Polyaryl ether sulfone semipermeable membrane and process for producing same
US4286015A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1979 |
| Grant date | Aug 25, 1981 |
| Priority date | — |
| Expiry date | May 1, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31533
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A semipermeable membrane made of a polyaryl ether sulfone comprised of recurring units represented by the general formula (I): ##STR1## wherein X, X', X" and X"' are non-dissociative substituents, and l, m, n and o are integers of from 0 to 4. The membrane, which is composed of a single continuous polymer phase, has pores of a diameter increasing progressively and continuously from the surface layers to the center portion thereof. The membrane is prepared by the process wherein: PA1 the polyaryl ether sulfone is dissolved in a mixed solution to form a dope of the polyaryl ether sulfone; PA1 the polyaryl ether sulfone dope is extruded to form a fiber or film and, then; PA1 both sides of the fiber or film are contacted with a liquid miscible with the mixed solvent but incapable of dissolving the polyaryl ether sulfone to remove substantially all the mixed solvent from the fiber or film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.