Charge modified microporous membrane
US4673504A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1984 |
| Grant date | Jun 16, 1987 |
| Priority date | — |
| Expiry date | Sep 11, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/36
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A cationic charge modified microporous membrane comprising a hydrophilic organic polymeric microporous membrane and a cationic charge modifying agent bonded to substantially all of the wetted surfaces of the membrane, the charge modifying agent being an epichlorohydrin modified polyamide having tertiary amine or quaternary ammonium groups. A secondary charge modifying agent may be employed selected from: (i) aliphatic polyamines having at least one primary amine or at least two secondary amines; and (ii) aliphatic amines having at least one secondary amine and a carboxyl or hydroxyl substituent. Processes for producing and using the membrane are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.