US4576995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated article and production thereof
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1984-07-19
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Granted: 1986-03-18
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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
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:26
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; C; C09; C09J; C09J4/00; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/302; B32B27/306; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967
Claims Analysis
Total Claims: 6
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 styrene and an α,β-unsaturated dicarboxylic acid or anhydride thereof 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 styrene and an α,β-unsaturated dicarboxylic acid or anhydride thereof 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
17 words
An adhesive according to claim 1, wherein the anhydride of the α,β-unsaturated dicarboxylic acid is maleic anhydride.
Claim 5
Dependent Claim
61 words
An adhesive according to claim 1, wherein the amount of the α,β-unsaturated dicarboxylic acid or anhydride thereof to be used is such that the ratio of the α,β-unsaturated dicarboxylic acid or anhydride thereof to a modified copolymer obtained by graft-copolymerizing the styrene and the α,β-unsaturated dicarboxylic acid or anhydride thereof to an ethylene/vinyl acetate copolymer is 0.05 to 10 weight %.
Claim 6
Dependent Claim
29 words
An adhesive according to claim 1, wherein styrene is employed in the proportion of about 0.8 to 1.2 moles per mole of the α,β-unsaturated dicarboxylic acid or anhydride 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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |