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Further, 30 parts of a 1% aqueous solution of ammonium persulfate were added thereto, and the mixture was aged for 5 hours at 75° C. Thus, an aqueous dispersion (i.e., a particulate resin dispersion (A2)) of a vinyl resin (i.e., a copolymer of styrene/methacrylic acid/sodium salt of sulfate of ethylene oxide adduct of methacrylic acid) was prepared.