Method of preparing polyimides

Details Method of preparing polyimides Method of preparing polyimides

C - Chemistry, Metallurgy

08

G

402/220

C08G 73/10 (2006.01)

Patent

CA 1043940

METHOD OF PREPARING POLYIMIDES Abstract of the Disclosure A method of preparing polyimides which comprises, accor- ding to the present invention, polycondensation of diamines and dianhydrides of tetracarboxylic acids in the presence of a catalyst, viz. a carboxylic acid such as acetic, benzoic, a tetracarboxylic acid taken in an amount of from 0.25 to 10, preferably from 0.8 to 2.5 COOH groups per one unit of a polyimide in a polar organic solvent medium which is inert in respect of the starting diamines and dianhydrides and immiscible with water at a temperature within the range of from 100 to 220°C.

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