US4066620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyester capable of forming anisotropic melt and shaped articles thereof
Assignee: EIDP Inc
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Filing: 1975-08-01
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Granted: 1978-01-03
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Expires: 1995-08-01
Abstract
Abstract This invention relates to a class of novel copolyesters derived from terephthalic acid and derivatives of methyl- or chlorohydroquinone and bis(4-hydroxyphenyl)ether, and to the fibers and other shaped articles prepared therefrom. Also comprehended by this invention are the novel, optically anisotropic copolyester melts from which these fibers can be prepared.
Inventors
- 👤 Jacob John Kleinschuster
- 👤 Terry Carl Pletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:39
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6824; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/193; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
63 words
A fiber-forming melt-spinnable copolyester capable of forming an anisotropic melt consisting essentially of units of the formula: ##STR2## wherein X is selected from the group of chloro and methyl; m is 1 or 2; Y is methyl; n is 0 or 1; the mol ratio of formula I units to formula II units is within the range of from about 85/15 to 60/40.
Claim 2
Dependent Claim
63 words
A fiber-forming melt-spinnable copolyester capable of forming an anisotropic melt consisting essentially of units of the formula: ##STR2## wherein X is selected from the group of chloro and methyl; m is 1 or 2; Y is methyl; n is 0 or 1; the mol ratio of formula I units to formula II units is within the range of from about 85/15 to 60/40.
Claim 3
Dependent Claim
8 words
Copoly[chloro-1,4-phenylene/oxybis(1,4-phenylene) terephthalate](85/15 to 60/40) according to claim 1.
Claim 4
Dependent Claim
9 words
Copoly[methyl-1,4-phenylene/oxybis(1,4-phenylene) terephthalate] (85/15 to 60/40) according to claim 1.
Claim 5
Dependent Claim
9 words
Copoly[methyl-1,4-phenylene/oxybis(1,4-phenylene) 2,6-naphthalate] (85/15 to 60/40) according to claim 1.
Claim 6
Dependent Claim
9 words
Copoly[methyl-1,4-phenylene/oxybis(methyl-1,4-phenylene) 2,6-naphthalate] (85/15 to 60/40) according to claim 1.
Claim 7
Dependent Claim
9 words
An anisotropic melt of the polyester of claim 1.
Claim 8
Dependent Claim
8 words
A fiber of the polyester of claim 1.
Claim 9
Dependent Claim
8 words
A fiber of the polyester of claim 2.
Claim 10
Dependent Claim
8 words
A fiber of the polyester of claim 3.
Claim 11
Dependent Claim
8 words
A fiber of the polyester of claim 4.
Claim 12
Dependent Claim
8 words
A fiber of the polyester of claim 5.
Claim 13
Dependent Claim
9 words
A shaped article of the polyester of claim 1.
Claim 14
Dependent Claim
34 words
An as-spun fiber of the copolyester of claim 1 having a tenacity of at least 2 gpd., an initial modulus of at least 100 gpd. and an orientation angle of less than about 40°.
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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |