BLOCK COPOLYMER AND METHOD FOR PRODUCING THE SAME, DISPERSANT AND PIGMENT DISPERSION COMPOSITION

• Main Author: MASUMOTO SATORU
• Format: Patent
• Language: English; Japanese
• Published: 08.12.2016
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To provide a block copolymer capable of providing a dispersion composition having excellent dispersion stability, for example, when used as a dispersant, and to provide a dispersant containing the block copolymer and a pigment dispersion composition using the same.SOLUTION: There is provided a block copolymer having an acid value of 30-250 mgKOH/g which comprises: an A block containing a structural unit derived from a vinyl monomer having two or more carboxyl groups at least two of which are bonded to mutually adjacent carbon atoms on the aromatic ring; and a B block containing a structural unit derived from a (meth)acrylic acid alkyl ester.SELECTED DRAWING: None 【課題】例えば分散剤として用いたときに、分散安定性が優れた分散組成物を与えることができる、ブロック共重合体、該ブロック共重合体を含有する分散剤及びそれを用いた顔料分散組成物を提供する。【解決手段】２個以上のカルボキシル基を有し、前記カルボキシル基の少なくとも２個が芳香環上の互いに隣接する炭素原子に結合したビニルモノマーに由来する構造単位を含むＡブロックと、（メタ）アクリル酸アルキルエステルに由来する構造単位を含むＢブロックとを有し、酸価が３０〜２５０ｍｇＫＯＨ／ｇであることを特徴としている。【選択図】なし