Polyimide

Details Polyimide Polyimide

1997-08-05

1998-11-03

Pezzuto, Helen L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528170, 428 1, 560 19, 560 50, C08G 7500, C09K 1900

Patent

active

058309764

ABSTRACT:
A polyamic acid is herein disclosed which contains a structural unit ##STR1## wherein m is an integer of 1 to 20; n is an integer of 1 to 2; and R.sup.2 is an alkyl group or an alkoxy group having 1 to 20 carbon atoms. Furthermore, a polyamic acid composition is also disclosed which comprises the polyamic acid containing the structural unit represented by the than mentioned above. By heating the polyamic acid or the polyamic acid composition at a low temperature for a short time, a liquid crystal alignment film can be obtained which comprises a polyimide or a polyimide composition.

REFERENCES:
patent: 4874834 (1989-10-01), Higashi et al.
patent: 4876330 (1989-10-01), Higashi et al.

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