Patent ID: 6555647
Filing Date: 2003-04-29
Classification: C08G,C08J

Abstract:
A process for production of polyimide molded bodies which compii~es a step in which a polyimide resin powder obtained by polymerization and imidation of p-phenylenediamine with 3,3â€²,4,4â€²-biphenyltetracarboxylic acid, its ester or its dianhydride and 2,3,3â€²,4â€²-biphenyltetracarboxylic acid, its ester or its dianhydride is molded at a pressure of approximately 3,000-5,000 kgf/cm2 and at from room temperature to 200Â° C., and a step in which it is calcined at about 460-550Â° C. at a low pressure of 0.5-10 atmospheres and under a nonreactive gas stream.