Cationic charge modified microporous membrane
US5151189A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1990 |
| Grant date | Sep 29, 1992 |
| Priority date | — |
| Expiry date | Sep 17, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/38
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Cationic charge modified microporous hydrophilic membranes are provided, as well as preparation of the same by post-treatment. Typically, as an illustration, a microporous hydrophilic membrane substrate which contains non-leachable polymeric additive having functional groups is treated in an alkaline solution for simultaneous or sequential reaction with 1) a primary charge modifying agent which is an epichlorohydrin modified polyamine, and 2) a secondary polymeric charge modifying agent containing a fixed formal positive charge (or for reaction with the primary charge modifying agent alone); then cured at elevated temperature; and finally washed and dried. The cationically charged microporous membranes are used in various applications such as the filtration of fluids and the macromolecular transfer from electrophoresis gels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.