WO2008043938A2 - Composition comprising at least one compound that generates active oxygen, and at least one thickener, method for its preparation and its use in cosmetics and in dental hygiene - Google Patents

Abstract

Composition comprising at least one compound that generates active oxygen and at least one thickener selected from the inverse microlatices of branched or crosslinked polyelectrolytes, containing at least one AMPS monomer, the method for its preparation, and its use in cosmetics, as a hair bleaching agent for the human body, as a whitening gel for the teeth or as a second component of a hair colouring composition presented in the form of two separate components.

Description

 Composition comprising at least one active oxygen generating compound, and at least one thickening agent, process for its preparation and its use in cosmetics and dental hygiene

The present application relates to novel cosmetic compositions comprising at least one active oxygen generating agent and at least one thickening agent.

Thickening polymers are widely used in the cosmetics industry. These are key products in the preparation of formulations such as creams, creams and lotions and / or milks. These polymers are at the origin of the rheological behavior of these formulations, which itself greatly influences both the sensations felt by the subject to their touch or their spread on the skin (sticky effect) and their storage stability. long-term (more than one year). Such polymers must themselves be stable in the presence of active ingredients of all kinds, their thickening power must be maintained even at acidic pH which are still acceptable for the skin, at high concentrations of salts in solution.

Thickeners of oxidizing aqueous compositions, at acidic pH, are in great demand, in particular for the formulation of bleaching products or hair dyes. Indeed, the gelation of the oxidizing solution allows both to optimize the mixture, at the time of use, with the reducing solution and also to facilitate the holding of the bleaching preparation or dyeing on the hair avoiding run-offs on the face. The polymers are frequently used to thicken these oxidizing compositions but they have the drawback of having an unstable viscous effect over time within these preparations, in particular when they are subjected to temperature variations during storage. To limit the drop in viscosity over time, stabilizing additives such as sequestering agents are added in these oxidizing preparations and many studies have been carried out to optimize the choice of the polymer or to make polymer blends which, acting in synergy, make it possible to to prevent this fall.

Work of this type is described for example in the French patent application published under the number FR 2 818 537 relating to the use of amphiphilic polymers comprising at least one ethylenic monomer containing sulfonic group and more particularly the polymers or copolymers of acid 2-acrylamido 2-methyl-1- propanesulfonic acid [also known as 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid or AMPS]; in the French patent application published under the number FR 2 848 109 which discloses the use of a mixture of polymers including at least one copolymer based on acrylic acid or alkyl acrylate and 2-acrylamido acid -2-methyl-1-propanesulfonic acid; in the French patent application published under the number FR 2 753 372, which discloses an oxidizing composition comprising hydrogen peroxide and a homopolymer of 2-acrylamido-2-methyl-1-propanesulfonic acid neutralized with ammonia; in the US patent application published under number US 2004/0143912 which discloses a capillary oxidizing composition comprising hydrogen peroxide and a mixture of at least one copolymer based on acrylamide and 2-acrylamido-2-methyl-1-acid. propanesulfonic acid and at least one polymer chosen from homopolymers of 2-acrylamido-2-methyl-1-propanesulfonic acid and amphiphilic copolymers based on 2-acrylamido-2-methyl-1-propanesulfonic acid and comprising a hydrophobic portion; in the French patent application published under the number 2,816,316 which discloses an oxidizing gel comprising hydrogen peroxide and a homopolymer of 2-acrylamido-2-methyl-1-propanesulfonic acid; in the US patent application published under number US 2004/0235700 which discloses an oxidizing composition comprising hydrogen peroxide and a mixture of at least 2-acrylamido-2-methyl-propanesulfonic acid and methacrylate-based copolymer polyoxyethylene fatty alcohols; in the US patent application published under the number US 2006/0191081 which discloses a powdery oxidizing composition comprising at least one peroxygenated salt, at least one amphiphilic polymer and at least one polydecene; in the French patent application published under number 2,848,107 which discloses an oxidizing gel comprising hydrogen peroxide, a 2-acrylamido-2-methyl-propanesulfonic acid homopolymer and a polyoxypropylene and polyoxyethylene block polymer; and in the US patent application published under the number US 2004/0226110 which discloses a ready-to-use oxidizing composition for lightening the hair comprising at least one anhydrous composition in the form of a paste comprising at least one peroxygenated salt, at least one alkaline agent and at least one oil-in-water emulsion comprising at least one polymer of methacrylic acid with at least one fatty alcohol methacrylate.

As part of its research to develop new emulsifying and thickening compounds, the Applicant has been interested in novel polymers of 2-acrylamido-2-methyl-1-propanesulfonic acid which are stable in an oxidizing medium.

The subject of the invention is therefore a composition comprising at least one active oxygen generating compound chosen from hydrogen peroxide, alkali metal or alkaline earth metal perborates, alkali or alkaline earth metal percarbonates, persulfates of alkali or alkaline-earth metals, alkali or alkaline-earth metal bromates, alkali or alkaline earth metal periodates, alkali or alkaline-earth metal peroxides, alkali or alkaline earth metal persilicates, ferrocyanates of alkali or alkaline earth metals, urea peroxide, melamine peroxide or a mixture of the above compounds, and at least one thickening agent, characterized in that the thickening agent is chosen from among reverse micro-latexes comprising a oil phase, an aqueous phase, at least one emulsifying system capable of ensuring the formation of inverse microlatex, from 15% to 40% by mass, and preferably from 20% to 30% by mass; and a branched or crosslinked polyelectrolyte selected from homopolymers of partially or fully salified 2-acrylamido-2-methyl-1-propanesulphonic acid or terpolymer or tetrapolymer copolymers of 2-acrylamido-2-methyl-1-ene propanesulfonic acid partially or totally salified with one or more neutral monomers chosen from acrylamide, N-methyl acrylamide, N, N-dimethylacrylamide, methacrylamide, diacetoneacrylamide, N-isopropylacrylamide, N- [2 1,1-bis (hydroxymethyl) ethyl] propenamide [or tris (hydroxymethyl) acrylamidomethane or N-tris (hydroxymethyl) methyl acrylamide also referred to as THAM], (2-hydroxyethyl) acrylate, 2,3-dihydroxypropyl), (2-hydroxyethyl) methacrylate, (2,3-dihydroxypropyl) methacrylate, an ethoxylated derivative of molecular weight between 400 and 1000, of each of these esters or vinyl pyrrolidone and possibly with a or a plurality of monomers selected from monomers having a weak acid function partially or fully salified.

According to a particular embodiment of the present invention, the active oxygen generating compound is hydrogen peroxide.

By partially or totally salified, is meant mainly in the composition object of the present invention, partially or completely salified in the form of an alkali metal salt such as for example the sodium salt or the potassium salt, salt of ammonium, a salt of an amino alcohol such as for example the salt of monethanolamine or an amino acid salt such as for example the salt of lysine. The oil phase of the inverse microlatex used in the composition which is the subject of the present invention comprises a commercial mineral oil containing saturated hydrocarbons such as paraffins, isoparaffins and cycloparaffins, having a density between 0.7 and 0 at room temperature. , 9 and a boiling point greater than about 250 ^° C., such as, for example, MARCOL ™ 52, ISOPAR ™ M or ISOPAR ™ L marketed by EXXON CHEMICAL; isohexadecane, identified in Chemical Abstracts by the number RN = 93685-80-4 and which is a mixture of isoparaffins Ci ₂ , Ci ₆ and C ₂ o containing at least 97% of isoparaffins Ci ₆ , among which the main constituent is 2,2,4,4,6,8,8-heptamethylnonane (RN = 4390-04-9); it is marketed in France by Bayer or isododecane also marketed in France by Bayer; or a synthetic oil such as hydrogenated polydecene or hydrogenated polyisobutene, marketed in France by Ets B. Rossow and Co. under the name PARLEAM-POLYSYNLANE ™. He is quoted in: Michel and Irene Ash; Thesaurus of Chemical Products, Chemical Publishing Co., Inc. 1986 Volume I, page 211 (ISBN 0 7131 3603 0); or a vegetable oil such as squalane of vegetable origin marketed in France by the company SOPHIM, under the name PHYTOSQUALAN ™ and identified in Chemical Abstracts by the number RN = 111-01-3; it is a mixture of hydrocarbons containing more than 80% by weight of 2,6,10,15,19,23-hexamethyltetracosane, or a mixture of several of these oils. The oil phase may also include fatty acid esters such as octyl palmitate or isostearyl isostearate; triglycerides of fatty acids or mixtures of fatty acids such as the mixture of triglycerides of fatty acids containing from 6 to 10 carbon atoms, marketed under the name SOFTENOL ™ 3819, the mixture of triglycerides of fatty acids containing 8 to 10 carbon atoms, marketed under the name SOFTENOL ™ 3108, the mixture of triglycerides of fatty acids containing from 8 to 18 carbon atoms, sold under the name SOFTENOL ™ 3178, the mixture of triglycerides of fatty acids containing 12 to 18 carbon atoms, marketed under the name SOFTENOL ™ 3100, the mixture of triglycerides of fatty acids containing 7 carbon atoms sold under the name SOFTENOL ™ 3107, the mixture of triglycerides of fatty acids containing 14 carbon atoms marketed under the name SOFTENOL ™ 3114 or the mixture of triglycerides of fatty acids containing 18 carbon atoms sold under the name SOFTENOL ™ 3118, glycerol dilaurate, sodium dioleate glycerol, glycerol isostearate, glycerol distearate, glycerol monolaurate, glycerol monooleate, glycerol monoisostearate, glycerol monostearate or a mixture of these compounds.

The oil phase of the inverse microlatex used in the composition which is the subject of the present invention represents from 25% to 50%, and preferably from 30% to 40%, of the total mass of the composition.

The aqueous phase of the inverse micro-latex used in the composition that is the subject of the present invention represents from 15% to 50% of the total mass of the composition.

According to the definition of the composition which is the subject of the present invention, an emulsifying system capable of ensuring the formation of inverse microlatexs comprises a surfactant system comprising at least one surfactant of water-in-oil (W / O) type and at least one surfactant of type oil in water (O / W), said system having a total HLB number greater than or equal to 8.5 and less than or equal to 11 and preferably greater than or equal to 9.5 and less than or equal to 10. In the sense of According to the present invention, the HLB number is calculated by the formula HLB = 20. (1-Is / I _a ), in which I _s is the saponification number of the emulsifying system and I _is the starting fatty acid number. or the starting fatty acid mixture as described by N. Schonfeld in the booklet "Active surface ethylene oxide adducts", page 228.

By water-in-oil (W / O) surfactant, is meant in the above definition, either a single surfactant or a mixture of surfactants provided that said mixture has a sufficiently low HLB value to induce water-in-oil emulsions. As an emulsifier of the water-in-oil type, there are, for example, sorbitan esters, such as sorbitan oleate, such as that marketed by the company SEPPIC under the name MONTANE ™ 80, sorbitan isostearate, such as that marketed by the company SEPPIC under the name MONTANE ™ 70 or sorbitan sesquioleate such as that marketed by the company SEPPIC under the name Montane ™ 83. There are also certain polyethoxylated sorbitan esters, for example pentaethoxylated sorbitan mono-oleate such as that marketed by the company SEPPIC under the name MONTANOX ™ 81 or pentaethoxylated sorbitan isostearate such as that sold under the name MONTANOX ™ 71 by the company SEPPIC. Diethoxylated oleocetyl alcohol such as that marketed under the name SIMULSOL ™ OC 72 by the company SEPPIC, tetraethoxylated lauryl acrylate such as that sold under the name BLEMMER ™ ALE 200 or polyesters with a molecular weight between 1000 and 3000 products from the condensation between a poly (isobutenyl) succinic acid or its anhydride and a polyethylene glycol, such as HYPERMER ™ 2296 sold by UNIQEMA or finally block copolymers with a molecular weight of between 2500 and 3500, such as HYPERMER ™ B246 marketed by the company UNIQEMA or SIMALINE ™ IE 200 marketed by the company SEPPIC.

By water-in-oil (W / O) type surfactant, is meant in the above definition, a single surfactant is a mixture of surfactants provided that said mixture has a sufficiently high HLB value to induce oil-in-water emulsions. Examples of emulsifiers of the oil-in-water type are ethoxylated sorbitan esters, such as polyethoxylated sorbitan oleate with 20 moles of ethylene oxide, sold by the company SEPPIC under the name MONTANOX ™ 80. polyethoxylated sorbitan laurate with 20 moles of ethylene oxide, marketed by the company SEPPIC under the name MONTANOX ™ 20, castor oil polyethoxylated with 40 moles of ethylene oxide sold under the name SIMULSOL ™ OL50, the decaethoxylated oleodecyl alcohol sold by the company SEPPIC under the name SIMULSOL ™ OC 710, the lauryl heptaethoxylated alcohol sold under the name SIMULSOL ™ P7 or the polyethoxylated sorbitan monostearate with 20 moles of ethylene oxide marketed by the company SEPPIC under the name MONTANOX ™ 60.

The inverse micro-latex used in the composition that is the subject of the present invention generally contains from 8% to 20% by weight of the said emulsifying system.

Said reverse microlatex may further comprise one or more additives chosen in particular from complexing agents, transfer agents or chain-limiting agents.

Connected polyelectrolyte refers to a nonlinear polyelectrolyte which has pendant chains so as to obtain, when this polymer is dissolved in water, a high state of entanglement leading to very large low gradient viscosities.

The term "crosslinked polyelectrolyte" denotes a nonlinear polymer in the form of a three-dimensional network which is insoluble in water but swellable with water and thus leads to the production of a chemical gel.

When this polyelectrolyte is crosslinked, it is more particularly with a diethylenic or polyethylenic compound in the molar proportion expressed with respect to monomers used, from 0.005% to 1%, and preferably from 0.01% to 0.2% and more particularly from 0.01% to 0.1%. Preferably, the crosslinking agent and / or the branching agent is chosen from ethylene glycol dimethacrylate, diethylene glycol diacrylate, sodium diallyloxyacetate, ethylene glycol diacrylate, diallyl urea, triallylamine and trimethylol propanetriacrylate. or methylenebis (acrylamide).

In the polyelectrolyte constituting the inverse microlatex used in the composition object of the present invention, the 2-methyl 2 - [(1-oxo-2-propenyl) amino] 1-propanesulfonic acid is preferably partially or totally salified in the form of sodium salt, potassium salt or ammonium salt. In the polyelectrolyte constituting the inverse microlatex used in the composition which is the subject of the present invention, the weak acid function of the monomers containing it is in particular the partially salified carboxylic acid function. Said monomers are for example acrylic acid, methacrylic acid, itaconic acid, maleic acid or 3-methyl-3 - [(1-oxo-2-propenyl) amino] butanoic acid partially or totally salified. They are preferably partially or totally salified in the form of an alkali metal salt, such as for example the sodium salt or the potassium salt, ammonium salt, a salt of an amino alcohol such as by for example, the salt of monethanolamine or an amino acid salt such as, for example, the lysine salt.

According to one particular aspect of the present invention, the polyelectrolyte constituting the inverse microlatex used in the composition which is the subject of the present invention comprises between 95% and 25% molar of 2-methyl 2 - [(1-oxo-2) acid monomer. (propenyl) amino] 1-propanesulfonic acid partially or totally salified and between 5% and 75 mol% of one or more neutral monomers.

According to another particular aspect of the present invention, the polyelectrolyte constituting the thickening agent comprises between 90% and 40% molar of 2-methyl-2 - [(1-oxo-2-propenyl) amino] 1-propanesulfonic acid monomer partially. or totally salified and between 10% and 60 mol% of one or more neutral monomers.

According to another particular aspect of the present invention, the polyelectrolyte constituting the thickening agent further comprises up to 30 mol% of one or more monomers having a weak acid function.

According to another particular aspect, the constituent polyelectrolyte of the inverse microlatex used in the composition which is the subject of the present invention is chosen from: crosslinked copolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of ammonium salt, potassium salt or sodium salt, and N, N-dimethylacrylamide;

crosslinked copolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of ammonium salt, potassium salt or sodium salt and acrylamide;

crosslinked copolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially salified in the form of sodium salt, potassium salt or ammonium salt and N- [2-hydroxy-1,1-bis (hydroxymethyl) ethyl] propenamide; cross-linked copolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of ammonium salt, potassium salt or sodium salt and N-vinyl pyrrolidone;

cross-linked copolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of ammonium salt, potassium salt or sodium salt and 2-hydroxyethyl acrylate;

crosslinked terpolymers of acrylamide, 2-methyl-2 - [(1-oxo-2-propenyl) amino] 1-propanesulfonic acid and partially salified acrylic acid in the sodium salt form,

cross-linked terpolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of ammonium salt, potassium salt or sodium salt, partially salified acrylic acid in the form of sodium salt, potassium salt or ammonium salt and N, N-dimethyl acrylamide;

cross-linked tetrapolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of ammonium salt, potassium salt or sodium salt, partially salified acrylic acid in the form of sodium salt, potassium salt or ammonium salt, N, N-dimethyl acrylamide and acrylamide;

crosslinked terpolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of sodium salt, potassium salt or ammonium salt, N, N-dimethyl acrylamide and acrylamide; cross-linked terpolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially salified in the form of sodium salt, potassium salt or ammonium salt, N, N-dimethylacrylamide and N-isopropylacrylamide;

crosslinked terpolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of sodium salt, potassium salt or ammonium salt, N, N-dimethylacrylamide and N- [2-hydroxy-1,1-bis (hydroxymethyl) ethyl] propenamide; cross-linked tetrapolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of sodium salt, potassium salt or ammonium salt; partially salified acrylic acid in the form of sodium salt, potassium salt or ammonium salt, N, N-dimethyl acrylamide and (2-hydroxyethyl) acrylate;

cross-linked terpolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially salified in the form of sodium salt, potassium salt or ammonium salt, N, N-dimethylacrylamide and (2-hydroxyethyl) acrylate;

The composition as defined above generally comprises from 0.5% to 20% by weight of thickening agent and from 1% to 15% by weight of active oxygen generating agent. It is generally in the form of an aqueous or hydro lotion. alcoholic, an aqueous or hydro-alcoholic gel, a gel-cream of a fluid emulsion or a cream. By hydro-alcoholic means any water-alcohol mixture cosmetically acceptable.

The composition which is the subject of the present invention may also comprise auxiliary agents usually used in cosmetic compositions and compositions for bleaching hair or hair. Examples of auxiliary agents that are more particularly used in the presence of active oxygen generating compounds include, for example, metal ion sequestering agents in the form of acids or salts such as sodium stannate and sodium pyrophosphate; ethylenediaminetetraacetic acid (EDTA) and its salts or agents making it possible to maintain the pH of said composition at an acceptable level for the skin, for example tromethamine or triethanolamine or cosmetically acceptable polyols, for example glycerol or xylitol alone. or mixed with xylitylglucoside and anhydroxylitol, mannitol or sorbitol. When the composition which is the subject of the present invention is an emulsion such as a milk or a cream, it also comprises ingredients usually used in the cosmetic and dermopharmaceutical fields and known to a person skilled in the art, such as fats (oils, butters and creams). , waxes, fatty acids and gums), or emulsifiers and co-emulsifiers, gelling agents and / or stabilizers and / or film-forming agents, and any other excipient or active ingredient provided that it does not react under the normal conditions of use. use and storage, such as, for example, temperature, brightness or pH conditions, with the active oxygen generating compound. Examples of oils that may be present in the composition that are the subject of the present invention include paraffins, isoparaffins, mineral white oils, vegetable oils, animal oils, synthetic oils, silicone oils and fluorinated oils. ; and more particularly :

- vegetable oils, such as sweet almond oil, coconut oil, castor oil, jojoba oil, olive oil, rapeseed oil, lemon peanut oil, sunflower oil, wheat germ oil, corn germ oil, soybean oil, cottonseed oil, alfalfa oil, coconut oil poppy oil, pumpkin oil, evening primrose oil, millet oil, barley oil, rye oil, safflower oil, passionflower, hazelnut oil, palm oil, shea butter, apricot kernel oil, calophyllum oil, sysymbrium oil, avocado oil, oil calendula, oils derived from flowers or vegetables; ethoxylated vegetable oils; oils of animal origin, such as squalene, squalane; mineral oils, such as paraffin oil, liquid petrolatum and isoparaffins; synthetic oils, especially fatty acid esters such as butyl myristate, propyl myristate, cetyl myristate, isopropyl palmitate, butyl stearate, hexadecyl stearate, isopropyl stearate octyl stearate, isocetyl stearate, dodecyl oleate, hexyl laurate, propylene glycol dicaprylate, esters derived from lanolic acid, such as isopropyl lanolate, isocetyl lanolate , monoglycerides, diglycerides and triglycerides of fatty acids such as glycerol triheptanoate, alkylbenzoates, polyalphaolefins, polyolefins such as polyisobutene, synthetic isoalkanes such as isohexadecane, isododecane, perfluorinated oils and silicone oils . Among these, mention may be made more particularly of dimethylpolysiloxanes, methylphenylpolysiloxanes, amine-modified silicones, silicones modified with fatty acids, silicones modified with alcohols, silicones modified with alcohols and fatty acids, and modified silicones. by polyether groups, modified epoxy silicones, silicones modified with fluorinated groups, cyclic silicones and silicones modified with alkyl groups.

Another fat which can be contained in the composition which is the subject of the present invention are fatty alcohols such as cetyl alcohol, stearyl alcohol or a mixture of these alcohols, or fatty acids.

The fatty phase of the composition according to the invention may also contain waxes such as beeswax; carnauba wax; candelilla wax; ouricoury wax; wax of Japan; wax of cork fiber or sugar cane; paraffin waxes; lignite waxes; microcrystalline waxes; lanolin wax; ozokerite; polyethylene wax; hydrogenated oils; silicone waxes; vegetable waxes; fatty alcohols and solid fatty acids at room temperature; glycerides solid at room temperature.

Among the emulsifiers that can contain the composition object of the present invention include for example fatty acids; ethoxylated fatty acids; fatty acid and sorbitol esters; ethoxylated fatty acid esters; polysorbates; polyglycerol esters; ethoxylated fatty alcohols; sucrose esters; alkylpolyglycosides; sulphated and phosphated fatty alcohols or mixtures of alkylpolyglycosides and fatty alcohols described in French patent applications 2,668,080, 2,734,496, 2,756,195, 2,762,317, 2,784,680, 2,784,904, 2,791 565, 2,790,977, 2,807,435 and 2,804,432, SENSANOV, FLUIDANOV.

The thickening agent used in the composition which is the subject of the present invention may, if desired, be combined with other thickening and / or emulsifying polymers, homopolymers or copolymers of acrylic acid or derivatives of acrylic acid. homopolymers or copolymers of acrylamide, homopolymers or copolymers of acrylamide derivatives, homopolymers or copolymers of acrylamidomethylpropanesulphonic acid, of vinyl monomer, of trimethylaminoethylacrylate chloride sold under the trade names CARBOPOL ™ Ultrez ™ 10, PEMULEN ™ TRl, PEMULEN ™ TR2, SIMULGEL ™ A, LUVIGEL ™ EM, ALC ARE ™ SC91, ALC ARE ™ SC92, ALC ARE ™ SC95, SALCARE ™ SC96, FLOCARE ™ ET100, HISPAGEL ™, SEPIGEL ™ 501, SEPIGEL ™ 502, SEPIPLUS, FLOCARE ™ ET58, STABILEZE ™ 06; hydrocolloids of vegetable or biosynthetic origin as per for example, xanthan gum, karaya gum, carrageenates, alginates; silicates; cellulose and its derivatives; starch and its hydrophilic derivatives; polyurethanes.

The subject of the invention is also a method for preparing a composition as defined above, comprising the following steps: a step (a1) for dispersing said inverse microlatex in water or in a hydro-alcoholic solvent;

A step (a1) of mixing at least one active oxygen generator with at least one cosmetically acceptable alcohol;

A step (b) of mixing the dispersion prepared in step (a1) with a fatty phase comprising at least one emulsifying agent, to form an emulsion and,

A step (c) of mixing the composition prepared in step (a1) with the emulsion formed in step (b).

The subject of the invention is also the use of the composition as defined above as an agent for bleaching hair and hair of the human or animal body. The subject of the invention is also the use of the composition as defined above, as a whitening gel for teeth.

Finally, a subject of the invention is a hair dye composition presented in the form of two distinct elements and comprising, as first element, a hair-bleaching composition consisting essentially of a composition as defined above and as a second element a dyeing composition comprising at least one coloring agent. capillary.

The following examples illustrate the invention without limiting it. EXAMPLE 1

Three homopolymers were synthesized with three different processes but perfectly known to those skilled in the art, from sodium 2-acrylamido-2-methyl-propanesulfonate (AMPS).

Polymer A is synthesized by inverse microemulsion polymerization and thus leads to a partially or completely saline poly (AMPS) inverse microlatex in the form of sodium salt, crosslinked with methylene-bis (acrylamide) (MBA), in isohexadecane . Polymer B is synthesized by inverse emulsion polymerization and thus leads to a partially or completely saline inverse poly (AMPS) latex in the form of sodium salt, crosslinked with MBA, in isohexadecane

Polymer C is obtained by precipitating polymerization and poly (AMPS) partially or completely salified in the form of sodium salt, crosslinked with MBA.

Three gels each comprising polymers A (Gel A according to the invention), B (Gel B according to the state of the art) and C (Gel C according to the state of the art) are prepared respectively, and active oxygen generating agent, hydrogen peroxide

(PEROXAL ™ 25 PG marketed in France by the company ARKEMA). Their viscosity, expressed in mPa.s, is measured over time with a rotating mobile viscometer.

BROOKFIELD ™ type LV with the mobile 4 and a speed of 6 revolutions per minute. For the tests stored at + 4 ° C. and at 45 ° C., the gel is brought to ambient temperature (approximately 25 ^° C.

± 2 ° C), 12 hours before taking measurements. The stability of the viscosity is expressed in

% relative to the initial viscosity measured the day after manufacture at room temperature. The results are recorded in the following table:

MA: Active matter

The above comparison shows that the polymer A (inverse microlatex) provides a higher viscosity stability than that provided by the polymer B (inverse latex) or the polymer C (polymer whatever the storage conditions.

EXAMPLE 2

Two copolymers were synthesized with two different processes but perfectly known to those skilled in the art, from AMP S and vinyl pyrrolidone (VP) [molar ratio: 90 (AMPS) / 10 (VP)].

Polymer D is synthesized by inverse microemulsion polymerization and thus leads to a partial microlatex of AMPS-VP copolymer (90-10) partially or completely salified in the form of sodium salt, crosslinked with (MBA), in MARCOL ™ 52, Polymer E is synthesized by inverse emulsion polymerization and thus leads to an inverse latex of copolymer AMPS-VP (90-10) partially or completely salified in the form of sodium salt, crosslinked with MBA, in MARCOL ™ 52

Two gels each comprising the polymers D (Gel D according to the invention) and E (Gel E according to the state of the art) respectively, and as active oxygen generating agent, hydrogen peroxide (PEROXAL) are prepared. ™ 25 PG). Their viscosity, expressed in mPa.s, is measured over time with a BROOKFIELD ™ LV type mobile rotating viscometer with the mobile 4 and a speed of 6 rpm. For the tests stored at + 4 ° C. and at 45 ° C., the gel is brought to ambient temperature (approximately 25 ^° C. ± 2 ° C.) for 12 hours before making the measurements. The stability of the viscosity is expressed in% relative to the initial viscosity measured the day after manufacture at ambient temperature. The results are recorded in the following table:

MA : Matière active

MA: Active matter

The above comparison shows that the polymer D (inverse microlatex) provides viscosity stability greater than that provided by the polymer E (inverse latex), whatever the storage conditions.

EXAMPLE 3

Two copolymers were synthesized with two different processes but perfectly known to those skilled in the art, from AMPS and 2-hydroxyethyl acrylate (AHE) [Molar ratio: 90 (AMPS) / 10 (AHE )]. The polymer F is synthesized by inverse microemulsion polymerization and thus leads to a micro-latex inverse copolymer AMPS-AHE (90-10), partially or completely salified as sodium salt, crosslinked with MBA, in squalane.

The polymer G is obtained by precipitating polymerization and leads to the partially or completely salted AMPS-AHE (90-10) copolymer in the form of sodium salt, crosslinked with MBA.

Two gels are prepared, each comprising the polymer F (Gel F according to the invention) and G (gel G according to the state of the art), and as active oxygen generating agent, hydrogen peroxide (PEROXAL ™ PG). Their viscosity, expressed in mPa.s, is measured over time with a BROOKFIELD ™ LV type mobile rotating viscometer with the mobile 4 and a speed of 6 rpm.

For the tests stored at + 4 ° C. and at 45 ° C., the gel is brought to ambient temperature (approximately 25 ^° C. ± 2 ° C.) for 12 hours before taking measurements.

The stability of the viscosity is expressed in% relative to the initial viscosity measured the day after manufacture at ambient temperature.

MA: Active matter

The above comparison shows that the polymer F (inverse microlatex) according to the invention provides a higher viscosity stability than that provided by the polymer G (polymer), whatever the storage conditions.

Examples of preparations of compositions according to the invention EXAMPLE 4 - Color Developing Gel

Polymer A 1.2%

Water Qs 100%

Glycerin 10%

Hydrogen peroxide 6%

Disodium EDTA (di Na) 0.02% phosphoric acid Qs pH = 4.3

The gel is prepared by adding the polymer according to the invention in water with mechanical stirring. The other ingredients are then added to the gel with stirring in the order indicated.

EXAMPLE 5 - revealing milk

Polymer D 1.8%

Water Qs 100%

Dimethicone 5%

Glycerin 10%

Hydrogen peroxide 7%

0.05% Potassium Stannate

Tromethamine Qs pH = 4.3

The gel is prepared by adding the polymer according to the invention in water with mechanical stirring. The other ingredients are then added to the gel with stirring in the order indicated.

EXAMPLE 6 - revealing cream:

A MONTANO V ™ 202 (Arachidyl Alcohol & Behenyl Alcohol & 5% Arachidyl Glucoside)

Paraffinum liquidum 5%

Cetyl alcohol 1% B Polymer F 0.5% AI

C Water Qsp 100%

D AQUAXYL ™ (Xylitylglucoside & Anhydroxylitol & Xylitol) 2%

Glycerin 3%

E Hydrogen peroxide 10% lactic acid Qs pH = 4.5

The fatty phase A and the aqueous phase B are heated separately at 80 ^° C. Phase B is added in the hot fatty phase, then this mixture (A + B) is added in phase A and emulsified a few minutes under high shear (turbine rotor / stator recommended). Phase D is added to the emulsion thus formed and it is then cooled with gentle stirring. Phase E is added at the end of manufacture, around 40 ^° C.

EXAMPLE 7 Bleaching Gel

Polymer F 2.3% AI

Water Qs 100% SEPICALM ™ VG (Sodium Palmitoyl Proline / Water Lily 2% albaflower extract)

Glycerin 3%

Hydrogen peroxide 6%

EDTA (di Na) 0.02%

Tromethamine Qs pH = 4.5

Perfume qs

The gel is prepared by adding the polymer according to the invention in water with mechanical stirring. The other ingredients are then added to the gel with stirring in the order indicated.

EXAMPLE 8 Dental whitening gel

Polymer A 1%

Water Qs 100% Glycerin 10%

Peroxide of urea 7%

Phosphoric acid Qs pH = 4.3

Perfume qs

The gel is prepared by adding the polymer according to the invention in water with mechanical stirring. The other ingredients are then added to the gel with stirring in the order indicated.

EXAMPLE 9 Dental Whitening Gel

Polymer D 2%

Water Qs 100%

Hydrogen peroxide 7%

Glycerin 5%

0.05% Sodium Stannate

Sodium saccharin 0.4%

Tromethamine Qs pH = 4.5

The gel prepared by adding the polymer according to the invention in water with mechanical stirring. The other ingredients are then added to the gel with stirring in the order indicated.

Claims

A composition comprising at least one active oxygen generating compound selected from hydrogen peroxide, alkali or alkaline earth metal perborates, alkali or alkaline earth metal percarbonates, alkali or alkaline earth metal persulfates , alkali or alkaline earth metal bromates, alkali or alkaline earth metal periodates, alkali or alkaline earth metal peroxides, alkali or alkaline earth metal persilicates, alkali or alkaline earth metal ferrocyanates , urea peroxide, melamine peroxide or a mixture of the above compounds, and at least one thickening agent, characterized in that the thickening agent is chosen from inverse microlatex comprising an oil phase, an aqueous phase, at least one emulsifying system capable of ensuring the formation of inverse microlatex, from 15% to 40% by weight, and preferably from 20% to 30% by weight, of a brominated polyelectrolyte or partially or completely salified terpolymers or tetrapolymers of 2-acrylamido-2-methyl propanesulfonic acid partially or totally salified with one or more monomers neutral chosen from acrylamide, N-methyl acrylamide, N, N-dimethylacrylamide, methacrylamide, diacetoneacrylamide, N-isopropylacrylamide, N- [2-hydroxy-1,1-bis (hydroxymethyl) ethyl] propenamide [or tris (hydroxymethyl) acrylamidomethane or N-tris (hydroxymethyl) methyl acrylamide also called THAM], (2-hydroxyethyl acrylate), (2,3-dihydroxypropyl) acrylate, methacrylate (2-hydroxyethyl), (2,3-dihydroxypropyl) methacrylate, an ethoxylated derivative of molecular weight between 400 and 1000, each of these esters or vinyl pyrrolidone and optionally with one or more monomers selected from monomers having a weak acid function partially or totally salified. 2. The composition as defined in claim 1, wherein the active oxygen generating compound is hydrogen peroxide. 3. Composition as defined in one of claims 1 or 2, wherein the polyelectrolyte constituting the inverse microlatex comprises between 95% and 25 mol% of 2-methyl 2 - [(1-oxo-2-propenyl) amino] 1-propanesulfonic acid monomer partially or totally salified and between 5% and 75 mol% of one or more neutral monomers. 4. The composition as defined in claim 3, wherein the polyelectrolyte constituting the inverse microlatex comprises between 90% and 40 mol% of acidic monomer. 2-methyl 2 - [(1-oxo-2-propenyl) amino] 1-propanesulfonic acid partially or totally salified and between 10% and 60 mol% of one or more neutral monomers. 5. Composition as defined in one of claims 1 to 4, wherein, when the polyelectrolyte constituting the reverse micro-latex, further comprises up to 30 mol% of one or more monomers having a weak acid function. 6. Composition as defined in one of claims 1 to 5, characterized in that the polyelectrolyte constituting the micro-latex inverse, is selected from: - crosslinked copolymers of 2-methyl 2 - [(1-oxo) 2-propenyl) amino] -propanesulfonic acid partially or totally salified in the form of ammonium salt, potassium salt or sodium salt and N, N-dimethyl acrylamide; crosslinked copolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of ammonium salt, potassium salt or sodium salt and acrylamide; crosslinked copolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially salified in the form of sodium salt, potassium salt or ammonium salt and N- [2-hydroxy-1,1-bis (hydroxymethyl) ethyl] propenamide; cross-linked copolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of ammonium salt, potassium salt or sodium salt and N-vinyl pyrrolidone; cross-linked copolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of ammonium salt, potassium salt or sodium salt and 2-hydroxyethyl acrylate; the crosslinked terpolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of ammonium salt, sodium salt or potassium or sodium salt, partially salified acrylic acid in the form of sodium salt, potassium salt or ammonium salt and N, N-dimethylacrylamide; cross-linked tetrapolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of ammonium salt, potassium salt or sodium salt, partially salified acrylic acid in the form of sodium salt, potassium salt or ammonium salt, N, N-dimethyl acrylamide and acrylamide; crosslinked terpolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of sodium salt, potassium salt or ammonium salt, N, N-dimethyl acrylamide and acrylamide; cross-linked terpolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially salified in the form of sodium salt, potassium salt or ammonium salt, N, N-dimethylacrylamide and N-isopropylacrylamide; crosslinked terpolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of sodium salt, potassium salt or ammonium salt, N, N-dimethylacrylamide and N- [2-hydroxy-1,1-bis (hydroxymethyl) ethyl] propenamide, crosslinked terpolymers of acrylamide, 2-methyl-2 - [(1-oxo-2-propenyl) amino] 1-propanesulfonic acid and partially salified acrylic acid in the sodium salt form, cross-linked tetrapolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially or totally salified in the form of sodium salt, potassium salt or ammonium salt, partially salified acrylic acid in the form of sodium salt, potassium salt or ammonium salt, N, N-dimethyl acrylamide and (2-hydroxyethyl) acrylate, cross-linked terpolymers of 2-methyl-2 - [(1-oxo-2-propenyl) amino] -propanesulphonic acid partially salified in the form of sodium salt, potassium salt or ammonium salt, N, N-dimethylacrylamide and (2-hydroxyethyl) acrylate. 7. Process for preparing a composition as defined in one of claims 1 to 6, comprising the following steps: A step (a1) for dispersing said inverse microlatex in water or in an aqueous-alcoholic solvent, A step (a1) of mixing at least one active oxygen generator with at least one cosmetically acceptable alcohol A step (b) of mixing the dispersion prepared in step (a1) with a fatty phase comprising at least one emulsifier, to form an emulsion and, a step (c) of mixing the composition prepared in step (a1) with the emulsion formed in step (b). 8. Use of the composition as defined in one of claims 1 to 6, as an agent for fading hair and hair of the human body. 9. Use of the composition as defined in one of claims 1 to 6, as a whitening gel teeth. 10. Hair dyeing composition presented in the form of two distinct elements and comprising as a first element, a hair bleaching composition consisting essentially of a composition as defined in one of claims 1 to 6 and as a second element, a dye composition comprising at least a hair coloring agent.