Methacrylic Acid → 2-Methylidene-5-phenylpent-4-enoic acid

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A mixture of 78.0 parts by weight of styrene, 2.0 parts by weight of methacrylic acid, 20 parts by weight of ethylbenzene, 0.02 parts by weight of n-dodecyl mercaptan, and 0.03 parts by weight of 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane as an initiator was continuously supplied into a coil type complete mixing reactor at a rate of 2.5 l/hr. so that the reaction mixture was allowed to undergo polymerization at a temperature of 150° C. for an average retention time of 2 hours with a polymer solid concentration of 47%. Subsequently, the polymerization solution was introduced into a 230° C. devolatizing apparatus where the unreacted monomers and the solvent were removed to obtain a styrene-methacrylic acid copolymer. The copolymer thus obtained exhibited a styrene/methacrylic acid weight ratio of 96/4, a weight-average molecular weight of 120,000 and a number-average molecular weight of 63,000 (hereinafter referred to as "SMAA-3").

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