Cationic charge modified microporous membranes
US5269931A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1991 |
| Grant date | Dec 14, 1993 |
| Priority date | — |
| Expiry date | Aug 20, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/38
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Cationic charged semihydrophobic polyethersulfone (CSfIP) membranes having hydrophilic and semihydrophobic properties are provided, as well as preparation of the same by post-treatment. Typically, as an illustration, a microporous hydrophilic polyethersulfone 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 positive charge (or for reaction with the primary charge modifying agent alone); then baked until cured at elevated temperature; and finally washed and dried. The CSHP membranes are used in various applications such as the filtration of fluids and the macromolecular transfer of biomolecules either from electrophoresis gels or directly to immobilization on the membrane for hybridization and stripping. The CSHP membranes--unlike conventional charged membranes which typically show a decrease in sensitivity and reprobing performance--retain their sensitivity and reprobing performance and excel in this regard through…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.