Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Reexamination Certificate
1998-12-15
2001-02-20
Liott, Caroline D. (Department: 1751)
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
C008S408000, C008S426000, C008S524000
Reexamination Certificate
active
06190421
ABSTRACT:
The invention relates to a process for dyeing keratin fibres, in particular human keratin fibres and especially the hair, characterized in that an extemporaneous mixture is applied to the keratin fibres at the time of use, this mixture comprising: a composition (A) containing at least one oxidation dye precursor and optionally at least one coupler, a powdered composition (B) containing at least one direct dye, and a composition (C) containing at least one oxidizing agent.
The use of oxidation dye precursors is widespread in the field of hair dyeing. This class of dyes comprises compounds that are initially colourless or only faintly coloured, commonly referred to as “oxidation bases”, which develop their dyeing power on the hair in the presence of oxidizing agents, leading to the formation of coloured compounds. The formation of these coloured compounds results either from an oxidative condensation of the oxidation bases with themselves, or from an oxidative condensation of the oxidation bases with coloration modifiers, commonly referred to as “couplers”, which are generally present in the dye compositions used in oxidation dyeing.
The variety of molecules used, which consist, on the one hand, of the oxidation bases, and, on the other hand, of the couplers, produces a very wide range of colours.
In order further to vary the shades obtained and to give them glints, it is also well known to use, in combination with oxidation dye precursors and couplers, direct dyes, i.e. coloured substances which provide a coloration in the absence of oxidizing agent.
However, the conventional use, i.e. in the same dye composition, of oxidation dye precursors and direct dyes, such as, in particular, most nitrobenzenes, is limited by the fact that these direct dyes are particularly reactive towards the reducing agents which generally need to be added to compositions containing oxidation dye precursors in order to prevent premature oxidation of the said precursors before the moment chosen for the development of the coloration on the hair, for example during storage.
This reactivity towards the reducing agents is reflected by a gradual loss or a change in the dyeing power of the direct dyes during storage of the dye compositions before they are used.
In addition, the conventional use of direct dyes is limited in terms of concentration in the composition for reasons of solubility of the said dyes in the dye support. The result of this is that the dyeing power of the compositions obtained is often limited.
To overcome these drawbacks, the Applicant has conducted considerable research in this matter, and has now discovered, surprisingly, that it is possible to use direct dyes at higher concentrations than those in the prior art, and to obtain strong dyes, which also show good resistance towards atmospheric agents such as light and bad weather, and towards perspiration and the various treatments to which the hair may be subjected (washing, permanent-waving), using, at the time of use, an extemporaneous mixture of three separately prepackaged components (A), (B) and (C), in which (A) contains the oxidation dye precursor and optionally the coupler, (B) contains the direct dye, in powder form or dispersed in an organic excipient and/or an inorganic pulverulent excipient in powder form, and (C) contains the oxidizing agent.
This invention also allows better conservation of the dyeing power of the compositions.
This discovery forms the basis of the present invention.
The subject of the present invention is thus a process for dyeing keratin fibres, in particular human keratin fibres and especially the hair, characterized in that an extemporaneous mixture is applied to the keratin fibres at the time of use, this mixture comprising three compositions (A), (B) and (C) below:
a composition (A) containing at least one oxidation dye precursor and optionally at least one coupler, in a medium which is suitable for dyeing,
a composition (B) in powder form, containing at least one direct dye, optionally dispersed in an organic pulverulent excipient and/or an inorganic pulverulent excipient, and
a composition (C) containing at least one oxidizing agent in a medium which is suitable for dyeing.
The subject of the invention is also a ready-to-use composition containing three components (A), (B) and (C) which are stored separately and mixed at the time of use, for application to keratin fibres.
Another subject of the invention relates to multicompartment devices or “kits” for dyeing keratin fibres, characterized in that they contain at least three compartments, one of which contains a composition (A) containing at least one oxidation dye precursor and optionally at least one coupler, in a medium which is suitable for dyeing, a second contains a composition (B), in powder form, containing at least one direct dye, in powder form or dispersed in an organic pulverulent excipient and/or an inorganic pulverulent excipient, and a third contains a composition (C) containing at least one oxidizing agent in a medium which is suitable for dyeing.
However, other characteristics, aspects, objects and advantages of the invention will become even more apparent on reading the description and the examples which follow.
The oxidation dye precursors which can be used in the dyeing process according to the invention are those used conventionally in oxidation dye compositions, i.e. ortho- or para-phenylenediamines, bis(phenyl)alkylenediamines, ortho- or para-aminophenols, or heterocyclic bases, as well as the addition salts of these compounds with an acid.
Among the para-phenylenediamines which can be used as oxidation bases in the dyeing process according to the invention, mention may be made in particular of the compounds corresponding to formula (I) below, and the addition salts thereof with an acid:
in which: R
1
, represents a hydrogen atom or a C
1
-C
4
alkyl, C
1
-C
4
monohydroxyalkyl, C
2
-C
4
polyhydroxyalkyl or (C
1
-C
4
)alkoxy(C
1
-C
4
)alkyl radical, R
2
represents a hydrogen atom or a C
1
-C
4
alkyl, C
1
-C
4
monohydroxyalkyl or C
2
-C
4
polyhydroxyalkyl radical, R
3
represents a hydrogen atom, a halogen atom such as a chlorine atom, or a C
1
-C
4
alkyl, sulpho, carboxyl, C
1
-C
4
monohydroxyalkyl or C
1
-C
4
hydroxyalkoxy radical, R
4
represents a hydrogen atom or a C
1
-C
4
alkyl radical.
In formula (I) above, and when R
3
is other than a hydrogen atom, then R
1
and R
2
preferably represent a hydrogen atom and R
3
is preferably identical to R
4
, and when R
3
represents a halogen atom, then R
1
, R
2
and R
4
preferably represent a hydrogen atom.
Among the para-phenylenediamines of formula (I) above, mention may be made more particularly of para-phenylenediamine, para-toluylenediamine, 2-isopropyl-para-phenylenediamine, 2-(&bgr;-hydroxyethyl)-para-phenylenediamine, 2-(&egr;-hydroxyethyloxy)-para-phenylenediamine, 2,6-dimethyl-para-phenylenediamine, 2,6-diethyl-para-phenylenediamine, 2,3-dimethyl-para-phenylenediamine, N,N-bis(&egr;-hydroxy-ethyl)-para-phenylenediamine, 4-amino-1-(&bgr;-methoxyethyl)aminobenzene and 2-chloro-para-phenylenediamine, and the addition salts thereof with an acid.
Among the bis(phenyl)alkylenediamines which can be used as oxidation bases in the dyeing process according to the invention, mention may be made in particular of the compounds corresponding to the formula (II) below, and the addition salts thereof with an acid:
in which:
Q
1
and Q
2
, which may be identical or different, represent a hydroxyl radical or a radical NHR
8
in which R
8
represents a hydrogen atom or a C
1
-C
4
alkyl radical, R
5
represents a hydrogen atom, a C
1
-C
4
alkyl, C
1
-C
4
monohydroxyalkyl or C
2
-C
4
polyhydroxyalkyl radical or a C
1
-C
4
aminoalkyl radical in which the amino residue may be substituted,
R
6
and R
7
, which may be identical or different, represent a hydrogen or halogen atom or a C
1
-C
4
alkyl radical,
W represents a radical taken from the group consisting of the following radicals:
—(CH
2
)
n
; —(CH
2
)m—O—(CH
2
)
m
; —(CH
2
)
m
—CHOH—(CH
2
)
m
and
in which n is an in
Rondeau Christine
Zemori Nicole
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal
Liott Caroline D.
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