EP1753663A2 - Lidstock material having improved sealability and peelability to wide classes of materials - Google Patents
Lidstock material having improved sealability and peelability to wide classes of materialsInfo
- Publication number
- EP1753663A2 EP1753663A2 EP05760433A EP05760433A EP1753663A2 EP 1753663 A2 EP1753663 A2 EP 1753663A2 EP 05760433 A EP05760433 A EP 05760433A EP 05760433 A EP05760433 A EP 05760433A EP 1753663 A2 EP1753663 A2 EP 1753663A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- lidstock
- lid
- substrate
- film
- filler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 title claims abstract description 52
- 239000000758 substrate Substances 0.000 claims abstract description 25
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 229920001634 Copolyester Polymers 0.000 claims abstract description 11
- 229920000642 polymer Polymers 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011256 inorganic filler Substances 0.000 claims abstract description 8
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 8
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 7
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 3
- 229920003023 plastic Polymers 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 14
- 239000011888 foil Substances 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000005033 polyvinylidene chloride Substances 0.000 claims description 8
- 239000000454 talc Substances 0.000 claims description 8
- 229910052623 talc Inorganic materials 0.000 claims description 8
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 150000001735 carboxylic acids Chemical class 0.000 claims description 4
- 239000000123 paper Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- -1 polypropylene Polymers 0.000 description 14
- 239000004743 Polypropylene Substances 0.000 description 10
- 229920000139 polyethylene terephthalate Polymers 0.000 description 10
- 239000005020 polyethylene terephthalate Substances 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 229920001155 polypropylene Polymers 0.000 description 7
- 239000004698 Polyethylene Substances 0.000 description 6
- 239000004800 polyvinyl chloride Substances 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 5
- 229920000915 polyvinyl chloride Polymers 0.000 description 5
- 239000004793 Polystyrene Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- XDOFQFKRPWOURC-UHFFFAOYSA-N 16-methylheptadecanoic acid Chemical compound CC(C)CCCCCCCCCCCCCCC(O)=O XDOFQFKRPWOURC-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 229920000229 biodegradable polyester Polymers 0.000 description 2
- 239000004622 biodegradable polyester Substances 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 229940093470 ethylene Drugs 0.000 description 2
- 229920001519 homopolymer Polymers 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000002991 molded plastic Substances 0.000 description 2
- 229920001748 polybutylene Polymers 0.000 description 2
- 229920000307 polymer substrate Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 235000013618 yogurt Nutrition 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 101100123436 Schizosaccharomyces pombe (strain 972 / ATCC 24843) hap3 gene Proteins 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229920000704 biodegradable plastic Polymers 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 235000013351 cheese Nutrition 0.000 description 1
- 235000016213 coffee Nutrition 0.000 description 1
- 235000013353 coffee beverage Nutrition 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920002959 polymer blend Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 235000011962 puddings Nutrition 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000003441 saturated fatty acids Nutrition 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 235000015067 sauces Nutrition 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 150000004684 trihydrates Chemical class 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- 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
- B32B1/00—Layered products having a general shape other than plane
-
- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- 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
- B32B2435/00—Closures, end caps, stoppers
- B32B2435/02—Closures, end caps, stoppers for containers
-
- 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.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
Definitions
- the present invention relates to a lidstock material suitable for making lids to be sealed over plastic containers such as pharmaceutical blisters.
- Background of the Invention [0002] Many products are placed in containers covered by a lidstock material and such products can range from yogurt to disposable contact lenses. Such lidstocks must be sealable to a very wide class of materials, peelable and resistant to both hot and cold temperatures.
- Many pharmaceuticals and disposable contact lenses are packaged in blister packages consisting of 2 pieces: a base and a lid.
- the base is an injection molded plastic shaped to include a bowl-shaped or rectangular recess for receiving the contents.
- each blister pack generally contains a contact lens and enough solution to prevent drying and to maintain the contact lens ready for use.
- the lid covering the base is heat sealed over the recess containing the contents of the blister package.
- the lid must be easily peelable from the base in order to provide easy access without spilling the contents.
- the lid must be seal compatible with a wide variety of materials.
- Martinez U.S. 4,691,820 suggests a polypropylene base and cover of polypropylene film/aluminum foil laminate.
- Yamada in U.S. 5,061,532 suggests a thermoplastic rim and a lid made of the same material as the rim.
- Stevenson in U.S. 5,626,929 suggests a lidstock material containing a mixture of butene-1 and ethyl ene copolymer, an ethyl ene homopolymer or copolymer, an inorganic filler and optionally a propylene homopolymer or copolymer laminated to a metal or polymer substrate.
- the prior art lidstock materials generally suffer from one or more serious disadvantages making them less than entirely suitable for their intended purpose, including compatibility with an extensive class of substrate or blister package sealing lids, for example compatibility with polystyrene (“PS”), polypropylene (“PP”), polyethylene (“PE”) and with all three of polyvinyl chloride (“PVC”), polyethylene terephthalate (“PET”), and polyvinylidene chloride (“PVDC”).
- PS polystyrene
- PP polypropylene
- PE polyethylene
- PVDC polyvinylidene chloride
- polyester resins appear to be further described in U.S. Patent Specification Nos. 5,292,783; 5,446,079; and 6,342,304B1 (all Buchanan et al.) for possible use as fibers, molded objects and films.
- Mueller in U.S. Patent Specification No. 6,503, 549B1, teaches polyethylene terephthalate (PET) tray typed packages with lidding films directly sealable to the tray where the films include glycol-modified polyethylene terephthalate sealant layers.
- a principal objective of the present invention is to provide a lidstock material for lids having excellent burst strength, good cohesive peel properties, acceptable heat resistance and excellent compatibility with all of PVC, PET and PVDC, as well as with PS, PP and PE. [0009] Additional objectives and advantages of the present invention will become apparent from the following detailed description of some preferred embodiments.
- a peelable and heat sealable material suitable bonding to a wide variety of substrates comprising a solid substrate joined to a film comprising aliphatic-aromatic copolyester, parti culate inorganic filler, butene-1 polymer, and ethylene- vinyl acetate copolymer.
- the invention also consists essentially of and consists of such components.
- the copolyester can include a biodegradable component.
- the particle size of the filler is very important and ranges from 0.5 micrometer (micron) to 10.0 micrometer.
- the film contains from about 25 wt. % to about 50 wt.
- the substrate can be, for example, metal foil, plastic or paper but the preferred substrate is aluminum foil.
- the preferred range is from about 10 wt. % to about 30 wt. % of butene-1 polymer and about 10 wt. % to about 30 wt. % ethylene- vinyl acetate copolymer.
- composition/substrate provides excellent bonding sealing and cohesive peeling to all of PVC, PET and PVDC as well as more easily bondable packaging such as PS, PP and PE.
- Plastic and metal substrates are easily bonded to films of this material. These materials are particularly useful as a "peelable” “heat sealable” “lidstock material” for containers.
- the term “lidstock material” refers to a metal, polymer, or paper substrate laminated with a heat seal layer or film. Lidstock material of the present invention is made into container lids by cutting the material into desired shapes such as circles or rectangles.
- the term “heat sealable” refers to the ability to form a bond between a plastic container and its lid when heat and pressure are applied locally for a sufficient time. The bond is gas-tight and preferably has sufficient burst strength to resist separation of the lid from the container body, even when the sealed container is retorted at an elevated temperature.
- the term “peelable” refers to the ability of a sealed lid to separate and to release from sealed engagement with a container body while both the lid and the body substantially retain their integrity. Such separation and release are achieved by manually applying a separating force to an outer edge portion of the lid.
- the lidstock material of the invention preferably a substrate laminated with a film comprising a polymer mixture of this invention.
- the substrate can be an aluminum foil having a thickness of about 0.25 mil to 3.0 mils (0.00025 inch to 0.003 inch (6.35 to 76.2 micrometers)).
- Aluminum foil provides an excellent barrier against penetration of gases and moisture. Aluminum foil also protects the package contents from ultraviolet light and has an aesthetically pleasing appearance.
- a particularly preferred aluminum foil substrate has a thickness of about 2 mils (0.002 inch-50.8 micrometers).
- the substrate is preferably coated with a print primer.
- the print primer facilitates application of printed labeling on the substrate.
- a particularly preferred print primer has a coating weight of about 0.4 to 0.9 pound per 3000 square feet (0.6-1.4 g./sq meter).
- the peelable and heat sealable film has a total weight of about 17 lb per 3000 square feet (27 g/sq meter).
- the filler enhances peelablity of the coating by assisting the seal failure upon peeling from adhesive failure at the container-coating layer interface to cohesive failure in the coating layer itself.
- the filler preferably is selected from at least one of talc, silica or alumina and comprises at least about 15 wt. % of the coating, preferably about 15 wt. % to 30 wt. %, more preferably about 20 wt. % to 30 wt. %.
- the filler is preferably a powder having an average particle size of about 0.5-10 micrometers (microns). Talc having an average particle size of about 12 0.5 to 10 micrometers is particularly preferred.
- the talc or other filler is preferably provided with a surface coating comprising about 0.5 wt.
- a carboxylic acid surface coating is particularly preferred.
- the surface coating contributes to talc dispersion and adhesion within the polymer.
- the carboxylic acid in the surface coating may be a mono or dicarboxylic acid or a mixture of such acids.
- Some preferred acids include stearic acid and isostearic acid, which is a liquid mixture of mostly C 18 saturated fatty acids having the general formula C ⁇ 7 H 35 COOH. Other saturated C ⁇ o-C 2 n carboxylic acids or mixtures thereof may also be useful.
- a particularly preferred butene-1 polymer is sold by Basell Polyolefins under the Tradename "PB 1710 M' and has a density of 0.908; a melt flow rate of 1.0 min by ASTM D 1238; and a melting point of 241° F (116° C).
- Figure 1 is a top plan view of one embodiment of a container, here a blister pack, which might be made with the present invention
- Figure 2 is a side elevational view of the blister pack of Figure 1 with the lid partially peeled back
- Figure 3 is an enlarged fragmentary, cross-sectional view of the lid of the blister pack shown in Figure 2
- Figure 4 is a perspective view of a food container which might be made with the present invention.
- FIGS 1 and 2 there is shown one type of many varieties of containers that are useful with the lidstock material of this invention; a blister pack 10 made in accordance with the present invention, with a lid 12 partially peeled back to reveal its contents. While the present invention will be described with a blister pack this is in no way to be taken as limiting.
- the pack 10 comprises an injection molded plastic container body 14 heat sealed to the lid 12.
- the body 14 defines a bowl-shaped recess 16 having a diameter of about 2 cm. and a depth of about 0.5 cm.
- a flange 18 extending around the recess 16 includes a tapered curled lip 20 spaced apart from the recess 16.
- the recess 16 here houses a contact lens 22 and a saline solution 24.
- the recess 16 is circumscribed by a seal area 26 which is part of the flange 18.
- the lid 12 is preferably attached to the body 14 by heat sealing in the seal area 26. Other suitable means for attaching the lid 12 to the body 14 include induction sealing and sonic welding.
- the total interior volume defined by the recess 16 and the lid 12 is preferably less than 1 milliliter.
- the body 14 is preferably made from a plastic material which can be shaped by injection molding or thermoforming.
- the plastic material for the body is preferably polypropylene but may also be other plastic materials having similar properties, such as polyethylene, polyethylene- polypropylene mixtures, polyethylene-polypropylene copoiymers, polybutylene, polyesters (e.g. PET), polycarbonates, and other thermoplastics. Plastics having low vapor transmission rates are most preferred. Plastics such as PVC, PET and PVDC are also bondable with the lidstock material of this invention. [0025] Referring now to Figure 3, the lid 12 is made from lidstock material comprising substrate 30, preferably aluminum foil, having a polyurethane adhesive layer 31 joining a film 32 to the substrate 30. An exterior side of the substrate 30 displays graphic matter (not shown) printed over a print primer 33.
- the substrate 30 has a thickness of about 2 mils. (0.002 inch-50.8 micrometers).
- the print primer 33 has a weight of about 0.4 to 0.9 pounds per 3000 square feet.
- the film 32 has a thickness of about 25 micrometers (1 mil.), corresponding to a weight of about 17 pounds per 3000 square feet.
- the lid 12 includes only a single layer of the film 32.
- Figure 4 shows another type container that might use the lidstock material of this invention.
- the container 40 has a cavity 42 within the body for containing food such as prepared cake, frosting, pudding, yogurt, cream cheese, or apple sauce, juice, coffee and the like with a lip/flange 44 extending radially outward from the body 46 and a lid 12 made from lidstock material having the same configuration as Figure 3.
- the preferred blister pack 10 shown in Figures 1 to 3 has a lid 12 heat sealed to an injection molded polypropylene body 14.
- the film 32 on the lid 12 may have the compositions as follows:
- the copolyester is a mixture of aliphatic-aromatic copolyester and a biodegradable component selected from the group consisting of cellulose, cellulose monoacetate, starch and mixtures thereof making up from 0.5 wt. % to 10 wt. %, based on the weight of the copolyester.
- the preferred range of copolyester is from about 20 wt. % to 40 wt. %.
- the inorganic filler is selected from the group consisting of talc, silica, alumina, alumina trihydrate, and mixtures thereof.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/866,541 US20050276940A1 (en) | 2004-06-10 | 2004-06-10 | Lidstock material having improved sealability and peelability to wide classes of materials |
PCT/US2005/020376 WO2005123515A2 (en) | 2004-06-10 | 2005-06-09 | Lidstock material having improved sealability and peelability to wide classes of materials |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1753663A2 true EP1753663A2 (en) | 2007-02-21 |
Family
ID=35460881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05760433A Withdrawn EP1753663A2 (en) | 2004-06-10 | 2005-06-09 | Lidstock material having improved sealability and peelability to wide classes of materials |
Country Status (3)
Country | Link |
---|---|
US (1) | US20050276940A1 (en) |
EP (1) | EP1753663A2 (en) |
WO (1) | WO2005123515A2 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8398306B2 (en) | 2005-11-07 | 2013-03-19 | Kraft Foods Global Brands Llc | Flexible package with internal, resealable closure feature |
US7871697B2 (en) * | 2006-11-21 | 2011-01-18 | Kraft Foods Global Brands Llc | Peelable composite thermoplastic sealants in packaging films |
US7871696B2 (en) * | 2006-11-21 | 2011-01-18 | Kraft Foods Global Brands Llc | Peelable composite thermoplastic sealants in packaging films |
US9232808B2 (en) | 2007-06-29 | 2016-01-12 | Kraft Foods Group Brands Llc | Processed cheese without emulsifying salts |
CA2716988A1 (en) * | 2008-02-28 | 2009-09-03 | Winpak Heat Seal Packaging Inc. | Extrusion-coated lidding foil for push-through blister packaging |
FR2942460A1 (en) * | 2009-02-26 | 2010-08-27 | Impress Group Bv | Metallic box i.e. can, for packaging food product, has peripheral wall including continuous section formed without weld and defined by ends, which are arranged with bottom elements |
NZ601823A (en) | 2010-02-26 | 2014-08-29 | Intercontinental Great Brands Llc | Package having an adhesive-based reclosable fastener and methods therefor |
RU2557614C2 (en) | 2010-02-26 | 2015-07-27 | Интерконтинентал Грейт Брэндс ЛЛС | Uv-curable self-adhesive material with low stickiness for re-sealed packages |
US9533472B2 (en) | 2011-01-03 | 2017-01-03 | Intercontinental Great Brands Llc | Peelable sealant containing thermoplastic composite blends for packaging applications |
FR3114576B1 (en) * | 2020-09-25 | 2022-10-07 | Oreal | Lid for closing a container with a heat-sealed peelable flexible film, and thus sealed container. |
WO2022260679A1 (en) | 2021-06-11 | 2022-12-15 | Amcor Flexibles North America, Inc. | Peelable and sealable lidstock material for containers |
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US4665130A (en) * | 1984-08-31 | 1987-05-12 | Shell Oil Company | Packaging film and sheet capable of forming peelable seals with good optics |
US4691820A (en) * | 1985-11-18 | 1987-09-08 | Vistakon, Inc. | Package for hydrophilic contact lens |
US4876156A (en) * | 1987-05-15 | 1989-10-24 | Shell Oil Company | Film and sheet capable of forming retortable and easy-open packagings |
US4916190A (en) * | 1987-05-15 | 1990-04-10 | Shell Oil Company | Film and sheet capable of forming retortable and easy-open packagings |
US4810541A (en) * | 1987-11-27 | 1989-03-07 | Continental Can Company, Inc. | Plastic container having a surface to which a lid may be peelably sealed |
US4886849A (en) * | 1988-02-29 | 1989-12-12 | Shell Oil Company | Butene-1 molding resin blends |
US5061532A (en) * | 1988-04-20 | 1991-10-29 | Idemitsu Petrochemical, Co., Ltd. | Multilayer structure and easily openable container and lid |
US5106917A (en) * | 1990-02-28 | 1992-04-21 | Shell Oil Company | Peelable lidstock based on polybutylene block copolymer blends |
US5066543A (en) * | 1990-02-28 | 1991-11-19 | Shell Oil Company | Film, sheet and laminate capable of forming easy-open packagings |
US5292783A (en) * | 1990-11-30 | 1994-03-08 | Eastman Kodak Company | Aliphatic-aromatic copolyesters and cellulose ester/polymer blends |
ES2278424T3 (en) * | 1990-11-30 | 2007-08-01 | Novamont S.P.A. | ALPHATICO-AROMATIC COPOLIESTERS. |
US5626929A (en) * | 1995-06-07 | 1997-05-06 | Aluminum Company Of America | Peelable and heat sealable lidstock material for plastic containers |
US5958531A (en) * | 1997-11-25 | 1999-09-28 | Aluminum Company Of America | Peelable and heat sealable lidstock material for steel end containers |
US6503549B1 (en) * | 1998-09-30 | 2003-01-07 | Cryovac, Inc. | Polyester tray package with lidding film having glycol-modified copolyester sealant layer |
JP3711815B2 (en) * | 1999-10-29 | 2005-11-02 | 東洋製罐株式会社 | Extruded laminate manufacturing method |
US6630237B2 (en) * | 2001-02-05 | 2003-10-07 | Cryovac, Inc. | Peelably sealed packaging |
-
2004
- 2004-06-10 US US10/866,541 patent/US20050276940A1/en not_active Abandoned
-
2005
- 2005-06-09 WO PCT/US2005/020376 patent/WO2005123515A2/en active Application Filing
- 2005-06-09 EP EP05760433A patent/EP1753663A2/en not_active Withdrawn
Non-Patent Citations (1)
Title |
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See references of WO2005123515A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005123515A3 (en) | 2006-11-09 |
WO2005123515A2 (en) | 2005-12-29 |
US20050276940A1 (en) | 2005-12-15 |
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