Cosmetic composition comprising 2, 4-diaminopyrimidine 3-N-oxide, piroctone olamine salt, nicotinamide and at least 1% by weight of specific hydroxylated compound

Abstract

The present invention relates to a cosmetic composition comprising 2, 4-diaminopyrimidine 3-N-oxide and / or an organic or inorganic acid salt thereof and / or a hydrate thereof, a piroctone olamine salt, nicotinamide and at least 1% by weight of a specific hydroxylated compound. The invention also relates to a method for the cosmetic treatment of human keratin materials, such as the skin, in particular the human scalp, hair and / or eyelashes, comprising at least the application of a cosmetic composition according to the invention. The invention also relates to the use of said cosmetic composition for treating loss of keratin fibres and / or promoting regeneration of keratin fibres.

Description

Technical Field

[0001] The present invention relates to a cosmetic composition comprising 2,4-diaminopyrimidine 3-N-oxide and / or its organic or inorganic salts and / or its hydrates, piroctone olamine, niacinamide and at least 1% by weight of a specific hydroxylated compound.

[0002] The present invention also relates to a method for the cosmetic treatment of human keratin materials such as skin, in particular the human scalp, hair and / or eyelashes, the method comprising at least the application of a cosmetic composition according to the invention.

[0003] The present invention also relates to the use of said cosmetic composition for treating the loss of keratin fibers and / or promoting the regeneration of keratin fibers.

[0004] The present invention relates to the field of cosmetic treatment of human keratin materials, in particular human keratin fibers such as human hair, eyebrows, eyelashes and / or body hair, especially beard, moustache and pubic hair, and the skin (especially the scalp) and skin areas (especially bald or non-bald areas, preferably bald areas) covering such keratin fibers as mentioned above. More particularly, the present invention relates to the cosmetic treatment of human hair and / or eyelashes and / or skin, preferably hair and / or scalp. Background Art

[0005] The growth and renewal of human hair are mainly determined by the activity of hair follicles and their dermal-epidermal environment. Their activity is cyclic and basically includes three phases, namely the anagen phase, the catagen phase and the telogen phase.

[0006] The anagen phase (corresponding to the active or growth phase), which lasts for several years and during which the hair grows longer, is followed by a very short and transient catagen phase that lasts for several weeks. During this phase, the hair bundle undergoes changes, the hair follicle atrophies, and its dermal implantation position appears to move increasingly upwards.

[0007] The final phase, which lasts for several months, corresponds to a resting phase called the telogen phase. At the end of this resting phase, the hair falls out and is replaced by new hair follicles in the anagen phase, thus starting another hair cycle.

[0008] Thus, hair is constantly renewed, and among the approximately 150,000 individual hairs that make up a full head of hair, at any given time approximately 10% are in a dormant state and will therefore be replaced in the next few months.

[0009] Hair loss refers to the accelerated loss of hair, eyelashes, eyebrows and / or body hair on any part of the body. It usually occurs in individuals with a genetic predisposition and mainly affects men. This is called androgeneticalopecia or androgenic alopecia, or even androgeno-genetic alopecia.

[0010] Hair loss is essentially due to a disorder in hair renewal, which initially leads to an acceleration of the cycle frequency at the expense of hair quality and then its quantity. This results in a gradual impoverishment of hair through the regression of "terminal" hair to the vellus stage. Certain areas are preferentially affected: especially in men, the temporal or frontal lobes and also the upper occipital lobe, while in women, diffuse hair loss on the top of the head is visible.

[0011] Other causes can lead to severe temporary or permanent hair loss. These causes may include hair loss and damage after pregnancy (or post-partum), hair loss and damage during malnutrition or dietary imbalance, or even weakness or hormonal dysfunction (such as may occur during or after menopause). It can also be a case of hair loss or damage related to seasonal phenomena.

[0012] Hair loss can also affect eyelashes, eyebrows and / or body hair on any part of the human body, and can cause aesthetic dissatisfaction, just as hair loss affects one or more areas of the scalp.

[0013] Therefore, people prone to hair loss increasingly turn to cosmetic treatments that enable them to eliminate and / or reduce the effects of hair loss, and especially to reduce or delay the loss of hair, eyelashes and / or body hair, as well as to induce or stimulate their growth.

[0014] Such treatments usually consist of daily application to various hair loss areas of the body, especially to the hair loss areas of the scalp (such as the temporal or frontal lobes in men), or areas of the body without hair (especially on the face, especially the beard, moustache and / or eyebrows), of a cosmetic composition containing one or more agents for combating hair loss and / or promoting hair regeneration.

[0015] For this purpose, mention may be made in particular of agents such as minoxidil, finasteride, unoxidil or stemoxydine as agents capable of reducing the loss of keratin fibres and / or promoting the regeneration of keratin fibres.

[0016] The duration of these treatments generally ranges from a few weeks to several months and may even last for several years, and their long-term efficacy often depends on the user's consistent and regular application of the cosmetic composition to the area to be treated (which can be large or small).

[0017] Treatments that can reduce hair, lash, and / or body hair loss and / or promote hair, lash, and / or body hair regrowth can in particular last for a few weeks, after which the desired effects (especially curbing hair loss) can start to be seen.

[0018] These treatments must be used daily to achieve significant efficacy.

[0019] However, these compositions still often have many application drawbacks, which can have an adverse effect on the beauty treatments to be followed, especially leading to more or less rapid abandonment of the treatment and thus resulting in poor results in terms of limiting or even eliminating hair loss.

[0020] Specifically, many compositions contain gelling agents to prevent the composition from flowing onto the face, into the eyes, or down the nape of the neck. However, the use of gelling agents (especially in the case of daily use) can lead to the aggregation of keratin fibers, giving the whole head of hair a sticky effect unacceptable to consumers.

[0021] To improve the efficacy of these treatments, it may be necessary to increase the amount of active agents, which can lead to difficulty in dissolving the active agents and result in the formation of visible powder on the keratin fibers and the scalp during use. This powdery effect is also unacceptable to consumers. Lotions for combating hair loss must be used daily to achieve significant efficacy. Some consumers wash their hair every day, in which case the product previously applied to the scalp is removed. Most consumers do not wash their hair every day, and thus the product applied the next day is added to the product applied on the first day. This is called the cumulative effect. In the case of repeated application without washing the scalp, the powder may appear from the first day, usually on the second day. The appearance of this powder is caused by the precipitation of solid compounds in the formulation when the solvent evaporates.

[0022] Therefore, the insufficient application quality of these compositions may in the long term hinder the user from consistently following the beauty treatments for combating hair loss and / or promoting hair regrowth, especially when the efficacy of these treatments is mainly related to the daily and regular application of the previously described compositions to the area to be treated for several weeks or even months.

[0023] In other words, the lack of regularity or the too rapid abandonment of the treatment generally leads to poor results in terms of the efficacy of combating hair loss and / or promoting hair regrowth, and thus to consumer dissatisfaction. This leads to even greater disappointment for consumers who do not have the time to observe the long-term progress and / or efficacy of these treatments. Summary of the Invention

[0024] Therefore, there is indeed a need to overcome the drawbacks mentioned above, in particular by using a composition as follows, which is capable of treating, in a cosmetic manner and effectively, the loss of human keratin fibers such as human hair, body hair and / or eyelashes, and / or promoting their regrowth, which composition has improved application quality, while in particular providing a satisfactory visual effect, in particular without a greasy effect and without residues. The composition must also allow repeated application, i.e. allow the composition to be used daily.

[0025] This object is achieved by the present invention, the subject of which is in particular a cosmetic composition comprising:

[0026] i) 2,4-diaminopyrimidine 3-N-oxide and / or its organic or inorganic salts and / or its hydrates,

[0027] ii) piroctone olamine,

[0028] iii) niacinamide, and

[0029] iv) one or more hydroxylated compounds in an amount of at least 1% by weight relative to the total weight of the composition, these hydroxylated compounds having a melting point below 25 °C at atmospheric pressure (1.013×10 5 Pa) (for example they are liquid at 25 °C and atmospheric pressure) and a boiling point greater than or equal to 170 °C, these hydroxylated compounds being preferably selected from hydroxylated compounds consisting of C2-C8 hydrocarbon chains optionally interrupted by oxygen atoms and containing one or two free hydroxyl groups (-OH) carried by different carbon atoms.

[0030] The cosmetic composition according to the invention has improved application quality by avoiding the formation of a powdery effect and / or an aggregation effect on the keratin fibers (especially in the case of repeated application required for frequent use).

[0031] In terms of its efficacy in combating the loss of keratin fibers and / or promoting the regrowth of keratin fibers, the cosmetic composition according to the invention is also entirely satisfactory. The composition also has a beneficial effect on increasing the diameter of the keratin fibers and strengthening the fibers against breakage.

[0032] In addition, the composition according to the invention imparts good cosmetic properties (especially conditioning properties) to the keratin fibers, in particular in terms of softness, detangling and smoothness. It also allows easy detangling.

[0033] The present invention also relates to a method for the cosmetic treatment of human keratin materials, such as the skin, in particular the human scalp, hair and / or eyelashes, which method comprises at least the application of a cosmetic composition according to the invention.

[0034] The present invention also relates to the use of said cosmetic composition for treating the loss of keratin fibers and / or for promoting the regeneration of keratin fibers.

[0035] The present invention also relates to the use of said cosmetic composition for increasing the diameter of keratin fibers and / or for strengthening keratin fibers against breakage. Detailed Description

[0036] Other subjects, features, aspects and advantages of the present invention will become even clearer on reading the following description and examples.

[0037] In the text below, unless otherwise indicated, the limits of the ranges of values are included in the range, in particular in the expressions "between... and" and "ranging from... to...".

[0038] Furthermore, the expression "at least one" used in the present specification is equivalent to the expression "one or more".

[0039] i) 2,4-Diaminopyrimidine 3-N-oxide

[0040] The cosmetic composition according to the invention comprises 2,4-diaminopyrimidine 3-N-oxide and / or its organic or inorganic salts and / or its hydrates.

[0041] 2,4-Diaminopyrimidine 3-N-oxide has the following formula:

[0042]

[0043] Among the organic or inorganic salts that can be used, mention may be made in particular of the hydrochloride, sulfate, citrate and acetate. As hydrates, mention may be made in particular of the monohydrate.

[0044] Preferably, the non-salified compound in the form of the monohydrate is used.

[0045] Preferably, the total content of 2,4-diaminopyrimidine 3-N-oxide and / or its organic or inorganic salts and / or its hydrates ranges from 0.05% to 8% by weight, more preferably from 0.1% to 5% by weight, even more preferably from 0.2% to 4% by weight, then from 0.5% to 3% by weight, and preferably from 1% to 2% by weight, relative to the total weight of the composition.

[0046] Preferably, the content of 2,4-diaminopyrimidine 3-N-oxide and / or its hydrate (especially the monohydrate) ranges from 0.05% to 8% by weight, more preferably from 0.1% to 5% by weight, even more preferably from 0.2% to 4% by weight, from 0.5% to 3% by weight, and preferably from 1% to 2% by weight relative to the total weight of the composition.

[0047] ii) Zinc pyrithione

[0048] The cosmetic composition according to the invention further comprises piroctone olamine.

[0049] Piroctone olamine is the monoethanolamine salt of 1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(1H)-pyridinone.

[0050] Preferably, the total content of piroctone olamine ranges from 0.05% to 2% by weight, more preferably from 0.1% to 1% by weight, and preferably from 0.1% to 0.5% by weight relative to the total weight of the composition.

[0051] iii) Niacinamide

[0052] The cosmetic composition according to the invention further comprises nicotinamide (3-pyridinecarboxamide).

[0053] Nicotinamide is also known as niacinamide.

[0054] Preferably, the total content of nicotinamide ranges from 1% to 5% by weight, and preferably from 2% to 5% by weight relative to the total weight of the composition.

[0055] iv) Hydroxylated compounds

[0056] The cosmetic composition according to the invention further comprises one or more hydroxylated compounds iv) which have a melting point below 25 °C at atmospheric pressure (1.013×10 5 Pa) (for example they are liquid at 25 °C and atmospheric pressure) and a boiling point greater than or equal to 170 °C.

[0057] Preferably, the hydroxylated compound iv) consists of a C2-C8 hydrocarbon chain optionally interrupted by an oxygen atom and containing one or two free hydroxyl groups (-OH) carried by different carbon atoms.

[0058] These compounds can be cyclic or acyclic, straight-chain or branched-chain, saturated or unsaturated.

[0059] Preferably, the hydroxylated compound (iv) is selected from linear C2-C8, more preferably C2-C6 diols or aromatic C6-C8, more preferably C7-C8 monohydric alcohols and mixtures thereof. Even more preferably, the hydroxylated compound (iv) is selected from linear C2-C8, preferably C2-C6 diols.

[0060] Mention may be made in particular of propylene glycol, butylene glycol, pentylene glycol, hexylene glycol, 1,3-propanediol, benzyl alcohol, phenethyl alcohol (phenylethyl alcohol) and dipropylene glycol, and even more preferably, the hydroxylated compound (iv) is propylene glycol.

[0061] The total content of the hydroxylated compound (iv) in the composition is greater than or equal to 1% by weight, preferably greater than or equal to 1.5% by weight, relative to the total weight of the composition.

[0062] Preferably, the total content of the hydroxylated compound (iv) ranges from 1% to 15% by weight, more preferably from 1.5% to 10% by weight, even more preferably from 2% to 8% by weight, still more preferably from 2.1% to 6% by weight, even more preferably from 2.2% to 5% by weight, and even more preferably from 2.3% to 4% by weight, relative to the total weight of the composition.

[0063] Preferably, the total content of the hydroxylated compound (iv) selected from linear C2-C8 diols is greater than or equal to 1% by weight, more preferably ranges from 1% to 15% by weight, preferably ranges from 1.5% to 10% by weight, even more preferably from 2% to 8% by weight, still more preferably from 2.1% to 6% by weight, even more preferably from 2.2% to 5% by weight, and even more preferably from 2.3% to 4% by weight, relative to the total weight of the composition.

[0064] Preferably, the total content of propylene glycol is greater than or equal to 1% by weight, more preferably ranges from 1% to 15% by weight, preferably from 1.5% to 10% by weight, even more preferably from 2% to 8% by weight, still more preferably from 2.1% to 6% by weight, even more preferably from 2.2% to 5% by weight, and even more preferably from 2.3% to 4% by weight, relative to the total weight of the composition.

[0065] v) Ginger root extract

[0066] The cosmetic composition according to the invention may also optionally comprise ginger root extract (INCI name: Zingiber officinale Root Extract).

[0067] The ginger root extract may be in crushed, powdered or liquid form, preferably in liquid form.

[0068] The ginger root extract can in particular be obtained by means of supercritical CO2 extraction from ginger root fragments (such as ginger root powder).

[0069] Preferably, the composition according to the invention comprises a ginger root extract.

[0070] When the ginger root extract is present in the composition according to the invention, its total content preferably ranges from 0.02% to 0.2% by weight, more preferably from 0.05% to 0.2% by weight, relative to the total weight of the composition.

[0071] vi) Solvent

[0072] The composition according to the invention may optionally comprise one or more organic solvents other than the hydroxylated compounds iv) described previously.

[0073] These organic solvents are preferably selected from C1-C5 monohydric alcohols, preferably C2-C4 monohydric alcohols. Particularly preferably, ethanol is used.

[0074] Preferably, the composition comprises one or more organic solvents other than the hydroxylated compounds iv) described previously, preferably one or more C2-C4 monohydric alcohols, even more preferably ethanol.

[0075] When an organic solvent other than the hydroxylated compound iv) is present, its total content preferably ranges from 1% to 60% by weight, preferably from 5% to 50% by weight, more preferably from 10% to 40% by weight, even more preferably from 20% to 35% by weight, relative to the total weight of the composition.

[0076] When the composition comprises ethanol, the ethanol content preferably ranges from 1% to 60% by weight, preferably from 5% to 50% by weight, more preferably from 10% to 40% by weight, even more preferably from 20% to 35% by weight, relative to the total weight of the composition.

[0077] The composition is preferably aqueous, and the water content can range from 10% to 90% by weight, preferably from 20% to 80% by weight, and preferably from 40% to 70% by weight, relative to the total weight of the composition.

[0078] vii) Thickening polymer

[0079] The composition according to the invention may optionally comprise one or more thickening polymers.

[0080] According to the invention, the term "thickening polymer" means such compounds which, at room temperature (25 °C), at atmospheric pressure and at 1 s -1At a shear rate of, their presence at a concentration of 0.05% by weight increases the viscosity of the composition into which they are introduced by at least 20 cps (20 mPa·s), preferably by at least 50 cps (50 mPa·s) (the viscosity can be measured using a cone / plate viscometer, a Haake R600 rheometer, etc.).

[0081] The thickening polymers that can be used in the process according to the invention are preferably selected from non - associative thickening polymers with sugar units, non - associative thickening polymers without sugar units, associative thickening polymers, and mixtures thereof.

[0082] For the purposes of the present invention, the term "sugar unit" means a hydrocarbon - based compound with oxygen, containing several alcohol functional groups, with or without aldehyde or ketone functional groups, and containing at least 4 carbon atoms.

[0083] The sugar units can be optionally modified by substitution and / or by oxidation and / or by dehydration.

[0084] The sugar units of the thickening polymers are preferably derived from the following sugars: glucose, galactose, arabinose, rhamnose, mannose, xylose, fucose, anhydrogalactose, galacturonic acid, glucuronic acid, mannuronic acid, galactose sulfate, anhydrogalactose sulfate, and fructose.

[0085] According to the present invention, polymers with sugar units are also called polysaccharides.

[0086] Non - associative thickening polymers with sugar units that can be particularly mentioned include native gums, such as:

[0087] a) Exudates from trees or shrubs, including:

[0088] - Gum arabic (a branched polymer of galactose, arabinose, rhamnose, and glucuronic acid);

[0089] - Tragacanth gum (a polymer derived from arabinose, galactose, mannose, xylose, and glucuronic acid);

[0090] - Karaya gum (a polymer derived from galacturonic acid, galactose, rhamnose, and glucuronic acid);

[0091] - Tragacanth (a polymer of galacturonic acid, galactose, fucose, xylose, and arabinose);

[0092] b) Gums derived from algae, including:

[0093] - Agar (a polymer derived from galactose and anhydrogalactose);

[0094] - Alginates (polymers of mannuronic acid and glucuronic acid);

[0095] - Carrageenan and furcelleran (polymers of galactose sulfate and anhydrogalactose sulfate);

[0096] c) Gums derived from seeds or tubers, including:

[0097] - Guar gum (a polymer of mannose and galactose);

[0098] - Locust bean gum (a polymer of mannose and galactose);

[0099] - Fenugreek gum (a polymer of mannose and galactose);

[0100] - Tamarind gum (a polymer of galactose, xylose and glucose);

[0101] - Konjac gum (a polymer of glucose and mannose);

[0102] d) Microbial gums, including:

[0103] - Xanthan gum (a polymer of glucose, mannose acetate, mannose / pyruvate and glucuronic acid);

[0104] - Gellan gum (a partially acylated polymer of glucose, rhamnose and glucuronic acid);

[0105] - Scleroglucan gum (a glucose polymer);

[0106] e) Plant extracts, including:

[0107] - Cellulose (a glucose polymer);

[0108] - Starch (a glucose polymer); and

[0109] - Inulin.

[0110] These polymers can be physically or chemically modified. As physical treatment, temperature can be mentioned in particular.

[0111] Chemical treatments that can be mentioned include esterification, etherification, amidation or oxidation reactions. These treatments make it possible to produce polymers that can be, in particular, non-ionic, anionic or amphoteric.

[0112] Preferably, these chemical or physical treatments are applied to guar gum, locust bean gum, starch and cellulose.

[0113] The non-ionic guar gum that can be used according to the invention can be modified with C1-C6 (poly)hydroxyalkyl.

[0114] Among the C1-C6 (poly)hydroxyalkyl, for example, hydroxymethyl, hydroxyethyl, hydroxypropyl and hydroxybutyl can be mentioned.

[0115] These guar gums are well known in the prior art and can be prepared, for example, by reacting the corresponding alkylene oxide, such as propylene oxide, with guar gum in order to obtain a guar gum modified with hydroxypropyl groups.

[0116] The degree of hydroxyalkylation preferably ranges from 0.4 to 1.2 and corresponds to the number of alkylene oxide molecules consumed by the number of free hydroxy functional groups present on the guar gum.

[0117] Such non-ionic guar gums optionally modified with hydroxyalkyl groups are sold, for example, by Rhodia Chimie under the trade names Jaguar HP8, Jaguar HP60 and Jaguar HP120.

[0118] The plant source of the starch molecules that can be used in the present invention can be cereals or tubers. Thus, the starch is selected from, for example, corn starch, rice starch, cassava starch, barley starch, potato starch, wheat starch, sorghum starch and pea starch.

[0119] The starch can be chemically or physically modified in particular by one or more of the following reactions: pregelatinization, oxidation, crosslinking, esterification, etherification, amidation, heat treatment.

[0120] It is preferred to use distarch phosphates or compounds rich in distarch phosphates, such as products sold by Avebe under the index numbers Prejel VA-70-T AGGL (gelatinized hydroxypropyl tapioca distarch phosphate), Prejel TK1 (gelatinized tapioca distarch phosphate) or Prejel 200 (gelatinized acetylated tapioca distarch phosphate), or Structure Zea (gelatinized corn distarch phosphate) from National Starch.

[0121] According to the present invention, amphoteric starches can also be used, which contain one or more anionic groups and one or more cationic groups. The anionic groups and the cationic groups can be bound to the same reaction site or different reaction sites of the starch molecule; they are preferably bound to the same reaction site. The anionic groups can be of the carboxylate, phosphate or sulfate type, preferably of the carboxylate type. The cationic groups can be of the primary amine, secondary amine, tertiary amine or quaternary amine type.

[0122] The starch molecule can be derived from any plant source of starch, especially such as corn, potato, oats, rice, cassava, sorghum, barley or wheat. Hydrolysis products of the above-mentioned starches can also be used. The starch is preferably derived from potatoes.

[0123] The non - associative thickening polymer of the present invention can be a cellulose - based polymer that does not contain C 10 -C 30 aliphatic chains.

[0124] According to the present invention, the term "cellulose - based polymer" refers to any polysaccharide compound having in its structure a sequence of glucose residues linked together via β - 1,4 bonds; in addition to unsubstituted cellulose, cellulose derivatives can be anionic, cationic, amphoteric or non - ionic.

[0125] Thus, the cellulose - based polymers that can be used according to the present invention can be selected from unsubstituted cellulose (including those in microcrystalline form), and cellulose ethers.

[0126] Among these cellulose - based polymers, cellulose ethers, cellulose esters and cellulose ether esters are distinguished.

[0127] Cellulose esters are inorganic esters of cellulose (cellulose nitrate, cellulose sulfate, cellulose phosphate, etc.), organic cellulose esters (cellulose monoacetate, cellulose triacetate, cellulose 3 - aminopropionate, cellulose acetate butyrate, cellulose acetate propionate or cellulose acetate trimellitate, etc.), and mixed organic / inorganic esters of cellulose such as cellulose acetate butyrate sulfate and cellulose acetate propionate sulfate. Among cellulose ester ethers, hydroxypropyl methylcellulose phthalate and ethyl cellulose sulfate can be mentioned.

[0128] Among the non - ionic cellulose ethers that do not carry C 10 -C 30 aliphatic chains, that is, "non - associative" cellulose ethers, mention may be made of (C1 - C4) alkyl celluloses such as methylcellulose and ethylcellulose (e.g., Ethocel standard 100 Premium from Dow Chemical); (poly)hydroxy(C1 - C4) alkyl celluloses such as hydroxymethylcellulose, hydroxyethylcellulose (e.g., Natrosol 250HHR sold by Aqualon) and hydroxypropylcellulose (e.g., Klucel EF from Aqualon); mixed (poly)hydroxy(C1 - C4) alkyl(C1 - C4) alkyl celluloses such as hydroxypropyl methylcellulose (e.g., Methocel E4M from Dow Chemical), hydroxyethyl methylcellulose, hydroxyethyl ethylcellulose (e.g., Bermocoll E 481FQ from Akzo Nobel) and hydroxybutyl methylcellulose.

[0129] Among the anionic cellulose ethers without a fatty chain, mention may be made of (poly)carboxy(C1-C4)alkyl celluloses and their salts. By way of example, mention may be made of carboxymethyl cellulose, carboxymethyl methyl cellulose (e.g., Blanose 7M from Aqualon), and carboxymethyl hydroxyethyl cellulose and its sodium salt.

[0130] Among the cationic cellulose ethers without a fatty chain, mention may be made of cationic cellulose derivatives, such as cellulose copolymers or cellulose derivatives grafted with water-soluble quaternary ammonium monomers, and are particularly described in patent US 4,131,576, such as (poly)hydroxy(C1-C4)alkyl celluloses, for example, hydroxymethyl cellulose, hydroxyethyl cellulose, or hydroxypropyl cellulose grafted particularly with methacryloylethyltrimethylammonium, methacrylamidopropyltrimethylammonium, or dimethyldiallylammonium salts. Commercial products corresponding to this definition are more particularly those sold by National Starch under the names L 200 and H 100.

[0131] Among the non-associative thickening polymers without sugar units that can be used according to the present invention, mention may be made of crosslinked acrylic or methacrylic acid homopolymers or copolymers, crosslinked 2-acrylamido-2-methylpropane sulfonic acid homopolymers and their crosslinked acrylamide copolymers, ammonium acrylate homopolymers or copolymers of ammonium acrylate and acrylamide, either alone or as a mixture.

[0132] The first family of non-associative thickening polymers suitable for use is represented by crosslinked acrylic acid homopolymers.

[0133] Among homopolymers of this type, mention may be made of those crosslinked with allyl alcohol ethers of the sugar series, such as products sold by Noveon under the names Carbopol 980, 981, 954, 2984, and 5984 or products sold by 3VSA under the names Synthalen M and Synthalen K. These polymers have the INCI name carbomer.

[0134] The non-associative thickening polymer may also be a crosslinked (meth)acrylic acid copolymer, such as the polymer sold by Noveon under the name Aqua SF1.

[0135] The non-associative thickening polymer may be selected from crosslinked 2-acrylamido-2-methylpropane sulfonic acid homopolymers and their crosslinked acrylamide copolymers.

[0136] Among the partially or fully neutralized crosslinked copolymers of 2-acrylamido-2-methylpropane sulfonic acid and acrylamide, particular mention may be made of the product described in Example 1 of EP 503,853, and reference may be made to said document regarding these polymers.

[0137] The composition according to the invention may similarly comprise an ammonium acrylate homopolymer or a copolymer of ammonium acrylate and acrylamide as a non - associative thickening polymer.

[0138] As an example of an ammonium acrylate homopolymer, mention may be made of the product sold by Hoechst under the name Microsap PAS 5193. Among the copolymers of ammonium acrylate and acrylamide, mention may be made of the product sold by Hoechst under the name Bozepol C Nouveau or under the name PAS 5193. For the description and preparation of such compounds, reference may be made in particular to FR 2 416 723, US 2 798 053 and US 2 923 692.

[0139] Also usable are cationic thickening polymers of the acrylic acid type.

[0140] Among the thickening polymers, mention may also be made of associative polymers well - known to those skilled in the art and having in particular non - ionic, anionic, cationic or amphoteric properties (preferably anionic).

[0141] It should be understood that an "associative polymer" is a polymer capable of associating reversibly with each other or with other molecules in an aqueous medium.

[0142] Their chemical structure more particularly comprises at least one hydrophilic region and at least one hydrophobic region.

[0143] "Hydrophobic group" means a group or polymer having a saturated or unsaturated, straight - chain or branched hydrocarbon - based chain containing at least 10 carbon atoms, preferably 10 to 30 carbon atoms, particularly 12 to 30 carbon atoms, and more preferably 18 to 30 carbon atoms.

[0144] Preferably, the hydrocarbon - based group is derived from a monofunctional compound. For example, the hydrophobic group may be derived from a fatty alcohol such as stearyl alcohol, dodecyl alcohol or decyl alcohol. It may also denote a hydrocarbon - based polymer, such as polybutadiene.

[0145] Among the associative polymers of the anionic type, mention may be made of:

[0146] -(a) those comprising at least one hydrophilic unit and at least one aliphatic allyl ether unit, more particularly those whose hydrophilic unit is constituted by an ethylenically unsaturated anionic monomer, even more particularly by a vinyl carboxylic acid and most particularly by acrylic acid or methacrylic acid or a mixture thereof.

[0147] Among these anion - associating polymers, those which are particularly preferred according to the present invention are polymers formed from 20% to 60% by weight of acrylic acid and / or methacrylic acid, 5% to 60% by weight of lower alkyl (meth)acrylates, 2% to 50% by weight of aliphatic allyl ethers, and 0% to 1% by weight of a cross - linker, which is a well - known copolymerizable unsaturated polyene monomer such as diallyl phthalate, allyl (meth)acrylate, divinylbenzene, (poly)ethylene glycol dimethacrylate or methylene bisacrylamide.

[0148] Among the latter polymers, those which are most particularly preferred are cross - linked terpolymers of methacrylic acid, ethyl acrylate and polyethylene glycol (10 EO) stearyl ether (steareth - 10), in particular those sold by Ciba under the names Salcare SC and Salcare SC which are 30% aqueous emulsions of a cross - linked terpolymer of methacrylic acid, ethyl acrylate and allyl ether of steareth - 10 (40 / 50 / 10);

[0149] -(b) those comprising i) at least one hydrophilic unit of the unsaturated olefinic carboxylic acid type and ii) at least one hydrophobic unit of the type such as (C 10 -C 30 ) alkyl esters of unsaturated carboxylic acids etc.

[0150] The (C 10 -C 30 ) alkyl esters of unsaturated carboxylic acids which can be used in the present invention include, for example, lauryl acrylate, stearyl acrylate, decyl acrylate, isodecyl acrylate and dodecyl acrylate, and the corresponding methacrylates, lauryl methacrylate, stearyl methacrylate, decyl methacrylate, isodecyl methacrylate and dodecyl methacrylate.

[0151] For example, this type of anionic polymer is described and prepared according to patents US 3 915 921 and US 4 509 949.

[0152] Among this type of anion - associating polymers, those which will be used more particularly are those composed of 60% to 95% by weight of acrylic acid (hydrophilic unit), 4% to 40% by weight of C 10 -C 30 alkyl acrylate (hydrophobic unit), and 0% to 6% by weight of a polymerizable cross - linking monomer, or alternatively those composed of 96% to 98% by weight of acrylic acid (hydrophilic unit), 1% to 4% by weight of C 10 -C 30Those consisting of an alkyl ester (hydrophobic unit) and 0.1% to 0.6% by weight of a polymerizable crosslinking monomer, such as those described previously.

[0153] Among the polymers described above, the most particularly preferred polymers according to the present invention are those sold by Goodrich under the trade name Pemulen Pemulen Carbopol and even more preferably Pemulen products sold by SEPPIC under the name Coatex products sold.

[0154] Also mentionable is the acrylic acid / lauryl methacrylate / vinylpyrrolidone terpolymer sold by ISP under the name Acrylidone LM.

[0155] -(c) Maleic anhydride / C 30 -C 38 α-olefin / maleic acid alkyl ester terpolymer, such as the product sold by Newphase Technologies under the name Performa V product sold (maleic anhydride / C 30 -C 38 α-olefin / isopropyl maleate copolymer).

[0156] -(d) Acrylic acid terpolymer, comprising:

[0157] i) Approximately 20% to 70% by weight of an α,β-monoethylenically unsaturated carboxylic acid [A],

[0158] ii) Approximately 20% to 80% by weight of an α,β-monoethylenically unsaturated non-surfactant monomer other than [A],

[0159] iii) Approximately 0.5% to 60% by weight of a nonionic mono-carbamate, which is the reaction product of a mono-surfactant and a monoethylenically unsaturated monoisocyanate,

[0160] such as those described in patent application EP-A-0 173 109 and more particularly the terpolymer described in Example 3, namely the methacrylic acid / methyl acrylate / behenyl dimethyl-m-isopropenylbenzyl isocyanate ethoxylated (40 EO) terpolymer, as a 25% aqueous dispersion.

[0161] -(e) Copolymers which, among their monomers, include an α,β-monoethylenically unsaturated carboxylic acid and an ester of an α,β-monoethylenically unsaturated carboxylic acid with an oxyalkylene-substituted fatty alcohol.

[0162] Preferably, these compounds also include, as monomers, an ester of an α,β-monoethylenically unsaturated carboxylic acid and a C1-C4 alcohol.

[0163] Examples which may be mentioned of compounds of this type are Aculyn sold by Rohm and Haas Co. which is a terpolymer of methacrylic acid / ethyl acrylate / stearyl methacrylate with oxyalkylene; and also Aculyn 88, also sold by Rohm and Haas Co. Mention may also be made of the Novethix L-10 polymer sold by Lubrizol, which has the INCI name acrylate / behenyl methacrylate copolymer.

[0164] -(f) Amphiphilic polymers which include at least one ethylenically unsaturated monomer bearing a sulfonic acid group in free or partially or fully neutralized form and which include at least one hydrophobic moiety. These polymers may be crosslinked or non-crosslinked. They are preferably crosslinked.

[0165] Ethylenically unsaturated monomers bearing a sulfonic acid group are especially selected from vinylsulfonic acid, styrenesulfonic acid, (meth)acrylamido(C1-C 22 )alkylsulfonic acid, N-(C1-C 22 )alkyl(meth)acrylamido(C1-C 22 )alkylsulfonic acid such as undecylacrylamidomethanesulfonic acid and also their partially or fully neutralized forms.

[0166] More preferably, (meth)acrylamido(C1-C 22 )alkylsulfonic acids will be used, such as acrylamidomethanesulfonic acid, acrylamidoethanesulfonic acid, acrylamidopropanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, methacrylamido-2-methylpropanesulfonic acid, 2-acrylamido-n-butanesulfonic acid, 2-acrylamido-2,4,4-trimethylpentanesulfonic acid, 2-methacrylamidododecylsulfonic acid or 2-acrylamido-2,6-dimethyl-3-heptanesulfonic acid and also their partially or fully neutralized forms.

[0167] More particularly, 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and also its partially or fully neutralized forms are used.

[0168] Polymers of this family may especially be selected from those obtained by copolymerization with C6-C 22Random amphiphilic AMPS polymers modified by reaction with a primary monoalkylamine or a secondary dialkylamine, and those as described in patent application WO 00 / 31154 (which form part of the description). These polymers may also contain other ethylenically unsaturated hydrophilic monomers selected, for example, from (meth)acrylic acid, its β-substituted alkyl derivatives or its esters obtained with a monoalcohol or a mono- or polyalkylene glycol, (meth)acrylamide, vinylpyrrolidone, maleic anhydride, itaconic acid or maleic acid, or mixtures of these compounds.

[0169] Preferred polymers of this family are selected from amphiphilic copolymers of AMPS and at least one ethylenically unsaturated hydrophobic monomer.

[0170] These same copolymers may also contain one or more ethylenically unsaturated monomers not containing a fatty chain, such as (meth)acrylic acid, its β-substituted alkyl derivatives or its esters obtained with a monoalcohol or a mono- or polyalkylene glycol, (meth)acrylamide, vinylpyrrolidone, maleic anhydride, itaconic acid or maleic acid or mixtures of these compounds.

[0171] These copolymers are described in particular in patent application EP-A 750 899, patent US 5 089 578 and the following publications by Yotaro Morishima:

[0172] -Self-assembling amphiphilic polyelectrolytes and their nanostructures, Chinese Journal of Polymer Science, Vol. 18, No. 40, (2000), 323-336

[0173] -Micelle formation of random copolymers of sodium 2-(acrylamido)-2-methylpropanesulfonate and a nonionic surfactant macromonomer in water as studied by fluorescence and dynamic light scattering, Macromolecules, Vol. 33, No. 10, (2000), 3694-3704;

[0174] -Solution properties of micelle networks formed by non-ionic moieties covalently bound to an polyelectrolyte: salt effects on rheological behavior - Langmuir, Vol. 16, No. 12, (2000) 5324 - 5332;

[0175] -Stimuli responsive amphiphilic copolymers of sodium 2-(acrylamido)-2-methylpropanesulfonate and associative macromonomers, Polym. Preprint, Div. Polym. Chem. 40(2), (1999), 220 - 221.

[0176] Among these polymers, mention may be made of:

[0177] -Crosslinked or non-crosslinked, neutralized or non-neutralized copolymers comprising from 15% to 60% by weight of AMPS units and from 40% to 85% by weight of (C8 - C 16 ) alkyl (meth)acrylamide or (meth)acrylic acid (C8 - C 16 ) alkyl ester units, such as those described in patent application EP - A750 899;

[0178] -Terpolymers comprising from 10 mol% to 90 mol% of acrylamide units, from 0.1 mol% to 10 mol% of AMPS units and from 5 mol% to 80 mol% of n-(C6 - C 18 ) alkyl acrylamide units, such as those described in patent US - 5 089 578.

[0179] Also mention may be made of the completely neutralized copolymer of AMPS and dodecyl methacrylate, and also of crosslinked and non-crosslinked copolymers of AMPS and n-dodecyl methacrylamide, such as those described in the Morishima article mentioned above.

[0180] Among cationic associative polymers, mention may be made of:

[0181] (a) Cationic associative polyurethanes;

[0182] (b) A compound sold by Noveon under the name Aqua CC and corresponding to the INCI name Polyacrylate-1 Crosspolymer.

[0183] Polyacrylate-1 Crosspolymer is the polymerization product of a monomer mixture comprising:

[0184] - Di(C1-C4 alkyl)amino(C1-C6 alkyl) esters of methacrylic acid,

[0185] - One or more C1-C 30 alkyl esters of (meth)acrylic acid,

[0186] - Polyethoxylated C 10 -C 30 alkyl esters of methacrylic acid (20 - 25 mol of ethyleneoxy units),

[0187] - 30 / 5 poly(ethylene glycol) / poly(propylene glycol) allyl ether,

[0188] - Hydroxy(C2-C6 alkyl) esters of methacrylic acid, and

[0189] - Ethylene glycol dimethacrylate.

[0190] (c) Quaternized (poly)hydroxyethyl cellulose modified with a group containing at least one fatty chain, such as an alkyl, aralkyl or alkaryl group containing at least 8 carbon atoms or a mixture thereof. The alkyl groups carried by the above quaternized cellulose or hydroxyethyl cellulose preferably contain 8 to 30 carbon atoms. Aryl preferably denotes phenyl, benzyl, naphthyl or anthryl. Examples of quaternized alkyl hydroxyethyl celluloses containing C8-C 30 fatty chains include products sold by Aqualon such as Quatrisoft LM Quatrisoft LM-X 529-18- QuatrisoftLM-X 529-18- (C 12 alkyl) and Quatrisoft LM-X 529- (C 18 alkyl) and products sold by Croda such as Crodacel Crodacel (C 12 alkyl) and Crodacel (C 18 )(alkyl) and the product Softcat SL sold by Crosfield

[0191] (d) Cationic polyvinyl lactam polymers.

[0192] Such polymers are described, for example, in patent application WO-00 / 68282.

[0193] As the poly(vinyl lactam) polymer according to the invention, in particular, a terpolymer of vinylpyrrolidone / dimethylaminopropyl methacrylamide / ammonium lauryl dimethyl methylacrylamidopropyl tosylate, a terpolymer of vinylpyrrolidone / dimethylaminopropyl methacrylamide / cocoyl dimethyl methylacrylamidopropyl tosylate, a terpolymer of vinylpyrrolidone / dimethylaminopropyl methacrylamide / lauryl dimethyl methylacrylamidopropyl tosylate or ammonium chloride is used.

[0194] The amphoteric associative polymers are preferably selected from those containing at least one non-cyclic cationic unit. Even more particularly, preferred are those prepared from or containing 1 to 20 mol%, preferably 1.5 to 15 mol%, and even more particularly 1.5 to 6 mol% of a fatty chain monomer relative to the total molar amount of the monomers.

[0195] For example, the amphoteric associative polymers according to the invention are described and prepared in patent application WO 98 / 44012.

[0196] In the amphoteric associative polymers according to the invention, a terpolymer of acrylic acid / (meth)acrylamidopropyl trimethylammonium chloride / stearyl methacrylate is preferred.

[0197] The nonionic type associative polymers that can be used according to the invention are preferably selected from:

[0198] (a) Copolymers of vinylpyrrolidone and fatty chain hydrophobic monomers, among which, by way of example, may be mentioned:

[0199] - The product Antaron sold by ISP or Ganex (vinylpyrrolidone / hexadecene copolymer);

[0200] - The product Antaron sold by ISP or Ganex (vinylpyrrolidone / eicosene copolymer);

[0201] (b) Copolymers of methacrylic acid or acrylic C1-C6 alkyl esters and amphoteric monomers containing at least one fatty chain, such as the oxyethylated methyl acrylate / stearyl acrylate copolymer sold by Goldschmidt under the name Antil ;

[0202] (c) Copolymers of hydrophilic methacrylates or acrylates and hydrophobic monomers containing at least one fatty chain, such as polyethylene glycol methacrylate / lauryl methacrylate copolymer.

[0203] (d) Polyurethane polyethers, including both hydrophilic blocks (usually of polyoxyethylated nature) and hydrophobic blocks (which can be separate aliphatic sequences and / or cycloaliphatic and / or aromatic sequences) in their chains;

[0204] (e) Polymers having an aminoplast ether backbone containing at least one fatty chain, such as the Pure compounds sold by Sud-Chemie;

[0205] (f) Cellulose or its derivatives, modified with groups containing at least one fatty chain (such as alkyl, aralkyl or alkaryl or mixtures thereof), where the alkyl is C8, and in particular:

[0206] * Non-ionic alkyl hydroxyethyl cellulose, such as the products Natrosol Plus Grade 330 CS and Polysurf 67 (C 16 alkyl) sold by Aqualon;

[0207] * Non-ionic nonylphenol polyether-based hydroxyethyl cellulose, such as the product Amercell HM-1500 sold by Amerchol;

[0208] * Non-ionic alkyl cellulose, such as the product Bermocoll EHM 100 sold by Berol Nobel;

[0209] (g) Associative guar gum derivatives, such as hydroxypropyl guar gum modified with fatty chains, such as the product Esaflor HM 22 (modified with C 22 alkyl chains) sold by Lamberti; the product Miracare XC 95-3 (modified with C 14 alkyl chains) and the product RE 205-146 (modified with C 20 alkyl chains) sold by Rhodia Chimie.

[0210] Preferably, the polyurethane polyether comprises at least two hydrocarbon-based lipophilic chains containing from 6 to 30 carbon atoms and separated by hydrophilic blocks, which hydrocarbon chains may be side chains or chains at the ends of the hydrophilic blocks. In particular, one or more side chains may be envisaged. In addition, the polymer may comprise hydrocarbon chains at one or both ends of the hydrophilic block.

[0211] The polyurethane polyether may be multi-block, in particular in the form of triblocks. The hydrophobic blocks may be at each end of the chain (e.g., a triblock copolymer with a hydrophilic central block) or distributed at the ends and in the chain (e.g., a multi-block copolymer). These polymers may also be graft polymers or star polymers.

[0212] The aliphatic chain non-ionic polyurethane polyether may be a triblock copolymer, the hydrophilic block of which is a polyoxyethylenated chain containing from 50 to 1000 oxyethylene groups. The non-ionic polyurethane polyether contains urethane bonds between the hydrophilic blocks, whence the name.

[0213] By extension, the aliphatic chain non-ionic polyurethane polyether also includes those in which the hydrophilic block is linked to the lipophilic block via other chemical bonds.

[0214] As an example of a non-ionic aliphatic chain polyurethane polyether that can be used in the present invention, mention may also be made of Rheolate with urea functionality sold by Rheox or 208, 204 or 212, and also Acrysol RM

[0215] Mention may also be made of products from Akzo with C 12 -C 14 alkyl chains, Elfacos and products from Akzo with C 18 alkyl chains, Elfacos

[0216] Products from Rohm & Haas &Haas) with C 20 alkyl chains and urethane bonds, product DW provided at a solids content of 20% in water

[0217] Solutions or dispersions of these polymers may also be used, especially in water or in a water / alcohol medium. Examples of such polymers that may be mentioned include 255 sold by Rheox 255, 278 and 244. Products DW 1206F and DW 1206J sold by Rohm and Haas can also be used.

[0218] The polyurethane polyethers that can be used according to the present invention are in particular those described in the article by G. Fonnum, J. Bakke and Fk. Hansen - Colloid Polym. Sci. [Colloid Polymer Science], 271, 380 - 389 (1993).

[0219] Even more particularly preferably, a polyurethane polyether obtained by polycondensation of at least three compounds is used, the at least three compounds including (i) at least one polyethylene glycol containing 150 to 180 mol of ethylene oxide groups, (ii) stearyl alcohol or decanol, and (iii) at least one diisocyanate.

[0220] Such polyurethane polyethers are notably sold by Rohm and Haas under the names Aculyn and Aculyn [Aculyn is a condensate of polyethylene glycol containing 150 or 180 mol of ethylene oxide groups, stearyl alcohol and methylene bis(4 - cyclohexylisocyanate) (SMDI), at 15% by weight in a matrix of maltodextrin (4%) and water (81%); Aculyn is a condensate of polyethylene glycol containing 150 or 180 mol of ethylene oxide groups, decanol and methylene bis(4 - cyclohexylisocyanate) (SMDI), at 35% by weight in a mixture of propylene glycol (39%) and water (26%)].

[0221] Preferably, the composition comprises one or more thickening polymers, which are preferably selected from non - associative thickening polymers without sugar units, anionic associative thickening polymers (in particular anionic associative acrylic polymers), and mixtures thereof.

[0222] Preferably, when a thickening polymer is present in the composition according to the present invention, the total content of the thickening polymer is in the range of from 0.05% to 4% by weight, more preferably from 0.1% to 2% by weight, even more preferably from 0.2% to 1% by weight, and still better from 0.3% to 0.8% by weight relative to the total weight of the composition.

[0223] Additive

[0224] The composition may also optionally contain one or more additives other than the previously described compounds, such as those selected from: cations, anions, amphoteric or zwitterionic, nonionic surfactants and mixtures thereof, cationic, anionic, nonionic, amphoteric polymers or mixtures thereof, antidandruff agents, anti-seborrheic agents, vitamins and provitamins (including panthenol), sunscreens, chelating agents, plasticizers, solubilizers, acidifying agents, opacifiers or pearlescing agents, antioxidants, hydroxy acids, fragrances, preservatives and ceramides.

[0225] Needless to say, the person skilled in the art will carefully select such or these optional additional compounds such that the advantageous properties inherently associated with the composition according to the invention are not or are not substantially adversely affected by the envisaged additives.

[0226] The amount of each of the above additives present may generally be between 0% and 20% by weight relative to the total weight of the composition.

[0227] Method

[0228] The invention also relates to a method for the cosmetic treatment of human keratin materials, such as the skin, in particular the human scalp, hair and / or eyelashes, which method comprises at least the application of a cosmetic composition as defined above.

[0229] The composition according to the invention is preferably applied topically, in particular to the scalp and / or hair.

[0230] After application of the composition, rinsing may or may not be carried out after a possible dwell time.

[0231] Preferably, no rinsing is carried out after application of the composition according to the invention.

[0232] Preferably, the cosmetic treatment method is a method for caring for the hair and / or scalp.

[0233] The subject of the invention is also the use of a cosmetic composition as defined above for treating the loss of keratin fibers and / or promoting the regeneration of keratin fibers.

[0234] The subject of the invention is also the use of a cosmetic composition as defined above for increasing the diameter of keratin fibers and / or strengthening keratin fibers against breakage.

[0235] The following examples are intended to illustrate the invention, but are not restrictive in nature.

[0236] Examples

[0237] In the following examples, all amounts are given as mass percentages of active material (AM) relative to the total weight of the composition (unless otherwise mentioned).

[0238] a) Composition

[0239] Prepare compositions A to D according to the invention and comparative composition E using the ingredients whose contents are specified in the table below.

[0240] [Table 1]

[0241]

[0242] b) Scheme

[0243] Professional hairstylists conducted tests on consumers. The test enabled each consumer to test two formulations, with each product being applied to one half of the head.

[0244] On the first day, a shampoo wash was carried out to clean the scalp by removing any residues of products that the consumers might have applied previously. The entire head of hair and scalp was partially dried with a towel.

[0245] Then, 3 mL of the product was first applied to one half of the scalp. The scalp was observed. Then the scalp and hair were dried, and the scalp was observed again.

[0246] On the second day, the consumers' scalps were observed when they returned. Then, 3 mL of the product was applied a second time to the same half of the scalp. The scalp was observed.

[0247] Among the various parameters observed, the hairstylist would note powdering (the appearance of powder), and the hairstylist, being an expert in sensory properties, would judge whether the degree of powdering was acceptable or unacceptable.

[0248] c) Result

[0249] The results are presented in the table below.

[0250] [Table 2]

[0251] Composition First application, dry hair Return Second application Composition A No powdering No powdering No powdering Composition B No powdering No powdering No powdering Composition C No powdering No powdering No powdering Composition D No powdering No powdering No powdering Composition E Powdering Powdering Powdering

[0252] After drying the compositions according to the invention, compositions A to D according to the invention do not leave any powdery effect (presence of particles) on the scalp or hair.

[0253] The same results were observed after re - applying the composition after 24 h, or a very slight powdery effect was observed, which was judged acceptable by the hairstylist, who is an expert in scalp cleanliness.

[0254] Comparative composition E leaves a powdery effect on the scalp and hair.

Claims

1. A cosmetic composition, the cosmetic composition comprising: i) 2,4-diaminopyrimidine 3-N-oxide and / or its organic or inorganic acid salts and / or its hydrates, ii) piroctone olamine, iii) niacinamide, and iv) one or more hydroxylated compounds in an amount of at least 1% by weight relative to the total weight of the composition, said hydroxylated compounds having a melting point below 25 °C and a boiling point greater than or equal to 170 °C at atmospheric pressure (1.013×10 5 Pa), said hydroxylated compounds being preferably selected from hydroxylated compounds consisting of C2-C8 hydrocarbon chains optionally interrupted by an oxygen atom and containing one or two free hydroxyl groups (-OH) carried by different carbon atoms.

2. The composition according to the previous claim, characterized in that, The total content of 2,4-diaminopyrimidine 3-N-oxide and / or its organic or inorganic acid salts and / or its hydrates ranges from 0.05% to 8% by weight, preferably from 0.1% to 5% by weight, preferably from 0.2% to 4% by weight, more preferably from 0.5% to 3% by weight, and still better from 1% to 2% by weight, relative to the total weight of the composition.

3. The composition according to any one of the preceding claims, characterized in that, The total content of piroctone olamine ranges from 0.05% to 2% by weight, preferably from 0.1% to 1% by weight, preferably from 0.1% to 0.5% by weight, relative to the total weight of the composition.

4. The composition according to any one of the preceding claims, characterized in that, The total content of niacinamide ranges from 1% to 5% by weight, preferably from 2% to 5% by weight, relative to the total weight of the composition.

5. The composition according to any one of the preceding claims, characterized in that, The hydroxylated compound iv) is selected from straight-chain C2-C8 diols or aromatic C6-C8 monohydric alcohols and mixtures thereof, more preferably from straight-chain C2-C8, still better C2-C6 diols, and even more preferably propylene glycol.

6. The composition according to any one of the preceding claims, characterized in that, The total content of the hydroxylated compound iv) ranges from 1% to 15% by weight, preferably from 1.5% to 10% by weight, preferably from 2% to 8% by weight, more preferably from 2.1% to 6% by weight, still better from 2.2% to 5% by weight, and even still better from 2.3% to 4% by weight, relative to the total weight of the composition.

7. The composition according to any one of the preceding claims, characterized in that, The composition further comprises ginger root extract, the ginger root extract preferably in a total content ranging from 0.02% to 0.2% by weight, more preferably from 0.05% to 0.2% by weight, relative to the total weight of the composition.

8. The composition according to any one of the preceding claims, characterized in that, The composition further comprises one or more thickening polymers, the thickening polymers preferably selected from non-associative thickening polymers without sugar units, anionic associative thickening polymers, especially anionic associative acrylic polymers, and mixtures thereof.

9. A cosmetic method for treating human keratin materials, such as skin, especially the human scalp, hair, and / or eyelashes, the cosmetic method comprising applying to the keratin material a composition as described in any one of the preceding claims.

10. Use of a composition as described in any one of claims 1 to 8 for treating loss of keratin fibers and / or promoting regeneration of keratin fibers.

11. Use of a composition as described in any one of claims 1 to 8 for increasing the diameter of keratin fibers and / or strengthening keratin fibers to prevent breakage.

Images