Cationic charge modified microporous membranes

Details Cationic charge modified microporous membranes Cationic charge modified microporous membranes

1991-08-20

1993-12-14

Spear, Frank

Liquid purification or separation

Processes

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

210645, 21050039, B01D 6700

Patent

active

052699315

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 throughout multiple reprobing cycles.

REFERENCES:
patent: 4512896 (1985-04-01), Gershoni
patent: 4964990 (1990-10-01), Kraus et al.
patent: 5006287 (1991-04-01), Davis
patent: 5151189 (1992-09-01), Hu et al.

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