Two stage melt production of high molecular weight polybenzimida

Details Two stage melt production of high molecular weight polybenzimida Two stage melt production of high molecular weight polybenzimida

1983-10-18

1984-11-27

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528206, 528208, 528313, 528331, C08G 7318

Patent

active

044852320

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: 4312976 (1982-01-01), Choe

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