| abstract |
The present invention provides an aqueous pigment dispersion excellent in dispersion stability and excellent in ink ejection even when used as an ink for ink jet recording. The present invention relates to: [1] an aqueous pigment dispersion comprising a pigment (A), a cross-linked polymer (B) having a carboxyl group and an ethanolamine (C) having an alkyl group with a pKa of 8.7 or more; [2] a A kind of water-based ink, it contains this pigment water dispersion, organic solvent and surfactant; And [3] a kind of manufacture method of pigment water dispersion, it has: Step (1), it is to pigment (A), above-mentioned crossover A step of subjecting a mixture of a linking polymer, the above-mentioned ethanolamine (C), an organic solvent and water to a dispersion treatment to obtain a dispersion of polymer particles containing a pigment in which a crosslinking polymer adheres to a pigment (A); step (II), which removes the organic solvent from the resulting dispersion to obtain an aqueous dispersion of pigment-containing polymer particles; and step (III), which is further cross-linked with a cross-linking agent A step of obtaining a pigment aqueous dispersion containing the pigment-containing crosslinked polymer (B) particles by a linking treatment. |