METHOD OF MANUFACTURING A REVERSE OSMOSIS MEMBRANE AND THE MEMBRANE SO PRODUCED

摘要

TITLE "A method of Manufacturing a Reverse Osmosis Membrane and the Membrane so Produced" INVENTORS Michael D. Guiver André Y. Tremblay Chung M. Tam Reverse osmosis membranes are manufactured by casting a polysulfone casting composition comprising: i) an aromatic polysulfone derivative having repeat units, at least an average of about 20% of which are carboxylated and are of the formula I: <IMG> (I) ,wherein each R in each formula is ortho to the sulfone, at least one R in each formula is a carboxyl group with any remainder thereof being hydrogen, and ii) a solvent for the aromatic polysulfone derivative, then evaporating solvent from the casting composition and then gelling the casting composition into a reverse osmosis membrane. The permeability of the reverse osmosis membrane may be increased by the addition of a non-solvent for the aromatic polysulfone derivative to the casting composition.