FR2994654A1 - Composition for bleaching keratin fibers e.g. hair, in compressed form comprises persulfate and polymer such as cationic or amphoteric polymer, where composition is different from composition having components such as urea/sodium persulfate - Google Patents

Abstract

A composition for bleaching keratin fibers, which is in compressed form comprises persulfate and polymer chosen from cationic polymers having charge density >= 4 milliequivalents per gram (meq/g) and/or amphoteric polymers, with the provision that composition is different from following composition containing e.g.: urea (3.5), sodium persulfate (8), Rheolate FX 1100 (RTM: copolymer of polyethylene glycol containing 136 mol of 3 ethylene oxide, stearyl alcohol polyoxyethylenated with 100 mol of ethylene oxide and hexamethylene diisocyanate (HDI)) (3), and magnesium stearate (2). A composition for bleaching keratin fibers, which is in compressed form, comprises at least one persulfate and at least one polymer chosen from cationic polymers having a charge density >= 4 milliequivalents per gram (meq/g), and/or amphoteric polymers, with the provision that the composition is different from the following composition: urea (3.5), sodium persulfate (8), ammonium chloride (4.5), potassium persulfate (47), ethylenediaminetetraacetic acid (1), sodium metasilicate (12), magnesium oxide (1), anatase titanium oxide (2), Kaolinite (5), vinylpyrrolidone/vinyl acetate copolymer (65/35) (1.8), Guar gum (2.7), hydrogenated polydecene (MW 549) (1.7), Merquat 280 SD (RTM: Polyquaternium 22) (0.5), Natrosol Plus 330 CS (RTM: cetylhydroxy cellulose) (1), Rheolate FX 1100 (RTM: copolymer of polyethylene glycol containing 136 mol of 3 ethylene oxide, stearyl alcohol polyoxyethylenated with 100 mol of ethylene oxide and hexamethylene diisocyanate (HDI)) (3), sodium cetostearyl sulfate (1), sodium lauryl sulfate (2.3) and magnesium stearate (2). An independent claim is included for process for bleaching keratin fibers, involving applying to the keratin fibers composition in the presence of an aqueous composition.

Description

The present invention relates to a composition for bleaching keratinous fibers, in particular hair, in compressed form, comprising at least one persulfate and at least one amphoteric polymer. The fading of human keratinous fibers, and more particularly of the hair, is by oxidation of the pigment "melanin" resulting in the solubilization and the partial or total elimination of this pigment.

To bleach the hair, use is made in particular of bleaching powders containing a peroxygenated reagent such as persulfates, perborates and percarbonates, of ammonium or of alkali metals, which are associated at the moment of use with an aqueous composition of peroxide peroxide. 'hydrogen. Since peroxygenated salts and hydrogen peroxide are relatively inefficient in acidic medium, it is often necessary to activate them at basic pH in order to obtain an adequate formation of active oxygen. It is therefore customary to add to the bleaching powders, alkaline compounds such as silicates and di or tribasic alkali or alkaline earth metal phosphates, and in particular alkali metal metasilicates, optionally in the presence of precursor agents. ammonia such as ammonium salts. Bleaching powders, however, tend to form dust during handling, transport and storage. However, the products that compose them (persulfates, alkali silicates) are aggressive and in particular irritating to the eyes, the respiratory tract and the mucous membranes.

In order to overcome the volatility problem of bleaching powders, less volatile powders have been developed by adding additives making it possible to reduce the level of fine particles and pastes which comprise the said pulverulent agents (peroxygenated salts, alkaline agents, thickeners) in an organic inert liquid carrier. However, these less volatile powders and pastes may be less effective than simple starting powders. Pasta, as well as powders, nevertheless require certain precautions when handling, especially when it comes to weigh them to mix with the oxidizing composition, to avoid staining clothes.

The object of the present invention is to provide a composition for the bleaching of keratinous fibers which makes it possible to solve the handling problems of the known compositions of the prior art, in particular a composition for the bleaching of keratin fibers in compressed form, comprising a persulfate and an amphoteric polymer, to be mixed directly at the time of use with an aqueous composition. This composition makes it possible to avoid handling problems related to the volatility of the powders or the weighing problems by proposing a product in the form of a compact solid and ready to use, without a dosage step. It also makes it possible to improve the resistance of the composition for the bleaching of keratinous fibers to temperature variations, and in particular makes it possible to avoid the problem of destabilization during storage at low temperatures and during transport including temperature cycles. It also prevents loss of lightening power.

These objects are achieved with the present invention which relates to a composition for bleaching keratin fibers in compressed form comprising at least one persulfate and at least one amphoteric polymer.

The composition according to the invention is in compressed or compacted form, that is to say that it has been obtained by a process of compression (or compaction) of particles, in particular by compression or compaction of a powder or granules.

Preferably, the discoloration composition in compressed form according to the invention has at least one dimension greater than 6 mm, preferably greater than or equal to 8 mm, preferably greater than or equal to 10 mm. In particular, it has at least one smaller dimension and at least one larger dimension, the largest dimension being greater than 6 mm, preferably greater than or equal to 8 mm, preferably greater than or equal to 10 mm. The composition according to the invention may be in the form of a tablet, in particular a tablet, lozenge, roller, etc., which may have flat or convex, concave or convex upper and lower faces and round, oval or square shapes, rectangular, octagonal, polygonal. According to one embodiment, the composition in compressed form may for example be in the form of a tablet or tablet of round shape; it may have a diameter ranging from 0.5 to 5 cm, in particular from 2 to 4 cm and a thickness ranging from 1 to 20 mm, in particular from 3 to 10 mm. According to one embodiment, the compressed form composition may be in the form of a tablet, it may have a length of 1 to 10 cm, a width of 0.5 to 5 cm and a thickness of 0.5 to 20 cm. mm, in particular from 1 to 10 mm. The composition in compressed form according to the invention may have a mass ranging from 0.5 to 20 grams, preferably from 5 to 15 grams. The composition according to the invention in compressed form may also be in the form of a tablet or tablet of round shape, it may then have a diameter ranging from 0.5 to 3 cm, in particular from 1 to 2 cm, and a thickness ranging from 1 to 20 mm, in particular 3 to 10 mm. It can thus have a mass ranging from 0.5 to 10 grams. The present invention also relates to a process for bleaching keratinous fibers comprising applying to the keratinous fibers the bleaching composition defined above, in the presence of an aqueous composition. The present invention also relates to a multi-compartment device comprising: - a bleaching composition in compressed form comprising at least one persulfate and at least one amphoteric polymer and - an aqueous composition, said compositions being packaged in compartments separated. Unless otherwise indicated, the ranges of the ranges of values which are given within the scope of the present invention are included in these ranges.

In what follows or what precedes the expression "at least one" is equivalent to the expression "one or more". Persulfates The bleaching composition according to the invention comprises at least one persulfate as a peroxygenated salt. Preferably, the persulfate (s) are chosen from persulfates of sodium, potassium and ammonium, and mixtures thereof.

The concentration of persulfates in the composition according to the invention is generally between 10 and 80% by weight, preferably between 20 and 70% by weight and better still between 40 and 65% by weight of the total weight of the composition.

Amphoteric Polymer The composition according to the invention comprises one or more amphoteric polymers. The amphoteric (or zwitterionic) polymers that may be used in accordance with the invention may be chosen from polymers comprising units B and C statistically distributed in the polymer chain where B denotes a unit derived from a monomer comprising at least one basic nitrogen atom. and C denotes a unit derived from an acidic monomer having one or more carboxylic or sulphonic groups, or B and C may denote groups derived from zwitterionic monomers of carboxybetaines or of sulphobetaines; B and C may also designate a cationic polymer chain comprising primary, secondary, tertiary or quaternary amine groups, in which at least one of the amine groups carries a carboxylic or sulphonic group connected via a hydrocarbon radical or else B and C are part of a chain of α, β-dicarboxylic ethylene-functional polymer, one of which has been reacted with a polyamine having one or more primary or secondary amine groups. The amphoteric polymers corresponding to the definition given above, which are more particularly preferred, are chosen from the following polymers: (1) the polymers comprising, as monomers, at least one monomer derived from a vinyl compound carrying a carboxylic group, such as, more particularly, acrylic acid, methacrylic acid, maleic acid, alpha-chloro acrylic acid, and at least one basic monomer derived from a substituted vinyl compound containing at least one basic atom chosen in particular from: a) dialkyl aminoalkyl methacrylates dialkyl aminoalkyl acrylates, dialkyl aminoalkyl methacrylamide and dialkyl aminoalkyl acrylamide. Such compounds are disclosed in U.S. Patent No. 3,836,537. B) Salts of trialkyl aminoalkyl methacrylates and trialkyl aminoalkyl acrylates, trialkylaminoalkylmethacrylamide and trialkylaminoalkylacrylamide salts. There may be mentioned in particular the acrylic acid / acrylamidopropyltrimethylammonium chloride copolymer proposed by Stockhausen under the name of Polymer W3794. It is also possible to mention the acrylic acid / acrylamidopropyltrimethylammonium chloride / acrylamide copolymers proposed by the Nalco Company. under the name Merquat 2001 and Merquat 2003. (2) polymers comprising units derived from: a) at least one monomer chosen from acrylamides or methacrylamides substituted on the nitrogen with an alkyl radical, b) with at least one an acidic comonomer containing one or more reactive carboxylic groups, and c) at least one basic comonomer such as primary, secondary, tertiary and quaternary amine substituent esters of acrylic and methacrylic acids and the quaternization product of dimethylaminoethyl methacrylate with the dimethyl or diethyl sulfate. The N-substituted acrylamides or methacrylamides which are more particularly preferred according to the invention are the groups in which the alkyl radicals contain from 2 to 12 carbon atoms and more particularly N-ethylacrylamide, N-tert-butyl acrylamide, N-tert-octyl acrylamide, N-octylacrylamide, Ndecylacrylamide, N-dodecylacrylamide and the corresponding methacrylamides.

The acidic comonomers are chosen more particularly from acrylic, methacrylic, crotonic, itaconic, maleic and fumaric acids as well as alkyl monoesters having 1 to 4 carbon atoms of maleic or fumaric acids or anhydrides.

Preferred basic comonomers are aminoethyl, butylaminoethyl, N, N'-dimethylaminoethyl, N-tert-butylaminoethyl methacrylates. The copolymers whose CTFA (4th Ed., 1991) name is octylacrylamide / acrylates / butylaminoethyl methacrylate copolymer, such as the products sold under the name AMPHOMER LV by the company National Starch, are particularly used. (3) copolymers comprising, as monomers, at least one monomer derived from a vinyl compound bearing a carboxylic group such as, more particularly, acrylic acid, methacrylic acid, maleic acid, alpha-chloro acrylic acid, and at least one diallyl dialkyl ammonium salt monomer, the alkyl groups having 1 to 6 carbon atoms. Preferably the alkyl group is a methyl group. Among these polymers, copolymers comprising as monomers dimethyldiallylammonium chloride and acrylic acid optionally combined with acrylamide are particularly preferred. The compounds proposed by the company NALCO under the trade names Merquat 280, Merquat 295, Merquat 3330, Merquat 3331 and Merquat 3333, (4) crosslinked polyamino amides and alkyls partially or totally derived from poyaminoamides of general formula can be mentioned in particular: Wherein R 10 represents a divalent radical derived from a saturated dicarboxylic acid, an aliphatic mono or dicarboxylic acid with an ethylenic double bond, an ester of an alkanol, and lower, having 1 to 6 carbon atoms of these acids or a radical derived from the addition of any of said acids with a primary bis or secondary bis amine, and Z denotes a radical of a polyalkylene polyamine bis -primaire, mono or bis-secondary and preferably represents: a) in the proportions of 60 to 100 mole%, the radical N (CH2), HH p where x = 2 and p = 2 or 3, or x = 3 and p = 2 this radical derived from diethylene triamine, triethylene tetraamine or dipropylene triamine; b) in the proportions of 0 to 40 mole%, the radical (II) above, in which x = 2 and p = 1 and which is derived from ethylenediamine, or the radical derived from piperazine: -NN \ c) in the proportions of 0 to 20 mole%, the radical -NH- (CH 2) 6 -NH- derived from hexamethylenediamine, these polyaminoamines being crosslinked by addition of a bifunctional crosslinking agent chosen from epihalohydrins, diepoxides, dianhydrides, bis unsaturated derivatives, by means of 0.025 to 0.35 mole of crosslinking agent per amine group of the polyaminoamide and alkyls by the action of acrylic acid, chloroacetic acid or an alkane sultone or their salts. The saturated carboxylic acids are preferably chosen from acids having 6 to 10 carbon atoms, such as adipic acid, trimethyl 2,2,4-adipic acid and 2,4,4-trimethyl adipic acid, terephthalic acid, ethylenic double bond such as acrylic acid, methacrylic acid, itaconic acid.

The alkanesultones used in the alkylation are preferably propane or butane sultone, the salts of the alkylating agents are preferably the sodium or potassium salts, (5) the polymers comprising zwitterionic units of formula: R12 R14 Wherein R 11 denotes a polymerizable unsaturated group such as an acrylate, methacrylate, acrylamide or methacrylamide group, y and z represents an integer of 1 to 10, wherein R 11 denotes a polymerizable unsaturated group such as an acrylate, methacrylate, acrylamide or methacrylamide group; 3, R12 and R13 represent a hydrogen, methyl, ethyl or propyl atom, R14 and R15 represent a hydrogen atom or an alkyl radical such that the sum of the carbon atoms in R14 and R15 does not exceed 10. Polymers comprising such units may also comprise units derived from non-zwitterionic monomers such as dimethyl or diethylaminoethyl acrylate or methacrylate or alkyl acrylates or methacrylates, acrylamides or methacrylamides or vinyl acetate. By way of example, mention may be made of the copolymer of methyl methacrylate / methyl dimethyl carboxymethylammonio ethyl methacrylate such as the product sold under the name DIAFORMER Z301 by the company SANDOZ. (6) polymers derived from chitosan having monomeric units corresponding to the following formulas: ## STR1 ## ## STR2 ## ## STR2 ## Wherein the unit D is present in proportions of between 0 and 30%, the unit E in proportions of between 5 and 50% and the unit F in proportions of between 30 and 90%, it being understood that in this case F, R16 represents a radical of formula: R19 R17 C (O) c7? in which if q = 0, R 17, R 18 and R 19, which may be identical or different, each represent a hydrogen atom, a methyl, hydroxyl, acetoxy or amino residue, a monoalkylamine residue or a dialkylamine residue optionally interrupted by one or more carbon atoms. nitrogen and / or optionally substituted by one or more amine, hydroxyl, carboxyl, acoylthio, sulfonic acid groups, an alkylthio radical whose alkyl group carries an amino residue, at least one of the radicals R17, R18 and R19 being in this case a hydrogen atom; or if q = 1, R 17, R 18 and R 19 each represent a hydrogen atom, as well as the salts formed by these compounds with bases or acids, (7) Polymers derived from the N-carboxyalkylation of chitosan such as N -carboxymethyl chitosan or N-carboxybutyl chitosan proposed under the name "EVALSAN" powder by the company JAN DEKKER, (8) The polymers having units corresponding to the general formula (IV) are described in French Patent 1,400,366: R20 ( In which R 20 represents a hydrogen atom, a radical CH 3 0, CH 3 CH 2 O, phenyl, R 21 denotes hydrogen or a lower alkyl radical such as methyl, ethyl, R 22 denotes l hydrogen or a lower alkyl radical such as methyl, ethyl, R23 denotes a lower alkyl radical such as methyl, ethyl or a radical corresponding to the formula: -R24-N (R22) 2, R24 representing a group -CH2-CH2- , -CH2-CH2-CH2-, -CH2-CH (CH3) -, R22 having the above-mentioned ignitions, as well as the higher homologues of these radicals and containing up to 6 carbon atoms, (9) the amphoteric polymers of the -DXDX type chosen from: a) the polymers obtained by the action of chloracetic acid or sodium chloroacetate on compounds comprising at least one unit of formula: -DXDXD- (V) where D denotes a radical (CH CH2) -NN1 and X denotes the symbol E or E ', E or E' which are identical or different denote a divalent radical which is a straight or branched chain alkylene radical having up to 7 carbon atoms in the unsubstituted or hydroxyl-substituted chain and may further include oxygen, nitrogen, sulfur, 1 to 3 aromatic and / or heterocyclic rings; the oxygen, nitrogen and sulfur atoms being present in the form of ether, thioether, sulfoxide, sulfone, sulfonium, alkylamine, alkenylamine, hydroxyl groups, benzylamine, amine oxide, quaternary ammonium, amide, imide groups, alcohol, ester and / or urethane. b) polymers of formula: -D-X-D-X- (VI) where D denotes a radical -N N \ and X denotes the symbol E or E 'and at least once E'; E having the meaning indicated above and E 'is a divalent radical which is a straight or branched chain alkylene radical having up to 7 carbon atoms in the main chain, substituted or unsubstituted by one or more hydroxyl radicals and having a or a plurality of nitrogen atoms, the nitrogen atom being substituted by an optionally interrupted alkyl chain by an oxygen atom and necessarily comprising one or more carboxyl function or one or more hydroxyl functions and betaineized by reaction with chloroacetic acid or sodium chloroacetate, (10) alkyl (C1-C5) vinyl ether / maleic anhydride copolymers partially modified by semiamidation with an N, N-dialkylaminoalkylamine such as N, N-dimethylaminopropylamine or by semi-esterification with N, Ndialcanolamine. These copolymers may also comprise other vinylic comonomers such as vinylcaprolactam, and mixtures thereof.

The amphoteric polymers which are particularly preferred according to the invention are those of families (1) and (3). In particular, mention may be made of amphoteric polymers chosen from acrylic acid / acrylamidopropyltrimethylammonium chloride copolymers and acrylic acid / chloride copolymers. acrylamidopropyl trimethylammonium / acrylamide, the copolymers comprising, as monomers, dimethyldiallylammonium chloride and acrylic acid optionally combined with acrylamide, and mixtures thereof.

The compounds of the family (1) and among them the acrylic acid / acrylamidopropyltrimethylammonium chloride copolymer are particularly preferred. In one variant of the invention, the amphoteric polymer or polymers used in the composition according to the invention are in the form of powders, that is to say, if appropriate in dehydrated and / or desolvated form. In the composition of the invention, the amphoteric polymer or polymers preferably represent from 0.01 to 10%, preferably from 0.05 to 7% and even more preferentially from 0.1 to 5% by weight, relative to the total weight. of the composition. Alkaline agent The bleaching composition according to the invention may comprise at least one alkaline agent. The alkaline agent (s) may for example be chosen from ammonium dihydrogen phosphate or tribasic ammonium phosphate, water-soluble silicates such as alkali metal or alkaline-earth metal silicates such as sodium disilicate, sodium metasilicate, di-phosphates and the like. basic or tribasic alkali or alkaline earth metals or alkali or alkaline earth metal carbonates, such as lithium, sodium, potassium, magnesium, calcium, barium, and mixtures thereof. Preferably, the alkaline agent (s) are chosen from water-soluble silicates such as alkali metal or alkaline-earth metal silicates, basic or tribasic alkali metal or alkaline earth metal phosphates, alkali or alkaline-earth metal carbonates, and their mixtures. In the context of the invention, the term "water-soluble silicate" means a silicate which has a solubility in water at 25 ° C. of greater than 0.5 (%), preferably greater than 1% by weight. These water-soluble silicates differ from aluminum silicates and their derivatives, especially clays, such as mixed silicates of natural or synthetic origin which are insoluble in water. When present in the composition according to the invention, the concentration of alkaline agents generally varies from 0.1 to 40% by weight, preferably from 0.5 to 30% by weight, and better still from 1 to 25% by weight. by weight of the total weight of the composition. Rheology modifying agents According to one embodiment, the bleaching composition according to the invention advantageously comprises at least one rheology modifier selected from hydrophilic thickeners, amphiphilic polymers comprising at least one hydrophobic chain, fillers and mixtures thereof.

These agents are distinct from the amphoteric polymer (s) described above. The rheology modifying agents may be present in a content ranging from 0.01% to 30% by weight relative to the total weight of the composition, preferably from 0.1% to 10% by weight.

As examples of hydrophilic thickeners, that is to say not comprising a C6-C30 hydrocarbon fatty chain, which can be used according to the invention, mention may be made in particular of: - thickening polymers of natural origin, such as a) extracts algae, such as alginates (such as alginic acid and sodium alginates), carrageenans, agar agars, and mixtures thereof. As examples of carrageenans, mention may be made of Satiagum UTC30® and UTC10® from Degussa; as alginates, mention may be made of sodium alginate sold under the name Kelcosol® by the company ISP; (b) gums, such as xanthan gum, guar gum and their nonionic derivatives (hydroxypropyl guar), gum arabic, konjac gum or mannan, tragacanth gum, ghatti gum, karaya gum, carob gum; agar gum, scleroglucan gums and mixtures thereof; (c) starches, preferably modified starches, such as those derived, for example, from cereals such as wheat, maize or rice, from vegetables such as sweet peas, from tubers such as potatoes or cassava, starches from tapioca; carboxymethyl starch. By way of example of starches, mention may be made of "STARX 15003" corn starch marketed by Staley, the pre-gelatinized starch sold under the name "LYCATAB PGS" by Roquette; sodium carboxymethyl starch marketed under the reference "EXPLOTAB" by Roquette; (d) dextrins, such as dextrin extracted from corn; e) celluloses such as microcrystalline cellulose, amorphous cellulose, and cellulose derivatives, in particular hydroxyalkyl (C 1 -C 6) celluloses and carboxyalkyl (C 1 -C 6) celluloses, in particular crosslinked, mention may be made especially of methylcelluloses, hydroxyalkylcelluloses, ethylhydroxyethylcelluloses, carboxymethylcelluloses. As examples, mention may be made of the microcrystalline cellulose sold under the name "AVICEL PH 100 or pH102" by the company FMC Biopolymers; f) pectins, g) chitosan and its derivatives, h) anionic polysaccharides other than starch and cellulose derivatives, in particular of biotechnological origin, such as the anionic polysaccharide having as a repeating unit a tetrasaccharide composed of L-fucose, D-glucose and glucuronic acid, such as that bearing the INCI name Biosaccharide Gum-4 sold under the reference GLYCOFILM 1.5P by the company Solabia, i) soy polysaccharides, and mixtures thereof. synthetic polymers such as crosslinked or non-crosslinked polyvinylpyrrolidone, such as, for example, crosslinked polyvinylpyrrolidone, for example the "KollindonCl" marketed by BASF, acrylic acid polymers and their salts, such as crosslinked polyacrylates, such as the one sold on the market; by the company Rohm and Haas under the reference "ACUSOL 772", polyacrylamides, polymers (in particular homopolymers) of cross-linked or non-crosslinked poly-2-acrylamidopropanesulphonic acids such as non-cross-linked poly-2-acrylamidopropanesulphonic acid (Simugel ® EG from Seppic), cross-linked poly-2-acrylamido-2-methylpropane sulfonic acid, free or partially neutralized with ammonia (Hostacerin® AMPS from Clariant), poly-2- acid mixtures acrylamido-2-methylpropanesulphonic acid uncrosslinked with hydroxyalkylcellulose ethers or with poly (ethylene oxide) as they are described in US Pat. No. 4,540,510; mixtures of poly (meth) acrylamidoalkyl (C1-C4) -sulfonic acid, preferably crosslinked, with a crosslinked copolymer of maleic anhydride and a (C1-C5) alkyl vinyl ether (Stabileze QM) ISF). The amount of hydrophilic thickening agents present in the composition according to the invention may be between 0.01 and 30% and preferably between 0.1 and 15% by weight and better still between 0.1 and 10% by weight relative to to the total weight of the composition. The composition according to the invention may comprise at least one amphiphilic polymer comprising at least one hydrophobic chain, distinct from the amphoteric polymer (s) described above. More specifically, these amphiphilic polymers, if present, are of the nonionic, anionic, cationic or amphoteric type. They are preferably of nonionic, anionic or cationic nature. Said amphiphilic polymers comprise, more particularly, as a hydrophobic chain, a hydrocarbon chain, saturated or unsaturated, aromatic or non-aromatic, linear or branched, C 6 -C 30, contiguous to optionally one or more oxyalkylenated units (oxyethylenated and / or oxypropylenated ). Among the cationic amphiphilic polymers comprising a hydrophobic chain, cationic polyurethanes or cationic copolymers comprising vinyllactam units and in particular vinylpyrrolidone units may be found. Even more preferably, the amphiphilic polymers comprising a hydrophobic chain are of nonionic or anionic nature. Examples of hydrophobic chain nonionic amphiphilic polymers include, among others, celluloses comprising a hydrophobic chain (Natrosol Plus Grade 330 CS® from Aqualon, Bermocoll EHM 100® from Berol Nobel, Amercell Polymer HM -1500® from Amerchol); hydroxypropyl guars modified with one or more hydrophobic groups (Jaguar XC-95 / 3®, RE210-18, RE205-1, from Rhodia Chimie, Esaflor HM 22® from Lamberti); copolymers of vinylpyrrolidone and of hydrophobic chain monomers (certain products of the Antaron®, Ganex® ranges of the company I.S.P); copolymers of C1-C6 alkyl (meth) acrylates and of amphiphilic monomers comprising a hydrophobic chain; copolymers of hydrophilic (meth) acrylates and of monomers comprising at least one hydrophobic chain (polyethylene glycol methacrylate / lauryl methacrylate copolymer); polymers with an aminoplast ether skeleton having at least one fatty chain (Pure Thix® from Süd-Chemie); polyether polyurethanes, linear (block structure), grafted or star-shaped, comprising in their chain, at least one hydrophilic block and at least one hydrophobic block (as described in the article by G. Fonnum, J. Bakke and Fk Hansen-Colloid Polym Sci 271, 380.389 (1993), in particular the polyether polyurethane obtainable by polycondensation of at least three compounds comprising (i) at least one polyethylene glycol comprising from 150 to 180 moles of diene oxide. ethylene, (ii) a polyoxyethylenated stearyl alcohol comprising 100 moles of ethylene oxide and (iii) a diisocyanate, such as sold in particular by the company ELEMENTIS under the name RHEOLATE FX 1100 ®, which is a polyethylene glycol polycondensate at 136. moles of ethylene oxide, stearyl alcohol polyoxyethylenated to 100 moles of ethylene oxide and hexamethylene diisocyanate (HDI) having a weight average molecular weight of 30000 (INCI name: PEG-136 / Ste areth-1001 / SMDI Copolymer), Mention may also be made of Rheolate 205, 208, 204 or 212 from Rheox; Elfacos ™ T210, T212 from the company Akzo).

As examples of anionic amphiphilic polymers comprising at least one hydrophobic chain that may be used in the context of the present invention, mention may be made of the polymers, crosslinked or otherwise, comprising at least one hydrophilic unit derived from one or more unsaturated monomers. ethylene group carrying a carboxylic acid function, free or partially or totally neutralized, and at least one hydrophobic unit derived from one or more ethylenically unsaturated monomers carrying a hydrophobic side chain, and optionally at least one crosslinking unit derived from one or more several polyunsaturated monomers.

Mention may in particular be made of copolymers of (meth) acrylic acid and of C10-C30 alkyl (meth) acrylates, which are crosslinked or non-crosslinked, such as those described in US Pat. No. 3,915,921 and US Pat. No. 4,9999,49 or acid copolymers (meth) ) acrylic and allyl ethers of fatty alcohols such as those described in EP 216479.

In addition, Carbopol ETD-2020® and 1382®, Pemulen TRIO and TR2® products from Goodrich; methacrylic acid / ethyl acrylate / stearyl methacrylate oxyethylenated copolymer (55/35/10); (meth) acrylic acid / ethyl acrylate / behenyl methacrylate oxyethylenated EO copolymer; the crosslinked methacrylic acid / ethyl acrylate / steareth-10 allyl ether copolymer are suitable polymers for carrying out the invention. If these amphiphilic polymers are present, their total content represents from 0.01 to 30% by weight, preferably from 0.1 to 10% by weight relative to the weight of the composition.

By "fillers" is meant solid particles insoluble in the medium of the composition regardless of the temperature at which the composition is made. The fillers may be colorless or white, inorganic or organic, of any physical form (platelet, spherical or oblong), and of any crystallographic form (for example, in sheets, cubic, hexagonal, orthorhombic, etc.). The fillers may be porous or non-porous. As fillers, mention may be made of mineral fillers such as hydrophobic or hydrophilic silicas, clays other than those mentioned above, ceramic beads, calcium carbonate, titanium oxides, magnesium oxides, aluminum silicates and their derivatives, in particular clays, such as mixed silicates of natural or synthetic origin, in particular aluminum and magnesium silicates, in particular hydrated silicates, and natural hydrated aluminum silicates, such as bentonite or kaolin, talc, organic fillers such as nylon, microspheres based on vinylidene chloride / acrylonitrile / methacrylonitrile copolymer enclosing isobutane, expanded such as those sold under the name EXPANCEL 551 DE® by Expancel, micronized vegetable powder ( as the fruit powders of the company LESSONIA) or non-micronized, or the powder of shells of grains of rice, and their melan ges. Mention may also be made of silicas, in particular pyrogenic silicas of hydrophilic nature (in particular Aerosil® 90, 130, 150, 200, 300 and 380, from Degussa Hüls). Some of the rheology modifying agents mentioned above may also have a role in assisting the disintegration of the discoloration composition in compressed form during its use. Thus, in a particular embodiment, the composition according to the invention comprises at least one disintegrant chosen from celluloses, in particular microcrystalline cellulose, and cellulose derivatives, crosslinked polyacrylates, crosslinked polyvinylpyrrolidone, and soy polysaccharides. alginates, aluminum silicates and their derivatives, silicas, in particular hydrophilic silicas and mixtures thereof. Surfactants The composition according to the invention may advantageously comprise at least one surfactant. The surfactant or surfactants can be indifferently chosen, alone or in mixtures, from anionic, amphoteric, nonionic, zwitterionic and cationic surfactants, in particular from anionic and / or nonionic surfactants. The surfactants that are suitable for the implementation of the present invention are in particular the following: Among the nonionic surfactants, mention may be made of alcohols, alpha-diols and alkylphenols, each of these compounds being polyethoxylated and / or polypropoxylated, and having at least one less a hydrocarbon chain comprising, for example, from 8 to 30 carbon atoms, preferably from 8 to 18 carbon atoms, the number of ethylene oxide and / or propylene oxide groups possibly ranging from 2 to 200. mention copolymers of ethylene oxide and propylene oxide, condensates of ethylene oxide and / or propylene oxide on fatty alcohols; polyethoxylated fatty amides preferably having from 2 to 30 moles of ethylene oxide; oxyethylenated sorbitan fatty acid esters having from 2 to 30 moles of ethylene oxide; sucrose fatty acid esters, polyethylene glycol fatty acid esters, alkyl polyglycosides, N-alkyl glucamine derivatives, and the like. The term "anionic surfactant" is understood to mean a surfactant comprising as ionic or ionizable groups only anionic groups. These anionic groups are preferably chosen from the groups CO2H, 002-, SO3H, SO3-, OSO3H, OSO3-, O2PO2H, O2PO2H-, O2PO2-. The anionic surfactant (s) that may be used in the compositions of the invention are especially chosen from alkyl sulphates, alkyl ether sulphates, alkyl amido ether sulphates, alkylaryl polyether sulphates, monoglyceride sulphates, alkyl sulphonates, alkyl amide sulphonates, alkyl aryl sulphonates, alpha-olefin-sulfonates, paraffinsulfonates, alkylsulfosuccinates, alkylethersulfosuccinates, alkylamidesulfosuccinates, alkylsulphoacetates, acylsarcosinates, acylglutamates, alkylsulfosuccinamates, acylisethionates and N-acyltaurates, monoesters salts of alkyl and polyglycoside-polycarboxylic acids, acyllactylates, D-galactoside-uronic acid salts, alkyl ether-carboxylic acid salts, alkyl aryl ether carboxylic acid salts, alkyl amidoether acid salts -carboxylic; or the non-salified forms of all these compounds, the alkyl and acyl groups of all these compounds having from 6 to 24 carbon atoms and the aryl group denoting a phenyl group. Some of these compounds can be oxyethylenated and then preferably comprise from 1 to 50 ethylene oxide units.

The salts of C6-24 alkyl monoesters and polyglycoside-polycarboxylic acids may be selected from C6-24 alkyl polyglycoside citrates, C6-24 alkyl polyglycoside tartrates and polyglycoside sulfosuccinates. C6-C24 alkyl. When the agent or the anionic surfactants are in the salt form, they may be chosen from alkali metal salts such as the sodium or potassium salt and preferably sodium salt, ammonium salts, amine and especially aminoalcohol salts, and alkaline earth metal salts such as magnesium salt. By way of example of aminoalcohol salts, mention may be made in particular of the salts of mono-, di- and triethanolamine, the salts of mono-, di- or tri-isopropanolamine, the salts of 2-amino-2-methyl 1-propanol, 2-amino-2-methyl-1,3-propanediol and tris (hydroxymethyl) amino methane. The alkali metal or alkaline earth metal salts and in particular the sodium or magnesium salts are preferably used.

Alkyl (C6-24) sulphates, alkyl (C6-24) ether sulphates, optionally oxyethylenated, comprising from 2 to 50 ethylene oxide units, and mixtures thereof, in particular in the form of alkali metal or alkaline salts, are preferably used. -terrous, ammonium, aminoalcohol. More preferably, the anionic surfactant (s) are chosen from (C 10-20) alkyl sulphates in the form of alkali metal or alkaline earth metal salts, and in particular sodium lauryl sulphate and sodium cetostearyl sulphate, and mixtures thereof. The amphoteric or zwitterionic surfactant (s) that may be used in the present invention may be in particular derivatives of secondary or tertiary aliphatic amines, optionally quaternized, in which the aliphatic group is a linear or branched chain containing from 8 to 22 carbon atoms. said amine derivatives containing at least one anionic group such as, for example, a carboxylate, sulfonate, sulfate, phosphate or phosphonate group. Mention may in particular be made of (C 8 -C 20) alkyl betaines, sulphobetaines, (C 8 -C 20) alkylamido (C 3-8 alkyl) betaines or (C 8 -C 20) alkylamido (C 6 -C 8 alkyl) ) sulfobetaines. Among the derivatives of secondary or tertiary aliphatic amines, optionally quaternized, which may be used, as defined above, there may also be mentioned the compounds of the following respective structures (B1) and (B2): Ra-C (O) -NH-CH2 -CH2-N + (Rb) (Rc) -CH2C (O) O-, M +, X- (B1) Formula wherein: Ra represents a C1-C30 alkyl or alkenyl group derived from an acid RaCOOH, preferably present in hydrolyzed coconut oil, a heptyl, nonyl or undecyl group; Rb represents a beta-hydroxyethyl group; and Rc is carboxymethyl; M + represents a cationic counterion derived from an alkali metal, alkaline earth metal, such as sodium, an ammonium ion or an ion derived from an organic amine, and X - represents an organic or inorganic anionic counterion, such as that selected from halides, acetates, phosphates, nitrates, (C 1 -C 4) alkyl sulphates, (C 1 -C 4) alkyl or (C 1 -C 4) alkylarylsulfonates, in particular methylsulphate and ethylsulphate; or else M + and X- are absent; Ra'-C (O) -NH-CH 2 -CH 2 -N (B) (B ') (B2) Formula wherein: B is -CH 2 -CH 2 -O-X'; B 'represents the group - (CH2) zY', with z = 1 or 2; X 'represents the group -CH2-C (O) OH, -CH2-C (O) OZ', -CH2-CH2-C (O) OH, -CH2-CH2-C (O) OZ ', or hydrogen atom; Y 'represents the group -C (O) OH, -C (O) OZ', -CH2-CH (OH) -SO3H or the group -CH2-CH (OH) -SO3-Z '; Z 'represents a cationic counterion derived from an alkaline or alkaline earth metal, such as sodium, an ammonium ion or an ion derived from an organic amine; Ra 'represents a C10-C30 alkyl or alkenyl group of an acid Ra'-C (O) OH preferably present in coconut oil or in hydrolyzed linseed oil, an alkyl group, especially C17 and its iso form, an unsaturated C17 group.

These compounds are classified in the CTFA dictionary, 5th edition, 1993, under the names cocoamphodiacétate disodium, lauroamphodiacétate disodium, caprylamphodiacétate disodium, capryloamphodiacétate disodium, cocoamphodipropionate disodium, lauroamphodipropionate disodium, caprylamphodipropionate disodium, capryloamphodipropionate disodium, acid lauroamphodipropionic, cocoamphodipropionic acid. By way of example, mention may be made of cocoamphodiacetate marketed by Rhodia under the trade name MIRANOL® C2M concentrate. It is also possible to use compounds of formula (B'2); Ra "-NH-CH (Y") - (CH2) nC (O) -NH- (CH2) n -N (Rd) (Re) (B'2) Formula wherein: Y Y represents the group - C (O) OH, -C (O) OZ-, -CH2-CH (OH) -SO3H or the group -CH2-CH (OH) -SO3-Z-; Rd and Re, independently one of the further represent a C 1 -C 4 alkyl or hydroxyalkyl radical; represents a cationic counterion derived from an alkali metal or alkaline earth metal, such as sodium, an ammonium ion or an ion derived from an organic amine; "Ra" represents a C10-C30 alkyl or alkenyl group of an acid Ra "-C (O) OH preferably present in coconut oil or in hydrolysed linseed oil. and n ', independently of one another, denotes an integer ranging from 1 to 3. Among the compounds of formula (B'2), there may be mentioned the compound classified in the CTFA dictionary under the name sodium diethylaminopropyl. cocoaspartamide and marketed by CHIMEX under the name CHIMEXANE HB. Among the amphoteric or zwitterionic surfactants mentioned above, use is preferably made of (C 8 -C 20) betaines such as cocobetaine, (C 8 -C 20) alkylamido (O-C 8) betaines such as cocamidopropyl betaine, and mixtures thereof, compounds of formula (B'2) such as the sodium salt of diethylaminopropyl laurylamino succinamate (INCI name: sodium diethylaminopropyl cocoaspartamide). More preferably, the amphoteric or zwitterionic surfactant (s) is (are) chosen from cocamidopropylbetaine and cocobetaine, the sodium salt of diethylaminopropyl laurylamino succinamate, or mixtures thereof. The amounts of surfactants present in the composition according to the invention may vary from 0.01 to 30% and preferably from 0.1 to 20% by weight and better still from 0.5 to 10% by weight of the total weight of the composition. Organic Inert Phase The composition according to the invention may comprise at least one organic inert phase. By "inert" is meant not entailing a rapid destruction of persulfates, that is to say not causing a decrease in the persulfate level of more than 50% in 24 hours at room temperature. Preferably the organic inert phase is a fatty phase consisting of one or more fatty substances.

By "fatty substance" is meant an organic compound which is insoluble in water at ordinary temperature (25 ° C.) and at atmospheric pressure (760 mmHg) (solubility of less than 5% and preferably of 1%, even more preferentially at 0.1%). The fatty substances have in their structure at least one hydrocarbon chain containing at least 6 carbon atoms or a chain of at least two siloxane groups. In addition, the fatty substances are generally soluble in organic solvents under the same conditions of temperature and pressure, such as, for example, chloroform, dichloromethane, carbon tetrachloride, ethanol, benzene, toluene, tetrahydrofuran ( TH F), vaseline oil or decamethylcyclopentasiloxane. The fatty substances of the invention do not contain a salified carboxylic acid group (s). In particular, the fatty substances of the invention are also not (poly) oxyalkylenated nor (poly) glycerolated ethers.

Preferably, the composition comprises a liquid organic inert phase (or liquid fatty phase), comprising oils as fatty substance. By liquid phase is meant in the sense of the present invention any phase capable of flow at ambient temperature, generally between 15 ° C and 40 ° C, and at atmospheric pressure, under the action of its own weight.

By "oil" is meant a "fat" which is liquid at room temperature (25 ° C), and at atmospheric pressure (760 mm Hg). The organic inert liquid phase may in particular be chosen from polydecenes of formula C10n1-1 [(20n) +2] in which n varies from 3 to 9 and preferably from 3 to 7, liquid fatty alcohols, alcohol esters and fatty acids or fatty acids, esters or diesters of 0-12-024 fatty acid sugars, cyclic ethers or cyclic esters, silicone oils, mineral oils or vegetable oils, or mixtures thereof.

The compounds of formula Cion H [(20n) + 2] with n varying from 3 to 9 correspond to the name "polydecene" of the CTFA Dictionary 7th edition 1997 of the Cosmetic, Toiletry and Fragrance Association, USA, as well as to the same appellation INCI in the USA and Europe. They are hydrogenation products of poly-1-decenes.

Among these compounds, it is preferred according to the invention for which, in the formula, n varies from 3 to 7. Mention may be made, by way of example, of the product sold under the name Silkflo® 366 NF Polydecene by the company Amoco Chemical, those sold under the name Nexbase® 2002 FG, 2004 FG, 2006 FG and 2008 FG by the company 20 Fortum. As regards esters of fatty alcohols or of fatty acids, mention may be made by way of example: esters of linear or branched C306 saturated lower monohydric alcohols with monofunctional C 12 -C 24 fatty acids, the latter Which may be linear or branched, saturated or unsaturated and chosen in particular from oleates, laurates, palmitates, myristates, behenates, cocoates, stearates, linoleates, linolenates, caprates, arachidonates, or mixtures thereof such as in particular oleo-palmitates, oleostearates , palmito-stearates. Among these esters, it is more particularly preferred to use isopropyl palmitate, isopropyl myristate and octyl dodecyl stearate. esters of C 3 -C 8 linear or branched monohydric alcohols with bifunctional C 8 -C 24 fatty acids, the latter possibly being linear or branched, saturated or unsaturated, such as, for example, the isopropyl di-ester of sebacic acid, called also di-isopropyl sebacate, esters of linear or branched C 3 -C 8 monohydric alcohols, with bifunctional C 2 -C 8 fatty acids, the latter possibly being linear or branched, saturated or unsaturated, such as, for example, di-adipate; octyl and di-caprylyl maleate; the ester of a trifunctional acid such as triethyl citrate. With regard to esters and diesters of C 12 -C 24 fatty acid sugars, the term "sugar" means compounds which have several alcohol functional groups, with or without an aldehyde or ketone function, and which comprise at least 4 atoms. of carbon. These sugars can be monosaccharides, oligosaccharides or polysaccharides. As sugars that can be used according to the invention, mention may be made, for example, of sucrose (or sucrose), glucose, galactose, ribose, fuctose, maltose, fructose, mannose, arabinose, xylose, lactose , and their especially alkyl derivatives, such as methyl derivatives such as methylglucose. The esters of sugars and fatty acids that can be used according to the invention can be chosen especially from the group comprising the esters or mixtures of sugar esters described above and linear or branched, saturated C12-O24 fatty acids. or unsaturated. The esters may be chosen from mono-, di-, tri- and tetraesters, polyesters and mixtures thereof. These esters may be, for example, chosen from oleates, laurates, palmitates, myristates, behenates, cocoates, stearates, linoleates, linolenates, caprates, arachidonates, or mixtures thereof, such as in particular mixed oleo-palmitate, oleostearate and palmito-stearate esters. . More particularly, it is preferred to use the mono- and diesters and especially mono- or dioleates, stearates, behenates, oleopalmitates, linoleates, linolenates, oleostearates, sucrose, glucose or methylglucose.

By way of example, mention may be made of the product sold under the name Glucate® DO by the company Amerchol, which is a methylglucose dioleate. Mention may also be made, by way of examples, of esters or mixtures of esters of fatty acid sugar: the products sold under the names F160, F140, F110, F90, F70 and SL40 by the company Crodesta, respectively denoting sucrose palmitostearates of 73% monoester and 27% di- and tri-ester, 61% monoester and 39% di-, tri- and tetraester, 52% monoester and 48% di-, tri- and tetraester, 45% monoester and 55% di-, tri- and tetraester, 39% monoester and 61% di-, tri-, and tetraester, and sucrose mono-laurate; the products sold under the name Ryoto Sugar Esters, for example referenced B370 and corresponding to sucrose behenate formed from 20% monoester and 80% di-triester-polyester; the sucrose mono-dipalmito-stearate marketed by Goldschmidt under the name Tegosoft® PSE. As regards the cyclic ethers and cyclic esters, γ-butyrolactone, dimethyl isosorbide or diisopropyl isosorbide are particularly suitable. Silicone oils can also be used as an inert organic liquid phase. More particularly, the suitable silicone oils are liquid and non-volatile silicone fluids with a viscosity of less than or equal to 10,000 mPa.s at 25 ° C., the viscosity of the silicones being measured according to ASTM Standard 445 Appendix C. The oils of Silicone are further defined in Walter Noll's "Chemistry and Technology of Silicones" (1968) - Academic Press. Among the silicone oils that may be used according to the invention, mention may be made in particular of the silicone oils sold under the names DC-200 fluid-5 mPas, DC-200 fluid-20 mPas, DC-200 fluid-350 mPa. .s, DC-200 fluid-1000 mPa.s, DC-200 fluid-10,000 mPa.s by the company Dow Corning. The mineral oils can also be used as organic inert liquid phase, for example paraffin oil.

Vegetable oils may also be suitable, including avocado oil, olive oil or liquid jojoba wax. Preferably, the organic inert liquid phase is chosen from the group formed by the polydecenes of formula Ci on1-1 [(20n) +2] in which n varies from 3 to 9 and preferably from 3 to 7, the esters of fatty alcohols or fatty acids, and mixtures thereof. According to a particular embodiment of the invention, the content of organic inert phase, preferably liquid, varies from 0.1 to 30% by weight, preferably from 0.5 to 20% by weight relative to the weight of the composition according to the invention, and even more preferably from 1 to 10% by weight. According to one embodiment, the composition in compressed form according to the invention comprises at least one hydrogen peroxide generating agent. As a hydrogen peroxide generating agent useful in the present invention, mention may be made of polymeric complexes that can release hydrogen peroxide, such as polyvinylpyrrolidone / H 2 O 2, in particular being in the form of powders and the other polymer complexes described. in US 5,008,093; US 3,376,110; US 5,183,901. Mention may also be made of urea peroxide, perborates and percarbonates of alkali or alkaline earth metals or of ammonium. Alkaline or alkaline earth metal percarbonates, in particular sodium perabonate, are preferably used. It may be noted that the persulfates of alkali or alkaline earth metals or of ammonium are not included in these precursors because in the redox mechanisms employing these persulfates there is no release of hydrogen peroxide. In this embodiment, the hydrogen peroxide-generating agent (s) may represent from 0.1 to 40% by weight relative to the total weight of the composition, preferably from 0.5 to 20% by weight and better still from 1 to 10% by weight. The bleaching composition according to the invention is in compressed form is preferably anhydrous.

In the context of the present invention, a composition is anhydrous when it has a water content of less than 1% by weight, and preferably less than 0.5% by weight relative to the total weight of the composition. Preferably the composition according to the invention is free of water.

The composition according to the present invention may also comprise various additives conventionally used in cosmetics. The composition according to the present invention may thus comprise lubricants such as polyol stearates or stearates of alkali or alkaline earth metals, pigments, dyes, additives such as urea, ammonium chloride, antioxidants, penetrating agents, sequestering agents such as EDTA or EDDS, buffers, dispersing agents, film-forming agents, preserving agents, opacifying agents, vitamins, perfumes, anionic polymers, not ionic, amphoteric or zwitterionic other than the rheology modifying agents already mentioned, conditioning agents such as for example cationic polymers, ceramides, amino silicones. Of course, one skilled in the art will take care to choose this or these optional additional compounds in such a way that the advantageous properties intrinsically attached to the composition according to the invention are not, or not substantially, impaired by the addition or additions considered. The composition in compressed form can be obtained according to methods of compression, compaction (or pelleting) known as for example direct compression. The composition may in particular be provided in the form of a powder which is compacted, for example in a pelletizer, by application of a compressive force. The value of the compressive force can range, for example, from 0.1 to 500 MPa, in particular from 0.2 to 100 MPa.

The composition in compressed form according to the invention may be single-layer or mutilayer. According to one embodiment, it may comprise at least one layer comprising the bleaching composition comprising at least one persulfate and at least one so-called additional layer which may comprise, for example, bursting agents intended to accelerate the disintegration of the tablet, alkaline agents as mentioned above, cosmetic active agents and mixtures thereof. As bursting agents mention may in particular be made of celluloses and cellulose derivatives, in particular hydroxyalkylcelluloses, amphiphilic polyurethanes, crosslinked polyacrylates, crosslinked polyvinylpyrrolidone, gums such as guar gum, soy polysaccharides and alginates. , aluminum silicates and their derivatives, silicas, in particular hydrophilic silicas and mixtures thereof According to one embodiment, the composition in compressed form comprises at least one layer comprising the bleaching composition comprising at least one persulfate, at least one additional layer comprising at least one bursting agent (or disintegration agent) intended to accelerate the disintegration of the tablet and at least one additional layer comprising at least one alkaline agent.

According to one embodiment, the composition in compressed form comprising at least one persulfate comprises at least one inclusion, for example in the form of a ball, comprising a powder or a liquid encapsulated in a water-soluble film.

The composition in compressed form according to the invention may be in unidose form ready for use. According to one embodiment, it can be divisible and comprise on at least one of its faces at least one breakpoint bar indicating a division of the tablet into two parts (for example two halves) or several parts, to allow a dosage the amount of bleaching composition to be used in the process. The composition in compressed form according to the invention can be packaged in individual form or grouped in a hermetic bag, moisture-proof.

The present invention also relates to a process for bleaching keratinous fibers comprising applying to the keratinous fibers a bleaching composition in compressed form comprising at least one persulfate and at least one amphoteric polymer in the presence of an aqueous composition.

The composition in compressed form is generally added to the aqueous composition just at the moment of use, that is to say just before application to the keratinous fibers. The step of dissolving the bleaching composition in compressed form can take from a few seconds to a few minutes, it can be done with or without agitation.

The present invention also relates to a multi-compartment device comprising: at least one bleaching composition in compressed form comprising at least one persulfate and at least one amphoteric polymer and at least one aqueous composition, said compositions being packaged separately.

The appropriate medium of the aqueous composition is generally water or a mixture of water and at least one organic solvent to solubilize compounds that are not sufficiently soluble in water. As organic solvent, there may be mentioned, for example, lower alkanols in 0104, such as ethanol and isopropanol; polyols such as propylene glycol, glycerol, dipropylene glycol and polyol ethers such as 2-butoxyethanol, propylene glycol monomethyl ether, and aromatic alcohols such as benzyl alcohol or phenoxyethanol, the like and mixtures thereof. The solvents may be present in proportions preferably of between 1 and 40% by weight relative to the total weight of the aqueous composition, and more preferably between 5 and 30% by weight approximately. According to one embodiment, the aqueous composition comprises at least one oxidizing agent.

The oxidizing agents that can be used in the aqueous composition are preferably chosen from hydrogen peroxide and compounds that release hydrogen peroxide by hydrolysis, such as urea peroxide. Hydrogen peroxide is preferably used. The oxidizing agent may represent from 0.5 to 70% by weight, preferably from 1 to 60% by weight, and better still from 5 to 20% of the total weight of the aqueous composition. The aqueous composition comprising at least one oxidizing agent preferably has a pH of less than 7.

The aqueous composition may be in any form suitable to allow good dilution of the composition in compressed form, preferably in liquid form. The composition may also contain various additives conventionally used in cosmetics such as those described above. It may further include oxygen release control agents such as carbonate or magnesium oxide. The additives and oxygen release control agents as defined above may be present in an amount for each of them ranging from 0.01 to 40% by weight, preferably from 0.1 to 30% by weight relative to to the total weight of the aqueous composition. The invention will be more fully illustrated with the aid of the following nonlimiting examples. Unless otherwise indicated, the quantities indicated are expressed in grams. EXAMPLE The following powder-form bleaching composition can be prepared: Potassium persulfate (United Initiators KPS) 48.4 Ammonium persulfate (United Initiators APS) 14.5 Sodium metasilicate (Woellner Simet AP) 14, 5 Ethylenediamine Tetraacetic Acid 1 Sodium Lauryl Sulfate (Texapon Z95P from Cognis) 1 Hydroxypropyl Guar Gum (Rhodia Jaguar HP 105) 2 Microcrystalline Cellulose (Avicel PH 105 from FMC Corp) 16.6 Acrylic Acid Copolymer / Acrylamidopropyltrimethylchloride ammonium (Estesol LF Stockhausen) 2 Tablets of 10 grams each can be prepared from the powder obtained using a SPECAC compacting machine. The tablet composition thus obtained can be mixed with an aqueous 20, 30 or 40 volumes (oxidizing) aqueous hydrogen peroxide composition in a ratio of 1: 1.5 to 1/2, ie 4 tablets (40g) for 60 to 80g of oxidant.

Claims (15)

REVENDICATIONS1. A bleaching composition for keratin fibers in the compressed form comprising at least one persulfate and at least one amphoteric polymer. 2. The composition of claim 1, wherein the persulfate (s) are selected from persulfates of sodium, potassium and ammonium, and mixtures thereof. 3. Composition according to claim 1 or 2, characterized in that the persulfate concentration is between 10 and 80% by weight, preferably between 20 and 70% by weight and better still between 40 and 65% by weight of the total weight of the composition. 4. Composition according to one of the preceding claims, characterized in that the amphoteric polymer or polymers are chosen from the following compounds (1) the polymers comprising as monomers at least one monomer derived from a vinyl compound carrying a grouping carboxylic acid, preferably acrylic acid, methacrylic acid, maleic acid, alpha-chloroacrylic acid, and at least one basic monomer derived from a substituted vinyl compound containing at least one basic atom chosen from: a) the dialkyl aminoalkyl methacrylates, dialkyl aminoalkyl acrylates, dialkyl aminoalkyl methacrylamide and dialkyl aminoalkyl acrylamide. b) trialkylaminoalkyl methacrylate and trialkylaminoalkyl acrylate salts, trialkylaminoalkylmethacrylamide and trialkylaminoalkylacrylamide salts, (2) polymers having units derived from: a) at least one monomer selected from acrylamides or methacrylamides substituted on the nitrogen with an alkyl radical preferably containing from 2 to 12 carbon atoms, 15b) of at least one acidic comonomer containing one or more reactive carboxylic groups, preferably chosen from acrylic, methacrylic, crotonic and itaconic acids, maleic, fumarious as well as among alkyl monoesters having 1 to 4 carbon atoms of maleic or fumaric acids or anhydrides, c) at least one basic comonomer such as esters with primary, secondary, tertiary and quaternary amino substituents of the acids acrylic and methacrylic acid and the quaternization product of dimethylaminoethyl methacrylate with di methyl or diethyl; (3) copolymers comprising, as monomers, at least one monomer derived from a vinyl compound bearing a carboxylic group such as, more particularly, acrylic acid, methacrylic acid, maleic acid, alpha-chloro acrylic acid, and at least one diallyl dialkyl ammonium salt monomer, the alkyl groups having 1 to 6 carbon atoms; (4) polyamino amides crosslinked and alkyl partially or completely derived from poyaminoamides of general formula: - [- CO - R10 - CO - ZI (I) wherein R10 represents a divalent radical derived from a saturated dicarboxylic acid, a aliphatic mono or dicarboxylic acid with ethylenic double bond, an ester of a lower alkanol having 1 to 6 carbon atoms of these acids or a radical derived from the addition of any of said acids with a bis amine primary or secondary bis, and Z denotes a radical of a mono- or bis-secondary bis-primary polyalkylene polyamine and preferably represents: a) in the proportions of 60 to 100 mol%, the radical N (CH 2) x HH p where x = 2 and p = 2 or 3, or x = 3 and p = 2 this radical derived from diethylene triamine, triethylene tetraamine or dipropylene triamine, b) from 0 to 40 mole% the radical (II) above, in which x = 2 and p = 1 and which derives from ethyl nediamine, or the radical deriving from piperazine: ## STR1 ## in the proportions of from 0 to 20 mole%, the radical -NH- (CH 2) 6 -NH- derived from hexamethylenediamine, these polyaminoamines being crosslinked; by addition of a bifunctional crosslinking agent chosen from epihalohydrins, diepoxides, dianhydrides, bis unsaturated derivatives, by means of 0.025 to 0.35 moles of crosslinking agent per amine group of polyaminoamide and alkyls by the action of acrylic acid , of chloroacetic acid or of an alkane sultone or of their salts, (5) polymers having zwitterionic units of the formula: R12 R14 O (III) [1 I + (CH2) z- to R11 CYNII R15 R13 in which R 11 denotes a polymerizable unsaturated group such as an acrylate, methacrylate, acrylamide or methacrylamide group, y and z represents an integer of 1 to 3, R 12 and R 13 represent a hydrogen, methyl, ethyl or propyl atom, R 14 and R15 represent an atom of hy or a radical alkyl such that the sum of the carbon atoms in R14 and R15 does not exceed 10, (6) polymers derived from chitosan having monomer units corresponding to the following formulas: CH2OH H 0 0 (D) / H Embedded image wherein the unit D is present in proportions of between 0 and 30%, and the unit E in proportions of from 0 to 30%; between 5 and 50% and the unit F in proportions of between 30 and 90%, it being understood that in this unit F, R 16 represents a radical of formula: ## STR2 ## wherein if q = 0, R17, R18 and R19, which are identical or different, each represent a hydrogen atom, a methyl, hydroxyl, acetoxy or amino residue, a monoalkylamine residue or a dialkylamine residue optionally interrupted by one or more nitrogen atoms and / or optionally substituted by one or more amine, hydroxyl, carboxyl, acoylthio, sulfo groups n, an alkylthio radical whose alkyl group carries an amino residue, at least one of the radicals R17, R18 and R19 being in this case a hydrogen atom; or if q = 1, R 17, R 18 and R 19 each represent a hydrogen atom, as well as the salts formed by these compounds with bases or acids; (7) polymers derived from the N-carboxyalkylation of chitosan; (8) polymers having units corresponding to the general formula (IV) :( IV) R 20 (CH 2 CH 2) COOH CO N -R 2 R 24 N -R 23 R 22 in which R 20 represents a hydrogen atom, a CH 3 group, CH3CH2O, phenyl, R21 denotes hydrogen or a lower alkyl radical such as methyl, ethyl, R22 denotes hydrogen or a lower alkyl radical such as methyl, ethyl, R23 denotes a lower alkyl radical such as methyl, ethyl or a radical; having the formula: -R24-N (R22) 2, R24 representing a group -CH2-CH2-, -CH2-CH2-CH2-, -CH2-CH (CH3) -, R22 having the meanings mentioned above, as well as the higher homologues of these radicals and containing up to 6 carbon atoms; (9) amphoteric polymers of the -DXDX type chosen from: a) the polymers obtained by the action of chloroacetic acid or sodium chloroacetate on compounds comprising at least one unit of formula: -DXDXD- (V) where D denotes a radical -NN 1 and X denotes the symbol E or E ', E or E', which may be identical or different, denote a divalent radical which is a straight or branched chain alkylene radical containing up to 7 carbon atoms in the unsubstituted main chain or substituted with hydroxyl groups and may further comprise oxygen, nitrogen, sulfur, 1-3 aromatic and / or heterocyclic rings; the oxygen, nitrogen and sulfur atoms being present in the form of ether, thioether, sulfoxide, sulfone, sulfonium, alkylamine, alkenylamine, hydroxyl groups, benzylamine, amine oxide, quaternary ammonium, amide, imide groups, alcohol, ester and / or urethane, b) polymers of formula: -DXDX- (VI) where D denotes a radical -NN \ and X denotes the symbol E or E 'and at least once E'; E having the meaning indicated above and E 'is a divalent radical which is a straight or branched chain alkylene radical having up to 7 carbon atoms in the main chain, substituted or unsubstituted by one or more hydroxyl radicals and having a or a plurality of nitrogen atoms, the nitrogen atom being substituted by an optionally interrupted alkyl chain by an oxygen atom and necessarily comprising one or more carboxyl function or one or more hydroxyl functions and betaineized by reaction with chloroacetic acid or sodium chloroacetate, (10) (C1-C5) alkyl vinyl ether / maleic anhydride copolymers partially modified by semiamidation with N, N-dialkylaminoalkylamine or by semi-esterification with N, N-dialkanolamine; and their mixtures. 5. Composition according to any one of the preceding claims, characterized in that the amphoteric polymer (s) is (are) chosen from acrylic acid / acrylamidopropyltrimethylammonium chloride copolymers; acrylic acid / acrylamidopropyltrimethylammonium chloride / acrylamide copolymers; copolymers comprising as monomers dimethyldiallylammonium chloride and acrylic acid optionally combined with acrylamide, and mixtures thereof. 6. Composition according to any one of the preceding claims, characterized in that the amphoteric polymer (s) is (are) chosen from acrylic acid / acrylamidopropyltrimethylammonium chloride copolymers. 7. Composition according to any one of the preceding claims, characterized in that the amphoteric polymer or polymers represent from 0.01 to 10% by weight, preferably from 0.05 to 7% and even more preferentially from 0.1 to 5% by weight. relative to the total weight of the composition. 8. Composition according to any one of the preceding claims, characterized in that it comprises at least one alkaline agent chosen from water-soluble silicates such as alkali metal or alkaline-earth metal silicates, alkali metal basic or tribasic phosphate di-phosphates. or alkaline-earth metals or alkali or alkaline-earth metal carbonates, and mixtures thereof. 9. Composition according to the preceding claim, characterized in that the alkaline agent (s) are present in an amount ranging from 0.1 to 40%, preferably from 0.5 to 30% by weight and better still from 1 to 20% by weight. weight of the total weight of the composition. 10. Composition according to any one of the preceding claims, characterized in that it comprises at least one rheology modifier selected from hydrophilic thickeners, amphiphilic polymers comprising at least one hydrophobic chain, distinct from the amphiphilic polymer, the fillers. and their mixtures. 11. Composition according to any one of the preceding claims, characterized in that it comprises at least one disintegrant chosen from celluloses and cellulose derivatives, crosslinked polyacrylates, crosslinked polyvinylpyrrolidone, soy polysaccharides, alginates, aluminum silicates and their derivatives, hydrophilic silicas and mixtures thereof. 12. Composition according to any one of the preceding claims, characterized in that it comprises an organic inert phase, preferably liquid, preferably selected from the group consisting of polydecenes of formula Ci onH [(20n) + 2] in which n varies from 3 to 9 and preferably from 3 to 7, the esters of fatty alcohols or fatty acids, and mixtures thereof. 13. Composition according to any one of the preceding claims, characterized in that it comprises at least one surfactant, preferably anionic or nonionic. 14. A process for bleaching keratinous fibers comprising applying to the keratinous fibers a composition according to one of claims 1 to 13, in the presence of an aqueous composition. 15. The method of claim 14, characterized in that the aqueous composition comprises an oxidizing agent, preferably hydrogen peroxide.