Two stage high molecular weight polybenzimidazole production with phosphorus containing catalyst
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United States of America Patent
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Jul 31, 1984
Grant Date -
N/A
app pub date -
Mar 21, 1983
filing date -
Mar 21, 1983
priority date (Note) -
Expired
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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.
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