The present invention concerns a new dissymmetrical cationic polyazo compounds of formula (I) Dye1-L-Dye2. The present invention also relates to dye compositions comprising such compounds as direct dye in a medium that is suitable for dyeing keratin fibres, and also to a process for dyeing keratin fibres using this composition and a multi-compartment device. The present invention provides direct dyes with which strong and varied shades that are resistant to external attacking factors such as bad weather and shampooing, for which there is no observation of any problem of change in colour over time.
本发明涉及一种新的非对称阳离子聚偶氮化合物,其
化学式为(I)Dye1-L-Dye2。本发明还涉及包含此类化合物作为
直接染料的
染料组合物,在适合用于染色角蛋白纤维的介质中,并且涉及使用该组合物和多室装置染色角蛋白纤维的方法。本发明提供了
直接染料,其具有强烈和多样的色调,能够抵抗外部侵袭因素,如恶劣天气和洗发
水,且随着时间的推移,没有观察到颜色变化问题。