US4361628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coextruded film of polypropylene, polypropylene blend, and nylon
Assignee: Pechiney Plastic Packaging Inc
•
Filing: 1981-02-20
•
Granted: 1982-11-30
•
Expires: 2001-02-20
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 a polypropylene backbone, the graft copolymer having been produced in a reaction carried out at a temperature of from about 80 DEG C. up to about 10 DEG C. below the melting point of the polypropylene.
Inventors
- 👤 Duane A. Krueger
- 👤 Thomas W. Odorzynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:31
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/34; B32B2323/00; B32B2323/04; B32B2323/10; B32B2377/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/31928; Y10T428/31931
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
A coextruded multiple layer plastic film comprising, in sequential order of layering: (a) polypropylene; (b) a functionally adhesive blend of a graft copolymer of maleic anhydride onto a polypropylene backbone and an ungrafted polypropylene, said graft copolymer having been produced in a reaction carried out at a temperature of from about 80° Celsius up to about 10° Celsius below the melting point of the polypropylene, said graft copolymer containing from about 0.5% to 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 polypropylene comprising between about 70% and 95% by weight of the blend; and (c) nylon.
Claim 2
Dependent Claim
117 words
A coextruded multiple layer plastic film comprising, in sequential order of layering: (a) polypropylene; (b) a functionally adhesive blend of a graft copolymer of maleic anhydride onto a polypropylene backbone and an ungrafted polypropylene, said graft copolymer having been produced in a reaction carried out at a temperature of from about 80° Celsius up to about 10° Celsius below the melting point of the polypropylene, said graft copolymer containing from about 0.5% to 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 polypropylene comprising between about 70% and 95% by weight of the blend; and (c) nylon.
Claim 3
Dependent Claim
21 words
A plastic film as in claim 1 wherein the polypropylene layer in subparagraph (a) contains up to about 20% polymeric ethylene.
Claim 4
Dependent Claim
23 words
A plastic film as in claim 1 or 2, said graft copolymer reaction having taken place in the presence of an organic peroxide.
Claim 5
Dependent Claim
45 words
A plastic film as in claim 1 or 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.
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) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |