The subject of the present invention is azo derivatives containing a pyrazolinone unit having the following formula (I), their mesomeric forms, their addition salts with an acid and their solvates and their use for dyeing keratin fibers. The subject of the invention is also a composition for dying keratin fibers comprising at least one azo derivative containing a pyrazolinone unit of formula (I) as direct dye, and the method for dyeing keratin fibers using this composition. The present invention makes it possible in particular to obtain chromatic colours that are resistant to the various attacks to which the hair may be subjected, in particular to shampoos and to light.
本发明的主题是含有以下式(I)的
吡唑啉酮单元的偶氮衍
生物,它们的共振式形式,它们与酸的加合盐以及它们的溶剂化物,以及它们用于染色角蛋白纤维的用途。本发明的主题还包括一种用于染色角蛋白纤维的组合物,其中至少包括一种含有式(I)的
吡唑啉酮单元的偶氮衍
生物作为
直接染料,以及使用该组合物染色角蛋白纤维的方法。本发明特别能够获得对头发可能遭受的各种攻击,特别是洗发
水和光线,具有耐久性的色彩。