Disclosed is a water-based black ink composition which exhibits a low intensity, colorless and neutral black color and provides a black recorded image the printed image of which has high density. The ink composition comprises at least one compound represented by the formula (1) or a salt thereof as a pigment (I) and an azo compound having λmax within the range of 550-660 nm as a pigment (II). In the formula (1), R1 to R8 independently represent a hydrogen atom; a halogen atom; a sulfo group; a carboxy group; a sulfamoyl group; a carbamoyl group; a C1-C4 alykyl group; a C1-C4 alkoxy group; and a C1-C4 alkoxy group, or the like substituted with at least one group selected from a group consisting of a hydroxy group, a C1-C4 alkoxy group, a hydroxy C1-C4 alkoxy group, a sulfo group and a carboxy group. X represents a bivalent cross-linking group.
本发明公开了一种
水基黑色油墨组合物,该组合物显示出低浓度、无色和中性的黑色,并提供黑色记录图像,其印刷图像具有高密度。该油墨组合物包含至少一种由式(1)表示的化合物或其盐作为
颜料(I),以及一种λmax 在 550-660 纳米范围内的偶氮化合物作为
颜料(II)。在式 (1) 中,R1 至 R8 独立地代表氢原子、卤素原子、磺基、羧基、
氨基磺酰基、
氨基甲酰基、C1-C4 烷基、C1-C4 烷氧基和 C1-C4 烷氧基,或被至少一个选自羟基、C1-C4 烷氧基、羟基 C1-C4 烷氧基、磺基和羧基的基团取代的类似基团。X 代表二价交联基团。