| abstract |
(57) [Summary] (Problem corrected) [Problem] To provide a method for producing a pigment dispersion liquid capable of realizing an ink composition having excellent ejection stability and capable of producing a good image, especially an image having excellent color reproducibility. . A pigment dispersion stock solution is prepared by dispersing a pigment in a solvent, the stock solution is subjected to a first-stage cross-flow membrane filtration, a solution that has not passed through the filtration membrane is collected, and the solution is subjected to a second step. A method for producing a pigment dispersion having an adjusted average particle diameter of a pigment, comprising subjecting the liquid having passed through the filter membrane to filtration through a cross-flow membrane in a step and collecting the liquid as a pigment dispersion. Here, the average pore size of the filter membrane of the first stage cross-flow membrane filtration is smaller than the average pore size of the filter membrane of the second stage cross-flow membrane filtration. |