Water-based pigment dispersion for ink-jet recording, ink composition for ink-jet recording and method of producing the same

A method of producing a water-based pigment dispersion for ink-jet ink, comprising:

• a kneading process for kneading a mixture containing a styrene-based resin, a quinacridone-based pigment, a phthalimidomethylated quinacridone-based compound, an alkali metal hydroxide and a humectant to produce a solid and colored kneaded mixture;
• and
• a dispersing process for dispersing the solid and colored kneaded mixture in an aqueous medium, wherein
• the styrene-based resin has 60% by mass or more of a styrene-based monomer unit based on all monomer components, a monomer unit containing an unsaturated aliphatic carboxylic acid having a radical polymerizable double bond, an acid value of 50 to 300 and a weight-average molecular weight of 7500 to 40000.