| 摘要 |
PROBLEM TO BE SOLVED: To provide an ink for inkjet, using a pigment as a coloring matter, having good preservation stability, plugging resistance, jetting stability, intermittent printability, water resistance and weatherability, and capable of providing an image having a high image density without bleeding. SOLUTION: This ink is characterized in that the ink contains at least water, a pigment dispersoid and a water-soluble organic solvent, and is regulated so that (a) the conductivity at 25 deg.C may be 0.1-1.0 mS/m and (b) the acid or the base used as a counter ion of an ionic hydrophilic group of the pigment dispersoid may contain >40% acid or base having >=2 quotient of (a molar conductivity at 0.01 mol/l) divided by (a molar conductivity at 0.1 mol/l). |
