6,6-POLYIMIDE COPOLYMER AND PROCESS FOR PRODUCING THE SAME

摘要

It is intended to provide a process for producing a polyimide copolymer which is soluble in a solvent synthesized by 6,6-imide segment being an imide oligomer having pyromellitic dianhydride (PMDA) at both ends produced by adding 4 molar equivalents of PMDA and 2 molar equivalents of diaminotoluene (DAT) to an imide oligomer produced by heating 1 molar equivalent of biphenyl tetracarboxylic dianhydride (BPDA) and 2 molar equivalents of diaminodiphenyl ether (DADE) to 160 to 200°C in an organic polar solvent in the presence of a catalyst.