Semipermeable membranes of modified styrene-based polymers, process for their manufacture and their use
US4720345A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1986 |
| Grant date | Jan 19, 1988 |
| Priority date | — |
| Expiry date | Mar 17, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Semipermeable membranes of modified styrene polymers are obtained by modifying styrene polymers containing reactive groups PA0 (A) through chemical reaction with PA1 (a) a monomeric compound containing at least two functional groups, PA1 (b) a polyfunctional oligomer of polymer, and PA1 (c) a compound containing at least one, preferably two groups capable of reaction with (b), provided that the reactive groups are amino, hydroxyl or mercapto groups, PA0 (B) through chemical reaction with components (b) and (c), provided that the reactive groups are halogen atoms, aldehyde, cyanate or thiocyanate groups, or PA0 (C) through chemical reaction with hydroxylamine and components (a), (b) and (c), provided that the reactive group is a nitrile group. The new membranes can be used in reverse osmosis and ultrafiltration processes. They show good permeability (flux) and rejection characteristics as well as good solvent, compaction and temperature resistance. Their range of molecular cut-offs lies preferably between about 200 and 2000.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.