DINITROBENZOPHENONE SOLUTION AND PROCESS FOR PREPARING AN ETHER SOLUTION OF DIAMINOBENZOPHENONES THEREFROM

摘要

NOVEL DINITROBENZOPHENONE SOLUTION AND PROCESS FOR PREPARING AN ETHER SOLUTION OF DIAMINOBENZOPHENONES THEREFROM A novel ether solution of dinitrobenzophenone and a process for preparing an ether solution of diaminobenzophenone therefrom which comprises subjecting a dinitrobenzophenone dissolved in said ether solvent to hydrogenation in contact with a continuous nickel catalyst to obtain said solution of diaminobenzophenone dissolved in said ether solvent. In a specific embodiment said nickel catalyst is mounted on an inert support. In a still further embodiment, said diaminobenzophenone dissolved in said ether solvent, after removal of water therefrom, is reacted with an aromatic dianhydride to obtain a polyamic acid solution. The polyamic acid solution can be heated at a temperature above 100.degree.C. to drive off water of cyclization and thereby obtain the corresponding polyimide resin.