| 摘要 |
PURPOSE:To readily obtains the titled high-purity polymer, by continuously feeding a half or more of a methacrylic monomer and completing the feeding of a functional group-containing mercaptan based chain transfer agent at a specific value of the conversion of the above-mentioned monomer in radically polymerizing the monomer. CONSTITUTION:A methacrylic monomer, e.g. methyl methacrylate, etc., is radically polymerized to give a methacrylic polymer having a functional group at one terminal thereof. In the process, >=50% based on the amount used thereof is continuously fed and the feeding of a functional group-containing chain transfer agent, preferably 2-mercaptopropionic acid, etc., is completed at <=80% conversion of the above-mentioned monomer. The above-mentioned polymerization reaction is preferably carried out by a solution polymerization method using a polymerization initiator, e.g. 2,2-azobisisobutyronitrile, etc., in the presence of a solvent, e.g. toluene, etc.
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