The present invention is directed to a hair dyeing composition containing a dissociative azo dye of the following general formula (1)
A-N═N-B (1)
wherein “A” represents a phenyl or naphthyl group which may be substitued; “B” represents an atomic group containing a dissociative proton, with the proviso “A” and “B” are free of sulfo, carboxyl and 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 color and has less color fading over time.
本发明涉及一种染发组合物,该组合物含有以下通式(1)的离解型偶氮
染料
A-N═N-B (1)
其中 "A "代表可被取代的苯基或
萘基;"B "代表含有离解质子的原子团,但 "A "和 "B "不含磺基、羧基和季
铵基。此外,本发明还介绍了使用这种
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其鲜艳,并且随着时间的推移褪色较少。