Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Reexamination Certificate
2000-02-15
2002-07-16
Gupta, Yogendra N. (Department: 1751)
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
C008S406000, C008S407000, C008S410000, C008S411000, C008S412000, C008S563000
Reexamination Certificate
active
06419710
ABSTRACT:
The invention relates to a composition for the oxidation dyeing of keratin fibers, and, in particular, human keratin fibers, such as the hair, comprising, in a medium suitable for dyeing, at least one oxidation base, at least one coupler chosen from substituted meta-diphenols, and at least one enzyme of 2-electron oxidoreductase type in the presence of at least one donor for the enzyme, the composition being free from any additional coupler chosen from substituted meta-phenylenediamines. The invention also relates to the dyeing process using this composition.
It is known to dye keratin fibers, especially human hair, with dye compositions containing oxidation dye precursors, in particular, ortho- or para-phenylenediamines, ortho- or para-aminophenols and heterocyclic bases, generally referred to as oxidation bases. Oxidation dye precursors, or oxidation bases, are colorless or weakly colored compounds which, when combined with oxidizing products, can give rise to colored 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 color modifiers, the latter being chosen, in particular, from aromatic meta-diamines, meta-aminophenols, meta-diphenols and certain heterocyclic compounds. The variety of molecules used as oxidation bases and couplers allows a wide range of colors 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, and 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 color differences along the same length of keratin fiber, which may in fact be differently sensitized (i.e., damaged) between its tip and its root.
The oxidation dyeing of keratin fibers 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 fibers, as well as considerable bleaching of the keratin fibers, which is not always desirable.
The oxidation dyeing of keratin fibers 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 fibers, in particular, in European patent application EP-A-0,310,675, incorporated herein by reference, with compositions comprising an oxidation base and optionally a coupler, in combination with enzymes such as pyranose oxidase, glucose oxidase or uricase, in the presence of a donor for the enzymes. Although they are used under conditions that do not result in a degradation of the keratin fibers, comparable to that caused by the dyes used in the presence of hydrogen peroxide, these dyeing processes nevertheless lead to colorations that are not entirely satisfactory, in particular, regarding their intensity, strength, and resistance to the various attacking factors to which hair may be subjected.
The inventors have now discovered that it is possible to obtain new dyes, which are capable of leading to intense colorations, without giving rise to any significant degradation of the keratin fibers, and which are relatively unselective and show good resistance to the various attacking factors to which hair may be subjected. These dyes may be obtained by combining at least one oxidation base, at least one coupler chosen from substituted meta-diphenols, and at least one enzyme of 2-electron oxidoreductase type in the presence of at least one donor for the enzyme, the composition being free from any additional coupler chosen from substituted meta-phenylenediamines. 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 fibers, and, in particular, human keratin fibers such as the hair, characterized in that it comprises, in a medium which is suitable for dyeing:
at least one oxidation base,
at least one coupler chosen from substituted meta-diphenols,
at least one enzyme of 2-electron oxidoreductase type, and
at least one donor for the enzyme;
the composition being free from any additional coupler chosen from substituted meta-phenylenediamines and from any polymer chosen from anionic amphiphilic polymers comprising at least one hydrophilic unit and at least one allyl ether unit having a fatty chain. The ready-to-use dye composition according to the invention leads to intense, relatively unselective colorations with excellent properties of resistance both to atmospheric agents, such as light and bad weather, and to perspiration and the various treatments to which hair may be subjected, e.g., washing and permanent-waving. These properties are particularly noteworthy in regard to the intensity of the colorations obtained. A subject of the invention is also a process for the oxidation dyeing of keratin fibers using this ready-to-use dye composition.
The 2-electron oxidoreductase(s) used in the ready-to-use dye composition according to the invention can be chosen, in particular, from pyranose oxidases, glucose oxidases, glycerol oxidases, lactate oxidases, pyruvate oxidases and uricases. According to the invention, the 2-electron oxidoreductase is preferably chosen from uricases of animal, microbiological or biotechnological origin. Examples include uricase extracted from boar liver, uricase from
Arthrobacter globiformis
, as well as uricase from
Aspergillus flavus
. The 2-electron oxidoreductase(s) can be used in pure crystalline form or in a form diluted in a diluent, which is inert with respect to the 2-electron oxidoreductase. The 2-electron oxidoreductase(s) according to the invention preferably represent(s) from 0.01 to 20% by weight approximately relative to the total weight of the ready-to-use dye composition, and even more preferably from 0.1 to 5% by weight approximately relative to this weight.
According to the invention, the term “donor” is understood to refer to the various substrates involved in the functioning of the 2-electron oxidoreductase(s). The nature of the donor (or substrate) for the enzyme varies depending on the nature of the 2-electron oxidoreductase used. For example, as donors for the pyranose oxidases, mention may be made of D-glucose, L-sorbose and D-xylose; as a donor for the glucose oxidases, mention may be made of D-glucose; as donors for the glycerol oxidases, mention may be made of glycerol and dihydroxyacetone; as donors for the lactate oxidases, mention may be made of lactic acid and its salts; as donors for the pyruvate oxidases, mention may be made of pyruvic acid and its salts; and lastly, as donors for the uricases, mention may be made of uric acid and its salts. The donor(s) (or substrate(s)) used according to the invention preferably represent(s) from 0.01 to 20% by weight approximately relative to the total weight of the ready-to-use dye composition in accordance with the invention, and even more preferably from 0.1 to 5% by approximately relative to this weight.
The nature of the oxidation base(s) used in the ready-to-use dye composition is not a critical factor. They can be chosen, in particular, from para-phenylenediamines, double bases, para-aminophenols, orthoaminophenols and heterocyclic oxidation bases.
Among the para-phenylenediamines that can be used as oxidation bases in the dye compositions in accordance with the invention, particular examples include the compounds of formula (I) below, and the acid addition salts thereof:
in which:
R
1
represents a hydrogen atom, a C
1
-C
4
alkyl radical, a C
1
-C
4
monohydroxyalkyl radical, a C
2
-C
4
polyhydroxyalkyl radical, a (C
1
-C
4
)alkoxy(C
1
-C
4
)alkyl radical, a C
1
-C
4
alkyl radical substituted with a
Demeulenaere Christelle
Maubru Mireille
Elhilo Eisa
Finnegan, Henderson Farabow, Garrett and Dunner L.L.P.
Gupta Yogendra N.
L'Oreal (S.A.)
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