CA2455583A1 - Oxygen-scavenging resin compositions and containers having low haze and related methods - Google Patents

Oxygen-scavenging resin compositions and containers having low haze and related methods Download PDF

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Publication number
CA2455583A1
CA2455583A1 CA002455583A CA2455583A CA2455583A1 CA 2455583 A1 CA2455583 A1 CA 2455583A1 CA 002455583 A CA002455583 A CA 002455583A CA 2455583 A CA2455583 A CA 2455583A CA 2455583 A1 CA2455583 A1 CA 2455583A1
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Prior art keywords
particles
oxygen
microns
less
scavenging
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French (fr)
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CA2455583C (en
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Deborah Tung
Edwin Sisson
Roy Leckonby
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Multisorb Technologies Inc
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Individual
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Priority claimed from US09/916,671 external-priority patent/US6780916B2/en
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/34Silicon-containing compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B29C48/023Extruding materials comprising incompatible ingredients
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/285Feeding the extrusion material to the extruder
    • B29C48/288Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/24Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
    • B65D81/26Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators
    • B65D81/266Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00Processes of treating or compounding macromolecular substances
    • C08J3/20Compounding polymers with additives, e.g. colouring
    • C08J3/203Solid polymers with solid and/or liquid additives
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00Processes of treating or compounding macromolecular substances
    • C08J3/20Compounding polymers with additives, e.g. colouring
    • C08J3/22Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/226Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/02Elements
    • C08K3/08Metals
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20Oxides; Hydroxides
    • C08K3/22Oxides; Hydroxides of metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/002Physical properties
    • C08K2201/005Additives being defined by their particle size in general
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352Polymer or resin containing [i.e., natural or synthetic]
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1355Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1355Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
    • Y10T428/1359Three or more layers [continuous layer]
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1397Single layer [continuous layer]

Abstract

A resin composition provides good optical properties when stretched and efficient oxygen-scavenging, the resin composition comprising a film-forming polyester and an effective amount of oxygen-scavenging particles, wherein the particles have a particle size distribution such that particles of less than about 25 microns in size do not exceed a concentration defined by a formula that includes the apparent density of the particles. A container provides effective oxygen-scavenging functionality, while having low haze. A method is also provided for incorporating high levels of oxygen-scavenging particles into a film-forming polyester resin composition with low haze when stretched.

Claims (78)

1. A resin composition comprising:
a film.-forming polyester; and an effective amount of oxygen-scavenging particles comprising at least one oxygen-scavenging element capable of reacting with molecular oxygen; wherein the particles have a particle size distribution, such that particles of less than about 25 microns in size are present, but do not exceed a concentration defined by the formula ppm=512.3 x d wherein ppm, is the approximate concentration of particles of less than about 25 microns in size in pairs per million by weight, and d is the apparent density of the particles of less than about 25 microns in size in grams per cubic centimeter.
2. The resin composition of claim. 1, rnrherein said polyester comprises linear polyesters or branched polyesters.
3. The resin composition of claim 1, wherein said polyester comprises polyethylene terephthalate, copolymers of polyethylene terephthalate, polyethylene naphthaiate, copolymers of polyerhylene naphthalate, polyburylene terephthalate, copolymers of polybutylene terephthalate, polytrimethylene terephthalare, or copolymers of polytrimethylene terephthalate.
4. The resin composition of claim 1, wherein said oxygen-scavenoino element comprises calcium, magnesium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, silver, zinc, tin, aluminum, antimony, germanium, silicon, lead, cadmium, rhodium, or combinations thereof.
5. The resin composition of claim 1, wherein said oxygen-scavenging element comprises iron.
6. The resin composition of claim 1, wherein said effective amount of oxygen-scavenging particles is from about 50 to about 2500 parts per million by weight of the resin.
7. The resin composition of claim 1, wherein, said oxygen-scavenging particles have a particle size range of about 20 to about 70 microns.
8. The resin composition of claim 1, wherein said particles of less than about 25 microns in size have an apparent density of from about 0.97 to about 2.44 grams per cubic centimeter.
9. The resin composition of claim 1, wherein particles of less than about 20 microns in size have an apparent density of from about 0.97 to about 2.44 grams per cubic centimeter, and do not exceed a concentration of about 800 parts per million by weight of the resin.
10. The resin composition of claim 1, wherein said oxygen-scavenging particles are pre-treated with one or more reaction-enhancing agents.
11. The resin composition of claim 1, wherein bottles produced from said resin have a Hunter haze value of about 10 % or less.
12. A resin composition comprising:
a film-forming polyester; and an effective amount of oxygen-scavenging iron particles, wherein the iron particles have a particle size distribution such that particles of less than about 25 microns in size are present, but_do not exceed abour 1250 parts per million by weight of the resin.
13. The resin composition of claim 12, wherein said polyester comprises linear polyesters or branched polyesters.
14. The resin composition of claim 12, wherein said polyester comprises polyethylene terephthalate, copolymers of polyethylene terephthalate, polyethylene naphthalate, copolymers of polyethylene naphthalate, polybutylene terephthalate, copolymers of polybutylene terephthalate, polytrimethylene terephthalate, or copolymers of polytrimethylene terephthalate.
15. The resin composition of claim 12, wherein said effective amount of iron particles is from about 50 to about 2500 parts per million by weight of the resin.
16. The resin composition of claim 12, wherein said iron particles have a particle size range of about 20 to about 70 microns.
17. The resin composition of claim 12, wherein particles of less than about 20 microns in size do not exceed about 800 parts per million by weight of the resin.
18. The resin composition of claim 12, wherein said oxygen-scavenging particles are pre-treated with one or more reaction-enhancing agents.
19. The resin composition of claim 12, wherein bottles produced from said resin have a Hunter haze value of about 10 %.
20. A resin composition comprising a film-forming polyester and from about 50 to about 2500 parts by weight, of oxygen-scavenging iron particles per million, parts by weight of the resin, wherein the concentration of iron particles of less than about 25 microns in size does not exceed about 1250 parts per million by weight of the resin.
21.. The resin composition of claim 20, wherein said polyester comprises linear polyesters or branched polyesters.
22. The resin composition of claim 20, wherein said pol~rester comprises polyethylene terephthalate, copolymers of polyethylene terephthalate, polyethylene naphthalate, copolymers of polyethylene naphthalate, polybutylene terephthalate, copolymers of polybutylene terephthalate, polytrimethylene terephthalate, or copolymers of polytrimethylene terephthalate.
23. The resin composition of claim. 20, wherein said iron particles have a particle size range of from about 20 to about 70 microns.
24. The resin composition of claian 20, wherein particles of less than about microns in size do not exceed about 500 parts per million by weight of the resin,
25. The resin composition of claim 20, wherein said oxygen-scavenging particles are pre-treated with one or more reaction-enhancing agents.
26, The resin comppsition of claim 20, wherein bottles produced from said resin have a Hunter haze value of about 10 % or less when stretched to a thickness of from about 11 to about 16 mils.
27. A polyester resin composition fox use in forming transparent articles having low haze, the resin composition comprising from about SO to about 2500 parts by weight of iron particles per million by weight of the resin, wherein said transparent articles have a Hunter haze value of about 10% or less.
28. The resin composition of claim 27, wherein said polyester comprises polyethylene terephthalate, copolyrners of polyethylene terephthalate, polyethylene naphthalaze, copolymers of polyethylene naphthalare, polybutylene terephthalate, copolymers of polybutylene terephthalate, polytrimethylene terephthalate, or copolymers of polytrimethylene terephthalate.
29. The resin composition of claim 27, wherein said iron particles have a particle size distribution such that pazticles of less than about 25 microns in size do not exceed a concentration defined by the formula ppm=512.3 x d wherein ppm is the approximate concentration of particles of less than about 25 microns in size in parts per million by weight, and d is the apparent density of the particles of less than about 25 microns in size in grams per cubic centimeter.
30. An article formed from a resin, cornposirion comprising an effective amount of oxygen-scavenging particles, wherein the Hunter hate value of the article is about 10 % or less.
31. The article of claim 30, wherein sand article is a bottle.
32. The article of claim 30, wherein said resin composition comprises polyethylene terephthalate, copolymers of polyethylene terephthalate, polyethylene naphthalate, copolymers of polyethylene naphrhalate, polybutylene terephthalare, copolymers of polyburylene terephthaiare, polytrimethylene terephthalare, or copolymers of polytrimethylene terephthalate.
33. The article of .claim 30, wherein said hunter haze value of said article is about 8 % or less.
34. A method for incorporating high levels of oxygen-scavenging particles into a film-forming polyester resin composition with low haze comprising the steps of:
providing an effective amount of oxygen-scavenging particles comprising at least one oxygen-scavenging element capable of reacting with molecular oxygen, wherein the particles have a particle size distribution such that particles of less than about 25 microns in size are present, but do not exceed a concentation defined by the formula ppmT512.3 x d wherein ppm is the approximate concentration of particles of less than about 25 microns in size in parts per million by weight, and d is the apparent density of the particles of less than about 25 microns in size in grams per cubic centimeter;
adding said oxygen-scavenging particles to a polyester resin composition during one ox more of the process steps of melt phase polyrnexization of the polyester;
post polymerization and prior to pelletization;
solid state polymerization of the polyester; and exrtrusion.
35. The method of claim 34, wherein said step of adding oxygen-scavenging particles to a polyester resin composition produces a masterbatch of oxygen-scavenging resin; and wherein said method further comprises the step of adding said masterbarch to additional resin.
36. The method of claim 34 wherein said polyester resin comprises polyerhylene terephthalate copolmers of polyethylene terephthalate polyethylene naphthalate copolymers of polyethylene naphthalate, polybutylene terephthalate,copolymers of polybutylene terephrhalate, polytrimethylene terephthalate, or copolymers of polytrimethylene terephthalate
37. The method of claim 34, wherein said oxygen-scavenging particles comprise oxidizable forms of calcium, magnesium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, silver, zinc, tin, aluminum, antimony, germanium, silicon, lead, cadmium, rhodium, or combinations thereof.
38. The method of claim 34, wherein said oxygen-scavenging element comprises iron.
39. The method of claim 35, wherein said oxygen-scavenging element comprises iron.
40. The method of claim 34, wherein. said effective amount of oxygen-scavenging particles is from about 50 to about 2500 parts per million by weight of the resin.
41. The method of claim 34, wherein said particles of less than about 25 microns in size have an apparent density of from about 0.97 to about 2.44 grams per cubic centimeter
42. The method of claim 34, wherein particles of less than about 20 microns in size have an apparent density of from about 0.97 to about 2.44 grams per cubic centimeter, and do not exceed a concentration of about 800 parts per million by weight of the resin.
43. The method of claim 34, wherein said oxygen-scavenging particles are pre-treated with one or more reaction-enhancing agents.
44. The method of claim 34, wherein bottles produced from said resin have a Hunter haze value of about 10 % or less.
45 . A resin composition comprising:
a film-forming polyester; and particulates comprising oxygen-scavenging particles capable of reacting with molecular oxygen; wherein the parCiculates have a particle size distribution such that particles of less than, about 25 microns in site are present, but do not exceed a concentration defined by the formula ppm = 512.3 x d wherein ppm is the approximate concentration of particles of less than about 25 microns in size in parts per million by weight, and d is the apparent density of the particles of less than about 25 microns in size in grams per cubic centimeter.
46. A container having at least one wall, wherein the wall comprises a populated area, and wherein the populated area comprises:
a film-forming polymer; and a population of particles comprising an effective amount of oxygen-scavenging particles, wherein the number of particles of said population does not exceed a concentration of (6 x 10' particles = T) per cubic centimeter of polymer wherein T is the thiclmess of the populated area in mils; and wherein said wall has a transmission Hunter haze of up to about 1 percent per mil of the container wall.
47. The container of claim 46, wherein said polymer comprises polyester.
48. The container of claim 47, wherein said polyester comprises linear polyester.
49. The container of claim 48, wherein said polyester comprises polyethylene terephthalate, copolymers of polyethylene terephthalate, polyethylene naphthalate, copolymers of polyethylene naphzhalate, polybutylene terephthalate, copolymers of polybutylene terephthalate, polytrimethylene terephthalate, or copolymers of polytrimethylene terephthalate.
50. The container of claim 46, wherein the polyester is prepared from one or more polyfunctional comonomers.
51. The container of claim 50, wherein said polyfunctional comonomers are selected from the group consisting of pyromellitic dianhydride and pentaerythritol.
52. The container of claim 46, wherein said effective amount is at least about 50 parts per million by weight oxygen-scavenging particles per million pares by weight polymer.
53. The container of claim 46, wherein said oxygen-scavenging particles comprise at least one of calcium, magnesium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, silver, zinc, tin, aluminum, antimony, germanium, silicon, lead, cadmium, rhodium, or combinations thereof.
54. The container of claim 47, wherein said oxygen-scavenging particles comprise at least one of calcium, magnesium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, silver, zinc, tin, aluminum, antimony, germanium, silicon, lead, cadmium, rhodium, or combinations thereof.
55. The container of claim 48, wherein said oxygen-scavenging particles comprise at least one of calcium, magnesium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, silver, zinc, tin, aluminum, antimony, germanium, silicon, lead, cadmium, rhodium, or combinations thereof.
56. The container of claim 49, wherein said oxygen-scavenging particles comprise at least one of calcium, magnesium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, silver, zinc, tin, aluminum, antimony, germanium, silicon, lead, cadmium, rhodium, or combinations thereof.
57. The container of claim 46, wherein said oxygen-scavenging particles comprise iron.
58. The container of claim 47, wherein said oxygen-scavenging particles comprise iron.
59. The container of claim 48, wherein said oxygen-scavenging particles comprise iron.
60. The container of claim 49, wherein said oxygen-scavenging particles comprise iron.
61. The container of claim 46, wherein said oxygen-scavenging particles comprise iron, and wherein said oxygen-scavenging particles are present in an amount of from about 50 to about 12,000 parts per million by weight of the resin.
62. The container of claim 46, wherein said polymer further comprises one or more components selected from the group consisting of impact modifiers, surface lubricants, denesting agents, stabilizers, crystallization aids, antioxidants, ultraviolet light absorbing agents, catalyst deactivators, colorants, nucleating agents, acetaldehyde reducing agents, rehear reducing agents, fillers, branching agents, blowing agents, and accelerants.
63. The container of claim 46, wherein said population of particles further comprises reaction-enhancing particles.
64. The container of claim 63, wherein said reaction-enhancing particles comprise hydroscopic materials, electrolytic acidifying agents, non-electrolytic acidifying agents, metal halides, metal sulfates, metal bisulfates, or mixtures thereof.
65. The container of claim 46, wherein said oxygen-scavenging particles are pretreated with at least one reaction-enhancing agent.
66. The container of claim 46, wherein said container is a stretched bottle having a sidewall thickness of from about 11 to about 25 mils and a Hunter haze value of about 10 % or less.
67. The container of claim 47, wherein said container is a stretched bottle having a sidewall thickness of from about 11 to about 25 mils and a Hunter haze value of about 10 % or less.
68. The container of claim 48, wherein said container is a stretched bottle having a sidewall thickness of from about 11 to about 25 mils and a Hunter haze value of about 10 % or less.
69. The container of claim 49, wherein said container is a stretched bottle having a sidewall thickness of from about 11 to about 25 mils and a Hunter haze value of about 10% or less.
70. The container of claim 46, wherein said populated area comprises a laminated layer of the wall of the container.
71. The container of claim 46, wherein said populated area comprises a coextruded layer of the wall of the container.
72. The container of claim 46, wherein said thickness of said populated area is equal to the thickness of the container wall.
73. The container of claim 46, wherein the thickness of said populated area is less than the thickness of said container wall.
74. The container of claim 46, wherein said container is a tray.
75. A resin composition comprising:
a film-forming polyester; and an effective amount of oxygen-scavenging particles comprising at least one oxygen-scavenging element capable of reacting with molecular oxygen; wherein the particles have a particle size distribution such that particles within the size range of from about 25 to about 38 microns are present, and particles within the size range of from about 38 to about 45 microns are present, and wherein particles of less than about 25 microns in size do not exceed a concentration defined by the formula ppm = 512.3 × d wherein ppm is the approximate concentration of particles of less than about 25 microns in size in parts per million by weight, and d is the apparent density of the particles of less than about 25 microns in size in grams per cubic centimeter.
76. A resin composition comprising:
a film-forming polyester; and an effective amount of oxygen-scavenging particles comprising at least one oxygen-scavenging element capable of reacting with molecular oxygen; wherein the particles have a particle size distribution such that particles within the size range of from about 38 to about 45 microns are present, and particles within the size range of from about 45 to about 75 43a microns are present, and wherein particles of less than about 25 microns in size do not exceed a concentration defined by the formula ppm = 512.3 × d wherein ppm is the approximate concentration of particles of less than about 25 microns in size in parts per million by weight, and d is the apparent density of the particles of less than about 25 microns in size in grams per cubic centimeter.
77. A resin composition comprising:
a film-forming polyester; and an effective amount of oxygen-scavenging particles comprising at least one oxygen-scavenging element capable of reacting with molecular oxygen; wherein the particles have a particle size distribution such that particles within the size range of from, about 25 to about 38 microns are present, and particles within the size range of from about 38 to about 75 microns are present, and wherein particles of less than about 25 microns in size do not exceed a concentration defined by the formula ppm = 512.3 × d wherein ppm is the approximate concentration of particles of less than about 25 microns in size in parts per million by weight, and d is the apparent density of the particles of less than about 25 microns in size in grams per cubic centimeter.
78. A resin composition comprising:
a film-forming polyester; and an effective amount of oxygen-scavenging particles comprising at least one oxygen-scavenging element capable of reacting with molecular oxygen; wherein the particles have a particle size distribution such that particles within the size range of from about 25 to about 45 microns are present, and particles within the size range of from about 45 to about 75 microns are present, and wherein particles of less than about 25 microns in size do not exceed a concentration defined by the formula 43b ppm = 512.3 × d wherein ppm is the approximate concentration of particles of less than about 25 microns in size in parts per million by weight, anal d is the apparent density of the particles of less than about 25 microns in size in grams per cubic centimeter.
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US09/916,671 US6780916B2 (en) 2001-07-26 2001-07-26 Oxygen-scavenging resin compositions having low haze
US10/195,385 US7687124B2 (en) 2001-07-26 2002-07-16 Oxygen-scavenging containers having low haze
US10/195,385 2002-07-16
PCT/US2002/023824 WO2003010225A1 (en) 2001-07-26 2002-07-25 Oxygen-scavenging resin compositions and containers having low haze and related methods

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