| abstract |
PROBLEM TO BE SOLVED: To provide excellent flow characteristics, excellent ejection stability, specifically, good ink flight stability, stable ejection amount, and storage stability with less sedimentation for a long time. To provide an ink composition that is excellent in quality. SOLUTION: The ink composition according to the present invention measures the viscosity of a rolling ball system at 20 ° C. in an ink composition comprising at least a colorant, a water-soluble organic solvent, and water. The temperature condition, the inclination angle θ is performed while changing the predetermined angle, the viscosity at a predetermined predetermined angle is measured, the horizontal axis is sinθ, and the vertical axis is a sinθ-viscosity curve obtained by plotting as viscosity , The zero shear viscosity, which is the value of sin θ = 0 (θ = 0), is set to 3 to 10 mPa · s, and the gradient of the sin θ-viscosity curve is set to the range of −0.1 to 0. |