PURPOSE: To provide an ion exchange membrane speedy in the rate of ion exchange and so free of a failure in ion exchange as to leak no ions to be trapped thereby.
CONSTITUTION: A fiber is mixed with org. ion exchanger particles, followed by machining the resultant mixture into a paper. A fiber is mixed with cation exchanger particles and anion exchanger particles, followed by machining the resultant mixture into a paper. The fiber surface of a nonwoven fabric is coated or impregnated with a mixture of ion exchanger particles and a binder. Ion- exchangeable functional groups are introduced into the fiber surface portions of the nonwoven fabric through graft copolymn. Ion-exchangeable particles are borne on the wall surfaces of micropores of a hollow fiber membrane. Ion-exchangeable functional groups are introduced into the wall surface portions of micropores of a hollow fiber membrane through graft copolymn.
WAKASA AKIRA
OOUCHI MUNESHIRO
