| abstract |
(57) [Summary] [Constitution] A pigment ink composition comprising a condensate of formaldehyde and toluenesulfonamide, a polyhydric alcohol such as ethylene glycol and diethylene glycol monoethyl ether, a polyhydric alcohol derivative, a dispersant and a pigment. [Effect] There is provided a pigment ink using a polyhydric alcohol or a polyhydric alcohol derivative as a solvent, which provides a drawn line having excellent water resistance when used for a writing instrument, a stamp stand, or the like. |