| 摘要 |
PROBLEM TO BE SOLVED: To provide a cation exchange membrane used for producing edible salt, improving concentrating performance without increasing electric resistance as compared with those of conventionally used membranes. SOLUTION: This cation exchange membrane is characterized by filling a copolymer having at least styrene and divinylbenzene as copolymerization components into the pores of a porous substrate material consisting of a polyolefin, irradiating an ionizing radiation, and then introducing a sulfonic acid group. The cation exchange membrane is also characterized by filling a polymerizable mixture containing at least the styrene having a functional group capable of introducing a sulfonic acid group and divinylbenzene into the above pores, performing thermal polymerization, irradiating the ionizing radiation, and then introducing the sulfonic acid group. The method for producing the membrane is also provided. COPYRIGHT: (C)2009,JPO&INPIT |
