Process for surface modifying a microporous membrane
US4915839A · kind A · utility
56Cited by
3References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1988 |
| Grant date | Apr 10, 1990 |
| Priority date | — |
| Expiry date | Dec 30, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/36
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for surface modifying skinless hydrophilic microporous membrane having an internal microstructure throughout said membrane and a surface modifying amount of surface modifying agent bound thereto without substantial pore reduction of pore blockage involves the steps of providing a dope solution of a membrane forming polymer in a solvent system comprising a mixture of at least one solvent and one non-solvent for the polymer, and a membrane surface modifying agent, and combining said dope solution with sufficient additional non-solvent for the polymer to precipitate said membrane from said dope solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.