Acrylic star polymer

a star polymer and acrylic acid technology, applied in the field of acrylic acid-based star polymer, can solve the problems of not being able to achieve satisfactory properties and cannot be said to control molecular weight, and achieve the effect of excellent acid decomposability and great industrial utility valu
US20090209726A1Inactive Publication Date: 2009-08-20NIPPON SODA CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
NIPPON SODA CO LTD
Publication Date
2009-08-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

An object of the present invention is to provide an acrylic acid-based star polymer which has a controlled structure with a narrow molecular weight distribution and acid decomposability. The star polymer contains, as a core portion, a polymer chain having a repeating unit derived from a polyacrylate which has at least two partial structures represented by formula (I):(wherein R1, represents a hydrogen atom or a methyl group, R2 and R3 each independently represents an organic group which is combined via a carbon atom, and a Cl carbon represents a carbon atom which is combined with a moiety via a carbon atom) and, as an arm portion, a polymer chain having a repeating unit derived from a (meth)acrylic ester represented by formula (II):(wherein R4 represents a hydrogen atom or a methyl group, and represents an organic group), excluding a homopolymer chain having a repeating unit derived from a (meth)acrylic ester in which R5 is a C1-C4 alkyl group when R1 in formula (I) is a methyl group.
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Description

TECHNICAL FIELD

[0001] The present invention relates to an acrylic acid-based star polymer and, more particularly, to a star polymer containing a repeating unit derived from a polyacrylate as a core portion and a repeating unit derived from an acrylic ester as an arm portion.

[0002] This application claims priority on Japanese Patent Application No. 2004-162081 filed on May 31, 2004 and Japanese Patent Application No. 2005-132073 filed on Apr. 28, 2005, the disclosure of which is incorporated by reference herein.BACKGROUND ART

[0003] It has been known that a star polymer is obtained by polymerizing methyl methacrylate, isobutyl methacrylate and t-butyl methacrylate using, as an initiator, diphenylhexyllithium obtained by reacting 1,1-diphenylethylene with s-butyllithium, and reacting with dicumyl alcohol dimethacrylate or 2,5-dimethyl-2,5-hexanediol dimethacrylate (see, for example, Nonpatent Document 1).

[0004] [Nonpatent Document 1] L. Kilian, et. al., J. Polymer Science, Part A, 2003, 30...

Claims

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