Patent ID: 7913857

Claim:
A composite polyamide reverse osmosis membrane, said composite polyamide reverse osmosis membrane comprising: (a) a microporous support; (b) a polyamide layer on said microporous support, said polyamide layer being the interfacial reaction product of a polyfunctional amine and a polyfunctional acyl halide; and (c) a hydrophilic coating on said polyamide layer, said hydrophilic coating being formed by covalently bonding a hydrophilic compound to the polyamide layer, wherein said hydrophilic compound includes (i) at least one reactive group, said at least one reactive group being at least one of a primary amine and a secondary amine, said at least one reactive group being covalently bonded directly to the polyamide layer through the reaction of said at least one reactive group with a residual acyl halide of the polyamide layer to form an amide group; and (ii) at least one non-terminal hydroxyl group.