High molecular weight polybenzimidazoles

Details High molecular weight polybenzimidazoles High molecular weight polybenzimidazoles

1983-06-21

1984-11-20

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528208, 528331, 528336, C08G 7318

Patent

active

044839774

ABSTRACT:
This invention provides an improved type of high molecular weight polybenzimidazole, which involves the use of a phosphorus-containing polymerization catalyst.
The process provides poly-2,2'-(m-phenylene)-5,5'-bibenzimidazole of improved color and plugging value, and is further characterized by an inherent viscosity of at least about 0.7 dl/g, and a weight average molecular weight of at least about 100,000.

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patent: 4312976 (1982-01-01), Choe

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