US3887649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moldings made of hydrolyzed ethylene-vinyl acetate copolymer
Assignee: Mitsubishi Chemical Corp
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Filing: 1974-07-18
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Granted: 1975-06-03
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Expires: 1994-07-18
Abstract
Abstract Impact resistance of moldings made of hydrolyzed ethylene-vinyl acetate copolymer, containing 20 to 50 % by mole of ethylene and 80 to 50 % by mole of vinyl acetate and having degree of hydrolysis of at least 90 % by mole, is improved by incorporating a block-copolymerized polyester-polyether elastomer, having melting point of crystalline region of 150* to 230*C. and impact resilience of not less than 50 %, in the ratio of 2 to 100 parts by weight per 100 parts by weight of the copolymer.
Inventors
- 👤 Hiroshi Takida
- 👤 Yoshimi Akamatu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:03
CPC Classifications
C; C08; C08L; C08L31/00; C08L31/02; C08L31/04; C08L29/00; C08L29/02; C08L29/04; C08L67/00; C08L67/02; C08L67/025; C08L71/00; C08L71/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
A MOLDING HAVING AN IMPROVED IMPACT-RESISTANCE WHICH COMPRISES A HYDROLYZED ETHYLENE-VINYL ACETATE COPOLYMER AND 2 TO 100 PARTS BY WEIGHT OF A BLOCK-COPOLYMERIZED POLYESTERPOLYETHER ELASTOMER PER 100 PARTS BY WEIGHT OF SAID COPOLYMER; SAID HYDROLYZED ETHYLENE-VINYL ACETATE COPOLYMER HAVING AN ETHYLENE CONTENTS OF 20 TO 50% BY MOLE, A VINYL ACETATE CONTENT OF 80 TO 50% BY MOLE AND A DEGREE OF HYDRROLYSIS IN VINYL ACETATE COMPONENT OF NOT LESS THAN 90% BY MOLE, AND SAID BLOCK-COPOLYMERIZED POLYESTER-POLYETHER ELASTOMER HAVING A MELTING POINT OF CRYSTALLINE REGION OF 150* TO230*C. AND AN IMPACT RESILIENCE OF NOT LESS THAN 50%.
Claim 2
Dependent Claim
98 words
A MOLDING HAVING AN IMPROVED IMPACT-RESISTANCE WHICH COMPRISES A HYDROLYZED ETHYLENE-VINYL ACETATE COPOLYMER AND 2 TO 100 PARTS BY WEIGHT OF A BLOCK-COPOLYMERIZED POLYESTERPOLYETHER ELASTOMER PER 100 PARTS BY WEIGHT OF SAID COPOLYMER; SAID HYDROLYZED ETHYLENE-VINYL ACETATE COPOLYMER HAVING AN ETHYLENE CONTENTS OF 20 TO 50% BY MOLE, A VINYL ACETATE CONTENT OF 80 TO 50% BY MOLE AND A DEGREE OF HYDRROLYSIS IN VINYL ACETATE COMPONENT OF NOT LESS THAN 90% BY MOLE, AND SAID BLOCK-COPOLYMERIZED POLYESTER-POLYETHER ELASTOMER HAVING A MELTING POINT OF CRYSTALLINE REGION OF 150* TO230*C. AND AN IMPACT RESILIENCE OF NOT LESS THAN 50%.
Claim 3
Dependent Claim
99 words
A molding having an improved impact-resistance which comprises a hydrolyzed ethylene-vinyl acetate copolymer and 2 to 100 parts by weight of a block-copolymerized polyester-polyether elastomer per 100 parts by weight of said copolymer; said hydrolyzed ethylene-vinyl acetate copolymer having an ethylene content of 20 to 50% by mole, a vinyl acetate content of 80 to 50% by mole and a degree of hydrolysis in vinyl acetate component of not less than 90% by mole, and said block-copolymerized polyester-polyether elastomer having a melting point of crystalline region of 150* to 230*C. and an impact resilience of not less than 50%.
Claim 4
Dependent Claim
99 words
A molding having an improved impact-resistance which comprises a hydrolyzed ethylene-vinyl acetate copolymer and 2 to 100 parts by weight of a block-copolymerized polyester-polyether elastomer per 100 parts by weight of said copolymer; said hydrolyzed ethylene-vinyl acetate copolymer having an ethylene content of 20 to 50% by mole, a vinyl acetate content of 80 to 50% by mole and a degree of hydrolysis in vinyl acetate component of not less than 90% by mole, and said block-copolymerized polyester-polyether elastomer having a melting point of crystalline region of 150* to 230*C. and an impact resilience of not less than 50%.
Claim 5
Dependent Claim
53 words
The molding of claim 1, in which 0.5 to 10 parts by weight of Ethylene-vinyl acetate copolymer is further incorporated per 100 parts by weight of the hydrolyzed ethylene-vinyl acetate copolymer; said ethylene-vinyl acetate copolymer consisting of 60 to 90% by mole of ethylene and 40 to 10% by mole of vinyl acetate.
Claim 6
Dependent Claim
33 words
The molding of claim 1, wherein said block-copolymerized polyester-polyether elastomer is present in an amount of 5 to 50 parts by weight per 100 parts by weight of the hydrolyzed ethylene-vinyl acetate copolymer.
Claim 7
Dependent Claim
47 words
The molding of claim 1, wherein said hydrolyzed ethylene-vinyl acetate copolymer has an ethylene content of 25 to 40% by mole, a vinyl acetate content of 75 to 60% by mole and a degree of hydrolysis in vinyl acetate component of not less than 95% by mole.
References Cited (Backward Citations)
US2703794A
Cited
US3825620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |