Patent ID: 6706346
Filing Date: 2004-03-16
Classification: B29C,B29K,C08G,Y10T

Abstract:
A process for production of polyimide molded bodies which comprises a step in which a polyimide resin powder obtained by polymerization and imidation of p-phenylenediamine with 3,3,4,4â€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 800-5,000 kgf/cm2, a step in which the pressurized body is subjected to calcination at about 450-550Â° C. under low pressure, a step in which the calcined molded body is vacuum encapsulated into a metal capsule, and a step in which the encapsulated molded body is isotropically subjected to hot compression at approximately 460-550Â° C. in an inert gas atmosphere such as argon.