Process of preparing polyimides from dianhydride and diisocyanat

Details Process of preparing polyimides from dianhydride and diisocyanat Process of preparing polyimides from dianhydride and diisocyanat

1990-06-29

1992-07-21

Welsh, Maurice J.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 73, C08G 1822

Patent

active

051323885

ABSTRACT:
In preparing polyimides by heating a solution of intramolecular tetracarboxylic acid dianhydrides and organic diisocyanates in an aprotic organic solvent in the presence of a polymerization accelerator, a catalytic amount of an alkali metal hydroxide is used as the polymerization accelerator. By this process, polyimides having high molecular weights are produced in a simple manner. The polyimides produced exhibit a high-temperature resistance.

REFERENCES:
patent: 3701756 (1972-10-01), Carleton et al.
patent: 4001186 (1977-01-01), Onder
patent: 4021412 (1977-05-01), Onder
patent: 4156065 (1979-05-01), Onder et al.

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