Method for modifying the pore size distribution of a microporous separation medium
US4239714A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1978 |
| Grant date | Dec 16, 1980 |
| Priority date | — |
| Expiry date | Nov 15, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The pore size distribution of a microporous separation medium, such as a membrane or gel, is modified so as to provide it with a sharp upper cut-off of preselected molecular size. The modification is effected by first filling the pores of the separation medium with a volatile liquid, and then evaporating a controlled amount of the volatile liquid to form voids at the entrances to the pores. A concentrated solution of a cross-linkable or polymerizable pore-blocking agent, such as a protein, enzyme or polymeric material, is then applied to the surface of the separation medium. The pore-blocking agent is a material which is insoluble in the volatile liquid and whose molecular size distribution has a lower limit corresponding to the preselected molecular size, whereby the pore-blocking agent selectively enters only those pores larger than the preselected size and remains in the voids at the entrances to the pores. After removing excess pore-blocking agent solution from the surface of the separation medium, the pore-blocking agent is insolublized by cross-linking or polymerization so as to immobilize it within the voids and thereby obstruct the entrances to all of the pores larger than …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.