Chemically modified semipermeable membranes and their use in reverse osmosis and ultrafiltration
US4690765A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1985 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | Jan 22, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Semipermeable membranes of modified polysulfones are provided which comprises repeating units of the formula EQU --M.sub.1 --R.sub.1 --M.sub.2 --R.sub.2 --SO.sub.2 --R.sub.3 --(1) wherein M.sub.1 and M.sub.2 are independently a valence bond, --O-- or --NH--, R.sub.1 is a valence bond or a group of the formula ##STR1## with the proviso that if R.sub.1 is a valence bond, only one of M.sub.1 and M.sub.2 can be --O--, R.sub.2 and R.sub.3 are independently a group of the formula ##STR2## the aryl radicals R.sub.1, R.sub.2 and R.sub.3 are optionally further substituted, R.sub.4 is a valence bond, --O--, alkylene of 1 to 4 carbon atoms optionally substituted or interrupted by cycloalkyl(ene) or aryl(ene) of at most 7 carbon atoms, or alkylidene of 2 to 4 carbon atoms, R.sub.5 to R.sub.10 are independently hydrogen, or ##STR3## radicals, these radicals being modified through chemical reactions with (a) a monomeric compound containing at least two functional groups, (b) a polyfunctional, linear or branched oligomer or polymer, and (c) a non-ionic and/or ionic compound containing at least one, preferably two groups capable of reaction with (b), PA1 --R.sub.12 X or --R.sub.13 CHO radicals, mo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.