Semipermeable composite membrane and process for preparation thereof

摘要

A semipermeable composite membrane comprising a thin semipermeable film of a polymeric material deposited on one side of the microporous substrate, said polymeric material being prepared by interfacial crosslinking of a polymer containing a recurring unit of the formula <IMAGE> (I) wherein each of R1 and R2 represents a hydrogen atom or a methyl group, and W1 represents a direct bonding or a sulfonyl group (-SO2-), with a polyfunctional compound containing at least two functional groups selected from acid halide, sulfonyl halide, isocyanate, N-haloformyl, haloformate and acid anhydride groups; and a process for producing the same. The semipermeable composite membrane of this invention is especially useful for desalination of saline or brackish water by reverse osmosis.