Composition for keratin fiber

Abstract

To provide a composition for keratin fiber such as hair, capable of protecting or preserving the color of the dyed keratin fiber.SOLUTION: The present invention relates to a composition for keratin fiber, preferably hair, comprising (a) at least one dipeptide, (b) at least one hydroxy acid, and (c) water, wherein the level of (b) hydroxy acid is at least 0.1 mass% relative to the total mass of the composition. The inventive composition can endow the keratin fiber with a superior color protection effect.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a composition for keratinous fibers, preferably hair. [Background technology]

[0002] In the field of hair cosmetic treatments, consumers use hair cosmetics to impart conditioning benefits, such as smoothness, to the hair. To date, several hair products containing dipeptides have been reported.

[0003] For example, WO 2010 / 124817 discloses a conditioning composition for hair, comprising at least one hair conditioning agent and at least one dipeptide. Also, WO 2010 / 124818 discloses an aqueous cleansing composition for keratin fibers, particularly for human hair, with excellent conditioning effect, comprising at least one anionic surfactant, at least one nonionic surfactant, and at least one dipeptide containing two different amino acid moieties (wherein at least one of the amino acid moieties is glycine).

[0004] In conditioning for keratin fibers, such as colored hair, color retention of the keratin fibers is a very important property. There remains a need for cosmetic compositions for treating keratin fibers, particularly hair, that can impart improved color protection properties to colored keratin fibers, particularly colored hair. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] WO 2010 / 124817 [Patent Document 2] WO 2010 / 124818 Summary of the Invention [Problem to be solved by the invention]

[0006] It is an object of the present invention to provide a composition for keratinous fibers, such as hair, that is capable of protecting or preserving the color of colored keratinous fibers. [Means for solving the problem]

[0007] The above objectives are: (a) at least one dipeptide; (b) at least one hydroxy acid; (c) Water and A composition for keratin fibres, preferably hair, comprising: The amount of (b) hydroxy acid in the composition is at least 0.1% by weight based on the total weight of the composition; This can be achieved by the composition.

[0008] The amino acids constituting the dipeptide can be selected from arginine, tyrosine, valine, tryptophan, alanine, cysteine, glycine, lysine, proline, hydroxyproline and histidine.

[0009] The dipeptide may be selected from basic dipeptides.

[0010] The dipeptide may be carnosine.

[0011] The amount of the dipeptide in the composition may be in the range of 0.5% to 20% by mass, preferably 1% to 15% by mass, and more preferably 1.5% to 10% by mass, relative to the total mass of the composition.

[0012] The hydroxy acids may be selected from alpha-hydroxy acids.

[0013] The hydroxy acids may be selected from glycolic acid, lactic acid, malic acid, citric acid, tartaric acid, mandelic acid, gluconic acid, and mixtures thereof.

[0014] The hydroxy acid may be selected from lactic acid, citric acid, tartaric acid, and mixtures thereof.

[0015] The amount of hydroxy acid in the composition may be in the range of 0.2% to 50% by weight, preferably 0.3% to 40% by weight, more preferably 0.5% to 30% by weight, and specifically 0.8% to 25% by weight, relative to the total weight of the composition.

[0016] The composition may be of the rinse-off type.

[0017] The composition may have a pH value in the range of 1.5-8, preferably 1.8-7, more preferably 2-6.

[0018] The composition may be for treating, conditioning, cleansing and / or caring for keratinous fibers.

[0019] The present invention also relates to a cosmetic method for keratinous fibres, preferably hair, comprising the step of applying to the keratinous fibres a composition according to the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] After extensive investigation, the inventors have discovered that the combination of components of the present invention provides a composition for keratinous fibers, such as hair, that can exhibit improved color protection properties for colored keratinous fibers.

[0021] Therefore, the present invention provides (a) at least one dipeptide; (b) at least one hydroxy acid; (c) Water and A composition for keratin fibres, preferably hair, comprising: The amount of (b) hydroxy acid in the composition is at least 0.1% by weight based on the total weight of the composition; Primarily relates to composition.

[0022] The compositions according to the invention can be used for colored keratinous fibers, in particular for protecting and / or maintaining the color of colored keratinous fibers, resulting in improved color protection and / or maintenance benefits.

[0023] "Keratin fibres" as used herein include hair, eyebrows, eyelashes etc. It is preferred that the present invention is used for hair.

[0024] The expression "color protection of colored keratinous fibers" or "color retention of colored keratinous fibers" refers to the effect of protecting or retaining the color of keratinous fibers already imparted to the keratinous fibers by dyeing the keratinous fibers. Therefore, the expression "color protection of colored keratinous fibers" or "color retention of colored keratinous fibers" is also understood to be the effect of preventing fading or leaching of color from colored keratinous fibers. The composition according to the invention can also impart improved color retention to keratinous fibers.

[0025] The keratinous fibers to be treated with the composition according to the present invention may be colored by dyeing the keratinous fibers. The method of dyeing the keratinous fibers is not particularly limited, but typically the keratinous fibers are colored with an oxidative coloring precursor using an oxidative dye.

[0026] The composition according to the present invention can be preferably used as a cosmetic composition.In particular, the composition according to the present invention can be intended for application on keratin fibers such as hair.Therefore, the composition according to the present invention can be used for cosmetic methods for keratin fibers.In some embodiments of the present invention, the composition according to the present invention can be used to treat, condition, cleanse and / or care for keratin fibers, preferably hair.

[0027] The compositions according to the invention may be in any form, such as a solution, gel, lotion, serum, suspension, dispersion, fluid, milk, thickened or unthickened W / O or O / W emulsion, paste, foam or cream.

[0028] In one embodiment of the present invention, the composition according to the invention is a rinse-off or leave-on cosmetic composition. Rinse-off compositions are intended to be rinsed off after application on keratinous fibers. Leave-on cosmetic compositions are not intended to be washed / rinsed off or removed immediately after application.

[0029] Hereinafter, the present invention will be described in detail.

[0030] [Composition] One aspect of the present invention is (a) at least one dipeptide; (b) at least one hydroxy acid; (c) Water and The present invention relates to a composition for keratinous fibers, preferably hair, comprising

[0031] Each of the components is described in more detail below.

[0032] (Dipeptide) The composition according to the invention comprises at least one dipeptide. Two or more dipeptides may be used in combination. Thus, a single type of dipeptide or a combination of different types of dipeptides may be used.

[0033] The term "dipeptide" as used herein means a compound containing two amino acids joined by a peptide bond. The amino acids may be naturally occurring or chemically modified versions.

[0034] The amino acids constituting the dipeptide have at least one amino group and at least one carboxyl group. The amino group may be a primary amino group, a secondary amino group or a tertiary amino group.

[0035] The amino acids may be in the D or L configuration.

[0036] The amino acid can be selected from acidic amino acids, basic amino acids, neutral amino acids, or mixtures thereof. An acidic amino acid typically has one amino group and two carboxyl groups. A basic amino acid typically has two amino groups and one carboxyl group. Basic amino acids can include arginine, lysine, histidine, and ornithine. The number of amino groups and the number of carboxyl groups in a neutral amino acid are the same. Neutral amino acids can include glycine, alanine, valine, leucine, isoleucine, serine, threonine, cysteine, methionine, asparagine, glutamine, proline, phenylalanine, tyrosine, and tryptophan.

[0037] In some preferred embodiments, the amino acids constituting the dipeptide can be selected from basic amino acids and mixtures thereof. In other words, the amino acids can include at least one basic amino acid, such as arginine, lysine, histidine, ornithine, and preferably histidine.

[0038] In a further preferred embodiment, the dipeptide of the invention is selected from basic dipeptides formed from at least one basic amino acid. The term "basic dipeptide" as used herein means a dipeptide that contains at least one moiety derived from a basic amino acid and therefore exhibits basic properties.

[0039] The amino acids may be selected from α-amino acids, β-amino acids, γ-amino acids and δ-amino acids. The α-amino acids may be selected from non-cyclic α-amino acids and cyclic α-amino acids. The non-cyclic α-amino acids may be selected from the group consisting of alanine, arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine and valine. The cyclic α-amino acids may be selected from non-aromatic cyclic α-amino acids, such as pyrrolidone carboxylic acid (pyroglutamic acid or pyroic acid). Pyrrolidone carboxylic acid may be formed by intermolecular condensation of the amino and carboxyl groups of glutamic acid.

[0040] In some embodiments, the amino acid can be selected from amino acid derivatives, where the hydrogen atom on the nitrogen atom of the amino group in the amino acid is replaced with at least one substituent.

[0041] Examples of substituents that may be mentioned are alkyl, acyl, alkenyl, alkoxyl and alkoxycarbonyl groups.

[0042] The alkyl group may be a linear, branched or cyclic alkyl group. The alkyl group may be a linear or branched C1-C6 alkyl group, preferably a C1-C4 alkyl group, such as methyl, ethyl, propyl, i-propyl and butyl. Alternatively, the alkyl group may be a cyclic C3-C6 alkyl group, such as cyclopentyl and cyclohexyl.

[0043] The acyl group may be a C1-C6 acyl group, such as a formyl group and an acetyl group.

[0044] The alkenyl group may be a C2-C6 alkenyl group, such as a vinyl group, an allyl group, a butylene group, a pentenyl group, and a hexenyl group.

[0045] The alkoxy group may be a C1-C6 alkoxy group, such as a methoxy group, an ethoxy group, and a propoxy group.

[0046] The alkoxycarbonyl group may be a C1-C6 alkoxycarbonyl group, such as a methoxycarbonyl group, an ethoxycarbonyl group, and a propoxycarbonyl group.

[0047] The above substituents may be further substituted with at least one group such as a halogen atom, an amino group, a nitro group, a cyano group, a hydroxyl group, and an aromatic group such as a phenyl group.

[0048] In one embodiment, the amino acid may be selected from a salt of an amino acid or a salt of an amino acid derivative.

[0049] The type of salt of amino acid or amino acid derivative is not limited. The salt may be an acid salt or a basic salt. Acid salts include, for example, inorganic acid salts such as hydrochloride, sulfate, nitrate and phosphate, and organic acid salts such as citrate, oxalate, acetate, formate, maleate and tartrate. Basic salts include, for example, inorganic base salts such as sodium salt, potassium salt, calcium salt, magnesium salt, copper salt, zinc salt, aluminum salt and ammonium salt, and organic base salts such as triethylammonium salt, triethanolammonium salt, pyridinium salt and diisopropylammonium salt.

[0050] The dipeptide according to the invention may be composed of two of the same amino acids or two of different amino acids. In one embodiment of the invention, the two amino acids constituting the dipeptide are different amino acids.

[0051] In yet another embodiment of the present invention, the dipeptide is selected from imidazole dipeptides. The term "imidazole dipeptide" as used herein means a dipeptide in which one of the amino acids constituting the dipeptide is histidine. In other words, the dipeptide contains at least one histidine as an amino acid constituting the dipeptide.

[0052] Imidazole dipeptides that may be mentioned are carnosine, anserine and balenine. Carnosine is a dipeptide composed of alanine and histidine. Carnosine may be L-carnosine or D-carnosine. Anserine, also known as β-alanyl-N-methylhistidine, is a dipeptide composed of β-alanine and N-methylated histidine (i.e. histidine in which one nitrogen atom in the imidazole ring is methylated). Balenine, also known as β-alanyl-1-methyl-L-histidine, is a dipeptide composed of β-alanine and 3-methylhistidine.

[0053] Non-limiting examples of suitable dipeptides are those commercially available and known by their INCI names dipeptide-1, dipeptide-2, dipeptide-3, dipeptide-4, dipeptide-5, dipeptide-6, dipeptide-7, dipeptide-8, and carnosine. Preferred is carnosine, which is β-alanine and L-histidine.

[0054] In one preferred embodiment of the invention, the dipeptide is carnosine.

[0055] The amount of dipeptide in the composition according to the invention may be at least 0.5% by weight, preferably at least 1% by weight, more preferably at least 1.5% by weight, relative to the total weight of the composition.

[0056] The amount of dipeptide in the composition according to the invention may be up to 20% by weight, preferably up to 15% by weight, more preferably up to 10% by weight, relative to the total weight of the composition.

[0057] The composition according to the present invention may contain the dipeptide in an amount of 0.5% to 20% by mass, preferably 1% to 15% by mass, and more preferably 1.5% to 10% by mass, based on the total mass of the composition.

[0058] In the context of this specification, any combination of the above upper and lower values ​​may be used to express a preferred range of amounts.

[0059] (Hydroxy acid) The composition according to the present invention comprises (b) at least one hydroxy acid. Two or more hydroxy acids may be used in combination. Thus, a single type of hydroxy acid or a combination of different types of hydroxy acids may be used.

[0060] The hydroxy acid may comprise at least one mono- or polycarboxylic acid comprising at least one hydroxyl functional group. The hydroxy acid may be selected from α-hydroxy acids and β-hydroxy acids. For example, the at least one hydroxy acid may be an α-hydroxy acid. The α- and β-positions reflect the fact that at least one of the hydroxyl functional groups occupies the α- or β-position relative to at least one of the carboxyl functional groups of the acid, i.e., is either attached to the carbon bearing the carboxyl functional group or is attached to the carbon adjacent to the carbon bearing the carboxyl functional group, respectively. The acid may be present in a form selected from the free acid, its associated salts (e.g., salts with organic bases and alkali metals), and optionally the corresponding lactide (i.e., the form obtained by self-esterification of multiple molecules), depending, for example, on the final pH to be provided to the composition.

[0061] - AHA The composition according to the invention may comprise, as hydroxy acid, at least one alpha-hydroxy acid (AHA). If two or more alpha-hydroxy acids are used, they may be the same or different.

[0062] The term "alpha-hydroxy acid" or "AHA" as used herein means a carboxylic acid having at least one hydroxyl group on adjacent (alpha) carbon atoms.

[0063] Alpha-hydroxy acids have the chemical formula: (R a )(R b )C(OH)COOH (In the formula, R a and R b is H, F, Cl, Br, I, alkyl, aralkyl or aryl radicals having 1 to 25 carbon atoms in saturated or unsaturated, isomeric or non-isomeric, linear or branched or cyclic form, and in addition R a and R b may contain OH, CHO, COOH, and alkoxyl groups having 1 to 9 carbon atoms. It can be expressed as:

[0064] The hydrogen atoms attached to the carbon atoms may be replaced by F, Cl, Br, I, or lower alkyl, aralkyl, aryl, or alkoxyl groups having 1 to 9 carbon atoms. The alpha hydroxy acids may exist in the free acid or lactone form, or in the form of a partial salt with an organic base or inorganic alkali. The alpha hydroxy acids may exist as stereoisomers, such as D-, L-, DL-, and meso-isomers.

[0065] R a and R b are alkyl, they are independently C1-C5, C6-C 10 , C 11 ~C 15 , C 16 ~C 20 , C 21 ~C 25 and C 26 ~C 29 Thus, the compounds in the above formula can be any of the groups R a and R bIncludes all possible combinations of C1~C 12 R independently selected from a and R b Included within the foregoing is a subgenus of compounds having the formula:

[0066] R a and R b With respect to, typical alkyl, aralkyl, aryl and alkoxyl groups include methyl, ethyl, propyl, isopropyl, butyl, pentyl, octyl, lauryl, stearyl, benzyl, phenyl, methoxyl and ethoxyl.

[0067] The first group of alpha hydroxy acids are (1) alkyl alpha hydroxy acids, (2) aralkyl and aryl alpha hydroxy acids, (3) polyhydroxy alpha hydroxy acids, (4) polycarboxy alpha hydroxy acids, and (5) Various alpha hydroxy acids can be further divided into:

[0068] Representative alpha hydroxy acids in each subgroup are: (1) Alkyl alpha hydroxy acids: 2-hydroxyethanoic acid (glycolic acid), 2-hydroxypropanoic acid (lactic acid), 2-methyl 2-hydroxypropanoic acid (methyllactic 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-hydroxyeicosanoic acid (alpha hydroxyarachidonic acid), 2-hydroxytetraeicosanoic acid (cerebronic acid), 2-hydroxyeicosenoic acid (alpha hydroxynervonic acid), and 2,4-dihydroxy-3,3-dimethylbutanoic acid (pantoic acid). (2) Aralkyl and aryl alpha hydroxy acids: 2-phenyl 2-hydroxyethanoic acid (mandelic acid), 2,2-diphenyl 2-hydroxyethanoic acid (benzilic acid), 3-phenyl 2-hydroxypropanoic acid (phenyllactic acid), 2-phenyl 2-methyl 2-hydroxyethanoic acid (atrolactic acid), and 4-hydroxymandelic acid. (3) Polyhydroxy alpha hydroxy acids: 2,3-dihydroxypropanoic acid (glyceric acid), 2,3,4-trihydroxybutanoic acid (isomers, erythronic acid, threonic acid), 2,3,4,5-tetrahydroxypentanoic acid (isomers, ribonic acid, arabinonic acid, xylonic acid, lyxonic acid), 2,3,4,5,6-pentahydroxyhexanoic acid (isomers, allonic acid, altronic acid, gluconic acid, mannonic acid, gulonic acid, idonic acid, galactonic acid, talonic acid), 2,3,4,5,6,7-hexahydroxyheptanoic acid (isomers, glucoheptonic acid, galactoheptonic acid, mannoheptonic acid, etc.) (4) Polycarboxy alpha hydroxy acids: 2-hydroxypropane-1,3-dioic acid (tartronic acid), 2-hydroxybutane-1,4-dioic acid (malic acid), 2-hydroxy-2-methylbutane-1,4-dioic acid (citramalic acid), 2,3-dihydroxybutane-1,4-dioic acid (tartaric acid), 2,3,4-trihydroxypentane-1,5-dioic acid (isomers, ribalic acid, arabalic acid, xylaric acid, lixaric acid), 2,3,4,5-tetrahydroxyhexane-1,6-dioic acid (isomers, glucaric acid). Acid, galactaric acid, mannaric acid, allaric acid, altraric acid, glular acid, idaric acid, thalaric acid), 2-hydroxy-1,2,3-propanetricarboxylic acid (citric acid), 1-hydroxy-1,2,3-propanetricarboxylic acid (isocitric acid), 1-hydroxy-1,2,4-butanetricarboxylic acid (homoisocitric acid), 2-hydroxy-3-hexadecyl-1,2,3-propanetricarboxylic acid (n-hexadecyl citric acid, agaric acid) (5) Various alpha hydroxy acids: glyceruronic acid, erythruronic acid, treuronic acid, 2,3,4-trihydroxypentanuronic acid (isomers: ribulonic acid, arabinuronic acid, xyluronic acid, lyxuronic acid), 2,3,4,5-tetrahydroxyhexanuronic acid (isomers: aruronic acid, altoluronic acid, glucuronic acid, mannuronic acid, guluronic acid, iduronic acid, galacturonic acid, taluronic acid), 2,3,4,5,6-pentahydroxyheptanuronic acid (isomers: alloheptanuronic acid, altroheptanuronic acid, glucoheptanuronic acid, mannoheptanuronic acid, glucoheptanuronic acid, idoheptanuronic acid, galactoheptanuronic acid, taloheptanuronic acid).

[0069] The hydroxy acid may, for example, be selected from the group consisting of glycolic acid, lactic acid, malic acid, citric acid, tartaric acid, mandelic acid, gluconic acid, and mixtures thereof, preferably from the group consisting of glycolic acid, lactic acid, citric acid, tartaric acid, and mixtures thereof, more preferably from the group consisting of lactic acid, citric acid, tartaric acid, and mixtures thereof.

[0070] - BHA The composition according to the invention may comprise, as hydroxy acid, at least one beta-hydroxy acid (BHA). If two or more beta-hydroxy acids are used, they may be the same or different.

[0071] The term "beta-hydroxy acid" or "BHA" as used herein means a carboxylic acid having at least one hydroxyl group on the beta carbon atom.

[0072] β-hydroxy acids can include, but are not limited to, salicylic acid and its derivatives, specifically those of formula (I):

[0073] [ka]

[0074] [In the formula, R1 is a hydroxyl group or a group of the formula: -O-CO-R4 wherein R4 is a saturated or unsaturated aliphatic group containing 1 to 26 carbon atoms, preferably 1 to 18 carbon atoms, or an amine or thiol functional group optionally substituted with an alkyl group containing 1 to 18 carbon atoms, preferably 1 to 12 carbon atoms. represents an ester of R2 and R3 are each independently located at the 3-, 4-, 5-, or 6-position on the benzene ring and each independently represent a hydrogen atom or a group: -(O) n -(CO) m -R5 wherein n and m are, independently of one another, integers each equal to 0 or 1. However, R2 and R3 cannot simultaneously be hydrogen atoms. R5 represents a hydrogen atom, a linear, branched or cyclic saturated aliphatic group containing 1 to 18 carbon atoms, or an unsaturated group containing 3 to 18 carbon atoms and having 1 to 9 conjugated or non-conjugated double bonds, which may be substituted with at least one substituent selected from a halogen atom (fluorine, chlorine, bromine or iodine), a trifluoromethyl group, a hydroxyl in free form or esterified with an acid containing 1 to 6 carbon atoms, or a carboxyl in free form or esterified with a lower alcohol containing 1 to 6 carbon atoms. or an alkylated derivative thereof or a salt of such a derivative.

[0075] The salicylic acid derivative of formula (I) is preferably such that R1 represents a hydroxyl group, R2 represents a hydrogen atom and R3 is in the 5-position of the benzene ring and represents a -CO-R5 group, where R5 represents a saturated aliphatic group containing from 3 to 15 carbon atoms.

[0076] According to a preferred embodiment of the invention, the salicylic acid derivative of formula (I) is selected from 5-n-octanoylsalicylic acid, 5-n-decanoylsalicylic acid, 5-n-dodecanoylsalicylic acid, 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-propanoylsalicylic acid, 5-n-hexadecanoylsalicylic acid, 5-n-oleoylsalicylic acid, 5-benzoylsalicylic acid, their monovalent and divalent salts, and mixtures thereof. It is more specifically 5-n-octanoyl salicylic acid (INCI: capryloyl salicylic acid).

[0077] The hydroxy acids are preferably selected from α-hydroxy acids, for example from the group consisting of glycolic acid, lactic acid, malic acid, citric acid, tartaric acid, mandelic acid, gluconic acid, and mixtures thereof, preferably from the group consisting of glycolic acid, lactic acid, citric acid, tartaric acid, and mixtures thereof, more preferably from the group consisting of lactic acid, citric acid, tartaric acid, and mixtures thereof.

[0078] The amount of (b) hydroxy acid in the composition is at least 0.1% by weight, based on the total weight of the composition.

[0079] The hydroxyacid may be present in the composition according to the invention in an amount of at least 0.2% by weight, preferably at least 0.3% by weight, more preferably at least 0.5% by weight and in particular at least 0.8% by weight, relative to the total weight of the composition.

[0080] The hydroxy acids may be present in the composition according to the invention in an amount of less than or equal to 50% by weight, preferably less than or equal to 40% by weight, more preferably less than or equal to 30% by weight and in particular less than or equal to 25% by weight relative to the total weight of the composition.

[0081] The hydroxy acid may be present in the composition according to the invention in an amount ranging from 0.2% to 50% by weight, preferably from 0.3% to 40% by weight, more preferably from 0.5% to 30% by weight and particularly from 0.8% to 25% by weight, relative to the total weight of the composition.

[0082] (water) The composition according to the present invention comprises water.

[0083] The amount of water in the composition according to the invention may be at least 50% by weight, preferably at least 60% by weight, more preferably at least 65% by weight, relative to the total weight of the composition.

[0084] The amount of water in the composition according to the invention may be up to 99.5% by weight, preferably up to 99% by weight, more preferably up to 98% by weight, relative to the total weight of the composition.

[0085] The amount of water in the composition according to the present invention may be 30% by mass to 99.5% by mass, preferably 50% by mass to 99% by mass, and more preferably 65% ​​by mass to 98% by mass, based on the total mass of the composition.

[0086] (Other optional additives) The compositions according to the invention may also comprise any other optional additives normally used in the cosmetic field, for example chosen from anionic, cationic, amphoteric or nonionic surfactants, anionic, cationic, amphoteric or nonionic polymers, oils, cosmetically acceptable hydrophilic organic solvents, gums, resins, hydrophilic thickeners, hydrophobic thickeners, dispersants, antioxidants, film-forming agents, preservatives such as phenoxyethanol, fragrances, neutralizing agents, cosmetic active agents, moisturizers, emollients, and mixtures thereof.

[0087] It is routine for a person skilled in the art to adjust the nature and amounts of the abovementioned optional additives which may be present in the composition according to the invention so that the desired cosmetic properties are not affected by said additives.

[0088] In some embodiments, the oil may be present in the composition of the present invention in an amount ranging from 0% to 50% by weight, preferably from 0% to 40% by weight, or from 0% to 30% by weight, relative to the total weight of the composition.

[0089] In this specification, "oil" means a fatty compound or substance that is in the form of a liquid or paste (non-solid) at atmospheric pressure (760 mmHg) and at room temperature (25°C). As oils, those commonly used in cosmetics can be used, either alone or in combination. These oils can be volatile or non-volatile.

[0090] The oils may include volatile or non-volatile oils, which may in particular be hydrocarbon-based oils of animal or vegetable origin, synthetic oils, silicone oils, fluoro oils, or mixtures thereof. The oils may be chosen from ester oils, fatty alcohols, and combinations thereof.

[0091] For the purposes of the present invention, "hydrocarbon-based oil" or "hydrocarbon oil" is intended to mean an oil that contains mainly hydrogen and carbon atoms, and optionally oxygen, nitrogen, sulfur and / or phosphorus atoms. Hydrocarbon-based oils do not contain any silicon atoms.

[0092] For the purposes of the present invention, "silicone oil" is intended to mean an oil containing at least one silicon atom and in particular at least one Si-O group, such as dimethicone.

[0093] The pH of the composition according to the present invention may generally be, for example, 1.5 to 8, preferably 1.8 to 7, more preferably 2 to 6, and even more preferably 2 to 5.

[0094] The composition according to the present invention can be prepared by mixing the essential components described above and, if necessary, the optional components described above.

[0095] The method and means for mixing the above essential components and optional components are not limited. Any conventional method and means can be used to mix the above essential components and optional components to prepare the composition according to the present invention.

[0096] [Beauty method] The present invention also relates to a cosmetic method for keratinous fibres, preferably hair, comprising the step of applying to the keratinous fibres a composition according to the invention.

[0097] The cosmetic method of the invention may be a cosmetic method for treating, conditioning, cleansing and / or caring for keratinous fibers, preferably hair.

[0098] The composition according to the invention may be rinsed off after the keratinous fibers have been treated with said composition. Thus, in one embodiment of the invention, the method according to the invention may comprise the additional step of rinsing the composition from the keratinous fibers.

[0099] The method according to the invention can be used for coloured keratinous fibres, in particular for protecting or preserving the colour of coloured keratinous fibres, during the treatment, conditioning, cleansing and / or care of the keratinous fibres.

[0100] Therefore, as an embodiment (I) of a cosmetic method, the present invention provides: (i) applying a composition according to the invention to keratinous fibres; (ii) optionally rinsing the composition from the keratinous fibers; The present invention relates to a cosmetic method for keratin fibers, preferably hair, comprising:

[0101] Unless otherwise indicated, the same explanations for the composition comprising (a) at least one dipeptide, (b) at least one hydroxy acid, and (c) water can be applied to the method according to the invention. The composition used in the method according to the invention can include any of the optional additives described above for the composition according to the invention. EXAMPLES

[0102] The present invention will now be described in more detail by way of examples. However, these examples should not be construed as limiting the scope of the present invention.

[0103] (Examples 1 to 9 and Comparative Example 1) [Preparation] Each of the hair compositions according to Examples 1-9 (Ex.1-Ex.9) and Comparative Example 1 (Comp. Ex.1) was prepared under ambient conditions by mixing the ingredients until it was homogeneous. The respective loading ratios of the compositions are shown in Table 3 and Table 4. Carnosine was obtained from Symrise. All values ​​of the amounts of the ingredients are based on "mass %" of the active ingredient.

[0104] [evaluation] A Chinese 100% grey hair tress (1 g, 10 cm) was placed on a hot plate at 30° C. A reducing agent (PREMIA WAVE, L'Oreal Professionnel) was applied onto the tress (2 g / g hair), which was then covered with vinyl wrap. The tress was left on the hot plate for 15 minutes, after which the vinyl wrap was removed, and the tress was then rinsed with tap water at 37° C., followed by towel drying. An oxidizing agent (PREMIA WAVE, L'Oreal Professionnel) was applied onto the tress (2 g / g hair), which was left for 10 minutes, followed by rinsing with tap water at 37° C., followed by towel drying and blow drying to obtain a permed hair tress.

[0105] The resulting permed hair tresses were placed on a hot plate at 27°C. A mixture of a color product (Majirel Majirouge Carmilane 6.66 Dark Red Blonde, L'Oreal Professionnel) and an oxidant product (Oxidant Creme 6% 20 vol., L'Oreal Professionnel) in a mass ratio of 1:1.5 was applied onto the tresses (3 g mixture / g hair), which were left for 35 minutes, then rinsed with tap water at 37°C, then washed with plain shampoo, then towel-dried and blow-dried to obtain permed and colored hair tresses. The formulation ratios of the plain shampoos used in the coloring procedure are shown in Table 1 below. All numerical values ​​of the amounts of ingredients are based on the "mass %" of the active ingredients.

[0106] [Table 1]

[0107] The resulting permed and colored hair tresses (1 g, 10 cm) were placed on a hot plate at 27°C. Each of the compositions according to Examples 1-9 and Comparative Example 1 was applied equally onto the tresses in an amount of 1 g / g of hair, which was then wrapped in vinyl wrap. The tresses were left on the hot plate for 30 minutes, after which the vinyl wrap was removed. After squeezing to remove excess composition, each tress was rinsed with tap water at 37°C. Each tress was then washed with a 1 wt% solution of plain shampoo (in an amount of 90 g / g of hair) for 5 minutes at 1340 rpm, then rinsed with tap water at 37°C and blow-dried. The formulation ratios of the plain shampoo used in the color fade analysis are shown in Table 2 below. All numerical values ​​of the amounts of ingredients are based on the "mass %" of active ingredients.

[0108] [Table 2]

[0109] The difference in fading of the color of the permed and colored strands before and after shampooing was measured using a Konica Minolta Spectrophotometer CM-3600A to measure the colorimetric value (L * , a * , b * , brightness / green-red / blue-yellow). * Value (ΔL * a * b) Between the bundles before and after treatment of the coloring method under the system was calculated. ΔE * The value is expressed as:

[0110]

number

[0111] (In the formula, L0, a0, and b0 are values ​​before the composition is applied, and L1, a1, and b1 are values ​​after the composition is applied.) Calculated using ΔE * shows better color protection.

[0112] [Table 3]

[0113] [Table 4]

[0114] As can be seen from Tables 3 and 4, the compositions according to Examples 1 to 9 containing specific combinations of components (a) to (c) of the present invention exhibited low ΔE * can be achieved, which means that they can prevent the leaching of dyes from the colored keratin fibers and can provide improved color protection effects to the colored keratin fibers.

[0115] On the other hand, (b) the composition according to Comparative Example 1, which did not contain a sufficient amount of hydroxy acid, showed a higher ΔE*, indicating that it had poor color protection.

[0116] Accordingly, it can be concluded that the composition according to the invention is highly suitable for treating colored keratin fibers, since it is able to exhibit an improved color-protecting effect.

Claims

1. (a) at least one dipeptide; (b) at least one hydroxy acid; (c) Water and A composition for keratin fibers comprising: (b) the amount of hydroxy acid is at least 0.1% by weight, based on the total weight of the composition; composition.

2. 2. The composition according to claim 1, wherein the amino acids constituting the dipeptide are selected from arginine, tyrosine, valine, tryptophan, alanine, cysteine, glycine, lysine, proline, hydroxyproline, and histidine.

3. 2. The composition of claim 1, wherein the dipeptide is selected from basic dipeptides.

4. 2. The composition of claim 1, wherein the dipeptide is carnosine.

5. 2. The composition according to claim 1, wherein the amount of dipeptide ranges from 0.5% to 20% by weight relative to the total weight of the composition.

6. The composition of claim 1, wherein the hydroxy acid is selected from alpha-hydroxy acids.

7. 10. The composition of claim 1, wherein the hydroxy acid is selected from glycolic acid, lactic acid, malic acid, citric acid, tartaric acid, mandelic acid, gluconic acid, and mixtures thereof.

8. 10. The composition of claim 1, wherein the hydroxy acid is selected from lactic acid, citric acid, tartaric acid, and mixtures thereof.

9. 2. The composition according to claim 1, wherein the amount of hydroxy acid ranges from 0.2% to 50% by weight, relative to the total weight of the composition.

10. 10. The composition of claim 1, which is a rinse-off type.

11. 10. The composition of claim 1, having a pH value in the range of 1.5 to 8.

12. 10. The composition according to claim 1, for treating, conditioning, cleansing and / or caring for keratinous fibers.

13. A cosmetic method for keratinous fibers, comprising the step of applying a composition according to any one of claims 1 to 12 to the keratinous fibers.