US4153779A
Expired / Lapsed
US
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Liquid crystal copolyester containing a substituted phenylhydroquinone
Assignee: Eastman Chemical Co
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Filing: 1978-06-26
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Granted: 1979-05-08
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Expires: 1998-06-26
Abstract
Abstract Disclosed is a liquid crystal copolyester having unobviously high mechanical properties. The copolyester is prepared from an aromatic dicarboxylic acid, a substituted phenylhydroquinone and optionally other hydroquinones.
Inventors
- 👤 Winston J. Jackson, Jr.
- 👤 Gary G. Gebeau
- 👤 Herbert F. Kuhfuss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:25
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
A copolyester having a fiber-forming molecular weight consisting essentially of the following divalent radicals ##STR4## R 2 is Cl--, Br-- or a monovalent alkyl radical having one to four carbon atoms, n is 1, 2 or 3, ##STR5## where Y is Cl--, Br-- or a monovalent alkyl radical having one to three carbon atoms, the range of radical (C) is 0 to 40 mole percent, based on the total moles of radical (B) and radical (C) combined.
Claim 2
Dependent Claim
77 words
A copolyester having a fiber-forming molecular weight consisting essentially of the following divalent radicals ##STR4## R 2 is Cl--, Br-- or a monovalent alkyl radical having one to four carbon atoms, n is 1, 2 or 3, ##STR5## where Y is Cl--, Br-- or a monovalent alkyl radical having one to three carbon atoms, the range of radical (C) is 0 to 40 mole percent, based on the total moles of radical (B) and radical (C) combined.
Claim 3
Dependent Claim
10 words
The copolyester of claim 1 wherein radical (C) is ##STR6##
Claim 4
Dependent Claim
15 words
A polyester having a fiber-forming molecular weight consisting essentially of the following divalent radicals ##STR7##
Claim 5
Dependent Claim
15 words
A polyester having a fiber-forming molecular weight consisting essentially of the following divalent radicals ##STR7##
References Cited (Backward Citations)
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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) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |