Favorably processable polyimide and process for preparing polyim

Details Favorably processable polyimide and process for preparing polyim Favorably processable polyimide and process for preparing polyim

1992-06-04

1994-01-04

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528128, 528172, 528173, 528176, 528185, 528188, 528220, 528229, 528352, C08G 6926, C08G 7310

Patent

active

052761339

ABSTRACT:
A favorably processable polyimide which has recurring structural units represented by the formula (I): ##STR1## wherein R is a tetravalent radical having from 2 to 27 carbon atoms and is selected from the group consisting of an aliphatic radical, alicyclic radical, monoaromatic radical, condensed polyaromatic radical and noncondensed aromatic radical connected to each other with a direct bond or a bridge member, and is blocked at the polymer chain end with aromatic dicarboxylic anhydride represented by the formula (II): ##STR2## wherein X is a divalent radical selected from the group consisting of a monoaromatic radical having from 6 to 27 carbon atoms, condensed polyaromatic radical and noncondensed aromatic radical connected to each other with a direct bond or a bridge member.

REFERENCES:
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patent: 4161492 (1979-07-01), Weissel
patent: 4925916 (1990-05-01), Harris
patent: 4970292 (1990-11-01), Bockroth
patent: 4994544 (1991-02-01), Nagahiro
patent: 4996293 (1991-02-01), Tsuyoshi
patent: 5032667 (1991-07-01), Harris

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