US4937139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Peelable packaging and sheet materials and compositions for use therein
Assignee: Pechiney Plastic Packaging Inc
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Filing: 1987-04-30
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Granted: 1990-06-26
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Expires: 2007-04-30
Abstract
Abstract Compositions of matter, sheet material, and packages made therefrom. Novel compositions of polypropylene and high density polethylene are useful as sealant materials for flexible sheet material structures wherein the sheet material is sealable to a preformed container, to form a lid therefor, and is peelable therefrom, with cohesive failure of the sealant layer in the area of the formed seal. The novel sealant layer compositions provide for package closure and sealing which is capable of withstanding retort conditions while maintaining the integrity of the package closure and seal. Concurrently the lid is readily peeled from the package to provide access to the interior of the package. The peelability comprises cohesive failure of the sealant material in a novel blend of a polypropylene polymer with an ethylene polymer having a density of at least 0.940. The novel sealant materials of the invention can be used on a variety of multiple layer sheet material substructures, and particularly those providing barrier properties to food type packaging; especially barrier to the transmission of oxygen and moisture. Typical barrier materials are metal foil, vinylidene chloride copolymer, vinyl alcohol copolymer, olefin polymers and copolymers, and combinations of the above materials.
Inventors
- 👤 Roger P. Genske
- 👤 Frank Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:02
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/16; B29C48/18; B29C48/185; B32B27/30; B32B27/304; B32B27/306; B32B7/00; B32B7/04; B32B7/06; B32B7/12; B65; B65D; B65D77/00; B65D77/10; B65D77/20; B65D77/2024; B65D77/2028; B65D77/2032; B65D77/2044; B32B2307/00; B32B2307/70; B32B2307/748; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/10; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
82 words
A multiple layer sheet material, comprising, in order: (a) a first layer of a blend of 65% to 95% by weight of a propylene polymer, and 35% to 5% by weight of an ethylene polymer having a density of at least 0.940, said first layer having two surfaces; (b) a second layer of an adhesive promoting material; (c) a third layer of a barrier material selected from the group consisting of vinylidene chloride copolymer, vinyl alcohol copolymer, ethylene polymers and propylene polymers.
Claim 2
Dependent Claim
82 words
A multiple layer sheet material, comprising, in order: (a) a first layer of a blend of 65% to 95% by weight of a propylene polymer, and 35% to 5% by weight of an ethylene polymer having a density of at least 0.940, said first layer having two surfaces; (b) a second layer of an adhesive promoting material; (c) a third layer of a barrier material selected from the group consisting of vinylidene chloride copolymer, vinyl alcohol copolymer, ethylene polymers and propylene polymers.
Claim 3
Dependent Claim
22 words
A multiple layer sheet material as in claim 1 and including a layer of an adhesive between said first and second layers.
Claim 4
Dependent Claim
29 words
A multiple layer sheet material as in claim 1 and including a layer of a propylene polymer on one said surface of said first layer opposite said second layer.
Claim 5
Dependent Claim
29 words
A multiple layer sheet material as in claim 2 and including a layer of a propylene polymer on one said surface of said first layer opposite said second layer.
Claim 6
Dependent Claim
42 words
A multiple layer sheet material as in claim 1, 2, 3, or 4 wherein said second layer is a primer comprising a carboxy modified polyolefin, and including a fourth layer of adhesive joining said third layer to a fifth abuse resistant layer.
Claim 7
Dependent Claim
65 words
A multiple layer sheet material as in claim 1, 2, 3, or 4 wherein the composition of said second layer is selected from the group consisting of carboxy modified olefin polymers and catalyzed urethane adhesives, wherein said third layer is a vinylidene chloride copolymer, and including a fourth layer of an abuse resistant polymer on a surface of said third layer opposite said second layer.
Claim 8
Dependent Claim
52 words
A multiple layer sheet material as in claim 1, 2, 3, or 4 wherein said second layer is a carboxy-modified olefin polymer, wherein said third layer is a vinyl alcohol copolymer, and including a fourth layer of a carboxy-modified olefin polymer adhesive joining said third layer to a fifth abuse resistant layer.
Claim 9
Dependent Claim
74 words
A multiple layer sheet material as in claim 1, 2, 3, or 7 wherein said second layer is an adhesive, wherein said third layer is a vinyl alcohol copolymer, a fourth layer of an adhesive joining said third layer to a fifth abuse resistant layer, and including layers of amide polymer on either side of said third layer and interposed between said third layer and respective ones of said second and fourth adhesive layers.
Claim 10
Dependent Claim
60 words
A multiple layer sheet material as in claim 4, 5, 6, or 7 wherein said first layer comprises 65% to 75% by weight of said propylene polymer and 35% to 25% by weight of said ethylene polymer, said propylene polymer comprising a polymer of at least about 95 mole percent propylene and no more than about 5 mole percent ethylene.
Claim 11
Dependent Claim
53 words
A multiple layer sheet material as in claim 6 wherein said first layer comprises 65% to 75% by weight of said propylene polymer and 35% to 25% by weight of said ethylene polymer, said propylene polymer comprising at least about 95 mole percent propylene and no more than about 5 mole percent ethylene.
Claim 12
Dependent Claim
54 words
A multiple layer sheet material as in claim 7 wherein said first layer comprises 65% to 75% by weight of said propylene polymer and about 35% to 25% by weight of said ethylene polymer, said propylene polymer comprising at least about 95 mole percent propylene and no more than about 5 mole percent ethylene.
Claim 13
Dependent Claim
52 words
A multiple layer sheet material as in claim 8 wherein said first layer comprises 65% to 75% by weight of said propylene polymer and 35% to 25% by weight of said ethylene polymer, said propylene polymer comprising at least about 95 mole percent propylene and no more than about 5 percent ethylene.
Claim 14
Dependent Claim
44 words
A multiple layer sheet material as in claim 4, 5, 6, or 7 wherein said second layer comprises a urethane-based primer, wherein said third layer is a vinylidene chloride copolymer, and including a layer of propylene ethylene copolymer between said first and second layers.
Claim 15
Dependent Claim
33 words
A multiple layer sheet material as in claim 13 wherein said first layer comprises 65% to 95% by weight of said propylene polymer and 35% to 5% by weight of said ethylene polymer.
Claim 16
Dependent Claim
50 words
A multiple layer sheet material as in cliam 14 wherein said first layer comprises 65% to 75% by weight of said propylene polymer and 35% to 25% by weight of said polymer, said propylene polymer comprising at least 95 mole percent propylene and no more than 5 mole percent ethylene.
Claim 17
Dependent Claim
50 words
A multiple layer sheet material as in cliam 14 wherein said first layer comprises 65% to 75% by weight of said propylene polymer and 35% to 25% by weight of said polymer, said propylene polymer comprising at least 95 mole percent propylene and no more than 5 mole percent ethylene.
Claim 18
Dependent Claim
74 words
A multiple layer sheet material, comprising in order: (a) a first layer of a blend of 65% to 95% by weight of propylene polymer, and 35% to 5% by weight of an ethylene polymer having a density of at least 0.940, said first layer having two surfaces; (b) a second layer of an adhesive promoting material, said adhesive promoting material comprising a carboxy modified olefin polymer; and (c) a third layer of metal foil.
Claim 19
Dependent Claim
74 words
A multiple layer sheet material, comprising in order: (a) a first layer of a blend of 65% to 95% by weight of propylene polymer, and 35% to 5% by weight of an ethylene polymer having a density of at least 0.940, said first layer having two surfaces; (b) a second layer of an adhesive promoting material, said adhesive promoting material comprising a carboxy modified olefin polymer; and (c) a third layer of metal foil.
Claim 20
Dependent Claim
20 words
A sheet material as in claim 16 and including a layer of an adhesive between said first and second layers.
Claim 21
Dependent Claim
14 words
A sheet material as in claim 16 wherein said second layer comprises a primer.
Claim 22
Dependent Claim
27 words
A sheet material as in claim 17 and including a layer of a propylene polymer on one said surface of said first layer opposite said second layer.
Claim 23
Dependent Claim
43 words
A sheet material as in any one of claims 17, 18, or 19 wherein said second layer is a primer comprising a carboxy modified olefin polymer, and including a fourth layer of adhesive joining said third layer to a fifth abuse resistant layer.
Claim 24
Dependent Claim
32 words
A sheet material as in any one of claims 17, 18, or 19, and including a fourth layer of an adhesive joining said third foil layer to a fifth abuse resistant layer.
Claim 25
Dependent Claim
57 words
A sheet material as in any one of claims 17, 18, or 19 wherein said first layer comprises 85% to 95% by weight of said propylene polymer and 15% to 5% by weight of said ethylene polymer, said propylene polymer comprising a copolymer of 75 to 85 mole percent propylene and 25 to 15 mole percent ethylene.
Claim 26
Dependent Claim
51 words
A sheet material as in claim 20 wherein said first layer comprises 85% to 95% by weight of said propylene polymer and 15% to 5% by weight of said ethylene polymer, said propylene polymer comprising a copolymer of 75 to 95 mole percent propylene and 25 to 5 mole percent ethylene.
Claim 27
Dependent Claim
27 words
A multiple layer sheet material as in claim 23 wherein said propylene polymer comprises 75 to 85 mole percent propylene and 25 to 15 mole percent ethylene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |