- Patent Title: Azomethine direct dyes bearing at least one cationic charge, cosmetic composition comprising at least one such dye, implementation process therefor and use thereof
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Application No.: US16470155Application Date: 2017-12-15
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Publication No.: US10889718B2Publication Date: 2021-01-12
- Inventor: Stéphane Blais , Stéphane Sabelle , Aziz Fadli
- Applicant: L'Oreal
- Applicant Address: FR Paris
- Assignee: L'Oreal
- Current Assignee: L'Oreal
- Current Assignee Address: FR Paris
- Agency: Christensen O'Connor Johnson Kindness PLLC
- Priority: FR1662615 20161216
- International Application: PCT/EP2017/083112 WO 20171215
- International Announcement: WO2018/109192 WO 20180621
- Main IPC: A61Q5/10
- IPC: A61Q5/10 ; C09B55/00 ; A61K8/41 ; A61K8/49 ; A61Q5/06
Abstract:
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.
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