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|1. (WO2018180547) MOLECULAR-WEIGHT CONTROLLING AGENT FOR RADICAL POLYMERIZATION, METHOD FOR PRODUCING POLYMER USING SAME, AND POLYMER|
|Applicants:||SDP GLOBAL CO., LTD.
GODO SHIGEN CO., LTD.
|Title:||MOLECULAR-WEIGHT CONTROLLING AGENT FOR RADICAL POLYMERIZATION, METHOD FOR PRODUCING POLYMER USING SAME, AND POLYMER|
The purpose of the present invention is to provide: a molecular-weight controlling agent for radical polymerization which enables controlled radical polymerization of a water-soluble monomer in an aqueous medium; a method for producing a polymer of a water-soluble vinyl monomer using the same; and a water-soluble vinyl monomer polymer. The present invention provides a molecular-weight controlling agent for radical polymerization characterized in that the agent comprises, as its active ingredient, an iodine compound represented by formula (1) and in that the solubility of the active ingredient in water is 0.5 weight% or more at 20°C. (1) In the formula, R1 is -COOX, -CONR4R5, an aromatic group, or a cyano group, X is a hydrogen atom, an aliphatic group, an alkali metal, an alkaline earth metal, an organic ammonium, or an ammonium, and R2, R3, R4, and R5 are each independently a hydrogen atom, an aromatic group, or an aliphatic group.