Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1989-07-13
1991-03-26
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528183, 528186, 528339, 528342, 528348, 528349, C08G 7532
Patent
active
050030353
ABSTRACT:
There are provided para-ordered aromatic heterocyclic copolymers having repeating groups of the following formulas: ##STR1## wherein a, b, c, d, and e are positive integers, each representing an average number of the respective different recurring units present in the repeating group, m and n are 1 or 2, R and R' are alkyl groups having 1 to 4 carbon atoms, and Q is a benzobisazole group of the formula: ##STR2## wherein Y is --O--, --S--, or --NH--. In the copolymers wherein m or n is 2, the R or R' groups can be the same or different. In copolymer I, the ratio a:b can be about 1:1 to 99:1. In copolymer II, the ratio c:(d+e) can be about 1:1 to 99:1, and the ratio d:e can be aobut 1:99 to 99:1.
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Arnold Fred E.
Tsai Tsu-Tzu
Anderson Harold D.
Bricker Charles E.
Singer Donald J.
The United States of America as represented by the Secretary of
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