composition for cleaning and / or caring for keratinous material

Abstract

composition for cleaning and / or caring for keratinous material The present invention relates to a composition, preferably for cleaning and / or caring for keratinous material, comprising: a) at least one alpha-hydroxy acid; and b) at least one selenium sulfide; wherein the selenium sulfide forms aggregations in the composition, and the aggregations have an average size of 65 μm or less.

Description

Title of the invention: Keratinous material cleaning and / or care composition. Technical field

[0001] The present invention relates to a composition for cleaning and / or conditioning keratinous material, preferably hair and scalp. The present invention also relates to a process for cleaning and / or conditioning keratinous material, preferably hair and scalp. STATE OF THE ART

[0002] The scalp is an epidermis that undergoes continuous renewal, like the rest of the skin tissue, and is rich in sebaceous glands. Normally, the scalp is renewed by an imperceptible and invisible shedding of superficial skin cells. However, excessive renewal of the cells in the stratum corneum of the scalp, for various reasons, can lead to the formation of large, thick patches of cells visible to the naked eye, known as "dandruff".

[0003] Dandruff is a chronic, frequent, and recurring condition that is socially debilitating due to its clearly unsightly appearance. These dandruff-related scalp conditions result from an alteration of the epidermis' barrier function. Furthermore, these conditions can cause sensations of itching or pruritus, leading to scratching behavior that exacerbates the appearance of dandruff.

[0004] Many cosmetic cleansing and / or skincare products for keratinous materials have been developed to include at least one anti-dandruff agent, for example, selenium sulfide, to address the above-mentioned problems. However, it is often difficult for cosmetic products containing selenium sulfide to provide satisfactory revitalizing effects to customers, for example, a smooth texture. Furthermore, customers also require the desired anti-dandruff efficacy.

[0005] Therefore, there is a need for a cleansing and / or conditioning composition for keratinous material, which includes selenium sulfide, and can provide an improved smooth texture sensation of keratinous material, and optionally a desired anti-dandruff efficacy. Summary of the invention

[0006] The inventors have discovered that such a need can be satisfied by the composition according to the present invention.

[0007] According to a first aspect, the present invention proposes a composition, preferably for cleaning and / or caring for keratinous material, comprising: a. at least one alpha-hydroxy acid; and b. at least one selenium sulfide;

[0008] wherein selenium sulfide forms aggregations in the composition, and the aggregations have an average size of 65 qm or less.

[0009] According to a second aspect, the present invention proposes a process for cleaning and / or caring for keratinous material, preferably hair and scalp, comprising the following steps: a. the application of the composition as described above to a moist keratinous material, b. massaging the keratinous material for 2 seconds to 120 seconds, and c. rinsing the keratinous material with water.

[0010] According to a third aspect, the present invention proposes a process for preparing the composition as described above, comprising an alpha-hydroxy acid, a selenium sulfide and at least one additional component, wherein the process includes a step of premixing the alpha-hydroxy acid with the selenium sulfide at a weight ratio from 0.5 to 1000, before or after the addition of said additional component.

[0011] Thanks to the selenium sulfide aggregates such as are formed having the specific size, after application of the composition to the keratinous material, preferably to the hair and scalp, the composition can provide a feeling of improved smooth texture of the keratinous material.

[0012] Thanks to the premixing step of the alpha-hydroxy acid with selenium sulfide at a weight ratio of 0.5 to 1000, the selenium sulfide can be better dispersed in the composition.

[0013] In addition, the composition according to the present invention can also provide a desirable anti-dandruff efficacy.

[0014] Other subjects and features, aspects and advantages of the present invention will become even clearer upon reading the detailed description and examples that follow. DETAILED DESCRIPTION OF THE INVENTION

[0015] In what follows and unless otherwise indicated, the limits of a range of values ​​are included in that range, in particular in the expressions "between...and..." and "from...to...".

[0016] The articles "a" and "an", as used herein, mean one or more when applied to any particularity in embodiments of the present invention as described in the specification and the claims. The use of "a" and "an" does not limit the meaning to a single feature unless such a limitation is specifically stated. Furthermore, the expression "at least one" used in this description is equivalent to the expression "one or more".

[0017] Throughout this application, the term "comprising" shall be interpreted as encompassing all the specifically mentioned features as well as optional, additional, unspecified features. As used herein, the use of the term "comprising" also discloses the embodiment in which no material features or even any features other than the specifically mentioned features are present (such as "essentially consisting of" or "consisting of"). In the case of "essentially consisting of," any additional composition, material, and / or component that materially affects the fundamental and new features is excluded from such an embodiment, but any composition, material, and / or component that does not materially affect the fundamental and new features may be included in the embodiment.

[0018] Unless otherwise specified, all numerical values ​​expressing a quantity of ingredients and other substances used in the description and claims shall be understood as being modified by the term "approximately". Accordingly, unless otherwise indicated, the numerical values ​​and parameters described herein are approximate values ​​that may be modified according to the desired performance obtained as required. The term "approximately" referring to a certain value is intended to denote a range to within ±5% of the value, for example: within ±3%, ±2%, ±1%, and ±0.5% of the value.

[0019] As used herein, the expression "keratinous material(s)" means at least one material chosen from among hair, eyelashes, eyebrows, skin, nails, mucous membranes and scalp, and preferably hair and scalp.

[0020] For the purposes of the present invention, and unless otherwise indicated:

[0021] - an "alkyl" radical means a linear or branched saturated radical containing, by for example, from 1 to 30 carbon atoms.

[0022] - an "alkenyl" radical designates a hydrocarbon group formed when an atom hydrogen is removed from an alkene group.

[0023] - an "alkoxy" radical designates an alkyl group attached to the parent molecule by an atom of oxygen (i.e., "-O-alkyl"), where "alkyl" is as defined above.

[0024] - a "heterocyclyl" radical designates a monovalent group derived from a chosen ring among monocyclic, bicyclic or polycyclic cycles of 3 to 8 links, preferably of 4 to 6 links, saturated, partially unsaturated or totally unsaturated comprising at least one carbon atom in addition to 1, 2, 3 or 4 heteroatoms chosen from oxygen, sulfur and nitrogen.

[0025] - an "aryl" radical designates a monovalent hydrocarbon radical derived from a system of monocyclic, fused bicyclic or polycyclic rings (in which at least one nucleus contains a fully conjugated ir electron system) with known aromatic characteristics. Alpha-hydroxy acid

[0026] The composition according to the present invention comprises at least one alpha-hydroxy acid.

[0027] The expression "alpha-hydroxy acid" means, according to the present invention, a carboxylic acid having at least one hydroxyl functional group occupying an alpha position on said acid (carbon adjacent to a carboxylic acid functional group).

[0028] The alpha-hydroxy acid present in the composition according to the present invention includes, but is not limited to, glycolic acid, citric acid, lactic acid, methyllactic acid, glucuronic acid, 2-hydroxybutanoic acid, 2-hydroxypentanoic acid, 2-hydroxyhexanoic acid, 2-hydroxyheptanoic acid, 2-hydroxyoctanoic acid, 2-hydroxynonanoic acid, 2-hydroxydecanoic acid, 2-hydroxyundecanoic acid, 2-hydroxydodecanoic acid, 2-hydroxytetradecanoic acid, 2-hydroxyhexadecanoic acid, 2-hydroxyoctadecanoic acid, 2-hydroxytetracosanoic acid, 2-hydroxyeicosanoic acid, mandelic acid, acid phenyllactic acid, gluconic acid, galacturonic acid, ribosomal acid, tartronic acid, tartaric acid, malic acid, fumaric acid, and mixtures thereof.

[0029] Preferably, the alpha-hydroxy acid is a lower acid having 2 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, even more preferably 2 to 6 carbon atoms.

[0030] Suitable alpha-hydroxy acids include glycolic acid, lactic acid, tartaric acid, citric acid, gluconic acid, and their combinations.

[0031] Preferably, the alpha-hydroxy acid is a monocarboxylic acid.

[0032] More preferably, the alpha-hydroxy acid is a lower monocarboxylic acid having 2 to 8 carbon atoms, even more preferably 2 to 6 carbon atoms such as lactic acid.

[0033] The most preferable alpha-hydroxy acid is lactic acid, for example, that sold under the trade name L-LACTIC ACID (90%) (CRG) by the company MUSASHINO CHEMICAL LABORATORY, and that sold under the trade name L(4)-LACTIC ACID 90% HEAT STABLE PERSONAL CARE by the company JUNGBUNZLAUER.

[0034] Advantageously, the alpha-hydroxy acid is in an amount ranging from 0.01% by weight to 30% by weight, preferably from 0.05% by weight to 20% by weight, more preferably from 0.1% by weight to 10% by weight, even more preferably from 0.5% by weight to 8% by weight, and most preferably from 1% by weight to 6% by weight, relative to the total weight of the composition. Selenium sulfide

[0035] The composition according to the present invention comprises at least one selenium sulfide (or selenium disulfide).

[0036] Selenium sulfide is a basic commercial product. Selenium sulfide is generally considered to be a compound containing one mole of selenium and two moles of sulfur. However, it can take the form of a cyclic structure, SexSy, in which x + y = 8. Since sulfur and selenium readily form rings and chains, selenium sulfide is not a pure chemical compound, but a mixture, for example, a mixture of eight-membered cyclic compounds where the overall Se:S ratio is 1:2 (often abbreviated as SeS2).

[0037] Selenium sulfide is used to treat dandruff and certain scalp infections (seborrheic dermatitis). It reduces itching, irritation, and redness of the scalp.

[0038] According to the present invention, selenium sulfide is added as a raw material in powder form, the particles of which generally have a particle size (D90) of less than 25 µm, preferably less than 20 µm, more preferably less than 15 µm, and even more preferably less than 10 µm. For example, selenium sulfide, as a raw material, can have a particle size (D90) ranging from 1 µm to 24 µm, preferably from 3 µm to 15 µm, and more preferably from 5 µm to 10 µm, for example, 24 µm, 20 µm, 18 µm, 15 µm, 10 µm, 8 µm, 7 µm, 5 µm, 3 µm, 2 µm or 1 µm. For the purposes of this invention, the particle size (D90) corresponds to the particle size defined such that 90% by volume of the particles are smaller than the particle size (D90). The particle size is, for example, measured by a forward laser light scattering device (e.g., a Malvern 3600 instrument).

[0039] A particularly preferable example of selenium sulfide is that sold under the trade name SELENIUM SULPHIDE EP / USP MICRONIZED by the company ESKAY FINE CHEMICALS.

[0040] Advantageously, selenium sulfide is present in an amount ranging from 0.001% by weight to 10% by weight, preferably from 0.005% by weight to 5% by weight, more preferably from 0.01% by weight to 3% by weight, and even more preferably from 0.1% by weight to 2% by weight, relative to the total weight of the composition. Fatty amine

[0041] According to the present invention, the composition may comprise at least one fatty amine as a revitalizing agent. Two or more fatty amines may be used in combination. Thus, a single type of fatty amine or a combination of different types of fatty amines may be used.

[0042] The term "fatty amines" refers to primary, secondary, or tertiary fatty amines, which are optionally (poly)oxyalkylated, or their salts. Fatty amines generally comprise at least one C6-C3 hydrocarbon chain. Preferably, the fatty amines according to the present invention are not quantified. Preferably, the fatty amines according to the present invention are not (poly)oxyalkylated.

[0043] Preferably, the composition according to the present invention comprises at least one fatty amine comprising at least one C6-C30 hydrocarbon-based chain.

[0044] Preferably, the composition according to the present invention comprises at least one fatty amine selected from among the tertiary fatty amines.

[0045] More preferably, the composition according to the present invention comprises one or more tertiary fatty amines selected from among the amidoamines.

[0046] Amidoamines are a class of chemical compounds formed from fatty acids and diamines. Non-limiting examples of amidoamines include those with the following formula (I):

[0047] RCONHR'N(R")2(I)

[0048] wherein R represents a hydrocarbon radical containing at least 6 carbon atoms, preferably from 6 to 30 carbon atoms, preferably from 8 to 24 carbon atoms, and in particular a C6-C30 hydrocarbon radical, preferably C8-C24, linear or branched, saturated or unsaturated and substituted or unsubstituted, preferably a C6-C30 alkyl radical, preferably C8-C24, linear or branched, or a C6-C30 alkenyl radical, preferably C8-C24, linear or branched; and R' represents a divalent hydrocarbon radical containing less than 6 carbon atoms, preferably from 1 to 4 carbon atoms, which may be linear or branched, saturated or unsaturated, and substituted or unsubstituted; and R" which may be identical or different, represents a hydrogen or hydrocarbon radical containing less than 6 carbon atoms, preferably 1 to 4 carbon atoms.Furthermore, R" can be linear or branched, acyclic or cyclic, saturated or unsaturated, substituted or unsubstituted. Preferably, R" is a linear or branched acyclic alkyl or alkenyl group. More preferably, R" is a hydrogen or methyl group.

[0049] Non-limiting examples of amidoamines include, but are not limited to, oleamidopropyl dimethylamine, stearamidopropyl dimethylamine, isostearamidopropyl dimethylamine, stearamidoethyl dimethylamine, lauramidopropyl dimethylamine, myristamidopropyl dimethylamine, behenamidopropyl dimethylamine, dilinoleamidopropyl dimethylamine, palmitamidopropyl dimethylamine, ricinoleamidopropyl dimethylamine, sojamidopropyl dimethylamine, bleamidopropyl dimethylamine germ, toumesolamidopropyl dimethylamine, amandamidopropyl dimethylamine, avocadoamidopropyl dimethylamine, babassuamidopropyl dimethylamine, cocamidopropyl dimethylamine, visonamidopropyl dimethylamine, avoinamidopropyl dimethylamine, sesamidopropyl dimethylamine, palmitamidopropyl dimethylamine, brassicamidopropyl dimethylamine, olivamidopropyl dimethylamine, stearamidoethyl diethylamine, stearamidopropyl diethylamine, palmitamidopropyl diethylamine,Palmitamidoethyl diethylamine, palmitamidoethyl dimethylamine, behenamidopropyl diethylamine, behenamidoethyl diethylamine, behenamidoethyl dimethylamine, arachidamidopropyl dimethylamine, arachidamidoethyl diethylamine, arachidamidoethyl dimethylamine, diethylaminoethylstearamide, and mixtures thereof. Preferably, the fatty amine is brassicamidopropyl dimethylamine.

[0050] Other suitable fatty amines include, but are not limited to, octylamine, decylamine, dodecylamine, stearylamine, stearyldimethylamine, and mixtures thereof.

[0051] A particularly preferable example of brassicamidopropyl dimethylamine is that sold under the trade name PROCONDITION 2 by INOLEX CHEMICAL COMPANY.

[0052] Advantageously, the fatty amine is present in an amount ranging from 0.01% by weight to 10% by weight, preferably from 0.01% by weight to 3% by weight, more preferably from 0.05% by weight to 2% by weight, and even more preferably from 0.1% by weight to 1% by weight, relative to the total weight of the composition. Beta-hydroxy acid and / or its derivatives

[0053] According to the present invention, the composition may comprise at least one beta-hydroxy acid and / or its derivatives.

[0054] The term “beta-hydroxy acid” means, according to the present invention, a carboxylic acid having a hydroxyl functional group and a carboxylic functional group separated by two carbon atoms.

[0055] Preferably, the "derived" in the expression "beta-hydroxy acid and / or its derivatives" means that the hydroxyl functional group of the beta-hydroxy acid, rather than the carboxylic functional group, is derived and preferably acylated.

[0056] Preferably, the beta-hydroxy acid and / or its derivatives are chosen from salicylic acid, its derivatives acylated on the hydroxyl group, and its derivative of the following formula (II):

[0057] wherein, R represents a linear, branched or cyclic saturated aliphatic group or an unsaturated aliphatic group containing one or a number of double bonds, which may or may not be conjugated, these groups containing from 2 to 22, preferably from 3 to 11 carbon atoms and being optionally substituted by at least one substituent selected from (a) halogen atoms, (b) the trifluoromethyl group, (c) hydroxyl groups in free form or esterified by an acid having from 1 to 6 carbon atoms or (d) a carboxyl functional group which is free or esterified by a lower alcohol having from 1 to 6 carbon atoms;

[0058] R' represents a hydroxyl group or an ester functional group of the following formula (III): ---O--C — R, (III) II O

[0059] wherein Ri is a saturated or unsaturated, linear or branched aliphatic group having from 1 to 18 carbon atoms, preferably from 4 to 15 carbon atoms.

[0060] More preferably, the beta-hydroxy acid and / or its derivatives are those having a salicylic fraction, including salicylic acid, acetylsalicylic acid, capryloylsalicylic acid, 5-n-decanoylsalicylic acid, 5-n-dodecanoylsalicylic acid, 5-propanoylsalicylic acid, 5-n-hexadecanoylsalicylic acid, 5-n-oleoylsalicylic acid, and mixtures thereof.

[0061] Non-limiting examples of other useful beta-hydroxy acids and / or their derivatives include 5-n-octylsalicylic acid, 5-n-heptyloxysalicylic acid, 4-n-heptyloxysalicylic acid, 5-tert-octylsalicylic acid, 3-tert-butyl-5-methylsalicylic acid, 3-tert-butyl-6-methylsalicylic acid, 3,5-diisopropylsalicylic acid, 5-butoxysalicylic acid, 5-octyloxysalicylic acid, 5-benzoylsalicylic acid, beta-hydroxypropionic acid, beta- hydroxybutyric acid, beta-hydroxybutyric acid, beta-methylbutyric acid, camitine, lipohydroxy acid, 3-hydroxyvaleric acid, and mixtures thereof.

[0062] According to the present invention, the beta-hydroxy acid and / or its derivatives are preferably particularly chosen from salicylic acid, acetylsalicylic acid, capryloyl salicylic acid, and mixtures thereof, and are more preferably from salicylic acid.

[0063] A particularly preferred beta-hydroxy acid and / or its derivatives are salicylic acid, for example, that sold under the trade name AMIPRESERVE by the company ALBAN MULLER (CRODA), and that sold under the trade name SALICYLIC ACID USP by the company CELLMARK.

[0064] Advantageously, the beta-hydroxy acid and / or its derivatives are present in an amount ranging from 0.05% by weight to 10% by weight, preferably from 0.1% by weight to 8% by weight, and more preferably from 0.5% by weight to 6% by weight, relative to the total weight of the composition. Anionic surfactant

[0065] According to the present invention, the composition may include at least one anionic surfactant.

[0066] In the present description, a species is said to be "anionic" when it carries at least one permanent negative charge or when it can be ionized into a negatively charged species, under the conditions of use of the composition of the invention (for example, the medium or the pH).

[0067] Preferably, the anionic surfactant is chosen from among the alkyl ethers sulfates.

[0068] In some cases, alkyl ether sulfates include those corresponding to the following formula (IV): (IV)

[0069] in which, R represents a hydrogen or an alkyl chain having 6 to 24 carbon atoms, preferably an alkyl chain having 8 to 18 carbon atoms, and more preferably an alkyl chain having 12 to 18 carbon atoms, said alkyl chain being saturated or unsaturated, linear or branched, substituted or unsubstituted;

[0070] M represents a solubilizing cation such as alkali metal ions, for example sodium or potassium ions, ammonium or substituted ammonium, or alkanolammonium ions, for example monoethanolammonium or triethanolammonium ions; and

[0071] n is an integer from 0 to 3, preferably between 1 and 3, more preferably between 2 and 3.

[0072] Preferably, the anionic surfactant is sodium laureth sulfate, for example, that sold under the trade name EMAL 170S by the company KAO, or under the trade name KOPACOL N701 S RENU ULTRA / MB MASPHATE ES70 IM LD RSPO MB by the company KENSING PT MUSIM MAS.

[0073] Advantageously, the anionic surfactant is present in an amount ranging from 1% by weight to 30% by weight, preferably from 5% by weight to 25% by weight, more preferably from 10% by weight to 20% by weight, relative to the total weight of the composition. Compound containing nitrogen

[0074] The composition according to the present invention may comprise at least one nitrogen-containing compound corresponding to the following formula (V)

[0075] in which Rh R2, R3, R4 and R5, independently of each other, designate a radical chosen from:

[0076] - a hydrogen atom,

[0077] - a carboxyl group, and

[0078] - a linear C1-C6 or branched C3-C6 alkyl group, saturated or unsaturated, which is optionally interrupted by one or more heteroatoms selected from O, S and N, and / or optionally substituted by one or more groups selected from amino, imino, amidino, guanidino, hydroxyl, sulphydryl, carboxyl, amido, C1-C6 perfluoroalkyl, C1-C6 alkoxy, sulfate, phosphate, aryl and heterocyclyl, and

[0079] in which Ri and R4 optionally form a nucleus which contains 5 or 6 atoms chosen from carbon and nitrogen.

[0080] Preferably, RB R2, R3, R4 and R5, independently of each other, denote a radical chosen from:

[0081] - a hydrogen atom,

[0082] - a carboxyl group, and

[0083] - a linear C1-C6 or branched C3-C6 alkyl group, saturated or unsaturated, which is optionally interrupted by one or more heteroatoms chosen from O, S and N, and / or optionally substituted by one or more groups selected from amino, imino, amidino, guanidino, hydroxyl, sulphydryl, carboxyl, amido, C1-C6 alkoxy, phenyl and heterocyclyl selected from pyrimidyl, piperidyl, morpholinyl, pyranyl, furyl, piperazinyl, pyridyl, imidazolyl and indolyl, and

[0084] in which Ri and R4 optionally form a ring which contains 5 or 6 atoms chosen from carbon or nitrogen.

[0085] According to the present invention, the nitrogen-containing compound may have a molecular weight less than 500, preferably less than 400, and more preferably less than 250.

[0086] Non-limiting examples of the nitrogen-containing compound include, but are not limited to, arginine, including L-arginine, trolamine, diethanolamine, L-alanine, L-asparagine, L-aspartate, L-cysteine, L-glutamate, L-glutamine, L-glycine, L-histidine, L-isoleucine, L-leucine, L-lysine, L-methionine, L-phenylalanine, L-proline, L-serine, L-threonine, L-tryptophan, L-tyrosine, L-valine, tris(hydroxymethyl)aminomethane, ethanolamine, diethanolamine, monoisopropanolamine, diisopropanolamine, N-dimethylaminoethanolamine, triisopropanolamine, 3-Isopropoxypropylamine, 3-methoxypropylamine (3-MPA), 3-ethoxypropylamine, 3-(2-ethylhexyloxy)-propylamine, 2-(2-aminoethoxy)ethanol (2-2AEE), 3-butoxypropylamine (3-BPA) and monoethanolamine (MEA), and mixtures thereof.

[0087] Preferably, the nitrogen-containing compound is chosen from the group consisting of L-arginine, trolamine, tris(hydroxymethyl)aminomethane, ethanolamine, diethanolamine, and mixtures thereof, more preferably L-arginine.

[0088] Preferably, the composition comprises at least 1% by weight to 10% by weight of the nitrogen-containing compound selected from the group consisting of L-arginine, trolamine, tris(hydroxymethyl)aminomethane, ethanolamine, diethanolamine, and mixtures thereof, more preferably L-arginine.

[0089] One of the particularly preferable nitrogen-containing compounds is L-arginine sold under the trade name L ARGININE by the company KYOWA HAKKO.

[0090] Advantageously, the nitrogen-containing compound is present in an amount ranging from 1% by weight to 10% by weight, preferably from 1.2% by weight to 8% by weight, more preferably from 1.5% by weight to 5% by weight, and even more preferably from 1.8% by weight to 5% by weight, relative to the total weight of the composition. Cellulose

[0091] The composition according to the present invention may comprise at least one cellulose.

[0092] As used herein, the term "cellulose" is intended to designate any polysaccharide compound having in its structure sequences of linked glucose residues held together via beta-1,4 bonds. Cellulose can be unsubstituted or substituted. Furthermore, cellulose can be anionic, cationic, amphoteric, or nonionic.

[0093] Preferably, the cellulose used according to the invention is chosen from unsubstituted celluloses, including those in microcrystalline form; cellulose esters; cellulose ethers; cellulose ester ethers; and mixtures thereof.

[0094] Cellulose esters include mineral cellulose esters (cellulose nitrates, sulfates, phosphates, etc.), organic cellulose esters (cellulose monoacetates, triacetates, amidopropionates, acetate butyrates, acetate propionates and acetate trimellitates, etc.) and mixed organic / mineral cellulose esters, such as cellulose acetate butyrate sulfates and cellulose acetate propionate sulfates.

[0095] Cellulose ethers include nonionic cellulose ethers, anionic cellulose ethers and cationic cellulose ethers.

[0096] Among the nonionic cellulose ethers, examples include (Ci-C4)alkylcelluloses, such as methylcelluloses and ethylcelluloses (e.g., Ethocel Standard 100 Premium from Dow Chemical); (poly)hydroxy(Ci-C4)alkylcelluloses, such as hydroxymethylcelluloses, hydroxyethylcelluloses (e.g., Natrosol 250 HHR supplied by Ashland) and hydroxypropylcelluloses (e.g., Klucel EF from Aqualon); mixed (poly)hydroxy(Ci-C4)alkyl(Cl-C4)alkylcelluloses, such as hydroxypropylmethylcelluloses (e.g., Methocel E4M from Dow Chemical), hydroxyethylmethylcelluloses, hydroxyethylethylcelluloses (e.g., Bermocoll 20 E 481 FQ from Akzo Nobel) and hydroxybutylmethylcelluloses.

[0097] Among anionic cellulose ethers, mention may be made of (poly)carboxy(C1-C4)alkylcelluloses and their salts. By way of example, mention may be made of carboxymethylcelluloses (for example Blanose 7M from the company Aqualon) and carboxymethylhydroxyethylcelluloses, and their sodium salts.

[0098] Among cationic cellulose ethers, cationic cellulose derivatives such as cellulose copolymers or cellulose derivatives grafted with a water-soluble quaternary ammonium monomer, and described in particular in US patent 4,131,576, such as (poly)hydroxy(Ci-C4)alkyl celluloses, for example hydroxymethyl, hydroxyethyl or hydroxypropylcelluloses grafted in particular with a salt of methacryloylethyltrimethylammonium, methacrylamidopropyltrimethylammonium or dimethyldiallylammonium, may be mentioned.

[0099] Among the cellulose ester ethers, we can mention hydroxypropyl methylcellulose phthalates and ethylcellulose sulfates.

[0100] According to the present invention, the cellulose is preferably selected from unsubstituted celluloses, cellulose esters, cellulose ethers, ester ethers of cellulose, and their mixtures, more preferentially chosen from among unsubstituted celluloses.

[0101] Advantageously, cellulose is present in an amount ranging from 0.01% by weight to 10% by weight, preferably from 0.05% by weight to 5% by weight, and more preferably from 0.1% by weight to 1% by weight, relative to the total weight of the composition. Amphoteric surfactant

[0102] The composition according to the present invention may include at least one amphoteric surfactant.

[0103] The expression "amphoteric surfactant" refers to a surfactant which simultaneously carries the anionic and cationic hydrophilic group with its structure simultaneously containing hermaphroditic ions which are capable of forming cations or anions depending on ambient conditions (such as changes in pH).

[0104] Useful amphoteric surfactants include betaines, sultaines (also called sulfobetaines), alkyl amphoathetas and alkyl amphodiacetates, alkyl amphopropionates, and mixtures thereof.

[0105] Preferably, the amphoteric surfactant is chosen from among the sultaines.

[0106] More preferably, the amphoteric surfactant is chosen from among the hydroxysultaine type surfactants.

[0107] In some cases, the hydroxysultaine type surfactant is chosen from among the (C8-C20 alkyl)amido(Ci-C6 alkyl)hydroxylsulfobetaines.

[0108] Preferably, non-limiting examples of the hydroxysultaine-type surfactant include hydroxysultaines of formula (VI): O Œ3 (VI> RC—WtCH^—CH2CHCfL^ CIL OH

[0109] in which R represents an alkyl group having 7 to 18 carbon atoms.

[0110] One of the particularly preferable hydroxysultaine-type surfactants is cocamidopropyl hydroxysultaine, for example, that sold under the trade name TC-SHD 50 RSPO MB by GUANGZHOU TINCI MATERIALS, or those available from SEPPIC or KAO CHEMICAL.

[0111] Advantageously, the amphoteric surfactant is present in an amount ranging from 0.1% by weight to 20% by weight, preferably from 0.5% by weight to 15% by weight, and more preferably from 1% by weight to 10% by weight, relative to the total weight of the composition. Cationic polymer

[0112] The composition according to the present invention may include at least one cationic polymer, other than celluloses.

[0113] Preferably, said cationic polymer is selected from polyquaterniums, cationic guar gum derivatives, and mixtures thereof.

[0114] In some cases, the cationic polymer may include monomer motifs derived from quaternary amine and / or ammonium substituted monomer and / or compatible spacer monomers.

[0115] A suitable cationic polymer includes, for example: copolymers of 1-vinyl-2-pyrrolidine and l-vinyl-3-methylimidazolium salt (e.g., the chloride salt) (called Polyquaternium-16) such as those commercially available from BASF under the trade name LUVIQUAT (e.g., LUVIQUAT FC 370); copolymers of l-vinyl-2-pyrrolidine and dimethylaminoethyl methacrylate (called Polyquaternium-11) such as those commercially available from Gar Corporation (Wayne, NJ, USA) under the trade name GAFQUAT (e.g., GAFQUAT 755N); and a cationic polymer containing quaternary diallyl ammonium including, for example, a dimethyldiallyammonium chloride homopolymer and acrylamide and dimethyldiallyammonium chloride copolymers (called Polyquatemium-6 and Polyquaternium-7).

[0116] Un polymère cationique approprié peut inclure d’autres polyquaterniums, tels que polyquaternium-1, polyquaternium-2, polyquatemium-3, polyquatemium-4, polyquaternium-5, polyquaternium-8, polyquaternium-9, polyquaternium-10, polyquaternium-12, polyquaternium-13, polyquaternium-14, polyquaternium-15, polyquaternium-17, polyquaternium-18, polyquaternium-19, polyquaternium-20, polyquaternium-21, polyquaternium-22, polyquaternium-23, polyquaternium-24, polyquaternium-25, polyquaternium-26, polyquaternium-27, polyquaternium-28, polyquaternium-29, polyquaternium-30, polyquaternium-40, polyquaternium-41, polyquaternium-42, polyquaternium-43, polyquaternium-44, polyquaternium-45, polyquaternium-46, polyquaternium-47, polyquaternium-48, polyquaternium-49, polyquaternium-50, polyquaternium-51, polyquaternium-52, polyquaternium-53, polyquaternium-54, polyquaternium-55, polyquaternium-56, polyquaternium-57, polyquaternium-58, polyquaternium-59, polyquaternium-60, polyquaternium-61,polyquaternium-62, polyquaternium-63, polyquaternium-64, polyquaternium-65, polyquaternium-66, polyquaternium-67, and combinations thereof. ,

[0117] The preferred cationic guar gum derivative may be hydroxypropyltrimonium guar chloride, and preferably hydroxypropyl guar hydroxypropyltrimonium chloride.

[0118] According to the present invention, the cationic polymer, other than celluloses, is preferably chosen from polyquaterniums, cationic guar gum derivatives and mixtures thereof, more preferably chosen from cationic guar gum derivatives, is even more preferably guar hydroxypropyltrimonium chloride, and even more preferably guar hydroxypropyltrimonium chloride.

[0119] Advantageously, the cationic polymer is present in an amount ranging from 0.01% by weight to 10% by weight, preferably from 0.01% by weight to 3% by weight, more preferably from 0.05% by weight to 2% by weight, and even more preferably from 0.1% by weight to 1% by weight, relative to the total weight of the composition. Aqueous solvent

[0120] The composition of the present invention may include at least one aqueous solvent.

[0121] Preferably, the aqueous solvent of the composition according to the present invention includes water and one or more water-miscible or at least partially water-miscible compounds, for example polyols and C2-C8 monoalcohols.

[0122] The term "polyol" should be understood as any organic molecule comprising at least two free hydroxyl groups.

[0123] More preferably, the composition according to the present invention comprises water.

[0124] Advantageously, water is present in an amount ranging from 30% to 95% by weight, preferably from 40% to 90% by weight, and more preferably from 50% to 85% by weight, relative to the total weight of the composition. Additional ingredients

[0125] The composition according to the present invention may include one or more additional ingredients, chosen from those classically used in cleaning and / or care products for keratinous material, for example, hair and scalp.

[0126] The composition according to the present invention may include any of the following additives: pH correcting agents, biological extracts, perfumes, preservatives and chelating agents.

[0127] According to the present invention, non-limiting examples of pH-correcting agents include potassium acetate, potassium hydroxide, sodium carbonate, sodium hydroxide, sodium hydrogen carbonate, ethanolamines, and mixtures thereof. Sodium hydroxide is a particularly preferred pH-correcting agent.

[0128] A person skilled in the art can correct the type and quantity of additional ingredients present in the compositions according to the present invention by means of routine operations, so that the desired properties of these compositions are not negatively affected by the additional ingredients. Composition

[0129] According to the present invention, the composition comprising the above components is a cleansing and / or care composition for keratinous material, preferably of the hair and scalp.

[0130] According to the present invention, the composition comprising the above components is preferably in the form of a fluid, for example, a lotion, emulsion, paste, cream, or gel. In the context of this disclosure, the term "fluid" means that the composition can flow under an external force.

[0131] For the composition according to the present invention, the selenium sulfide forms aggregations in the composition, and the aggregations have an average size of 65 pm or less, preferably 62 pm or less, more preferably 50 pm or less, even more preferably 40 pm or less, even more preferably 30 pm or less, for example, 25 pm or less, or about 20 pm. For example, the selenium sulfide forms aggregations in the composition, and the aggregations have an average size ranging from 10 pm to 65 pm, preferably from 15 pm to 62 pm, more preferably from 20 pm to 50 pm, and even more preferably from 20 pm to 30 pm, and for example, about 25 pm.

[0132] The inventor discovers surprisingly that selenium sulfide aggregations having an average size of 65 pm or less in the composition can effectively improve the smooth texture sensation of keratinous material.

[0133] In the context of this disclosure, the terms "aggregates" and "selenium sulfide aggregates" refer to aggregations that are formed from the raw material of two or more selenium sulfide powders or particles and are larger than a single selenium sulfide powder or particle.

[0134] According to the present invention, the average size of the selenium sulfide aggregates in the composition is measured by the following method: a random drop of the composition is taken, placed on a slide, covered with a coverslip, and observed under a microscope; for each view, the three largest selenium sulfide aggregates are selected, the greatest length of each of the three aggregates is measured, and the average of the three greatest lengths is calculated to obtain the average size of the selenium sulfide aggregates. The microscope may be of any model or type capable of measuring the size of powders, particles, or aggregates. For example, the sizes of the selenium sulfide aggregates of the present invention can be measured using the Leika DM2500 microscope.

[0135] Preferably, for the composition according to the present invention, the weight ratio between alpha-hydroxy acid and selenium sulfide ranges from 0.5 to 1000, preferably from 0.5 to 800, more preferably from 0.5 to 600, more preferably from 0.5 to 500, more preferably from 0.5 to 200, more preferably from 0.5 to 100, more preferably from 0.5 to 50, even more preferably from 0.75 to 600, even more preferably from 1 to 300, even more preferably from 1.5 to 200, even more preferably from 2 to 100, even more preferably from 3 to 50, even more preferably from 3 to 20.

[0136] Preferably, the composition has a pH value of 2 to 6.5, preferably 2 to 6, more preferably 3.5 to 5.2.

[0137] Thanks to the specific components above, the composition according to the present invention can provide an improved dispersion of selenium sulfide in it and therefore an improved smooth texture sensation of the keratinous material, and even a desirable inhibition of microorganisms and thus a desired anti-dandruff efficacy, even at a lower pH value, for example, a pH value of 2 to 6.5.

[0138] According to the present invention, microorganisms include all microorganisms that can affect the skin, nails, hair, and scalp, as well as mucous membranes. Examples of microorganisms include, but are not limited to, non-dermatophytes (Candida species such as C. albicans, etc., Scopulariopsis species such as S. brevicaulis, and Malassezia spp.). These are yeasts represented by the genus Candida and by Malassezia furfur (formerly called pityrosporon). Candida affects the skin, nails, hair, and scalp, as well as mucous membranes. Malassezia furfur, which is a common saprophyte of the skin, particularly seborrheic skin, is the causative agent of pityriasis versicolor.

[0139] Moreover, thanks to the specific fatty amine as defined above, the composition comprising it can further improve the feeling of smooth texture of the keratinous material, even at a lower pH value, for example, a pH value of 2 to 6.5.

[0140] Thanks to the specific arginine and / or the cationic polymer as defined above, the composition comprising them can further improve the sensations of smooth texture and / or the sensation of softness of the keratinous material, even at a lower pH value, for example, a pH value of 2 to 6.5.

[0141] Thanks to the specific surfactant hydroxysultaine as mentioned above, the foaming property of the composition comprising it can be improved, even at a lower pH value, for example, a pH value of 2 to 6.5.

[0142] Thanks to the specific cellulose as mentioned above, the stability of the composition comprising it can be improved, even at a lower pH value, for example, a pH value of 2 to 6.5.

[0143] In a preferred embodiment, the present invention relates to a keratinous material cleansing and / or care composition, comprising: a. at least one alpha-hydroxy acid being a lower acid having 2 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, even more preferably 2 to 6 carbon atoms; b. at least one selenium sulfide; and optionally c. at least one fatty amine,

[0144] wherein selenium sulfide forms aggregations in the composition, and the aggregations have an average size ranging from 10 qm to 65 qm, and the composition optionally has a pH value of 2 to 6.5.

[0145] In a preferred embodiment, the present invention relates to a keratinous material cleansing and / or care composition, with respect to the total weight of the composition, comprising: a. 0.5% by weight to 8% by weight of at least one alpha-hydroxy acid being a lower acid having 2 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, even more preferably 2 to 6 carbon atoms; b. 0.005% to 5% by weight of at least one selenium sulfide; and optionally c. 0.05 wt% to 2 wt% of at least one fatty amine,

[0146] wherein selenium sulfide forms aggregations in the composition, and the aggregations have an average size ranging from 15 qm to 62 qm, and the composition optionally has a pH value of 2 to 6.5.

[0147] In a preferred embodiment, the present invention relates to a keratinous material cleansing and / or care composition, with respect to the total weight of the composition, comprising: a. 0.5% by weight to 8% by weight of at least one alpha-hydroxy acid being a lower acid having 2 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, even more preferably 2 to 6 carbon atoms; b. 0.005% by weight to 5% by weight of at least one selenium sulfide; c. 0.05% to 2% by weight of at least one amidoamine; and optionally d. 0.1% by weight to 8% by weight of at least one beta-hydroxy acid and / or its derivatives selected from salicylic acid, acetylsalicylic acid, capryloyl salicylic acid, and mixtures thereof,

[0148] wherein selenium sulfide forms aggregations in the composition, and the aggregations have an average size ranging from 20 qm to 50 qm, and the composition optionally has a pH value of 2 to 6.5.

[0149] In a more preferred embodiment, the present invention relates to a keratinous material cleansing and / or care composition, with respect to the total weight of the composition, comprising: a. 0.5% by weight to 8% by weight of at least one alpha-hydroxy acid being a lower acid having 2 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, even more preferably 2 to 6 carbon atoms; b. 0.005% by weight to 5% by weight of at least one selenium sulfide; c. 0.05% by weight to 2% by weight of at least one amidoamine; d. 0.1% by weight to 8% by weight of at least one beta-hydroxy acid and / or its derivatives selected from salicylic acid, acetylsalicylic acid, capryloyl salicylic acid and mixtures thereof; and optionally at least one of the following components: e. 0.05% by weight to 5% by weight of at least one cellulose; f. 0.5% by weight to 15% by weight of at least one type of surfactant hydroxysultaine; g. 1.2% by weight to 8% by weight of at least one nitrogen-containing compound selected from L-arginine, trolamine, tris(hydroxymethyl)aminomethane, ethanolamine, diethanolamine, and mixtures thereof; and h. 0.05% by weight to 2% by weight of at least one cationic guar gum derivative,

[0150] wherein selenium sulfide forms aggregations in the composition, and the aggregations have an average size ranging from 20 qm to 50 qm, and the composition optionally has a pH value of 2 to 6.5.

[0151] In a more preferred embodiment, the present invention relates to a keratinous material cleansing and / or care composition, with respect to the total weight of the composition, comprising: a. 1% by weight to 6% by weight of at least one alpha-hydroxy acid being a lower monocarboxylic acid having 2 to 8 carbon atoms, more preferably 2 to 6 carbon atoms, more preferably lactic acid; b. 0.01% by weight to 3% by weight of selenium sulfide; c. 0.1% by weight to 1% by weight of at least one amidoamine corresponding to the following formula (I):

[0152] RCONHR'N(R")2(I)

[0153] wherein R represents a hydrocarbon radical containing at least 6 carbon atoms, R' represents a divalent hydrocarbon radical containing less than 6 carbon atoms, and R" which may be identical or different, represents a hydrogen or a hydrocarbon radical containing less than 6 carbon atoms, and preferably brassicamidopropyl dimethylamine; a. 0.5% by weight to 6% by weight of beta-hydroxy acid and / or its derivatives selected from salicylic acid, acetylsalicylic acid, capryloyl salicylic acid, and mixtures thereof,

[0154] wherein selenium sulfide forms aggregations in the composition, and the aggregations have an average size ranging from 20 µm to 30 µm, and the composition optionally has a pH value of 3.5 to 5.2

[0155] In a more preferred embodiment, the present invention relates to a keratinous material cleansing and / or care composition, with respect to the total weight of the composition, comprising: a. 1% by weight to 6% by weight of lactic acid; b. 0.01% by weight to 3% by weight of selenium sulfide; c. 0.1% by weight to 1% by weight of brassicamidopropyl dimethylamine; and optionally d. 0.5% by weight to 6% by weight of salicylic acid,

[0156] wherein selenium sulfide forms aggregations in the composition, and the aggregations have an average size ranging from 20 qm to 30 qm, and the composition optionally has a pH value of 3.5 to 5.2.

[0157] According to an even more preferred embodiment, the present invention relates to a keratinous material cleansing and / or care composition, with respect to the total weight of the composition, comprising: a. 1% by weight to 6% by weight of lactic acid; b. 0.01% by weight to 3% by weight of selenium sulfide; c. 0.1% by weight to 1% by weight of brassicamidopropyl dimethylamine; d. 0.5% by weight to 6% by weight of salicylic acid; and optionally to minus one of the following components: e. 0.1% by weight to 1% by weight of unsubstituted cellulose; f. 1% by weight to 10% by weight of cocamidopropyl hydroxysultaine; g. 1.5% by weight to 5% by weight of L-arginine; and h. 0.1% by weight to 1% by weight of hydroxypropyl guar chloride hydroxypropyltrimonium;

[0158] wherein selenium sulfide forms aggregations in the composition, and the aggregations have an average size ranging from 20 qm to 30 qm, and the composition optionally has a pH value of 3.5 to 5.2. Process and use

[0159] The composition according to the present invention can be used in a process of cleaning and / or caring for keratinous material, preferably hair and scalp, by being applied to the keratinous material.

[0160] It has been found that the composition according to the present invention can provide an improved smooth texture sensation of the keratinous material, and optionally a desired anti-dandruff efficacy.

[0161] According to a second aspect, the present invention proposes a process for cleaning and / or caring for keratinous material, preferably hair and scalp, comprising the following steps: a. the application of the above composition to wet keratinous material, b. massaging the keratinous material for 2 seconds to 120 seconds, and c. rinsing the keratinous material with water.

[0162] Optionally, the process according to the present invention further includes step d) of drying the keratinous material.

[0163] According to a third aspect, the present invention proposes a process for preparing the above composition comprising an alpha-hydroxy acid, a selenium sulfide, and at least one additional component, comprising a step of premixing the alpha-hydroxy acid with the selenium sulfide in a weight ratio of 0.5 to 1000, preferably 0.5 to 600, more preferably 0.75 to 600, more preferably 1 to 100, more preferably 1.5 to 200, even more preferably 2 to 100, even more preferably 3 to 50, even more preferably 3 to 20, even more preferably about 5, before or after the addition of said additional component, wherein the additional component is preferably selected from one or more of the following: beta-hydroxy acid and / or its derivatives, fatty acid, anionic surfactant, cellulose, surfactant amphoteric, arginine,The cationic polymer and the aqueous solvent as defined above, and the alpha-hydroxy acid and selenium sulfide are both preferably defined above.

[0164] Advantageously, the present invention proposes a process for preparing the above composition, comprising: a. the addition of an anionic surfactant (if applicable) in water to form Premix 2; b. the addition of a fatty amine and a beta-hydroxy acid and / or its derivatives (if applicable) in Premix 2 to Premix 3; c. mixing selenium sulfide with an alpha-hydroxy acid to form Premix 3'; d. the addition of Premix 3' to Premix 3 to form Mixture 1; and e. correcting the pH value of Mixture 1 to a pH value ranging from 2 to 6.5, preferably from 2 to 6, more preferably from 3.5 to 5.2, to form the composition,

[0165] wherein the process optionally further comprises one or more steps of adding at least one cellulose, an amphoteric surfactant, an arginine and a cationic polymer, and each of said components in this process is defined above.

[0166] Thanks to this specific process of preparing the composition according to the present invention, selenium sulfide can be better dispersed in the composition, resulting in an improved smooth texture sensation of the keratinous material, and even a desirable anti-dandruff efficacy.

[0167] According to a fourth aspect, the present invention provides a composition which is prepared from the process according to the third aspect above, comprising: a. at least one alpha-hydroxy acid; and b. at least one selenium sulfide;

[0168] wherein the selenium sulfide forms aggregations in the composition, and the aggregations have an average size of 65 µm or less, preferably from 15 µm to 62 µm, more preferably from 20 µm to 50 µm, and even more preferably from 20 µm to 30 µm, and

[0169] preferably, the weight ratio between the alpha-hydroxy acid and the selenium sulfide ranges from 0.5 to 1000, preferably from 0.5 to 600, more preferably from 0.75 to 600, even more preferably from 1 to 300, even more preferably from 2 to 100, even more preferably from 3 to 50, even more preferably from 3 to 20, and / or the selenium sulfide is added as a raw material in powder form having a particle size (D90) ranging from 1 µm to 24 µm, preferably from 3 µm to 15 µm, and more preferably from 5 µm to 10 µm, and

[0170] wherein the additional component is preferably selected from one or more of the beta-hydroxy acid and / or its derivatives, fatty amine, anionic surfactant, cellulose, amphoteric surfactant, arginine, cationic polymer and aqueous solvent as defined above, and alpha-hydroxy acid and selenium sulfide are both preferably defined above.

[0171] According to a fifth aspect, the present invention proposes the use of an alpha-hydroxy acid to improve the dispersion of selenium sulfide in a composition comprising an aqueous solvent.

[0172] Preferably, the weight ratio between the alpha-hydroxy acid and the selenium sulfide ranges from 0.5 to 1000. More preferably, the weight ratio between the alpha- hydroxyacid and selenium sulfide range from 0.5 to 800, preferentially from 0.5 to 600, more preferentially from 0.5 to 500, more preferentially from 0.5 to 200, more preferentially from 0.5 to 100, more preferentially from 0.5 to 50, more preferentially from 0.75 to 600, even more preferentially from 1 to 300, even more preferentially from 1.5 to 200, even more preferentially from 2 to 100, even more preferentially from 3 to 50, even more preferentially from 3 to 20.

[0173] Preferably, the alpha-hydroxy acid is lactic acid.

[0174] Preferably, the aqueous solvent includes water and one or more water-miscible or at least partially water-miscible compounds, for example C2-C8 polyols and monoalcohols, and more preferably water.

[0175] Advantageously, water is present in an amount ranging from 30% to 95% by weight, preferably from 40% to 90% by weight, and more preferably from 50% to 85% by weight, relative to the total weight of the composition.

[0176] The present invention is illustrated in more detail by the examples described below, which are given by way of non-limiting illustration. EXAMPLES

[0177] The principal raw materials used, their trade names and suppliers have been listed in Table 1, and the materials not specified here were all commercially available.

[0178] [Table 1] Table 1 INCI Name Trade Name Supplier LACTIC ACID (LACTIC ACID) L-LACTIC ACID (90%) (CRG) MUSASHINO CHEMICAL LABORATORY SALICYLIC ACID (SALICYLIC ACID) AMIPRESERVE ALBAN MULLER (CR ODA) SELENIUM SULFIDE (SELENIUM SULFIDE) SELENIUM SULPHIDE EP / USP MICRONIZED ESKAY FINE CHEMICALS BRASSICAMIDOPROPYL D IMETHYLAMINE (BRASSIC AMIDOPROPYL DIMETHYLAMINE) PROCONDITION 2 INOLEX CHEMICAL COMPANY ARGININE L ARGININE KYOWA HAKKO COCAMIDOPROPYL HYDROXYSULTAINE (COCAMID TC-SHD 50 RSPO MB GUANGZHOU TINCI MATERIALS OPROPYL HYDROXYSULT AINE) CELLULOSE AQUALON CMC 7H3S XF ASHLAND

[0179] Comparative Examples 1 and 2 and Inventive Examples 1 to 8

[0180] The compositions according to Comparative Examples (CE) 1 and 2 and Inventive Examples (EX) 1 to 8 comprising the active ingredients indicated in Table 2 were prepared, all quantities being expressed as percentages by weight of active material relative to the total weight of each composition.

[0181] [Table 2] Table 2 Components Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7 Ex. 8 EC . 1 EC .2 Phase A WATER QS P 1 00 QS P 1 00 QS P 1 00 QS P 1 00 QS P 1 00 QS P 1 00 QS P 1 00 QS P 1 00 QS P 1 00 QS P 1 00 H YDROXYPROPY CHLORIDE L GUAR HYDRO XYPROPYL-TRI MONIUM / / / / / 0.3 / / / / CELLULOSE / / / / / 0.2 / / / / Phas eB COCAMIDOPRO PYL HYDROXY SULTAINE / / / / / 2.5 / / / / LAURETH SULFATE OF SODIU M 14 14 14 14 14 14 14 14 14 14 Phases eC SALICYL IC ACID 1.5 1.5 1.5 1.5 1.5 1.5 1.5 / 1.5 1.5 BRASSICAMIDO -PROPYL DIMET HYLAMINE 0.3 0.3 0.3 0.3 / 0.3 0.3 / 0.3 0.3 ARGININE / / / / / 2 / / / / Phase D LACTIC ACID 3 0.6 0.4 0.3 3 3 6 3 / 0.2 SELENIUM SULFIDE (D90: not more than 10 pm) 0.6 0.6 0.6 0.6 0.6 0.6 0.01 0.6 0.6 0.6 pH (SODIUM HYDROXIDE) 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 Average size of selenium sulfide aggregates (pm)* 25 40 50 62 25 25 20 25 80 72

[0182] * : Measurement of the average size of selenium sulfide aggregates: For For each of the compositions in Inventive Examples 1 to 8 and Comparative Examples 1 and 2, a random drop of the composition was taken, poured onto a slide, covered with a coverslip and observed under a Leika DM2500 microscope. For one view, the three largest selenium sulfide aggregates were selected, the greatest length of each of the three aggregates was measured and the average of the three greatest lengths was calculated to obtain the average size of the selenium sulfide aggregates. Preparation process

[0183] The composition was prepared from a process comprising the following steps: 1. Mixing each component of phase A until Premix 1 is formed; 2. Adding each component of phase B into Premix 1 and mixing them until it is transparent to form Premix 2; 3. Addition of each component of Phase C, if applicable, into Premix 2 to form Premix 3; 4. mixing of selenium sulfide with lactic acid, if lactic acid was present, to form Premix 3'; 5. Adding Premix 3' to Premix 3 and mixing them until homogenized to form Mixture 1; 6. Correction of the pH value of Mixture 1 to 3.8 by adding sodium hydroxide to form the final composition. Composition evaluation

[0184] The compositions as prepared were evaluated in terms of smooth texture feel and anti-dandruff efficacy. Smooth texture feel test

[0185] The smooth texture of each composition in Inventive Examples 1 to 8 and Comparative Examples 1 and 2 was evaluated as follows: I. Hair treatment with the following composition:

[0186] A strand of damaged hair was selected. The hair was combed and wetted under running water. The composition was applied evenly to the damaged hair from root to tip and gently massaged with two fingers from root to tip (without creating a knot) to lather the composition. The composition was rinsed under running tap water until all lather was removed. I. Evaluation of the smooth texture in the wet state:

[0187] The strand of hair was stroked with two fingers from the root, and the smoothness of the surface of the strand was assessed by 6 volunteers. They gave scores shown below, and the average of the scores was calculated.

[0188] The rating standard for the smooth texture feel of each composition was as follows.

[0189] Score 1: the lock of hair was very difficult to comb, comb jammed 9 to 10 times by tangled hair;

[0190] Score 2: the lock of hair was moderately difficult to comb, comb jammed 7 to 8 times by tangled hair;

[0191] Score 3: the lock of hair was slightly difficult to comb, comb jammed 5 to 6 times by tangled hair;

[0192] Score 4: the lock of hair was easy to comb, comb jammed 3 to 4 times by tangled hair; and

[0193] Score 5:1a strand of hair was very easy to comb, comb jammed 2 times or less by tangled hair.

[0194] The results of the smooth texture sensation for the compositions of Inventive Examples 1 to 8 and Comparative Examples 1 and 2 were presented in the following Table 3.

[0195] [Table 3] Table 3 Properties Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7 Ex. 8 EC. 1 EC. 2 Texture sensation 1 smooth (hair feel) 5 3 3 3 3 5 3 3 1 1

[0196] From the data shown in Table 3, it can be seen that all the compositions in Inventive Examples 1 to 8, in which the aggregates formed from selenium sulfide have an average size of 65 µm or less, can achieve a score of 3 or higher for the evaluation of smooth texture. In contrast, each of the compositions in Comparative Examples 1 and 2, in which the aggregates formed from selenium sulfide have an average size of 70 µm or more, can only achieve a score of 1, i.e., a very poor smooth texture. Anti-dandruff efficacy trial

[0197] The anti-dandruff efficacy of each composition of Inventive Examples 1 and 5 to 7 was evaluated as follows: 15 ml of each test sample were diluted by a factor of 10 and kept at a temperature of 20 °C for 5 min. The diluted sample was rapidly and immediately mixed with a Malassezia furfur test solution. After contact for 5 min, the surviving microorganisms were tested by plate counting.

[0198] The results of the anti-dandruff efficacy of the compositions of Inventive Examples 1 and 5 to 7 have been presented respectively in the following Table 4.

[0199] [Table 4] Table 4 Properties Ex. 1 Ex. 5 Ex. 6 Ex. 7 % inhibition of Malassezia Furfur (5 min) 99.99% 99.99% 99.99% 99.99%

[0200] From the data as presented in Table 4, it can be seen that the compositions of Inventive Examples 1 and 5 to 7 can provide inhibition of up to 99.99%, i.e. provide the desired anti-dandruff efficacy.

[0201] In summary, the compositions of the present invention can provide an improved smooth texture sensation and, optionally, a desired anti-dandruff efficacy.

Claims

Demands

1. Composition, preferably for cleansing and / or caring for keratinous material, comprising: a) at least one alpha-hydroxy acid; and b) at least one selenium sulfide, wherein the selenium sulfide forms aggregations in the composition, and the aggregations have an average size of 65 pm or less.

2. Composition according to claim 1, wherein the alpha-hydroxy acid is a lower acid having 2 to 12 carbon atoms, more preferably a lower monocarboxylic acid having 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms, and is most preferably lactic acid.

3. Composition according to any one of the preceding claims, wherein selenium sulfide forms aggregations in the composition, and the aggregations have an average size ranging from 10 pm to 65 pm, preferably from 15 pm to 62 pm, more preferably from 20 pm to 50 pm, and even more preferably from 20 pm to 30 pm.

4. Composition according to any one of the preceding claims, wherein the weight ratio of alpha-hydroxy acid to selenium sulfide is from 0.5 to 1000, preferably from 0.5 to 600, more preferably from 0.75 to 600, more preferably from 1 to 300, even more preferably from 1.5 to 200, even more preferably from 2 to 100, even more preferably from 3 to 50, most preferably from 3 to 20.

5. A composition according to any one of the preceding claims, further comprising at least one fatty amine, preferably selected from amidoamines corresponding to the following formula (I): RCONHR'N(R")2(I) in which R represents a hydrocarbon radical containing at least 6 carbon atoms, R' represents a divalent hydrocarbon radical containing fewer than 6 carbon atoms, and R", which may be the same or different, represents hydrogen or a hydrocarbon radical containing fewer than 6 carbon atoms, and

6. more preferably, is chosen from the group consisting of oleamidopropyl dimethylamine, stearamidopropyl dimethylamine, isostearamidopropyl dimethylamine, stearamidoethyl dimethylamine, lauramidopropyl dimethylamine, myristamidopropyl dimethylamine, behenamidopropyl dimethylamine, dilinoleamidopropyl dimethylamine, palmitamidopropyl dimethylamine, ricinoleamidopropyl dimethylamine, sojamidopropyl dimethylamine, bleamidopropyl dimethylamine, sunfloweramidopropyl dimethylamine, almondamidopropyl dimethylamine, avocadoamidopropyl dimethylamine, babassuamidopropyl dimethylamine, cocamidopropyl dimethylamine, visonamidopropyl dimethylamine, avoinamidopropyl dimethylamine, sesamidopropyl dimethylamine, tallamidopropyl dimethylamine, brassicamidopropyl dimethylamine, olivamidopropyl dimethylamine, stearamidoethyl diethylamine, stearamidopropyl diethylamine, palmitamidopropyl diethylamine,palmitamidoethyl diethylamine, palmitamidoethyl dimethylamine, behenamidopropyl diethylamine, behenamidoethyl diethylamine, behenamidoethyl dimethylamine, arachidamidopropyl dimethylamine, arachidamidopropyl diethylamine, arachidamidoethyl, 1. Diethylamine, arachidamidoethyl dimethylamine, diethylaminoethylstearamide, and mixtures thereof; and most preferably, brassicamidopropyl dimethylamine. Composition according to any one of the preceding claims, further comprising at least one beta-hydroxy acid and / or its derivatives, which is preferably selected from salicylic acid, its derivatives acylated at the hydroxyl group, and its derivatives of formula (II): in which, R represents a linear, branched or cyclic saturated aliphatic group or an unsaturated aliphatic group containing one or a number of double bonds, which may or may not be conjugated, these groups containing from 2 to 22, preferably from 3 to 11 carbon atoms and being optionally substituted by at least one substituent selected from (a) halogen atoms, (b) the trifluoromethyl group, (c) hydroxyl groups in free form or esterified by an acid having from 1 to 6 carbon atoms or (d) a carboxyl functional group which is free or esterified by an inferior alcohol having from 1 to 6 carbon atoms; R' represents a hydroxyl group or an ester functional group of the following formula (III): ---O--C — Rj (III) O wherein Ri is a saturated or unsaturated, linear or branched aliphatic group having from 1 to 18 carbon atoms, preferably from 4 to 15 carbon atoms; and is most preferentially chosen from salicylic acid, acetylsalicylic acid, capryloyl salicylic acid, and mixtures thereof, and most preferentially salicylic acid.

7. Composition according to any one of the preceding claims, further comprising at least one anionic surfactant, preferably selected from alkyl ether sulfates conforming to formula (IV): (IV) in which, R represents a hydrogen or an alkyl chain having 6 to 24 carbon atoms, preferably 8 to 18 carbon atoms, and more preferably 12 to 18 carbon atoms; M is a solubilizing cation such as alkali metal ions, ammonium or substituted ammonium ions, or alkanolammonium ions; and n is an integer from 0 to 3, preferably between 1 and 3, more preferably between 2 and 3; and is most preferably sodium laureth sulfate, and in which the anionic surfactant is preferably present in an amount ranging from 1% by weight to 30% by weight, preferably from 5% by weight to 25% by weight, and more preferably from 10% by weight to 20% by weight, relative to the total weight of the composition.

8. A keratinous material cleansing and / or care composition, relative to the total weight of the composition, comprising: a) 1% to 6% by weight of at least one alpha-hydroxy acid being a lower monocarboxylic acid having 2 to 8 carbon atoms, more preferably 2 to 6 carbon atoms, more preferably lactic acid; b) 0.01% to 3% by weight of selenium sulfide; c) 0.1% to 1% by weight of at least one amidoamine corresponding to the following formula (I): RCONHR'N(R")2(I) in which R represents a hydrocarbon radical containing at least 6 carbon atoms, R' represents a divalent hydrocarbon radical containing less than 6 carbon atoms, and R" which may be the same or different, represents a hydrogen or hydrocarbon radical containing less than 6 carbon atoms, and preferably brassicamidopropyl dimethylamine;d) 0.5% by weight to 6% by weight of beta-hydroxy acid and / or its derivatives selected from salicylic acid, acetylsalicylic acid, capryloyl salicylic acid, and mixtures thereof, wherein selenium sulfide forms aggregations in the composition, and the aggregations have an average size ranging from 20 pm to 30 pm, and the composition optionally has a pH value of 3.5 to 5.

2.

9. A process for cleaning and / or caring for keratinous material, preferably hair and scalp, comprising the following steps: a) applying the composition according to any one of claims 1 to 8 to the wet keratinous material, b) massaging the keratinous material for 2 seconds to 120 seconds, and c) rinsing the keratinous material with water.

10. Process for preparing a composition comprising an alpha-hydroxy acid, a selenium sulfide and at least one additional component, comprising a premixing step of the alpha- hydroxy acid with selenium sulfide at a weight ratio of 0.5 to 1000, preferably 0.5 to 600, more preferably 0.75 to 600, more preferably 1 to 300, even more preferably 1.5 to 200, even more preferably 2 to 100, even more preferably 3 to 50, most preferably 3 to 20, before or after the addition of said additional component, wherein the additional component is preferably selected from one or more of the beta-hydroxy acid and / or its derivatives, fatty amine, anionic surfactant, cellulose and arginine, as defined according to any one of claims 5 to 7, and the alpha-hydroxy acid and selenium sulfide are both preferably defined according to any one of claims 1 to 8.