US4281045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layer extruded article
Assignee: Kyoraku Co Ltd
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Filing: 1979-11-29
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Granted: 1981-07-28
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Expires: 1999-11-29
Abstract
Abstract A multi-layer extruded article useful for packaging materials, comprising a gas-barrier layer and a polyolefin layer laminated on at least one of the opposite sides of the gas-barrier layer, the gas-barrier layer being made of a mixture comprising a saponification product of an ethylene-vinyl acetate copolymer, a saponification product of an ethylene-vinyl acetate copolymer having a different ethylene content from the first saponification product, and a polyvinyl alcohol.
Inventors
- 👤 Takehiko Sumi
- 👤 Yoshinobu Oshige
- 👤 Yoshio Koike
- 👤 Kazuya Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:51
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B2250/00; B32B2250/03; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928; Y10T428/31935; Y10T428/31938
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
186 words
A multi-layer extruded article comprising a gas-barrier layer and a polyolefin layer laminated on at least one of the opposite sides of the gas-barrier layer, the gas-barrier layer being made of a mixture comprising (a) a saponification product of an ethylene-vinyl acetate copolymer having an ethylene content of from 25 to 50 mol percent and a saponification degree of not less than 90 percent (Saponification Product A), (b) a saponification product of an ethylene-vinyl acetate copolymer having an ethylene content of from 60 to 98 mol percent and a saponification degree of not less than 20 percent (Saponification Product B), and (c) a polyvinyl alcohol having an average polymerization degree of from 300 to 3000 and a saponification degree of not less than 70 percent, wherein the ratio of the amounts of the aforementioned two saponification products (A:B) is in the range of from 98:2 to 50:50 by weight and wherein the amount of the polyvinyl alcohol is in the range of from 5 to 100 parts by weight per 100 parts by weight of the total weight of the two saponification products (A and B).
Claim 2
Dependent Claim
186 words
A multi-layer extruded article comprising a gas-barrier layer and a polyolefin layer laminated on at least one of the opposite sides of the gas-barrier layer, the gas-barrier layer being made of a mixture comprising (a) a saponification product of an ethylene-vinyl acetate copolymer having an ethylene content of from 25 to 50 mol percent and a saponification degree of not less than 90 percent (Saponification Product A), (b) a saponification product of an ethylene-vinyl acetate copolymer having an ethylene content of from 60 to 98 mol percent and a saponification degree of not less than 20 percent (Saponification Product B), and (c) a polyvinyl alcohol having an average polymerization degree of from 300 to 3000 and a saponification degree of not less than 70 percent, wherein the ratio of the amounts of the aforementioned two saponification products (A:B) is in the range of from 98:2 to 50:50 by weight and wherein the amount of the polyvinyl alcohol is in the range of from 5 to 100 parts by weight per 100 parts by weight of the total weight of the two saponification products (A and B).
Claim 3
Dependent Claim
33 words
The multi-layer extruded article according to claim 1, wherein the saponification product A is a saponification product of an ethylene-vinyl acetate copolymer which has a saponification degree of not less than 96 percent.
Claim 4
Dependent Claim
44 words
The multi-layer extruded article according to claim 1, wherein the saponification product B is a saponification product of an ethylene-vinyl acetate copolymer which has an ethylene content of from 70 to 95 mol percent and a saponification degree of not less than 50 percent.
Claim 5
Dependent Claim
22 words
The multi-layer extruded article according to claim 1, wherein the polyvinyl alcohol has an average polymerization degree of from 500 to 2000.
Claim 6
Dependent Claim
32 words
The multi-layer extruded article according to claim 1, wherein the polyolefin is one member selected from the group consisting of low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymers, polybutene-1 and polyheptene-1.
Claim 7
Dependent Claim
36 words
The multi-layer extruded article according to claim 1, which is formed in a three-layer construction comprising a gas-barrier layer as an intermediate layer and polyolefin layers respectively laminated on the opposite sides of the intermediate layer.
Claim 8
Dependent Claim
21 words
The multi-layer extruded article according to claim 1 or claim 6, wherein the extruded article is formed by the coextrusion process.
References Cited (Backward Citations)
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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) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |