Methacrylic Acid → Phenoxyethylmethacrylate methylmethacrylate methacrylic acid

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To a 1000-ml three-neck flask equipped with a stirrer and a condenser, 88 g of methyl ethyl ketone was added, and then heated to 72° C. under a nitrogen atmosphere. To this flask, a solution in which 0.85 g of dimethyl-2,2′-azobisisobutyrate, 50 g of phenoxyethyl methacrylate, 13 g of methacrylic acid, and 37 g of methyl methacrylate were dissolved in 50 g of methyl ethyl ketone was added dropwise over 3 hours. After completion of the dropwise addition, the content in the flask was allowed to react for an additional one hour, and then, a solution in which 0.42 g of dimethyl-2,2′-azobisisobutyrate was dissolved in 2 g of methylethyl ketone was added thereto, the temperature of the mixture was raised to 78° C., and the mixture was heated for 4 hours. The resulting reaction solution was subjected to re-precipitation twice with an excess amount of hexane, and the precipitated resin was dried and 96.5 g of phenoxyethyl methacrylate/methyl methacrylate/methacrylic acid (copolymerization ratio [% by mass ratio]=67/20/13) copolymer (resin dispersant P-1) was obtained.

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