C(O[CH2:7][C:8]1[CH:13]=[CH:12]C=[CH:10][CH:9]=1)(=O)C(C)=C.[C:14]([O:18]C)(=O)[CH:15]=[CH2:16].S[CH2:21]CC(OC)=O.CC(N=NC(C#N)(C)C)(C#N)C.CCCCCCCCC(C)C>>[CH3:10][CH2:9][CH:8]([CH2:13][CH2:12][C:14]([OH:18])([CH2:15][CH3:16])[CH3:21])[CH3:7]A mixed solution of the whole amount of the above-described resin grain dispersion (as seed) and 10 g of Dispersion Stabilizing Resin (Q-1) was heated to a temperature of 60° C. under nitrogen gas stream with stirring. To the mixture was added dropwise a mixture of 85 g of benzyl methacrylate, 15 g of methyl acrylate, 1.0 g of methyl 3-mercaptopropionate, 0.8 g of AIVN and 200 g of Isopar H over a period of 2 hours, followed by further reacting for 2 hours. Then 0.8 g of AIVN was added to the reaction mixture, the temperature thereof was raised to 70° C., and the reaction was conducted for 2 hours. Further, 0.6 g of AIVN was added thereto, followed by reacting for 3 hours. After cooling, the reaction mixture was passed through a nylon cloth of 200 mesh to obtain a white dispersion which was a latex of good monodispersity having a polymerization ratio of 98% and an average grain diameter of 0.25 μm.
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