Preparation of polybenzimidazoles
US4002679A · kind A · utility
16Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 27, 1975 |
| Grant date | Jan 11, 1977 |
| Priority date | — |
| Expiry date | Mar 27, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing polybenzimidazoles is disclosed in which aromatic bis-orthoaminosulfonamides and aromatic dicarboxylic acids or derivatives thereof are polymerized in polyphosphoric acid. The process provides thermally stable heterocyclic polymers of very high molecular weight that are especially useful in forming films and fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.