Hydrophilic porous membrane of polyvinylidene fluoride and method for production thereof
US4943373A · kind A · utility
31Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1989 |
| Grant date | Jul 24, 1990 |
| Priority date | — |
| Expiry date | Jul 12, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/918
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A hydrophilic porous membrane of polyvinylidene fluoride excelling in perviousness to water and other various properties and enjoying high commercial value, having uniform hydropilicity imparted to the surface of pores therein, which porous membrane is characterized by the fact that the reflection spectrum thereof in the visible zone is substantially unchanged from that which existed before the treatment for impartation of hydrophilicity. A method for the production of the hydrophilic porous membrane, characterized by chemically treating the porous membrane in a strong alkali solution containing an oxidizing agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.