A dye composition for keratinous fibers which contains a coupler and a developer are disclosed. The present coupler component is a novel 2-alkoxy-3,5-diaminopyridine derivative of the formula (1):
wherein R1 and R2 are the same or different from each other and independently represent a hydrogen atom, a lower alkanoyl group or a lower alkyl group which may be substituted by at least one hydroxyl group, and R3 is a lower alkyl group which may be substituted by at least one hydroxyl group, or a salt thereof; provided that R1 and R2 are not both a hydrogen atom or an acetyl group at the same time. The present 2-alkoxy-3,5-diaminopyridine derivatives are useful as couplers in dye compositions, and are capable of dyeing keratinous fibers such as hair in a bright blue color with excellent dyeability. Dye compositions containing the present compounds as a coupler show excellent resistance to discoloration, excellent resistance to shampooing and excellent resistance to friction.
本发明公开了一种用于角质纤维的
染料组合物,其中包含一种
偶联剂和一种显影剂。本
偶联剂成分是一种新型的 2-烷氧基-3,5-二
氨基
吡啶衍生物,其式为 (1):
其中 R1 和 R2 彼此相同或不同,并独立代表氢原子、低级烷酰基或可被至少一个羟基取代的低级烷基,R3 是可被至少一个羟基取代的低级烷基或其盐;条件是 R1 和 R2 不能同时代表氢原子或乙酰基。本发明的 2-烷氧基-3,5-二
氨基
吡啶衍生物可用作
染料组合物中的
偶联剂,能够将头发等角质纤维染成具有优异染色性的亮蓝色。含有本化合物作为
偶联剂的
染料组合物具有优异的抗褪色性、优异的抗洗发性和优异的抗摩擦性。