US4772348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a gas barrier laminate
Assignee: Artience Co Ltd
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Filing: 1987-07-20
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Granted: 1988-09-20
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Expires: 2007-07-20
Abstract
Abstract The disclosed laminate includes a layer of a saponified copolymer of ethylene and vinyl acetate thermally bonded directly (without use of an adhesive) to a layer of thermoplastic with a high interlayer adhesive strength therebetween. The laminate is produced by pretreating the surface of the thermoplastic layer to be bonded with a low temperature plasma and then thermally bonding the two layers together.
Inventors
- 👤 Atsushi Hirokawa
- 👤 Keisuke Kaiho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:07
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/30; B32B27/306; B32B27/06; B32B27/08; B32B27/302; B32B27/304; B32B27/32; B32B27/34; B32B27/36; B32B27/365; B32B38/00; B32B38/0008; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/516; B32B2307/518; B32B2310/00; B32B2310/14; B32B2323/00; B32B2325/00; B32B2327/00; B32B2327/06; B32B2331/00; B32B2331/04; B32B2367/00; B32B2369/00; B32B2377/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
127 words
A process for forming a laminate suitable for use as a gas barrier packaging material, said laminate comprising (1) a thermoplastic film or sheet and (2) a saponified ethylene-vinyl acetate copolymer film or sheet, without an adhesive between (1) and (2), wherein (2) contains 20-50 mol. % ethylene and has a degree of saponification of 90 mol. % or more, said process comprising treating a surface of the thermoplastic film or sheet with a low temperature plasma at 10 -3 to 1 Torr and at least 100 W for a period of time of at least 0.01 sec. and sufficient to provide a predetermined degree of adhesive strength between (1) and (2) and thermally bonding the treated surface to the saponified ethylene-vinyl acetate copolymer film or sheet.
Claim 2
Dependent Claim
127 words
A process for forming a laminate suitable for use as a gas barrier packaging material, said laminate comprising (1) a thermoplastic film or sheet and (2) a saponified ethylene-vinyl acetate copolymer film or sheet, without an adhesive between (1) and (2), wherein (2) contains 20-50 mol. % ethylene and has a degree of saponification of 90 mol. % or more, said process comprising treating a surface of the thermoplastic film or sheet with a low temperature plasma at 10 -3 to 1 Torr and at least 100 W for a period of time of at least 0.01 sec. and sufficient to provide a predetermined degree of adhesive strength between (1) and (2) and thermally bonding the treated surface to the saponified ethylene-vinyl acetate copolymer film or sheet.
Claim 3
Dependent Claim
50 words
The process of claim 1, wherein the thermoplastic film or sheet is a film or sheet of a member selected from the group consisting of polyesters, polyamides, polycarbonates, polyvinyl chloride, polyolefins, polystyrene and polyacrylonitrile, or a laminated film or sheet having at least one layer of one of said members.
Claim 4
Dependent Claim
26 words
The process of claim 1, wherein the thermoplastic film or sheet is polyethylene terephthalate film, or a laminated film or sheet having a polyethylene terephthalate layer.
Claim 5
Dependent Claim
20 words
The process of claim 1, wherein the thermoplastic film or sheet is uniaxially or biaxially stretched prior to thermal bonding.
Claim 6
Dependent Claim
20 words
The process of claim 3, wherein the thermoplastic film or sheet is uniaxially or biaxially stretched prior to thermal bonding.
Claim 7
Dependent Claim
32 words
The process of claim 1 wherein said low temperature plasma is in an atmosphere of a member selected from the group consisting of air, argon, nitrogen, oxygen, hydrogen, helium and mixtures thereof.
Claim 8
Dependent Claim
11 words
The process of claim 1 wherein said thermoplastic is polyethylene terephthalate.
Claim 9
Dependent Claim
11 words
The process of claim 3 wherein said thermoplastic is polyethylene terephthalate.
Claim 10
Dependent Claim
23 words
A process in accordance with claim 1 wherein said saponified film or sheet is an outermost layer of a laminated film or sheet.
Claim 11
Dependent Claim
18 words
A process in accordance with claim 1 wherein said predetermined adhesive strength is at least 400 g/15 mm.
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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) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |