Polyvinyl alcohol semi-permeable membrane and method for producing same
US4279752A · kind A · utility
36Cited by
5References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 1979 |
| Grant date | Jul 21, 1981 |
| Priority date | — |
| Expiry date | May 21, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2329/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A polyvinyl alcohol (PVA) microporous membrane is disclosed which is prepared by a process which comprises forming a PVA membrane containing fine silica particles therein and substantially extracting said silica particles from said membrane, thereby forming a plurality of micropores therein with an average diameter of 0.01 to 50 microns and a porosity of at least 60%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.