| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a color-changeable writing ink composition capable of easily changing the color of the ink by an eraser, and having abrasion resistance by a finger, and further to provide a writing utensil including the ink composition. SOLUTION: This color-changeable writing ink composition includes adhesive colored resin particles comprising a pigment and an adhesive resin, having the surfaces at least a part of which has adhesion, and further having a particle size distribution including >=70 wt.% particles within the range of 2-20μm particle diameter, and a dye and/or colored particles having 0.01-2.0μm particle diameters. In another embodiment, the color-changeable writing ink composition includes the colored resin particles including the pigment, the adhesive resin granules, and the dye and/or the colored particles having 0.01-2.0μm particle diameters, and has a particle size distribution of the colored resin granules and the adhesive resin granules including >=70 wt.% particles within the range of 2-20μm particle diameter. The writing utensil includes the ink composition.</p> |
