| 摘要 |
<p>PURPOSE:To provide the titled ink capable of preventing the clogging of a nozzle with a phthalocyaninesulfonic acid dye, and having excellent water-resistance, light-resistance and jet stability, and containing plural dyes each represented by a specific structural formula and having different central metallic atom, as water-soluble dyes. CONSTITUTION:The objective ink contains (A) two or more dyes represented by formula (X is Cu, Co, Ni, or Zn; M is alkali metal ion, amine ion, or ammonium ion; n is 2-4) and having different central metallic atom from each other, as water-soluble dyes, and (B) water, a water-soluble organic solvent, a wetting agent and an antiseptic mildewproofing agent, as main components, and further contains a pH-modifier to keep the pH of the ink at 9.0-11.0 (e.g. diethanolamine). The above dye is preferably a combination of a tri- and/or tetrasulfonic acid salt of copper phthalocyanine as a main dye and a tri- and/or tetrasulfonic acid salt of nickel phthalocyanine as a subsidiary dye, wherein the weight ratio of the main dye: subsidiary dye is 1:(0.001-1).</p> |
