Patent US4657972A successfully refreshed from Google Patents.
US4657972A
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US
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Polycarbonate compositions
Assignee: General Electric Co
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Filing: 1986-03-28
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Granted: 1987-04-14
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Expires: 2006-03-28
Abstract
Abstract A multilayer composition comprising at least one polycarbonate layer, at least one polyolefin layer, and at least one olefin vinyl alcohol layer, said layers being adhered together by means of tie layers containing a tie material selected from modified polyolefin graft copolymers and olefin vinyl ester copolymers.
Inventors
- 👤 Harold F. Giles, Jr.
- 👤 Robert P. Hirt, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:18
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
41 words
A composition comprising a physical admixture of: (i) at least one polycarbonate; (ii) at least one polyolefin; (iii) at least one olefin vinyl alcohol copolymer; and (iv) at least one material selected from olefin vinyl ester copolymers and modified polyolefin copolymers.
Claim 2
Dependent Claim
41 words
A composition comprising a physical admixture of: (i) at least one polycarbonate; (ii) at least one polyolefin; (iii) at least one olefin vinyl alcohol copolymer; and (iv) at least one material selected from olefin vinyl ester copolymers and modified polyolefin copolymers.
Claim 3
Dependent Claim
24 words
The composition of claim 1 wherein said modified polyolefin copolymer is a graft copolymer of a polyolefin and a carboxylic acid or carboxylic anhydride.
Claim 4
Dependent Claim
18 words
The composition of claim 2 which contains a major amount of (i)-(iii) and a minor amount of (iv).
Claim 5
Dependent Claim
15 words
The composition of claim 3 which contains at least about 70 weight percent of (i)-(iii).
Claim 6
Dependent Claim
16 words
The composition of claim 4 which contains a maximum of about 30 weight percent of (iv).
Claim 7
Dependent Claim
14 words
The composition of claim 5 wherein said olefin vinyl alcohol is ethylene vinyl alcohol.
Claim 8
Dependent Claim
10 words
The composition of claim 6 wherein said polyolefin is polypropylene.
Claim 9
Dependent Claim
11 words
The composition of claim 7 wherein said polycarbonate is bipshenol-A polycarbonate.
Claim 10
Dependent Claim
10 words
The composition of claim 1 which further contains a filler.
Claim 11
Dependent Claim
16 words
The composition of claim 1 which further contains an impact modifying amount of an impact modifier.
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) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |