The present invention relates to novel cationic 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: (I) (II) in which formula (I) or (II) X1, X2, R1, R2, R3, R4, R5, R6, n and n' are as defined in the description. The compounds of formula (I) 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.
本发明涉及一种新型的阳离子偶亚甲基
直接染料,
化学式为(I),以及其对应的还原形式,
化学式为(II),并且涉及其用于染色角蛋白纤维,特别是人类角蛋白纤维,如头发:(I) (II),其中
化学式(I)或(II)中的X1、X2、R1、R2、R3、R4、R5、R6、n和n'的定义如描述中所述。根据本发明的
化学式(I)的化合物可以提供强大、色彩丰富且具有良好上色效果的
颜料,能够抵抗角蛋白纤维可能遭受的各种攻击因素,如恶劣天气、光线、洗涤和汗
水。