Method of preparing soluble aromatic polyimides and varnish comp

Details Method of preparing soluble aromatic polyimides and varnish comp Method of preparing soluble aromatic polyimides and varnish comp

1989-08-08

1990-10-23

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528128, C08G 802, C08G 6926

Patent

active

049653393

ABSTRACT:
Aromatic polyimides having a repeating unit represented by the general formula (1) are prepared by cyclization reaction of corresponding polyamic acids in an organic solvent in the presence of a lower monocarboxylic acid anhydride and a tertiary amine, e.g. triethylamine. The polyimides obtained by this method have high solubilities in various organic polar solvents and are soluble also in some organic nonpolar solvents. A solution of a polyimide prepared by this method in an organic solvent provides a varnish composition useful for wide purposes. ##STR1## wherein Rf is a perfluoroalkyl group, R is a tetravalent organic group, and each -N.dbd. is at the meta- or para-position with respect to the aromatic ether bond --O--.

REFERENCES:
patent: 4203922 (1980-05-01), Jones et al.

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