SYMMETRIC AZOMETHINE DIRECT DYES, PROCESS FOR THEIR PREPARATION, COSMETIC COMPOSITION COMPRISING AT LEAST ONE SUCH DYE AND USE THEREOF
申请人:L'OREAL
公开号:US20220016009A1
公开(公告)日:2022-01-20
The present invention relates to a process for dyeing keratin fibres, in particular human keratin fibres such as the hair, in one or more steps, comprising the application to said keratin fibres of a composition comprising one or more compounds of formula (I) and/or (II), and also to the use thereof for dyeing keratin fibres, and to a device: in which formula (I) or (II) R
1
, R
3
, R
4
, R
5
, R
6
, 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.