Semi-permeable membranes prepared via reaction of cationic groups with nucleophilic groups
US4797187A · kind A · utility
103Cited by
37References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1987 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Aug 17, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249978
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A novel composite membrane and methods of making the membrane are described. The discriminating layer of the membrane is prepared by reaction of a reactive cationic compound group with a compound bearing a nucleophilic moiety. At least one of the reactants bears an average of two or more reactive groups. The reaction product contains covalent bonds formed via charge eliminating reactions. In a preferred embodiment of the invention, the nucleophilic group is anionic and a coacervate is formed initially on a microporous substrate. The resulting membrane may be useful for reverse osmosis, gas or ultrafiltration separations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.