| abstract |
PROBLEM TO BE SOLVED: To provide a composite semipermeable membrane capable of maintaining stain resistance even after washing under low pH conditions. The composite semipermeable membrane of the present invention comprises a microporous support layer, a separation functional layer provided on the microporous support layer, and a coating layer provided on the separation functional layer. A film, comprising the polymer (A) of the coating layer, wherein the polymer (A) contains a polyalkylene oxide component (Aa), a (meth) acrylic acid component (Ab), and an ester bond (Ac). To do. [Selection diagram] None |