| 摘要 |
PROBLEM TO BE SOLVED: To provide a coloring fine-particle dispersoid excellent in the dispersion stability of coloring fine particles, excellent in color development and color tone and also excellent in water resistance and light stability without depending upon the kind of paper when printed in an optional paper, and suitable for water-based writing ink, water-based printing ink, information recording ink, etc. SOLUTION: This coloring fine-particle dispersoid comprises one or more kinds of polymers selected from the group consisting of a polyurethane, a polyester, a polyamide, a polyurea and a polycarbonate, and an oil-soluble dye represented by general formula I, e.g. formula D-18. Such a mode that each of the polymers has 0.01-3.0 mmol/g of a dissociative group, and the dissociative group is at least either of carboxyl group and sulfonic group, is preferable. |
