▎ 摘　　要

NOVELTY - Ion exchange membrane with improved monovalent ion selectivity comprises a modified layer containing a conductive resin and reduced graphene particles on surface of the pore-filled ion exchange membrane. The monovalent ion selectivity of the ion exchange membrane does not include the modified layer (M1), when the monovalent ion selectivity of the ion exchange membrane including the modifying layer (M2), where the monovalent ion selectivity of the ion exchange membrane satisfies following relation, as given in specification. USE - Used as ion exchange membrane. ADVANTAGE - The ion exchange membrane has low electric resistance, high ion conductivity and high monovalent ion selectivity, and enables mass production in easy manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for producing ion exchange membrane, comprising (a) coating a mixed solution containing conductive resin and graphene oxide on the pore-filled ion exchange membrane, and (b) reducing the graphene oxide.