DISPERSING AGENT, METHOD FOR PRODUCING SAME, AND PIGMENT DISPERSION AND INK CONTAINING SUCH DISPERSING AGENT

摘要

Disclosed is a dispersing agent represented by the following general formula (1). Regarding A<SUP>1</SUP>-A<SUP>4</SUP>, two of them respectively represent a monovalent polymer moiety (P) and the other two respectively represent -C(=O)OH or -CH<SUB>2</SUB>C(=O)OH; one of them represents a monovalent polymer moiety (P) and the other three respectively represent -C(=O)OH or -CH<SUB>2</SUB>C(=O)OH; or one of them represents a monovalent polymer moiety (P), two of the other three respectively represent -C(=O)OH or -CH<SUB>2</SUB>C(=O)OH and the other one represents -C(=O)-X<SUP>a</SUP>-R<SUP>a</SUP>. X<SUP>1</SUP> represents a tetravalent group represented by the following general formula (2), (3) or (4).