Composite solvent resistant nanofiltration membranes
US6113794A · kind A · utility
Inventors
Key dates
| Filing date | Jan 25, 1999 |
| Grant date | Sep 5, 2000 |
| Priority date | — |
| Expiry date | Jan 25, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention disclosed relates to a nanofiltration composite membrane that is solvent and pH stable and may be used to separate at least one dissolved or suspended component from a liquid phase, including (a) a substrate ultrafiltration membrane formed from an ethylenically unsaturated nitrile, such as acrylonitrile and substituted acrylonitrile polymers, and (b) a coating of a hydrophilic polymer containing reactive functional groups. Preferably, the reactive functional groups described in (b) are subjected to a post-coating cross-linking reaction with a substantially non-cytotoxic cross-linking agent such as bi-functional aldehydes. A method for the preparation of such composite membranes is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.