Patent ID: 7537697
Filing Date: 2009-05-26
Classification: B01D

Abstract:
1. A composite polyamide reverse osmosis membrane comprising: (a) a microporous support; (b) a polyamide layer on said microporous support; and (c) a hydrophilic coating on said polyamide layer, said hydrophilic coating being made by applying a hydrophilic compound to said polyamide layer, said hydrophilic compound including (i) at least one reactive group adapted to covalently bond directly to the polyamide membrane, said at least one reactive group being at least one of a primary amine and a secondary amine; and (ii) at least one hydrophilic group, said at least one hydrophilic group being selected from the group consisting of a hydroxyl group, a carbonyl group, a trialkoxysilane group, an anionic group, and a tertiary amino group; (iii) wherein said hydrophilic compound is devoid of a polyalkylene oxide group and wherein said hydrophilic compound is selected from the group consisting of 1,3-diamino-2-propanol, ethanolamine, diethanolamine, 3-amino-1-propanol, 4-amino-1-butanol, and 2-amino-1-butanol.