Sulphonated polyaryl-ether-sulphones and membranes thereof
US4054707A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1975 |
| Grant date | Oct 18, 1977 |
| Priority date | — |
| Expiry date | Dec 23, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31533
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Novel sulphonated polyaryl-ether-sulphone resins are described which are particularly suitable for producing semi-permeable membranes, in particular for reverse osmosis. These resins consist essentially of a plurality of units of the formula: ##STR1## and, optionally, a plurality of units of the formula: ##STR2## in which A.sub.1, A.sub.2, A.sub.3, A.sub.4 and A.sub.5 each represents a phenylene radical at least one of which is substituted by an optionally salified sulpho (--SO.sub.3 H) radical, the relative proportions of units of formula (I) and (II) and the degree of substitution by sulpho radicals being such that the number of sulpho groups is from about 0.1 to about 5 milliequivalents per gram of dry resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.