Patent US4758477A successfully refreshed from Google Patents.
US4758477A
Expired / Lapsed
US
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Laminate and process for its production
Assignee: Mitsubishi Chemical Corp
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Filing: 1986-02-26
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Granted: 1988-07-19
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Expires: 2006-02-26
Abstract
Abstract A process for producing a laminate which comprises laminating a composition comprising from 70 to 98% by weight of a crystalline ethylene-vinyl acetate copolymer having a vinyl acetate content of from 5 to 15% by weight, and from 2 to 30% by weight of a modified ethylene copolymer obtained by graft-polymerizing at least 0.03 and less than 1% by weight of maleic anhydride to a copolymer of ethylene with an alpha -olefin of at least 3 carbon atoms having a crystallinity of less than 30%, on a polyamide resin, a polyester resin or a saponified ethylene-vinyl acetate copolymer, in a molten state.
Inventors
- 👤 Shigeaki Okano
- 👤 Katsuhiko Hayashi
- 👤 Hidehito Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:27
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/32; B32B27/34; B32B2307/00; B32B2307/50; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2323/00; B32B2323/04; B32B2323/10; B32B2331/00; B32B2331/04; B32B2377/00; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31736; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/3175; Y10T428/31757; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
105 words
A process for producing a laminate which comprises laminating (A) a composition comprising (i) from 70 to 98% by weight of a crystalline ethylene-vinyl acetate copolymer having a vinyl acetate content of from 5 to 15% by weight, and (ii) from 2 to 30% by weight of a modified ethylene copolymer obtained by graft-polymerizing at least 0.03 and less than 1% by weight of maleic anhydride to a copolymer of ethylene with an α-olefin of at least 3 carbon atoms having a crystallinity of less than 30% onto (B) a polyamide resin, a polyester resin or a saponified ethylene-vinyl acetate copolymer, in a molten state.
Claim 2
Dependent Claim
105 words
A process for producing a laminate which comprises laminating (A) a composition comprising (i) from 70 to 98% by weight of a crystalline ethylene-vinyl acetate copolymer having a vinyl acetate content of from 5 to 15% by weight, and (ii) from 2 to 30% by weight of a modified ethylene copolymer obtained by graft-polymerizing at least 0.03 and less than 1% by weight of maleic anhydride to a copolymer of ethylene with an α-olefin of at least 3 carbon atoms having a crystallinity of less than 30% onto (B) a polyamide resin, a polyester resin or a saponified ethylene-vinyl acetate copolymer, in a molten state.
Claim 3
Dependent Claim
40 words
The process according to claim 1, wherein the crystalline ethylene-vinyl acetate copolymer contains a high-pressure low-density polyethylene, a high-density polyethylene or a linear low-density polyethylene, and said composition has a vinyl acetate content of from 5 to 15% by weight.
Claim 4
Dependent Claim
60 words
The process according to claim 1, wherein the modified ethylene copolymer is obtained by graft-polymerizing at least 0.03 and less than 1% by weight of maleic anhydride to an ethylene-butene-1 or ethylene-propylene copolymer having a crystallinity of at least 2% and less than 30%, which is lower by at least 10% than the crystallinity of the crystalline ethylenevinyl acetate copolymer.
Claim 5
Dependent Claim
70 words
The process according to claim 1, wherein the modified ethylene copolymer is obtained by incorporating at least 0.03 and less than 1% by weight of maleic anhydride and from 0.01 to 0.05% by weight of an organic peroxide to an ethylene-butene-1 or ethylene-propylene copolymer having a crystallinity of at least 2% and less than 30%, and melt-mixing the mixture at a temperature of from 120° to 300° C. for graft-polymerization.
Claim 6
Dependent Claim
34 words
The process according to claim 1, wherein the composition comprises from 80 to 95% by weight of the crystalline ethylene-vinyl acetate copolymer and from 5 to 20% by weight of the modified ethylene copolymer.
Claim 7
Dependent Claim
19 words
The process according to claim 1, wherein the composition is laminated on a polyamide resin in a molten state.
Claim 8
Dependent Claim
19 words
The process according to claim 1, wherein the composition is laminated on a polyester resin in a molten state.
Claim 9
Dependent Claim
21 words
The process according to claim 1, wherein the composition is laminated on a saponified ethylene-vinyl acetate copolymer in a molten state.
Claim 10
Dependent Claim
97 words
A laminate comprising a layer of a composition comprising from 70 to 98% by weight of a crystalline ethylene-vinyl acetate copolymer having a vinyl acetate content of from 5 to 15% by weight, and from 2 to 30% by weight of a modified ethylene copolymer obtained by graft-polymerizing at least 0.03 and less than 1% by weight of maleic anhydride to a copolymer of ethylene with an α-olefin of at least 3 carbon atoms having a crystallinity of less than 30%, and a layer of a polyamide resin, a polyester resin or a saponified ethylene-vinyl acetate copolymer.
Claim 11
Dependent Claim
97 words
A laminate comprising a layer of a composition comprising from 70 to 98% by weight of a crystalline ethylene-vinyl acetate copolymer having a vinyl acetate content of from 5 to 15% by weight, and from 2 to 30% by weight of a modified ethylene copolymer obtained by graft-polymerizing at least 0.03 and less than 1% by weight of maleic anhydride to a copolymer of ethylene with an α-olefin of at least 3 carbon atoms having a crystallinity of less than 30%, and a layer of a polyamide resin, a polyester resin or a saponified ethylene-vinyl acetate copolymer.
Claim 12
Dependent Claim
40 words
The laminate according to claim 9, wherein the crystalline ethylene-vinyl acetate copolymer contains a high-pressure low-density polyethylene, a high-density polyethylene or a linear low-density polyethylene, and said composition has a vinyl acetate content of from 5 to 15% by weight.
Claim 13
Dependent Claim
60 words
The laminate according to claim 9, wherein the modified ethylene copolymer is obtained by graft-polymerizing at least 0.03 and less than 1% by weight of maleic anhydride to an ethylene-butene-1 or ethylene-propylene copolymer having a crystallinity of at least 2% and less than 30%, which is lower by at least 10% than the crystallinity of the crystalline ethylenevinyl acetate copolymer.
Claim 14
Dependent Claim
70 words
The laminate according to claim 9, wherein the modified ethylene copolymer is obtained by incorporating at least 0.03 and less than 1% by weight of maleic anhydride and from 0.01 to 0.05% by weight of an organic peroxide to an ethylene-butene-1 or ethylene-propylene copolymer having a crystallinity of at least 2% and less than 30%, and melt-mixing the mixture at a temperature of from 120° to 300° C. for graft-polymerization.
Claim 15
Dependent Claim
34 words
The laminate according to claim 9, wherein the composition comprises from 80 to 95% by weight of the crystalline ethylene-vinyl acetate copolymer and from 5 to 20% by weight of the modified ethylene copolymer.
References Cited (Backward Citations)
JPS5143055A
Cited
JPS5198784A
Cited
US4058647A
Cited
JPS528035A
Cited
JPS5225845A
Cited
JPS5311032A
Cited
JPS5482A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |