US4778715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inter-ply adhesion between saran and linear ethylene copolymers
Assignee: Cryovac LLC
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Filing: 1987-06-24
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Granted: 1988-10-18
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Expires: 2007-06-24
Abstract
Abstract Disclosed are multi-layer films having improved adhesion between layers. A film layer comprising vinylidene chloride copolymer is directly adhered to a film layer comprising a blend of ethylene/butyl-acrylate copolymer with linear ethylene/alpha-olefin copolymer.
Inventors
- 👤 Daniel J. Ferguson
- 👤 Steven B. Garland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:27
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/32; B32B38/00; B32B38/0012; B32B2038/0028; B32B2270/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1334; Y10T428/1341; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/24992; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31935; Y10T428/31938
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
56 words
A multi-layer film having improved adhesion between layers comprising: (a) a layer comprising vinylidene chloride copolymer; and, (b) a blended layer directly joined to the vinylidene chloride copolymer layer, said blended layer comprising about 5% to about 40% by weight of ethylene/butyl-acrylate copolymer blended with about 95% to about 60% by weight of linear ethylene/alpha-olefin copolymer.
Claim 2
Dependent Claim
56 words
A multi-layer film having improved adhesion between layers comprising: (a) a layer comprising vinylidene chloride copolymer; and, (b) a blended layer directly joined to the vinylidene chloride copolymer layer, said blended layer comprising about 5% to about 40% by weight of ethylene/butyl-acrylate copolymer blended with about 95% to about 60% by weight of linear ethylene/alpha-olefin copolymer.
Claim 3
Dependent Claim
19 words
The film of claim 1 wherein the linear ethylene/alpha-olefin copolymer has a density of less than about 0.920 gms/cc.
Claim 4
Dependent Claim
25 words
The film of claim 1 wherein the butyl acrylate content of the ethylene/butyl-acrylate is in the range of about 2% to about 6% by weight.
Claim 5
Dependent Claim
31 words
The film of claim 1 wherein the vinylidene chloride copolymer layer is joined to a layer comprising a thermoplastic material on its surface opposite the surface joining to the blended layer.
Claim 6
Dependent Claim
25 words
The film of claim 4 wherein the thermoplastic layer consists essentially of an ethylene/butyl-acrylate copolymer or blends of ethylene/butyl-acrylate copolymers with ethylene polymers or copolymers.
Claim 7
Dependent Claim
37 words
The film of claim 5 wherein the thermoplastic layer consists essentially of a blend of about 5% to about 40% by weight of ethylene/butyl-acrylate copolymer with about 95% to about 60% by weight of linear ethylene/alpha-olefin copolymer.
Claim 8
Dependent Claim
61 words
A multi-layer film having improved adhesion between layers comprising: (a) a layer comprising vinylidene chloride copolymer; and, (b) a blended layer directly joined to each side of the vinylidene chloride copolymer layer, each of said blended layers comprising about 5% to about 40% by weight of ethylene/butyl-acrylate copolymer blended with about 95% to about 60% by weight of linear ethylene/alpha-olefin copolymer.
Claim 9
Dependent Claim
61 words
A multi-layer film having improved adhesion between layers comprising: (a) a layer comprising vinylidene chloride copolymer; and, (b) a blended layer directly joined to each side of the vinylidene chloride copolymer layer, each of said blended layers comprising about 5% to about 40% by weight of ethylene/butyl-acrylate copolymer blended with about 95% to about 60% by weight of linear ethylene/alpha-olefin copolymer.
Claim 10
Dependent Claim
19 words
The film of claim 7 wherein the linear ethylene/alpha-olefin copolymer has a density of about 0.920 gms/cc or less.
Claim 11
Dependent Claim
25 words
The film of claim 7 wherein the butyl acrylate content of the ethylene/butyl-acrylate is in the range of about 2% to about 6% by weight.
Claim 12
Dependent Claim
17 words
The film of claim 7 wherein the vinylidene chloride copolymer layer has methyl acrylate as its comonomer.
Claim 13
Dependent Claim
87 words
A multi-layer film having improved adhesion between layers comprising: (a) a layer comprising vinylidene chloride copolymer; and, (b) a blend layer directly joined to each side of the vinylidene chloride layer, one said blend layer (I) being about 25% by weight ethylene/butyl-acrylate copolymer with about 75% by weight linear low density polyethylene having a density of about 0.920 and the other said blend layer (II) being about 25% by weight ethylene/butyl-acrylate copolymer with about 75% of a linear low density polyethylene having a density of about 0.912.
Claim 14
Dependent Claim
87 words
A multi-layer film having improved adhesion between layers comprising: (a) a layer comprising vinylidene chloride copolymer; and, (b) a blend layer directly joined to each side of the vinylidene chloride layer, one said blend layer (I) being about 25% by weight ethylene/butyl-acrylate copolymer with about 75% by weight linear low density polyethylene having a density of about 0.920 and the other said blend layer (II) being about 25% by weight ethylene/butyl-acrylate copolymer with about 75% of a linear low density polyethylene having a density of about 0.912.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |