Two stage high molecular weight polybenzimidazole production wit

Details Two stage high molecular weight polybenzimidazole production wit Two stage high molecular weight polybenzimidazole production wit

1984-02-02

1985-03-19

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

045060681

ABSTRACT:
This invention provides a two stage melt polymerization process for the production of an improved type of high molecular weight polybenzimidazole, which involves the use of an arylphosphine or arylphosphite 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 0.9 dl/g, and a weight average molecular weight of at least about 140,000.

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

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