High molecular weight polybenzimidazole preparation with phospho

Details High molecular weight polybenzimidazole preparation with phospho High molecular weight polybenzimidazole preparation with phospho

1983-06-21

1984-06-05

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528208, 528313, 528331, C08G 7318

Patent

active

044529678

ABSTRACT:
This invention provides a single stage melt polymerization process for the production of 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.

REFERENCES:
patent: 4312976 (1982-01-01), Choe
patent: 4394500 (1983-07-01), Milford

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