US4734331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer structure having at least one polycarbonate layer
Assignee: General Electric Co
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Filing: 1986-04-18
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Granted: 1988-03-29
•
Expires: 2006-04-18
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
2026-11-02 14:55
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B2272/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/31928
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
49 words
A multilayer structure comprising: (i) at least one polycarbonate layer; (ii) at least one olefin vinyl alcohol layer; and (iii) at least one unmodified polyolefin layer; said layers being adhered together by means of tie layers disposed therebetween said tie layers being comprised of an olefin vinyl ester copolymer.
Claim 2
Dependent Claim
49 words
A multilayer structure comprising: (i) at least one polycarbonate layer; (ii) at least one olefin vinyl alcohol layer; and (iii) at least one unmodified polyolefin layer; said layers being adhered together by means of tie layers disposed therebetween said tie layers being comprised of an olefin vinyl ester copolymer.
Claim 3
Dependent Claim
11 words
The structure of claim 1 wherein said unmodified polyolefin is polypropylene.
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 3 wherein said unmodified polyolefin is polypropylene.
Claim 6
Dependent Claim
65 words
The structure of claim 1 wherein said polycrbonate contains at least one recurring structural unit represented by the formula ##STR4## wherein R is independently selected from monovalent hydrocarbon radicals and halogen radicals, A is selected from divalent hydrocarbon radicals, --O--, --S--, --S--S--, ##STR5## b is either zero or one, and n is independently selected from integers having a value of from 0 to 4 inclusive.
Claim 7
Dependent Claim
9 words
The structure of claim 5 wherein b is one.
Claim 8
Dependent Claim
12 words
The structure of claim 6 wherein A is a divalent hydrocarbon radical.
Claim 9
Dependent Claim
12 words
The structure of claim 7 wherein said divalent hydrocarbon radicals is 2,2-propylidene.
Claim 10
Dependent Claim
9 words
The structure of claim 8 wherein n is zero.
Claim 11
Dependent Claim
17 words
The structure of claim 1 wherein said olefin vinyl ester copolymer is an olefin vinyl acetate copolymer.
Claim 12
Dependent Claim
16 words
The structure of claim 10 wherein said olefin vinyl acetate copolymer is ethylene vinyl acetate copolymer.
Claim 13
Dependent Claim
14 words
The structure of claim 11 wherein said olefin vinyl alcohol is ethylene vinyl alcohol.
Claim 14
Dependent Claim
11 words
the structure of claim 12 wherein said unmodified polyolefin is polypropylene.
Claim 15
Dependent Claim
32 words
The structure of claim 1 which contains one polycarbonate layer, one unmodified polyolefin layer, and one olefin vinyl alcohol layer adhered together by means of said olefin vinyl ester copolymer tie layers.
Claim 16
Dependent Claim
44 words
The structure of claim 14 wherein said olefin vinyl alcohol layer is an intermediate layer disposed between a polycarbonate outer layer and an unmodified polyolefin outer layer and is adhered to said outer layers by means of said olefin vinyl ester copolymer tie layers.
Claim 17
Dependent Claim
48 words
A multilayer structure comprising: (i) at least one polycarbonate layer; (ii) at least one olefin vinyl alcohol layer; and (iii) at least one unmodified polyolefin layer; said layers being adhered together by means of ties layers disposed therebetween, said tie layers consisting essentially of a modified polyolefin copolymer.
Claim 18
Dependent Claim
48 words
A multilayer structure comprising: (i) at least one polycarbonate layer; (ii) at least one olefin vinyl alcohol layer; and (iii) at least one unmodified polyolefin layer; said layers being adhered together by means of ties layers disposed therebetween, said tie layers consisting essentially of a modified polyolefin copolymer.
Claim 19
Dependent Claim
11 words
The structure of claim 16 wherein said unmodified polyolefin is polypropylene.
Claim 20
Dependent Claim
25 words
The structure of claim 16 wherein said modified polyolefin copolmer is a graft copolymer of a polyolefin and a carboxylic acid or a carboxylic anhydride.
Claim 21
Dependent Claim
23 words
The structure of claim 18 wherein said polyolefin portion of said modified polyolefin copolymer is a polymer derived from at least the alpha-olefin.
Claim 22
Dependent Claim
16 words
The structure of claim 19 wherein said alpha-olefim is selected from ethylene, propylene, or mixtures thereof.
Claim 23
Dependent Claim
17 words
The structure of claim 18 wherein said carboxylic acid is selected from acrylic acids and methacrylic acids.
Claim 24
Dependent Claim
12 words
The structure of claim 21 wherein said carboxylic acid is acrylic acid.
Claim 25
Dependent Claim
12 words
The structure of claim 18 wherein said carboxylic anhydride is maleic anhydride.
Claim 26
Dependent Claim
14 words
The structure of claim 16 wherein said olefin vinyl alcohol is ethylene vinyl alcohol.
Claim 27
Dependent Claim
11 words
The structure of claim 24 wherein said unmodified polyolefin is polypropylene.
Claim 28
Dependent Claim
64 words
The structure of claim 16 wherein said polycarbonate contains at least one recurring structural unit represented by the formula ##STR6## wherein R is independently selected from monovalent hydrocarbon radicals and halogen radicals, A is selected from divalent hydrocarbon radicals, --O--, --S--, ##STR7## b is either zero or one, and n is independently seIected from integers having a value of from 0 to 4 inclusive.
Claim 29
Dependent Claim
9 words
The structure of claim 26 wherein b is one.
Claim 30
Dependent Claim
12 words
The structure of claim 27 wherein A is a divalent hydrocarbon radical.
Claim 31
Dependent Claim
12 words
The structure of claim 28 wherein said divalent hydrocarbon radical is 2,2-propylidene.
Claim 32
Dependent Claim
9 words
The structure of claim 29 wherein n is zero.
Claim 33
Dependent Claim
31 words
The structure of claim 16 which contains one polycarbonate layer, one unmodified polyolefin layer, and one olefin vinyl alcohol layer adhered together by means of said modified polyolefin copolymer tie layers.
Claim 34
Dependent Claim
43 words
The structure of claim 31 wherein said olefin vinyl alcohol layer is an intermediate layer disposed between a polycarbonate outer layer and an unmodified polyolefin outer layer and is adhered to said outer layers by means of said modified polyolefin copolymer tie layers.
Claim 35
Dependent Claim
41 words
A multilayer laminar structure consisting essentially of: (i) at least one polycarbonate layer; (ii) at least one olefin vinyl alcohol layer; and (iii) at least one unmodified polyolefiin layer; said layers being adhered together by means of tie layers disposed therebetween.
Claim 36
Dependent Claim
41 words
A multilayer laminar structure consisting essentially of: (i) at least one polycarbonate layer; (ii) at least one olefin vinyl alcohol layer; and (iii) at least one unmodified polyolefiin layer; said layers being adhered together by means of tie layers disposed therebetween.
Claim 37
Dependent Claim
11 words
The structure of claim 33 wherein said unmodified polyolefin is polypropylene.
Claim 38
Dependent Claim
14 words
The structure of claim 33 wherein said olefin vinyl alcohol is ethylene vinyl alcohol.
Claim 39
Dependent Claim
11 words
the structure of claim 35 wherein said unmodified polyolefin is polypropylene.
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) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |