Methacrylic Acid → Methyl methacrylate methoxyethyl methacrylate benzyl methacrylate methacrylic acid

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560.0 g of methyl ethyl ketone was placed in a 2 L three-necked flask equipped with a stirrer, a thermometer, and a reflux cooling tube, and heated to a temperature of 87° C. While maintaining the gas inside the reaction vessel in a refluxed state (thereafter, refluxing was continued until the reaction was completed), to this reaction vessel, a mixture including 266.8 g of methyl methacrylate, 63.8 g of methoxyethyl acrylate, 203 g of benzyl methacrylate, 46.4 g of methacrylic acid, and 2.32 g of “V-601” (trade name, manufactured by Wako Pure Chemical Industries, Ltd.) was added dropwise at a constant speed so as to complete the addition in two hours. After completing the addition, the resulting mixture was stirred for one hour. Thereafter, a solution of 1.16 g of “V-601” and 6.4 g of methyl ethyl ketone was added thereto, and the mixture thus obtained was stirred for two hours (process (1)). Subsequently, this process (1) was repeated for four times. Then, a solution of 1.16 g of “V-601” and 6.4 g of methyl ethyl ketone was further added, and stirring was continued for 3 hours. After completion of the polymerization reaction, the temperature of the resulting solution was lowered to 65° C. and then, 163.0 g of isopropanol was added thereto and cooled while leaving it standing still. In this way, a resin solution of a copolymer (methyl methacrylate/methoxyethyl methacrylate/benzyl methacrylate/methacrylic acid=46/11/35/8) was obtained. The obtained copolymer had a weight average molecular weight (Mw) of 63,000 and an acid value of 65.1 mgKOH/g.

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