Aromatic polymers containing a nitrogen-containing ring group, and process for preparation thereof
US4085090A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1975 |
| Grant date | Apr 18, 1978 |
| Priority date | — |
| Expiry date | May 29, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/62
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Novel aromatic polymers containing a nitrogen-containing ring group which comprises at least 30 mol% of a recurring unit of the formula ##STR1## Preferably,, the nitrogen-containing ring group ##STR2## is a benzimidazolone, benzimidazolthione, benzimidazole, quinoxalidinedione, benzotriazole, benzothiazolidine, benzothiadiazolidine-S-oxide, benzothiadiazolidine-S-dioxide, benzodithiadiazine, benzodiazophosphole-p-oxide, benzodiazophosphole, benzodiazosilole, or benzodiazoborole ring. These polymers are soluble in various polar solvents. They find a wide range of applications ascribable to these ring groups, for example, as thermally stable resins and permselective membranes. These polymers can be prepared by reacting substantially linear aromatic polymers comprising at least 30 mol% of a recurring unit of the formula ##STR3## with reagents capable of forming 5- or 6-membered nitrogen-containing rings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.