| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a water-based ink that secures dispersion stability of pigment in a water-based ink, has excellent chroma and transparency in an obtained color image and is suitable for ink-jet suitability. <P>SOLUTION: In the method for producing a water-based pigment dispersion for ink-jet recording comprises mixing at least pigment, a dispersion resin and an aqueous medium containing a water-soluble organic solvent with stirring and removing the water-soluble organic solvent to give a water-based pigment dispersion containing a microcapsule pigment obtained by coating the surface of the pigment with the dispersion resin, pigment and an aqueous medium in which relation between the solubility parameter (A) of the pigment and the solubility parameter (B) of the aqueous medium is in the range of 0.95≤B/A≤1.17 and the solubility parameter (A) of the pigment is in the range of 13.5≤A≤19.5 are used as the pigment and aqueous medium. <P>COPYRIGHT: (C)2007,JPO&INPIT |
