US4608311A
Expired / Lapsed
US
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Multilayer polycarbonate structures
Assignee: General Electric Co
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Filing: 1985-01-02
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Granted: 1986-08-26
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Expires: 2005-01-02
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
2026-11-03 19:09
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/30; B32B27/306; B32B27/32; B32B27/36; B32B27/365; B32B7/00; B32B7/04; B32B7/12; B32B2272/00; B32B2323/00; B32B2323/10; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
60 words
A multilayer structure consisting essentially of: (i) at least one polycarbonate layer; (ii) at least one olefin alcohol layer; and (iii) at least one unmodified polyolefin layer; said layers being adhered together by means of tie layers disposed between said layers, said tie layers consisting essentially of a tie material selected from olefin vinyl ester copolymers and modified polyolefin copolymers.
Claim 2
Dependent Claim
60 words
A multilayer structure consisting essentially of: (i) at least one polycarbonate layer; (ii) at least one olefin alcohol layer; and (iii) at least one unmodified polyolefin layer; said layers being adhered together by means of tie layers disposed between said layers, said tie layers consisting essentially of a tie material selected from olefin vinyl ester copolymers and modified polyolefin copolymers.
Claim 3
Dependent Claim
14 words
The structure of claim 1 wherein said olefin vinyl ester is ethylene vinyl acetate.
Claim 4
Dependent Claim
14 words
The structure of claim 1 wherein said olefin vinyl alcohol is ethylene vinyl alcohol.
Claim 5
Dependent Claim
11 words
The structure of claim 1 wherein said unmodified polyolefin is polypropylene.
Claim 6
Dependent Claim
25 words
The structure of claim 1 wherein said modified polyolefin copolymer is a graft copolymer of a polyolefin and a carboxylic acid or a carboxylic anhydride.
Claim 7
Dependent Claim
14 words
The structure of claim 5 wherein said polyolefin is a polymer of an alpha-olefin.
Claim 8
Dependent Claim
14 words
The structure of claim 6 wherein said alpha-olefin is ethylene, propylene, and mixtures thereof.
Claim 9
Dependent Claim
17 words
The structure of claim 7 wherein said carboxylic acid is selected from acrylic acids and methacrylic acids.
Claim 10
Dependent Claim
12 words
The structure of claim 8 wherein said carboxylic acid is acrylic acid.
Claim 11
Dependent Claim
12 words
The structure of claim 9 wherein said carboxylic anhydride is maleic anhydride.
Claim 12
Dependent Claim
28 words
The structure of claim 1 which contains a polycarbonate layer, a unmodified polyolefin layer, and a olefin vinyl alcohol layer bonded together by means of said tie layers.
Claim 13
Dependent Claim
12 words
The structure of claim 11 wherein said polycarbonate is a bisphenol-A polycarbonate.
Claim 14
Dependent Claim
11 words
The structure of claim 11 wherein said unmodified polyolefin is polypropylene.
Claim 15
Dependent Claim
14 words
The structure of claim 11 wherein said olefin vinyl alcohol is ethylene vinyl alcohol.
Claim 16
Dependent Claim
34 words
The structure of claim 11 wherein said olefin vinyl alcohol is an intermediate layer disposed between a polycarbonate layer and a unmodified polyolefin layer and is bonded thereto by means of said tie layers.
Claim 17
Dependent Claim
14 words
The structure of claim 15 wherein said unmodified polyolefin layer is comprised of polypropylene.
Claim 18
Dependent Claim
17 words
The structure of claim 16 wherein said olefin vinyl alcohol layer is comprised of ethylene vinyl alcohol.
Claim 19
Dependent Claim
14 words
The structure of claim 17 wherein said polycarbonate layer is comprised of bisphenol-A polycarbonate.
Claim 20
Dependent Claim
25 words
The structure of claim 18 wherein said tie layers consist essentially of a tie material selected from olefin vinyl ester copolymers and modified polyolfin copolymers.
Claim 21
Dependent Claim
16 words
The structure of claim 19 wherein said tie layers consist essentially of a modified polyolefin copolymer.
Claim 22
Dependent Claim
25 words
The structure of claim 20 wherein said modified polyolefin copolymer is a graft copolymer of a polyolfin and a carboxylic acid or a carboxylic anhydride.
Claim 23
Dependent Claim
17 words
The strucrue of claim 21 wherein said carboxylic acid is selected from acrylic acids and methacrylic acids.
Claim 24
Dependent Claim
12 words
The structure of claim 22 wherein said acrylic acid is acrylic acid.
Claim 25
Dependent Claim
14 words
The structure of claim 22 wherein said polyolefin component is derived from an alpha-olefin.
Claim 26
Dependent Claim
16 words
The structure of claim 24 wherein said alpha-olefin is selected from ethylene, propylene, and mixtures thereof.
Claim 27
Dependent Claim
12 words
The structure of claim 24 wherein said carboxylic anhydride is maleic anhydride.
Claim 28
Dependent Claim
16 words
The structure of claim 19 wherein said tie layers consist essentially of a olefin vinyl ester.
Claim 29
Dependent Claim
10 words
The structure of claim 27 wherein said olefin is ethylene.
Claim 30
Dependent Claim
10 words
The structure of claim 28 wherein said ester is acetate.
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) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |