The present invention is directed to a hair dyeing composition comprising an azo dye of the following general formula (I)A - N = N - B 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,包括以下通用式(I)A - N = N - B的偶氮
染料,其中A = 通过碳原子与偶氮基结合的一价的、可选地取代的杂环基团,不含羧基(-CO2H)或
磺酸基(SO3H)或季
铵基团;B = 含有可解离质子的杂环、芳香或烷基团,且不含羧基(-CO2H)或
磺酸基(-SO3H)或季
铵基团。此外,本发明描述了一种通过使用这种
染料来染色人类或动物头发的方法,以及使用这种直接偶氮
染料来染色人类或动物头发。使用这种直接偶氮
染料可以使头发呈现极为鲜艳的颜色,并且随着时间的推移,颜色褪色较少。