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| - Alternatively, polymers having a functional group such as a hydroxy group, halogenated methyl group, epoxy group or the like on a side chain may be used, such as a polymer obtained by polymeric reaction of polyvinyl alcohol, poly(2-hydroxyethyl methacrylate), epoxy resin, phenoxy resin polyepichlorohydrine or the like, with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, cro
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