Abstract: The present invention relates to the use of one or more particular pyridinium salts for the treatment of keratin substances, particularly human keratin fibres such as hair. The invention also relates to a method for the treatment of keratin substances using said salts and optionally one or more chemical oxidizing agents. The invention also relates to a composition for lightening keratin substances comprising one or more pyridinium salts as defined hereinafter and one or more chemical oxidizing agents. The present invention also relates to one or more particular pyridinium salts and also to compositions containing them, especially compositions comprising a physiologically acceptable medium.

Abstract: 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, Y1, Y2, Z1, and R1 to R5 are as defined in the description.

Abstract: 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) R1, R2, R3, R4, R5, R6, 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.

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.

Abstract: 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, Y1, Y2, Z1, and R1 to R5 are as defined in the description.

Abstract: The present invention relates to a composition for dyeing keratin fibers, in particular human keratin fibers such as the hair, comprising one or more fatty substances, one or more surfactants, one or more oxidation bases chosen from para-phenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, ortho-aminophenols and the addition salts thereof and/or solvates thereof one or more particular couplers of meta-phenylenediamine type substituted in position 4, and one or more basifying agents, the fatty substance content in the dye composition representing in total at least 10% by weight relative to the total weight of the said composition. The invention also relates to a dyeing process using such a composition, and also to multi-compartment devices suitable for performing the said process.

Abstract: The present invention relates to the use of one or more particular dihydroisoquinolinium salts of formula (I) for treating keratin materials, in particular keratin fibres, especially human keratin fibres such as the hair. The invention also relates to a process for treating keratin materials using said salts and optionally one or more chemical oxidizing agents. A subject of the invention is also a composition for lightening keratin materials, comprising one or more dihydroisoquinolinium salts and one or more chemical oxidizing agents. The present invention also relates to one or more particular dihydroisoquinolinium salts and also to compositions containing them, in particular compositions comprising a physiologically acceptable medium.

Abstract: Use of dihydroisoquinolinium salts for treating keratin materials, compositions and implementation processes The present invention relates to the use of one or more dihydroisoquinolinium salts for treating keratin materials, in particular keratin fibres, especially human keratin fibres such as the hair. The invention also relates to a process for treating keratin materials using said salts and optionally in the presence of one or more chemical oxidizing agents. A subject of the invention is also a composition for lightening keratin materials, comprising one or more dihydroisoquinolinium salts as defined below and one or more chemical oxidizing agents.

Abstract: The present invention relates to the use of one or more dihydroisoquinolinium double salts for treating keratin materials, in particular keratin fibres, especially human keratin fibres such as the hair. The invention also relates to a process for treating keratin materials using said salts and optionally in the presence of one or more chemical oxidizing agents. A subject of the invention is also a composition for lightening keratin materials, comprising one or more dihydroisoquinolinium double salts as defined below and one or more chemical oxidizing agents. The present invention also relates to one or more particular dihydroisoquinolinium double salts and also to compositions containing them, in particular compositions comprising a physiologically acceptable medium.

Abstract: The present invention relates to the use of one or more particular pyridinium salts for the treatment of keratin substances, particularly human keratin fibres such as hair. The invention also relates to a method for the treatment of keratin substances using said salts and optionally one or more chemical oxidizing agents. The invention also relates to a composition for lightening keratin substances comprising one or more pyridinium salts as defined hereinafter and one or more chemical oxidizing agents. The present invention also relates to one or more particular pyridinium salts and also to compositions containing them, especially compositions comprising a physiologically acceptable medium.

Abstract: The present invention relates to a composition for dyeing keratin fibers, in particular human keratin fibers, comprising one or more fatty substances, one or more surfactants, one or more oxidation bases, one or more particular couplers of meta-phenylenediamine type substituted in position 2, and one or more basifying agents, the fatty substance content in the dye composition representing in total at least 5% by weight relative to the total weight of the said composition. The invention also relates to a dyeing process using such a composition, and also to multi-compartment devices suitable for performing the said process.

Abstract: The present invention relates to azomethine-type direct dyes having a triaromatic unit of formula (I) below: and also the use thereof for dyeing keratin fibers, in particular human keratin fibers such as the hair. The invention also relates to a composition for dyeing keratin fibers, comprising, in a medium suitable for dyeing, such direct dyes. Another subject of the present invention is a method for dyeing keratin fibers using said dye composition. Finally, the present invention also relates to precursors of these direct dyes.

Abstract: A subject-matter of the invention is a) a method for dyeing keratinous substances starting from a dyeing agent chosen from coloured oligomers and polymers obtained from the polycondensation of i) meta-phenylenediamine (MPD) couplers in the presence of ii) one or more ingredients chosen from radical initiators and/or chemical oxidizing agents, b) a composition comprising one or more coloured oligomers and/or one or more coloured polymers as defined above and c) a coloured oligomeric or polymeric dyeing agent obtained by reaction between i) and ii) as defined above, and the use of the coloured oligomer(s) or polymer(s) for dyeing keratinous substances. The dyeing method and the composition according to the invention make it possible in particular to obtain a long-lasting colouration on keratinous fibres which is vivid, chromatic and/or homogeneous.

Abstract: The present invention relates to azomethine-type direct dyes with a tri-aromatic unit having the following formula (I): and their use for coloring keratin fibers, particularly human keratin fibers such as the hair. The invention also relates to a composition for dyeing keratin fibers comprising, in a suitable medium for dyeing, such direct dyes. Another subject of the present invention is a method for dyeing keratin fibers using said dyeing composition. Finally the present invention also relates to precursors for these direct dyes.

Abstract: The present invention relates to quinone direct dyes of formula (I) below, organic or mineral acid or base salts thereof, tautomeric forms, optical isomers or geometrical isomers thereof and/or solvates thereof: and also to the use thereof for dyeing keratin fibers, in particular human keratin fibers such as the hair. The invention also relates to a composition for dyeing keratin fibers, comprising such direct dyes in a suitable dyeing medium. Similarly, a subject of the present invention is a process for dyeing keratin fibers, using the said dye composition.

Abstract: The present invention relates to direct dyes of azomethine type of formula (I) below; and also to the use thereof for dyeing keratin fibers, in particular human keratin fibers such as the hair. The invention also relates to a composition for dyeing keratin fibers, comprising such direct dyes in a suitable dyeing medium. Similarly, a subject of the invention is a process for dyeing keratin fibers using the said dye composition, and also a device comprising the same. Finally, the present invention also relates to precursors of these direct dyes.

Abstract: The present invention relates to a composition for dyeing keratin fibres, in particular human keratin fibres, comprising one or more fatty substances, one or more surfactants, one or more oxidation bases, one or more particular couplers of meta-phenylenediamine type substituted in position 2, and one or more basifying agents, the fatty substance content in the dye composition representing in total at least 5% by weight relative to the total weight of the said composition. The invention also relates to a dyeing process using such a composition, and also to multi-compartment devices suitable for performing the said process.

Abstract: The present invention relates to a composition for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising one or more fatty substances, one or more surfactants, one or more oxidation bases chosen from para-phenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, ortho-aminophenols and the addition salts thereof and/or solvates thereof one or more particular couplers of meta-phenylenediamine type substituted in position 4, and one or more basifying agents, the fatty substance content in the dye composition representing in total at least 10% by weight relative to the total weight of the said composition. The invention also relates to a dyeing process using such a composition, and also to multi-compartment devices suitable for performing the said process.

Abstract: The present invention relates to azomethine-type direct dyes having a triaromatic unit of formula (I) below: and also the use thereof for dyeing keratin fibres, in particular human keratin fibres such as the hair. The invention also relates to a composition for dyeing keratin fibres, comprising, in a medium suitable for dyeing, such direct dyes. Another subject of the present invention is a method for dyeing keratin fibres using said dye composition. Finally, the present invention also relates to precursors of these direct dyes.

Abstract: The present invention relates to azomethine-type direct dyes with a tri-aromatic unit having the following formula (I): and their use for colouring keratin fibres, particularly human keratin fibres such as the hair. The invention also relates to a composition for dyeing keratin fibres comprising, in a suitable medium for dyeing, such direct dyes. Another subject of the present invention is a method for dyeing keratin fibres using said dyeing composition. Finally the present invention also relates to precursors for these direct dyes.