| abstract |
PROBLEM TO BE SOLVED: To provide an aqueous ink composition having a high concentration, high water resistance, good storage stability and excellent discharge stability in ink jet recording or the like. An aqueous ink composition containing at least two kinds of surface-treated pigments as a colorant, wherein the two kinds of surface-treated pigments are introduced directly or via a polyvalent group into the pigment surface. The surface-treated pigment is a surface-treated pigment in which the functional group introduced into the pigment surface is a carboxyl group, and the functional group introduced into the pigment surface is a sulfone group. A water-based ink composition containing a surface-treated pigment. [Selection figure] None |