Process for preparing polyimide solution

Details Process for preparing polyimide solution Process for preparing polyimide solution

1979-11-08

1981-09-22

Michl, Paul R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

528183, 528353, C08K 513

Patent

active

042909368

ABSTRACT:
A polyimide solution is prepared by a process wherein a tetracarboxylic acid ingredient containing at least about 80% by mole of 3,3',4,4'-biphenyltetracarboxylic acid or its functional derivative and an aromatic diamine ingredient containing at least about 50% by mole of 4,4'-diaminodiphenyl ether are polymerized at from about 100.degree. to 300.degree. C. in phenol or a halogenated phenolic compound; the amount of the acid and diamine ingredients being approximately equimolar to each other; whereby polymerization of the tetracarboxylic acid ingredient and the aromatic diamine ingredient is effected while being accompanied by imidation. Preferably, the polymerization accompanied by imidation is effected in a manner such that at least a second half of the polymerization is carried out in a closed reaction system. The resulting polyimide solution is suitable for making therefrom shaped articles, such as films, possessing excellent mechanical properties.

REFERENCES:
patent: 3179630 (1965-04-01), Endrey
patent: 3933745 (1976-01-01), Bargain
patent: 4075171 (1978-02-01), D'Alelio

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