Low birefringence polyarylate from polyarylene dicarboxylic acid

Details Low birefringence polyarylate from polyarylene dicarboxylic acid Low birefringence polyarylate from polyarylene dicarboxylic acid

1990-04-25

1991-08-27

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528176, 528191, 528125, 528174, 528193, C08G 6302, C08G 6300, C08G 6318, C08G 802

Patent

active

050434136

ABSTRACT:
An organic polyarylate containing a repeating unit represented by the formula; ##STR1## wherein X is at least one member selected from the group consisting of --O--, --S--, --SO.sub.2 --, --CO--, alkylene, alkenylene and following formulas; ##STR2## and R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, and R.sub.7 respectively show a hydrogen atom, a halogen atom or a C.sub.1 -C.sub.10 alkyl group; said polyarylates having an inherent viscosity of at least 0.2 dl/g measured at 25.degree. C. in a solution of 1 g of the polarylate in 100 ml of a mixture of 50% by weight of phenol and 50% by weight of 1,1,2,2-tetrachloroethane.

REFERENCES:
patent: 3284405 (1986-11-01), Coran

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