| abstract |
A water-insoluble colorant dispersion prepared by a production method including a step of codissolving a water-insoluble colorant and a polymer compound having one or more acid groups selected from carboxylic acid group, sulfonic acid group and phosphoric acid group as hydrophilic group in an organic solvent in the presence of a phase-transfer base represented by the Formula (I) or (II), and mixing the obtained solution with an aqueous medium; characterized by containing water-insoluble colorant fine particles, a polymer compound having one or more acid groups selected from the group consisting of carboxylic acid group, sulfonic acid group and phosphoric acid group as hydrophilic group, an aqueous medium, and a phase-transfer base represented by the Formula (I) or (II): n n n n n n n n n n wherein R 1 to R 5 each independently represents a methyl, ethyl or propyl group, n represents an integer of 1 to 4. |