IMIDE-BENZOXAZOLE POLYCONDENSATE AND PROCESS FOR PRODUCING THE SAME

摘要

A polyimide type polycondensate which, when applied to a copper foil and then heated, gives a useful insulating film which does not warp the copper foil. The polycondensate is a solvent-soluble polycondensate which comprises benzoxazole units having a carboxyl group and imide units having a phenolic hydroxyl group, and is obtained by heating one or more tetracarboxylic dianhydrides together with one or more aromatic diamines having an amino group and a phenolic hydroxyl group ortho to the amine group to 150 to 220 DEG C in the presence of an acid catalyst to conduct dehydrating condensation.