Mixed bed ion exchange resin with modified cation exchange resin

摘要

The present invention provides cationic exchange resin that maintains a high exchange speed of polyvalent ions in addition to monovalent ions without agglomeration occurring in spite of surface coating even when mixed bed ion-exchange resin is used. The cationic exchange resin is modified with a water-soluble cationic polymer electrolyte having an intramolecular cyclic quaternary ammonium salt structure.