Process for charge modifying a microphorous membrane
US4711793A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1984 |
| Grant date | Dec 8, 1987 |
| Priority date | — |
| Expiry date | Sep 18, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/36
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process is provided for for cationically charge modifying a microporous filter membrane, wherein the membrane is a substantially symmetrical isotropic, hydrophilic, organic polymeric microporous filter membrane, preferably nylon, having a microstructure throughout the membrane. The process comprises bonding a primary charge modifying amount of a water soluble cationic charge modifying agent to substantially all of the membrane microstructure, without substantial pore size reduction or pore blockage. The charge modifying agent is a reaction product of a polyamine with epichlorohydrin, the reactive product having (i) tertiary amine or quaternary ammonium groups, and (ii) epoxide groups along a polyamine chain, the epoxide groups capable of bonding to the microstructure of the membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.