Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Reexamination Certificate
1998-05-20
2001-02-13
Liott, Caroline D. (Department: 1751)
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
C008S414000, C008S415000, C008S428000, C008S558000, C008S679000
Reexamination Certificate
active
06187057
ABSTRACT:
The invention relates to a composition for dyeing the hair, comprising at least one direct dye and at least one crosslinked polymer containing acrylic and/or acrylate units and acrylamide units.
It is known to dye hair fibres with direct dye compositions according to a so-called “direct dyeing” process which consists in applying to the fibres dye molecules which have an affinity for the said fibres, in leaving them to stand on the fibres and then in rinsing the fibres. The resulting colorations are temporary or semi-permanent colorations depending on the nature of the interactions between the direct dyes and the hair fibre, and their desorption from the surface and/or from the core of the fibre.
In order to facilitate the application of such dye compositions to the hair, in particular to prevent them from running down the forehead and the face or beyond the point of application initially chosen, when they are applied or during the exposure time required for dyeing, the viscosity of the compositions is conventionally increased using crosslinked polyacrylic acid (thickener). However, dye compositions based on direct dyes and on crosslinked polyacrylic acid no longer prove to be sufficiently satisfactory as regards their dyeing properties after they have been stored for a certain period at a temperature below room temperature, for example below 10° C., and in particular at about 4° C. Thus, it is observed that compositions stored under such conditions give rise to a weaker rise of the direct dye on the hair and thus have an insufficient dyeing power.
The present invention aims to solve the above problem, i.e. to propose a means which makes it possible to preserve the dyeing power of dye compositions containing a direct dye, for compositions liable to be stored at low temperatures, in particular at temperatures below 10° C.
After considerable research conducted in this matter, the Applicant has now discovered that it is possible to preserve the dyeing power of direct dye compositions if an effective amount of a crosslinked polymer containing acrylic and/or acrylate units and acrylamide units is added to these compositions.
Even after relatively prolonged storage at temperatures below 10° C., and in particular close to 4° C., compositions with good dyeing power and whose rise on the hair is very satisfactory are obtained.
This discovery forms the basis of the present invention.
The subject of the present invention is thus a cosmetic composition for dyeing the hair, of the type comprising, in a cosmetically acceptable support which is suitable for dyeing, at least one direct dye, and which is characterized in that it also comprises at least one crosslinked polymer containing acrylic and/or acrylate units and acrylamide units.
The subject of the present invention is also the use of a crosslinked polymer containing acrylic and/or acrylate units and acrylamide units, in, or for the manufacture of, a direct dye composition for the hair, comprising at least one direct dye, in order to improve the conservation of the dyeing power of the said composition, in particular after storage below about 10° C., and especially at about 4° C.
The invention also relates to a process for improving the conservation of the dyeing power, in particular after storage below about 10° C., and especially at about 4° C., of a dye composition for the hair comprising at least one direct dye, this process consisting in introducing an effective amount of at least one crosslinked polymer containing acrylic and/or acrylate units and acrylamide units into the said composition.
Lastly, the invention relates to a process for dyeing the hair using the compositions with improved properties in accordance with the invention.
However, other characteristics, aspects, objects and advantages of the invention will become even more apparent on reading the description and the examples which follow.
According to the invention, the expression acrylic and/or acrylate units is understood to denote units of structure:
in which,
R
1
denotes H or CH
3
, preferably H,
M denotes hydrogen, an ammonium, an alkali metal such as sodium or potassium or a primary or secondary monoamine, and preferably an ammonium.
The term acrylamide units is also understood to denote units of structure:
in which,
R
1
denotes H or CH
3
, preferably H,
R
2
denotes an amino, dimethylamino, tert-butylamino or —NH—CH
2
OH radical, and preferably an amino radical.
Preferably, the polymers used in the context of the present invention are polymers of the type containing acrylate units (M other than H) and containing acrylamide units, crosslinked using a suitable crosslinking agent.
The crosslinked polymer(s) containing acrylic and/or acrylate units and acrylamide units, which can be used in the context of the present invention, are thus, more particularly, ammonium acrylate/acrylamide or sodium acrylate/acrylamide copolymers crosslinked by a compound containing olefinic polyunsaturation, preferably chosen from divinylbenzene, tetraallyloxyethane, methylenebisacrylamide, diallyl ether, polyallylpolyglyceryl ethers or allylic ethers of alcohols from the sugar series, such as erythritol, pentaerythritol, arabitol, mannitol, sorbitol or glucose.
Crosslinked copolymers of this type are described and prepared in French patent FR-2,416,723 and U.S. Pat. Nos. 2,798,053 and 2,923,692.
According to the invention, it is most particularly preferred to use crosslinked copolymers of the ammonium acrylate/acrylamide type, and even more preferably a 95/5 by weight copolymer of this type, in the form of a water-in-oil emulsion consisting of about 32% by weight of the said copolymer, about 20% by weight of C
11
-C
13
isoparaffin, 2% by weight of sorbitan sesquioleate, 3% by weight of a hydrophilic ethoxylated derivative and 43% by weight of water. Such an emulsion is marketed by the company Hoechst under the name Bozepole C Nouveau.
The crosslinked polymer containing acrylic and/or acrylate units and acrylamide units is generally used in the dye composition according to the invention in active material proportions which can be from about 0.05 to about 5% by weight and preferably from 0.1 to about 3% by weight, relative to the total weight of the composition.
The direct dyes which can be used in the dye composition according to the present invention are direct dyes in the sense defined above, that is to say dyes which can be used in a standard direct dyeing process.
Among those used conventionally, mention may be made of nitrobenzene dyes such as nitrophenylenediamines, nitrodiphenylamines, nitroanilines, nitrophenols or nitrophenol ethers, nitropyridines, anthraquinone, mono- or diazo, triarylmethane, azine, acridine and xanthene dyes or alternatively metalliferous dyes.
The direct dyes more particularly preferred according to the invention are chosen from the following:
i) the nitrobenzene dyes of formula (I) below:
in which:
R
3
denotes an NH
2
radical, an amino radical monosubstituted with an alkyl, monohydroxyalkyl, polyhydroxyalkyl or aminoalkyl radical, or an amino radical disubstituted with identical or different alkyl, mono- or polyhydroxyalkyl or aminoalkyl radicals,
R
4
denotes hydrogen, hydroxyl, alkoxy, mono- or polyhydroxyalkyloxy, or the same meanings denoted above for R
3
, except for the disubstituted amino radical,
R
5
denotes hydrogen, alkyl, nitro or halogen,
ii) the anthraquinone dyes of the formula (II) below:
in which
R
6
denotes hydrogen or a monohydroxyalkyl or polyhydroxyalkyl radical,
R
7
denotes hydrogen or an alkyl or alkoxy radical,
R
8
denotes hydrogen or a hydroxyl, amino, monohydroxyalkylamino or polyhydroxyalkylamino radical
R
9
and R
10
, which may be identical or different, are hydrogen, hydroxyl or amino,
iii) the azo dyes of formula (III) below:
in which:
R
11
denotes a nitro or amino radical or an amino radical mono- or disubstituted with alkyls,
R
12
denotes hydrogen or an alkyl radical,
R
13
denotes an amino radical or an amino radical mono- or disubstituted with monohydroxyalkyls,
it being understood that the alkyl and alkoxy
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal
Liott Caroline D.
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