| 摘要 |
PROBLEM TO BE SOLVED: To obtain an ink composition which can give a recording having high fastness to light and water by using a tetrasulfocopper phthalocyanine as the colorant. SOLUTION: This composition contains a compound of the formula as the colorant. In the formula, M is H, an alkali (alkaline earth) metal, an alkylamine or alkanolamine cation, or ammonium; and (a), (b), (c) and (d) each 0 or 1; provided that their sum is 1-4. If necessary, the composition may further contain Direct Blue 86 (R) and/or Direct Blue 87 (R) and/or Direct Blue 199 (R) and/or Acid Blue 9 (R). The composition is a water-base one in which the medium is water optiotrally containing at most 1 wt.% water-soluble organic solvent and/or inorganic salt. The colorant is produced, for example, by reacting 4- sulfophthalic acid or both 4-sulfophthalic acid and phthalic anhydride in a desired ratio under heating in the presence of a catalyst and a copper compound. |
