| http://www.w3.org/ns/prov#value | - For example, in a preferable method for bonding the cationic compound to the filter substrate by graft copolymerization, the filter substrate is subjected to a plasma treatment, and graft-copolymerized with a monomer having a reactive substituent such as glycidyl methacrylate, and then a cationic agent is bonded to the grafted monomer.
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