Modification of polyvinylidene fluoride membrane and method of filtering
US5531900A · kind A · utility
109Cited by
5References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1994 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Jul 7, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/385
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
There is provided a filter medium comprising a microporous polyvinylidene fluoride membrane and a polymer containing a positively charged organic phosphonium compound grafted to the membrane in a concentration sufficient to provide a surface of said membrane with a positive charge such that there is minimal susceptibility to the extraction of said polymer. The polymer may also contain an acrylate or methacrylate. There is also provided a method for ultrapurifying a liquid and an ultrapurifying system for water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.