| abstract |
An aqueous pigment dispersion having excellent ejection stability, long-term storage stability, and clogging reliability is provided. An aqueous pigment dispersion comprising a pigment dispersion containing a pigment and a sulfonic acid-based polymerizable surfactant adsorbed on the pigment, A step of pulverizing and mixing a mixture of a pigment, a sulfonic acid-based polymerizable surfactant, and an aqueous medium to obtain an aqueous dispersion, and treating the aqueous dispersion in the presence of peroxodisulfate, A step of obtaining a modified aqueous dispersion, and a step of treating the modified aqueous dispersion with ultrafiltration until the concentration of the dissolved component of the sulfonic acid-based polymerizable surfactant in the aqueous medium is less than 10 ppm. An aqueous pigment dispersion obtained by a production process including the same. [Selection figure] None |