US4146702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal copolyesters prepared from an aromatic dicarboxylic acid, a substituted hydroquinone and a m-acyloxybenzoic acid
Assignee: Eastman Chemical Co
•
Filing: 1977-08-08
•
Granted: 1979-03-27
•
Expires: 1997-08-08
Abstract
Abstract Disclosed are copolyesters prepared from an aromatic dicarboxylic acid, a diacyl ester of a substituted hydroquinone and a m-acyloxybenzoic acid. These copolyesters contain the following divalent radicals: ##STR1##
Inventors
- 👤 John C. Morris
- 👤 Winston J. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:45
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/02; C08G63/60; C08G63/605
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A copolyester having an inherent viscosity of at lease 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 consisting essentially of the following divalent radicals: ##STR18## 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 amount of radical (C) is from about 20 to about 45 mole percent, based on the total moles of (A) and (C) combined.
Claim 2
Dependent Claim
116 words
A copolyester having an inherent viscosity of at lease 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 consisting essentially of the following divalent radicals: ##STR18## 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 amount of radical (C) is from about 20 to about 45 mole percent, based on the total moles of (A) and (C) combined.
Claim 3
Dependent Claim
10 words
The copolyester of claim 1 wherein radical (A) is ##STR19##
Claim 4
Dependent Claim
18 words
The copolyester of claim 1 wherein radical (B) is ##STR20## wherein Y is Cl- or CH 3 -.
Claim 5
Dependent Claim
77 words
A cpolyester having an inherent viscosity of at lease 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 consisting essentially of the following divalent radicals: ##STR21## wherein Y is Cl- or CH 3 , and the amount of radical (C) is from 20 to 45 mole percent, based on the total moles of radical (A) and radical (C) combined.
Claim 6
Dependent Claim
77 words
A cpolyester having an inherent viscosity of at lease 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 consisting essentially of the following divalent radicals: ##STR21## wherein Y is Cl- or CH 3 , and the amount of radical (C) is from 20 to 45 mole percent, based on the total moles of radical (A) and radical (C) combined.
References Cited (Backward Citations)
US3773858A
Cited
US4035356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |