Patent US4670510A successfully refreshed from Google Patents.
US4670510A
Expired / Lapsed
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Polyester type block copolymer composition
Assignee: Toyobo Co Ltd
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Filing: 1985-08-01
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Granted: 1987-06-02
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Expires: 2005-08-01
Abstract
Abstract An improved polyester type block copolymer composition having a rubber-like elasticity, particularly having excellent moldability, which comprises a polyester type block copolymer produced from a crystalline aromatic polyester and a lactone in melt-admixture with a carboxylic acid compound selected from an ethylene-carboxylic acid copolymer and an aliphatic carboxylic acid metal salt.
Inventors
- 👤 Takuma Kobayashi
- 👤 Hironobu Kitagawa
- 👤 Shigeo Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:14
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08L; C08L67/00; C08L67/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
85 words
A polyester block copolymer composition which comprises a polyester block copolymer obtained by reacting a polytetramethylene terephthalate and a monomeric lactone in the ratio of 97/3 to 5/95 by weight in melt-admixture with an ethylene-carboxylic acid copolymer in an amount of 10 to 30% by weight based on the weight of the polyester block copolymer composition, the acid groups in the ethylene-carboxylic acid copolymer being neutralized with metallic ion selected from the group consisting of alkali metal ions, alkaline earth metal ions and zinc ions.
Claim 2
Dependent Claim
85 words
A polyester block copolymer composition which comprises a polyester block copolymer obtained by reacting a polytetramethylene terephthalate and a monomeric lactone in the ratio of 97/3 to 5/95 by weight in melt-admixture with an ethylene-carboxylic acid copolymer in an amount of 10 to 30% by weight based on the weight of the polyester block copolymer composition, the acid groups in the ethylene-carboxylic acid copolymer being neutralized with metallic ion selected from the group consisting of alkali metal ions, alkaline earth metal ions and zinc ions.
Claim 3
Dependent Claim
38 words
A composition according to claim 1, wherein the ethylene-carboxylic acid copolymer is a random or block copolymer containing about 25 to 98.5% by weight of ethylene unit and about 1.5 to 30% by weight of carboxylic acid unit.
Claim 4
Dependent Claim
20 words
The composition of claim 1 wherein the weight ratio of polytetramethylene terephthalate and monomeric lactone ranges from 95/5 to 30/70.
Claim 5
Dependent Claim
11 words
The composition of claim 3 wherein said monomeric lactone is ε-caprolactone.
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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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |