Composite hydrophilic membrane and method for manufacture thereof
US4670146A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1982 |
| Grant date | Jun 2, 1987 |
| Priority date | — |
| Expiry date | Jun 23, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E50/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composite hydrophilic membrane comprising a very thin semipermeable hydrophilic membrane containing a sulfonic group and a polyethylenic microporous membrane containing sulfonic group. This hydrophilic membrane has specially high permeation rate of water and excellent separation ability. The composite hydrophilic membrane is manufactured by a method which comprises fusing a very thin membrane containing an ethylenic copolymer onto the surface of a polyethylenic microporous membrane or a polyethylenic membrane capable of being converted into a microporous membrane thereby forming a composite film, converting the resin film prior to and/or during and/or after sulfonation into a microporous membrane, and causing the composite film to react with a sulfonating agent. This method permits easy and efficient production of the composite hydrophilic membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.