| 摘要 |
<p>An inkjet recording ink comprises an aqueous medium having a dye (I) dissolved or dispersed in it. The total amount of cations in the ink except for a lithium ion, a hydrogen ion, an ammonium ion, an organic quaternary nitrogen ion and an ion produced by the proton addition to a nitrogen atom in a basic organic material, is = 0.5 wt.%. An inkjet recording ink comprises an aqueous medium having dissolved or dispersed in it a dye of formula (I). The total amount of cations in the ink except for a lithium ion, a hydrogen ion, an ammonium ion, an organic quaternary nitrogen ion and an ion produced by proton addition to a nitrogen atom in a basic organic material, is =0.5 wt.%. [Image] X1, X2, X3, X4-SO-Z, -SO2-Z, -SO2NR1R2, a sulfo group, -CONR1R2 or -CO2R1; Z : an (optionally substituted) alkyl, cycloalkyl, alkenyl, aralkyl, aryl or heterocyclic; R1, R2a hydrogen atom, an (optionally substituted) alkyl, cycloalkyl, alkenyl, aralkyl, aryl or heterocyclic; Y1, Y2, Y3, Y4a monovalent substituent; a1, a2, a3, a40-4, but not 0 at the same time; b1, b2, b3, b40-4; M : a hydrogen atom, a metal atom, or its oxide, hydroxide or halide. When Zs are present, thy may be the same or different. When multiple X and Y are present, they may be the same or different.</p> |
