High molecular weight polybenzimidazole preparation with phospho

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

1982-05-24

1983-11-08

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528179, 528183, 528207, 528208, 528211, 528220, 528313, 528321, 528331, 528337, 528342, C08G 7318

Patent

active

044143834

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: Re26065 (1966-07-01), Marvel et al.
patent: 3313783 (1967-04-01), Iwakura et al.
patent: 3509108 (1970-04-01), Prince
patent: 4312976 (1982-01-01), Choe

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