Patent ID: 6486240
Filing Date: 2002-11-26
Classification: B01D,Y10T

Abstract:
A method for producing an asymmetric support membrane, said method comprising:1) dissolving a polymer in a solvent to form a solution containing 15 to 35 wt. % of said polymer, and 2) allowing said solution to form a physical gel then immersing said physical gel into water to form said asymmetric support membrane by phase separation, wherein said polymer is selected from the group consisting of poly(vinyl chloride), polyethersulfone, polyetherimide and polyamic(methylester); said solvent is capable of dissolving said polymer to form a gel at 0 to 50Â° C., said solvent is &ggr;-butyrolactone or a mixture of &ggr;-butyrolactone with N-methyl-2-pyrrolidone; and wt. % is based on the total weight of the polymer solution.