Process for preparing improved cation-exchange membranes
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsSakae Tsushima, Teruyuki Misumi, Masahiko Murakoshi
Life of this patent
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Abstract
An improved cation-exchange membrane, onto which have been adhered fine particles of a crosslinked high molecular weight substance having anion-exchange groups and which can maintain a specific permselectivity for monovalent cations over a long period of time, is prepared with ease by treating a cation-exchange membrane with a suspension of fine particles of the said crosslinked high molecular weight substance.
Claims8
A process for improving a cation-exchange membrane in specific permselectivity for monovalent ions which comprises contacting the cation-exchange membrane with a suspension, in water or in an aqueous solution of a salt containing said monovalent ions, of particles of a crosslinked high molecular weight substance having an anion-exchange group.
Dependencies are inferred from the claim text.