Two stage high molecular weight polybenzimidazole production with phosphorus containing catalyst
US4506068A · kind A · utility
13Cited by
1References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1984 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Feb 2, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.