Crosslinked, interpolymer fixed-charge membranes
AssigneeHarry P. Gregor
InventorHarry P. Gregor
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Abstract
Interpolymer fixed-charge membranes of macroscopic homogeneity are prepared by providing a solution containing a matrix polymer, a polyelectrolyte and a crosslinking agent, evaporating the solvent until substantially the desired pore size and other physical properties are obtained in a film cast from the solution, the thereafter chemically crosslinking the film to insolubilize the membrane.
Claims3
A chemically cross-linked non-fouling polymeric membrane including polyelectrolytes having fixed-charge groups and characterized by a hydraulic permeability of 10.sup..sup.-3 to 10.sup..sup.-7 cm/sec. atm. measured in water or dilute salt solution under a pressure of 60 to 100 psi, a water content of from about 15 to about 75%, and characterized by a uniform porosity which produces a salt rejection of from 1.0 to 85% measured using 0.01 M potassium chloride solution at 25.degree.C and 60 to 100 psi.
Dependencies are inferred from the claim text.