Process for the production of polybenzimidazole foams

Details Process for the production of polybenzimidazole foams Process for the production of polybenzimidazole foams

1985-10-24

1986-07-01

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 54, 26433116, 264DIG5, 521 89, 521 92, 521184, 521185, C08J 902

Patent

active

045980993

ABSTRACT:
The present invention is a process for the preparation of novel polybenzimidazole foams. The foams exhibit a closed cellular structure and are prepared by forming a polybenzimidazole solution, adding sulfuric acid to the polybenzimidazole solution, removing the solvent, and heat treating the polybenzimidazole at a temperature of about 350.degree. to 600.degree. C.

REFERENCES:
patent: 4092274 (1978-05-01), Fletcher
patent: 4448687 (1984-05-01), Wang

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