ACRYLIC STAR POLYMER

WIPO Patent Application WO/2005/116098

A1

An acrylic-acid-based star polymer which has a narrow molecular weight distribution and a controlled structure and is degradable with an acid. The star polymer comprises: a core part which is a polymer chain having repeating units derived from a polyacrylate having at least two partial structures represented by the formula (I): [Chemical formula 1] (wherein R₁ represents hydrogen or methyl; R₂ and R₃ each independently represents an organic group bonded through a carbon atom; and carbon C1 represents a carbon atom which is bonded to another part through a carbon atom); and arm parts which each is a polymer chain having repeating units derived from a (meth)acrylic ester represented by the formula (II): [Chemical formula 2] (wherein R₄ represents hydrogen or methyl and R₅ represents an organic group), provided that when R₁ in the formula (I) is methyl, the polymer chain is not a homopolymer chain having repeating units derived from a (meth)acrylic ester wherein R₅ is C_1-4 alkyl.

MATSUMOTO HITOSHI (JP)
NAKAMURA MITSUHIRO (JP)

PCT/JP2005/009943

December 08, 2005

May 31, 2005

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NIPPON SODA CO (JP)
MATSUMOTO HITOSHI (JP)
NAKAMURA MITSUHIRO (JP)

C08F293/00; C08F297/02; (IPC1-7): C08F297/02

WO1996023012A1

1996-08-01

JPH05500827A	1993-02-18
JPH01131221A	1989-05-24

KILIAN L. ET AL: "Synthesis and cleavage of core-labile poly(Alkyl Methacrylate) star polymers", J. POLYMER SCIENCE, vol. PART A, 19 August 2003 (2003-08-19), pages 3083 - 3093, XP002994509
See also references of EP 1752479A4

Shiga, Masatake (Yaesu Chuo-k, Tokyo 53, JP)

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