| abstract |
PROBLEM TO BE SOLVED: To provide a pigment derivative and a pigment dispersant capable of preventing aggregation of pigments in aqueous and non-aqueous vehicles, and to provide an aqueous ink using the same. [Solution] It is a pigment derivative comprising a compound of the following general formula (I), or a metal salt, ammonium salt or amine salt thereof. In the formula, Q is an organic dye residue having an aromatic ring, A is an ethylene group, a phenylene group or a naphthylene group and may contain a substituent, and R is a hydroxyl group or —NH—AZ Z represents a group represented by —SO 3 H or —COOH, and n represents an integer of 1 to 4. [Chemical 1] [Selection figure] None |