US4075262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyesters capable of forming an anisotropic melt
Assignee: EIDP Inc
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Filing: 1976-12-21
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Granted: 1978-02-21
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Expires: 1996-12-21
Abstract
Abstract This invention relates to a class of novel fiberforming, melt spinnable copolyesters capable of forming an anisotropic melt, said copolyester consisting essentially of units of the formula ##STR1## wherein units II and III are present in substantially equimolar amounts; Ar is selected from the group of chloro-, methyl-, 2,6-dichloro-, 2,6-dimethyl-1,4-phenylene or chloro-4,4'-biphenylene radicals; the copolyester containing from 15-70% by weight of unit I, and to the fibers and other shaped articles prepared therefrom. Also comprehended by this invention are the novel, optically anisotropic polyester melts from which these shaped articles can be prepared.
Inventors
- 👤 John Raymond Schaefgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:02
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/78; D01F6/84; C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
55 words
A fiber-forming melt spinnable copolyester capable of forming an anisotropic melt and consisting essentially of units of the formula: ##STR3## wherein units II and III are present in substantially equimolar amounts; Ar is selected from the group of chloro-, methyl-, 2,6-dichloro-, 2,6-dimethyl-1,4-phenylene, or chloro-4,4'-biphenylene radicals; the copolyester containing from 15-70% by weight of unit I.
Claim 2
Dependent Claim
55 words
A fiber-forming melt spinnable copolyester capable of forming an anisotropic melt and consisting essentially of units of the formula: ##STR3## wherein units II and III are present in substantially equimolar amounts; Ar is selected from the group of chloro-, methyl-, 2,6-dichloro-, 2,6-dimethyl-1,4-phenylene, or chloro-4,4'-biphenylene radicals; the copolyester containing from 15-70% by weight of unit I.
Claim 3
Dependent Claim
11 words
The polymer of claim 1 wherein Ar is a chloro-1,4-phenylene radical.
Claim 4
Dependent Claim
11 words
The polymer of claim 1 wherein Ar is a 2,6-dichloro-1,4-phenylene radical.
Claim 5
Dependent Claim
11 words
The polymer of claim 1 wherein Ar is a methyl-1,4-phenylene radical.
Claim 6
Dependent Claim
11 words
The polymer of claim 1 wherein Ar is a chloro-4,4'-biphenylene radical.
Claim 7
Dependent Claim
9 words
An anisotropic melt of the polymer of claim 1.
Claim 8
Dependent Claim
9 words
A shaped article of the polymer of claim 1.
Claim 9
Dependent Claim
8 words
A fiber of the polymer of claim 1.
Claim 10
Dependent Claim
10 words
An injection molded bar of the polymer of claim 1.
Claim 11
Dependent Claim
35 words
An as-spun fiber of the polymer of claim 1 having a tenacity of at least 1 gpd., an initial modulus in excess of 150 gpd., and an X-ray orientation angle of less than about 35°.
References Cited (Backward Citations)
US3037960A
Cited
US3160603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |