| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a red pigment dispersion liquid for a writing implement ink which can prepare an oily red pigment for writing implement ink excellent in time-lapsed stability without increased viscosity of ink and aggregation and having a good writing property without thin handwriting and a blur. SOLUTION: A red pigment dispersion liquid for a writing implement ink contains an alcoholic organic solvent, a pigment dispersion resin dissolved in the organic solvent and a red pigment, diketopyrrolopyrrole dispersed in the organic solvent wherein a combination ratio (red pigment/resin) of the red pigment to the pigment dispersion resin is in the range of 0.5 to 5.</p> |
