Thermotropic copolymers of 4,4'-biphenyldicarboxylic acid

Details Thermotropic copolymers of 4,4'-biphenyldicarboxylic acid Thermotropic copolymers of 4,4'-biphenyldicarboxylic acid

1989-05-25

1991-08-06

Anderson, Harold D.

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 6300

Patent

active

050379380

ABSTRACT:
The invention relates to a class of polyesters and copolyesters which display optical anisotropy in the molten state and to the shaped articles, fibers and films obtained from the optically anisotropic melts. The copolyesters consisting essentially of recurring structural units (a) independently each occurrence selected from the group consisting essentially of Formula I; recurring structural units (b) independently each occurrence selected from the group consisting of Formulas II and III; recurring structural units (c) independently each occurrence selected from the group consisting of Formula IV and optionally recurring structural units (d) independently each occurrence selected from the group consisting of Formula V: ##STR1## wherein R independently each occurrence is selected from the group consisting of hydrogen, halo, lower alkyl, methoxy and phenyl; R' independently each occurrence is selected from the group consisting of hydrogen, halo, methoxy and phenyl; and R" comprises lower alkyl.

REFERENCES:
patent: 4337191 (1982-06-01), Favstritsky
patent: 4447593 (1984-05-01), Funakoshi et al.

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