Process for production of polyimide molded bodies and polyimide molded bodies
AssigneeUbe Industries, Ltd.
InventorTatsuo Tsumiyama
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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′,4,4′-biphenyltetracarboxylic acid, its ester or its dianhydride and 2,3,3′,4′-biphenyltetracarboxylic acid, its ester or its dianhydride is molded at a pressure of approximately 3,000-5,000 kgf/cm2, and a step in which it is calcined at about 460-550° C. under low pressure. The polyimide molded bodies obtained thereby have a density in the range of 1.28-1.34 g/cm3.
Claims16
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 3,3′,4,4′-biphenyltetracarboxylic acid, its ester or its dianhydride and 2,3,3′,4′-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 200° C., and a step in which it is calcined at about 460-550° C. at a low pressure of 0.5-10 atmospheres and under a nonreactive gas stream.
A polyimide molded body which is obtained by molding polyimide powder containing at least 70 mole percent of 3,3′,4,4′-biphenyltetracarboxylic acid dianhydride component and at least 70 mole percent of a phenylenediamine component, by a molding method involving the CIP method, and which has a flexural strength of approximately 85 Mpa or greater and a vacuum gas discharge property at 300° C. of about 10×10−6 Torr·l/sec·cm2 or less.
A process of production of polyimide molded bodies which comprises molding polyimide powder containing at least 70 mole percent of 3,3′,4,4′-biphenyltetracarboxylic acid dianhydride component and at least 70 mole percent of a phenylenediamine component, by a molding method involving the CIP method, wherein the resulting molded bodies have a flexural strength of approximately 85 Mpa or greater and a vacuum gas discharge property at 300° C. of about 10×106 Torr·l/sec·cm2 or less.
Dependencies are inferred from the claim text.