Selective membrane having a high fouling resistance

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ABS _TRA( OF THE DISCLOSURE A selective membrane having a high fouling resistance. In one embodiment, the selective membrane is a composite polyamide reverse osmosis membrane in which a hydrophilic costing is applied to the polyamich : lay oldie membrane, the hydrophilic coating being made by covalently bonding a hydrophilio compound to residual acid chloride of the polyamide membrane, the hydrophilic compound including (i) at least one re, ac e group that is adapted to covalently bond directly to the polyamide membrane, the at Iratest one reactive group being at least one of a primary amine and a secondary amine; and (h at least one hydmphilic group, the at least one hydropbili¢ group being selected f om the group consisting of a hydroxyl group, a carbonyl group, a trialkoxysilane group, an anionic group and a tertiary amino group; (iii) wherein the hydrophiti¢ compound is devoid ofa polyalkylene oxide group.