US4742151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra-high-molecular-weight polyesters
Assignee: Toyobo Co Ltd
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Filing: 1987-04-23
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Granted: 1988-05-03
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Expires: 2007-04-23
Abstract
Abstract A novel ultra-high-molecular-weight polyester prepared from aromatic dicarboxylic acid or alkyl ester thereof and alkylene glycol, and having intrinsic viscosity of not less than 1.5 and insoluble polymer content of not more than 10% by weight.
Inventors
- 👤 Susumu Tate
- 👤 Haruhiko Narusawa
- 👤 Youichi Watanabe
- 👤 Akira Chiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:09
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/185; C08G63/183
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
An ultra-high-molecular-weight polyester prepared from aromatic dicarboxylic acid or alkyl ester thereof and alkylene glycol, and having intrinsic viscosity of not less than 1.5 and insoluble polymer content of not more than 10% by weight, said insoluble polymer content being measured by dissolving 6 g of said polyester in 100 ml of the mixed solvent of trifluoroacetic acid/dichloroethane (1/1) at 25° C. with stirring at 150 to 200 r.p.m. for 6 hours, filtering an insoluble material with a glass filter having opening size of 20 to 30μ under reduced pressure, washing the insoluble material with chloroform, drying at 130° C. for 24 hours in vacuo, weighing the resulting insoluble material and calculating the weight % of the insoluble material based on 6 g of the polyester.
Claim 2
Dependent Claim
126 words
An ultra-high-molecular-weight polyester prepared from aromatic dicarboxylic acid or alkyl ester thereof and alkylene glycol, and having intrinsic viscosity of not less than 1.5 and insoluble polymer content of not more than 10% by weight, said insoluble polymer content being measured by dissolving 6 g of said polyester in 100 ml of the mixed solvent of trifluoroacetic acid/dichloroethane (1/1) at 25° C. with stirring at 150 to 200 r.p.m. for 6 hours, filtering an insoluble material with a glass filter having opening size of 20 to 30μ under reduced pressure, washing the insoluble material with chloroform, drying at 130° C. for 24 hours in vacuo, weighing the resulting insoluble material and calculating the weight % of the insoluble material based on 6 g of the polyester.
Claim 3
Dependent Claim
16 words
An ultra-high-molecular-weight polyester according to claim 1, which has intrinsic viscosity of not less than 2.0.
Claim 4
Dependent Claim
16 words
An ultra-high-molecular-weight polyester according to claim 1, which has intrinsic viscosity of not less than 2.5.
Claim 5
Dependent Claim
16 words
An ultra-high-molecular-weight polyester according to claim 1, which has intrinsic viscosity of not less than 3.0.
Claim 6
Dependent Claim
19 words
An ultra-high-molecular-weight polyester according to claim 1, which has insoluble polymer content of not more than 5.0% by weight.
Claim 7
Dependent Claim
14 words
An ultra-high-molecular-weight polyester according to claim 1, wherein aromatic dicarboxylic acid is terephthalic acid.
Claim 8
Dependent Claim
13 words
An ultra-high-molecular-weight polyester according to claim 1, wherein alkylene glycol is ethylene glycol.
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) | 1991-05-03 | 1991-11-02 | 1992-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-03 | 1995-11-02 | 1996-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-03 | 1999-11-02 | 2000-05-03 | $7700.00 | Window Closed / Lapsed |