Production of high molecular weight polybenzimidazole with aryl

Details Production of high molecular weight polybenzimidazole with aryl Production of high molecular weight polybenzimidazole with aryl

1983-01-28

1984-06-05

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528342, C08G 7318

Patent

active

044529724

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 arylphosphinic acid or arylphosphonic acid 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: 3313783 (1967-04-01), Iwakura et al.
patent: 4312976 (1982-01-01), Choe

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