Patent ID: 8637174

Claim:
A membrane comprising: (a) one or more polymers having functional groups selected from the group consisting of cation exchange groups and their non-ionic precursors of the type SO 2 X, POX 2 , COX, basic primary, secondary and tertiary amino groups, imidazole groups, pyridine groups, pyrazole groups and OH groups where X is a halogen, —OH, —OMe, —NR 1 R 2 , or —OR 1 where Me is selected from the group consisting of metal cations, transition metal cations, and ammonium cations, and wherein R 1 and R 2 are selected from the group consisting of H, aryl- and alkyl- radicals; and (b) a low molecular weight hydroxymethylene-oligo-phosphonic acid R—C(PO 3 H 2 ) x (OH) y where R is selected from the group of organic radicals and x, y are integers.