US4389438A
Expired / Lapsed
US
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Process for preparing laminates
Assignee: Artience Co Ltd
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Filing: 1981-07-10
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Granted: 1983-06-21
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Expires: 2001-07-10
Abstract
Abstract A process for the preparation of laminates comprising the steps of (1) putting a thermoplastic resin sheet or film and a metal foil or sheet one upon another with a specific polyolefin type resin being interposed therebetween, (2) heating the thus interposed specific polyolefin type resin to a temperature not lower than the melting point of the specific polyolefin type resin to obtain an intermediate laminate and (3) laminating at least one of thermoplastic sheets or films and paper on the metal foil or sheet side of said intermediate laminate using therebetween an ordinary adhesive not requiring heating at a temperature not lower than said melting point at the time of lamination thereby to obtain a desired laminate. In one embodiment, this invention also relates to a foodstuff packaging container wherein the innermost layer is a polyolefin resin sheet or film.
Inventors
- 👤 Akira Ohtsuki
- 👤 Hirokichi Ishino
- 👤 Hiromu Sakai
- 👤 Takahiko Yamasoba
- 👤 Susumu Tsuchiko
- 👤 Takashi Yoshino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:14
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/085; B32B15/12; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/306; B32B27/32; B32B27/34; B32B27/36; B32B27/365; B32B37/00; B32B37/02; B32B37/06; B32B37/14; B32B37/15; B32B37/153; B32B7/00; B32B7/04; B32B7/12; B32B2264/00; B32B2264/10; B32B2264/105; B32B2307/00; B32B2307/70; B32B2307/704; B32B2317/00; B32B2317/12; B32B2323/00; B32B2327/00; B32B2327/06; B32B2331/00; B32B2331/04; B32B2367/00; B32B2369/00; B32B2377/00; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1303; Y10T428/1352; Y10T428/1355; Y10T428/1359; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/31551; Y10T428/31605; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
164 words
A process for preparing a final laminate comprising the steps of: putting a thermoplastic resin sheet or film and a metal foil or sheet one upon another with a specific polyolefin type resin being interposed therebetween, the specific polyolefin type resin being at least one member selected from the group consisting of carboxyl group-containing polyolefin resins and metal compound-added carboxyl group-containing polyolefin resins, heating the thus interposed specific polyolefin type resin through the metal foil or sheet to a temperature not lower than the melting point of the specific polyolefin type resin to obtain an intermediate laminate and laminating at least one member selected from the group consisting of paper and thermoplastic sheets or films, on the metal foil or sheet side of said intermediate laminate using therebetween an ordinary adhesive which does not require to be heated to a temperature not lower than the melting point of said specific polyolefin type resin at the time of lamination, thereby to obtain a final laminate.
Claim 2
Dependent Claim
164 words
A process for preparing a final laminate comprising the steps of: putting a thermoplastic resin sheet or film and a metal foil or sheet one upon another with a specific polyolefin type resin being interposed therebetween, the specific polyolefin type resin being at least one member selected from the group consisting of carboxyl group-containing polyolefin resins and metal compound-added carboxyl group-containing polyolefin resins, heating the thus interposed specific polyolefin type resin through the metal foil or sheet to a temperature not lower than the melting point of the specific polyolefin type resin to obtain an intermediate laminate and laminating at least one member selected from the group consisting of paper and thermoplastic sheets or films, on the metal foil or sheet side of said intermediate laminate using therebetween an ordinary adhesive which does not require to be heated to a temperature not lower than the melting point of said specific polyolefin type resin at the time of lamination, thereby to obtain a final laminate.
Claim 3
Dependent Claim
48 words
A process for preparing a final laminate according to claim 1, wherein the specific polyolefin type resin is one prepared by graft copolymerizing a polyolefin and an α,β-ethylenically unsaturated carboxylic acid to produce a graft copolymer and then adding a metal compound to the thus produced graft copolymer.
Claim 4
Dependent Claim
18 words
A process for preparing a final laminate according to claim 2, wherein the polyolefin is a crystalline polyolefin.
Claim 5
Dependent Claim
42 words
A process for preparing a final laminate according to claim 2 or 3, wherein the specific polyolefin type resin is such a purified one that the unreacted α,β-ethylenically unsaturated carboxylic acid and low-molecular-weight polymers are substantially not detected therefrom by liquid chromatography.
Claim 6
Dependent Claim
24 words
A process for preparing a final laminate according to claim 4, wherein the purification is effected by washing with an organic solvent and/or water.
Claim 7
Dependent Claim
43 words
A process for preparing a final laminate according to any one of claims 1, 2, or 3, wherein the specific polyolefin type resin contains 100 parts by weight of the carboxyl group-containing polyolefin resin and 0.05-10 parts by weight of the metal compound.
Claim 8
Dependent Claim
37 words
A process for preparing a final laminate according to claim 4, wherein the specific polyolefin type resin contains 100 parts by weight of the carboxyl group-containing polyolefin resin and 0.05-10 parts by weight of the metal compound.
Claim 9
Dependent Claim
19 words
A process for preparing a final laminate according to claim 6, wherein the metal compound is an aluminum compound.
Claim 10
Dependent Claim
19 words
A process for preparing a final laminate according to claim 7, wherein the metal compound is an aluminum compound.
Claim 11
Dependent Claim
27 words
A process for preparing a final laminate according to claim 8, wherein the α,β-ethylenically unsaturated carboxylic acid is maleic anhydride and the aluminum compound is aluminum hydroxide.
Claim 12
Dependent Claim
29 words
A process for preparing a final laminate according to any one of claims 1-3, wherein the thermoplastic resin sheet or film is a polyolefin or polyamide sheet or film.
Claim 13
Dependent Claim
46 words
A process for preparing a final laminate according to any one of claims 1-3, wherein the heating to a temperature not lower than the melting point of the specific polyolefin type resin is effected by contacting a heating roll with the metal foil or sheet side.
Claim 14
Dependent Claim
46 words
A process for preparing a final laminate according to any one of claims 1 or 3, wherein the specific polyolefin type resin is melt extruded in film form between the thermoplastic resin sheet or film and the metal foil or sheet for carrying out sandwich lamination.
Claim 15
Dependent Claim
41 words
A process for preparing a final laminate according to claim 12, wherein the specific polyolefin type resin is melt extruded in film form between the thermoplastic resin sheet or film and the metal foil or film for carrying out sandwich lamination.
Claim 16
Dependent Claim
45 words
A process for preparing a final laminate according to any one of claims 1 or 3, wherein the thermoplastic resin sheet or film is a polyolefin, polyester, linear polyamide, ethylene-vinyl acetate copolymer, polybutadiene, polyvinyl chloride, polyvinylidene chloride or polycarbonate sheet or film, or is paper.
Claim 17
Dependent Claim
30 words
A process for preparing a final laminate according to claim 15, wherein the thermoplastic resin sheet or film is one having an ink layer printed on the inner surface thereof.
Claim 18
Dependent Claim
33 words
A process for preparing a final laminate according to claim 15, wherein the ordinary adhesive is at least one member selected from the group consisting of urethane type adhesives and epoxy type adhesives.
Claim 19
Dependent Claim
26 words
A process for preparing a final laminate according to claim 17, wherein the ordinary adhesive is in the form of a solution in an organic solvent.
Claim 20
Dependent Claim
38 words
A container for packaging foodstuffs, manufactured from the final laminate prepared by the process of any one of claims 1, 2 or 3, wherein the innermost thermoplastic resin sheet or film is a polyolefin resin sheet or film.
Claim 21
Dependent Claim
30 words
A process for preparing a final laminate according to claim 15, wherein the thermoplastic resin sheet or film is one having an ink layer printed on the outer surface thereof.
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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |