Patent ID: 9459188
Filing Date: 2016-10-04
CPC Classification: B01D,B01J,C07K,G01N,Y10T

Claim Text:
1. A method for functionalizing a porous membrane, the method comprising: (a) providing a porous membrane substrate comprising a plurality of membrane pores; and (b) contacting the membrane pores with an aqueous fluid mixture (i) having a pH value less than 3.8 and (ii) comprising a polyacid polymer comprising free acid groups selected from the group consisting of carboxylic acid groups, carboxylate groups, and combinations thereof for a time sufficient to adsorb a polyacid layer on surfaces of the membrane pores, thereby forming a polyacid-coated porous membrane comprising the free acid groups; wherein the polyacid-coated porous membrane substrate comprises a plurality of polyacid layers, wherein (i) a first polyacid layer is adsorbed directly on the porous membrane substrate and (ii) one or more further polyacid layers are adhered to adjacent polyacid layers via one or more intervening polycation layers.