A dye which, in the free acid form, has the formula
wherein
W is COOH
X is selected from H, COOH, SO₃H, halo, hydroxy, nitro, cyano, C₁₋₆-alkyl, C₁₋₆-alkoxy and C₁₋₆-acylamino;
Y is H, COOH or SO₃H;
Z is H, COOH or SO₃H;
R & R¹ are each independently H or C₁₋₆-alkyl substituted by 0, 1 or 2 -COOR² groups; and
R² is H or C₁₋₆-alkyl;
provided that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO₃H groups.
The dye is adapted for the preparation of inks for use in ink jet printing in which it displays high water-fastness on paper.
游离酸形式的
染料,其
化学式为
其中
W 是 COOH
X 选自 H、COOH、SO₃H、卤素、羟基、硝基、
氰基、C₁₋₆-烷基、C₁₋₆-烷氧基和 C₁₋₆-酰
氨基;
Y 是 H、COOH 或 SO₃H
Z 是 H、COOH 或 SO₃H;
R 和 R¹ 各自独立地为 H 或被 0、1 或 2 个 -COOR² 基团取代的 C₁₋₆ 烷基;以及
R² 是 H 或 C₁₋₆-烷基;
至少有两个 COOH 基团,且 COOH 基团的数目等于或大于 SO₃H 基团的数目。
该
染料适用于制备喷墨印刷用油墨,在纸张上具有很高的耐
水性。