The present invention relates to symmetrical cationic diazo compounds of formula (I) below, their resonance forms, and also their acid addition salts and their solvates:
in which W
1
radicals, which are identical, represent a halogen atom or an —NR
4
—Ph—NR
5
R
6
, —NR
4
—Ph—OR
7
, —O—Ph—OR
7
or —O—Ph—NR
5
R
6
group;
L, a cationic linker connecting the two identical azo chromophores represents a C
2
-C
40
alkyl radical which carries at least one cationic charge and is optionally substituted and/or optionally interrupted by one or more, saturated or unsaturated (hetero)cycles; the linker L containing no azo, nitro, nitroso or peroxo bond.
The invention further relates to dyeing compositions comprising such compounds as a direct dye in a medium appropriate for the dyeing of keratin fibres, and also to a method of colouring keratin fibres that employs this composition, and a device having a plurality of compartments.
本发明涉及以下式(I)的对称阳离子重氮化合物及其共振式、酸加成盐和溶剂化物:其中W1基团相同,表示卤素原子或—NR4—Ph—NR5R6、—NR4—Ph—OR7、—O—Ph—OR7或—O—Ph—NR5R6基团;L表示连接两个相同的偶氮色团的阳离子连接基,表示一种C2-C40烷基基团,其带有至少一个阳离子电荷,并可选择地被一个或多个饱和或不饱和(杂)环所取代和/或中断;连接基L不含偶氮、硝基、亚硝基或过氧化物键。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,在适用于染色角蛋白纤维的介质中,以及使用该组合物染色角蛋白纤维的方法和具有多个隔间的装置。