WO2011112410A2 - Laminated and thermoformed articles containing oxygen scavenger - Google Patents
Laminated and thermoformed articles containing oxygen scavenger Download PDFInfo
- Publication number
- WO2011112410A2 WO2011112410A2 PCT/US2011/026972 US2011026972W WO2011112410A2 WO 2011112410 A2 WO2011112410 A2 WO 2011112410A2 US 2011026972 W US2011026972 W US 2011026972W WO 2011112410 A2 WO2011112410 A2 WO 2011112410A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- oxygen
- oxygen scavenging
- container
- iron
- Prior art date
Links
- 229940123973 Oxygen scavenger Drugs 0.000 title claims description 27
- 239000001301 oxygen Substances 0.000 claims abstract description 85
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 85
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 84
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 62
- 230000002000 scavenging effect Effects 0.000 claims abstract description 54
- 229910052742 iron Inorganic materials 0.000 claims abstract description 28
- 239000002245 particle Substances 0.000 claims abstract description 25
- 229920000642 polymer Polymers 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 18
- 150000001875 compounds Chemical class 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 12
- 238000001125 extrusion Methods 0.000 claims abstract description 11
- 239000008188 pellet Substances 0.000 claims abstract description 10
- 239000011159 matrix material Substances 0.000 claims abstract description 8
- 230000003213 activating effect Effects 0.000 claims abstract description 7
- 150000003839 salts Chemical class 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- 239000004094 surface-active agent Substances 0.000 claims abstract description 6
- 239000010410 layer Substances 0.000 claims description 62
- 235000013305 food Nutrition 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 17
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- -1 polypropylene Polymers 0.000 claims description 13
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- 229920001155 polypropylene Polymers 0.000 claims description 4
- BXOUVIIITJXIKB-UHFFFAOYSA-N ethene;styrene Chemical group C=C.C=CC1=CC=CC=C1 BXOUVIIITJXIKB-UHFFFAOYSA-N 0.000 claims description 3
- 229920001038 ethylene copolymer Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 3
- 239000011111 cardboard Substances 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims description 2
- 239000006096 absorbing agent Substances 0.000 claims 1
- RZXDTJIXPSCHCI-UHFFFAOYSA-N hexa-1,5-diene-2,5-diol Chemical compound OC(=C)CCC(O)=C RZXDTJIXPSCHCI-UHFFFAOYSA-N 0.000 claims 1
- 229920005989 resin Polymers 0.000 abstract description 12
- 239000011347 resin Substances 0.000 abstract description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 abstract description 8
- 239000002952 polymeric resin Substances 0.000 abstract description 5
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- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 abstract description 3
- 229910000342 sodium bisulfate Inorganic materials 0.000 abstract description 3
- 230000004913 activation Effects 0.000 abstract description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract description 2
- 150000001342 alkaline earth metals Chemical class 0.000 abstract description 2
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- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
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- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B4/00—General methods for preserving meat, sausages, fish or fish products
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- B65D81/267—Adaptations 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 the absorber being in sheet form
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J9/0066—Use of inorganic compounding ingredients
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7244—Oxygen barrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2325/02—Homopolymers or copolymers of hydrocarbons
- C08J2325/04—Homopolymers or copolymers of styrene
- C08J2325/06—Polystyrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0856—Iron
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Definitions
- This invention relates to surfactants useful for treating the resin pellets or coated iron powders in order to maximize dispersion that include lubricants such as mineral oil, fatty acids such as stearic acid, and low molecular weight compounds such as waxes, lidding films made from such materials and containers especially containers for food products made with such films.
- lubricants such as mineral oil, fatty acids such as stearic acid, and low molecular weight compounds such as waxes
- lidding films made from such materials and containers especially containers for food products made with such films.
- This invention also relates to articles that consist of laminated films that contain oxygen scavenger, articles that are
- Rigid food containers such as meat trays and disposable cups are used broadly in food packaging and food services application.
- Another conventional material for making trays or containers are solid sheets that consist of single or multilayer structures. Oxygen barrier materials such as EVOH are often used.
- a desirable feature of the containers is to maintain the freshness of the food.
- a common method to improve the freshness of a meat package is to remove the excess liquid by using soaking pads.
- a more effective method is to reduce the oxygen contents inside the package.
- Lidding film provides clarity, good seal to containers, strength and protection. Lidding film needs to be hand- peelable. It is desirable to have lidding film to possess oxygen scavenging capability to help the food freshness.
- a still further object of this invention is to provide laminated structures that contain oxygen scavenger and are useful as lidding films.
- thermoformable articles and peelable lidding films The overall advantages of incorporating a layer or layers of active or oxygen scavengers in the thermoformable articles and peelable lidding films include integrating oxygen scavenger into food packaging or container, effective oxygen scavenging without visible packet or sachet, flexible to add to areas that need oxygen scavenging, packaging
- US 6,821 ,594 B2 (to Mitsubishi Gas Chemical Co.) describes an oxygen absorbing label method with a protruding structure.
- US 6, 559,205 B2 and 7,056, 565 Bl (to Chevron Phillips Co.) describes organic-based, branched and pendant cyclic olefinic oxygen scavengers for multilayer containers.
- the methods include extruding fine oxygen scavenging particles (such as those described in US Pat. 6,899,822 , US Pat. applications 2005 /0205841 and 2007/020456, all to Multisorb Technologies Inc., incorporated in their entirety by reference) in a polymer matrix to form multilayer films.
- the films can be formed as part of the packaging materials or used as labels or as dividers within the package, or as a part of tray or another rigid support for the product within the package.
- the films can either be directly extruded with the packaging materials, or integrated with the packages by a post-extrusion processing step such as lamination, gluing or taping.
- the current invention is particularly focused on iron-based powders with a mean particle size of 1 - 25 urn, where iron particles are pre-coated with activating and oxidation reaction promoter particles to form a
- the films or sheets produced with the finely dispersed such oxygen scavenging particles advantageously possess high clarity and high reactivity with oxygen, compared to larger particles (poor clarity and reactivity) and smaller nanoscale particles (poor clarity).
- An object of this invention is to provide a well dispersed oxygen scavenging particulate compounded in a polymer matrix.
- the oxygen scavenging formulation consists of iron powder with a mean particle sizes within 1 - 25 urn and pre-coated with at least one or more activating and acidifying powdered compounds, usually in the form of solid organic and inorganic salts of alkaline and alkaline earth metals such as sodium chloride and sodium bisulfate.
- the pre-coated iron particulate is dispersed into a polymer resin by using a conventional melt processing method such as twin-screw extrusion.
- the oxygen scavenging compound is mixed with polymer pellets in the solid state prior to melting.
- the polymer resin pellets and the coated iron powder are preferably treated with a surfactant in the dry state to help dispersing the iron/salt powder with the resin pellets.
- the melt extruded compounds are pelletized and kept in the dry state to prevent premature activation.
- Another object of this invention is to provide a multilayer extruded film or sheet with the iron-containing compound extruded with a polymer.
- the film or sheet consists of three layers of the same base resin with the layer thickness ratios varying from 5/90/5 to 25 /50/25, and with the middle (active) layer comprising the iron based oxygen scavenger dispersed in a resin.
- the multilayer film can be unoriented (unstretched), uniaxially or biaxially stretched during or after the processing.
- the active layer thickness, location with the multilayer structure, and the fraction of oxygen scavenger particulate in it are fine tuned to provide the desired functionality (such as the rate of oxygen absorption, the duration of active barrier protection and transient barrier improvement, or their
- Another object of this invention is to provide a product- shaped article from the extruded film or sheet through die cutting, pouch making, bag making, lamination, thermoforming or other converting processes.
- the article may be in the form of adhered or inserted label or as part of the pouch film to fit the product requirements.
- the oxygen scavenging films are laminated, taped, bonded onto one of the inner surfaces of a pouch, or simply stored as an insert in a pouch.
- extruded film or sheet is graphically decorated such that it is compatible with the graphic design of the pouch.
- these materials could be placed on a surface of a rigid container or as lidding stock.
- Another object of this invention is to provide a printed or coated object that contains well dispersed oxygen scavengers
- the object may be a polymer or metallic substrate with the oxygen scavenging compounds printed or coated onto it.
- the iron based oxygen scavenger in the polymer matrix can be extrusion coated or solution printed on a polymer film prior to forming a pouch, bag, or a flexible enclosure for food packages, and in particular, the printed or coated pattern is a part of the graphic design of the package.
- Another object of this invention is to provide films or sheets that consist of at least a layer of active film laminated on a substrate.
- the active film contains oxygen scavenger, electrolytes and optionally other moisture absorbing additives such as silica gel, activated carbon and other sorbents.
- Figure-1 shows examples of (a) a two layer structure; and (b) a three layer structure of a sheet laminated with active film(s).
- Another object of this invention is to provide articles that are thermoformed from the laminated films or sheets for food packaging applications.
- the oxygen scavenging film is preferably located near the food side of the article.
- Figure-2 shows an example.
- Another object of this invention is to provide paper or cardboards that are laminated with at least a layer of oxygen scavenging film. The laminates are then converted or folded to form boxes or packages for liquid packaging or moist food packaging.
- Another object of this invention is to provide paper or plastic films that are laminated with a least a layer of oxygen scavenging film.
- the laminates are used as peelable lidding film for containers or packages.
- the lidding is attached to the container through heat seal or coating seal.
- Another object of this invention is to provide a method of making oxygen scavenging articles for food packaging.
- the method is to laminate oxygen scavenging films to a plastic and paper substrate prior to converting the laminates into food packaging articles.
- FIG. 1 Oxygen absorption property of FreshBlend nylon films DETAILED DESCRIPTION OF THE INVENTION
- FIG. 2 is a cross-section of a container made with a film in accordance with this invention.
- Fig. 3 is a cross-sectional view of an oxygen scavenging film on a carrier sheet.
- Fig. 4 is a cross-sectional view of a substrate having oxygen scavenging films on both surfaces thereof.
- Fig. 5 is a cross-sectional view of a thermoformed tray laminated with an oxygen scavenging film.
- Fig. 6 is a diagrammatic view of a laminator for making a tray in accordance with the invention
- Fig. 7 is a perspective view of two trays made in accordance with the invention.
- [0036] 8 is a perspective view of two trays made in accordance with the invention.
- This invention relates to methods of extruding oxygen scavenging polymer films that contain finely dispersed oxygen scavenging particulates.
- the oxygen scavenging film possesses high clarity and tunable oxygen absorption rate.
- This invention also relates to methods of using such oxygen scavenging films in construction of plastic pouches, bags, flexible enclosures and containers to preserve the freshness of foods and other consumer goods enclosed in the package through absorption of headspace oxygen and/or proving an active barrier to oxygen permeation.
- Flexible food packaging materials such as used in a plastic pouch usually require good oxygen barrier properties in order to prevent microbial growth and preserve the freshness of the food.
- This need can be exemplified by packages such as that for beef jerky, sausages, processed meats, etc.
- a sachet pack containing oxygen scavenger is commonly used in food pouches to absorb the head space oxygen and to absorb oxygen ingressed through the package wall. Sachets have been used for years in ready-to-serve food packages.
- sachet pack containing oxygen scavenger is commonly used in food pouches to absorb the head space oxygen and to absorb oxygen ingressed through the package wall.
- Sachets have been used for years in ready-to-serve food packages.
- there are potential disadvantages and limitations associated with the use of sachet This includes the following:
- Sachets can not be used for packaging liquid products that require oxygen scavenging.
- scavenging particles incorporated into a resin are within 1 - 25 urn in size, and most preferably within 2 - 5 urn in size. Such particles are small enough to be invisible to the naked human eye and at the same time large enough to minimize light scattering by particles of the size comparable to the visible light wavelengths (0.4 - 0.8 urn). The result is a reduced haze of a plastic article into which such particles are incorporated.
- the surfactants useful for treating the resin pellets or coated iron powders in order to maximize dispersion include lubricants such as mineral oil, fatty acids such as stearic acid, and low molecular weight compounds such as waxes.
- the reduced iron powder preferably has 1 -25 um mean particle size, more preferably 1 -1 0 um mean and most preferably 2-5 um mean.
- the combination and relative fraction of activating and acidifying components coated onto the iron particles are selected according to the teachings of US Pat. 6,899,822, US Pat. applications 2005/0205841 and 2007/020456, incorporated herein by reference.
- the coating technique is preferably a dry coating as described in the references above.
- the film structure is preferably 3 layer or more with the layer ratio in the range of 25 /50/25 and 1 /98/ 1 , with an optimum ratio depending on the design target (such as the rate of headspace oxygen absorption) with an example ratio being 1 5 /70/ 1 5.
- the coated iron is preferably located in the middle of the three layers.
- Films to be used as labels, laminates, lidding films, or inserts for a tray may consist of single or mu ltilayer structure with the coated iron uniformly distributed in the film or in the chosen layer(s).
- the coated iron is preferably located in the middle of the structure. It can be located adjacent to the external layer to facilitate absorption.
- the coated iron may be formulated in common extrusion coating polymers such as LDPE, EVA, EAA, PP, PS, waxes, emulsions, etc.
- Example 1 Extruded nylon films containing oxygen scavenger
- An oxygen scavenger package was prepared by coating iron particulates, 4- 5 urn mean particle size, with sodium bisulfate and sodium chloride to form a homogeneous coated composite powder.
- this composite powder abbreviated as "FreshBlend ® " oxygen scavenger sold by Multisorb Technologies, Inc. of Buffalo, NY, was used for extruding with a nylon 6 resin (Custom Resins Nylene 341 1 ).
- a Coperion twin screw extruder compounding equipment was used for compou nding FreshBlend with the resin.
- a metering feeder was used for precise feeding FreshBlend powder with the polymer resin prior to melting.
- the resin pellets were mixed with 0.2 wt% mineral oil (retail pharmacy grade) prior to feeding to the extruder.
- the extruder was set at 250C for all the heating zones and a die temperature at 260C.
- the FreshBlend was fed at a rate comparable to the extrusion rate to result in weight ratio in the range of 5 /95 to 20/80.
- the extruded strands were air cooled, or optionally water cooled prior to pelletizing.
- Example 2 Extrusion of oxygen scavenging films
- the films had a layer ratio of approximately 1 5/70/ 1 5 for materials of nylon / FreshBlend nylon blend / nylon for the respective layers.
- the net oxygen scavenger content was in the range of 1 to 3 wt% through let-down of the oxygen scavenging compounds.
- O2/N2 20/80 into the pouch.
- the oxygen concentration was measured periodically by using a Mocon model 450 head space analyzer.
- the oxygen absorption property is shown in Fig- 1 . It can be seen that the oxygen concentration decreased gradually with time and with the 2 wt% film decreased at a higher rate than the 1 wt% film. This example demonstrated the utility of the oxygen scavenging film in an enclosure such as a pouch.
- Fig. 3 is a cross-sectional view of a container such as a container for a food product made in accordance with this invention.
- a tray 1 0 is sealed by a multilayer lidding material.
- the top layer 20 is a low to medium permeability structural layer for supporting the other layers.
- layer 20 is at least somewhat impermeable to oxygen.
- Layer 1 8 is a polyester layer on which package printing may appear.
- layer 20 is sufficiently transparent so that the printing on layer 1 8 is clearly visible.
- Layer 1 6 is an optional foil layer that is substantially impermeable to oxygen. When layer 1 6 is used the oxygen permeability of the structural layer 20 may be less.
- Layer 1 4 is oxygen absorbing layer as described herein and layer 1 2 is an adhesive peel layer that has high adhesion but is nonetheless peelable from the upper lip of the tray 1 0 for example by pulling a corner thereof and peeling the multilayer structure away from the tray.
- layer 1 2 adheres at least as tenaciously or more
- the structural layer 20 may be formed from any suitable material such as Poly Butylene, polyethylene, linear low density
- the tray 1 0 may be formed from high density polyethylene, polystyrene or similar materials and may be foamed or semi rigid.
- the reduced iron powder preferably has 1 -25 um mean particle size, more preferably 1 -1 0 um mean and most preferably 2-5 um mean.
- the combination and relative fraction of activating and acidifying components coated onto the iron particles are selected according to the teachings of US Pat. 6,899,822, US Patent applications 2005 /0205841 and 2007/020456, incorporated herein for reference.
- the coating technique is preferably a dry coating as described in the references above.
- the main polymer for foam is polystyrene and styrene-butadiene copolymers.
- Other polymers included styrene-ethylene copolymer, polypropylene, polyethylene, polyurethane and their
- the main polymer disclosed in the invention is polylactic acid and its copolymers or derivatives.
- a preferred derivative is branched PLA or lightly cross-linked PLA.
- Other biodegradable polymers included polyhydroxyalkanoates (PHA) aliphatic co-polyesters, and its common type polymer of polyhydroxybutyrate (PHB), polycaprolactone, thermoplastic starches (TPS), cellulose and other polysaccharides. All can have their crystallinity varied to a broad range to result in various physical properties.
- the substrate can be single layer or multilayer structure. Examples of substrate structures are 5 layer coextruded sheet such as PE/tie/EVOH/tie/ PE or PP/tie/EVOH /tie/ PS and the like. "Tie” indicates an adhesive layer that ties two other materials.
- the substrate can be a 3 layer structure such as (PE+tie)/ EVOH /(PE+tie),
- nylon/EVOH /nylon and the like can be a single layer sheet such as PP, PLA, etc produced by extrusion.
- the foam su bstrate can be made of any known foaming agent such as butane, pentane, CO2 and moisture. Examples of foam structure are that of conventional polystyrene foam tray material that has density of 2-5 I b / f 13 and a thickness of 50 mil.
- the material can be PLA with branching agents or chain extenders.
- the oxygen scavenging film is preferably Freshblend films made by following US patent application #: 1 2 /41 6685, filed 4/ 1 /09.
- the film was extruded from a mixture of 1 7/3/80 ratio of iron, sodium chloride and low density polyethylene.
- the film can be a single or multilayer structure by itself with oxygen scavenger located in any layer of the film structure.
- Film materials can be polyolefins such as PE, PP, polystyrene, PLA and other common polymers.
- the Freshblend content can range from 0.5 to 50 wt%, preferably 1 to 1 0 wt% depending on the needs. Additionally, the deposit of the Freshblend can be patterned in stripes or specific deposits within the Freshblend films in such a way as to provide areas of complete transparency; especially useful in cases wherein the viewing of the product is paramount.
- Lamination can be done by using any batch or continuous lamination processing equipments.
- the lamination time and temperature can be set by following the favorable conditions to achieve the optimum bonding.
- a ready-made active film may be continuously laminated onto a sheet that is being extruded.
- Film can also be laminated onto a sheet unwinding from roll stocks.
- an adhesive layer is used to enhance the bonding between the active film and the substrates.
- the adhesive layer can include maleic-anhydride modified polymers, EVA, EAA, EMA polymer or
- a Freshblend film was made by coextruding a 3 layer structure consisting of LDPE/(PP+PE+ Freshblend) /LDPE to make 3.5 mil film.
- the Freshblend loading is approximately 6 wt% and is uniformly distributed in the middle layer of the film only.
- a 50 mil polystyrene foam sheet with a density of approximately 3 I b / f 13 was obtained from a commercial source.
- the film was laminated at approximately 90C onto the foam with the using of Dow IntegralTM 801 adhesive film between the FB film and foam sheet to form a 3 layer laminated structure as shown below:
- the laminated sheet was then thermoformed in a single cavity thermoformer to form a 5"x4"xl " tray as shown in Figure-6 for two identical samples.
- Figure 7 shows containers thermoformed from Freshblend film laminated polystyrene foam sheets as in the following example.
- Example 2 Thermoformed polystyrene container containing FreshBlend (FB) film
- the FB film was laminated onto 30 mil high impact polystyrene sheet using the same adhesive film and thermoformed onto 5"x4" x2"containers as shown in Figu re 7.
- the FB container on the right is compared with the nonFB container as shown to the left.
- Example 3 Thermoformed barrier containers containing Freshblend film
- FB film was laminated onto the following two barrier sheets produced by Spartech:
- Containers were made by using the same thermoforming method.
- Figure 7 shows containers thermoformed from Freshblend film laminated high impact polystyrene sheets
- Figure 8 shows cups thermoformed from Freshblend film laminated high impact polystyrene sheets
- a peelable lidding film as shown in Figure 2 can be made by laminating the following three materials: [0081 ] Layer 1 : Printed or reverse printed substrate - Polyolefin, PET, paper
- Layer 2 Freshblend film - single or multilayer containing
- Layer 3 Optional sealant layer - LDPE or acrylic based
- the three layer or more materials can be heat or coating laminated to form a single entity in the range of 1 to 40 mil, preferably 2 to 1 0 mil.
- the laminate is then used as peelable lidding film for cups, trays, bowls and other containers for food packaging.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Polymers & Plastics (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Organic Chemistry (AREA)
- Food Science & Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Packages (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Wrappers (AREA)
- Gas Separation By Absorption (AREA)
- Meat, Egg Or Seafood Products (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2011224679A AU2011224679A1 (en) | 2010-03-08 | 2011-03-03 | Laminated and thermoformed articles containing oxygen scavenger |
CA2799173A CA2799173A1 (en) | 2010-03-08 | 2011-03-03 | Laminated and thermoformed articles containing oxygen scavenger |
CN2011800249358A CN103003065A (en) | 2010-03-08 | 2011-03-03 | Laminated and thermoformed articles containing oxygen scavenger |
MX2012013913A MX2012013913A (en) | 2011-03-03 | 2011-03-03 | Laminated and thermoformed articles containing oxygen scavenger. |
EP20110753822 EP2569155A4 (en) | 2010-03-08 | 2011-03-03 | Laminated and thermoformed articles containing oxygen scavenger |
IL223133A IL223133A0 (en) | 2010-05-11 | 2012-11-19 | Laminated and thermoformed articles containing oxygen scavenger |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US12/719,160 US20110217430A1 (en) | 2010-03-08 | 2010-03-08 | Thermoplastic and biodegradable polymer foams containing oxygen scavenger |
US12/719,160 | 2010-03-08 |
Publications (2)
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WO2011112410A2 true WO2011112410A2 (en) | 2011-09-15 |
WO2011112410A3 WO2011112410A3 (en) | 2012-01-12 |
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PCT/US2011/024430 WO2011112304A2 (en) | 2010-03-08 | 2011-02-11 | Thermoplastic and biodegradable polymer foams containing oxygen scavenger |
PCT/US2011/026972 WO2011112410A2 (en) | 2010-03-08 | 2011-03-03 | Laminated and thermoformed articles containing oxygen scavenger |
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Application Number | Title | Priority Date | Filing Date |
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PCT/US2011/024430 WO2011112304A2 (en) | 2010-03-08 | 2011-02-11 | Thermoplastic and biodegradable polymer foams containing oxygen scavenger |
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US (1) | US20110217430A1 (en) |
EP (2) | EP2545112A4 (en) |
JP (1) | JP2013522390A (en) |
KR (1) | KR20130018752A (en) |
CN (2) | CN102869712A (en) |
AR (1) | AR080463A1 (en) |
AU (2) | AU2011224758A1 (en) |
BR (1) | BR112012022677A2 (en) |
CA (1) | CA2792150A1 (en) |
CL (1) | CL2012002491A1 (en) |
MX (1) | MX2012010417A (en) |
WO (2) | WO2011112304A2 (en) |
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- 2011-02-11 AU AU2011224758A patent/AU2011224758A1/en not_active Abandoned
- 2011-02-11 MX MX2012010417A patent/MX2012010417A/en not_active Application Discontinuation
- 2011-02-11 WO PCT/US2011/024430 patent/WO2011112304A2/en active Application Filing
- 2011-02-11 CA CA2792150A patent/CA2792150A1/en not_active Abandoned
- 2011-02-11 EP EP11753758.9A patent/EP2545112A4/en not_active Withdrawn
- 2011-02-11 JP JP2012557053A patent/JP2013522390A/en not_active Withdrawn
- 2011-02-11 KR KR20127026060A patent/KR20130018752A/en not_active Application Discontinuation
- 2011-02-11 BR BR112012022677A patent/BR112012022677A2/en not_active IP Right Cessation
- 2011-03-03 AU AU2011224679A patent/AU2011224679A1/en not_active Abandoned
- 2011-03-03 EP EP20110753822 patent/EP2569155A4/en not_active Withdrawn
- 2011-03-03 WO PCT/US2011/026972 patent/WO2011112410A2/en active Application Filing
- 2011-03-03 CN CN2011800249358A patent/CN103003065A/en active Pending
- 2011-03-04 AR ARP110100692 patent/AR080463A1/en not_active Application Discontinuation
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2012
- 2012-09-07 CL CL2012002491A patent/CL2012002491A1/en unknown
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3747952A4 (en) * | 2018-01-29 | 2021-11-03 | Toyo Seikan Co., Ltd. | Oxygen-absorbing resin composition and container |
Also Published As
Publication number | Publication date |
---|---|
CL2012002491A1 (en) | 2013-02-15 |
CA2792150A1 (en) | 2011-09-15 |
KR20130018752A (en) | 2013-02-25 |
AU2011224758A1 (en) | 2012-09-27 |
AU2011224679A1 (en) | 2013-05-02 |
JP2013522390A (en) | 2013-06-13 |
EP2545112A4 (en) | 2015-04-01 |
CN102869712A (en) | 2013-01-09 |
BR112012022677A2 (en) | 2016-08-30 |
US20110217430A1 (en) | 2011-09-08 |
EP2569155A2 (en) | 2013-03-20 |
EP2569155A4 (en) | 2015-04-01 |
WO2011112304A2 (en) | 2011-09-15 |
EP2545112A2 (en) | 2013-01-16 |
AR080463A1 (en) | 2012-04-11 |
MX2012010417A (en) | 2012-10-05 |
WO2011112410A3 (en) | 2012-01-12 |
CN103003065A (en) | 2013-03-27 |
WO2011112304A3 (en) | 2011-12-29 |
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