Dissymmetric azomethine direct dyes and process for their preparation, cosmetic composition comprising at least one such dye and use thereof
申请人:L'OREAL
公开号:US10927259B2
公开(公告)日:2021-02-23
The present invention relates to dissymmetric azomethine direct dyes of formula (I) and the leuco forms thereof of formula (II), and also to the use thereof for dyeing keratin fibres, in particular human keratin fibres such as the hair:
in which formula (I) or (II) R1, R2, R3, R4, R5, R6, n and n′ are as defined in the description.
The compounds of formula (I) or (II) according to the invention can give powerful, chromatic and sparingly selective colourings with good colour build-up, which are resistant to the various attacking factors to which keratin fibres may be subjected, such as inclement weather, light, washing and perspiration.
本发明涉及式 (I) 的不对称偶氮甲胺直接染料及其式 (II) 的白基形式,以及将其用于染色角蛋白纤维,特别是人类角蛋白纤维(如头发):
其中式(I)或(II)中的 R1、R2、R3、R4、R5、R6、n 和 n′如说明中所定义。
根据本发明的式 (I) 或 (II) 化合物可以提供强效、色度高、选择性少、具有良好着色力的着色剂,这些着色剂可以抵御角蛋白纤维可能受到的各种侵蚀因素,如恶劣天气、光线、洗涤和汗液。