Tetrapolyimide film containing benzophenone tetracarboxylic dian

Details Tetrapolyimide film containing benzophenone tetracarboxylic dian Tetrapolyimide film containing benzophenone tetracarboxylic dian

1990-12-17

1993-03-23

Kight, III, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528126, 528128, 528170, 528172, 528173, 528176, 528179, 528184, 528185, 528188, 528220, 528229, 5283291, 528350, 528353, 525262, 525282, 525422, 525436, 524600, 4284735, C08C 802, C08C 6926, C08C 7310, C08F26510

Patent

active

051965003

ABSTRACT:
Tetrapolyimide films derived from 3,3',4,4'-benzophenone tetracarboxylic dianhydride, pyromellitic acid dianhydride, p-phenylene diamine and 4,4'-diaminodiphenyl ether, and their preparation, are described. The tetrapolymer films have low water absorption, low coefficients of thermal and hygroscopic expansion, high modulus and are caustic etachable and can be used in flexible printed circuit and tape automated bonding applications.

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CA 99(12):89229w.

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