Thermotropic liquid-crystalline aromatic copolymers

Details Thermotropic liquid-crystalline aromatic copolymers Thermotropic liquid-crystalline aromatic copolymers

1991-08-26

1992-10-13

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528176, 528190, 528194, 528271, 528272, C08G 6302, C08G 6318, C08G 6700

Patent

active

051552043

ABSTRACT:
Liquid-crystalline, completely aromatic copolyesters are disclosed, which are endowed with a heat stability not lower than 350.degree. C., and are constituted by a succession of repetitive units containing: ##STR1## wherein A and B, which can be either equal to, or different, from, each other, can be either --O-- or --CO-- and one of the following moieties: ##STR2## in which Ar can be 1,4-phenylene, 2-monosubstituted-1,4-phenylene or 4,4'-diphenylene.
Also copolyesters also containing amidic bonding groups are disclosed.

REFERENCES:
patent: 4473682 (1984-09-01), Calundann et al.
"Prop. of Aromatic Copolyesters . . . " Macromolecules 1989, vol. 22(1) pp. 93-99.
Chemical Abstract 110:58196z "Prop. of Aromatic Copolyesters . . . ".
Polymer Journal, vol. 20, No. 7, 1988, pp. 529-537, Society of Polymer Science, Tokyo, JP.
Chemical Abstracts, vol. 58, No. 9, Apr. 29, 1963, column 9239b, Columbus, Ohio, US; M. A. Iskenderov et al.: "Heterochain polyesters".

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