US4451512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layer plastic vessel
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1983-06-24
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Granted: 1984-05-29
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Expires: 2003-06-24
Abstract
Abstract Disclosed is a multi-layer plastic vessel comprising a laminate including at least one layer composed mainly of a moisture-resistant thermoplastic resin, at least one layer composed mainly of an ethylene-vinyl alcohol copolymer and a thermoplastic resin adhesive layer interposed between both the resin layers, wherein said adhesive layer is composed of a composition comprising an acid- or acid anhydride-modified olefin resin and an epoxidized unsaturated carboxylic acid ester.
Inventors
- 👤 Jinichi Yazaki
- 👤 Kozaburo Sakano
- 👤 Junichi Matsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:22
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C49/00; B29C49/22; B32B1/00; B32B27/30; B32B27/306; B32B27/32; B32B7/00; B32B7/04; B32B7/12; B65; B65D; B65D1/00; B65D1/02; B65D1/0207; B65D1/0215; B29K; B29K2995/00; B29K2995/0037; B29K2995/0068; B29K2995/0069; B32B2250/00; B32B2250/03; B32B2250/24; B32B2250/246; B32B2307/00; B32B2307/70; B32B2307/718; B32B2307/724; B32B2307/7242; B32B2307/726; B32B2307/7265; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2439/00; B32B2439/40; B32B2439/60; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
66 words
A multi-layer plastic vessel comprising a laminate including at least one layer composed mainly of a moisture-resistant thermoplastic resin, at least one layer composed mainly of an ethylene-vinyl alcohol copolymer and a thermoplastic resin adhesive layer interposed between both the resin layers, wherein said adhesive layer is composed of a composition comprising an acid- or acid anhydride-modified olefin resin and an epoxidized unsaturated carboxylic acid ester.
Claim 2
Dependent Claim
66 words
A multi-layer plastic vessel comprising a laminate including at least one layer composed mainly of a moisture-resistant thermoplastic resin, at least one layer composed mainly of an ethylene-vinyl alcohol copolymer and a thermoplastic resin adhesive layer interposed between both the resin layers, wherein said adhesive layer is composed of a composition comprising an acid- or acid anhydride-modified olefin resin and an epoxidized unsaturated carboxylic acid ester.
Claim 3
Dependent Claim
44 words
A multi-layer plastic vessel as set forth in claim 1, wherein the modified olefin resin is an olefin resin modified with acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, maleic anhydride, itaconic anhydride, citraconic anhydride or tetrahydrophthalic anhydride.
Claim 4
Dependent Claim
23 words
A multi-layer plastic vessel as set forth in claim 1, wherein the modified olefin resin is an olefin resin modified with maleic anhydride.
Claim 5
Dependent Claim
55 words
A multi-layer plastic vessel as set forth in claim 1, wherein the modified olefin resin is at least one member selected from the group consisting of low density polyethylene, medium density polyethylene, high density polyethylene, isotactic polypropylene, a propylene-ethylene copolymer, a propylene-butene-1 copolymer, a propylene-ethylene-butene-1 copolymer, an ethylene-vinyl acetate copolymer and an ion-crosslinked olefin copolymer.
Claim 6
Dependent Claim
25 words
A multi-layer plastic vessel as set forth in claim 1, wherein the composition constituting the adhesive layer further comprises at least one unmodified olefin resin.
Claim 7
Dependent Claim
80 words
A multi-layer plastic vessel as set forth in claim 1, wherein the epoxidized unsaturated carboxylic acid ester is a member selected from the group consisting of epoxidized soybean oil, epoxidized castor oil, epoxidized linseed oil, epoxidized safflower oil, epoxidized linseed oil fatty acid butyl ester, epoxidized octyl oleate, epoxidized iso-octyl oleate, epoxidized 2-ethylhexyl oleate and epoxy hexahydrophthalic acid esters represented by the following formula: ##STR2## wherein R stands for a higher alkyl group such as a 2-ethylhexyl or isododecyl group.
Claim 8
Dependent Claim
69 words
A multi-layer plastic vessel as set forth in claim 1, wherein in the composition constituting the adhesive layer, the concentration of the carbonyl groups based on the acid- or acid anhydride-modified olefin resin is 1 to 600 millimoles per 100 g of the composition and the concentration of oxirane oxygen based on the epoxidized unsaturated carboxylic acid ester is 0.01 to 50 millimoles per 100 g of the composition.
Claim 9
Dependent Claim
43 words
A multi-layer plastic vessel as set forth in claim 1, wherein the ethylene-vinyl alcohol copolymer contains 40 to 80 mole % of vinyl alcohol units and the residual vinyl ester unit content in the ethylene-vinyl alcohol copolymer is up to 4 mole %.
Claim 10
Dependent Claim
45 words
A multi-layer plastic vessel as set forth in claim 1, wherein the ethylene-vinyl alcohol copolymer has an inherent viscosity of 0.07 to 0.17 l/g as measured at 30° C. in a mixed solvent comprising 85% by weight of phenol and 15% by weight of water.
Claim 11
Dependent Claim
44 words
A multi-layer plastic vessel as set forth in claim 1, wherein the layer composed mainly of the ethylene-vinyl alcohol copolymer is a layer composed of a blend comprising an ethylene-vinyl alcohol copolymer and a polyamide at a weight ratio of from 95/5 to 40/60.
Claim 12
Dependent Claim
57 words
A multi-layer plastic vessel as set forth in claim 1, wherein the moisture-resistant thermoplastic resin is an olefin resin selected from the group consisting of low density polyethylene, medium density polyethylene, high density polyethylene, isotactic polypropylene, a crystalline propylene-ethylene copolymer, a crystalline propylene-butene-1 copolymer, a crystalline propylene-butene-1-ethylene terpolymer, an ethylene-vinyl acetate copolymer and an ion-crosslinked olefin copolymer.
Claim 13
Dependent Claim
31 words
A multi-layer plastic vessel as set forth in claim 1, wherein the moisture-resistant thermoplastic resin is a member selected from the group consisting of thermoplastic polyesters, polycarbonates and film-forming acrylic resins.
Claim 14
Dependent Claim
21 words
A multi-layer plastic vessel as set forth in claim 1, wherein the thickness of the laminate is 50 to 3000 microns.
Claim 15
Dependent Claim
47 words
A multi-layer plastic vessel as set forth in claim 1, wherein the moisture-resistant thermoplastic resin layer/ethylene-vinyl alcohol copolymer thickness ratio is in the range of from 200/1 to 5/1 and the moisture-resistant thermoplastic resin layer/adhesive layer thickness ratio is in the range of from 150/1 to 5/1.
Claim 16
Dependent Claim
34 words
A multi-layer plastic vessel as set forth in claim 1, which is formed by draw-blow molding of a multi-layer parison of said laminate or by sheet-molding of a film or sheet of said laminate.
Claim 17
Dependent Claim
20 words
A multi-layer plastic vessel as set forth in claim 1, which is in the form of a bottle or cup.
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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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |