| 摘要 |
PROBLEM TO BE SOLVED: To provide an ink composition for ink jet recording which effectively prevents deposits from occurring and has physical properties satisfying, to a high level, requirements of such an ink composition by specifying the free copper ion concentration of an ink composition for ink jet recording containing a copper complex colorant. SOLUTION: A copper complex colorant and a sequestering agent are compounded into a solvent comprising water and an organic solvent so that the free copper ion concentration is 10 ppm or lower. A copper phthalocyanine dye or a copper phthalocyanine pigment of the formula (wherein X is Cl, Br, or H; and n is 14-16) is preferable. This ink composition for ink jet recording may further contain a rust preventive, an antimildew agent, a penetrating solvent and/or a surfactant, a wetting agent, a saccharide, etc. Preferably, the content of the copper complex colorant in the ink composition is 0.1-20 wt.% in the case of a copper complex dye and is 1-10 wt.% in the case of a copper phthalocyanine pigment. |
