Process for preparing polyetheramide-acids

Claim 1

A process for preparing oligomeric polyetheramide-acid, comprising reacting an aromatic dianhydride component selected from the group consisting of (a) aromatic bis(ether anhydride)s of the general formula ##STR9## and (b) mixtures of one or more of said bis(ether anhydride)s with up to 30 mole percent benzophenone dianhydride of the general formula ##STR10## with at least one organic diamine of the general formula H.sub.2 N--R--NH.sub.2 (III) in an inert organic liquid selected from the group consisting of (c) chlorinated hydrocarbon selected from the group consisting of methylene chloride, chloroform, 1,2-dichloroethane, and mixtures thereof and (d) mixtures of said chlorinated hydrocarbon with up to 50% by weight of acetone to form oligomeric polyetheramide-acid which is substantially insoluble in said liquid, where Z is a member selected from the class consisting of (a) divalent organic radicals having the following formulas ##STR11## and (b) divalent organic radicals of the general formula ##STR12## where X is a member selected from the class consisting of divalent radicals of the formulas ##STR13## where y is an integer from 1 to 5; and R is a divalent organic radical selected from the class consisting of aromatic hydrocarbon radicals having from 6 to about 20 carbon atoms and halogenated derivatives thereof, alkylene radicals having from 2 to about 20 carbon atoms, cycloalkylene radicals having from 3 to about 20 carbon atoms, from C 2 to about C 8 alkylene terminated polydiorganosiloxane and divalent radicals of the general formula ##STR14## where Q is a member selected from the class consisting of --O--, --S--, and --C x H 2x --, and x is an integer from 1 to 5.