High molecular weight polybenzimidazoles
US4483977A · kind A · utility
13Cited by
12References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1983 |
| Grant date | Nov 20, 1984 |
| Priority date | — |
| Expiry date | Jun 21, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention provides 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.