Preparation of permselective composite membrane
US4260652A · kind A · utility
13Cited by
6References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1978 |
| Grant date | Apr 7, 1981 |
| Priority date | — |
| Expiry date | Jun 5, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S524/909
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process and composition for producing a permselective composite membrane. The process comprises dissolving a specified imidazolone ring-containing aromatic polymer in an aqueous liquid medium containing a water-miscible amine having a pKa of more than 5.0 in a concentration of at least 5% by weight, coating the polymer solution on a microporous substrate, and drying the coating to form an ultrathin film on the substrate. The permselective composite membrane obtained is especially useful as a reverse osomsis membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.