| abstract |
PROBLEM TO BE SOLVED: To provide a pigment water dispersion which is excellent in water resistance of a recorded matter and storage stability of the ink while maintaining redispersibility of a dry ink in an ink ejection nozzle by using it in an aqueous ink, and its production. Provide methods etc. SOLUTION: This is a pigment water dispersion containing water-insoluble crosslinked polymer A particles containing a pigment, a water-soluble base compound, and water, wherein the water-insoluble crosslinked polymer A constituting the particles contains a carboxy group. And a polymer having a crosslinked structure containing an ester group derived from a water-insoluble crosslinking agent, wherein the polymer A is a polymer obtained by subjecting a water-insoluble polymer A′ having a carboxy group to a crosslinking treatment, and the polymer A′ is a carboxy group. Having a constitutional unit derived from a contained monomer and a constitutional unit derived from a hydrophobic monomer, the saponification value of the polymer A is 170 to 300 mgKOH/g, the basic compound contains a water-soluble amine compound, and the amine compound Is an alkanolamine having 2 to 8 carbon atoms, a pigment water dispersion, a method for producing the same, and the like. [Selection diagram] None |