Production of improved high molecular weight polybenzimidazole with tin containing catalyst
US4452971A · kind A · utility
18Cited by
1References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1982 |
| Grant date | Jun 5, 1984 |
| Priority date | — |
| Expiry date | Jul 19, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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 tin-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 0.5 dl/g, and a weight average molecular weight of at least about 100,000.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.