Methacrylic Acid → Methacrylic acid ethylene oxide

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Into a reaction vessel equipped with a stirring rod and a thermometer, 683 parts by mass of water, 11 parts by mass of sodium salt of methacrylic acid ethylene oxide adduct sulfate ester (ELEMINOL RS-30, manufactured by Sanyo Chemical Industries, Ltd.), 10 parts by mass of polylactic acid, 60 parts by mass of styrene, 100 parts by mass of methacrylic acid, 70 parts by mass of butyl acrylate, and 1 part by mass of ammonium persulfate were charged and then stirred at 1,500 rpm for 20 minutes, to thereby obtain a white emulsion. Then, the temperature of the reaction system was raised to 75° C. by heating and reacted for 3 hours. Further, 30 parts by mass of a 1% by mass aqueous ammonium persulfate solution was added to the reaction system and aged at 65° C. for 12 hours, to thereby obtain an aqueous dispersion liquid of a vinyl resin (a copolymer of styrene-methacrylate-butyl acrylate-sodium salt of methacrylic acid ethylene oxide adduct sulfate ester), i.e., Fine Particle Dispersion Liquid 6. The volume average particle diameter of Fine Particle Dispersion Liquid 6 was 720 nm as measured with a particle size distribution measurement device (LA-920, manufactured by HORIBA, Ltd.). A part of Fine Particle Dispersion Liquid 6 was dried so that the resin part was isolated therefrom. The resin part had Tg of 57° C., and a weight average molecular weight of 120,000.

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