| abstract |
An object of the present invention is to provide a method for producing a composite semipermeable membrane having excellent pollution resistance, in particular, microbial contamination characteristics, at low cost and easily, and a composite semipermeable membrane produced by the above method. The present invention is a step of forming a skin layer comprising a polyamide-based resin formed by reacting a polyfunctional amine component and a polyfunctional acid halide component on the surface of a porous support, a silver salt compound directly or on another layer on the skin layer. And a process for forming a polymer layer A containing the above, and a step of reducing the silver salt compound to deposit metal silver in the polymer layer A and / or on the surface thereof. |