| http://www.w3.org/ns/prov#value | - f the above-mentioned monomer and another vinyl monomer, and (b) a compound selected from the group consisting of halogenated triazine compounds, diphenyliodonium salt derivatives and triphenylsulfonium salt derivatives: wherein R1 is hydrogen or a methyl group; and R2 is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.
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