RESIN COMPOSITION FOR FINE POROUS SUPPORT MEMBRANE, FINE POROUS SUPPORT MEMBRANE USING THE SAME, AND COMPOSITE SEMIPERMEABLE MEMBRANE

摘要

PROBLEM TO BE SOLVED: To provide a fine porous support membrane for a composite semipermeable membrane being high in the salt checking ratio and excellent in water permeability and a resin composition for forming the fine porous support membrane.SOLUTION: A resin composition for a fine porous support membrane of the present invention includes aromatic polysulfone and aromatic polyether having a proton acid group. The present invention can provide a resin composition for a fine porous support membrane capable of providing a composite semipermeable membrane that can reveal higher water permeable performance than a composite semipermeable membrane using a conventional fine porous support membrane composed of a polysulfone single body, while maintaining the salt checking ratio and suitable for forming a fine porous support membrane constituting the composite semipermeable membrane; a fine porous support membrane formed by using the resin composition for the fine porous support membrane; and a composite semipermeable membrane having a fine porous support membrane layer.