Method for preparing semipermeable membrane compositions
US4764320A · kind A · utility
30Cited by
7References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1987 |
| Grant date | Aug 16, 1988 |
| Priority date | — |
| Expiry date | Jun 12, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/0065
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Semipermeable membranes with improved permeation flux are prepared by contacting a glassy polymer in the form of a hollow fiber or film with a solvent in which the polymer swells at conditions which permit the swelling solvent to diffuse into the glassy polymer and then stretching the swollen polymer in an amount sufficient to cause visible stress whitening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.