L'oreal

Loreal Sa

Stéphane Blais

Aziz Fadli

Stéphane Sabelle

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, R, R, R, R, 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. 

Symmetric azomethine direct dyes, process for their preparation, cosmetic composition comprising at least one such dye and use thereof

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) R, R, R, R, R, R, 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.

Dissymmetric azomethine direct dyes and process for their preparation, cosmetic composition comprising at least one such dye and use thereof

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) X, X, R, R, R, R, R, R, 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. 

Azomethine direct dyes bearing at least one cationic charge, cosmetic composition comprising at least one such dye, implementation process therefor and use thereof

The subject of the present invention is symmetric or dissymetric azomethine direct dyes comprising at least one pyrazolopyridine unit of formula (I), a composition comprising said dyes, a process for treating keratin fibers using said dyes, a process for preparing these compounds, synthesis intermediates and a kit. In which formula (I) X, Y, Y, Z, and Rto Rare as defined in the description. 

(Dis)symmetric azomethine-type direct dye comprising at least one pyrazolopyridine unit, process for dyeing keratin fibers using this dye

The invention relates to a 1,2,3,4-tetrahydropyrido[2,3-b]pyrazin-7-amine compound of formula (I) below, addition salts thereof, optical isomers, geometrical isomers and tautomers thereof and/or solvates thereof: in which: .R, R, R, R, and Rindependently represent: a hydrogen or halogen atom; a C-Calkyl radical; a C-Chydroxyalkyl radical; a carboxyl radical; a (C-C)alkoxycarbonyl radical; .R1 and R6, which may be identical or different, represent: hydrogen atom; C-Cand preferably Ci-C6 alkyl radical,&#x2014;optionally interrupted with one or more heteroatoms chosen from O and S or with one or more groups&#x2014;NR and/or&#x2014;optionally terminating with at least one group&#x2014;NXXor at least one group &#x2014;OX, .Xand X2 independently denote&#x2014;a hydrogen atom, a linear C-Calkyl radical, a branched C-Calkyl radical, a linear C-Chydroxyalkyl radical or a branched C-Chydroxyalkyl radical, X1 and X2 may form, with the nitrogen atom that bears them, a saturated or unsaturated 5- to 8-membered heterocycle, in which one of the ring members may be a heteroatom chosen from O, S and N; the said heterocycle possibly being substituted with one or more linear or branched C-Calkyl or C-Chydroxyalkyl radicals, .X3 denotes&#x2014;a hydrogen atom&#x2014;a linear C1-C4 or branched C3-C4 alkyl radical, and .R denotes&#x2014;a hydrogen atom&#x2014;a linear C1-C4 alkyl radical. 

Dye composition comprising a 1,2,3,4-tetrahydropyrido[2,3-b]pyrazin-7-amine compound

Provided herein is a method for dyeing keratin fibers, comprising applying to the keratin fibers, at least one composition comprising at least one compound chosen from compounds of leuco type of formula (I), dyes of azomethine type containing a pyrazolopyridine unit of formula (II) corresponding to the compounds of formula (I), mesomeric forms, isomers and tautomers thereof, and also acid-addition salts thereof and solvates thereof: 

Method for dyeing keratin fibers using at least one compound of azomethine type comprising a pyrazolopyridine unit

Disclosed herein is at least one compound chosen from compounds of leuco type of formula (I), dyes of azomethine type comprising a pyrazolopyridine unit of formula (II) corresponding to the compounds of formula (I), mesomeric forms, isomeric and tautomeric forms thereof, acid-addition salts thereof and solvates thereof: 

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Aulnay-sous-Bois, France

Stéphane Blais