US4588648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple layer plastic film having polypropylene adhered to nylon
Assignee: Rexam Beverage Can Co
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Filing: 1984-07-30
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Granted: 1986-05-13
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Expires: 2004-07-30
Abstract
Abstract A novel coextruded plastic film has, as an adhesive layer between polypropylene and nylon layers, a blend of polypropylene and a graft copolymer of maleic anhydride onto an olefin polymer or copolymer, the adhesive blend containing from about 0.005% to 0.75% maleic anhydride based on the total weight of the entire blend composition.
Inventors
- 👤 Duane A. Krueger
- 👤 Thomas W. Odorzynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:22
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
A multiple layer plastic film, comprising: (a) a layer of polypropylene; (b) a layer of nylon; and (c) a functionally adhesive layer juxtaposed between said nylon layer and said polypropylene layer, said adhesive layer being a blend consisting essentially of (i) a graft copolymer of maleic anhydride onto an olefin polymer or copolymer and (ii) an upgrafted propylene-based polymer; and adhesive blending containing from about 0.005% to 0.75% maleic anhydride based on the total weight of the entire blend composition.
Claim 2
Dependent Claim
80 words
A multiple layer plastic film, comprising: (a) a layer of polypropylene; (b) a layer of nylon; and (c) a functionally adhesive layer juxtaposed between said nylon layer and said polypropylene layer, said adhesive layer being a blend consisting essentially of (i) a graft copolymer of maleic anhydride onto an olefin polymer or copolymer and (ii) an upgrafted propylene-based polymer; and adhesive blending containing from about 0.005% to 0.75% maleic anhydride based on the total weight of the entire blend composition.
Claim 3
Dependent Claim
20 words
A plastic film as in claim 1 wherein the polypropylene layer in subparagraph (a) contains polyethylene up to about 50%.
Claim 4
Dependent Claim
43 words
A plastic film as in claim 1 and including an additional layer of ethylene vinyl alcohol copolymer affixed on one of its surfaces to said nylon, and a further layer of nylon affixed to the other surface of said ethylene vinyl alcohol copolymer.
Claim 5
Dependent Claim
43 words
A plastic film as in claim 2 and including an additional layer of ethylene vinyl alcohol copolymer affixed on one of its surfaces to said nylon, and a further layer of nylon affixed to the other surface of said ethylene vinyl alcohol copolymer.
Claim 6
Dependent Claim
70 words
A plastic film as in claim 1 wherein said ungrafted propylene-based polymer contains less than 20% ethylene moieties by weight and wherein said graft copolymer contains 0.1% to 2.5% maleic anhydride based on the total weight of the graft copolymer, said graft copolymer comprising between about 5% and 30% by weight of the blend, and said ungrafted propylene-based polymer comprising between about 70% and 95% by weight of the blend.
Claim 7
Dependent Claim
20 words
A plastic film as in claim 5 wherein the polypropylene layer in subparagraph (a) contains up to about 50% ethylene.
Claim 8
Dependent Claim
43 words
A plastic film as in claim 5 and including an additional layer of ethylene vinyl alcohol copolymer affixed on one of its surfaces to said nylon, and a further layer of nylon affixed to the other surface of said ethylene vinyl alcohol copolymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |