| 摘要 |
PROBLEM TO BE SOLVED: To obtain a direct dye resistant to various treatment to be applied to a keratinous material, especially keratin fiber such as hair, useful for the dyeing of the material and giving a dyeing composition having varied colors by using a specific dibenzene-type nitro compound. SOLUTION: The compound to be used in the objective dye is expressed by formula I [B is a linkage having a 1-14C alkyl chain; R1 to R3 and R1' to R3' 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; R7 is a 1-6C alkyl or the like; R8 to R10 are each a 1-6C alkyl, an aryl, benzyl or the like; R11 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; R4, R5, R4' and R5' are each H, a halogen, a 1-6C alkyl, an aryl or the like] (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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