Nippon Soda Co., Ltd.

Tooru Kawabe

Hitoshi Matsumoto

Takeshi Shimotori

Hideo Kubo

Disclosed is a method for producing a polymer through living polymerization, comprising forming an oligomer having a polymerization active end, which is an oligomer higher than an average 1.0-mer and lower than an average 4.0-mer or an average 4.0-mer, and polymerizing using the oligomer having a polymerization active end as an initiating species, wherein the acrylic acid-based polymer comprising a repeating unit derived from a poly(&#x3b1;-lower alkyl)acrylate, and a repeating unit derived from an (&#x3b1;-lower alkyl)acrylic ester represented by formula (I) wherein Rrepresents a hydrogen atom or a lower alkyl group, and Rrepresents an organic group having a polar group in an arm portion.

Method of producing an acrylic acid-based polymer

Disclosed are an acrylic acid-based polymer which is a star polymer containing a repeating unit derived from an (&#x3b1;-lower alkyl)acrylic ester represented by formula (I): (wherein Rrepresents a hydrogen atom or a lower alkyl group, and Rrepresents an organic group having a polar group) in an arm portion; an acrylic acid-based polymer containing a repeating unit derived from an poly(&#x3b1;-lower alkyl)acrylic ester and a repeating unit derived from an (&#x3b1;-lower alkyl)acrylic ester represented by formula (I), and a method for producing a polymer through living polymerization, comprising forming an oligomer having a polymerization active end, which is an oligomer higher than an average 1.0-mer and lower than an average 4.0-mer or an average 4.0-mer, and polymerizing using the oligomer having a polymerization active end as an initiating species.

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Ichihara, Japan

Tooru Kawabe