METHOD FOR PRODUCING COMPOSITE SEMIPERMEABLE MEMBRANE

摘要

PROBLEM TO BE SOLVED: To provide a method for stable production of a composite semipermeable membrane having few skin layer defects and a high filter rate.SOLUTION: A method is provided for producing a composite semipermeable membrane wherein a skin layer is formed on the surface of a porous substrate. The method comprises an impurity removal step of removing impurities deposited on the surface of the porous substrate, before the skin layer is formed on the surface of the porous substrate.