| 摘要 |
A novel azo compound or its salt is provided to improve the color density, thereby obtaining the dyed product having a good quality even with using a small amount of a dye and reducing the cost. An azo compound is represented by the formula I, wherein R1 to R4 are independently H, a C1-C10 saturated aliphatic hydrocarbon group or a carboxyl group; R5 to R12 are independently H, a halogen atom, a C1-C10 saturated aliphatic hydrocarbon group, a halogenated C1-C10 saturated aliphatic hydrocarbon group, a C1-C8 alkoxy group, a carboxyl group, a sulfonyl group, a sulfamoyl group or an N-substituted sulfamoyl group; and R13 and R14 are independently H, a cyano group, a carbamoyl group or an N-substituted carbamoyl group.
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