Process for preparing polyimides

Details Process for preparing polyimides Process for preparing polyimides

1986-12-31

1989-05-30

Kight, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528126, 528128, 528173, 528179, 528352, 528376, 528377, C08G 6926

Patent

active

048352497

ABSTRACT:
A process for making certain polyimides involves dissolving substantially equimolar amounts of an aromatic dianhydride and an organic diamine in a high-boiling, aprotic solvent, heating the reaction solution to form an insoluble polyimide prepolymer and to distill out water of reaction, separating the solid polyimide prepolymer and melt polymerizing the polyimide prepolymer to form the desired polyimide.

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patent: 4443592 (1984-04-01), Schmidt et al.

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