| 摘要 |
PROBLEM TO BE SOLVED: To obtain a direct dye having resistance useful for the dyeing of a keratinous material, especially keratin fiber such as hair and giving improved color tone compared with conventional cationic nitroaniline compound by using a specific monobenzene-type nitroaniline compound. SOLUTION: The compound to be used in the dye is expressed by formula I [R1 to R4 are each H, an unsaturated cationic group of formula II or III, a saturated cationic group of formula IV (D is a linkage having a 1-14C alkyl chain; E, G, J, L and M are each C, O, S or N; (n) is 0-4; (m) is 0-5; R is a halogen or the like; R6 is a 1-6C alkyl or the like; R7 to R9 are each a 1-6C alkyl, an aryl, benzyl or the like; R10 is an aryl or the like; (x) and (y) are each 0 or 1; X is a univalent or bivalent anion), a 1-6C alkyl or the like; R3 and R4 are each H, a halogen or the like; R5 is H or a 1-6C alkyl] (e.g. the compound of formula V). A dyeing composition useful as a direct dye can be produced by including the compound of formula I in an amount of 0.005-12 wt.%.
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