Process for manufacturing sintered polybenzimidazole article

Details Process for manufacturing sintered polybenzimidazole article Process for manufacturing sintered polybenzimidazole article

1997-06-13

1998-06-23

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264126, 528331, 528342, 528481, 528502, C08G 3302, B27J 500, C08J 500

Patent

active

057701423

ABSTRACT:
Provided is a process for manufacturing sintered polybenzimidazole (PBI) articles at high yields, said articles having neither voids nor porous, low-strength parts resulting from oxidative deterioration. To produce said sintered PBI articles from a particulate PBI resin, said PBI resin is compacted in a closed mold, the mold is heated up to a predetermined temperature of from 350.degree. to 600.degree. C. without applying any external pressure thereto, then, after having heated up to said predetermined temperature, the mold is pressed to have a predetermined external pressure of from 140 to 1400 kg/cm2 at said predetermined temperature whereby the resin is sintered for from 60 to 350 minutes under that conditions, and finally the sintered PBI article is cooled and taken out of the mold.

REFERENCES:
patent: 3340325 (1967-09-01), Suffredini
patent: 4263245 (1981-04-01), Tan
patent: 4814530 (1989-03-01), Ward

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