EP0133243A2
Expired / Lapsed
EP
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Laminated article and production thereof
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1984-07-19
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Granted: —
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Expires: 2004-07-19
Abstract
Abstract Disclosed is an adhesive for bonding an ethylene/vinyl alcohol copolymer and polystyrene, which comprises a modified ethylene/vinyl acetate copolymer obtained by graft-copolymerizing a styrenic vinyl monomer and an α,β-unsaturated carboxylic acid to an ethylene/vinyl acetate copolymer. A laminated article having the said adhesive as an interlayer and production thereof are also disclosed. The laminated article shows strong resistance to delamination and excels in processability. Therefore, the laminate is valuable as a deep-draw forming material with enhanced gas barrier properties for a preservation rigid container for foods.
Inventors
- 👤 Masamitsu Nakabayashi
- 👤 Yuzo Furukawa
- 👤 Akira Tashiro
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 06:50
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; B32B27/00; B32B27/06; B32B27/08; C; C09; C09J; C09J4/00; B32B27/30; B32B27/302; B32B27/306; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
35 words
An adhesive for bonding an ethylene/vinyl alcohol copolymer and polystyrene together, which comprises a modified ethylene/vinyl acetate copolymer obtained by graft-copolymerizing a styrenic vinyl monomer and an a,S-unsaturated carboxylic acid to an ethylene/vinyl acetate copolymer.
Claim 2
Dependent Claim
35 words
An adhesive for bonding an ethylene/vinyl alcohol copolymer and polystyrene together, which comprises a modified ethylene/vinyl acetate copolymer obtained by graft-copolymerizing a styrenic vinyl monomer and an a,S-unsaturated carboxylic acid to an ethylene/vinyl acetate copolymer.
Claim 3
Dependent Claim
38 words
An adhesive according to Claim 1, wherein the base copolymer for the modification is an ethylene/vinyl acetate copolymer containing 1 to 50 weight % of vinyl acetate and showing a melt index of 0.1 to 500 g/10 min.
Claim 4
Dependent Claim
26 words
An adhesive according to Claim 1, wherein the styrene vinyl monomer is styrene and the a,S-unsaturated carboxylic acid is an α,β-unsaturated dicarboxylic acid or anhydride thereof.
Claim 5
Dependent Claim
17 words
An adhesive according to Claim 3, wherein the anhydride of the a,8-unsaturated dicarboxylic acid is maleic anhydride.
Claim 6
Dependent Claim
54 words
An adhesive according to Claim 1, wherein the amount of the α,β-unsaturated carboxylic acid to be used is such that the ratio of the α,β-unsaturated carboxylic acid to a modified copolymer obtained by graft-copolymerizing the styrenic vinyl monomer and the α,β-unsaturated carboxylic acid to an ethylene/vinyl acetate copolymer is 0.05 to 10 weight %.
Claim 7
Dependent Claim
29 words
An adhesive according to Claim 1, wherein the styrenic vinyl monomer is employed in the proportion of about 0.8 to 1.2 moles per mole of the a,S-unsaturated carboxylic acid.
Claim 8
Dependent Claim
41 words
A laminated article which consists of an ethylene/ vinyl alcohol copolymer and polystyrene and has a modified ethylene/vinyl acetate copolymer obtained by graft-copolymerizing a styrenic vinyl monomer and an α,β-unsaturated carboxylic acid to an ethylene/vinyl acetate copolymer as its adhesive interlayer.
Claim 9
Dependent Claim
41 words
A laminated article which consists of an ethylene/ vinyl alcohol copolymer and polystyrene and has a modified ethylene/vinyl acetate copolymer obtained by graft-copolymerizing a styrenic vinyl monomer and an α,β-unsaturated carboxylic acid to an ethylene/vinyl acetate copolymer as its adhesive interlayer.
Claim 10
Dependent Claim
45 words
A laminated article according to Claim 7, wherein the ethylene/vinyl alcohol copolymer layer is a thickness of about 10 -200 µ, the polystyrene layer is a thickness of about 200 - 300 µ and the interlayer is a thickness of about 10 - 200 µ.
Claim 11
Dependent Claim
99 words
A process for producing a laminated article which comprises a) forming an ethylene/vinyl alcohol copolymer material and polystyrene material into a sheet, respectively and sandwiching between the sheets an adhesive which comprises a modified ethylene/vinyl acetate copolymer obtained by graft-copolymerizing a styrenic vinyl monomer and an α,β-unsaturated carboxylic acid to an ethylene/vinyl acetate copolymer, followed by heating and pressing, or b) co- extruding an ethylene/vinyl alcohol copolymer material and polystylene material together with an adhesive which comprises a modified ethylene/vinyl acetate copolymer obtained by graft-copolymerizing a styrenic vinyl monomer and an α,β-unsaturated carboxylic acid to an ethylene/vinyl acetate copolymer.
Claim 12
Dependent Claim
99 words
A process for producing a laminated article which comprises a) forming an ethylene/vinyl alcohol copolymer material and polystyrene material into a sheet, respectively and sandwiching between the sheets an adhesive which comprises a modified ethylene/vinyl acetate copolymer obtained by graft-copolymerizing a styrenic vinyl monomer and an α,β-unsaturated carboxylic acid to an ethylene/vinyl acetate copolymer, followed by heating and pressing, or b) co- extruding an ethylene/vinyl alcohol copolymer material and polystylene material together with an adhesive which comprises a modified ethylene/vinyl acetate copolymer obtained by graft-copolymerizing a styrenic vinyl monomer and an α,β-unsaturated carboxylic acid to an ethylene/vinyl acetate copolymer.
References Cited (Backward Citations)
No citation records indexed.
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