US4156070A
Expired / Lapsed
US
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Liquid crystal copolyesters prepared from an aromatic dicarboxylic acid, a substituted hydroquinone and resorcinol
Assignee: Eastman Chemical Co
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Filing: 1977-08-08
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Granted: 1979-05-22
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Expires: 1997-08-08
Abstract
Abstract Disclosed are liquid crystal copolyesters prepared from an aromatic dicarboxylic acid, a substituted hydroquinone and resorcinol. These copolyesters contain the following divalent radicals: ##STR1##
Inventors
- 👤 Winston J. Jackson, Jr.
- 👤 John C. Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:19
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/68; C08G63/682; C08G63/6824
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
A copolyester having an inherent viscosity of at least 0.4 measured at 25° C. using 0.50 gram of polymer per 100 ml. of a solvent composed of 60 volumes of phenol and 40 volumes of tetrachloroethane, the copolyester consisting essentially of the following divalent radicals: ##STR9## wherein X is Cl--, Br-- or a monovalent alkyl radical having one to three carbon atoms and n is 0, 1 or 2, in radical (B) Y is Cl--, Br-- or a monovalent alkyl radical having one to three carbon atoms and p is 1 or 2, and the range of radical (C) is from 20 to 65 mole percent, based on the total moles of radical (B) and radical (C) combined.
Claim 2
Dependent Claim
118 words
A copolyester having an inherent viscosity of at least 0.4 measured at 25° C. using 0.50 gram of polymer per 100 ml. of a solvent composed of 60 volumes of phenol and 40 volumes of tetrachloroethane, the copolyester consisting essentially of the following divalent radicals: ##STR9## wherein X is Cl--, Br-- or a monovalent alkyl radical having one to three carbon atoms and n is 0, 1 or 2, in radical (B) Y is Cl--, Br-- or a monovalent alkyl radical having one to three carbon atoms and p is 1 or 2, and the range of radical (C) is from 20 to 65 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 (A) is ##STR10##
Claim 4
Dependent Claim
17 words
The copolyester of claim 2 wherein the range of radical (C) is 30 to 50 mole percent.
Claim 5
Dependent Claim
70 words
A copolyester having an inherent viscosity of at least 0.6 measured at 25° C. using 0.50 gram of polymer per 100 ml. of a solvent composed of 60 volumes of phenol and 40 volumes of tetrachloroethane, the copolyester containing essentially of the following divalent radicals; ##STR11## wherein the amount of radical (C) is 30 to 50 mole percent, based on the total moles of radical (B) and radical (C) combined.
Claim 6
Dependent Claim
70 words
A copolyester having an inherent viscosity of at least 0.6 measured at 25° C. using 0.50 gram of polymer per 100 ml. of a solvent composed of 60 volumes of phenol and 40 volumes of tetrachloroethane, the copolyester containing essentially of the following divalent radicals; ##STR11## wherein the amount of radical (C) is 30 to 50 mole percent, based on the total moles of radical (B) and radical (C) combined.
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) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |