Cationic charge modified microporous membrane

Details Cationic charge modified microporous membrane Cationic charge modified microporous membrane

1990-09-17

1992-09-29

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210645, 210490, 21050039, 521 27, 204299R, B01D 6700

Patent

active

051511894

ABSTRACT:
Cationic charge modified microporous hydrophilic membranes are provided, as well as preparation of the same by post-treatment. Typically, as an illustration, a microporous hydrophilic 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 fixed formal positive charge (or for reaction with the primary charge modifying agent alone); then cured at elevated temperature; and finally washed and dried. The cationically charged microporous membranes are used in various applications such as the filtration of fluids and the macromolecular transfer from electrophoresis gels.

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patent: 4964990 (1990-10-01), Kraus et al.

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