| 摘要 |
<p>PURPOSE: To obtain a water-color ink having excellent discharging reliability and useful for a water-based writing tool or a pen plotter, etc., by including a coloring agent dispersible or soluble in water, water, an wetting agent and a specific chitosan derivative. CONSTITUTION: The water-color ink mainly composed of (A) a coloring agent dispersible or soluble in water (especially an acidic dye or a direct dye, etc., is preferable), (B) water and (C) a wetting agent contains (D) a chitosan derivative of formula I [D is a dye skeleton, preferably a xanthene-based dye skeleton of formula II (A is -SO2 - or-CO-; X is -SO3 <-> or -COO<-> ; R1 and R2 are each H, an alkyl or a halogen; (m) and (n) are each 0 or 1 not simultaneously 0) or a phthalocyanine-based dye skeleton of formula III (M is an alkali metal or an alkanolamine, etc.; Z is H, Cu or Ni, etc.; (n) is a natural number, (q) is an integer except 0 and 0<(p+q)<5), etc.</p> |
