The present invention is directed to a hair dyeing composition comprising at least one azo dye of the following general formula (1):
A - N = N - B (1)
where A = monovalent, optionally substituted heterocyclic group binding via the carbon atom to the azo group, that does not contain carboxy (-CO2H) or sulfo groups (SO3H) or quaternary ammonium groups and B = heterocyclic, aromatic or alkyl group containing a dissociative proton and, which is free of carboxy (-CO2H) or sulfo groups (-SO3H) or quaternary ammonium groups. Additionally, the present invention describes a method of dyeing human or animal hair by using such a dye and the use of this direct azo dye for dyeing human or animal hair. The use of this direct azo dye can impart the hair with an extremely vivid colour and has a less colour fade over the time.
本发明涉及一种染发组合物,该组合物包含至少一种如下通式(1)的偶氮
染料:
a - n = n - b (1)
其中,A=通过碳原子与偶氮基结合的单价、任选取代的杂环基,不含羧基(-CO2H)或磺基(SO3H)或季
铵基;B=含有离解质子的杂环基、芳香基或烷基,不含羧基(-CO2H)或磺基(-SO3H)或季
铵基。此外,本发明还描述了使用这种
染料染人或动物毛发的方法,以及使用这种直接偶氮
染料染人或动物毛发的方法。使用这种直接偶氮
染料可使毛发的颜色极为鲜艳,而且随着时间的推移褪色较少。