu (II), Co (III), Mn (III) and others. Of these ions, Cu (II) appears to be the most effective and gives low molecular weight products.
  • The amount of metal ions required depends on the metal ion used, the amount of H2O2 used, the monomers to be grafted and the relative amount of natural component to synthetic monomer. To produce low molecular weight graft copolymers, the amount of metal ion needed can exceed 10, and in some cases 100, ppm based on moles of monomer, which is much higher than the 1 to 2 ppm typically used. The amount of metal ion can be given in terms of ppm as moles of the metal ion per total moles of monomer. For example, in the case of Fe (II), 10 ppm or greater moles of Fe based on moles of monomers can be used. In another aspect, 100 ppm or greater moles of Fe based on moles of monomers can be used. For Cu (II), 1 ppm or greater moles of Cu based on moles of monomers can be used. In another aspect, 10 ppm or greater moles of Cu based on moles of monomers can be used. In even another aspect, 100 ppm or greater moles of Cu based on moles of monomers can be used. Higher amounts of metal ion are needed when lower amount of H2O2 are used. In addition, higher levels of the metal ion are needed when the amount of the natural component is high, for example, about 50 weight percent or greater of the total weight of natural component and synthetic monomer. The Cu (II) system is more effective than Fe (II) systems at lowering molecular weight (see, e.g., Examples 2 and 3).
  • As a result of the amount of metal ion used, polymer solutions produced can be extremely dark in color. Color is measured using a Gardner scale. This scale has a series of standards and the color of the test solution is determined by comparing against these standards. The scale goes from 1 to 18, wherein 1 is a very light, almost water white, solution and 18 is an extremely dark tar color solution. For certain applications like detergents, a dark color polymer is aesthetically unattractive to the end user. Therefore, a dark color polymer solution or dry powder is unacceptable. A color of 13 or above on the Gardner scale is considered unacceptable for certain applications such as detergents.
  • According to the process of the present invention, low molecular weight graft copolymers are produced having a Gardner color of 12 or less. Normally, polymerization is carried out at acidic pH, and Fe(II) and hydrogen peroxide are typically used as the initiating system. However, in the present inventive process copper salts can be used instead of iron to produce lower color materials. Also, lower feed times are used to produce products with low color. For example, comonomers like acrylic acid are fed in over a period of 5 to 6 hours to react with the sluggish maleic acid. Lowering the feed times to 3 to 4 hours and using Cu (II) salts such as copper sulfate lowers the color. Finally, in the present process polymerization occurs at low pH. In one aspect, polymerization occurs at a pH of about 6 or below. In another aspect, polymerization occurs at a pH of about 5 or below. In even another aspect, polymerization occurs at a pH of about 3 or below.
  • Monomers such as maleic acid are sluggish in polymerization reactions. They need a certain amount of neutralization to react. They are typically added to the initial charge and neutralized at the same time. This leads to very dark colored materials. It is better to add the maleic in the initial charge. However, the maleic should not be completely neutralized in the initial charge. Caustic needs to be added slowly during the reaction so that the polymerization reaction is carried out under acidic pH conditions. Part of the neutralization agent may be added to the initial charge and the rest may be added in a feed. Alternatively, the maleic acid may be co-fed along with the neutralizing agent such as NaOH. Also, most of the products are neutralized at the end of the reaction. They need to be neutralized to below 6 to maintain a low color.
  • Other methods of producing low molecular weight graft copolymers involve reacting monomers at high temperatures. Typically, the higher the temperature is, the lower the resultant molecular weight. Reaction temperature ranges at ambient pressure can be about 40° C. to 130° C. In another aspect, the temperature range is 80° C. to 100° C. Higher temperatures can be used when the reaction (which is usually in an aqueous medium) occurs at pressures above ambient.
  • EXAMPLES
  • The following examples are intended to exemplify the present invention but are not intended to limit the scope of the invention in any way. The breadth and scope of the invention are to be limited solely by the claims appended hereto.
  • Molecular weights of all the graft copolymers in the Examples below were determined by aqueous Gel Permeation Chromatography (‘GPC’) using a series of polyacrylic acid standards. The method uses 0.05M sodium phosphate (0.025M NaH2PO4 and 0.025M Na2HPO4) buffered at pH 7/0 with NaN3 as the mobile phase. The columns used in this method are: TSKgel PWx1 Guard column, TSKgel; G6000PWx1, G4000PWx1, G3000PWx1, G2500PWx1 set at a temperature of 32° C. Flow rate is 1 mL per minute, and the injection volume is 450 μL. The instrument is calibrated using five different polyacrylic acids standards injected at five different concentrations: PAA1K (2.0 mg/mL), PAA5K (1.75 mg/mL), PAA85K (1.25 mg/mL), PAA495K (0.75 mg/mL), and PAA1700K (0.2 mg/mL), all from American Polymer Standards Corporation.
  • Molecular weight of starting polysaccharides in the Examples below was determined by aqueous Gel Permeation Chromatography (GPC) using a series of hydroxyl ethyl starch standards. The method uses 0.05M sodium phosphate (0.025M NaH2PO4 and 0.025M Na2HPO4) buffered at pH 7/0 with NaN3 as the mobile phase. The columns used in this method are: TSKgel PWx1 Guard column, TSKgel; G6000PWx1, G4000PWx1, G3000PWx1, and G2500PWx1 set at a temperature of 32° C. The flow rate is 1 mL/min and injection volume is 450 μL. The instrument is calibrated using five different hydroxyethyl starch standards injected at five different concentrations: HETA10K (2.0 mg/mL), HETA17K (1.75 mg/mL), HETA40K (1.25 mg/mL), HETA95K (0.75 mg/mL), and HETA205K (0.2 mg/mL), all from American Polymer Standards Corporation.
  • Comparative Example 1
  • Synthesis of Copolymer Using Grafting Recipe Adapted from Example 1 of U.S. Pat. No. 5,227,446 but Limited to Only Acrylic Acid as the Synthetic Component, with the Molar Ratio of Fe and Peroxide Kept the Same—
  • A reactor containing 140 grams of water, 65 grams of maltodextrin (Cargill MD™ 01960 dextrin, having a DE of 11 and a number average molecular weight of 14,851 as determined by aqueous GPC described above) and 0.00075 grams of ferrous ammonium sulfate hexahydrate (‘FAS’) (the level of FAS used in the '446 patent when the moles of monomer used in that example are accounted for, or 0.0019 mmoles FAS and 4 ppm as moles of Fe based on moles of acrylic acid monomer) was heated to 98° C. A solution containing 35 grams of acrylic acid (0.486 moles) in 30 grams of water was added to the reactor over a period of 45 minutes. An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized to a pH of 5 by adding 18 grams of a 50% solution of NaOH. The final product was a clear water white solution having a Gardner color of 1. The number average molecular weight of this polymer was 159,587 as determined by aqueous GPC process noted above.
  • Comparative Example 2
  • Synthesis of Copolymer Using Grafting Recipe Adapted from Example 2 of U.S. Pat. No. 5,227,446—
  • 263.1 g of water, 80 g of maltodextrin (Cargill MD™ 01960, soluble component 90%, DE value of 11 to 14), 63.8 g of maleic anhydride and 0.00075 grams (3.5 g of a 0.1% strength) aqueous FAS solution and 94 g of 50% strength aqueous sodium hydroxide solution are heated to a boil in a heated reactor equipped with stirrer, reflux condenser, thermometer, feed devices, and nitrogen inlet and outlet. The degree of neutralization of maleic acid produced from the maleic anhydride in aqueous solution is 90.2%. When the reaction mixture has started boiling, a solution of 178.2 g of acrylic acid in 141.9 g of water is added over the course of 5 hours, and a solution of 16.6 g of 50% strength hydrogen peroxide in 44.4 g of water is added at a constant rate over the course of 6 hours at the boil. When the addition of acrylic acid is complete, the degree of neutralization of the maleic acid and acrylic acid units present in the polymer is 31.1%. When the addition of hydrogen peroxide is complete, the reaction mixture is heated at the boil for a further 1 hour, neutralized to a pH of 7.2 by adding 180 g of 50% strength aqueous sodium hydroxide solution and cooled.
  • Comparative Example 3
  • Synthesis of Copolymer Using Grafting Recipe Adapted from Example 11 of U.S. Pat. No. 5,227,446—
  • 192 g of water, 146 g of corn starch, 16 g of maleic anhydride and 0.38 g of phosphorus acid are heated to 98° C. in a heated reactor. The reaction product formed a gel ball after 15 minutes. Heating was continued but the gel did not break. This indicates that the starch needs to be degraded and water soluble before the grafting reaction can occur.
  • Comparative Example 4
  • 140 grams of water, 75 grams of maltodextrin (Cargill MD™ 01925 dextrin, having a DE of 25 and a number average molecular weight of 10,867 as determined by aqueous GPC described above) and 0.00075 grams of FAS were heated in a reactor to 98° C. A solution containing 25 grams of acrylic acid in 30 grams of water was added to the reactor over a period of 45 minutes. An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized to a pH of 8 by adding 25 grams of a 50% solution of NaOH. The final product was a clear water white solution having a Gardner color of 1. The number average molecular weight of this polymer was 56,066 as determined by aqueous GPC process noted above.
  • Comparative Example 5
  • 140 grams of water, 65 grams of maltodextrin (Cargill MD™ 01960 dextrin, having a DE of 11 and a number average molecular weight of 14,851 as determined by aqueous GPC described above) and 0.00075 grams of FAS were heated in a reactor to 98° C. A solution containing 35 grams of acrylic acid in 30 grams of water was added to the reactor over a period of 45 minutes. An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized to a pH of 5 by adding 18 grams of a 50% solution of NaOH. The final product was a clear water white solution having a Gardner color of 1. The number average molecular weight of this polymer was 101,340 as determined by aqueous GPC process noted above.
  • Comparative Example 6 Slow Addition of FAS
  • 140 grams of water, 65 grams of maltodextrin (Cargill MD™ 01960 dextrin, having a DE of 11 and a number average molecular weight of 14,851 as determined by aqueous GPC described above) were heated in a reactor to 98° C. A solution containing 35 grams of acrylic acid in 30 grams of water and 0.00075 grams of ferrous ammonium sulfate hexahydrate (‘FAS’) was added to the reactor over a period of 45 minutes. An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized to a pH of 5 by adding 18 grams of a 50% solution of NaOH. The final product was a clear water white solution having a Gardner color of 1. The number average molecular weight of this polymer was 101,340 as determined by aqueous GPC process noted above.
  • Comparative Example 7
  • 140 grams of water, 65 grams of maltodextrin (Cargill MD™ 01918 dextrin, having a DE of 18 and a number average molecular weight of 12,937 as determined by aqueous GPC described above) and 0.00075 grams of FAS were heated in a reactor to 98° C. A solution containing 35 grams of acrylic acid in 30 grams of water was added to the reactor over a period of 45 minutes. An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized to a pH of 5 by adding 18 grams of a 50% solution of NaOH. The final product was a clear water white solution having a Gardner color of 1. The number average molecular weight of this polymer was 125,980 as determined by aqueous GPC process noted above.
  • Comparative Example 8 Increased Level of FAS
  • 140 grams of water, 65 grams of maltodextrin (Cargill MD™ 01960 dextrin, having a DE of 11 and a number average molecular weight of 14,851 as determined by aqueous GPC described above) and 0.0014 grams of FAS were heated in a reactor to 98° C. A solution containing 35 grams of acrylic acid in 30 grams of water was added to the reactor over a period of 45 minutes. An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized to a ph of 5 by adding 18 grams of a 50% solution of NaOH. The final product was a clear water white solution having a Gardner color of 1. The number average molecular weight of this polymer was 88,450 as determined by aqueous GPC process noted above.
  • Comparative Example 9 Increased Level of FAS
  • 140 grams of water, 65 grams of maltodextrin (Cargill MD™ 01960 dextrin, having a DE of 11 and a number average molecular weight of 14,851 as determined by aqueous GPC described above) and 0.002 grams of FAS were heated in a reactor to 98° C. A solution containing 35 grams of acrylic acid in 30 grams of water was added to the reactor over a period of 45 minutes. An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized to a pH of 5 by adding 18 grams of a 50% solution of NaOH. The final product was a clear water white solution having a Gardner color of 1. The number average molecular weight of this polymer was 83,062 as determined by aqueous GPC process noted above.
  • Example 1
  • Low Molecular Weight Copolymer According to the Present Invention Using Increased Level of FAS to Produce the Lower Molecular Weight Polymer.
  • The copolymer in Comparative Example 2 above was reproduced in the same manner with the exception that instead of 0.00075 grams of FAS, 0.075 grams of FAS was used (100 times the level of FAS used in Comparative Example 1, or 0.19 mmoles of FAS and 400 ppm as moles of Fe based on moles of acrylic acid monomer). The final product was a dark amber solution having a Gardner color of 12. The number average molecular weight of this polymer was 5,265 as determined by aqueous GPC. This example illustrates that higher levels of Fe(II) (400 ppm instead of 4) are required to lower the molecular weight compared to Comparative Example 1. However, this leads to darker colored materials as evidenced by the significant jump in Gardner color from 1 to 12.
  • Example 2
  • Low Molecular Weight Copolymer According to the Present Invention Using Increased Level of FAS to Produce the Lower Molecular Weight Polymer
  • The copolymer in Comparative Example 1 above was reproduced in the same manner with the exception that instead of 0.00075 grams of FAS, 0.75 grams of FAS was used (1,000 times the level of FAS used in Comparative Example 1, or 1.9 mmoles FAS and 4000 ppm as moles of Fe based on moles of acrylic acid monomer). The final product was a very dark amber solution having a Gardner color of 18. The number average molecular weight of this polymer was 5,380 as determined by aqueous GPC. (This Mn is within experimental error and may indicate a limit of how low a Mn can be reached with increasing levels of Fe.)
  • Example 3
  • Low Molecular Weight Copolymer According to the Present Invention Using Cu (II) Sulfate Pentahydrate Instead of FAS to Produce the Copolymer
  • The copolymer in Comparative Example 1 above was reproduced in the same manner with the exception that instead of 0.00075 grams of FAS, 0.048 grams of Cu (II) sulfate pentahydrate was used (0.19 mmoles Cu (II) sulfate pentahydrate and 400 ppm as moles of Cu based on moles of acrylic acid monomer, or the same amount of Cu used as Fe used in Example 1). The final product was a clear yellow solution having a Gardner color of 9. The number average molecular weight of this polymer was 3,205 as determined by aqueous GPC. This shows that using Cu instead of Fe produces a lower molecular weight copolymer. Moreover, an acceptable yellow color (Gardner 9 instead of 12), which is much lighter than the dark amber color of Example 1, is obtained by using the Cu salt instead of Fe and neutralizing to a pH of about 5.
  • Example 4
  • Low Molecular Weight Copolymer According to the Present Invention Using Cu (II) Sulfate Pentahydrate Instead of FAS to Produce the Copolymer
  • The copolymer in Comparative Example 2 above was reproduced in the same manner with the exception that instead of 0.00075 grams of FAS, 0.0022 grams of Cu (II) sulfate pentahydrate was used (0.0088 mmoles Cu (II) sulfate pentahydrate, which is the same molar level as the FAS used in Comparative Example 2). The final product was a dark amber solution having a Gardner color of 11. The number average molecular weight of this polymer was 4,865 as determined by aqueous GPC. This shows that using Cu instead of Fe produces a lower molecular weight copolymer.
  • Example 5
  • Low Molecular Weight and Color Acrylic Acid-Maleic Acid Graft Copolymer Using Cu (II) as a Catalyst and Shorter Feed Times to Produce the Copolymer
  • A reactor containing 263.1 grams of water 63.8 grams of maleic anhydride (0.65 moles) and 80 grams of maltodextrin (Cargill MD™ 01960, having a DE of 11 and Mn of 14,851) and 0.0022 grams of Copper (II) sulfate pentahydrate (0.0088 mmoles or 2.8 ppm as moles of Cu based on moles of maleic and acrylic acid, or the same molar level as the FAS used in Comparative Example 2) was heated to 98° C. A solution containing 178.2 grams of acrylic acid (2.47 moles) and 141.9 grams of water was added to the reactor over a period of 2.5 hours. An initiator solution comprising 23.7 grams of 35% hydrogen peroxide solution in 37.3 grams of deionized water was simultaneously added to the reactor over a period of 3 hours. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 180 grams of a 50% solution of NaOH. The final product was a clear light amber solution having a Gardner color of 4. The number average molecular weight of this polymer was 5,323 as determined by aqueous GPC.
  • Example 6
  • Low Molecular Weight Acrylic Acid-Maleic Acid Graft Copolymer Using Cu (II) as a Catalyst and Higher Amounts of Natural Material to Synthetic Monomer.
  • A reactor containing 400 grams of water 100 grams of maleic anhydride (1.02 moles) and 240 grams of maltodextrin (Cargill MD™ 01960, having a DE of 11 and Mn of 14,851) and 0.022 grams of Copper (II) sulfate pentahydrate (0.088 mmoles, or 30 ppm moles of Cu based on moles of maleic and acrylic acid) was heated to 98° C. A solution containing 140 grams of acrylic acid (1.94 moles) and 141.9 grams of water was added to the reactor over a period of 5 hours. The amount of natural component was 50 weight % of total natural component and synthetic monomers. An initiator solution comprising 75 grams of 35% hydrogen peroxide and 25 grams of sodium persulfate dissolved in 80 grams of deionized water was simultaneously added to the reactor over a period of 6 hours. Simultaneously, 75 grams of 50% NaOH dissolved in 100 grams of water was added over 6 hours and 15 minutes so that the maleic acid is partially neutralized during the polymerization process. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 70 grams of a 50% solution of NaOH. The final product was a very dark amber solution with a Gardner color of 17 and a pH of 4.6. The number average molecular weight of this polymer was 1,360 as determined by aqueous GPC. The residual acrylic acid was 546 ppm and the residual maleic acid was 252 ppm.
  • Example 7
  • Low Molecular Weight Acrylic Acid-Maleic Acid Graft Copolymer Using Cu (II) as a Catalyst and Higher Amounts of Natural Material to Synthetic Monomer
  • A reactor containing 400 grams of water, 100 grams of maleic anhydride (1.02 moles) and 300 grams of 80% solution of Cargill Sweet Satin Maltose and 0.022 grams of Copper (II) sulfate pentahydrate (0.088 mmoles, or 30 ppm as moles of Cu based on moles of maleic and acrylic acid) was heated to 98° C. A solution containing 140 grams of acrylic acid (1.94 moles) and 141.9 grams of water was added to the reactor over a period of 5 hours. The amount of natural component was 50 weight % of total natural component and synthetic monomers. An initiator solution comprising 75 grams of 35% hydrogen peroxide and 25 grams of sodium persulfate dissolved in 80 grams of deionized water was simultaneously added to the reactor over a period of 6 hours. Simultaneously, 75 grams of 50% NaOH dissolved in 100 grams of water was added over 6 hours and 15 minutes partially neutralizing the maleic acid during the polymerization process. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 70 grams of a 50% solution of NaOH. The final product was a very dark amber solution having a Gardner color of 18 and a pH of 4.6. The number average molecular weight of this polymer was 1,340 as determined by aqueous GPC. The residual acrylic acid was 588 ppm and the residual maleic acid was 460 ppm.
  • Example 8
  • Low Molecular Low Color Graft Copolymer Comprising 75 Weight % of the Natural Component
  • A reactor containing 120 grams of water and 94 grams of Cargill Sweet Satin Maltose (80% solution) and 0.048 grams of Cu(II) sulfate pentahydrate (0.19 mmoles, of 553 ppm as moles of Cu based on moles of acrylic acid monomer) was heated to 98° C. A solution containing 25 grams of acrylic acid (0.347 moles) and 30 grams of water was added to the reactor over a period of 45 minutes. An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 18 grams of a 50% solution of NaOH (0.225 moles) for a 65% neutralization of the acrylic acid groups. The final product was a clear golden yellow solution with a Gardner color of 7 and a pH of 5.1. The number average molecular weight of this polymer was 2,024 as determined by aqueous GPC. The polymer solution was stable for months with no signs of phase separation.
  • Example 9
  • Low Molecular Low Color Graft Copolymer Using 85 Weight % of the Natural Component
  • A reactor containing 120 grams of water and 106 grams of Cargill Sweet Satin Maltose (80% solution) and 0.048 grams of Cu(II) sulfate pentahydrate (0.19 mmoles, or 923 ppm as moles of Cu based on the moles of acrylic acid monomer) was heated to 98° C. A solution containing 15 grams of acrylic acid (0.208 moles) and 30 grams of water was added to the reactor over a period of 45 minutes. An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 7.5 grams of a 50% solution of NaOH (0.09 moles) for a 45% neutralization of the acrylic acid groups. The final product was a clear golden yellow solution with a Gardner color of 7 and a pH of 4.9. The number average molecular weight of this polymer was 1,255 as determined by aqueous GPC. The polymer solution was stable for months with no signs of phase separation.
  • Example 10
  • Low Molecular Low Color Graft Copolymer Using 95 Weight % of the Natural Component
  • A reactor containing 120 grams of water, 119 grams of Cargill Sweet Satin Maltose (80% solution) and 0.048 grams of Cu(II) sulfate pentahydrate (0.19 mmoles Cu(II) sulfate pentahydrate, or 2736 ppm as moles of Cu based on moles of acrylic acid monomer) was heated to 98° C. A solution containing 5 grams of acrylic acid (0.069 moles) and 30 grams of water was added to the reactor over a period of 45 minutes. An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 2.5 grams of a 50% solution of NaOH (0.031 moles) for a 45% neutralization of the acrylic acid groups. The final product was a clear golden yellow solution having a Gardner color of 7 and a pH of 4.9. The number average molecular weight of this polymer was below the detectable limit of the GPC. The polymer solution was stable for months with no signs of phase separation.
  • Example 11
  • Low Molecular Weight Acrylic Acid-Maleic Acid Graft Copolymer Using Cu (II) as a Catalyst
  • A reactor containing 500 grams of water, 100 grams of maleic anhydride (1.02 moles) and 300 grams of 80% solution of Cargill Sweet Satin Maltose and 75 grams of 50% NaOH and 0.022 grams of Cu (II) sulfate pentahydrate (0.088 mrnmoles, or 30 ppm as moles of Cu based on moles of maleic and acrylic acid) was heated to 98° C. A solution containing 140 grams of acrylic acid (1.94 moles) was added to the reactor over a period of 5 hours. The amount of natural component was 50 weight percent of the natural component and the synthetic monomers. An initiator solution comprising 75 grams of 35% hydrogen peroxide and 25 grams of sodium persulfate dissolved in 80 grams of deionized water was simultaneously added to the reactor over a period of 6 hours. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 70 grams of a 50% solution of NaOH. The fmal product was a very dark amber solution with a Gardner color of 15. The number average molecular weight of this polymer was 4,038 as determined by aqueous GPC.
  • Example 12
  • Low Molecular Weight Graft Copolymer
  • A reactor containing a mixture of 50 grams of maleic anhydride dissolved in 250 grams of water and neutralized with 37.5 grams of a 50% solution of NaOH was heated to 98° C. 150 grams of Cargill Sweet Satin Maltose (65% solution) and 0.011 grams of CuSO4.5H2O was added to the mixture. A monomer solution containing 70 grams of acrylic acid was subsequently added to the reactor over a period of 3 hours and 45 minutes. An initiator solution comprising of 12.5 grams of sodium persulfate and 37.5 grams of a 35% solution of hydrogen peroxide dissolved in 40 grams of water was added to the reactor at the same time as the monomer solution but over a period of 4 hours. The reaction product was held at 98° C. for an additional hour. The final product was a clear light amber solution and had 39% solids.
  • Example 13
  • Low Molecular Weight Graft Copolymer
  • 47 grams of maleic anhydride was dissolved in 172 grams of water and neutralized with 22.5 grams of a 50% solution of NaOH. The mixture was heated to 95° C. and 39.4 grams of DE 11 (Cargill MD™ 01960 dextrin, spray-dried maltodextrin obtained by enzymatic conversion of common corn starch, available from Cargill Inc., Cedar Rapids, Iowa) and 0.02 grams of ferrous ammonium sulfate hexahydrate were added. A monomer solution containing 70 grams of acrylic acid was subsequently added to the reactor over a period of 4 hours. An initiator solution comprising of 4.7 grams of sodium persulfate and 38.7 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water was added to the reactor at the same time and over the same period as the monomer solution. The reaction product was held at 95° C. for 30 minutes. 0.3 grams of erythorbic acid dissolved in 0.6 grams of water and 4 grams of a 41% bisulfite solution were simultaneously added to scavenge the residual monomer. The final product was a clear light amber solution and had 44% solids.
  • Example 14
  • Low Molecular Weight Graft Copolymer
  • 47.3 grams of maleic anhydride was dissolved in 172.6 grams of water and neutralized with 22.5 grams of a 50% solution of NaOH. The mixture was heated to 95 C and 39.4 grams of DE 11(Cargill MD™ 01960) dextrin, spray-dried maltodextrin obtained by enzymatic conversion of common corn starch, available from Cargill Inc., Cedar Rapids, Iowa) and 0.02 grams of ferrous ammonium sulfate hexahydrate was added. A monomer solution containing 70.9 grams of acrylic acid was subsequently added to the reactor over a period of 4 hours. An initiator solution comprising of 4.8 grams of sodium persulfate and 38.7 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water was added to the reactor over a period of 5.5 hours. The reaction product was held at 95° C. for 30 minutes. 0.3 grams of erythorbic acid dissolved in 0.6 grams of water and simultaneously, 4 grams of a 41% bisulfite solution was added to scavenge the residual monomer. The final product was a clear light amber solution and had 35% solids. The number average molecular weight of this polymer as measured by aqueous GPC was 1755.
  • Example 15
  • Low Molecular Weight Graft Copolymer
  • 22 grams of maleic anhydride was dissolved in 172.6 grams of water and neutralized with 22.5 grams of a 50% solution of NaOH. The mixture was heated to 95 C and 102.4 grams of DE 11 (Cargill MD™ 01960 dextrin, spray-dried maltodextrin obtained by enzymatic conversion of common corn starch, available from Cargill Inc., Cedar Rapids, Iowa) and 0.01 grams of ferrous ammonium sulfate hexahydrate was added. A monomer solution containing 33 grams of acrylic acid was subsequently added to the reactor over a period of 5 hours. An initiator solution comprising of 2.4 grams of sodium persulfate and 19.4 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water was added to the reactor over a period of 5.5 hours. The reaction product was held at 95° C. for 30 minutes. 0.3 grams of erythorbic acid dissolved in 0.6 grams of water and simultaneously, 4 grams of a 41% bisulfite solution was added to scavenge the residual monomer. The final product was a clear light amber solution and had 44% solids. The number average molecular weight of this polymer as measured by aqueous GPC was 1280.
  • Example 16 Test for Anti-Redeposition
  • Copolymers from the above Examples were tested for anti-redeposition properties in a generic powdered detergent formulation. The powdered detergent formulation was as follows:
  • Economy Quality Powdered Detergent Formulation
  • Ingredient % active
    BioSoft D-40 5
    Neodol 25-7 5
    Soda Ash 46
    Sodium Silicate 3
    Sodium Sulfate 40
  • The test was conducted in a full scale washing machine using 3 cotton and 3 polyester/cotton swatches. Soil consisting of 17.5 g rose clays 17.5 g bandy black clay and 6.9 g oil blend (75:25 vegetable/mineral) was used. The test was conducted for 3 cycles using 100 g powder detergent per wash load. The polymers were dosed in at 1.0 wt % of the detergent. The wash conditions used were temperature of 33.9° C. (93° F.), 150 ppm hardness and a 10 minute wash cycle.
  • L (luminance), a (color component) and b (color component) values before the first cycle and after the third cycle was measured as L1, a1, b1 and L2, a2, b2, respectively, using a spectrophotometer. Delta whiteness index is calculated using the L, a, b values above.
  • TABLE 2
    Economy Formula Results
    Delta Whiteness
    Index1
    Polymer Mn Cotton Poly/cotton
    Blank (no 11.5 11.4
    polymer)
    Alcospserse 2000 3.12 2.65
    602N2
    Example 1 5265 2.7 1.7
    Example 2 5380 3.3 4.2
    Example 3 3205 4.1 2.9
    Comparative 159,587 12.58 10.25
    Example 1
    Comparative 56,066 7.67 7.90
    Example 4
    Comparative 101,340 13.93 9.70
    Example 5
    Comparative 142,998 11.58 8.09
    Example 6
    Comparative 125,980 9.67 6.99
    Example 7
    Comparative 88,450 12.39 9.75
    Example 8
    Comparative 83,062 12.81 9.81
    Example 9
    1Lower Delta values indicate better anti-redeposition performance.
    2Sodium salt of polyacrylic acid, available from Alco Chemical, Chattanooga, Tennessee.
  • The above data indicates that low molecular weight graft copolymers according to the present invention are far superior to higher molecular weight graft copolymers in anti-redeposition and dispersancy, and are comparable to an industry standard synthetic polymer (here, Alcosperse 602N).
  • Examples 17 to 19 Granular Powder Laundry Detergent Formulations
  • TABLE 3
    Powdered Detergent Formulations
    Example 17 Example 18 Example 19
    Ingredient Wt % Wt % Wt %
    Anionic surfactant 22 20   10.6 
    Non-ionic surfactant 1.5 1.1 9.4
    Cationic surfactant 0.7
    Zeolite 28 24  
    Phosphate 25  
    Silicate 8.5
    Sodium 27 14   9
    carbonate/bicarbonate
    Sulfate 5.4 15   11  
    Sodium silicate 0.6 10  
    Polyamine 4.3 1.9 5  
    Brighteners 0.2 0.2
    Sodium perborate 1  
    Sodium percarbonate 1
    Sodium hypochlorite 1  
    Suds suppressor 0.5 0.5
    Bleach catalyst 0.5
    Polymer of Example 1 1
    Polymer of Example 2 5  
    Polymer of Example 3 2  
    Water and others Balance Balance Balance
  • Example 20 Hard Surface Cleaning Formulations
  • Acid Cleaner
  • Ingredient wt %
    Citric acid (50% solution) 12.0
    Phosphoric acid 1.0
    C12-C15 linear alcohol ethoxylate with 3 moles of EO 5.0
    Alkyl benzene sulfonic acid 3.0
    Polymer of Example 1 1.0
    Water 78.0
  • Alkaline Cleaner
  • Ingredient wt %
    Water 89.0
    Sodium tripolyphosphate 2.0
    Sodium silicate 1.9
    NaOH (50%) 0.1
    Dipropylene glycol monomethyl ether 5.0
    Octyl polyethoxyethanol, 12-13 moles EO 1.0
    Polymer of Example 3 1.0
  • Example 21 Automatic Dishwash Powder Formulation
  • Ingredients wt %
    Sodium tripolyphosphate 25.0
    Sodium carbonate 25.0
    C12-15 linear alcohol ethoxylate with 7 moles of EO 3.0
    Polymer of Example 2 4.0
    Sodium sulfate 43.0
  • Example 22 Automatic Non-Phosphate Dishwash Powder Formulation
  • Ingredients wt %
    Sodium citrate 30
    Polymer of Example 1 10
    Sodium disilicate 10
    Perborate monohydrate 6
    Tetra-acetyl ethylene diamine 2
    Enzymes 2
    Sodium sulfate 30
  • Example 23 Handwash Fabric Detergent
  • Ingredients wt %
    Linear alkyl benzene sulfonate 15-30 
    Nonionic surfactant 0-3 
    Na tripolyphosphate (STPP) 3-20
    Na silicate 5-10
    Na sulfate 20-50 
    Bentonite clay/calcite 0-15
    Polymer of Example 3 1-10
    Water Balance
  • Example 24 Fabric Detergent with Softener
  • Ingredients wt %
    Linear alkylbenzene sulfonate 2
    Alcohol ethoxylate 4
    STPP 23
    Polymer of Example 1 1
    Na carbonate 5
    Perborate tetrahydrate 12
    Montmorillonite clay 16
    Na sulfate 20
    Perfume, FWA, enzymes, water Balance
  • Example 25 Bar/Paste for Laundering
  • Ingredients wt %
    Linear alkylbenzene sulfonate 15-30 
    Na silicate 2-5 
    STPP 2-10
    Polymer of Example 1 2-10
    Na carbonate 5-10
    Calcite 0-20
    Urea 0-2 
    Glycerol 0-2 
    Kaolin 0-15
    Na sulfate 5-20
    Perfume, FWA, enzymes, water Balance
  • Example 26 Liquid Detergent Formulation
  • Ingredients wt %
    Linear alkyl benzene sulfonate 10
    Alkyl sulfate 4
    Alcohol (C12-C15) ethoxylate 12
    Fatty acid 10
    Oleic acid 4
    Citric acid 1
    NaOH 3.4
    Propanediol 1.5
    Ethanol 5
    Polymer of Example 11 1
    Ethanol oxidase 5 u/ml
    Water, perfume, minors up to 100
  • Example 27 Water Treatment Compositions
  • Once prepared, water-soluble polymers are incorporated into a water treatment composition that includes the water-soluble polymer and other water treatment chemicals. Other water treatment chemicals include corrosion inhibitors such as orthophosphates, zinc compounds and tolyl triazole. The level of inventive polymer utilized in water treatment compositions is determined by the treatment level desired for the particular aqueous system treated. Water soluble polymers generally comprise from 10 to 25 percent by weight of the water treatment composition. Conventional water treatment compositions are known to those skilled in the art, and exemplary water treatment compositions are set forth in the four formulations below. These compositions containing the polymer of the present invention have application in, for example, the oil field.
  • Formulation 1 Formulation 2
    11.3% of Polymer of Ex. 1 11.3% Polymer of Ex. 3
    47.7% Water 59.6% Water
     4.2% HEDP  4.2% HEDP
    10.3% NaOH 18.4% TKPP
    24.5% Sodium Molybdate  7.2% NaOH
     2.0% Tolyl triazole  2.0% Tolyl triazole
    pH 13.0 pH 12.64
    Formulation 3 Formulation 4
    22.6% of Polymer of Ex. 2 11.3% Polymer of Ex. 1
    51.1% Water 59.0% Water
     8.3% HEDP  4.2% HEDP
    14.0% NaOH 19.3% NaOH
     4.0% Tolyl triazole  2.0% Tolyl triazole
    pH 12.5  4.2% ZnCl2
    pH 13.2

    where HEDP is 1-hydroxyethylidene-1,1 diphosphonic acid and TKPP is tri-potassium polyphosphate.
  • Example 28 Test for Anti-Redeposition
  • The polymers in Example 4 and Comparative Example 2 were tested for anti-redeposition performance. The data below indicates that the polymer of Example 4 was far superior to that of Comparative Example 2 in anti-redeposition properties. Further, the performance of polymer 4 proved superior to a commercial synthetic Na polyacrylate (Alcosperse 602N), which is an industry standard for this application.
  • One wash anti-redeposition data using commercial Sun liquid detergent. The test protocol is described in Example 4. Lower Delta WI (whiteness index) numbers are better. The data indicate that the low molecular weight graft copolymer of Example 4 produced using the Cu catalyst has superior anti-redeposition properties compared to the graft copolymer of Comparative Example 2 using the same amount of Fe. In fact, Comparative Example 2 polymer performs similar to the control, which does not have any polymer. However, the low molecular weight graft copolymer of this invention performs similar to the industry standard synthetic polyacrylic acid.
  • TABLE 4
    Anti-redeposition Results
    Delta WI (Whiteness Index)
    Cotton Polyester
    Plain Poly/cotton Double Cotton Nylon
    Sample Description weave Plain weave knit Interlock woven
    Control 6.61 5.12 11.31 12.89 3.47
    Alcosperse synthetic Na polyacrylate 4.05 3.53 5.71 8.31 1.62
    602N
    AL 602N synthetic Na polyacrylate 3.75 3.20 3.56 8.84 1.11
    (repeat)
    Example 4 Example 2 of U.S. Pat. No. 2.61 2.92 2.67 7.62 1.41
    5,227,446 repeated using
    Cu(II), (Mn 4865)
    Comparative Example 2 of U.S. Pat. No. 4.34 4.50 8.62 14.54 4.12
    Example 2 5,227,446 using Fe(II)
  • Example 29
  • Low Molecular Weight Maleic Acid Graft Copolymer Using Cu (II) as a Catalyst and Higher Amounts of Natural Material to Synthetic Monomer
  • A reactor containing a mixture of 450 grams of water, 100 grams of maleic anhydride (1.02 moles), 300 grams of 80% solution of Cargill Sweet Satin Maltose, 0.0022 grams of Cu(II) sulfate pentahydrate and 75 grams of a 50% solution of NaOH was heated to 98° C. A solution containing 140 grams of acrylic acid (1.94 moles) in 50 grams of water was added to the reactor over a period of 5 hours. The mole percent of maleic in the synthetic part of the copolymer was 34.4. The amount of natural component was 50 weight percent, based on total weight percent of natural component and synthetic monomers. An initiator solution comprising 52 grams of 35% hydrogen peroxide in 80 grams of deionized water was simultaneously added to the reactor over a period of 4 hours. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 70 grams of a 50% solution of NaOH. The final product was a clear yellow solution with a Gardner color of 8. The number average molecular weight of this polymer was 1,429 as determined by aqueous GPC.
  • Example 30
  • Low Molecular Weight Maleic Acid Graft Copolymer with Very High Amounts of Natural Material to Synthetic Monomer.
  • A reactor containing a mixture of 200 grams of water, 8 grams of maleic anhydride (0.08 moles), 160 grams of Cargill maltodextrin MD 1956 (DE 7.5) and 11.8 grams of a 50% solution of NaOH was heated to 98° C. A shot of 0.0018 grams of ferrous ammonium sulfate hexahydrate was added to the reactor just before monomer and initiator feeds were started. A solution containing 22 grams of acrylic acid (0.31 moles) in 71 grams of water was added to the reactor over a period of 150 minutes. The mole percent of maleic in the synthetic part of the copolymer was 21. The amount of natural component was 84.2 weight percent based on total weight percent of natural component and synthetic monomers. An initiator solution comprising 3 grams of 35% hydrogen peroxide in 22 grams of deionized water was simultaneously added to the reactor over a period of 180 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 10 grams of a 50% solution of NaOH. The number average molecular weight of this polymer was 3,970 as determined by aqueous GPC.
  • Example 31 Calcium Binding/Sequestration
  • The Calcium Binding/Sequestration Properties of a Series of Polymers Were Measured Using the Test Procedure Below—
  • Procedural—
  • Reagent Preparation:
      • 1. Prepare Buffer solution as follows. In a 500 ml flask, dissolve 35 g NH4Cl in 100 ml of DI water. Use a magnetic stir bar and plate to mix while adding 285 ml of NH3 (strong ammonia solution). Bring to 500 ml volume with DI water.
      • 2. Prepare 0.1 M Calcium solution @ pH 10 as follows.
        • Weigh 14.69 g of CaCl2.2H2O into a 500 ml Erlenmeyer flask.
        • Add 200 ml of DI water.
        • Adjust pH of solution to 10 with 1N NaOH or 1:1 HCl.
        • Pour into 1000 ml volumetric flask, add 50 ml Buffer solution pH 10 and bring to 1000 ml volume with DI water.
      • 3. Prepare 0.05M EDTA solution as follows. Dissolve 18.62 g of EDTA disodium salt dihydrate with DI water in a 1000 ml volumetric flask, bringing the total volume to 1000 ml.
  • Procedure for Determination of Calcium Binding Capacity:
      • 1. Weigh approximately 1 g of polymer sample into beaker. Record the exact weight of sample.
      • 2. Pipette 50 ml DI water into beaker and stir for 5 minutes, using magnetic stir bar and stir plate.
      • 3. Pipette 50 ml of calcium solution pH 10 into beaker and stir for 20.
      • 4. Filter the suspension using the funnel and Whatman 1 filter (filtrate).
      • 5. Pipette 50 ml of the filtrate into a 250 ml Erlenmeyer flask. Add 10 ml of the buffer solution pH 10. Mix with magnetic stirrer, and add three drops of 1% Eriochrome Black T as indicator.
      • 6. Titrate with 0.05M EDTA solution until the violet color turns to blue. Record the amount of titrant used.
  • Titration for Calculating Calcium Binding Capacity (CBC):
      • 1. A blank titration must be completed to calculate the Calcium Binding Capacity. Into a 250 ml Erlenmeyer flask pipette 50 ml of the calcium solution and 10 ml of the buffer solution. Stir using a magnetic stirrer and add three drops of Eriochrome Black T solution. Titrate with EDTA solution and record the amount necessary to cause the solution to reach a blue color. This figure will be used in the calculation for CBC.
  • Calculation of CBC:
  • CBC ( mg Ca CO 3 ) @ pH 10 = ( N - 2 S ) ( M EDTA ) ( 100.09 ) Sample weight
      • N=EDTA volume used to perform blank titration (ml)
      • S=EDTA volume used to perform sample titration (ml)
      • M=EDTA concentration
  • The CBC of various polymers was measured using the procedure described above. Grams of CaCO3 sequestered per mole of COOH in the polymer were calculated using the equations below:

  • Moles COOH/g polymer=moles of COOH from maleic anhydride portion+moles of COOH from acrylic acid portion
  • Note: each maleic anhydride group contributes 2 COOH moieties.
  • Moles COOH / g polymer ( B ) = 2 × ( A / 100 ) 98 + ( 100 - A ) / 100 72 g CaCO 3 / Mole COOH in polymer = ( CBC ) / ( B ) × 1000
  • TABLE 5
    Calcium Sequestration
    Wt % of synthetic Mole % maleic
    (Mw) monomers as a part of anhydride in the
    weight the weight of synthetic synthetic g CaCO3/
    average monomer and natural portion of the Moles Ca sequestration Mole
    molecular component in graft graft copolymer COOH/g mg CaCO3/g COOH in
    Example weight copolymer (A) polymer (B) polymer (CBC) polymer
    Alcosperse 602N 100 0 0.0138 300 21.6
    (Commercial
    synthetic
    polyacrylic acid)
    Alcosperse 100 22 0.021 450 21.2
    175(Commercial
    synthetic acrylic-
    maleic
    copolymer)
    Example 3 15 0 0.0021 17 8.2
    Example 11 79.834 75 20.8 0.014 440 38.4
    Example 29 4,213 50 34.4 0.0058 266 45.1
    Example 30 19.961 15.8 21.0 0.0024 132 54.8

    Calcium sequestration is a stoichiometric property and is directly proportional to the moles of acid functionality in the polymer. The data indicates that maleic acid containing graft copolymers have much higher calcium sequestration numbers compared to the synthetic copolymers or the acrylic acid grafts on a molar basis.
  • Example 32
  • Low Molecular Weight Graft Copolymer Using an Oxidized Starch Derivative
  • A reactor containing 140 grams of water, 65 grams of Flomax 8 (oxidized starch having a Mn of 9,891, available from National Starch and Chemical, Bridgewater, N.J.) and 0.00075 grams of FAS was heated to 98° C. A solution containing 35 grams (0.486 moles) of acrylic acid and 30 grams of water was added to the reactor over a period of 45 minutes. An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 35 grams of a 50% solution of NaOH. The final product was an opaque yellow solution. The number average molecular weight of this polymer was 24,373 as determined by aqueous GPC.
  • This polymer was tested according to the anti-redeposition test of Example 4. The data indicates that the polymer did not work as well as the synthetic Na polyacrylate. Nevertheless it was far better than the control which did not have any polymer.
  • TABLE 6
    Anti-Redeposition Results
    Delta Whiteness Delta Whiteness Index
    Polymer Index for Cotton for Poly-Cotton
    Control (None) 10.9 13.6
    Alcosperse 602N 4 2.9
    Example 30 5.5 6.9
  • Example 33 Inhibition of Precipitation
  • The efficacy of various treatments was tested for their ability to prevent the precipitation of calcium carbonate in typical cooling water conditions (a property commonly referred to as the threshold inhibition). This test was developed in correlation with the dynamic testing units, in order to allow for an initially quick screening test of scale threshold inhibitors for cooling water treatment. The ratio of calcium concentration to alkalinity is 1.000:1.448 for the chosen water. This ratio is a fairly accurate average of cooling water conditions found worldwide. One should expect that water wherein the alkalinity is proportionately less will be able to reach higher levels of calcium, and that water containing a proportionally greater amount of alkalinity will reach lower levels of calcium. Since cycle of concentration is a general term, one cycle was chosen, in this case, to be that level at which calcium concentrations equaled 100.0 mg/L Ca as CaCO3 (40.0 mg/L as Ca). The complete water conditions at one cycle of concentration (i.e., make-up water conditions) are as follows:
  • Simulated Make-Up Water Conditions:
      • 100.00 mg/L Ca as CaCO3 (40.0 mg/L as Ca) (one cycle of concentration)
      • 49.20 mg/L Mg as CaCO3 (12.0 mg/L as Mg)
      • 2.88 mg/L Li as CaCO3 (0.4 mg/L Li as Li)
      • 144.80 M Alkalinity (144.0 mg/L as HCO3)
      • 13.40 P Alkalinity (16.0 mg/L as CO3)
  • In dynamic testing (where the pH is about 8.80, bulk water temperature is around 104° F., flow is approximately 3.0 m/s, and heat transfer is approximately 17,000 BTU/hr/ft2), above average threshold inhibitors can reach anywhere from four to five cycles of concentration with this water before significant calcium carbonate precipitation begins. Average threshold inhibitors may only be able to reach three to four cycles of concentration before precipitating, while below average inhibitors may only reach two to three cycles of concentration before precipitation occurs. Polymer performance is generally expressed as percent calcium inhibition. This number is calculated by taking the actual soluble calcium concentration at any given cycle, dividing it by the intended soluble calcium concentration for that same given cycle, and then multiplying the result by 100. Resulting percentage amounts that are below 90% calcium inhibition are considered to be indicators of a significant precipitation of calcium carbonate. However, there are two ways in which an inhibitor can react once their threshold limit is reached. Some lose practically all of their calcium carbonate threshold inhibition properties, falling from 90-100% to below 25% threshold inhibition. Others are able to “hold on” better to their inhibition properties, maintaining anywhere from 50% to 80% threshold inhibition.
  • Testing beyond the threshold limit in order to determine each inhibitor's ability to “hold on” has been found to be a better method of predicting an inhibitors ability to prevent the formation of calcium carbonate in the dynamic testing units. It also allows for greater differentiation in test results. Therefore, a higher cycle (4.0 cycles) was chosen for this test. At this concentration, above average inhibitors should be expected to give better than 60% threshold inhibition. Poor inhibitors should be expected to give less than 20% threshold inhibition, while average inhibitors should fall somewhere in between.
  • Materials:
      • One incubator/shaker, containing a 125 mL flask platform, with 34 flask capacity
      • 34 Screw-cap Erlenmeyer Flasks (125 mL)
      • 1 Brinkmann Dispensette (100 mL)
      • Deionized Water
      • Electronic pipette(s) capable of dispensing between 0.0 mL and 2.5 mL
      • 250 Cycle Hardness Solution*
      • 10,000 mg/L treatment solutions, prepared using known active solids of the desired treatment*
      • 10% and 50% solutions of NaOH
      • 250 Cycle Alkalinity Solution*
      • 0.2 μm syringe filters or 0.2 μm filter membranes
      • 34 Volumetric Flasks (100 mL)
      • Concentrated Nitric Acid *See solution preparations in next section.
  • Solution Preparations:
  • All chemicals used are reagent grade and weighed on an analytical balance to ±0.0005 g of the indicated value. All solutions are made within thirty days of testing. Once the solutions are over thirty days old, they are remade.
  • The hardness, alkalinity, and 12% KCl solutions should be prepared in a one liter volumetric flask using DI water. The following amounts of chemical should be used to prepare these solutions—
  • 250 Cycle Hardness Solution:

  • 10,000 mg/L Ca
    Figure US20080020961A1-20080124-P00001
    36.6838 g CaCl2.2H2O

  • 3,000 mg/L Mg
    Figure US20080020961A1-20080124-P00001
    25.0836 g MgCl2.6H2O

  • 100 mg/L Li
    Figure US20080020961A1-20080124-P00001
    0.6127 g LiCl
  • 250 Cycle Alkalinity Solution:

  • 36,000 mg/L HCO3
    Figure US20080020961A1-20080124-P00001
    48.9863 g NaHCO3

  • 4,000 mg/L CO3
    Figure US20080020961A1-20080124-P00001
    7.0659 g Na2CO3
  • 10,000 mg/L Treatment Solutions:
  • Using percentage of active product in the supplied treatment, a 250 mL of a 10,000 mg/L active treatment solution is made up. This was done for every treatment tested. The pH of the solutions was adjusted to between 8.70 and 8.90 using 50% and 10% NaOH solutions by adding the weighed polymer into a specimen cup or beaker and filling with DI water to approximately 90 mL. The pH of this solution was then adjusted to approximately 8.70 by first adding the 50% NaOH solution until the pH reaches 8.00, and then by using the 10% NaOH until the pH equals 8.70. The solution was then poured into a 250 mL volumetric flask. The specimen cup or beaker was rinsed with DI water and this water added to the flask until the final 250 mL is reached. The formula used to calculate the amount of treatment to be weighed is as follows:
  • Grams of treatment needed = ( 10 , 000 mg / L ) ( 0.25 L ) ( decimal % of active treatment ) ( 1000 mg )
  • Test Setup Procedure:
  • The incubator shaker should be turned on and set for a temperature of 50° C. to preheat. 34 screw cap flasks were set out in groups of three to allow for triplicate testing of each treatment, allowing for testing of eleven different treatments. The one remaining flask was used as an untreated blank. Label each flask with the treatment added.
  • Calibrate the Brinkmann dispensette to deliver 96.6 mL, using DI water, by placing a specimen cup or beaker on an electronic balance and dispensing the water into the container for weighing. Adjust the dispensette accordingly, until a weight of 96.5-96.7 g DI water is delivered. Record this weight and repeat for a total of three measurements and take the average. Once calibrated, dispense the 96.6 mL DI water into each flask.
  • Using a 2.5 mL electric pipette, add 1.60 mL of hardness solution to each flask. This is the amount that will achieve four cycles of make-up water.
  • Using a 250 μL electronic pipette, add 200 μL of desired treatment solution to each flask. This amount will result in a 20 mg/L active treatment dosage. Use a new tip on the electric pipette for each treatment solution so cross contamination does not occur.
  • Using a 2.5 mL electric pipette, add 1.60 mL of alkalinity solution to each flask. This is the amount that will achieve four cycles of make-up water. The addition of alkalinity should be done while swirling the flask, so as not to generate premature scale formation from high alkalinity concentration pooling at the addition site.
  • Prepare one “blank” solution in the exact same manor the above treated solutions were prepared, except add DI water in place of the treatment solution.
  • Place all 34 flasks uncapped onto the shaker platform and close the door. Turn the shaker on at 250 rpm and 50° C. Record the time of entry. The flask should be left in the shaker at these conditions for 17 hours.
  • Prepare a “total” solution in the exact same manor the above treated solutions were prepared, except add DI water in place of both the treatment solution and alkalinity solution. Cap this solution and let sit overnight outside the shaker.
  • Test Analysis Procedure:
  • Once 17 hours have passed, remove the 34 flasks from the shaker and let cool for one hour. Filter each flask solution through a 0.2 μm filter membrane. Analyze this filtrate, directly, for lithium, calcium, and magnesium concentrations by either an Inductively Couple Plasma (ICP) Optical Emission System or Flame Atomic Absorption (AA) system. Also analyze these concentrations in the prepared “total” solution.
  • Calculations of Results:
  • Once the lithium, calcium, and magnesium concentrations are known in all 34 shaker samples and in the “total” solution, the percent inhibition is calculated for each treatment. The lithium is used as a tracer of evaporation in each flask (typically about ten percent of the original volume). The lithium concentration found in the “total” solution is assumed to be the starting concentration in all 34 flasks. The concentrations of lithium in the 34 shaker samples can then each be divided by the lithium concentration found in the “total” sample. These results will provide the multiplying factor for increases in concentration, due to evaporation. The calcium and magnesium concentrations found in the “total” solution are also assumed to be the starting concentrations in all 34 flasks. By multiplying these concentrations by each calculated evaporation factor for each shaker sample, one can determine the final intended calcium and magnesium concentration for each shaker sample. By subtracting the calcium and magnesium concentrations of the “blank” from both the actual and intended concentrations of calcium and magnesium, then dividing the resulting actual concentration by the resulting intended concentration and multiplying by 100, one can calculate the percent inhibition for each treated sample. The triplicate treatments should be averaged to provide more accurate results. A spreadsheet should be set up to make each individual calculation less time consuming.
  • Example:
  • “Total” concentration analysis results:
      • Li=1.61 mg/L
      • Ca=158.0 mg/L
      • Mg=50.0 mg/L
  • “Blank” concentration analysis results:
      • Li=1.78 mg/L
      • Ca=4.1 mg/L
      • Mg=49.1 mg/L
  • Shaker sample concentration analysis results:
      • Li=1.78 mg/L
      • Ca=150.0 mg/L
      • Mg=54.0 mg/L
  • By taking the Li concentration from the shaker sample and dividing by the Li concentration in the “total” sample, one will obtain an evaporation factor of—

  • Figure US20080020961A1-20080124-P00002
    1.78 mg/L/1.61 mg/L=1.11
  • By multiplying the Ca and Mg concentrations in the “total” sample by this factor, one can obtain the final intended concentrations of Ca and Mg in the shaker sample—

  • Ca
    Figure US20080020961A1-20080124-P00003
    1.11×158.0 mg/L=175.4 mg/L Ca

  • Mg
    Figure US20080020961A1-20080124-P00004
    1.11×50.0 mg/L=55.5 mg/L Mg
  • Finally, by subtracting the calcium and magnesium concentrations of the “blank” from both the actual and intended concentrations of calcium and magnesium, then dividing the resulting actual concentrations of Ca and Mg in the shaker sample by the resulting final intended concentrations and multiplying by 100, one can calculate the percent threshold inhibition of calcium and magnesium—

  • Ca
    Figure US20080020961A1-20080124-P00005
    ((150.0 mg/L−4.1 mg/L)/(175.4 mg/L−4.1 mg/L))×100=85.2% Ca inhibition

  • Mg
    Figure US20080020961A1-20080124-P00006
    ((54.0 mg/L−49.1 mg/L)/(55.5 mg/L−49.1 mg/L))×100=76.6% Mg inhibition
  • The polymer of Example 3 was tested in this test at 3 cycles of concentration and compared with a commercial polyacrylate (AQUATREAT 900A from Alco Chemical). The data indicate that the low molecular weight graft copolymer was as good a calcium carbonate inhibitor in this test.
  • TABLE 7
    Precipitant Inhibition
    % inhibition % inhibition
    Polymer at 20 ppm at 10 ppm
    Example 3 100 98
    Aquatreat 900A 100 100
  • Low molecular weight sulfonated graft copolymers are exemplified in U.S. Pat. No. 5,580,941. These materials are made using mercaptan chain transfer agents. Mercaptan chain transfer agents lower the molecular weight, but in the process generate synthetic polymers. These mercaptans stop a growing chain Equation 1 and start a new polymer chain Equation 2, illustrated in the mechanism below (Odian, PRINCIPLES OF POLYMERIZATION, 2nd Ed., John Wiley & Sons, p. 226, New York (1981)). This new chain is now comprised of ungrafted synthetic copolymers.
  • Figure US20080020961A1-20080124-C00001
  • Performance of materials exemplified in U.S. Pat. No. 5,580,941 (‘the '941 patent’) is mainly due to ungrafted synthetic copolymers generated in this process. This is the reason they exemplify relatively low amounts of saccharide (40 wt % or less). Higher amounts of saccharide will phase separate. Secondly, calcium binding data in Table 4 of the '941 patent is inversely proportional to the amount of saccharide functionality. This indicates that the material is mostly a mixture of synthetic copolymer and saccharide with little to no grafting. The saccharide contribution to Ca binding is negligible.
  • TABLE 8
    ‘941 Copolymer Calcium Binding
    Polymer Ca binding from Table 4 Wt % saccharide
    of ‘941 mg CaCO3/g polymer in polymer
    1 1898 30
    2 990 40
    12 >3000 9.7
  • Finally, Comparative Example 5 of the '941 patent forms a precipitate when higher molecular weight saccharide (maltodextrin with DE 20) is used. This illustrates that there is little grafting and the resulting synthetic polymer is phase separating from the maltodextrin. This does not happen with the other examples because disaccharides like sucrose are used, which are small molecules and are compatible.
  • In contrast to the polymers of the '941 patent, graft copolymers of the present invention can have greater than 50 wt % maltodextrin and are compatible, indicating high degree of grafting.
  • Example 34
  • Sulfonated Graft Copolymer with Maltodextrin (Without Mercaptan Chain Transfer Agent)
  • A reactor containing 156 grams of water, 49 grams of maltodextrin (Cargill MD™ 01918 maltodextrin, DE of 18) and 0.0039 grams of FAS was heated to 98° C. A solution containing 81.6 grams of acrylic acid and 129.2 of a 50% solution of sodium 2-acrylamido-2-methyl propane sulfonate (AMPS) was added to the reactor over a period of 45 minutes. An initiator solution comprising 13 grams of 35% hydrogen peroxide solution in 78 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The polymer was then neutralized by adding 27.2 grams of a 50% solution of NaOH. The final product was a clear yellow solution. The number average molecular weight of this polymer was 68,940. This sample remained a clear solution showing no sign of precipitation (phase separation) even after 4 months. In contrast, a blend of Alcosperse 545 (AA-AMPS copolymer) and Cargill MD™ 01918 maltodextrin phase separates within a day. This is similar to the phase separation seen in Comparative Example 5 of the '941 patent where a maltodextrin having a DE of 20 (a lower molecular weight dextrin than that used in our recipe) is used. This clearly indicates that the Example 5 has very little graft copolymer due to the presence of mercaptan, which leads to a lot of synthetic copolymer.
  • Also, a blend of Alcosperse 545 and saccharose or sucrose is phase stable. This is due to the fact that the latter is a small molecule and is very compatible. This supports our assertion that Examples 1, 2 and 12 of the '941 patent are due to the presence of mercaptans are mostly synthetic copolymers blended with the saccharose. The performance of these polymers in the Table above supports this assertion.
  • Example 35
  • CaCO3 Inhibition Performance
  • CaCO3 inhibition performance was evaluated according to NACE™ 3076-2001 standardized test with a few modifications. Our modified test used 30 mL total sample size instead of 100 mL indicated in the method. The polymers were tested at 5, 10 and 15 ppm levels. The samples were tested in triplicate rather than duplicate. The samples were heated in heat block rather than oven or water bath and Ca concentration was determined by ICP.
  • In order to match the sample matrix and dilution for ICP evaluation, the “blank before precipitation” was made by combining 15 mL Ca Brine+15 mL of NaCl Brine plus DI water in place of polymer treatment, and the “blank after precipitation” was made by combining 15 mL Ca Brine+15 mL of Bicarbonate Brine plus DI water instead of polymer.
  • Samples synthesized above were tested in this modified NACE CaCO3 test. Polymers that give 80% or greater inhibition are generally considered good performers for this application. The data is provided in Table 8 below—
  • TABLE 9
    CaCO3 % Inhibition
    wt % Residual NACE CaCO3
    natural:synthetic % (ppm) (% inhibition)
    (mol %) Solids Mw Mn Mw/Mn AA MA 5 ppm 10 ppm 15 ppm
    Aquatreat 93.29
    AR-900A1
    Example 12 50:50 (AA 39.01 2190 1203 1.8 953 2420 79.79 89.57 83.60
    69%, MA 31%)
    Example 50:50 (AA 38.54 7842 1721 4.6 502 1890 86.36 88.61 84.72
    69%, MA 31%)
    1Low molecular weight polyacrylic acid available from Alco Chemical, Chattanooga, TN.
  • Example 36
  • Synthesis of Graft Copolymer
  • 47 grams of maleic anhydride was dissolved in 172 grams of water and neutralized with 22.5 grams of a 50% solution of NaOH. The mixture was heated to 95 C and 39.4 grams of DE 11 (Cargill MD™ 01960 dextrin, spray-dried maltodextrin obtained by enzymatic conversion of common corn starch, available from Cargill Inc., Cedar Rapids, Iowa) and 0.02 grams of ferrous ammonium sulfate hexahydrate was added. A monomer solution containing 70 grams of acrylic acid was subsequently added to the reactor over a period of 4 hours. An initiator solution comprising of 4.7 grams of sodium persulfate and 38.7 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water was added to the reactor at the same time as the monomer solution i.e. over a period of 4 hours. The reaction product was held at 95° C. for 30 minutes. 0.3 grams of erythorbic acid dissolved in 0.6 grams of water and simultaneously, 4 grams of a 41% bisulfite solution was added to scavenge the residual monomer. The final product was a clear light amber solution and had 44% solids.
  • Example 37 Synthesis of Graft Copolymer
  • 47.3 grams of maleic anhydride was dissolved in 172.6 grams of water and neutralized with 22.5 grams of a 50% solution of NaOH. The mixture was heated to 95 C and 39.4 grams of DE 11(Cargill MD™ 01960) dextrin, spray-dried maltodextrin obtained by enzymatic conversion of common corn starch, available from Cargill Inc., Cedar Rapids, Iowa) and 0.02 grams of ferrous ammonium sulfate hexahydrate was added. A monomer solution containing 70.9 grams of acrylic acid was subsequently added to the reactor over a period of 4 hours. An initiator solution comprising of 4.8 grams of sodium persulfate and 38.7 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water was added to the reactor over a period of 5.5 hours. The reaction product was held at 95° C. for 30 minutes. 0.3 grams of erythorbic acid dissolved in 0.6 grams of water and simultaneously, 4 grams of a 41% bisulfite solution was added to scavenge the residual monomer. The final product was a clear light amber solution and had 35% solids. The number average molecular weight of this polymer as measured by aqueous GPC was 1755.
  • Example 38
  • 22 grams of maleic anhydride was dissolved in 172.6 grams of water and neutralized with 22.5 grams of a 50% solution of NaOH. The mixture was heated to 95 C and 102.4 grams of DE 11(Cargill MD™ 01960 dextrin, spray-dried maltodextrin obtained by enzymatic conversion of common corn starch, available from Cargill Inc., Cedar Rapids, Iowa) and 0.01 grams of ferrous ammonium sulfate hexahydrate was added. A monomer solution containing 33 grams of acrylic acid was subsequently added to the reactor over a period of 5 hours. An initiator solution comprising of 2.4 grams of sodium persulfate and 19.4 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water was added to the reactor over a period of 5.5 hours. The reaction product was held at 95° C. for 30 minutes. 0.3 grams of erythorbic acid dissolved in 0.6 grams of water and simultaneously, 4 grams of a 41% bisulfite solution was added to scavenge the residual monomer. The final product was a clear light amber solution and had 44% solids. The number average molecular weight of this polymer as measured by aqueous GPC was 1280.
  • Example 39
  • The samples above were evaluated for barium sulfate inhibition using the procedure below:
  • Part 1: Solution Preparation
    • 1. Prepare Synthetic North Sea seawater (SW) brine.
      • a. Add the following salts to a glass volumetric flask and bring to volume with DI water. Weigh all +/−0.01 grams.
      • b. Buffer SW by adding 1 drop of acetic acid then enough saturated sodium acetate solution to reach pH 6.1. Record amount added.
      • c. Filter brine through 0.45 μm membrane filter under vacuum to remove any dust particles that may affect test reproducibility.
  • TABLE 10
    Salt water brine
    SW
    g/L g/2 L g/3 L record actual
    NaCl 24.074 48.148 72.222
    CaCl2*2H2O 1.57 3.14 4.71
    MgCl2*6H2O 11.436 22.872 34.308
    KCl 0.877 1.754 2.631
    Na2SO4 4.376 8.752 13.128
    grams sodium acetate added

    NOTE: Biological growth occurs in this solution due to sulfate content. Use within 1 week of making.
    • 2. Prepare a standardized Forties formation water (FW) brine.
      • a. Add the following salts to a glass volumetric flask and bring to volume with DI water. Weigh all +/−0.01 grams.
      • b. Buffer SW by adding 1 drop of acetic acid then enough saturated sodium acetate solution to reach pH 6.1. Record amount added.
      • c. Filter brine through 0.45 μm membrane filter under vacuum to remove any dust particles that may affect test reproducibility.
  • TABLE 11
    Forties formation water
    FW
    g/L g/2 L g/3 L record actual
    NaCl 74.167 148.334 222.501
    CaCl2*2H2O 10.304 20.608 30.912
    MgCl2*6H2O 4.213 8.426 12.639
    KCl 0.709 1.418 2.127
    BaCl2*2H2O 0.448 0.896 1.344
    grams sodium acetate added
    • 2. Prepare a 1% (10,000 ppm) active polymer solution for each inhibitor to be tested.
      • a. Weigh indicated grams of polymer into a volumetric flask and bring to volume with buffered, filtered seawater. Grams of polymer (g) required can be calculated by the formula below:

  • g=(V×C)/S
      • where V is volume in mL of volumetric flask, C is concentration of polymer required (as weight %), and S is solids (active) content (in weight %) of the polymer. Example: A polymer has a solids content of 35%. To create 100 mL of a 1 wt % (10,000 ppm) solution:

  • g=(100×1)/35=2.857 g of polymer in 100 mL of seawater
    • 3. Prepare a buffer solution.
      • a. Add 8.2 g anhydrous sodium acetate to 100 g of DI water.
    • 4. Prepare a quenching solution. Since barium sulfate forms readily on cooling, an effective dosage of scale inhibitor is required to prevent further precipitation after the test ends.
      • a. Add 9 g KCl to a 3L volumetric flask. Dissolve with DI water.
      • b. Add 1 active wt % ALCOFLOW 615 (˜67.5 grams).

  • g=(3000×1)/44.4=67.57 g of polymer in 3000 mL
      • c. Bring to volume with DI water.
    Part 2: Test Setup
    • 5. Label 40 mL glass vials with inhibitor name and concentration to be tested and number 1 through max 30 samples. The numbers will indicate the run order for the test.
    • 6. Add 15 mL of DI water to each vial numbered 1-3. These will be used to make the totals.
    • 7. Add 15 mL of SW to each vial numbered 4-30.
    • 8. Label a second set of glass vials with “FW”.
    • 9. Add 15 mL of FW to each vial.
    • 10. Place FW and SW vials in incubator or oven, but do not heat.
    Part 3: Test Period
    • 11. Turn on incubator and set to heat to 80° C.
    • 12. Prepare SW for test. To each SW vial numbered 7-30,
      • a. Add 0.3 mL of sodium acetate buffer solution.
      • b. Add the appropriate amount of scale inhibitor solution to give desired concentration for 30 mL of sample. Microliters (μl) of inhibitor solution required can be calculated by the formula below:

  • μl=[(V 1 ×C 1)/C 2]×1000
      • where V1 is volume in mL of test sample (SW+FW), C1 is concentration of polymer desired (in ppm), and C2 is concentration of active polymer in inhibitor solution. Example: Desired test concentration is 50 ppm in a 30 mL sample size (SW+FW). Using a 10,000 ppm (1%) polymer solution:

  • μl=[(30×50)/10,000]×1000=150 μl
    • 13. To each SW vial numbered 1-6,
      • a. Add 0.3 mL of sodium acetate buffer solution.
      • b. Add an equivalent amount of water in place of the average amount of scale inhibitor solution used to prepare samples.
      • c. Vials 1-3 will be used to determine ppm Ba for totals.
      • d. Vials 4-6 will be used to determine ppm Ba for blanks.
    • 14. Heat solutions for a minimum of 2 hours.
    • 15. At the end of 2 hours take one “FW” vial and #1 labeled SW out of the incubator/oven.
    • 16. Pour the contents of the “FW” vial into the treated SW.
    • 17. Return sample 1 to incubator/oven.
    • 18. Set a timer to begin counting up for 2 hours. (This time period is critical.)
    • 19. When 1 minute has passed, take one “FW” vial and #2 labeled SW out of the incubator/oven.
    • 20. Return sample 2 to incubator/oven.
    • 21. Repeat steps 17-19 with remaining numbered vials, keeping an interval of 1 minute between samples, until each “FW” has been added to a numbered vial.
    • 22. Label a set of test tubes with inhibitor information or run number. These will be used for filtration step.
    • 23. Weigh 5 g+/−0.02 g of quenching solution into each vial.
    Part 4: Filtration
    • 24. When the 2 hour period expires, take vial #1 out of the incubator/oven.
    • 25. Filter ˜5 g (record weight) into previously prepared vial containing quenching solution, ensuring that the labels on the vials match.
      • a. Place open vial containing quenching solution on balance.
      • b. Draw sample into a 5 mL luer-lok syringe.
      • c. Fit syringe with 0.45 μm membrane syringe filter.
      • d. Weigh 5 grams filtrate into vial. Record grams filtrate added (for ppm correction).
    • 26. Repeat this process with each sample at 1 minute intervals, so that each sample has been under test conditions for exactly 2 hours.
    Part 5: ppm Determination
    • 27. Concentration of barium should be determined by ICP. All samples should be run the day of the test.
    • 28. Percent inhibition can be calculated by the following calculation:

  • % inhibition=((S*d)−B/(T−B), where
      • S=ppm Ba in sample
      • d=dilution factor (grams filtrate+5 grams quenching solution)/grams filtrate
      • B=ppm Ba in blank
      • T=ppm Ba in total
    Additional Test Information:
  • TABLE 12
    Sample Matrix
    ppm in samples
    as tested ½ dilution
    Na 20037 10019
    Ca 1619 809
    Mg 936 468
    K 416 208
    Ba 126 63
    SO4 1480 740
    Cl 25142 12571
      • Materials needed:
      • calcium chloride dihydrate
      • sodium chloride
      • magnesium chloride hexahydrate
      • potassium chloride
      • barium chloride dihydrate
      • sodium sulfate
      • acetic acid
      • sodium acetate
      • polymers to be evaluated
      • ALCOFLOW 615
      • Equipment needed:
      • Analytical balance
      • Sample vials
        The data in Table 12 below indicates that these materials are excellent barium sulfate inhibitors and compare well in performance with the synthetic polymers. This is true even when the graft copolymers contain more than 20% (Example 37) and in some cases more than 60% (Example 38) hydroxyl-containing natural moiety. These materials should pass the inherent and readily biodegradable as determined OECD 306b test.
  • TABLE 13
    Barium Sulfate Inhibition
    wt % Residual
    natural:synthetic (ppm) % BaSO4 inhibition
    (mol %) % Solids Mw Mn AA MA 10 ppm 25 ppm 50 ppm
    Aquatreat Acrylic-maleic —*
    978 synthetic
    polymer
    Example 25:75 (MA 35.29 6444 1755 850 1060 64.37 97.36 98.96
    37 33%, AA 67%)
    Example 65:35 (MA 31.16 7372 1280 902 255 16.56 56.03 89.26
    38 33%, AA 67%)
    *Aquatreat 978 (available from Alco Chemical, Chattanooga, TN) precipitates out in the brine used in this test.
  • Example 40
  • The polymer of Example 38 was tested in all 3 of the brines detailed in Table 1. The data indicate that the polymer is very compatible in these brines.
  • TABLE 14
    Brine Compatibility
    Brine 1 Brine 2 Brine 3
    Polymer Observation after Observation after Observation after
    concentration 0 h, 1 h, 24 h, 0 h, 1 h, 24 h, 0 h, 1 h, 24 h,
    Polymer [ppm] 21° C. 60° C. 90° C. 21° C. 60° C. 90° C. 21° C. 60° C. 90° C.
    Example 38 250 Y Y Y Y Y Y Y Y Y
    1000 Y Y Y Y Y Y Y Y Y
    5000 Y Y Y Y Y Y Y Y Y
    25000 Y Y Y Y Y Y Y Y Y
    100000 Y Y Y Y Y Y Y Y Y
    Y Compatible, clear solution
    Uniform haze Hazy solution, no ppt settling
    Redispersable minimal ppt settles, but uniformly redisperses with minimal agitation
    ppt
    X Precipate formed, either crystalline fiber-like structures or gross powder-like ppt
  • By comparison a synthetic acrylate-maleate copolymer (Aquatreat 978 commercially available from Alco Chemical, Chattanooga Tenn.) showed much less brine compatibility as evidenced by the data below.
  • TABLE 15
    Synthetic Brine Compatibility
    Polymer
    concen- Observation after
    tration. Brine 0 h, 1 h, 2 h, 24 h,
    Inhibitor [ppm] Number 21° C. 60° C. 90° C. 90° C.
    Aquatreat 978 250 1 Y Y Y Y
    Aquatreat 978 1000 1 Y Y Y Y
    Aquatreat 978 5000 1 Y Y Y Y
    Aquatreat 978 25000 1 Y Y Y Y
    Aquatreat 978 100000 1 Y Y Y Y
    Aquatreat 978 250 2 Y turbid turbid turbid
    Aquatreat 978 1000 2 Y Y turbid turbid
    Aquatreat 978 5000 2 Y Y turbid turbid
    Aquatreat 978 25000 2 Y Y turbid turbid
    Aquatreat 978 100000 2 Y Y Y Y
    Aquatreat 978 250 3 X X X X
    Aquatreat 978 1000 3 X X X X
    Aquatreat 978 5000 3 X X X X
    Aquatreat 978 25000 3 X X X X
    Aquatreat 978 100000 3 X X X X
  • Example 41
  • Graft Copolymer with 10 Weight Percent Maltodextrin.
  • A reactor containing 150 grams of water, 90 grams of a 50% solution of NaOH, 10 grams of maltodextrin (Cargill MD™ 01960 dextrin) and 0.00075 grams of ferrous ammonium sulfate hexahydrate (‘FAS’) was heated to 98° C. A solution containing 90 grams of acrylic acid was added to the reactor over a period of 45 minutes. An initiator solution comprising 3.6 grams of 35% hydrogen peroxide solution in 30 grams of deionized water was simultaneously added to the reactor over a period of 60 minutes. The reaction product was held at 98° C. for an additional hour. The pH of the polymer solution was 7.
  • The graft copolymer of this Example with low levels of saccharide functionality (10 weight percent) was tested for brine compatibility in Brine 3. This polymer was found to be insoluble in Brine 3 when dosed at 250, 1,000, 5,000, 25,000 and 100,000 ppm levels.
  • Example 42
  • Graft Copolymer with 10 Weight Percent Maltodextrin.
  • 15 grams of maleic anhydride is dissolved in 250 grams of water and 135 grams of a 50% solution of NaOH is heated to 95 C and 10 grams of DE 11(Cargill MD™ 01960) dextrin, spray-dried maltodextrin obtained by enzymatic conversion of common corn starch, available from Cargill Inc., Cedar Rapids, Iowa) and 0.00113 grams of ferrous ammonium sulfate hexahydrate is added. A monomer solution containing 125 grams of acrylic acid is subsequently added to the reactor over a period of 5 hours. An initiator solution comprising of 5.4 grams of sodium persulfate and 45 grams of a 35% solution of hydrogen peroxide dissolved in 12.7 grams of water is added to the reactor over a period of 5.5 hours. The reaction product is held at 95° C. for 60 minutes.
  • The graft copolymer of this Example with low levels of saccharide functionality (10 weight percent) is tested for brine compatibility in Brine 3. The polymer is found to be insoluble in Brine 3 when dosed at 250, 1,000, 5,000, 25,000 and 100,000 ppm levels.
  • Example 43
  • The Polymers Synthesized in Examples 36 and 38 Were Tested for Compatibility in Ethylene Glycol—
  • TABLE
    Ethylene Glycol Compatibility
    Solubility of Solubility of
    the polymer as the polymer as
    a 1% solution a 50% solution
    in ethylene in ethylene
    Polymer glycol glycol
    Example 36 Soluble Soluble
    Example 38 Soluble Soluble
  • This data indicates that polymers of this invention are extremely soluble in ethylene glycol.
  • Although the present invention has been described and illustrated in detail, it is to be understood that the same is by way of illustration and example only, and is not to be taken as a limitation. The spirit and scope of the present invention are to be limited only by the terms of any claims presented hereafter.

Claims (39)

1. Low molecular weight graft copolymer comprising:
a synthetic component formed from at least one or more olefinically unsaturated carboxylic acid monomers or salts thereof, and
a natural component formed from a hydroxyl-containing natural moiety,
wherein the number average molecular weight of the graft copolymer is about 100,000 or less, and
wherein the weight percent of the natural component in the graft copolymer is about 5 wt % or greater based on total weight of the graft copolymer.
2. Graft copolymer according to claim 1 wherein the synthetic component is further formed from one or more monomers having a nonionic, hydrophobic and/or sulfonic acid group,
wherein the one or more monomers are incorporated into the copolymer in an amount of about 50 weight percent or less based on total weight of the graft copolymer.
3. Graft copolymer according to claim 2 wherein the one or more monomers are incorporated into the copolymer in an amount of about 10 weight percent or less based on total weight of the graft copolymer.
4. Graft copolymer according to claim 1 wherein the hydroxyl-containing natural moiety is water soluble.
5. Graft copolymer according to claim 1 wherein the hydroxyl-containing natural moiety is degraded.
6. Graft copolymer according to claim 1 wherein the carboxylic acid monomer is selected from the group consisting of acrylic acid, maleic acid, methacrylic acid and mixtures thereof.
7. Graft copolymer according to claim 5 wherein the carboxylic acid monomer is acrylic acid.
8. Graft copolymer according to claim 5 wherein the carboxylic acid monomer is acrylic acid and maleic acid.
9. Graft copolymer according to claim 1 wherein the weight percent of the natural component in the graft copolymer is about 50 wt % or greater based on total weight of the graft copolymer.
10. Graft copolymer according to claim 1 wherein the natural component is selected from the group consisting of glycerol, citric acid, maltodextrins, pyrodextrins, corn syrups, maltose, sucrose, low molecular weight oxidized starches and mixtures thereof.
11. Cleaning composition comprising the graft copolymer according to claim 1, wherein the copolymer is present in the cleaning composition in an amount of from about 0.01 to about 10 weight %.
12. Cleaning composition comprising the graft copolymer according to claim 1, wherein the cleaning composition further comprises one or more adjuvants.
13. Cleaning composition comprising the graft copolymer according to claim 12, wherein the cleaning composition is a detergent composition, and wherein the graft copolymer has a Gardner color of about 12 or less.
14. Cleaning composition comprising the graft copolymer according to claim 13, wherein the detergent composition is a powdered detergent or unit dose composition.
15. Cleaning composition comprising the graft copolymer according to claim 13, wherein the detergent composition is an autodish composition.
16. Cleaning composition comprising the graft copolymer according to claim 13, wherein the detergent composition is a zero phosphate composition.
17. Method of reducing spotting and/or filming in the rinse cycle of an automatic dishwasher comprising adding to the rinse cycle a rinse aid composition comprising the graft copolymer according to claim 1
18. Method of improving sequestration, threshold inhibition and soil removal in a cleaning composition comprising adding the graft copolymer according to claim 1 to the cleaning composition.
19. Water treatment system comprising the graft copolymer according to claim 1, wherein the graft copolymer is present in the system in an amount of at least about 0.5 mg/L.
20. Method of dispersing and/or minimizing scale in an aqueous system comprising adding the graft copolymer according to claim 1 to a water treatment system.
21. Method of dispersing pigments and/or minerals in an aqueous system comprising adding a dispersant composition comprising the graft copolymer according to claim 1 to the aqueous system.
22. Dispersant composition comprising the graft copolymer according to claim 20, wherein the minerals dispersed comprise titanium dioxide, kaolin clays, modified kaolin clays, calcium carbonates and synthetic calcium carbonates, iron oxides, carbon black, talc, mica, silica, silicates, aluminum oxide or mixtures thereof.
23. Method of dispersing soils and/or dirt from hard and/or soft surfaces comprising treating the hard and/or soft surfaces with a cleaning composition comprising the graft copolymer according to claim 1.
24. Method of dispersing soils and/or dirt in aqueous systems comprising treating the aqueous system with an aqueous treatment composition comprising the graft copolymer according to claim 1.
25. Process for producing low molecular weight graft copolymers having a synthetic component and a natural component, the process comprising:
degrading the natural component to a number average molecular weight of about 100,000 or less,
reacting the natural component with a free radical initiating system having a metal ion to generate free radicals on the natural component, and
polymerizing the free radical-containing natural component with a synthetic component,
wherein the low molecular weight graft copolymer has a Gardner color of about 12 or less.
26. Process according to claim 25 further comprising polymerizing the free radical-containing natural component with the synthetic component at ambient pressure and a reaction temperature of about 40° C. to about 130° C.
27. Process according to claim 25 wherein the metal ion is a Cu (II) salt.
28. Process according to claim 25 wherein polymerization occurs at a pH of about 6 or less.
29. A graft copolymer comprising:
a synthetic component formed from at least one or more olefinically unsaturated carboxylic acid monomers or salts thereof, and
a natural component formed from a hydroxyl-containing natural moiety,
wherein the weight percent of the natural component in the graft copolymer is about 5 wt % or greater based on total weight of the graft copolymer.
30. A cement composition for use in oil field systems comprising the graft copolymer of claim 1, cement, and water.
31. A drilling fluid composition for use in oil field systems comprising the graft copolymer of claim 1, drilling mud and water.
32. A spacer composition for use in oil field systems comprising the graft copolymer of claim 1, at least one surfactant and water.
33. The spacer fluid composition of claim 4 further comprising viscosifiers and weighting materials.
34. A scale inhibition composition for use in water treatment and oil field systems comprising the graft copolymer of claim 1, wherein the number average molecular weight of the graft copolymer is about 100,000 or less.
35. The scale inhibition composition of claim 34 wherein the scale inhibited is calcium carbonate, halite, calcium sulfate, barium sulfate, strontium sulfate, iron sulfide, lead sulfide and zinc sulfide or mixtures thereof.
36. A biodegradable dispersant composition for use in water treatment and oil field systems comprising the graft copolymer of claim 1, wherein the copolymer comprises greater than about 20% by weight, based on total weight of the copolymer, of glycerol, monosaccharide, disaccharide, oligosaccharide, polysaccharide or mixtures thereof as the chain terminating portion of the copolymer.
37. A brine compatible polymer for use in oil field systems comprising the graft copolymer of claim 1, wherein the brine compatible polymer is soluble at a dose of at least 5 ppm in a brine containing at least 35 grams per liter of salt.
38. The brine compatible polymer according to claim 37 wherein the copolymer comprises at least about 20% by weight, based on total weight of the graft copolymer, of glycerol, monosaccharide, disaccharide, oligosaccharide, polysaccharide, or mixtures thereof as the hydroxyl-containing natural moiety of the copolymer.
39. A method of cementing a subterranean zone penetrated by a well bore comprising:
preparing a cement composition comprised of a hydraulic cement, sufficient water to form a slurry and the graft copolymer of claim 1;
placing said cement composition in said subterranean zone; and
allowing said cement composition to set into a hard impermeable mass therein.
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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080020948A1 (en) * 2006-07-21 2008-01-24 Rodrigues Klin A Sulfonated Graft Copolymers
US20090260918A1 (en) * 2008-04-18 2009-10-22 Bangji Cao Panels including renewable components and methods for manufacturing same
US20090260770A1 (en) * 2008-04-18 2009-10-22 Cao Bangii Panels including renewable components and methods for manufacturing
US20090291859A1 (en) * 2008-05-22 2009-11-26 Michael Valls Drilling fluid additive
US20100069280A1 (en) * 2005-07-21 2010-03-18 Akzo Nobel N.V. Hybrid copolymers
US20100081784A1 (en) * 2008-09-26 2010-04-01 Sabic Innovative Plastics Ip Bv Method of making isosorbide polycarbonate
WO2010076291A1 (en) 2008-12-29 2010-07-08 Akzo Nobel N.V. Coated particles of a chelating agent
US20100258310A1 (en) * 2009-04-09 2010-10-14 Simon James Compositions and methods for servicing subterranean wells
US20110046025A1 (en) * 2006-07-21 2011-02-24 Akzo Nobel N.V. Low Molecular Weight Graft Copolymers
US20110132605A1 (en) * 2009-12-08 2011-06-09 Halliburton Energy Services, Inc. Biodegradable Set Retarder For A Cement Composition
WO2011080206A2 (en) 2009-12-28 2011-07-07 Akzo Nobel Chemicals International B.V. Functionalized polyvinyl alcohol films
US20130035276A1 (en) * 2011-08-05 2013-02-07 Ecolab Usa Inc. Cleaning composition containing a polysaccharide graft polymer composition and methods of controlling hard water scale
WO2013022769A1 (en) * 2011-08-05 2013-02-14 Ecolab Usa Inc. Cleaning composition containing a polysaccharide graft polymer composition and methods of controlling hard water scale
US8636918B2 (en) * 2011-08-05 2014-01-28 Ecolab Usa Inc. Cleaning composition containing a polysaccharide hybrid polymer composition and methods of controlling hard water scale
US8765658B2 (en) * 2012-09-12 2014-07-01 Carus Corporation Method for making and using a stable cleaning composition
US8802617B2 (en) * 2012-11-08 2014-08-12 Ecolab Usa Inc. Polyglycerol graft polymers with low concentrations of carboxylic acid containing monomers and their applications
US8841246B2 (en) * 2011-08-05 2014-09-23 Ecolab Usa Inc. Cleaning composition containing a polysaccharide hybrid polymer composition and methods of improving drainage
US20140283708A1 (en) * 2013-03-22 2014-09-25 Pitney Bowes Inc. Concentrate for preparing a sealing solution for sealing mail pieces using tap water and method of making same
US8853144B2 (en) * 2011-08-05 2014-10-07 Ecolab Usa Inc. Cleaning composition containing a polysaccharide graft polymer composition and methods of improving drainage
US20140309392A1 (en) * 2011-11-04 2014-10-16 Akzo Nobel Chemicals International B.V. Graft dendrite copolymers, and methods for producing the same
US8901057B2 (en) * 2012-10-29 2014-12-02 Ecolab Usa Inc. Use of a starch base copolymer in conjunction with a maleic polymer and a hydroxypolycarboxylic acid to control hardness under alkaline conditions
US8945314B2 (en) * 2012-07-30 2015-02-03 Ecolab Usa Inc. Biodegradable stability binding agent for a solid detergent
US9109137B2 (en) 2012-03-30 2015-08-18 ALLNEX Belgium SA Radiation curable (meth) acrylated compounds
US9109068B2 (en) 2005-07-21 2015-08-18 Akzo Nobel N.V. Hybrid copolymer compositions
US9309438B2 (en) 2011-04-05 2016-04-12 ALLNEX Belgium SA Radiation curable compositions
US9365805B2 (en) 2014-05-15 2016-06-14 Ecolab Usa Inc. Bio-based pot and pan pre-soak
US9540310B2 (en) 2012-03-30 2017-01-10 Allnex Belgium S.A. Radiation curable (meth)acrylated compounds
US9950502B2 (en) 2011-12-06 2018-04-24 Basf Se Paper and cardboard packaging with barrier coating
US9988526B2 (en) 2011-11-04 2018-06-05 Akzo Nobel Chemicals International B.V. Hybrid dendrite copolymers, compositions thereof and methods for producing the same
US10160815B2 (en) * 2014-08-14 2018-12-25 Roquette Freres Dextrin copolymer with styrene and an acrylic ester, manufacturing method thereof, and use thereof for paper coating
US20190144730A1 (en) * 2016-12-20 2019-05-16 Saudi Arabian Oil Company Loss Circulation Material for Seepage to Moderate Loss Control
CN116462802A (en) * 2023-06-19 2023-07-21 河北省科学院能源研究所 Environment-friendly scale inhibition dispersing agent and preparation method thereof

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7999040B2 (en) * 2007-09-25 2011-08-16 Nanochem Solutions, Inc. Method of making graft copolymers from sodium poly(aspartate) and the resulting graft copolymer
WO2011159699A2 (en) 2010-06-14 2011-12-22 The Regents Of The University Of Michigan Superhydrophilic and oleophobic porous materials and methods for making and using the same
US8376045B2 (en) 2010-06-17 2013-02-19 Halliburton Energy Services, Inc. Fluid loss additive containing a biodegradable grafted copolymer for a cement composition
US8729006B2 (en) * 2011-06-28 2014-05-20 Ecolab Usa Inc. Methods and compositions using sodium carboxymethyl cellulose as scale control agent
US9309153B2 (en) 2012-04-27 2016-04-12 Halliburton Energy Services, Inc. Wide temperature range cement retarder
US9834459B2 (en) 2012-05-17 2017-12-05 The Regents Of The University Of Michigan Devices and methods for electric field driven on-demand separation of liquid-liquid mixtures
WO2014021902A1 (en) 2012-08-03 2014-02-06 Ecolab Usa Inc. Biodegradable stability binding agent for a solid detergent
US8735336B1 (en) 2013-02-18 2014-05-27 Halliburton Energy Services, Inc. Eco-friendly cleaners for oilfield equipment
US20160060506A1 (en) * 2013-04-05 2016-03-03 Showa Denko K.K. Injection material for fracturing and fluid for fracturing
US9868911B2 (en) 2013-10-09 2018-01-16 The Regents Of The University Of Michigan Apparatuses and methods for energy efficient separations including refining of fuel products
EP3055456A4 (en) 2013-10-10 2017-05-24 The Regents of The University of Michigan Silane based surfaces with extreme wettabilities
WO2015076820A1 (en) * 2013-11-22 2015-05-28 Halliburton Energy Services, Inc. Dual purpose viscosifier-scale inhibitors for use in subterranean formation operations
US9765255B2 (en) 2014-06-06 2017-09-19 The United States Of America As Represented By The Secretary Of The Air Force Surface coatings, treatments, and methods for removal of mineral scale by self-release
RU2017115806A (en) 2014-10-06 2018-11-15 Геркулес Ллк LOW-MOLECULAR GRAVITY POLYMER FOR INHIBITING SEDIMENTATION
RU2017126711A (en) * 2014-12-30 2019-01-31 Эм-Ай Эл.Эл.Си. INCREASING STABILITY OF FLUID FLOW WITH USE OF AGENTS TO REDUCE HYDRAULIC LOSSES AT LOW TEMPERATURES
US10525513B2 (en) 2015-06-26 2020-01-07 Wildfire Construction Llc Construction aggregate from verified remediated spoil
US9694400B2 (en) 2015-06-26 2017-07-04 Wildfire Construction Llc Controlled verified remediation of excavated spoil
CN106749926B (en) * 2016-11-30 2018-09-14 东北林业大学 Improve the additive and its preparation and application of cement mortar bending and compressive strength
DE102016225151A1 (en) 2016-12-15 2018-06-21 Clariant International Ltd Hybrid polymers and use as additives in deep wells
DE102016225147A1 (en) 2016-12-15 2018-06-21 Clariant International Ltd Hybrid polymers and use as additives in deep wells
CN106893569A (en) * 2017-03-01 2017-06-27 徐小虎 A kind of pit shaft de-plugging agent for repairing gas well reservoir permeability
US11162012B2 (en) * 2020-04-06 2021-11-02 Halliburton Energy Services, Inc. Well treatment fluid having biodegradable fluid loss control agent
WO2022076041A1 (en) * 2020-10-07 2022-04-14 Kemira Oyj Tagging agents, anti-scalant polymer compositions, and methods
WO2022093611A1 (en) 2020-10-26 2022-05-05 Ecolab Usa Inc. Calcite scale control agent for geothermal wells
WO2022243533A1 (en) 2021-05-20 2022-11-24 Nouryon Chemicals International B.V. Manufactured polymers having altered oligosaccharide or polysaccharide functionality or narrowed oligosaccharide distribution, processes for preparing them, compositions containing them, and methods of using them
WO2023275269A1 (en) 2021-06-30 2023-01-05 Nouryon Chemicals International B.V. Chelate-amphoteric surfactant liquid concentrates and use thereof in cleaning applications

Citations (96)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2536658A (en) * 1947-03-25 1951-01-02 Hercules Powder Co Ltd Process for preparing nitrocellulose compatible resins from pentaerythritol, an alpha-beta unsaturated dicarboxylic acid and a rosin acid
US3308067A (en) * 1963-04-01 1967-03-07 Procter & Gamble Polyelectrolyte builders and detergent compositions
US3314891A (en) * 1964-05-27 1967-04-18 Wyandotte Chemicals Corp Low foaming detergent
US3442242A (en) * 1967-06-05 1969-05-06 Algonquin Shipping & Trading Stopping and manoeuvering means for large vessels
US3639312A (en) * 1969-02-25 1972-02-01 Dow Chemical Co Olefin polymers containing sugars
US3723322A (en) * 1969-02-25 1973-03-27 Procter & Gamble Detergent compositions containing carboxylated polysaccharide builders
US3803285A (en) * 1971-01-20 1974-04-09 Cpc International Inc Extrusion of detergent compositions
US3933672A (en) * 1972-08-01 1976-01-20 The Procter & Gamble Company Controlled sudsing detergent compositions
US4133779A (en) * 1975-01-06 1979-01-09 The Procter & Gamble Company Detergent composition containing semi-polar nonionic detergent and alkaline earth metal anionic detergent
US4141841A (en) * 1977-07-18 1979-02-27 The Procter & Gamble Company Antistatic, fabric-softening detergent additive
US4260529A (en) * 1978-06-26 1981-04-07 The Procter & Gamble Company Detergent composition consisting essentially of biodegradable nonionic surfactant and cationic surfactant containing ester or amide
US4265779A (en) * 1978-09-09 1981-05-05 The Procter & Gamble Company Suds suppressing compositions and detergents containing them
US4322472A (en) * 1979-12-14 1982-03-30 Alco Standard Corporation Adhesive based on a starch and acrylamide graft copolymer
US4374035A (en) * 1981-07-13 1983-02-15 The Procter & Gamble Company Accelerated release laundry bleach product
US4379080A (en) * 1981-04-22 1983-04-05 The Procter & Gamble Company Granular detergent compositions containing film-forming polymers
US4565647A (en) * 1982-04-26 1986-01-21 The Procter & Gamble Company Foaming surfactant compositions
JPS6131497A (en) * 1984-07-20 1986-02-13 三洋化成工業株式会社 Detergent composition
US4634551A (en) * 1985-06-03 1987-01-06 Procter & Gamble Company Bleaching compounds and compositions comprising fatty peroxyacids salts thereof and precursors therefor having amide moieties in the fatty chain
US4652392A (en) * 1985-07-30 1987-03-24 The Procter & Gamble Company Controlled sudsing detergent compositions
US4830773A (en) * 1987-07-10 1989-05-16 Ecolab Inc. Encapsulated bleaches
US5296470A (en) * 1990-07-02 1994-03-22 Rhone-Poulenc Chimie Graft polysaccharides and their use as sequestering agents
US5304620A (en) * 1992-12-21 1994-04-19 Halliburton Company Method of crosslinking cellulose and guar derivatives for treating subterranean formations
US5378830A (en) * 1993-09-01 1995-01-03 Rhone-Poulenc Specialty Chemicals Co. Amphoteric polysaccharide compositions
US5385959A (en) * 1992-04-29 1995-01-31 Lever Brothers Company, Division Of Conopco, Inc. Capsule which comprises a component subject to degradation and a composite polymer
US5412026A (en) * 1992-01-22 1995-05-02 Rohm And Haas Company High temperature aqueous polymerization process
US5415807A (en) * 1993-07-08 1995-05-16 The Procter & Gamble Company Sulfonated poly-ethoxy/propoxy end-capped ester oligomers suitable as soil release agents in detergent compositions
US5500154A (en) * 1994-10-20 1996-03-19 The Procter & Gamble Company Detergent compositions containing enduring perfume
US5501815A (en) * 1994-09-26 1996-03-26 Ecolab Inc. Plasticware-compatible rinse aid
US5518657A (en) * 1991-11-07 1996-05-21 Ciba-Geigy Corporation Storage-stable formulation of fluorescent whitening mixtures
US5518646A (en) * 1993-04-01 1996-05-21 Lever Industrial Company, Division Of Indopco, Inc. Solid detergent briquettes
US5753770A (en) * 1993-12-23 1998-05-19 Basf Aktiengesellschaft Preparation of hydrogen peroxide, C1 to C4-monopercarboxylic acid and C4- to C18-dipercarboxylic acid complexes in a fluidized-bed process
US5756442A (en) * 1993-06-11 1998-05-26 Henkel Kommanditgesellschaft Auf Aktien Pourable liquid, aqueous cleaning concentrates II
US5869070A (en) * 1994-12-06 1999-02-09 The Procter & Gamble Company Shelf stable skin cleansing liquid with gel forming polymer and lipid
US6020303A (en) * 1996-04-16 2000-02-01 The Procter & Gamble Company Mid-chain branched surfactants
US6022844A (en) * 1996-03-05 2000-02-08 The Procter & Gamble Company Cationic detergent compounds
US6025311A (en) * 1993-12-17 2000-02-15 Aqualon Company Fluid suspension of polysaccharides for personal care and household applications
US6060582A (en) * 1992-02-28 2000-05-09 The Board Of Regents, The University Of Texas System Photopolymerizable biodegradable hydrogels as tissue contacting materials and controlled-release carriers
US6060299A (en) * 1998-06-10 2000-05-09 Novo Nordisk A/S Enzyme exhibiting mannase activity, cleaning compositions, and methods of use
US6060443A (en) * 1996-04-16 2000-05-09 The Procter & Gamble Company Mid-chain branched alkyl sulfate surfactants
US6069122A (en) * 1997-06-16 2000-05-30 The Procter & Gamble Company Dishwashing detergent compositions containing organic diamines for improved grease cleaning, sudsing, low temperature stability and dissolution
US6169062B1 (en) * 1996-12-06 2001-01-02 The Procter & Gamble Company Coated detergent tablet
US6194362B1 (en) * 1996-03-19 2001-02-27 The Procter & Gamble Company Glass cleaning compositions containing blooming perfume
US6221825B1 (en) * 1996-12-31 2001-04-24 The Procter & Gamble Company Thickened, highly aqueous liquid detergent compositions
US6225462B1 (en) * 1998-01-16 2001-05-01 Lever Brothers Company, A Division Of Conopco, Inc. Conjugated polysaccharide fabric detergent and conditioning products
US6231650B1 (en) * 1999-09-17 2001-05-15 Alistagen Corporation Biocidal coating composition
US20020016282A1 (en) * 2000-05-09 2002-02-07 Unilever Home & Personal Care Usa Soil release polymers and laundry detergent compositions containing them
US20020034487A1 (en) * 2000-01-13 2002-03-21 Mireille Maubru Detergent cosmetic compositions comprising a specific amphoteric starch, and uses thereof
US6372708B1 (en) * 1997-11-21 2002-04-16 The Procter & Gamble Company Liquid detergent compositions comprising polymeric suds enhancers
US6376438B1 (en) * 1997-10-30 2002-04-23 Stockhausen Gmbh & Co. Kg Skin-compatible hand cleanser, especially a course hand cleanser
US20020055446A1 (en) * 2000-09-20 2002-05-09 Beatrice Perron Washing composition comprising particles of aluminium oxide, at least one anionic surfactant and at least one amphoteric or nonionic surfactant
US20030008804A1 (en) * 2001-06-05 2003-01-09 Qiu Xu Starch graft copolymer, detergent builder composition including the same, and production method thereof
US20030008793A1 (en) * 2001-05-08 2003-01-09 Osamu Takiguchi Liquid detergent composition
US6537957B1 (en) * 1998-05-15 2003-03-25 The Procter & Gamble Company Liquid acidic hard surface cleaning composition
US20040033929A1 (en) * 2000-10-13 2004-02-19 Werner Bertleff Use of water-soluble or water-dispersible polyether blocks cotaining graft polymers as coating for washing, cleaning and for the treatment of laundry
US20040033939A1 (en) * 2002-05-24 2004-02-19 Daniel Marquess Cross-linked glycopeptide-cephalosporin antibiotics
US20040039137A1 (en) * 2000-11-21 2004-02-26 Klaus Heinemann Method for producing meltable polyesters
US20040048760A1 (en) * 2001-03-23 2004-03-11 Ecolab Inc. Methods and compositions for cleaning, rinsing, and antimicrobial treatment of medical equipment
US20040067865A1 (en) * 2001-02-15 2004-04-08 Ian Harrison Use of non-ionic polysaccharides in a composition for textile care
US20040067864A1 (en) * 2000-12-28 2004-04-08 Eric Aubay Use of amphoteric polysaccharide for treating textile fibre articles
US20040071742A1 (en) * 2002-10-10 2004-04-15 Popplewell Lewis Michael Encapsulated fragrance chemicals
US20050019352A1 (en) * 2001-12-11 2005-01-27 Jean-Michel Mercier Method for preparing a water/oil/water multiple emulsion
US20050028293A1 (en) * 2002-09-09 2005-02-10 Cedric Geffroy Rinsing formulation for textiles
US20060019858A1 (en) * 2004-07-20 2006-01-26 Unilever Home & Personal Care Usa, Division Of Conopco, Inc. Mild, moisturizing sulfosuccinate cleansing compositions
US20060019847A1 (en) * 2004-07-20 2006-01-26 Unilever Home & Personal Care Usa, Division Of Conopco, Inc. Mild, moisturizing cleansing compositions with improved storage stability
US20060024353A1 (en) * 2004-01-08 2006-02-02 Gerard Trouve Novel porous film-forming granules, process for their preparation and application in the film coating of tablets and sweets
US20060029561A1 (en) * 2004-08-03 2006-02-09 Euen Gunn Polysaccharide graft copolymers and their use in personal care applications
US7012048B2 (en) * 2003-02-11 2006-03-14 National Starch And Chemical Investment Holding Corporation Composition and method for treating hair containing a cationic ampholytic polymer and an anionic benefit agent
US7157413B2 (en) * 2002-07-08 2007-01-02 L'oreal Detergent cosmetic compositions comprising an anionic surfactant, an amphoteric, cationic, and/or nonionic surfactant, and a polysacchardie, and use thereof
US20070015678A1 (en) * 2005-07-15 2007-01-18 Rodrigues Klin A Modified Polysaccharides
US20070021577A1 (en) * 2005-07-21 2007-01-25 National Starch And Chemical Investment Holding Corporation Hybrid copolymers
US20070054816A1 (en) * 2004-05-05 2007-03-08 Damien Berthier Biodegradable grafted copolymers
US20070056900A1 (en) * 2003-09-19 2007-03-15 Basf Aktiengesellschaft Use of copolymers containing n-vinyl lactam for producing functionalized membranes
US20080021168A1 (en) * 2006-07-21 2008-01-24 National Starch And Chemical Investment Holding Corporation Low molecular weight graft copolymers
US20080021167A1 (en) * 2006-07-21 2008-01-24 National Starch And Chemical Investment Holding Co Sulfonated graft copolymers
US20090011973A1 (en) * 2007-07-02 2009-01-08 Ecolab Inc. Solidification matrix including a salt of a straight chain saturated mono-, di-, and tri- carboxylic acid
US20090011214A1 (en) * 2007-07-02 2009-01-08 Yin Wang Polymeric Composition for Cellulosic Material Binding and Modifications
US20090023625A1 (en) * 2007-07-19 2009-01-22 Ming Tang Detergent composition containing suds boosting co-surfactant and suds stabilizing surface active polymer
US20090062175A1 (en) * 2007-08-31 2009-03-05 Laura Cermenati Liquid acidic hard surface cleaning composition
US20090087390A1 (en) * 2007-09-27 2009-04-02 Modi Jashawant J Fluidized slurry of water soluble and or water-swellable polymer and mixture thereof (FPS) for use in dentifrice and household applications
US20100008870A1 (en) * 2006-02-28 2010-01-14 Appleton Papers Inc. Benefit agent containing delivery particle
US7670388B2 (en) * 2005-10-14 2010-03-02 Kao Corporation Fiber-treating composition
US20100056413A1 (en) * 2008-09-04 2010-03-04 Harry Jr David Ray high-temperature cleaning system, associated substrates, and associated methods
US20100075879A1 (en) * 2008-09-19 2010-03-25 The Procter & Gamble Company Detergent Composition Containing Suds Boosting and Suds Stabilizing Modified Biopolymer
US20100075887A1 (en) * 2008-09-19 2010-03-25 The Procter & Gamble Company Attention: Chief Patent Counsel Dual Character Polymer Useful in Fabric Care Products
US20100075880A1 (en) * 2008-09-19 2010-03-25 The Procter & Gamble Company Dual Character Biopolymer Useful in Cleaning Products
US20100086575A1 (en) * 2006-02-28 2010-04-08 Jiten Odhavji Dihora Benefit agent containing delivery particle
US20100093584A1 (en) * 2008-10-09 2010-04-15 Hercules Incorporated Cleansing Formulations Comprising Non-Cellulosic Polysaccharide With Mixed Cationic Substituents
US20110017945A1 (en) * 2009-07-27 2011-01-27 Ecolab Inc. Novel formulation of a ware washing solid controlling hardness
US20110021410A1 (en) * 2009-07-27 2011-01-27 Ecolab Usa Inc. Novel formulation of a ware washing solid controlling hardness
US20110028371A1 (en) * 2009-07-31 2011-02-03 Akzo Nobel N.V. Hybrid copolymers
US20110034622A1 (en) * 2008-04-01 2011-02-10 Kansai Paint Co., Ltd. Aqueous dispersion and aqueous coating composition, and process of forming coating film
US7902276B2 (en) * 2006-08-31 2011-03-08 Harima Chemicals, Inc. Surface sizing agent and use thereof
US20130035274A1 (en) * 2011-08-05 2013-02-07 Ecolab Usa Inc. Cleaning composition containing a polysaccharide hybrid polymer composition and methods of controlling hard water scale
US20130035277A1 (en) * 2011-08-05 2013-02-07 Ecolab Usa Inc. Cleaning composition containing a polysaccharide hybrid polymer composition and methods of improving drainage
US20130035273A1 (en) * 2011-08-05 2013-02-07 Ecolab Usa Inc. Composition containing a polysaccharide hybrid polymer and methods of controlling hard water scale
US20130035276A1 (en) * 2011-08-05 2013-02-07 Ecolab Usa Inc. Cleaning composition containing a polysaccharide graft polymer composition and methods of controlling hard water scale

Family Cites Families (133)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798053A (en) 1952-09-03 1957-07-02 Goodrich Co B F Carboxylic polymers
NL211637A (en) 1955-10-27
NL6503229A (en) 1965-03-13 1966-09-14
NL136759C (en) 1966-02-16
US3518176A (en) 1966-02-25 1970-06-30 Us Agriculture Graft polymerization of starch in novel alcohol reaction medium
GB1157300A (en) 1966-05-11 1969-07-02 Minoru Imoto A process for preparing a Graft-Copolymerised Cellulose
US3629121A (en) 1969-12-15 1971-12-21 Ibrahim A Eldib Carboxylated starches as detergent builders
US3673148A (en) 1971-05-20 1972-06-27 Du Pont Abrasion resistant coating composition of an acrylic polymer, a polyester and a thermosetting constituent
DE2324190A1 (en) 1973-05-12 1974-11-28 Volkswagenwerk Ag PROCEDURE FOR OPERATING AN COMBUSTION MACHINE AND COMBUSTION MACHINE USING THIS PROCEDURE
US3929678A (en) 1974-08-01 1975-12-30 Procter & Gamble Detergent composition having enhanced particulate soil removal performance
US4228042A (en) 1978-06-26 1980-10-14 The Procter & Gamble Company Biodegradable cationic surface-active agents containing ester or amide and polyalkoxy group
US4239660A (en) 1978-12-13 1980-12-16 The Procter & Gamble Company Detergent composition comprising a hydrolyzable cationic surfactant and specific alkalinity source
US4483779A (en) 1982-04-26 1984-11-20 The Procter & Gamble Company Detergent compositions comprising polyglycoside and polyethoxylate surfactants and anionic fluorescer
US4483780A (en) 1982-04-26 1984-11-20 The Procter & Gamble Company Detergent compositions containing polyglycoside and polyethoxylate detergent surfactants
US4412934A (en) 1982-06-30 1983-11-01 The Procter & Gamble Company Bleaching compositions
US4597898A (en) 1982-12-23 1986-07-01 The Proctor & Gamble Company Detergent compositions containing ethoxylated amines having clay soil removal/anti-redeposition properties
GB8304990D0 (en) 1983-02-23 1983-03-30 Procter & Gamble Detergent ingredients
IE81141B1 (en) 1983-06-24 2000-04-05 Genencor Int Procaryotic carbonyl hydrolases
US4671891A (en) 1983-09-16 1987-06-09 The Procter & Gamble Company Bleaching compositions
US4539130A (en) 1983-12-22 1985-09-03 The Procter & Gamble Company Peroxygen bleach activators and bleaching compositions
US4681704A (en) 1984-03-19 1987-07-21 The Procter & Gamble Company Detergent composition containing semi-polar nonionic detergent alkaline earth metal anionic detergent and amino alkylbetaine detergent
US4605721A (en) 1984-04-30 1986-08-12 Eastman Kodak Company Novel graft copolymers and process for the preparation thereof
US4557763A (en) 1984-05-30 1985-12-10 Halliburton Company Dispersant and fluid loss additives for oil field cements
GB8415909D0 (en) 1984-06-21 1984-07-25 Procter & Gamble Ltd Peracid compounds
GB8422158D0 (en) 1984-09-01 1984-10-03 Procter & Gamble Ltd Bleach compositions
US4702857A (en) 1984-12-21 1987-10-27 The Procter & Gamble Company Block polyesters and like compounds useful as soil release agents in detergent compositions
US4606838A (en) 1985-03-14 1986-08-19 The Procter & Gamble Company Bleaching compositions comprising alkoxy substituted aromatic peroxyacids
US4690996A (en) * 1985-08-28 1987-09-01 National Starch And Chemical Corporation Inverse emulsions
US4686063A (en) 1986-09-12 1987-08-11 The Procter & Gamble Company Fatty peroxyacids or salts thereof having amide moieties in the fatty chain and low levels of exotherm control agents
DE3714732C3 (en) 1987-05-02 1994-07-14 Grillo Werke Ag Copolymers based on unsaturated carboxylic acids and monosaccharides capable of enolate formation, process for their preparation and their use
DE3801633A1 (en) 1988-01-21 1989-07-27 Starchem Gmbh PROCESS FOR PREPARING WATER ABSORBING AND WATER-SOILABLE POLYSACCHARIDE POLYPERS
US4968451A (en) 1988-08-26 1990-11-06 The Procter & Gamble Company Soil release agents having allyl-derived sulfonated end caps
IT1230862B (en) 1989-06-06 1991-11-08 Ausidet Spa WATER SOLUBLE COPOLYMERS OF MALEIC ANHYDRIDE.
EP0405917A1 (en) 1989-06-26 1991-01-02 Sequa Chemicals Inc. Starch polymer graft
DE3922784A1 (en) 1989-07-11 1991-01-17 Synthomer Chemie Gmbh METHOD FOR PRODUCING AQUEOUS, DEXTRINE-CONTAINING POLYMERISATE DISPERSIONS
NL9001027A (en) 1990-04-27 1991-11-18 Tno PROCESS FOR PREPARING POLYACARBOXY-BASED CALCIUM-BINDING POLYCARBOXY COMPOUNDS, AND PHOSPHATE REPLACEMENTS FOR DETERGENTS BASED ON THESE POLYCARBOXY COMPOUNDS.
US5071895A (en) 1990-01-18 1991-12-10 Rohm And Haas Company Functionally terminated acrylic acid telomers
DE4003172A1 (en) 1990-02-03 1991-08-08 Basf Ag PFROPOPOPOLYMERISATES OF MONOSACCHARIDES, OLIGOSACCHARIDES, POLYSACCHARIDES AND MODIFIED POLYSACCHARIDES, PROCESS FOR THEIR PREPARATION AND THEIR USE
US5248449A (en) 1990-03-27 1993-09-28 W. R. Grace & Co.-Conn. Emulsion breaking using cationic quaternary ammonium starch/gums
FR2663948B1 (en) * 1990-07-02 1994-06-03 Rhone Poulenc Chimie DETERGENT COMPOSITION CONTAINING A BIODEGRADABLE GRAFT POLYSACCHARIDE.
BR9106912A (en) 1990-09-28 1993-07-20 Procter & Gamble POLYHYDROXY FATTY ACID STARCHES IN DETERGENT COMPOSITES CONTAINING DIRT RELEASE AGENTS
DE4038908A1 (en) 1990-12-06 1992-06-11 Basf Ag USE OF WATER-SOLUBLE GRAFTED NATURALS AS WATER TREATMENT AGENTS
US5121795A (en) 1991-01-08 1992-06-16 Halliburton Company Squeeze cementing
US5125455A (en) 1991-01-08 1992-06-30 Halliburton Services Primary cementing
DE4125752A1 (en) 1991-08-03 1993-02-04 Basf Ag POLYMERISATES FROM ETHYLENICALLY UNSATURATED, N-CONTAINING COMPOUNDS, POLYMERIZED IN THE PRESENCE OF MONOSACCHARIDES, OLIGOSACCHARIDES, POLYSACCHARIDES OR THEIR DERIVATIVES
DE4127733A1 (en) 1991-08-22 1993-02-25 Basf Ag Graft polymers of natural substances containing saccharide structures or derivatives thereof and ethylenically unsaturated compounds and their use.
US5741875A (en) 1991-11-08 1998-04-21 Meister; John J. Biodegradable plastics and composites from wood
DE4221381C1 (en) 1992-07-02 1994-02-10 Stockhausen Chem Fab Gmbh Graft copolymers of unsaturated monomers and sugars, process for their preparation and their use
FR2693104B1 (en) 1992-07-03 1994-09-09 Oreal Cosmetic composition based on maltodextrin for maintaining and / or fixing the hairstyle.
DE4239076A1 (en) * 1992-11-20 1994-05-26 Basf Ag Mixtures of polymers of monoethylenically unsaturated dicarboxylic acids and polymers of ethylenically unsaturated monocarboxylic acids and / or polyaminocarboxylic acids and their use
US5264470A (en) * 1992-12-30 1993-11-23 Halliburton Company Set retarding additives, cement compositions and methods
EP0719321B2 (en) 1993-09-14 2009-03-25 The Procter & Gamble Company Light duty liquid or gel dishwashing detergent compositions containing protease
US5435935A (en) 1993-11-22 1995-07-25 The Procter & Gamble Company Alkaline liquid hard-surface cleaning composition containing a quarternary ammonium disinfectant and selected dicarboxylate sequestrants
DE4343993A1 (en) 1993-12-22 1995-06-29 Stockhausen Chem Fab Gmbh Graft copolymers of unsaturated monomers and polyhydroxy compounds, process for their preparation and their use
US5478503A (en) 1994-02-28 1995-12-26 The Procter & Gamble Company Process for making a granular detergent composition containing succinate hydrotrope and having improved solubility in cold temperature laundering solutions
JPH09512849A (en) 1994-05-06 1997-12-22 ザ、プロクター、エンド、ギャンブル、カンパニー Liquid detergent containing polyhydroxy fatty acid amide and toluene sulfonate
PE6995A1 (en) 1994-05-25 1995-03-20 Procter & Gamble COMPOSITION INCLUDING A PROPOXYLATED POLYKYLENE OAMINE POLYKYLENE OAMINE POLYMER AS DIRT SEPARATION AGENT
GB9411080D0 (en) 1994-06-02 1994-07-20 Unilever Plc Treatment
US5670475A (en) 1994-08-12 1997-09-23 The Procter & Gamble Company Composition for reducing malodor impression of inanimate surfaces
US5580154A (en) 1994-08-24 1996-12-03 Coulter; James D. Glow-in-the-dark glove apparatus
DE19503116A1 (en) 1995-02-01 1996-08-08 Basf Ag Use of water-soluble grafted natural substances as an additive for dishwashing detergents
US5547612A (en) 1995-02-17 1996-08-20 National Starch And Chemical Investment Holding Corporation Compositions of water soluble polymers containing allyloxybenzenesulfonic acid monomer and methallyl sulfonic acid monomer and methods for use in aqueous systems
DE19509806A1 (en) 1995-03-21 1996-09-26 Basf Ag Storage stable dosage forms
EP0735065B1 (en) 1995-03-24 1997-05-28 Giulini Chemie GmbH Amphoteric polymer dispersion, process for preparation and its use
US5654198A (en) 1995-06-05 1997-08-05 National Starch And Chemical Investment Holding Corporation Detectable water-treatment polymers and methods for monitoring the concentration thereof
DE69731078T2 (en) 1996-03-19 2005-10-06 The Procter & Gamble Company, Cincinnati MANUFACTURING METHOD OF MACHINE DISHWASHER CONTAINING FLOWERY PERFUME AND BUILDER
EG22088A (en) 1996-04-16 2002-07-31 Procter & Gamble Alkoxylated sulfates
US6004922A (en) 1996-05-03 1999-12-21 The Procter & Gamble Company Laundry detergent compositions comprising cationic surfactants and modified polyamine soil dispersents
MA25183A1 (en) 1996-05-17 2001-07-02 Arthur Jacques Kami Christiaan DETERGENT COMPOSITIONS
US6150322A (en) 1998-08-12 2000-11-21 Shell Oil Company Highly branched primary alcohol compositions and biodegradable detergents made therefrom
US6093856A (en) 1996-11-26 2000-07-25 The Procter & Gamble Company Polyoxyalkylene surfactants
US5990065A (en) 1996-12-20 1999-11-23 The Procter & Gamble Company Dishwashing detergent compositions containing organic diamines for improved grease cleaning, sudsing, low temperature stability and dissolution
US6130194A (en) 1997-03-11 2000-10-10 The Procter & Gamble Company Crystalline calcium carbonate builder enrobed with a hydrotrope for use in detergent compositions
BR9811815A (en) 1997-08-02 2000-08-15 Procter & Gamble Poly (oxyalkylated) alcohol surfactants capped with ether
US5872199A (en) 1997-08-29 1999-02-16 Lions Adhesives, Inc. Sugar based vinyl monomers and copolymers useful in repulpable adhesives and other applications
US5977275A (en) 1998-02-17 1999-11-02 National Starch And Chemical Investment Holding Corporation Polymers having pendant polysaccharide moieties and uses thereof
GB9807426D0 (en) 1998-04-08 1998-06-03 Ici Plc Environmentally friendly aqueous architectural coating compositions
US6103839A (en) 1998-05-11 2000-08-15 Nalco Chemical Company Horizontally flowing continuous free radical polymerization process for manufacturing water-soluble polymers from monomers in aqueous solution
WO1999061569A1 (en) 1998-05-22 1999-12-02 The Procter & Gamble Company Acidic cleaning compositions with c10 alkyl sulfate detergent surfactant
PL344646A1 (en) 1998-06-02 2001-11-19 Procter & Gamble Dishwashing detergent compositions containing organic diamines
DE19903979C2 (en) 1999-01-25 2000-12-21 Worlee Chemie G M B H Starch-based graft polymer, process for its production and its use in printing inks over overprint varnishes
AU5163400A (en) 1999-05-26 2000-12-12 Procter & Gamble Company, The Liquid detergent compositions comprising polymeric suds enhancers
US6908955B2 (en) 1999-07-09 2005-06-21 Construction Research & Technology Gmbh Oligomeric dispersant
DE19935063A1 (en) 1999-07-28 2001-02-01 Basf Ag Graft polymers as gas hydrate inhibitors
WO2001032815A1 (en) 1999-10-29 2001-05-10 The Procter & Gamble Company Laundry detergent compositions with fabric care
US7534589B2 (en) 1999-11-10 2009-05-19 The Board Of Regents Of The University Of Oklahoma Polymer grafting by polysaccharide synthases
EP1235820B1 (en) 1999-12-08 2006-08-23 The Procter & Gamble Company Ether-capped poly(oxyalkylated) alcohol surfactants
JP4430843B2 (en) 2001-01-05 2010-03-10 ザ プロクター アンド ギャンブル カンパニー Liquid detergent composition comprising a quaternary nitrogen-containing and / or zwitterionic polymeric soap foam enhancer
JP2003003197A (en) 2001-01-05 2003-01-08 Procter & Gamble Co:The Composition and method using amine oxide monomer unit- containing polymeric suds enhancer
EP1236748A1 (en) 2001-02-22 2002-09-04 Ecole Polytechnique Federale De Lausanne Polymer flocculents and preparation thereof
US6835708B2 (en) 2001-03-07 2004-12-28 Nippon Shokubai Co., Ltd. Graft polymer composition and its production process and uses
GB0117768D0 (en) 2001-07-20 2001-09-12 Unilever Plc Use of polymers in fabrics cleaning
US20030092584A1 (en) 2001-11-13 2003-05-15 Crews James B. Deep water completions fracturing fluid compositions
DE10156133A1 (en) 2001-11-16 2003-05-28 Basf Ag Graft polymers with side chains containing nitrogen heterocycles
DE10156135A1 (en) 2001-11-16 2003-06-05 Basf Ag Graft polymers with side chains containing nitrogen heterocycles
EP1347000A1 (en) 2002-03-20 2003-09-24 Tecnotessile Società Nazionale Di Ricerca Tecnologica r.l. Free-radical functionalized polysaccharides
DE10218418A1 (en) * 2002-04-24 2003-11-06 Basf Ag Aqueous polymer dispersions based on copolymers of vinyl aromatics and butadiene, processes for their preparation and their use as sizes for paper
US8158695B2 (en) 2002-09-06 2012-04-17 Johnson & Johnson Vision Care, Inc. Forming clear, wettable silicone hydrogel articles without surface treatments
US6800712B2 (en) 2002-10-07 2004-10-05 Steven William Doane Starch graft copolymers and method of making and using starch graft copolymers for agriculture
FR2846978B1 (en) 2002-11-08 2007-05-18 Coatex Sas USE OF A COPOLYMER HAVING AT LEAST ONE GRAFT FUNCTION ALKOXY OR HYDROXY POLYALKYLENE GLYCOL, AS AGENT ENHANCING ACTIVATION OF OPTICAL AZURING AND PRODUCTS OBTAINED
US20050215449A1 (en) 2002-11-20 2005-09-29 Josef Penninger Textile care product
US7166671B2 (en) 2002-12-10 2007-01-23 Cellresin Technologies, Llc Grafted cyclodextrin
DE10308753A1 (en) 2003-02-28 2004-09-09 Bayer Ag Cationic starch graft copolymers and new process for the production of cationic starch graft copolymers
MXPA06000487A (en) 2003-07-25 2006-04-05 Basf Ag Aqueous dispersions of hydrosoluble polymerisates of ethylenically unsaturated anionic monomers, method for the production and use thereof.
JP2005120045A (en) 2003-10-17 2005-05-12 Dai Ichi Kogyo Seiyaku Co Ltd Cosmetic composition for hair
US20070138105A1 (en) 2003-12-03 2007-06-21 Ken Takeda Process for producing water-soluble polymer
TR201905649T4 (en) 2003-12-15 2019-05-21 Vjs Investments Ltd A super absorbent polymer product containing a bioactive, growth-promoting additive.
JP4894264B2 (en) 2004-01-20 2012-03-14 東亞合成株式会社 Composition comprising amphoteric water-soluble polymer
CN101432309B (en) 2004-08-27 2012-10-10 吸收剂技术公司 Superabsorbent polymers in agricultural applications
US7691982B2 (en) 2004-09-24 2010-04-06 Nippon Shokubai Co., Ltd. Dispersant using kraft lignin and novel lignin derivative
US7629405B2 (en) 2004-11-19 2009-12-08 Board Of Trustees Of Michigan State University Starch-polyester biodegradable graft copolyers and a method of preparation thereof
US7553919B2 (en) 2005-05-06 2009-06-30 Board Of Trustees Of Michigan State University Starch-vegetable oil graft copolymers and their biofiber composites, and a process for their manufacture
DE102005030789A1 (en) 2005-06-29 2007-01-11 Basf Ag Finely divided, starch-containing polymer dispersions
US9321873B2 (en) 2005-07-21 2016-04-26 Akzo Nobel N.V. Hybrid copolymer compositions for personal care applications
US7435293B2 (en) 2005-12-01 2008-10-14 Halliburton Energy Services, Inc. Cement compositions comprising maltodextrin
NO20073821L (en) 2006-07-21 2008-01-22 Akzo Nobel Chemicals Int Bv Inoculated low molecular weight copolymers
NO20073834L (en) 2006-07-21 2008-01-22 Akzo Nobel Chemicals Int Bv Sulfonated graft copolymers
FR2908135B1 (en) 2006-11-03 2009-02-27 Limousine D Applic Biolog Dite PROCESS FOR OBTAINING SACCHARIDIC POLYMER, SACCHARIDE POLYMERS AND COSMETIC COMPOSITIONS
WO2008089262A1 (en) 2007-01-21 2008-07-24 M-I Llc Method and pill for remediating hydrate condensate blockage in pipelines
EP1950232A1 (en) 2007-01-26 2008-07-30 Polymers Australia PTY Limited Process for the preparation of graft copolymers by Reversible Addition Fragmentation Chain Transfer (RAFT) and Ring Opening Polymerisation (ROP)
US7999040B2 (en) 2007-09-25 2011-08-16 Nanochem Solutions, Inc. Method of making graft copolymers from sodium poly(aspartate) and the resulting graft copolymer
EP2072531A1 (en) 2007-12-21 2009-06-24 Sika Technology AG Polymers with saccharide side chains und their use as a dispersing agent
FR2927083B1 (en) 2008-02-01 2011-04-01 Roquette Freres PROCESS FOR PREPARING THERMOPLASTIC COMPOSITIONS BASED ON SOLUBLE AMYLACEOUS MATERIAL.
ES2360016T5 (en) 2008-06-24 2015-05-05 Cognis Ip Management Gmbh Detergents containing graft copolymers
WO2010144575A1 (en) 2009-06-09 2010-12-16 William Chambers Biodegradable absorbent material and method of manufacture
MX2012000638A (en) 2009-07-14 2012-04-30 Sherwin Williams Co Starch hybrid polymers.
AU2010303254B2 (en) 2009-10-09 2015-10-01 Owens Corning Intellectual Capital, Llc Bio-based binders for insulation and non-woven mats
JP2011195809A (en) 2010-02-26 2011-10-06 Saiden Chemical Industry Co Ltd Method for producing polymer composition
CN101830015B (en) 2010-03-24 2011-08-03 程怡 Method for processing polysaccharide material with polymer composition
WO2011135313A1 (en) 2010-04-30 2011-11-03 Haliburton Energy Services, Inc. Water-soluble degradable synthetic vinyl polymers and related methods
CN101863540A (en) 2010-06-11 2010-10-20 河北理工大学 High-selectivity flocculating agent for separating hematite and preparation method thereof
CN103038303A (en) 2010-06-16 2013-04-10 卡吉尔公司 Starch-based compositions for latex replacement
CN102146150B (en) 2011-01-28 2012-07-04 上海三瑞高分子材料有限公司 Starch derivative copolymer and preparation method and application thereof

Patent Citations (100)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2536658A (en) * 1947-03-25 1951-01-02 Hercules Powder Co Ltd Process for preparing nitrocellulose compatible resins from pentaerythritol, an alpha-beta unsaturated dicarboxylic acid and a rosin acid
US3308067A (en) * 1963-04-01 1967-03-07 Procter & Gamble Polyelectrolyte builders and detergent compositions
US3314891A (en) * 1964-05-27 1967-04-18 Wyandotte Chemicals Corp Low foaming detergent
US3442242A (en) * 1967-06-05 1969-05-06 Algonquin Shipping & Trading Stopping and manoeuvering means for large vessels
US3639312A (en) * 1969-02-25 1972-02-01 Dow Chemical Co Olefin polymers containing sugars
US3723322A (en) * 1969-02-25 1973-03-27 Procter & Gamble Detergent compositions containing carboxylated polysaccharide builders
US3803285A (en) * 1971-01-20 1974-04-09 Cpc International Inc Extrusion of detergent compositions
US3933672A (en) * 1972-08-01 1976-01-20 The Procter & Gamble Company Controlled sudsing detergent compositions
US4133779A (en) * 1975-01-06 1979-01-09 The Procter & Gamble Company Detergent composition containing semi-polar nonionic detergent and alkaline earth metal anionic detergent
US4141841A (en) * 1977-07-18 1979-02-27 The Procter & Gamble Company Antistatic, fabric-softening detergent additive
US4260529A (en) * 1978-06-26 1981-04-07 The Procter & Gamble Company Detergent composition consisting essentially of biodegradable nonionic surfactant and cationic surfactant containing ester or amide
US4265779A (en) * 1978-09-09 1981-05-05 The Procter & Gamble Company Suds suppressing compositions and detergents containing them
US4322472A (en) * 1979-12-14 1982-03-30 Alco Standard Corporation Adhesive based on a starch and acrylamide graft copolymer
US4379080A (en) * 1981-04-22 1983-04-05 The Procter & Gamble Company Granular detergent compositions containing film-forming polymers
US4374035A (en) * 1981-07-13 1983-02-15 The Procter & Gamble Company Accelerated release laundry bleach product
US4565647B1 (en) * 1982-04-26 1994-04-05 Procter & Gamble Foaming surfactant compositions
US4565647A (en) * 1982-04-26 1986-01-21 The Procter & Gamble Company Foaming surfactant compositions
JPS6131497A (en) * 1984-07-20 1986-02-13 三洋化成工業株式会社 Detergent composition
US4634551A (en) * 1985-06-03 1987-01-06 Procter & Gamble Company Bleaching compounds and compositions comprising fatty peroxyacids salts thereof and precursors therefor having amide moieties in the fatty chain
US4652392A (en) * 1985-07-30 1987-03-24 The Procter & Gamble Company Controlled sudsing detergent compositions
US4830773A (en) * 1987-07-10 1989-05-16 Ecolab Inc. Encapsulated bleaches
US5296470A (en) * 1990-07-02 1994-03-22 Rhone-Poulenc Chimie Graft polysaccharides and their use as sequestering agents
US5518657A (en) * 1991-11-07 1996-05-21 Ciba-Geigy Corporation Storage-stable formulation of fluorescent whitening mixtures
US5412026A (en) * 1992-01-22 1995-05-02 Rohm And Haas Company High temperature aqueous polymerization process
US6060582A (en) * 1992-02-28 2000-05-09 The Board Of Regents, The University Of Texas System Photopolymerizable biodegradable hydrogels as tissue contacting materials and controlled-release carriers
US5385959A (en) * 1992-04-29 1995-01-31 Lever Brothers Company, Division Of Conopco, Inc. Capsule which comprises a component subject to degradation and a composite polymer
US5304620A (en) * 1992-12-21 1994-04-19 Halliburton Company Method of crosslinking cellulose and guar derivatives for treating subterranean formations
US5518646A (en) * 1993-04-01 1996-05-21 Lever Industrial Company, Division Of Indopco, Inc. Solid detergent briquettes
US5756442A (en) * 1993-06-11 1998-05-26 Henkel Kommanditgesellschaft Auf Aktien Pourable liquid, aqueous cleaning concentrates II
US5415807A (en) * 1993-07-08 1995-05-16 The Procter & Gamble Company Sulfonated poly-ethoxy/propoxy end-capped ester oligomers suitable as soil release agents in detergent compositions
US5378830A (en) * 1993-09-01 1995-01-03 Rhone-Poulenc Specialty Chemicals Co. Amphoteric polysaccharide compositions
US6025311A (en) * 1993-12-17 2000-02-15 Aqualon Company Fluid suspension of polysaccharides for personal care and household applications
US5753770A (en) * 1993-12-23 1998-05-19 Basf Aktiengesellschaft Preparation of hydrogen peroxide, C1 to C4-monopercarboxylic acid and C4- to C18-dipercarboxylic acid complexes in a fluidized-bed process
US5501815A (en) * 1994-09-26 1996-03-26 Ecolab Inc. Plasticware-compatible rinse aid
US5500154A (en) * 1994-10-20 1996-03-19 The Procter & Gamble Company Detergent compositions containing enduring perfume
US5869070A (en) * 1994-12-06 1999-02-09 The Procter & Gamble Company Shelf stable skin cleansing liquid with gel forming polymer and lipid
US6022844A (en) * 1996-03-05 2000-02-08 The Procter & Gamble Company Cationic detergent compounds
US6194362B1 (en) * 1996-03-19 2001-02-27 The Procter & Gamble Company Glass cleaning compositions containing blooming perfume
US6020303A (en) * 1996-04-16 2000-02-01 The Procter & Gamble Company Mid-chain branched surfactants
US6060443A (en) * 1996-04-16 2000-05-09 The Procter & Gamble Company Mid-chain branched alkyl sulfate surfactants
US6169062B1 (en) * 1996-12-06 2001-01-02 The Procter & Gamble Company Coated detergent tablet
US6365561B1 (en) * 1996-12-20 2002-04-02 Procter & Gamble Company Dishwashing detergent compositions containing organic diamines for improved grease cleaning sudsing, low temperature stability and dissolution
US6221825B1 (en) * 1996-12-31 2001-04-24 The Procter & Gamble Company Thickened, highly aqueous liquid detergent compositions
US6069122A (en) * 1997-06-16 2000-05-30 The Procter & Gamble Company Dishwashing detergent compositions containing organic diamines for improved grease cleaning, sudsing, low temperature stability and dissolution
US6376438B1 (en) * 1997-10-30 2002-04-23 Stockhausen Gmbh & Co. Kg Skin-compatible hand cleanser, especially a course hand cleanser
US6372708B1 (en) * 1997-11-21 2002-04-16 The Procter & Gamble Company Liquid detergent compositions comprising polymeric suds enhancers
US6528477B2 (en) * 1997-11-21 2003-03-04 Procter & Gamble Company Liquid detergent compositions comprising polymeric suds enhancers
US6225462B1 (en) * 1998-01-16 2001-05-01 Lever Brothers Company, A Division Of Conopco, Inc. Conjugated polysaccharide fabric detergent and conditioning products
US6537957B1 (en) * 1998-05-15 2003-03-25 The Procter & Gamble Company Liquid acidic hard surface cleaning composition
US6060299A (en) * 1998-06-10 2000-05-09 Novo Nordisk A/S Enzyme exhibiting mannase activity, cleaning compositions, and methods of use
US6231650B1 (en) * 1999-09-17 2001-05-15 Alistagen Corporation Biocidal coating composition
US20020034487A1 (en) * 2000-01-13 2002-03-21 Mireille Maubru Detergent cosmetic compositions comprising a specific amphoteric starch, and uses thereof
US20020016282A1 (en) * 2000-05-09 2002-02-07 Unilever Home & Personal Care Usa Soil release polymers and laundry detergent compositions containing them
US20020055446A1 (en) * 2000-09-20 2002-05-09 Beatrice Perron Washing composition comprising particles of aluminium oxide, at least one anionic surfactant and at least one amphoteric or nonionic surfactant
US20040033929A1 (en) * 2000-10-13 2004-02-19 Werner Bertleff Use of water-soluble or water-dispersible polyether blocks cotaining graft polymers as coating for washing, cleaning and for the treatment of laundry
US20040039137A1 (en) * 2000-11-21 2004-02-26 Klaus Heinemann Method for producing meltable polyesters
US20040067864A1 (en) * 2000-12-28 2004-04-08 Eric Aubay Use of amphoteric polysaccharide for treating textile fibre articles
US20040067865A1 (en) * 2001-02-15 2004-04-08 Ian Harrison Use of non-ionic polysaccharides in a composition for textile care
US20040048760A1 (en) * 2001-03-23 2004-03-11 Ecolab Inc. Methods and compositions for cleaning, rinsing, and antimicrobial treatment of medical equipment
US20030008793A1 (en) * 2001-05-08 2003-01-09 Osamu Takiguchi Liquid detergent composition
US20030008804A1 (en) * 2001-06-05 2003-01-09 Qiu Xu Starch graft copolymer, detergent builder composition including the same, and production method thereof
US20050019352A1 (en) * 2001-12-11 2005-01-27 Jean-Michel Mercier Method for preparing a water/oil/water multiple emulsion
US20040033939A1 (en) * 2002-05-24 2004-02-19 Daniel Marquess Cross-linked glycopeptide-cephalosporin antibiotics
US7157413B2 (en) * 2002-07-08 2007-01-02 L'oreal Detergent cosmetic compositions comprising an anionic surfactant, an amphoteric, cationic, and/or nonionic surfactant, and a polysacchardie, and use thereof
US20050028293A1 (en) * 2002-09-09 2005-02-10 Cedric Geffroy Rinsing formulation for textiles
US20040071742A1 (en) * 2002-10-10 2004-04-15 Popplewell Lewis Michael Encapsulated fragrance chemicals
US7012048B2 (en) * 2003-02-11 2006-03-14 National Starch And Chemical Investment Holding Corporation Composition and method for treating hair containing a cationic ampholytic polymer and an anionic benefit agent
US20070056900A1 (en) * 2003-09-19 2007-03-15 Basf Aktiengesellschaft Use of copolymers containing n-vinyl lactam for producing functionalized membranes
US20060024353A1 (en) * 2004-01-08 2006-02-02 Gerard Trouve Novel porous film-forming granules, process for their preparation and application in the film coating of tablets and sweets
US20070054816A1 (en) * 2004-05-05 2007-03-08 Damien Berthier Biodegradable grafted copolymers
US20060019858A1 (en) * 2004-07-20 2006-01-26 Unilever Home & Personal Care Usa, Division Of Conopco, Inc. Mild, moisturizing sulfosuccinate cleansing compositions
US20060019847A1 (en) * 2004-07-20 2006-01-26 Unilever Home & Personal Care Usa, Division Of Conopco, Inc. Mild, moisturizing cleansing compositions with improved storage stability
US20060029561A1 (en) * 2004-08-03 2006-02-09 Euen Gunn Polysaccharide graft copolymers and their use in personal care applications
US20070015678A1 (en) * 2005-07-15 2007-01-18 Rodrigues Klin A Modified Polysaccharides
US20070021577A1 (en) * 2005-07-21 2007-01-25 National Starch And Chemical Investment Holding Corporation Hybrid copolymers
US20100069280A1 (en) * 2005-07-21 2010-03-18 Akzo Nobel N.V. Hybrid copolymers
US7670388B2 (en) * 2005-10-14 2010-03-02 Kao Corporation Fiber-treating composition
US20100008870A1 (en) * 2006-02-28 2010-01-14 Appleton Papers Inc. Benefit agent containing delivery particle
US20100086575A1 (en) * 2006-02-28 2010-04-08 Jiten Odhavji Dihora Benefit agent containing delivery particle
US20080021168A1 (en) * 2006-07-21 2008-01-24 National Starch And Chemical Investment Holding Corporation Low molecular weight graft copolymers
US20080021167A1 (en) * 2006-07-21 2008-01-24 National Starch And Chemical Investment Holding Co Sulfonated graft copolymers
US7902276B2 (en) * 2006-08-31 2011-03-08 Harima Chemicals, Inc. Surface sizing agent and use thereof
US20090011973A1 (en) * 2007-07-02 2009-01-08 Ecolab Inc. Solidification matrix including a salt of a straight chain saturated mono-, di-, and tri- carboxylic acid
US20090011214A1 (en) * 2007-07-02 2009-01-08 Yin Wang Polymeric Composition for Cellulosic Material Binding and Modifications
US20090023625A1 (en) * 2007-07-19 2009-01-22 Ming Tang Detergent composition containing suds boosting co-surfactant and suds stabilizing surface active polymer
US20090062175A1 (en) * 2007-08-31 2009-03-05 Laura Cermenati Liquid acidic hard surface cleaning composition
US20090087390A1 (en) * 2007-09-27 2009-04-02 Modi Jashawant J Fluidized slurry of water soluble and or water-swellable polymer and mixture thereof (FPS) for use in dentifrice and household applications
US20110034622A1 (en) * 2008-04-01 2011-02-10 Kansai Paint Co., Ltd. Aqueous dispersion and aqueous coating composition, and process of forming coating film
US20100056413A1 (en) * 2008-09-04 2010-03-04 Harry Jr David Ray high-temperature cleaning system, associated substrates, and associated methods
US20100075879A1 (en) * 2008-09-19 2010-03-25 The Procter & Gamble Company Detergent Composition Containing Suds Boosting and Suds Stabilizing Modified Biopolymer
US20100075880A1 (en) * 2008-09-19 2010-03-25 The Procter & Gamble Company Dual Character Biopolymer Useful in Cleaning Products
US20100075887A1 (en) * 2008-09-19 2010-03-25 The Procter & Gamble Company Attention: Chief Patent Counsel Dual Character Polymer Useful in Fabric Care Products
US20100093584A1 (en) * 2008-10-09 2010-04-15 Hercules Incorporated Cleansing Formulations Comprising Non-Cellulosic Polysaccharide With Mixed Cationic Substituents
US20110017945A1 (en) * 2009-07-27 2011-01-27 Ecolab Inc. Novel formulation of a ware washing solid controlling hardness
US20110021410A1 (en) * 2009-07-27 2011-01-27 Ecolab Usa Inc. Novel formulation of a ware washing solid controlling hardness
US20110028371A1 (en) * 2009-07-31 2011-02-03 Akzo Nobel N.V. Hybrid copolymers
US20130035274A1 (en) * 2011-08-05 2013-02-07 Ecolab Usa Inc. Cleaning composition containing a polysaccharide hybrid polymer composition and methods of controlling hard water scale
US20130035277A1 (en) * 2011-08-05 2013-02-07 Ecolab Usa Inc. Cleaning composition containing a polysaccharide hybrid polymer composition and methods of improving drainage
US20130035273A1 (en) * 2011-08-05 2013-02-07 Ecolab Usa Inc. Composition containing a polysaccharide hybrid polymer and methods of controlling hard water scale
US20130035276A1 (en) * 2011-08-05 2013-02-07 Ecolab Usa Inc. Cleaning composition containing a polysaccharide graft polymer composition and methods of controlling hard water scale

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Translation of JP 61031497 A, 2014 *

Cited By (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110136718A1 (en) * 2005-07-21 2011-06-09 Akzo Nobel N.V. Hybrid copolymers
US9321873B2 (en) 2005-07-21 2016-04-26 Akzo Nobel N.V. Hybrid copolymer compositions for personal care applications
US9109068B2 (en) 2005-07-21 2015-08-18 Akzo Nobel N.V. Hybrid copolymer compositions
US8058374B2 (en) 2005-07-21 2011-11-15 Akzo Nobel N.V. Hybrid copolymers
US20100069280A1 (en) * 2005-07-21 2010-03-18 Akzo Nobel N.V. Hybrid copolymers
US20110046025A1 (en) * 2006-07-21 2011-02-24 Akzo Nobel N.V. Low Molecular Weight Graft Copolymers
US20080020948A1 (en) * 2006-07-21 2008-01-24 Rodrigues Klin A Sulfonated Graft Copolymers
US8674021B2 (en) 2006-07-21 2014-03-18 Akzo Nobel N.V. Sulfonated graft copolymers
US8227381B2 (en) 2006-07-21 2012-07-24 Akzo Nobel N.V. Low molecular weight graft copolymers for scale control
US8133357B2 (en) 2008-04-18 2012-03-13 Usg Interiors, Inc. Panels including renewable components and methods for manufacturing same
US8080133B2 (en) 2008-04-18 2011-12-20 Usg Interiors, Inc. Panels including renewable components and methods for manufacturing
US7935223B2 (en) 2008-04-18 2011-05-03 ISG Interiors, Inc. Panels including renewable components and methods for manufacturing
US20090260918A1 (en) * 2008-04-18 2009-10-22 Bangji Cao Panels including renewable components and methods for manufacturing same
US20090260770A1 (en) * 2008-04-18 2009-10-22 Cao Bangii Panels including renewable components and methods for manufacturing
US20110180225A1 (en) * 2008-04-18 2011-07-28 Cao Bangii Panels including renewable components and methods for manufacturing
US20090291859A1 (en) * 2008-05-22 2009-11-26 Michael Valls Drilling fluid additive
US20100081784A1 (en) * 2008-09-26 2010-04-01 Sabic Innovative Plastics Ip Bv Method of making isosorbide polycarbonate
US20110077377A1 (en) * 2008-09-26 2011-03-31 Sabic Innovative Plastics Ip Bv Method of Making Isosorbide Polycarbonate
US7863404B2 (en) 2008-09-26 2011-01-04 Sabic Innovative Plastics Ip B.V. Method of making isosorbide polycarbonate
WO2010076291A1 (en) 2008-12-29 2010-07-08 Akzo Nobel N.V. Coated particles of a chelating agent
US9790418B2 (en) 2009-04-09 2017-10-17 Schlumberger Technology Corporation Silica composition for servicing subterranean wells
US20100258310A1 (en) * 2009-04-09 2010-10-14 Simon James Compositions and methods for servicing subterranean wells
US8936081B2 (en) * 2009-04-09 2015-01-20 Schlumberger Technology Corporation Compositions and methods for servicing subterranean wells
US8869895B2 (en) * 2009-12-08 2014-10-28 Halliburton Energy Services, Inc. Biodegradable set retarder for a cement composition
US20130085207A1 (en) * 2009-12-08 2013-04-04 Halliburton Energy Services, Inc. Biodegradable Set Retarder For A Cement Composition
US20110132605A1 (en) * 2009-12-08 2011-06-09 Halliburton Energy Services, Inc. Biodegradable Set Retarder For A Cement Composition
US8728231B2 (en) * 2009-12-08 2014-05-20 Halliburton Energy Services, Inc. Biodegradable set retarder for a cement composition
WO2011080206A2 (en) 2009-12-28 2011-07-07 Akzo Nobel Chemicals International B.V. Functionalized polyvinyl alcohol films
US9309438B2 (en) 2011-04-05 2016-04-12 ALLNEX Belgium SA Radiation curable compositions
US8853144B2 (en) * 2011-08-05 2014-10-07 Ecolab Usa Inc. Cleaning composition containing a polysaccharide graft polymer composition and methods of improving drainage
US20150005217A1 (en) * 2011-08-05 2015-01-01 Ecolab Usa Inc. Cleaning composition containing a polysaccharide hybrid polymer composition and methods of improving drainage
WO2013022769A1 (en) * 2011-08-05 2013-02-14 Ecolab Usa Inc. Cleaning composition containing a polysaccharide graft polymer composition and methods of controlling hard water scale
US8636918B2 (en) * 2011-08-05 2014-01-28 Ecolab Usa Inc. Cleaning composition containing a polysaccharide hybrid polymer composition and methods of controlling hard water scale
US8841246B2 (en) * 2011-08-05 2014-09-23 Ecolab Usa Inc. Cleaning composition containing a polysaccharide hybrid polymer composition and methods of improving drainage
US20130035276A1 (en) * 2011-08-05 2013-02-07 Ecolab Usa Inc. Cleaning composition containing a polysaccharide graft polymer composition and methods of controlling hard water scale
US20150005218A1 (en) * 2011-08-05 2015-01-01 Ecolab Usa Inc. Cleaning composition containing a polysaccharide graft polymer compositon and methods of improving drainage
US9309489B2 (en) * 2011-08-05 2016-04-12 Ecolab Usa Inc Cleaning composition containing a polysaccharide hybrid polymer composition and methods of improving drainage
US8679366B2 (en) * 2011-08-05 2014-03-25 Ecolab Usa Inc. Cleaning composition containing a polysaccharide graft polymer composition and methods of controlling hard water scale
US9309490B2 (en) * 2011-08-05 2016-04-12 Ecolab Usa Inc. Cleaning composition containing a polysaccharide graft polymer compositon and methods of improving drainage
US9051406B2 (en) * 2011-11-04 2015-06-09 Akzo Nobel Chemicals International B.V. Graft dendrite copolymers, and methods for producing the same
US9988526B2 (en) 2011-11-04 2018-06-05 Akzo Nobel Chemicals International B.V. Hybrid dendrite copolymers, compositions thereof and methods for producing the same
US20140309392A1 (en) * 2011-11-04 2014-10-16 Akzo Nobel Chemicals International B.V. Graft dendrite copolymers, and methods for producing the same
US9950502B2 (en) 2011-12-06 2018-04-24 Basf Se Paper and cardboard packaging with barrier coating
US9109137B2 (en) 2012-03-30 2015-08-18 ALLNEX Belgium SA Radiation curable (meth) acrylated compounds
US9540310B2 (en) 2012-03-30 2017-01-10 Allnex Belgium S.A. Radiation curable (meth)acrylated compounds
US8945314B2 (en) * 2012-07-30 2015-02-03 Ecolab Usa Inc. Biodegradable stability binding agent for a solid detergent
US9303237B2 (en) * 2012-07-30 2016-04-05 Ecolab Usa Inc. Biodegradable stability binding agent for a solid detergent
US8765658B2 (en) * 2012-09-12 2014-07-01 Carus Corporation Method for making and using a stable cleaning composition
US8901057B2 (en) * 2012-10-29 2014-12-02 Ecolab Usa Inc. Use of a starch base copolymer in conjunction with a maleic polymer and a hydroxypolycarboxylic acid to control hardness under alkaline conditions
US9243216B2 (en) 2012-10-29 2016-01-26 Ecolab USA, Inc. Use of a starch base copolymer in conjunction with a maleic polymer and a hydroxypolycarboxylic acid to control hardness under alkaline conditions
US8802617B2 (en) * 2012-11-08 2014-08-12 Ecolab Usa Inc. Polyglycerol graft polymers with low concentrations of carboxylic acid containing monomers and their applications
US9057005B2 (en) * 2013-03-22 2015-06-16 Pitney Bowes Inc. Concentrate for preparing a sealing solution for sealing mail pieces using tap water and method of making same
US20140283708A1 (en) * 2013-03-22 2014-09-25 Pitney Bowes Inc. Concentrate for preparing a sealing solution for sealing mail pieces using tap water and method of making same
US9365805B2 (en) 2014-05-15 2016-06-14 Ecolab Usa Inc. Bio-based pot and pan pre-soak
US10053652B2 (en) 2014-05-15 2018-08-21 Ecolab Usa Inc. Bio-based pot and pan pre-soak
US10160815B2 (en) * 2014-08-14 2018-12-25 Roquette Freres Dextrin copolymer with styrene and an acrylic ester, manufacturing method thereof, and use thereof for paper coating
US20190144730A1 (en) * 2016-12-20 2019-05-16 Saudi Arabian Oil Company Loss Circulation Material for Seepage to Moderate Loss Control
US10844265B2 (en) * 2016-12-20 2020-11-24 Saudi Arabian Oil Company Loss circulation material for seepage to moderate loss control
CN116462802A (en) * 2023-06-19 2023-07-21 河北省科学院能源研究所 Environment-friendly scale inhibition dispersing agent and preparation method thereof

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