Patent ID: 8011517

Claim:
A method for making a composite membrane, comprising: applying a coating composition to a surface of a filtration membrane, wherein the coating composition comprises: a hydrophilic compound (A) selected from at least one of PEG-methacrylates, PEG-acrylates, PEG-diacrylate, PEG-dimethacrylate, or PEG-diepoxides; a polymerizable compound (B) selected from monomers with the formula [(RNR 1 R 2 R 3 ) + X − ], wherein R is a (meth)acryl functional group, N is nitrogen, R 1 -R 3 , which may be the same or different, may be hydrogen or alkyl, and X is a halide, wherein the ratio by weight of the compound (A) to the compound (B) is about 1:1 to about 3:1; and about 50 wt % to about 80 wt % water; and curing the composition to form a layer on the membrane.