| abstract |
[PROBLEMS] To provide a high water storage stability suitable for long-term storage at high temperatures, high ejection stability when using an ink-jet printer, and excellent color development and fixability regardless of the type of recording medium. Ink compositions are desired. An aqueous ink composition comprising a colorant, a resin emulsion, a humectant, and water, wherein the colorant directly and / or multivalently contains at least one hydrophilic dispersibility-imparting group. A surface-treated pigment introduced on the pigment surface through a group, and heated at a temperature equal to or higher than the glass transition temperature (Tg) of the resin component constituting the resin emulsion before the resin emulsion is added to the aqueous ink composition. A water-based ink composition characterized by being treated. [Selection figure] None |