Process for preparing aromatic polyimide semipermeable membranes
US4378324A · kind A · utility
67Cited by
7References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1980 |
| Grant date | Mar 29, 1983 |
| Priority date | — |
| Expiry date | Jul 23, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/62
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A polyimide semipermeable membrane is prepared by the process comprising the steps of: PA0 preparing a solution of a polyimide material consisting essentially of at least one aromatic polyimide comprising at least 90 molar % of at least one recurring unit of the formula (I): ##STR1## wherein R represents a divalent aromatic radical, in a solvent consisting of at least one phenol compound in the state of a liquid or melt; PA0 forming a thin layer of the polyimide solution, and; PA0 coagulating the thin layer of the polyimide solution by bringing the thin layer into contact with a coagulating liquid to form a semipermeable membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.