US4713296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminate having good gas barrier properties with barrier layer of modified ethylene-vinyl alcohol copolymer
Assignee: Kuraray Co Ltd
•
Filing: 1986-06-12
•
Granted: 1987-12-15
•
Expires: 2006-06-12
Abstract
Abstract There is provided a laminate having good gas barrier properties which comprises at least one barrier layer of modified ethylene-vinyl alcohol copolymer containing 0.1 to 5 mol % of pyrrolidone ring-containing units and 20 to 55 mol % of ethylene units, with the degree of saponification of the vinyl acetate component being at least 98 mol %, and at least one layer of thermoplastic resin. This laminate is superior in drawability, and can be made by drawing into bottles, cups, and the like which exhibit excellent clarity, appearance, and gas barrier properties.
Inventors
- 👤 Akimasa Aoyama
- 👤 Takeshi Moritani
- 👤 Kiyoshi Yonezu
- 👤 Taichi Negi
- 👤 Takuji Okaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:57
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/31504; Y10T428/31507; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
A laminate having good gas barrier properties which comprises at least one barrier layer of modified ethylene-vinyl alcohol copolymer and at least one layer of thermoplastic resin, said modified ethylene-vinyl alcohol copolymer being a saponified product of pyrrolidone ring containing ethylene-vinyl acetate copolymer, having a pyrrolidone ring-containing unit of 0.01 to 5 mol %, ethylene unit of 20 to 55 mol % and a degree of saponification of the vinyl acetate component of at least 98 mol %.
Claim 2
Dependent Claim
78 words
A laminate having good gas barrier properties which comprises at least one barrier layer of modified ethylene-vinyl alcohol copolymer and at least one layer of thermoplastic resin, said modified ethylene-vinyl alcohol copolymer being a saponified product of pyrrolidone ring containing ethylene-vinyl acetate copolymer, having a pyrrolidone ring-containing unit of 0.01 to 5 mol %, ethylene unit of 20 to 55 mol % and a degree of saponification of the vinyl acetate component of at least 98 mol %.
Claim 3
Dependent Claim
20 words
A laminate having good gas barrier properties as set forth in claim 1, wherein the pyrrolidone ring-containing unit is N-vinyl-2-pyrrolidone.
Claim 4
Dependent Claim
48 words
A laminate having good gas barrier properties as set forth in claim 1, wherein the modified ethylene-vinyl alcohol copolymer has an intrinsic viscosity of 0.07 to 0.17 l/g as measured in a mixed solvent composed of 85 wt% of phenol and 15 wt% of water at 30° C.
Claim 5
Dependent Claim
43 words
A laminate having good gas barrier properties as set forth in claim 1, wherein the thermoplastic resin is at least one member selected from the group consisting of polypropylene, polyethylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, thermoplastic polyester, polyamide, polystyrene, polyvinyl chloride, and polycarbonate.
Claim 6
Dependent Claim
16 words
A laminate having good gas barrier properties as set forth in claim 1, from packaging food.
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) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |