Dinitrobenzophenone solution and process for preparing an ether solution of diaminobenzophenones therefrom

Abstract From the Canadian patent

Abstract of the Disclosure 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 …