Acid-base polymer blends and their application in membrane processes
US6300381A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2000 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Sep 19, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides a process for the preparation of ion-exchange membranes for use in electromembrane processes and ion-exchange membranes obtained from the process. The membranes are prepared from a solution, in a dipolar-aprotic solvent, containing (a) a polymeric sulfonic acid or a polymeric sulfonate salt of formula Polymer-SO3X, where X is H or a monovalent cation, and (b) a basic polymer containing primary, secondary or tertiary basic nitrogen. The dissolved polymer blend is spread in a thin layer onto a support, and the solvent is evaporated to form a polymeric film. The films produced by the process are particularly useful as ion-exchange membranes due to improved properties relative to the component polymers with regard to ionic conductivity, swelling permselectivity, and thermal resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.