Method of preparing polyimides

Details Method of preparing polyimides Method of preparing polyimides

1974-12-23

1976-10-26

Phynes, Lucille M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 65, 260 47R, 260 338R, 260 312R, 260 318R, C08G 7316

Patent

active

039883035

ABSTRACT:
A method of preparing polyimides by 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 with respect to the starting diamines and dianhydrides and immiscible with water at a temperature within the range of from 100.degree. to 220.degree. C.

REFERENCES:
patent: 3526610 (1970-09-01), Bower
patent: 3634325 (1972-01-01), Di Leone et al.
patent: 3705875 (1972-12-01), Browning
patent: 3732189 (1973-05-01), Crivello et al.
patent: 3865841 (1975-02-01), Sicree et al.

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