CA2519576A1 - Polyvinyl alcohol copolymer film for packaging liquid products and having an improved shelf-life - Google Patents
Polyvinyl alcohol copolymer film for packaging liquid products and having an improved shelf-life Download PDFInfo
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- CA2519576A1 CA2519576A1 CA002519576A CA2519576A CA2519576A1 CA 2519576 A1 CA2519576 A1 CA 2519576A1 CA 002519576 A CA002519576 A CA 002519576A CA 2519576 A CA2519576 A CA 2519576A CA 2519576 A1 CA2519576 A1 CA 2519576A1
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- water
- soluble
- copolymer
- packet
- monomer
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/04—Detergent materials or soaps characterised by their shape or physical properties combined with or containing other objects
- C11D17/041—Compositions releasably affixed on a substrate or incorporated into a dispensing means
- C11D17/042—Water soluble or water disintegrable containers or substrates containing cleaning compositions or additives for cleaning compositions
- C11D17/043—Liquid or thixotropic (gel) compositions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/44—Preparation of metal salts or ammonium salts
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2810/00—Chemical modification of a polymer
- C08F2810/50—Chemical modification of a polymer wherein the polymer is a copolymer and the modification is taking place only on one or more of the monomers present in minority
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
Abstract
Generally speaking, the present invention is a water-soluble copolymer film comprising a hydrolyzed copolymer of vinyl acetate and a second monomer, the resultant polyvinyl alcohol copolymer having a degree of hydrolysis, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, of from about 90% to 100%. The second monomer is preferably selected from the group of monomers having carboxylate functionality or sulfonate functionality.
The resulting water-soluble copolymer film is disclosed for use in making pouches to contain a unit dose of liquid detergent, such as a liquid laundry detergent. However, it is an aspect of the copolymer film that film solubility to is not significantly affected adversely by the detergent. Such film produces pouches having a greater storage shelf-life over prior art water-soluble film.
The resulting water-soluble copolymer film is disclosed for use in making pouches to contain a unit dose of liquid detergent, such as a liquid laundry detergent. However, it is an aspect of the copolymer film that film solubility to is not significantly affected adversely by the detergent. Such film produces pouches having a greater storage shelf-life over prior art water-soluble film.
Description
FOL.~~1I1L AILCOH~I~ COhOIJ I~ FIfL
h'~Iu 1P~CIQ~llI'~T~ ILfL~~llll~ h'~'~ID~TC~7~~
~I' 1'T(D l~L~ ' ~L1~~T~ ~1'J ~~ ' 1~°~ ~I~~~J~~-~JTllr°'F
TEc~HI'~TICA1L FIE1LD ~~" TH1E IIl~TI~1~T
The present invention relates generally to polyvinyl alcohol copolymer film for packaging liquid products, such as, for example, laundry detergent. 1 ore specifically, the present invention relates to polyvinyl alcohol copolymer film wherein the copolymer has structural features which provide an improved film shelf life.
BACKGROUND OF THE INVENTION
Polyvinyl alcohol (PVOH) is a synthetic resin generally prepared by the alcoholysis, usually termed hydrolysis or saponification, of polyvinyl acetate. Fully hydrolyzed PVOH, 1o where virtually all the acetate groups have been converted to alcohol groups, is a strongly hydrogen-bonded, highly crystalline polymer which dissolves only in hot water-greater than about 140 °F (60 ° C). If a sufficient number of acetate groups are allowed to remain after the hydrolysis of polyvinyl acetate, the PVOH polymer then being known as partially hydrolyzed, it is more weakly hydrogen-bonded and less crystalline and is soluble in cold water-less than about 50° F (10° C). Both fully and partially hydrolyzed PVOH types are commonly referred to as PVOH homopolymers although the partially hydrolyzed type is technically a vinyl alcohol-vinyl acetate copolymer.
The term PVOH copolymer is generally used to describe polymers that are derived by the hydrolysis of a copolymer of a vinyl ester, typically vinyl acetate, and another 2o monomer. PVOH copolymers can be tailored to desired film characteristics by varying the kind and quantity of copolymerized monomers. Examples of copolymerizations are those of vinyl acetate with a carboxylic acid or with an ester of a carboxylic acid.
Again, if the hydrolysis of acetate groups in these copolymers is only partial, then the resulting polymer could be described as a PVOH terpolyrr~er-having vinyl acetate, vinyl alcohol9 and carboxylate groups-although it is commonly referred to as a copolymer.
It is known in the art that many PVOH copolymers, because of their structure, can be much more rapidly soluble in cold water than the partially hydrolyzed type of PVOH
homopolymers. Such copolymers have therefore found considerable utility in the fabrication of packaging films for the unit dose presentation of various liquid and powdered products including agrochemicals, household and industrial cleaning chemicals, laundry detergents, water treatment chemicals and the like.
Examples of such copolymers are those prepared by the hydrolysis (base catalyzed alcoholysis) of copolymers of vinyl acetate and carboxylic acid vinyl monomers, and copolymers of vinyl acetate and esters of carboxylic acid vinyl monomers. If sufficient base is present such that the acid groups (including those resulting from ester hydrolysis) are neutralized to form carboxylate salt groups i.e., ionomer groups, the cold water-solubility of these PVOH copolymers, and hence films fabricated from them, is very rapid.
Examples of carboxylate-containing PVOH copolymers derived from monocarboxylic acid vinyl monomers and their esters are those prepared by the hydrolysis of a vinyl acetate-acrylic acid copolymer, a vinyl acetate-crotonic acid copolymer, a vinyl acetate-methyl acrylate copolymer, a vinyl acetate-methacrylic acid copolymer, and a vinyl acetate-methyl methacrylate copolymer, all of which have excellent cold water-solubility. In fact, packaging films based on PVOH copolymers having carboxylate groups are generally considered in the art to be the most rapidly cold water-soluble films.
One of the largest markets for these films is the liquid laundry detergent market where the convenience of the unit dose concept is widely accepted and the rapid solubility of the films is particularly suited to this application.
2o However, a significant problem exists with the chemical compatibility of virtually all liquid laundry detergent formulations and most of the commercial film used to package these products. The commercial film is based on a carboxylate-containing PVOH
copolymer where the carboxylate units, if converted to carboxylic acid groups, are readily able to form stable lactones by cyclizing with adjacent hydroxyl groups. Specifically, the chemical incompatibility derives from the acid-base equilibria that exist in the liquid laundry detergent formulations and are usually in the form of amine-fatty acid equilibria andlor amine-anionic surfactant acid equilibria. Even if the detergent formulation is at an alkaline pH by virtue of the presence of a molar excess of amine, exchangeable hydrogen ions are still available to react with the carboxylate groups of the PVOH copolymer.
S~Jhen this happens, carboxylic acid groups form and they in turn will readily react with adjacent hydroxyl groups to form intramolecular lactones if the lactones have stable five-membered (gamma, y) ring structures. Other liquid products too numerous to mention may present similar chemical incompatibilities and are, therefore, addressed by the present invention.
The solubility of the polymer and hence the film is markedly affected by this reaction to form lactones; complete insolubility can occur in some cases resulting in polymer residues being attached to items of clothing at the end of a wash cycle. All the above-mentioned carboxylate-containing copolymers derived from monocarboxylic acid vinyl monomers and their esters are subject to this reversion to stable ~- lactones in the presence of hydrogen ions. There is therefore a need to provide cold water-soluble films, preferably including those based on PV~frI copolymers having carboxylate functionality (because of their fast solubility) where the functional groups of the copolymers which facilitate cold water solubility are substantially unaffected by hydrogen ions or, if chemically modified by 1o reaction with hydrogen ions, the modified functional groups do not significantly affect the water solubility of the films.
SUMMARY OF THE INVENTION
A water-soluble copolymer film is disclosed for use in making pouches to contain a liquid material, such as a liquid laundry detergent, wherein the film solubility is not significantly affected adversely by the detergent. Such film produces pouches having a greater storage shelf-life over prior art water-soluble film.
In one embodiment, the present water-soluble film comprises vinyl acetate copolymerized with itaconic acid as a second monomer to produce, after hydrolysis, a 2o polyvinyl alcohol copolymer with a degree of hydrolysis, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, from about 9~%~ to about 100%.
In several other embodiments, the second monomer may be selected from the group of monomers consisting of monocarboxylic acid vinyl monomers, their esters and anhydrides, dicarboxylic monomers having a polymerizable double bond, their esters and anhydrides, and vinyl sulfonic acid monomers and their alkali metal salts. The degree of hydrolysis for these copolymer embodiments varies.
In such embodiments where the second monomer is one of either monocarboxylic acid vinyl monomers, their esters and anhydrides, dicarboxylic monomers having a polymerizable double bond, or their esters and anhydrides, it is an aspect of the invention 3o that the monomer be specifically selected from the group consisting of vinyl acetic acid, malefic acid, monomethyl maleate, dimethyl maleate, malefic anhydride, itaconic acid, monomethyl itaconate, dimethyl itaconate, and itaconic anhydride. Most preferably, the second monomer is itaconic acid.
In other such embodiments it is an aspect of the invention that the second monomer is a vinyl sulfonic acid monomer or its alkali metal salts. Specifically, the second monomer is selected from the group of sulfonic acid monomers and their alkali metal salts consisting of vinyl sulfonic acid, allyl sulfonic acid, ethylene sulf~nic acid, ~-acrylaxnido-1-methylpropanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, 2-methylacrylanudo-2-methylpropanesulfonic acid, and 2-sulfoethyl acrylate.
ll~ost preferably, the second monomer for these embodiments is 2-acrylamido-2-methylpropanesulfonic acid.
Generally speaking, the present invention is a water-soluble copolymer film comprising vinyl acetate copolymerized with a second monomer to produce a polyvinyl alcohol copolymer having certain structural features which serve to improve the shelf life of the film, and wherein the second monomer is selected from the group consisting of monomers having carboxylate functionality or sulfonate functionality.
It is another aspect of the disclosed invention to produce a liquid product packet comprising a water-soluble film comprised of a polyvinyl alcohol copolymer wherein a comonomer of the film copolymer is selected from the group consisting of monocarboxylic acid vinyl monomers, their esters and anhydrides, dicarboxylic monomers having a polymerizable double bond, their esters and anhydrides or vinyl sulfonic acid monomers and their alkali metal salts. The present embodiment includes a quantity of a liquid product enclosed within the water-soluble film packet.
These and other objects of the invention are disclosed and claimed in the following detailed description of the invention, including the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention described herein can be more readily understood with reference to the appended drawing figures where:
FIGURE 1 is a perspective view of a test apparatus used to determine the water disintegration and dissolution times of film samples;
FIGURE 2 is a perspective view of the test apparatus and test set-up illustrating the 3o procedure for determining the water-solubility of film samples; and FIGURE 3 is a top view of the test set-up of FIGURE Z.
DETAILED DESCRIPTION OF THE INVENTION
While the invention is susceptible of embodiment in many different forms, this disclosure will describe in detail preferred embodiments of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspect of the invention to the embodiments illustrated.
In the present invention, specific monomers within three general chemical classes are selected for copolymerization with vinyl acetate such that the base-catalyzed alcoholysis products of these copolymers, which are used in the formulation of the water-soluble film, 1o retain excellent solubility performance in the presence of hydrogen ions.
The copolymers used in the formulation of the water-soluble films have one of either 1) carboxylate functionality or 2) sulfonate functionality.
1. Copolymers with Carboxylate FunctionalitX
Specific monocarboxylic acid vinyl monomers (for example, structure (a) shown 15 below) and their esters and anhydrides, and specific dicarboxylic monomers (for example, structure (b) shown below) having a polymerizable double bond and their esters and anhydrides are selected for copolymerization with vinyl acetate.
O
OH
a. Vinyl acetic acid b. Itaconic acid (Carboxylic acid vinyl monomer) (Dicarboxylic acid monomer) The base-catalyzed alcoholysis products of these copolymers, which are used in the formulation of the water-soluble film, retain carboxylate functionality in the presence of hydrogen ions because of the low steric stability, and therefore non-formation, of six-3o membered (delta, ~) lactone rings. Examples of the selected monomers are vinyl acetic acid, malefic acid, monomethyl maleate, dimethyl maleate, malefic anhydride, itaconic acid, monomethyl itaconate, dimethyl itaconate and itaconic anhydride.
By way of illustration and comparison, structures (c) and (d) are provided to show the statically favored y-lectors and the non-favored ~-lectors, respectively, as they would, . ~, form on the polyvinyl alcohol polymer bacl~bone:
s c. y-Lactone d. S-Lactone A carboxylate-containing PVOH copolymer based on the copolymerization of, for example, acrylic acid with vinyl acetate would have its carboxylate unit directly attached to the polymer backbone and th~eefore, when in the acid form, able to form a stable five-membered y- lectors (structure (c) above) by cyclizing with an adjacent hydroxyl group. In contrast, a copolymer derived from vinyl acetic acid would have a methylene group between the polymer backbone and the carboxylate unit; in this,case, only a six-membered S- lectors (structure (d) above) could form and this is not a statically favorable entity. In the case of others such as itaconic acid, a.dicarboxylic acid, one of the carboxylate groups can ultimately form a y- lectors but the other can only form a 8- lectors; the latter therefore remains intact and film solubility is preserved.
In the present invention, the preferred monomer for copolymerization with vinyl acetate from the group of monomers providing carboxylate functionality is itaconic acid.
The preferred water-soluble film is therefore based on a vinyl alcohol-co-itaconic acid (sodium salt) copolymer.
Copolymer Synthesis The vinyl acetate-co-itaconic acid copolymer is prepared under nitrogen, and in methanol as solvent, using 2,2'-azobis(isobutyronitrile) (AIBl~T) as initiator. Alcoholysis of this copolymer is carried out in methanolic sodium hydroxide and the recovered dlinyl alcohol-co-itaconic acid (sodie~m salt) copolyaner is ground, washed to remove residual sodium acetate, and dried. These reactions are known in the art and have been reported, for example, by Moritani et. al (Polymer Preprints, Japan; 31, 126 (1982)) The preferred degree of polymerization of the vinyl alcohol-co-itaconic acid (sodium salt) copolymer is such that the viscosity of a 4%~ aqueous solution at 20°C is within a range of from about 5 to about 45 I~a.s (cps), including all ranges and combination of ranges which are a subset thereof. fore preferred is a range of 11- 30 l~a.s and especially preferred is a range of 15 - 25 I~a.s.
The preferred level of incorporation of itaconic acid comonomer in the vinyl alcohol-co-itaconic acid (sodium salt) copolymer, expressed as a mole percentage, is within the range of from about 1.5 to about 11 mole%, including all ranges and combination of ranges which are a subset thereof. ll~ore preferred is a range of 2.5 - ~.5 mole%~
and especially preferred is a range of 4 - 6 mole%.
The preferred degree of hydrolysis of the vinyl alcohol-co-itaconic acid (sodium salt) copolymer of the present invention, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, is within the range of from about 9~ to 100%.
h'~Iu 1P~CIQ~llI'~T~ ILfL~~llll~ h'~'~ID~TC~7~~
~I' 1'T(D l~L~ ' ~L1~~T~ ~1'J ~~ ' 1~°~ ~I~~~J~~-~JTllr°'F
TEc~HI'~TICA1L FIE1LD ~~" TH1E IIl~TI~1~T
The present invention relates generally to polyvinyl alcohol copolymer film for packaging liquid products, such as, for example, laundry detergent. 1 ore specifically, the present invention relates to polyvinyl alcohol copolymer film wherein the copolymer has structural features which provide an improved film shelf life.
BACKGROUND OF THE INVENTION
Polyvinyl alcohol (PVOH) is a synthetic resin generally prepared by the alcoholysis, usually termed hydrolysis or saponification, of polyvinyl acetate. Fully hydrolyzed PVOH, 1o where virtually all the acetate groups have been converted to alcohol groups, is a strongly hydrogen-bonded, highly crystalline polymer which dissolves only in hot water-greater than about 140 °F (60 ° C). If a sufficient number of acetate groups are allowed to remain after the hydrolysis of polyvinyl acetate, the PVOH polymer then being known as partially hydrolyzed, it is more weakly hydrogen-bonded and less crystalline and is soluble in cold water-less than about 50° F (10° C). Both fully and partially hydrolyzed PVOH types are commonly referred to as PVOH homopolymers although the partially hydrolyzed type is technically a vinyl alcohol-vinyl acetate copolymer.
The term PVOH copolymer is generally used to describe polymers that are derived by the hydrolysis of a copolymer of a vinyl ester, typically vinyl acetate, and another 2o monomer. PVOH copolymers can be tailored to desired film characteristics by varying the kind and quantity of copolymerized monomers. Examples of copolymerizations are those of vinyl acetate with a carboxylic acid or with an ester of a carboxylic acid.
Again, if the hydrolysis of acetate groups in these copolymers is only partial, then the resulting polymer could be described as a PVOH terpolyrr~er-having vinyl acetate, vinyl alcohol9 and carboxylate groups-although it is commonly referred to as a copolymer.
It is known in the art that many PVOH copolymers, because of their structure, can be much more rapidly soluble in cold water than the partially hydrolyzed type of PVOH
homopolymers. Such copolymers have therefore found considerable utility in the fabrication of packaging films for the unit dose presentation of various liquid and powdered products including agrochemicals, household and industrial cleaning chemicals, laundry detergents, water treatment chemicals and the like.
Examples of such copolymers are those prepared by the hydrolysis (base catalyzed alcoholysis) of copolymers of vinyl acetate and carboxylic acid vinyl monomers, and copolymers of vinyl acetate and esters of carboxylic acid vinyl monomers. If sufficient base is present such that the acid groups (including those resulting from ester hydrolysis) are neutralized to form carboxylate salt groups i.e., ionomer groups, the cold water-solubility of these PVOH copolymers, and hence films fabricated from them, is very rapid.
Examples of carboxylate-containing PVOH copolymers derived from monocarboxylic acid vinyl monomers and their esters are those prepared by the hydrolysis of a vinyl acetate-acrylic acid copolymer, a vinyl acetate-crotonic acid copolymer, a vinyl acetate-methyl acrylate copolymer, a vinyl acetate-methacrylic acid copolymer, and a vinyl acetate-methyl methacrylate copolymer, all of which have excellent cold water-solubility. In fact, packaging films based on PVOH copolymers having carboxylate groups are generally considered in the art to be the most rapidly cold water-soluble films.
One of the largest markets for these films is the liquid laundry detergent market where the convenience of the unit dose concept is widely accepted and the rapid solubility of the films is particularly suited to this application.
2o However, a significant problem exists with the chemical compatibility of virtually all liquid laundry detergent formulations and most of the commercial film used to package these products. The commercial film is based on a carboxylate-containing PVOH
copolymer where the carboxylate units, if converted to carboxylic acid groups, are readily able to form stable lactones by cyclizing with adjacent hydroxyl groups. Specifically, the chemical incompatibility derives from the acid-base equilibria that exist in the liquid laundry detergent formulations and are usually in the form of amine-fatty acid equilibria andlor amine-anionic surfactant acid equilibria. Even if the detergent formulation is at an alkaline pH by virtue of the presence of a molar excess of amine, exchangeable hydrogen ions are still available to react with the carboxylate groups of the PVOH copolymer.
S~Jhen this happens, carboxylic acid groups form and they in turn will readily react with adjacent hydroxyl groups to form intramolecular lactones if the lactones have stable five-membered (gamma, y) ring structures. Other liquid products too numerous to mention may present similar chemical incompatibilities and are, therefore, addressed by the present invention.
The solubility of the polymer and hence the film is markedly affected by this reaction to form lactones; complete insolubility can occur in some cases resulting in polymer residues being attached to items of clothing at the end of a wash cycle. All the above-mentioned carboxylate-containing copolymers derived from monocarboxylic acid vinyl monomers and their esters are subject to this reversion to stable ~- lactones in the presence of hydrogen ions. There is therefore a need to provide cold water-soluble films, preferably including those based on PV~frI copolymers having carboxylate functionality (because of their fast solubility) where the functional groups of the copolymers which facilitate cold water solubility are substantially unaffected by hydrogen ions or, if chemically modified by 1o reaction with hydrogen ions, the modified functional groups do not significantly affect the water solubility of the films.
SUMMARY OF THE INVENTION
A water-soluble copolymer film is disclosed for use in making pouches to contain a liquid material, such as a liquid laundry detergent, wherein the film solubility is not significantly affected adversely by the detergent. Such film produces pouches having a greater storage shelf-life over prior art water-soluble film.
In one embodiment, the present water-soluble film comprises vinyl acetate copolymerized with itaconic acid as a second monomer to produce, after hydrolysis, a 2o polyvinyl alcohol copolymer with a degree of hydrolysis, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, from about 9~%~ to about 100%.
In several other embodiments, the second monomer may be selected from the group of monomers consisting of monocarboxylic acid vinyl monomers, their esters and anhydrides, dicarboxylic monomers having a polymerizable double bond, their esters and anhydrides, and vinyl sulfonic acid monomers and their alkali metal salts. The degree of hydrolysis for these copolymer embodiments varies.
In such embodiments where the second monomer is one of either monocarboxylic acid vinyl monomers, their esters and anhydrides, dicarboxylic monomers having a polymerizable double bond, or their esters and anhydrides, it is an aspect of the invention 3o that the monomer be specifically selected from the group consisting of vinyl acetic acid, malefic acid, monomethyl maleate, dimethyl maleate, malefic anhydride, itaconic acid, monomethyl itaconate, dimethyl itaconate, and itaconic anhydride. Most preferably, the second monomer is itaconic acid.
In other such embodiments it is an aspect of the invention that the second monomer is a vinyl sulfonic acid monomer or its alkali metal salts. Specifically, the second monomer is selected from the group of sulfonic acid monomers and their alkali metal salts consisting of vinyl sulfonic acid, allyl sulfonic acid, ethylene sulf~nic acid, ~-acrylaxnido-1-methylpropanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, 2-methylacrylanudo-2-methylpropanesulfonic acid, and 2-sulfoethyl acrylate.
ll~ost preferably, the second monomer for these embodiments is 2-acrylamido-2-methylpropanesulfonic acid.
Generally speaking, the present invention is a water-soluble copolymer film comprising vinyl acetate copolymerized with a second monomer to produce a polyvinyl alcohol copolymer having certain structural features which serve to improve the shelf life of the film, and wherein the second monomer is selected from the group consisting of monomers having carboxylate functionality or sulfonate functionality.
It is another aspect of the disclosed invention to produce a liquid product packet comprising a water-soluble film comprised of a polyvinyl alcohol copolymer wherein a comonomer of the film copolymer is selected from the group consisting of monocarboxylic acid vinyl monomers, their esters and anhydrides, dicarboxylic monomers having a polymerizable double bond, their esters and anhydrides or vinyl sulfonic acid monomers and their alkali metal salts. The present embodiment includes a quantity of a liquid product enclosed within the water-soluble film packet.
These and other objects of the invention are disclosed and claimed in the following detailed description of the invention, including the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention described herein can be more readily understood with reference to the appended drawing figures where:
FIGURE 1 is a perspective view of a test apparatus used to determine the water disintegration and dissolution times of film samples;
FIGURE 2 is a perspective view of the test apparatus and test set-up illustrating the 3o procedure for determining the water-solubility of film samples; and FIGURE 3 is a top view of the test set-up of FIGURE Z.
DETAILED DESCRIPTION OF THE INVENTION
While the invention is susceptible of embodiment in many different forms, this disclosure will describe in detail preferred embodiments of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspect of the invention to the embodiments illustrated.
In the present invention, specific monomers within three general chemical classes are selected for copolymerization with vinyl acetate such that the base-catalyzed alcoholysis products of these copolymers, which are used in the formulation of the water-soluble film, 1o retain excellent solubility performance in the presence of hydrogen ions.
The copolymers used in the formulation of the water-soluble films have one of either 1) carboxylate functionality or 2) sulfonate functionality.
1. Copolymers with Carboxylate FunctionalitX
Specific monocarboxylic acid vinyl monomers (for example, structure (a) shown 15 below) and their esters and anhydrides, and specific dicarboxylic monomers (for example, structure (b) shown below) having a polymerizable double bond and their esters and anhydrides are selected for copolymerization with vinyl acetate.
O
OH
a. Vinyl acetic acid b. Itaconic acid (Carboxylic acid vinyl monomer) (Dicarboxylic acid monomer) The base-catalyzed alcoholysis products of these copolymers, which are used in the formulation of the water-soluble film, retain carboxylate functionality in the presence of hydrogen ions because of the low steric stability, and therefore non-formation, of six-3o membered (delta, ~) lactone rings. Examples of the selected monomers are vinyl acetic acid, malefic acid, monomethyl maleate, dimethyl maleate, malefic anhydride, itaconic acid, monomethyl itaconate, dimethyl itaconate and itaconic anhydride.
By way of illustration and comparison, structures (c) and (d) are provided to show the statically favored y-lectors and the non-favored ~-lectors, respectively, as they would, . ~, form on the polyvinyl alcohol polymer bacl~bone:
s c. y-Lactone d. S-Lactone A carboxylate-containing PVOH copolymer based on the copolymerization of, for example, acrylic acid with vinyl acetate would have its carboxylate unit directly attached to the polymer backbone and th~eefore, when in the acid form, able to form a stable five-membered y- lectors (structure (c) above) by cyclizing with an adjacent hydroxyl group. In contrast, a copolymer derived from vinyl acetic acid would have a methylene group between the polymer backbone and the carboxylate unit; in this,case, only a six-membered S- lectors (structure (d) above) could form and this is not a statically favorable entity. In the case of others such as itaconic acid, a.dicarboxylic acid, one of the carboxylate groups can ultimately form a y- lectors but the other can only form a 8- lectors; the latter therefore remains intact and film solubility is preserved.
In the present invention, the preferred monomer for copolymerization with vinyl acetate from the group of monomers providing carboxylate functionality is itaconic acid.
The preferred water-soluble film is therefore based on a vinyl alcohol-co-itaconic acid (sodium salt) copolymer.
Copolymer Synthesis The vinyl acetate-co-itaconic acid copolymer is prepared under nitrogen, and in methanol as solvent, using 2,2'-azobis(isobutyronitrile) (AIBl~T) as initiator. Alcoholysis of this copolymer is carried out in methanolic sodium hydroxide and the recovered dlinyl alcohol-co-itaconic acid (sodie~m salt) copolyaner is ground, washed to remove residual sodium acetate, and dried. These reactions are known in the art and have been reported, for example, by Moritani et. al (Polymer Preprints, Japan; 31, 126 (1982)) The preferred degree of polymerization of the vinyl alcohol-co-itaconic acid (sodium salt) copolymer is such that the viscosity of a 4%~ aqueous solution at 20°C is within a range of from about 5 to about 45 I~a.s (cps), including all ranges and combination of ranges which are a subset thereof. fore preferred is a range of 11- 30 l~a.s and especially preferred is a range of 15 - 25 I~a.s.
The preferred level of incorporation of itaconic acid comonomer in the vinyl alcohol-co-itaconic acid (sodium salt) copolymer, expressed as a mole percentage, is within the range of from about 1.5 to about 11 mole%, including all ranges and combination of ranges which are a subset thereof. ll~ore preferred is a range of 2.5 - ~.5 mole%~
and especially preferred is a range of 4 - 6 mole%.
The preferred degree of hydrolysis of the vinyl alcohol-co-itaconic acid (sodium salt) copolymer of the present invention, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, is within the range of from about 9~ to 100%.
2. Copolymers with Sulfonate Functionalitx Specific vinyl sulfonic acid monomers and their alkali metal salts (for example, structure (e) below) are selected for copolymerization with vinyl acetate; the base-catalyzed alcoholysis products of these copolymers, which are used in the formulation of the water-soluble film, are vinyl alcohol-sulfonate salt copolymers which are rapidly soluble.
O
ONa O
e. Vinyl sulfonic acid sodium salt The sulfonate group may revert to sulfonic acid in the presence of hydrogen ions but the sulfonic acid group still provides for excellent cold water solubility of the film.
Examples of the selected sulfonic acid monomers (and/or their alkali metal salts) include vinyl sulfonic acid, allyl sulfonic acid, ethylene sulfonic acid, 2-acrylamido-3o methylpropanesulfonic acid, 2-acrylamido-2-methylpropanesufonic acid, 2-methacrylamido-2-methylpropanesulfonic acid and 2-sulfoethyl acrylate.
The preferred monomer for copolymerization with vinyl acetate from the group of monomers providing sulphonate functionality is the sodium salt of 2-acrylamido-methylpropanesulfonic acid (AMPS) and the preferred copolymer for incorporation into the water-soluble film is therefore a vinyl alcohol-co-AMPS (sodium salt) copolymer.
~opolyarner ~yutlne~i~
The vinyl acetate-co-Al'~~T'1 S copolymer is prepared under nitrogen in methanol as solvent, using 2,2'-azobis(isobutyronitrile) (AI~1~T) as initiator.
Alcoholysis of this copolymer is carried out in methanolic sodium hydroxide and the recovered vinyl alcohol-co-A1MPS (sodium salt) copolymer is ground, washed to remove residual sodium acetate, and dried. These reactions are known in the art and have been reported, for example, by Moritani and ~amauchi (Polymer, 39 (3), 553 - 557 (1998)).
1o The preferred degree of polymerization of the vinyl alcohol-co-AMPS (sodium salt) copolymer is such that the viscosity of a 4% aqueous solution at 20°C
is in the range of from about 3 to about 18 MPa.s (cps), including all ranges and combination of ranges which are a subset thereof. More preferred is a range of from about 4 to about 12 MPa.s.
The preferred level of incorporation of AMPS comonomer in the vinyl alcohol-co-15 AMPS (sodium salt) copolymer, expressed as a mole percentage, is in the range of from about 1 to about 8 mole%, including all ranges and combination of ranges which are a subset thereof. More preferred is a range of from about 2.5 to about 5 mole%.
The preferred degree of hydrolysis of the vinyl alcohol-co-AMPS (sodium salt) copolymer, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, 2o is in the range of from about 90 to about 99%. More preferred is a range of from about 94 to about 98%.
Water-Soluble Film Formulation-Additives The preferred amount of the copolymer with carboxylate or sulfonate functionality in the water-soluble film of the present invention is in the range of from about 40% to about 25 90% by weight, including all ranges and combination of ranges therein. More preferably the amount of these copolymers is in the range of from about 60% to about 80% by weight.
The water-soluble film of the present invention, in addition to the copolymer with carboxylate or sulfonate functionality, may contain plasticizers, lubricants, release agents, fillers, extenders, antibloclcing agents, detackifying agents, antifoams and other functional 3o ingredients. Suitable plasticizers include, but are not limited to, glycerin, diglycerin, sorbitol, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, polyethylene glycols up to 400 MW, neopentyl glycol, trimethylolpropane, polyether polyols and ethanolamines.
Preferred plasticizers are glycerin, triethyleneglycol, propylene glycol and trimethylolpropane. The preferred amount of plasticizer incorporated in the water-soluble film of the present invention is in the range of from about 5% to about 30% by weight, more preferably in the range of from about 12% to about 20% by weight.
Suitable surfactants may include the nonionic, cationic, anionic and zwitterionic classes. Preferably, the surfactants will be of the nonionic, cationic or zwitterionic classes or combinations of these. Suitable surfactants include, but are not limited to, polyoxyethylenated polyoxypropylene glycols, alcohol ethoxylates, alkylphenol ethoxylates, tertiary acetylenic glycols and alkanolamides (nonionics), polyoxyethylenated amines, l0 quaternary ammonium salts and quaternized polyoxyethylenated amines (cationics), and amine oxides, N-alkylbetaines and sulfobetaines (zwitterionics). Preferred surfactants are alcohol ethoxylates, quaternary ammonium salts and amine oxides. The preferred amount of surfactant in the water-soluble film of the present invention is in the range of from about 0.01 % to about 1 % by weight, more preferably from about 0.1 % to about 0.6%
by weight.
15 Suitable lubricants/release agents include, but are not limited to, fatty acids and their salts, fatty alcohols, fatty esters, fatty amines, fatty amine acetates and fatty amides.
Preferred lubricants/release agents are fatty acids, fatty acid salts,, and fatty amine acetates.
The preferred amount of lubricant/release agent in the water-soluble film of the present invention is within the range of from about 0.02% to about 1.5% by weight, more preferably 2o from about 0.04% to about 0.15% by weight.
Suitable fillers/extenders/antiblocking agents/detackifying agents include, but are not limited to, starches, modified starches, crosslinked polyvinylpyrrolidone, crosslinked cellulose, microcrystalline cellulose, silica, metallic oxides, calcium carbonate, talc and mica. Preferred materials are starches, modified starches and silica. The preferred amount 25 of filler/extender/antiblocking agent/detackifying agent in the water-soluble film of the present invention is in the range of from about 0.1% to about 25% by weight, more preferably from about 1% to about 15% by weight. In the absence of starch, the preferred range for a suitable filler/extender/aniblocking agent/detackifying agent is from about 1 % to about 5% by weight.
3o Suitable antifoams include, but are not limited to, those based on polydimethylsiloxanes and hydrocarbon blends. The preferred amount of antifoam in the water-soluble film of the present invention is in the range of from about 0.001% to about 0.5%, and more preferably from about 0.01 % to about 0.1 % by weight.
After formulation, the desired film thickness is within the range of from about 5 to about 200~.m, preferably within the range of from about 20 to about 100,um, and most preferably from about 40 to about 85~.m.
~onap~~°n~o~ Zf'e~t 0f Falm: pct-ufa ~~nd ~'r~ceei~rc The data below represents comparative chemical compatibility testing of two PV~H
copolymer films. The first film is a vinyl alcohol-co-itaconic acid (sodium salt) copolymer-based film representing the invention of the present application (Film 1), while the second film is based on a hydrolysed vinyl acetate - methyl acrylate copolymer (Film 2).
The two films were cast with similar additives as detailed above to create workable 1o film samples having the characteristics detailed in Table 1. Film thicknesses measured approximately 76 microns. Pouches having dimensions of approximately 7.5cm x 7.5cm (about 3 in. x 3 in.) and open on one side were prepared using conventional heat-sealing equipment.
TABLE 1: Film Characteristics 15 Copolymer properties: Film 1 Film 2 Viscosity (cps) 20 20 Mole% comonomer 5.4 5.1 Degree of Hydrolysis(%) 99.8 99.8 20 To each pouch was added a fill of 50m1 of Ariel Essential (Procter &
Gamble, Fabric & Home Care Products - Europe), a liquid laundry detergent and the final heat seal made.
While the following test specifically references the packaging of a liquid laundry detergent, it should be understood that the present invention applies equally to the packaging of other liquid products having similar chemical incompatibilities with the prior art films.
25 Compatibility testing was performed over a period of five weeks with weekly testing of film solubility in accordance with MonoSol Standard Test Method MSTM 205. Between testing periods pouches were contained in HDPE screw-t~p jars at storage conditions of 38°C/80%~I~H. The test method is used to determine the time required for a water-soluble film to break apart (disintegrate) and its subsequent dissolution time under controlled 30 conditions of water temperature and agitation. Before film solubility testing, the pouch was opened, the liquid detergent was discarded, and the film was cleaned by wiping with an absorbent paper towel.
The test procedure is disclosed with reference to appended FIGURES 1-3.
M~n0S~1 Test Method 205 (M~Tl~ 205) ~PP~P~~TUS ~ MATERS:
600 rnL Eeaker 12 Magnetic Stirrer 14. (L,abline Model No. 1250 or equivalent) Magnetic Stirring Rod 16 (5 cm) Thermometer (0 to 100°C, ~ 1 °C) Template, Stainless Steel (3.~ cm x 3.2 cm) Timer, (0-300 seconds, accurate to the nearest second) Polaroid 35mm Slide Mount 20 (or equivalent) MonoSol 35mm Slide Mount Holder 25 (or equivalent, see FIGURE 1) Distilled Water TEST SPECnVIEN:
1. Cut three test specimens from film sample using stainless steel template (i.e., 3.~ cm x 3.2 cm specimen). If cut from a film web, specimens should be cut from areas of web evenly spaced along the transverse direction of the web.
2. Lock each specimen in a separate 35 mm slide mount 20.
O
ONa O
e. Vinyl sulfonic acid sodium salt The sulfonate group may revert to sulfonic acid in the presence of hydrogen ions but the sulfonic acid group still provides for excellent cold water solubility of the film.
Examples of the selected sulfonic acid monomers (and/or their alkali metal salts) include vinyl sulfonic acid, allyl sulfonic acid, ethylene sulfonic acid, 2-acrylamido-3o methylpropanesulfonic acid, 2-acrylamido-2-methylpropanesufonic acid, 2-methacrylamido-2-methylpropanesulfonic acid and 2-sulfoethyl acrylate.
The preferred monomer for copolymerization with vinyl acetate from the group of monomers providing sulphonate functionality is the sodium salt of 2-acrylamido-methylpropanesulfonic acid (AMPS) and the preferred copolymer for incorporation into the water-soluble film is therefore a vinyl alcohol-co-AMPS (sodium salt) copolymer.
~opolyarner ~yutlne~i~
The vinyl acetate-co-Al'~~T'1 S copolymer is prepared under nitrogen in methanol as solvent, using 2,2'-azobis(isobutyronitrile) (AI~1~T) as initiator.
Alcoholysis of this copolymer is carried out in methanolic sodium hydroxide and the recovered vinyl alcohol-co-A1MPS (sodium salt) copolymer is ground, washed to remove residual sodium acetate, and dried. These reactions are known in the art and have been reported, for example, by Moritani and ~amauchi (Polymer, 39 (3), 553 - 557 (1998)).
1o The preferred degree of polymerization of the vinyl alcohol-co-AMPS (sodium salt) copolymer is such that the viscosity of a 4% aqueous solution at 20°C
is in the range of from about 3 to about 18 MPa.s (cps), including all ranges and combination of ranges which are a subset thereof. More preferred is a range of from about 4 to about 12 MPa.s.
The preferred level of incorporation of AMPS comonomer in the vinyl alcohol-co-15 AMPS (sodium salt) copolymer, expressed as a mole percentage, is in the range of from about 1 to about 8 mole%, including all ranges and combination of ranges which are a subset thereof. More preferred is a range of from about 2.5 to about 5 mole%.
The preferred degree of hydrolysis of the vinyl alcohol-co-AMPS (sodium salt) copolymer, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, 2o is in the range of from about 90 to about 99%. More preferred is a range of from about 94 to about 98%.
Water-Soluble Film Formulation-Additives The preferred amount of the copolymer with carboxylate or sulfonate functionality in the water-soluble film of the present invention is in the range of from about 40% to about 25 90% by weight, including all ranges and combination of ranges therein. More preferably the amount of these copolymers is in the range of from about 60% to about 80% by weight.
The water-soluble film of the present invention, in addition to the copolymer with carboxylate or sulfonate functionality, may contain plasticizers, lubricants, release agents, fillers, extenders, antibloclcing agents, detackifying agents, antifoams and other functional 3o ingredients. Suitable plasticizers include, but are not limited to, glycerin, diglycerin, sorbitol, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, polyethylene glycols up to 400 MW, neopentyl glycol, trimethylolpropane, polyether polyols and ethanolamines.
Preferred plasticizers are glycerin, triethyleneglycol, propylene glycol and trimethylolpropane. The preferred amount of plasticizer incorporated in the water-soluble film of the present invention is in the range of from about 5% to about 30% by weight, more preferably in the range of from about 12% to about 20% by weight.
Suitable surfactants may include the nonionic, cationic, anionic and zwitterionic classes. Preferably, the surfactants will be of the nonionic, cationic or zwitterionic classes or combinations of these. Suitable surfactants include, but are not limited to, polyoxyethylenated polyoxypropylene glycols, alcohol ethoxylates, alkylphenol ethoxylates, tertiary acetylenic glycols and alkanolamides (nonionics), polyoxyethylenated amines, l0 quaternary ammonium salts and quaternized polyoxyethylenated amines (cationics), and amine oxides, N-alkylbetaines and sulfobetaines (zwitterionics). Preferred surfactants are alcohol ethoxylates, quaternary ammonium salts and amine oxides. The preferred amount of surfactant in the water-soluble film of the present invention is in the range of from about 0.01 % to about 1 % by weight, more preferably from about 0.1 % to about 0.6%
by weight.
15 Suitable lubricants/release agents include, but are not limited to, fatty acids and their salts, fatty alcohols, fatty esters, fatty amines, fatty amine acetates and fatty amides.
Preferred lubricants/release agents are fatty acids, fatty acid salts,, and fatty amine acetates.
The preferred amount of lubricant/release agent in the water-soluble film of the present invention is within the range of from about 0.02% to about 1.5% by weight, more preferably 2o from about 0.04% to about 0.15% by weight.
Suitable fillers/extenders/antiblocking agents/detackifying agents include, but are not limited to, starches, modified starches, crosslinked polyvinylpyrrolidone, crosslinked cellulose, microcrystalline cellulose, silica, metallic oxides, calcium carbonate, talc and mica. Preferred materials are starches, modified starches and silica. The preferred amount 25 of filler/extender/antiblocking agent/detackifying agent in the water-soluble film of the present invention is in the range of from about 0.1% to about 25% by weight, more preferably from about 1% to about 15% by weight. In the absence of starch, the preferred range for a suitable filler/extender/aniblocking agent/detackifying agent is from about 1 % to about 5% by weight.
3o Suitable antifoams include, but are not limited to, those based on polydimethylsiloxanes and hydrocarbon blends. The preferred amount of antifoam in the water-soluble film of the present invention is in the range of from about 0.001% to about 0.5%, and more preferably from about 0.01 % to about 0.1 % by weight.
After formulation, the desired film thickness is within the range of from about 5 to about 200~.m, preferably within the range of from about 20 to about 100,um, and most preferably from about 40 to about 85~.m.
~onap~~°n~o~ Zf'e~t 0f Falm: pct-ufa ~~nd ~'r~ceei~rc The data below represents comparative chemical compatibility testing of two PV~H
copolymer films. The first film is a vinyl alcohol-co-itaconic acid (sodium salt) copolymer-based film representing the invention of the present application (Film 1), while the second film is based on a hydrolysed vinyl acetate - methyl acrylate copolymer (Film 2).
The two films were cast with similar additives as detailed above to create workable 1o film samples having the characteristics detailed in Table 1. Film thicknesses measured approximately 76 microns. Pouches having dimensions of approximately 7.5cm x 7.5cm (about 3 in. x 3 in.) and open on one side were prepared using conventional heat-sealing equipment.
TABLE 1: Film Characteristics 15 Copolymer properties: Film 1 Film 2 Viscosity (cps) 20 20 Mole% comonomer 5.4 5.1 Degree of Hydrolysis(%) 99.8 99.8 20 To each pouch was added a fill of 50m1 of Ariel Essential (Procter &
Gamble, Fabric & Home Care Products - Europe), a liquid laundry detergent and the final heat seal made.
While the following test specifically references the packaging of a liquid laundry detergent, it should be understood that the present invention applies equally to the packaging of other liquid products having similar chemical incompatibilities with the prior art films.
25 Compatibility testing was performed over a period of five weeks with weekly testing of film solubility in accordance with MonoSol Standard Test Method MSTM 205. Between testing periods pouches were contained in HDPE screw-t~p jars at storage conditions of 38°C/80%~I~H. The test method is used to determine the time required for a water-soluble film to break apart (disintegrate) and its subsequent dissolution time under controlled 30 conditions of water temperature and agitation. Before film solubility testing, the pouch was opened, the liquid detergent was discarded, and the film was cleaned by wiping with an absorbent paper towel.
The test procedure is disclosed with reference to appended FIGURES 1-3.
M~n0S~1 Test Method 205 (M~Tl~ 205) ~PP~P~~TUS ~ MATERS:
600 rnL Eeaker 12 Magnetic Stirrer 14. (L,abline Model No. 1250 or equivalent) Magnetic Stirring Rod 16 (5 cm) Thermometer (0 to 100°C, ~ 1 °C) Template, Stainless Steel (3.~ cm x 3.2 cm) Timer, (0-300 seconds, accurate to the nearest second) Polaroid 35mm Slide Mount 20 (or equivalent) MonoSol 35mm Slide Mount Holder 25 (or equivalent, see FIGURE 1) Distilled Water TEST SPECnVIEN:
1. Cut three test specimens from film sample using stainless steel template (i.e., 3.~ cm x 3.2 cm specimen). If cut from a film web, specimens should be cut from areas of web evenly spaced along the transverse direction of the web.
2. Lock each specimen in a separate 35 mm slide mount 20.
3. Fill beaker 12 with 500 mL of distilled water. Measure water temperature with thermometer and, if necessary, heat or cool water to maintain temperature at 20° C
(about 6~ °F).
(about 6~ °F).
4. Mark height of column of water. Place magnetic stirrer 14 on base 27 of holder 25.
Place beaker 12 on magnetic stirrer 14, add magnetic stirring rod 16 to beaker 12, turn on stirrer 14, and adjust stir speed until a vortex develops which is approximately one-fifth the height of the water column. Mark depth of vortex.
Place beaker 12 on magnetic stirrer 14, add magnetic stirring rod 16 to beaker 12, turn on stirrer 14, and adjust stir speed until a vortex develops which is approximately one-fifth the height of the water column. Mark depth of vortex.
5. Secure the 35 mm slide mount 20 in the alligator clamp 26 of the MonoSol 35mm slide mount holder 25 (FIGURE 1) such that the long end 21 of the slide mount 20 is 3o parallel to the water surface, as illustrated in FIGURE 2. The depth adjuster 28 of the holder 25 should be set so that when dropped, the end of the clamp 26 will be 0.6 cm below the surface of the water. ~ne of the short sides 23 of the slide mount 20 should be next to the side of the beaker 12 with the other positioned directly over the center of the stirring rod 16 such that the film surface is perpendicular to the flow of the water, as illustrated in FIGURE 3.
6. In one motion, drop the secured slide and clamp into the water and start the timer.
Disintegration occurs when the film breaks apart. When all visible film is released from the slide mount, raise the slide out of the water while continuing to monitor the solution for undissolved film fragments. Dissolution occurs when all film fragments are no longer visible and the solution becomes clear.
I~ATI~ I~EC~I~DIIITC~:
The results should include the following:
complete sample identification;
individual and average disintegration and dies~luti~n times; and ~ water temperature at which the samples were tested.
Exposed film disintegration time (in seconds) and the time for complete dissolution (in seconds) were obtained (e.g., 27s/50s), with the results of the five week testing being reported in Table 2 below.
TABLE 2: Comparison Test Results Initial Solubility 1 Week 2 Weeks 3 Weeks 4 Weeks 5 Weeks Film 1 27s/50s 23s/53s 31s/86s 44s/129s 43s/94s 35s/75s 2o Film 2 33s158s 56s/117s 67s/152s 75s/192s 86s/235s 95s/251s Solubility time increases for Filrn 1 are 30% for disintegration-from 27 seconds to 35 seconds-and 50% for complete dissolution-from 50 seconds to 75 seconds-reflecting the conversion of one of the carboxylate groups deriving from the itaconate moeity to a Y-lactone while the other carboxylate group remains unaffected by hydrogen ions in the detergent formulation. In contrast, the solubility time increases for Film 2 are 188% for disintegration-from 33 seconds to 95 seconds-and 333% for complete dissolution-from 58 seconds to 251 seconds-reflecting a substantial conversion of the carboxylate groups present in the copolymer of Film 2, all of which are capable of forming 'y-lactones.
3o Although complete dissolution of Film 2 eventually occurs at 10°C, this substantial conversion of carboxylate units to lactone units is known to have the potential to result in significant polymer residues after laundry wash cycles at higher temperatures While specific embodiments have been illustrated and described, numerous modifications are possible v~ithout departing from the spirit of the invention, and the scope of protection is only limited by the scope of the accompanying claims.
Disintegration occurs when the film breaks apart. When all visible film is released from the slide mount, raise the slide out of the water while continuing to monitor the solution for undissolved film fragments. Dissolution occurs when all film fragments are no longer visible and the solution becomes clear.
I~ATI~ I~EC~I~DIIITC~:
The results should include the following:
complete sample identification;
individual and average disintegration and dies~luti~n times; and ~ water temperature at which the samples were tested.
Exposed film disintegration time (in seconds) and the time for complete dissolution (in seconds) were obtained (e.g., 27s/50s), with the results of the five week testing being reported in Table 2 below.
TABLE 2: Comparison Test Results Initial Solubility 1 Week 2 Weeks 3 Weeks 4 Weeks 5 Weeks Film 1 27s/50s 23s/53s 31s/86s 44s/129s 43s/94s 35s/75s 2o Film 2 33s158s 56s/117s 67s/152s 75s/192s 86s/235s 95s/251s Solubility time increases for Filrn 1 are 30% for disintegration-from 27 seconds to 35 seconds-and 50% for complete dissolution-from 50 seconds to 75 seconds-reflecting the conversion of one of the carboxylate groups deriving from the itaconate moeity to a Y-lactone while the other carboxylate group remains unaffected by hydrogen ions in the detergent formulation. In contrast, the solubility time increases for Film 2 are 188% for disintegration-from 33 seconds to 95 seconds-and 333% for complete dissolution-from 58 seconds to 251 seconds-reflecting a substantial conversion of the carboxylate groups present in the copolymer of Film 2, all of which are capable of forming 'y-lactones.
3o Although complete dissolution of Film 2 eventually occurs at 10°C, this substantial conversion of carboxylate units to lactone units is known to have the potential to result in significant polymer residues after laundry wash cycles at higher temperatures While specific embodiments have been illustrated and described, numerous modifications are possible v~ithout departing from the spirit of the invention, and the scope of protection is only limited by the scope of the accompanying claims.
Claims (33)
1. A water-soluble packet, comprising:
a copolymer film comprising a hydrolyzed copolymer of vinyl acetate and a second monomer, the resultant polyvinyl alcohol copolymer having a degree of hydrolysis, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, in the range of from about 90% to about 100%, wherein the second monomer is selected from the group consisting of monocarboxylic acid vinyl monomers, their esters and anhydrides, dicarboxylic monomers having a polymerizable double bond, their esters and anhydrides, vinyl sulfonic acid monomers, and alkali metal salts of vinyl sulfonic acid monomers, and combinations of the foregoing; and a quantity of liquid material contained within the packet in direct contact with said copolymer film.
a copolymer film comprising a hydrolyzed copolymer of vinyl acetate and a second monomer, the resultant polyvinyl alcohol copolymer having a degree of hydrolysis, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, in the range of from about 90% to about 100%, wherein the second monomer is selected from the group consisting of monocarboxylic acid vinyl monomers, their esters and anhydrides, dicarboxylic monomers having a polymerizable double bond, their esters and anhydrides, vinyl sulfonic acid monomers, and alkali metal salts of vinyl sulfonic acid monomers, and combinations of the foregoing; and a quantity of liquid material contained within the packet in direct contact with said copolymer film.
2. The water-soluble packet of claim 1, wherein the liquid material comprises a cleaning concentrate.
3. The water-soluble packet of claim 2, wherein the cleaning concentrate comprises laundry detergent.
4. The water-soluble packet of any one of the preceding claims, wherein the liquid material has an alkaline pH.
5. The water-soluble packet of any one of the preceding claims, wherein the second monomer is selected from the group consisting of monocarboxylic acid vinyl monomers, their esters and anhydrides, dicarboxylic monomers having a polymerizable double bond, their esters and anhydrides, and combinations of the foregoing.
6. The water-soluble packet according to any one of the preceding claims, wherein the second monomer is selected from the group consisting of vinyl acetic acid, maleic acid, monomethyl maleate, dimethyl maleate, maleic anhydride, itaconic acid, monomethyl itaconate, dimethyl itaconate, and itaconic anhydride.
7. The water-soluble packet of claim 6, wherein the second monomer is itaconic acid.
8. The water-soluble packet of claim 7, wherein the level of incorporation of itaconic acid comonomer in the vinyl alcohol-co-itaconic acid copolymer, expressed as a mole percentage, is within the range of from about 1.5 to about 11 mole%,
9. The water-soluble packet of claim 8, wherein the level of incorporation of itaconic acid comonomer in the vinyl alcohol-co-itaconic acid copolymer, expressed as a mole percentage, is within the range of from about 2.5 to about 8.5 mole%.
10. The water-soluble packet of claim 9, wherein the level of incorporation of itaconic acid comonomer in the vinyl alcohol-co-itaconic acid copolymer, expressed as a mole percentage, is within the range of from about 4 to about 6 mole%.
11. The water-soluble packet of any one of claims 1 to 4, wherein the second monomer is selected from the group consisting of vinyl sulfonic acid monomers and their alkali metal salts.
12. The water-soluble packet of claim 11, wherein the second monomer is selected from the group of sulfonic acid monomers consisting of vinyl sulfonic acid, allyl sulfonic acid, ethylene sulfonic acid, 2-acrylamido-1-methylpropanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, 2-methyl acrylamido-2-methylpropanesulfonic acid, 2-sulfoethyl acrylate, their alkali metal salts, and combinations of the foregoing.
13. The water-soluble packet of claim 12, wherein the second monomer is an alkali metal salt of 2-acrylamido-2-methylpropanesulfonic acid.
14. The water-soluble packet of claim 13, wherein the second monomer is the sodium salt of 2-acrylamido-2-methylpropanesulfonic acid.
15. The water-soluble packet of any one of claims 12 to 14, wherein the level of incorporation of the second monomer in the copolymer, expressed as a mole percentage, is in the range of from about 1 to about 8 mole%.
16. The water-soluble packet of claim 15, wherein the level of incorporation of the second monomer in the copolymer, expressed as a mole percentage, is in the range of from about 2.5 to about 5 mole%.
17. The water-soluble packet of any one of the preceding claims, wherein the degree of polymerization of the copolymer is such that the viscosity of a 4% aqueous solution at 20 °C is in a range of from about 3 to about 18 MPa.s (cps).
18. The water-soluble packet of claim 17, wherein the degree of polymerization of the copolymer is such that the viscosity of a 4% aqueous solution at 20 °C
is in a range of from about 4 to about 12 MPa.s.
is in a range of from about 4 to about 12 MPa.s.
19. A water-soluble copolymer film packet comprising:
a hydrolyzed copolymer of vinyl acetate and a second monomer, the resultant polyvinyl alcohol copolymer having a degree of hydrolysis, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, of from about 90% to 100%;
an initial disintegration time at 10 °C of less than 60 seconds; and a disintegration time increase after contacting a liquid component contained therein of no more than 50%.
a hydrolyzed copolymer of vinyl acetate and a second monomer, the resultant polyvinyl alcohol copolymer having a degree of hydrolysis, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, of from about 90% to 100%;
an initial disintegration time at 10 °C of less than 60 seconds; and a disintegration time increase after contacting a liquid component contained therein of no more than 50%.
20. The water-soluble copolymer film packet of claim 19, wherein the second monomer is selected from the group consisting of monomers having carboxylate functionality and monomers having sulfonate functionality.
21. The water-soluble copolymer film packet of claim 20, wherein the second monomer is selected from the group consisting of vinyl acetic acid, maleic acid, monomethyl maleate, dimethyl maleate, maleic anhydride, itaconic acid, monomethyl itaconate, dimethyl itaconate, itaconic anhydride, and combinations thereof.
22. The water-soluble copolymer film packet of claim 21, wherein the second monomer comprises itaconic acid.
23. The water-soluble copolymer film packet of claim 20, wherein the second monomer is selected from the group consisting of vinyl sulfonic acid monomers and their alkali metal salts.
24. The water-soluble copolymer film packet of claim 23, wherein the second monomer comprises an alkali metal salt of 2-acrylamido-2-methylpropanesulfonic acid.
25. The water-soluble packet of claim 24, wherein the second monomer is the sodium salt of 2-acrylamido-2-methylpropanesulfonic acid.
26. The water-soluble copolymer film packet of any one of claims 19 to 25, wherein the degree of polymerization of the copolymer is such that the viscosity of a 4%
aqueous solution at 20 °C is within a range of from about 5 to about 45 MPa.s (cps).
aqueous solution at 20 °C is within a range of from about 5 to about 45 MPa.s (cps).
27. The water-soluble copolymer film packet of claim 26, wherein the degree of polymerization of the copolymer is such that the viscosity of a 4%
aqueous solution at 20 °C is within a range of from about 11 to about 30 MPa.s.
aqueous solution at 20 °C is within a range of from about 11 to about 30 MPa.s.
28. The water-soluble copolymer film packet of claim 27, wherein the degree of polymerization of the copolymer is such that the viscosity of a 4%
aqueous solution at 20 °C,is within a range of from about 15 to about 25 MPa.s.
aqueous solution at 20 °C,is within a range of from about 15 to about 25 MPa.s.
29. The water-soluble copolymer film packet of claim 28, wherein the degree of polymerization of the copolymer is such that the viscosity of a 4%
aqueous solution at 20 °C is in a range of from about 3 to about 18 MPa.s.
aqueous solution at 20 °C is in a range of from about 3 to about 18 MPa.s.
30. The water-soluble copolymer film packet of claim 29, wherein the degree of polymerization of the copolymer is such that the viscosity of a 4%
aqueous solution at 20 °C is in a range of from about 4 to about 12 MPa.s.
aqueous solution at 20 °C is in a range of from about 4 to about 12 MPa.s.
31. The water-soluble copolymer film packet according to any one of claims 19 to 30, wherein the liquid component comprises a cleaning concentrate.
32. The water-soluble copolymer film packet of claim 31, wherein the cleaning concentrate comprises laundry detergent.
33. The water-soluble copolymer film packet according to any one of claims 19 to 32, wherein the liquid component has an alkaline pH
Applications Claiming Priority (3)
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US10/392,030 | 2003-03-19 | ||
US10/392,030 US7022656B2 (en) | 2003-03-19 | 2003-03-19 | Water-soluble copolymer film packet |
PCT/US2004/008231 WO2004085600A1 (en) | 2003-03-19 | 2004-03-18 | Polyvinyl alcohol copolymer film for packaging liquid products and having an improved shelf-life |
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US (3) | US7022656B2 (en) |
EP (1) | EP1604004A1 (en) |
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AU (2) | AU2004223907A1 (en) |
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US10829621B2 (en) | 2013-01-11 | 2020-11-10 | Monosol, Llc | Edible water-soluble film |
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- 2004-03-18 JP JP2006507299A patent/JP2006521449A/en active Pending
- 2004-03-18 CA CA002519576A patent/CA2519576A1/en not_active Abandoned
- 2004-03-18 WO PCT/US2004/008231 patent/WO2004085600A1/en active Search and Examination
- 2004-03-18 CN CNA200480009616XA patent/CN1771319A/en active Pending
- 2004-03-18 AU AU2004223907A patent/AU2004223907A1/en not_active Abandoned
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US10829621B2 (en) | 2013-01-11 | 2020-11-10 | Monosol, Llc | Edible water-soluble film |
US11945936B2 (en) | 2013-01-11 | 2024-04-02 | Monosol, Llc | Edible water-soluble film |
Also Published As
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US7022656B2 (en) | 2006-04-04 |
US7642226B2 (en) | 2010-01-05 |
US6787512B1 (en) | 2004-09-07 |
CN1771319A (en) | 2006-05-10 |
EP1604004A1 (en) | 2005-12-14 |
AU2004223907A1 (en) | 2004-10-07 |
US20040186034A1 (en) | 2004-09-23 |
US20060148668A1 (en) | 2006-07-06 |
WO2004085600A1 (en) | 2004-10-07 |
JP2006521449A (en) | 2006-09-21 |
AU2009201504A1 (en) | 2009-05-14 |
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