Bleaching and dyeing; fluid treatment and chemical modification – Using enzymes – dye process – composition – or product of dyeing
Patent
1999-05-21
2000-07-18
Liott, Caroline D.
Bleaching and dyeing; fluid treatment and chemical modification
Using enzymes, dye process, composition, or product of dyeing
8406, 8407, 8408, 8409, 8410, 8411, 8412, A61K 713
Patent
active
060901594
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a composition for the oxidation dyeing of keratin fibres, and in particular of human keratin fibres such as the hair, this composition comprising, in a medium which is suitable for dyeing, at least one oxidation base, sarcosine oxidase, and at least one donor for the said sarcosine oxidase, as well as to the dyeing process using this composition.
It is known to dye keratin fibres, and in particular human hair, with dye compositions containing oxidation dye precursors, in particular ortho- or para-phenylenediamines, ortho- or para-aminophenols and heterocyclic bases which are generally referred to as oxidation bases. Oxidation dye precursors, or oxidation bases, are colourless or weakly coloured compounds which, when combined with oxidizing products, can give rise to coloured compounds and dyes by a process of oxidative condensation.
It is also known that the shades obtained with these oxidation bases can be varied by combining them with couplers or colour modifiers, the latter being chosen in particular from aromatic meta-diamines, meta-aminophenols, meta-diphenols and certain heterocyclic compounds.
The variety of compounds used as regards the oxidation bases and the couplers allows a wide range of colours to be obtained.
The so-called "permanent" coloration obtained by means of these oxidation dyes must moreover satisfy a certain number of requirements. Thus it must have no toxicological drawbacks, it must be able to give shades of the desired intensity and it must be able to withstand external agents (light, bad weather, washing, permanent-waving, perspiration, rubbing).
The dyes must also be able to cover white hair and, lastly, they must be as unselective as possible, i.e. they must give the smallest possible colour differences along the same length of keratin fibre, which may in fact be differently sensitized (i.e. damaged) between its tip and its root.
The oxidation dyeing of keratin fibres is generally carried out in alkaline medium, in the presence of hydrogen peroxide. However, the use of alkaline media in the presence of hydrogen peroxide has the drawback of causing appreciable degradation of the fibres, as well as considerable bleaching of the keratin fibres, which is not always desirable.
The oxidation dyeing of keratin fibres can also be carried out using oxidizing systems other than hydrogen peroxide, such as enzymatic systems. Thus, it has already been proposed to dye keratin fibres, in particular in patent application EP-A-0,310,675, with compositions comprising an oxidation dye precursor of benzenic type in combination with enzymes such as pyranose oxidase, glucose oxidase or uricase, in the presence of a donor for the said enzymes. Although being used under conditions which do not result in degradation of the keratin fibres which is comparable to that caused by the dyes used in the presence of hydrogen peroxide, these dyeing processes are not entirely satisfactory, in particular as regards the strength of the colorations obtained.
Now, the Applicant has just discovered that it is possible to obtain novel dyes, capable of leading to colorations that are stronger than those of the prior art using an enzymatic system, by combining at least one oxidation base, at least one enzyme of sarcosine oxidase type, and at least one donor for the said enzyme.
This discovery forms the basis of the present invention.
A first subject of the invention is thus a ready-to-use composition for the oxidation dyeing of keratin fibres, and in particular of human keratin fibres such as the hair, characterized in that it comprises, in a medium which is suitable for dyeing:
The dye composition in accordance with the invention makes it possible to obtain colorations that are stronger than those obtained with the compositions of the prior art using an enzymatic oxidizing system, such as, for example, the uric acid/uricase oxidizing system.
Furthermore, the colorations obtained with the dye composition in accordance with the invention are relatively unselective and show good resistance to the
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"L'Oreal"
Liott Caroline D.
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