AZO COMPOUND, INK COMPOSITION, RECORDING METHOD AND COLORED MATERIAL

摘要

Provided are: a dye which exhibits extremely excellent (ozone) gas resistance, extremely high print density, low color rendering properties, low color saturation, and high-quality black hue when is recorded on a paper only for inkjet printing purposes, i.e., an azo compound represented by formula (1), a tautomer of the azo compound, or a salt of the azo compound or the tautomer; and an ink composition containing the dye, particularly a black ink composition for inkjet recording applications. In the formula, R1 represents a (C1-C4) alkyl group, or the like; R2 represents a cyano group, or the like; R3 and R4 independently represent a hydrogen atom, a sulfo group, a (C1-C4) alkoxy group, or the like; R5 and R7 independently represent a (C1-C4) alkylthio group, or the like; R6 and R8 independently represent a (C1-C4) alkylcarbonylamino group; R9 and R10 independently represent a (C1-C4) alkoxy group, or the like; and R11 to R13 independently represent a hydrogen atom, a sulfo group, or the like.