Hair care composition for improving color fastness of dyed hair

Abstract

The present invention relates to hair care compositions comprising a specific mixture of branched and straight-chain saturated C15-C19 alkanes, esters of fatty acids with dextrin, and a cationic emulsifier, which have been shown to provide significant improvements in color fastness of dyed hair.

Description

Detailed Description of the Invention

[0001] [Technical field] The present invention relates to the field of cosmetic compositions, in particular cosmetic compositions for the care of dyed hair.

[0002] [Background of the invention] Hair coloring is a specific area of the cosmetics field. Hair coloring is a common procedure, especially among women, and is performed using hair dyes.

[0003] Hair dyes are classified according to their color resistance: temporary, semi-permanent, semi-permanent, and permanent. The first two classifications are based on pre-colored molecules. Temporary dyes work by dye deposition in the cuticle, while semi-permanent dyes penetrate slightly into the cortex, resulting in colors that typically last for up to six washes. Semi-permanent and permanent hair dyes are based on color precursors called oxidation dyes, which form the final shade through interaction with an oxidizing agent, which differs from the alkalizing agent used. Oxidative systems allow molecules to diffuse strongly into the cortex, promoting long-term color resistance.

[0004] Washing hair, especially with shampoo, can cause the color to fade. Semi-permanent hair dyes typically fade after 4-6 shampoos. Due to chemical fixation, permanent dyes last significantly longer against water and shampoo, but even permanent hair dye color resistance is not perfect.

[0005] Increasing the colorfastness of hair dyes is highly desirable in the market for hair care products used in the hair color field, as customers desire to maintain consistent hair color and appearance over time.

[0006] [Summary of the Invention] The problem that the present invention aims to solve is therefore to provide a product that improves the color fastness of dyed hair.

[0007] Surprisingly, it has been found that this problem can be solved by a hair care composition according to claim 1.

[0008] It has been observed that when dyed hair is treated with a hair composition containing a specific mixture of branched and straight-chain saturated C15-C19 alkanes, esters of fatty acids and dextrin, and a cationic emulsifier, the color of the dyed hair lasts much longer, resistant to the undesirable effects of shampoo and water fading.

[0009] Further aspects of the invention are the subject matter of further independent claims. Particularly preferred embodiments are the subject matter of the dependent claims.

[0010] [Detailed Description of the Invention] In a first aspect, the present invention provides a method for producing a medicament for the treatment of a pulmonary arthritis, comprising: - a mixture of branched and linear saturated C15-C19 alkanes; - esters of fatty acids with dextrin; - Cationic emulsifiers and wherein the amount of branched saturated C15 to C19 alkane in said mixture of branched and linear saturated C15 to C19 alkanes is greater than 80% by weight, preferably greater than 90% by weight, most preferably greater than 92% by weight, based on the weight of said mixture of branched and linear saturated C15 to C19 alkanes.

[0011] In this specification, "C x~y An "alkyl" group is an alkyl group containing x to y carbon atoms, i.e., for example, C 1~3 An alkyl group is an alkyl group containing 1 to 3 carbon atoms. An alkyl group can be straight or branched. For example, -CH(CH3)-CH2-CH3 is considered a C4 alkyl group.

[0012] In this specification, when the same symbol appears for a symbol or group in several formulas, the definition of said group or symbol given in relation to one particular formula also applies to other formulas containing the same symbol.

[0013] The term "UV filter" as used herein refers to a substance that absorbs ultraviolet light (UV light), i.e., electromagnetic radiation with a wavelength of 280 to 400 nm. A UV(A) filter is a UV filter that absorbs UV(A) light, i.e., electromagnetic radiation with a wavelength of 315 to 400 nm. A UV(B) filter is a UV filter that absorbs UV(B) light, i.e., electromagnetic radiation with a wavelength of 280 to 315 nm.

[0014] Liquid organic UV filters are liquid at ambient temperature (ie, 25°C).

[0015] Solid organic UV filters are solid at ambient temperature (ie, 25° C.).

[0016] As used herein, a "mixture of branched and linear saturated C15-C19 alkanes" means that the mixture contains different alkanes, each of which contains only 15, 16, 17, 18, or 19 carbon atoms, and does not contain any alkanes with fewer carbon atoms. Thus, such a mixture does not contain, for example, dodecane or isododecane. The mixture contains both branched and linear C15-C19 alkanes.

[0017] The term "shampoo," as used herein, refers to a hair care composition used to cleanse hair, i.e., remove oil, dirt, skin debris, dandruff, environmental pollutants, and other contaminant particles that gradually build up in the hair. The term shampoo also includes conditioning shampoos. Shampoo preparations according to the present invention are applied to the hair and then rinsed off with water and are well known to those skilled in the art.

[0018] The term "hair conditioner" as used herein refers to a hair care composition that is applied after washing with a cleansing composition such as a shampoo. Conditioners make hair softer, more flexible, easier to comb, and impart other desirable properties to hair. Such hair conditioners can be leave-in or rinse-out products and are well known to those skilled in the art.

[0019] White is not considered a "color" herein.

[0020] The term "color fastness" refers to the resistance of the dye to being washed away with water when the dyed hair is washed with a detergent, typically a shampoo. Thus, improved color fastness means reduced removal of the hair dye from the dyed hair by washing / shampooing.

[0021] [Mixture of branched and straight-chain saturated C15-C19 alkanes] The hair care composition comprises a mixture of branched and straight chain saturated C15-C19 alkanes.

[0022] Particularly suitable mixtures of C15 to C19 alkanes include those disclosed in WO 2016 / 185046, WO 2017 / 046177, WO 2018 / 109353 A1 and WO 2018 / 109354 A1 and WO 2018 / 172228 A1, among others.

[0023] Preferably, the mixture of branched and linear saturated C15-C19 alkanes has a bio-derived carbon content of 90% or more based on the total weight of the mixture of branched and linear saturated C15-C19 alkanes. Bio-derived chemicals are highly advantageous because such materials have a high degree of sustainability. Highly sustainable products or compositions are in high demand in the market.

[0024] The determination of the biobased content of natural range materials or biogenic carbonates is carried out in accordance with standards ASTM D 6866-12, Method B (ASTM D 6866-06) and ASTM D 7026 (ASTM D 7 026-04). Standard ASTM D 6866 is a standard for "Determining the Biobased Content of Natural Range Materials Using Radiocarbon and Isotope Ratio Mass Spectrometry Analysis", while standard ASTM D 7 026 is a standard for "Sampling and Reporting of Results for Determination of Biobased Content of Materials via Carbon Isotope Analysis". The second standard refers to the first standard in its first paragraph. The first standard is based on the determination of the biobased content of the sample. 14 C / 12 The C ratio measurement test is described, and this is based on the reproducible standard material of the 100% original sample. 14 C / 12 The C ratio is compared with the C ratio to give the relative proportion of C of renewable origin in the sample. 14 It is based on the same concept as C dating.

[0025] It is further preferred that the composition has no aromatic hydrocarbons or only a small amount (less than 100 ppm, especially less than 30 ppm) of aromatic hydrocarbons relative to the total weight of the mixture of branched and linear saturated C15 to C19 alkanes.

[0026] The mixture of branched and linear saturated C15-C19 alkanes is produced by catalytic hydrogenation of a hydrocarbon biomass feedstock, in particular as described in detail in WO 2016 / 185046, and in particular as disclosed as Example 3 of WO 2016 / 185046.

[0027] It is preferred that the amount of linear saturated C15 to C19 alkanes in said mixture of branched and linear saturated C15 to C19 alkanes is less than 10% by weight, preferably less than 8% by weight, most preferably at least 5% by weight, based on the weight of said mixture of branched and linear saturated C15 to C19 alkanes.

[0028] More preferably, the amount of C15 is less than 3% by weight, in particular less than 1% by weight, preferably less than 0.05% by weight, relative to the weight of said mixture of branched and linear saturated C15 to C19 alkanes.

[0029] Preferably, the mixture of branched and straight-chain saturated C15 to C19 alkanes is a mixture of branched and straight-chain saturated C16 to C19 alkanes.

[0030] More preferably, the amount of branched saturated C16-C18 alkanes is more than 90% by weight, preferably more than 95% by weight, based on the weight of said mixture of branched and linear saturated C15-C19 alkanes.

[0031] More preferably, the amount of C15 alkanes is less than 5% by weight, in particular less than 2% by weight, relative to the weight of said mixture of branched and linear saturated C15 to C19 alkanes.

[0032] More preferably, the amount of branched saturated C17-C18 alkanes is more than 85% by weight, preferably more than 92% by weight, based on the weight of said mixture of branched and linear saturated C15-C19 alkanes.

[0033] More preferably, the amount of C17 alkane is between greater than 15 and 20% by weight relative to the weight of said mixture of branched and linear saturated C15 to C19 alkanes.

[0034] More preferably, the amount of branched saturated C18 alkanes is more than 50% by weight, preferably more than 60% by weight, more preferably more than 70% by weight, based on the weight of said mixture of branched and linear saturated C15-C19 alkanes.

[0035] More preferably, the amount of C18 alkanes is in particular 70 to 75% by weight, based on the weight of said mixture of branched and linear saturated C15 to C19 alkanes.

[0036] In other words, the mixture of branched and linear saturated C15-C19 alkanes preferably consists primarily of C18 alkanes, and most preferably consists primarily of branched C18 alkanes.

[0037] Since the hair care composition comprises a mixture of branched and linear saturated C15 to C19 alkanes, the composition does not comprise lower alkanes, i.e. in particular does not comprise C12 alkanes, and in particular does not comprise C12 alkanes, nor C13 alkanes, nor C14 alkanes.

[0038] More preferably, the viscosity of the mixture of C15 to C19 alkanes at 20°C is 3 to 15 mPa·s, particularly 6 to 12 mPa·s.

[0039] The refractive index of the mixture of C15 to C19 alkanes at 20° C. is more preferably 1.40 to 1.48, particularly preferably 1.42 to 1.45, and most preferably 1.43 to 1.44.

[0040] More preferably, the mixture of C15 to C19 alkanes is the mixture of C15 to C19 alkanes commercialized as EMOGREEN (trademark) L19 from SEPPIC.

[0041] The amount of the mixture of branched and linear saturated C15-C19 alkanes is in the range of 0.015 to 12.0% by weight, particularly in the range of 0.5 to 11.0% by weight, preferably in the range of 1.0 to 10.0% by weight, more preferably in the range of 1.5 to 8.0% by weight, and even more preferably in the range of 2.0 to 6.0% by weight, based on the weight of the hair care composition.

[0042] [Ester of fatty acid and dextrin] The hair care composition further comprises an ester of a fatty acid and a dextrin.

[0043] Dextrin is an oligomer of D-glucose. Its structure can be represented by the simplified structure shown below. [ka]

[0044] Dextrins have various average degrees of sugar chain polymerization, and therefore various molecular weights.

[0045] The dextrin of the ester of fatty acid and dextrin in the present invention preferably has an average degree of polymerization of sugar chains of 3 to 20, particularly 8 to 16.

[0046] The fatty acid of the ester of fatty acid and dextrin is preferably a C14 to C18 fatty acid, particularly a straight-chain C14 to C18 fatty acid, most preferably palmitic acid.

[0047] A particularly suitable ester of fatty acid and dextrin is dextrin palmitate, commercially available from Chiba Flour Milling as Rheopearl® KL2.

[0048] Dextrin has several hydroxyl groups that can be esterified.

[0049] Preferably, the average number of esterified hydroxyl groups in the ester of fatty acid with dextrin is greater than 2.5, preferably between 2.5 and 3.5, more preferably between 2.5 and 3.4, and most preferably between 2.5 and 3.2 per glucose unit.

[0050] In other words, most of the hydroxyl groups of the dextrin are preferably esterified.

[0051] The ester of fatty acid and dextrin has a molecular weight M of 8,000 to 16,000 Da, preferably 9,000 to 13,000 Da, more preferably 10,000 to 11,500 Da. nIt is more preferable that the .alpha.-hydroxybenzoate has the following structure:

[0052] The molecular weight Mn is determined in Daltons (Da) by SEC / GPC, in particular using polystyrene as standard.

[0053] Both fatty acids and dextrins are bio-derived. Bio-derived chemicals are highly advantageous as they make such materials or their products more sustainable. Sustainable products or compositions are in high demand in the market.

[0054] The amount of the fatty acid and dextrin ester is preferably in the range of 0.01 to 15 wt %, particularly 0.1 to 12 wt %, preferably 0.2 to 8 wt %, more preferably 0.6 to 7 wt %, even more preferably 0.8 to 6 wt %, and most preferably 1.3 to 4 wt %, based on the weight of the hair care composition.

[0055] In the hair care composition, the ratio of the weight of the ester of fatty acid and dextrin to the weight of the mixture of branched and linear saturated C15-C19 alkanes is preferably less than 1, preferably in the range of 0.5 to 0.8, and most preferably in the range of 0.55 to 0.70.

[0056] In other words, the weight of the C15 to C19 alkane contained in the present composition is preferably greater than the weight of the ester of fatty acid and dextrin.

[0057] [Cationic emulsifier] The hair care compositions of the present invention further contain a cationic emulsifier.

[0058] The cationic emulsifier is preferably an organic ammonium compound, especially a quaternary ammonium compound.

[0059] The ammonium compound preferably has at least the following structure: [ka] (In the formula, R 1 , R 2 and R 3 are each independently H or a straight or branched chain C 1~6 represents one of the alkyl groups; R 4 is a linear or branched C 1~ represents a C6 alkyl group; R 5 is linear or branched, saturated or olefinically unsaturated C 1~25 represents an alkyl group; The dotted line represents the bond by which the ammonium group is attached to the remainder of the ammonium compound, i.e., the cationic emulsifier.

[0060] Furthermore, it is preferred that the organic ammonium compound has a molecular weight of at least 350 daltons (g / mol), preferably 350 to 1,000 daltons (g / mol).

[0061] The cationic emulsifier is preferably a quaternary ammonium compound.

[0062] Preferably, the cationic emulsifier is a substance defined by a CAS number selected from the group consisting of [17301-53-0], [92201-88-2], [1156505-34-8], and [51277-96-4].

[0063] Particularly preferred cationic emulsifiers are behentrimonium chloride, quaternium-87, brassicyl isoleucinate esylate, palmitamidopropyltrimonium chloride, which are defined by INCI names.

[0064] The hair care composition preferably comprises the cationic emulsifier in an amount ranging from 0.5 to 10% by weight, in particular from 0.5 to 8% by weight, preferably from 1 to 6% by weight, based on the weight of the hair care composition.

[0065] The hair care composition is applied to hair, particularly human hair.

[0066] In one embodiment, the hair care composition is a product for washing hair, in particular such a wash hair care composition is a shampoo.

[0067] Thus, in this embodiment, such products typically comprise a cleaning agent which is a surfactant, preferably an anionic surfactant or a nonionic surfactant or an amphoteric or zwitterionic surfactant.

[0068] Exemplary anionic surfactants include alkyl sulfates, alkyl ether sulfates, alkyl sulfonates, alkylaryl sulfonates, alkyl succinates, alkyl sulfosuccinates, N-alkyl sarcosinates, acyltaurates, acyl isethionates, alkyl phosphates, alkyl ether phosphates, alkyl ether carboxylates, and α-olefin sulfonates, particularly alkali and alkaline earth metal salts such as sodium, potassium, magnesium, and calcium, as well as ammonium salts and triethanolamine salts. The alkyl ether sulfates, alkyl ether phosphates, and alkyl ether carboxylates may contain 1 to 10 ethylene oxide or propylene oxide units, preferably 1 to 3 ethylene oxide units, per molecule. Suitable anionic surfactants are, for example, sodium lauryl sulfate, ammonium lauryl sulfate, sodium lauryl ether sulfate (also known as sodium laureth sulfate), ammonium lauryl ether sulfate (also known as ammonium laureth sulfate), sodium lauroylsulconate, sodium oleyl succinate, ammonium lauryl sulfosuccinate, sodium dodecylbenzenesulfonate, triethanolamidodecylbenzolsulfonic acid. Particularly preferred anionic surfactants for use in shampoos according to the invention are sodium lauryl sulfate, ammonium lauryl sulfate, sodium lauryl ether sulfate, and ammonium lauryl ether sulfate, and mixtures thereof.

[0069] The anionic surfactant is typically included in an amount (as an active ingredient) in the range of 0.1 to 50% by weight, more preferably in the range of 5 to 20% by weight, based on the total weight of the shampoo.

[0070] Exemplary nonionic surfactants that can be included in shampoos according to the present invention include condensation products of aliphatic (C8-C18) primary or secondary straight- or branched-chain alcohols with alkylene oxides, usually ethylene oxide, generally containing 6 to 30 ethylene oxide groups. Other representative nonionic surfactants include mono- or dialkyl alkanolamides, such as coconut oil fatty acid mono- or diethanolamide and coconut oil fatty acid monoisopropanolamide. Nonionic surfactants that can be included in shampoo formulations according to the present invention are alkyl polyglycosides (APGs). APGs typically contain an alkyl group attached (optionally via a bridging group) to a block of one or more glycosyl groups, such as Oramix NS 10 from Seppic; Plantacare 818UP, Plantacare 1200, and Plantacare 2000 from Cognis.

[0071] The nonionic surfactant is typically included in an amount (as an active ingredient) in the range of 0.5 to 8% by weight, more preferably in the range of 2 to 5% by weight, based on the total weight of the shampoo.

[0072] Exemplary amphoteric or zwitterionic surfactants include alkylamine oxides, alkylbetaines, alkylamidopropylbetaines, alkylsulfobetaines (sultaines), alkylglycinates, alkylcarboxyglycinates, alkylamphoacetates, alkylamphopropionates, alkylamphoglycinates, alkylamidopropylhydroxysultaines, acyltaurates, and acylglutamates, in which the alkyl and acyl groups have 8 to 19 carbon atoms. Typical amphoteric and zwitterionic surfactants used in shampoos include laurylamine oxide, cocodimethylsulfopropylbetaine, laurylbetaine, cocamidopropyl betaine (CAPB), sodium cocoamphoacetate, and disodium cocoamphodiacetate. Particularly preferred amphoteric or zwitterionic surfactants for use in shampoos are cocamidopropyl betaine and disodium cocoamphodiacetate, and mixtures thereof.

[0073] The amphoteric or zwitterionic surfactant is typically included in an amount in the range of 0.5 to 8% by weight (as active ingredient), preferably 1 to 4% by weight, based on the total weight of the shampoo.

[0074] In another more preferred embodiment, the hair care composition is a hair conditioner.

[0075] The hair care composition, especially the hair conditioner, is preferably an emulsion, microemulsion, oleogel, hydrodispersion, or lipodispersion.

[0076] The hair care cosmetic composition may also be in the form of a suspension or dispersion in a solvent or fatty substance, or in the form of an emulsion or microemulsion (in particular of the oil-in-water (O / W) or water-in-oil (W / O) type, silicone-in-water (Si / W) or water-in-silicone (W / Si) type, PIT emulsion, multiple emulsion (for example of the oil-in-water-in-oil (O / W / O) type or water-in-oil-in-water (W / O / W) type)), Pickering emulsion, hydrogel, alcoholic gel, lipogel, single- or multiphase solution or vesicle dispersion.

[0077] Preferred hair care compositions in all embodiments of the present invention comprise water, preferably in an amount of 55 to 99% by weight, especially 80 to 95% by weight, based on the weight of the hair care composition.

[0078] Preferred hair care compositions contain water and are in the form of an emulsion.

[0079] In particular, the emulsion comprises an oily phase and an aqueous phase, such as in particular an O / W, W / O, Si / W, W / Si, O / W / O, W / O / W multiple or Pickering emulsion.

[0080] The total amount of oily phase present in such emulsions is preferably at least 4% by weight, for example in the range of 4 to 30% by weight, preferably in the range of 6 to 24% by weight, most preferably in the range of 8 to 18% by weight, based on the total weight of the cosmetic composition.

[0081] The amount of aqueous phase present in such emulsions is preferably at least 50% by weight, for example in the range of 50 to 98% by weight, preferably in the range of 60 to 95% by weight, most preferably in the range of 70 to 92% by weight, based on the total weight of the composition.

[0082] More preferably, the cosmetic composition is in the form of an oil-in-water (O / W) emulsion comprising an oily phase dispersed in an aqueous phase in the presence of an O / W or Si / W emulsifier. The preparation of such O / W emulsions is well known to those skilled in the art.

[0083] The composition in the form of an O / W emulsion can be provided, for example, in any formulation form of an O / W emulsion, such as a serum, milky lotion or cream, which are prepared according to conventional methods.

[0084] The hair care composition preferably comprises a UV filter, which may be solid or liquid.

[0085] Suitable liquid organic UV filters absorb light in the UV(B) and / or UV(A) region and are liquid at ambient temperature (i.e., 25° C.). Such liquid UV filters are known to those skilled in the art and include, in particular, cinnamic acid esters such as octyl methoxycinnamate (PARSOL® MCX) and isoamyl methoxycinnamate (Neo Heliopan® E 1000), salicylic acid esters such as homosalate (3,3,5-trimethylcyclohexyl 2-hydroxybenzoate, PARSOL® HMS) and ethylhexyl salicylate (also known as ethylhexyl salicylate, 2-ethylhexyl 2-hydroxybenzoate, PARSOL® EHS), acrylic acid esters such as octocrylene (2-cyano-3,3-diphenyl 2-ethylhexyl acrylate, PARSOL® 340) and 2-cyano-3 ,3-diphenylethyl acrylate, esters of benzalmalonic acid, particularly benzalmalonic acid dialkyl esters, such as di(2-ethylhexyl) 4-methoxybenzalmalonate and polysilicone 15 (Parsol® SLX), dialkyl esters of naphthalic acid, such as diethylhexyl 2,6 naphthalate (Corapan® TQ), syringylidene malonic acid esters, such as diethylhexyl syringylidene malonate (Oxynex® ST liquid), and benzotriazolyl dodecyl p-cresol (Tinoguard® TL), as well as oxybenzone-3 and drometrizole trisiloxane.

[0086] Particularly advantageous liquid organic UV filters are octyl methoxycinnamate, homosalate, ethylhexyl salicylate, octocrylene, diethylhexyl 2,6 naphthalate, diethylhexyl syringylidene malonate, benzotriazolyl dodecyl p-cresol, oxybenzone-3, drometrizole trisiloxane and mixtures thereof.

[0087] In a preferred embodiment, the liquid UV filter is a liquid UV(B) filter selected from the group consisting of ethylhexyl methoxycinnamate, octocrylene, homosalate, ethylhexyl salicylate, oxybenzone-3 and drometrizole trisiloxane.

[0088] Suitable solid organic UV filters absorb light in the UV(B) and / or UV(A) region and are solid at ambient temperature (i.e., 25° C.). Particularly suitable solid UV filters are those from the group consisting of bisethylhexyloxyphenol methoxyphenyl triazine, butyl methoxydibenzoylmethane, diethylaminohydroxybenzoyl hexyl benzoate, ethylhexyl triazone, diethylhexyl butamido triazone, 4-methylbenzylidene camphor, and 1,4-di(benzoxazol-2′-yl)benzene and methylenebisbenzotriazolyltetramethylbutylphenol (bisoctrizole).

[0089] Bisoctrizol is a broadband ultraviolet radiation filter that absorbs not only UV(B) rays but also UV(A) rays and has excellent photostability. Its absorption maxima are at 308 nm and 349 nm. Meanwhile, it not only absorbs UV light but also reflects and scatters it. Therefore, Bisoctrizol is a multifunctional UV absorber and an organic UV filter manufactured as fine (<200 nm) organic particles. While other organic UV filters need to be dissolved in either an oily or aqueous phase, Bisoctrizol is applied as invisible particles because it is difficult to dissolve in either.

[0090] Preferred solid organic UV(A) filters are UV(A) filters selected from the group consisting of bisethylhexyloxyphenol methoxyphenyl triazine, butyl methoxydibenzoylmethane, diethylaminohydroxybenzoyl hexyl benzoate and trisbiphenyl triazine.

[0091] Preferred solid organic UV(B) filters are UV(B) filters selected from the group consisting of ethylhexyl triazone (=Uvinul® T150), diethylhexylbutamido triazone (=Uvasorb® HEB) and 4-methylbenzylidene camphor (=Parsol® 5000).

[0092] The hair care compositions, in particular hair conditioners, may comprise commonly used oily and fatty ingredients which may be selected from mineral oils and mineral waxes; oils, such as triglycerides of capric and / or caprylic acid or castor oil; oils or waxes and other natural or synthetic oils, in preferred embodiments esters of fatty acids with alcohols, such as isopropanol, propylene glycol, glycerin, or esters of fatty alcohols with carbonic acid or fatty acids; alkyl benzoate esters; and / or silicone oils.

[0093] In particular, exemplary fatty substances that can be incorporated into the oil phase of the emulsions, microemulsions, oily gels, hydrodispersions or lipodispersions are advantageously selected from esters of saturated and / or unsaturated linear or branched alkylcarboxylic acids having from 3 to 30 carbon atoms with saturated and / or unsaturated linear and / or branched alcohols having from 3 to 30 carbon atoms and esters of aromatic carboxylic acids with saturated and / or unsaturated linear or branched alcohols having from 3 to 30 carbon atoms. Such esters may advantageously be chosen from octyl palmitate, octyl cocoate, octyl isostearate, octyldodecyl myristate, cetearyl isononanoate, isopropyl myristate, isopropyl palmitate, isopropyl stearate, isopropyl oleate, n-butyl stearate, n-hexyl laurate, n-decyl oleate, isooctyl stearate, isononyl stearate, isononyl isononanoate, 2-ethylhexyl palmitate, 2-ethylhexyl laurate, 2-hexyldecyl stearate, 2-octyldodecyl palmitate, stearyl heptanoate, oleyl oleate, oleyl erucate, erucyl oleate, erucyl erucate, tridecyl stearate, tridecyl trimellitate and synthetic, semi-synthetic or natural mixtures of such esters, for example jojoba oil.

[0094] Other fatty ingredients that are particularly suitable for hair conditioners include polar oils, such as lecithin, and fatty acid triglycerides, i.e. triglycerol esters of saturated and / or unsaturated linear or branched carboxylic acids having 8 to 24 carbon atoms, preferably 12 to 18 carbon atoms, preferably synthetic, semi-synthetic or natural oils, such as coconut oil glycerides, olive oil, sunflower oil, soybean oil, peanut oil, rapeseed oil, almond oil, palm oil, coconut oil, castor oil, hydrogenated castor oil, wheat oil, grape seed oil, macadamia seed oil, etc. ); non-polar oils, such as linear and / or branched hydrocarbons and waxes, for example, mineral oil, petrolatum (petrolatum); paraffins, squalane and squalene, polyolefins, hydrogenated polyisobutene and isohexadecane, with polydecene being the preferred polyolefin; dialkyl ethers, for example dicaprylyl ether; linear or cyclic silicone oils, preferably selected from cyclomethicone (octamethylcyclotetrasiloxane); cetyl dimethicone, hexamethylcyclotrisiloxane, polydimethylsiloxane, poly(methylphenylsiloxane), etc., and mixtures thereof.

[0095] Other fatty ingredients that can be advantageously incorporated into the present hair conditioner include isoeikosane; neopentyl glycol diheptanoate; propylene glycol dicaprylate / caprate; caprylyl / capric / diglyceryl succinate; butylene glycol caprylate / caprate; C 12~13 -Alkyl lactic acid; di-C 12~13 -Dialkyl tartrate; triisostearin; dipentaerythrityl hexa(caprylate / caprate) hexa(caprylate / caprate) propylene glycol monoisostearate; tricaprylin; dimethyl isosorbide. C 12~15 -Mixture of alkyl benzoate and 2-ethylhexyl isostearate, C12~15 -Alkyl benzoate and isotridecyl isononanoate mixture and C 12~15 It is particularly advantageous to use a mixture of 2-alkyl benzoate, 2-ethylhexyl isostearate and isotridecyl isononanoate.

[0096] The oily phase of the hair conditioner may also include natural plant or animal waxes such as beeswax, china wax, bumblebee wax and other insect waxes as well as shea butter and cocoa butter.

[0097] Suitable silicone oils include, for example, dimethylpolysiloxane, diethylpolysiloxane, diphenylpolysiloxane, cyclic siloxane, poly(methylphenylsiloxane), and amino-, fatty acid-, alcohol-, polyether-, epoxy-, fluorine-, glycoside-, and / or alkyl-modified silicone compounds that are liquid or solid at room temperature, as well as mixtures thereof. The number-average molecular weight of dimethicone and poly(methylphenylsiloxane) is preferably in the range of 100 to 150,000 g / mol. Preferred cyclic siloxanes are those containing 4- to 8-membered rings, which are commercially available, for example, as cyclomethicone.

[0098] The hair care composition is preferably a hair conditioner.

[0099] The hair care composition is more preferably free of anionic surfactants and / or free of nonionic surfactants, and even more preferably, the hair care composition is a hair conditioner free of anionic or nonionic surfactants.

[0100] The hair care composition, in particular a shampoo or a hair conditioner, may comprise further ingredients known to be commonly used in the preparation of hair care compositions, in particular shampoos or hair conditioners, respectively.

[0101] The hair care composition preferably comprises: - 0.015 to 12.0% by weight, in particular 0.5 to 11% by weight, preferably 1 to 10% by weight, more preferably 1.5 to 8% by weight, most preferably 2 to 6% by weight of a mixture of branched and linear saturated C15 to C19 alkanes as described in detail above, - 0.01 to 15.0% by weight, in particular 1 to 112% by weight, preferably 0.2 to 8.0% by weight, more preferably 0.6 to 7% by weight, even more preferably 0.8 to 6% by weight, and most preferably 1.3 to 4% by weight of a fatty acid ester with a dextrin, as described in detail above; - 0.5 to 10.0% by weight, preferably 1.0 to 6.0% by weight, of a cationic emulsifier as described in detail above, - 50 to 99% by weight, preferably 80 to 95% by weight, of water provided that the total amount of each ingredient does not exceed 100%.

[0102] [Resistance of hair dyes applied to hair] The hair care compositions detailed above have been observed to enhance the color fastness of hair dyes applied to hair.

[0103] It is difficult to express color. One method is to express color using the so-called Lab color space. The Lab method that is mainly used today is the CIE-L method proposed by the CIE in 1976. * a * b * In this expression, the parameter "L" or "L * " is the brightness, and the parameter "a" or "a * " and "b" or "b * " is the color-opponent dimension. The parameter L or L * The value of is in the range of 0 to 100, and the parameters a and b or a * and b * The value is in the range of -100 to 100.

[0104] Therefore, the color change is either L or L * The change in the value of (= ΔL or ΔL* ), a or a * Change in the value of (=Δa or Δa * ), and / or b or b * The change in the value of (=Δb or Δb * ) is defined by

[0105] The theory behind it is somewhat complicated, but L or L * The lower the value, the darker the color will appear. * When the value of b increases, the red component is perceived as stronger. * As the value increases, the yellow component appears stronger.

[0106] Usually, when the color changes, the parameters L, a, or b, or L * , a * or b * Rather than only one parameter being varied individually, two or more of these parameters are varied simultaneously.

[0107] Therefore, ΔE or ΔE according to the following formula * The color difference expressed as

number

[0108] Evaluation of the benefits of the present invention is best realized by comparing the measured color of dyed hair before and after a wash and conditioning cycle.

[0109] [Hair dye] Essentially, the present invention relates to any hair dye known to those skilled in the art.

[0110] [Semi-permanent hair dye] In a preferred embodiment, the hair dye is a semi-permanent hair dye.

[0111] Semi-permanent hair dyes are advantageous in that they are very easy to apply, suitable for regular use, and do not use oxidizing agents, making them a particularly gentle hair and skin dyeing method. However, the number of different shades of hair color is somewhat limited. Furthermore, semi-permanent hair dyes are not well suited to dyeing gray or white hair. Finally, semi-permanent hair dyes cannot be used to obtain a shade lighter than the actual hair color, so the coloring possibilities for people with naturally dark or black hair are limited.

[0112] Semi-permanent hair dyes generally include compounds with common chromophore systems in dye chemistry, such as nitro, azo, anthraquinone, triphenylmethane, triarylmethane, and azomethane, which can be used as disperse dyes, nitro dyes, cationic (basic) dyes, anionic (acid) dyes, and metal complex dyes (as described in Ullmann's Encyclopedia of Industrial Chemistry Vol. A 12, page 586, 5th, completely revised edition, 1989). Of particular interest are, for example, anthraquinone dyes, especially those containing dialkylaminoalkylamino (DAAA) groups. Specific examples include compounds available under the trademark ARIANOR® from Warner Jenkinson Ltd.: ARIANOR Straw Yellow, ARIANOR Mahogany, ARIANOR Steel Blue, ARIANOR Madder Red, ARIANOR Ebony, and ARIANOR Sienna Brown.

[0113] Further very suitable anthraquinone dyes are anthraquinones with quaternary ammonium side chains.

[0114] Specific examples of nitro dyes are compounds selected from the group consisting of 2-((2-nitrophenyl)amino)ethanol (CAS: 4926-55-0), 4-((2-hydroxyethyl)amino)-3-nitrophenol (CAS: 92952-81-3), 2-((4-amino-2-nitrophenyl)amino)ethan-1-ol (CAS: 2871-04), N,N'-bis(2-hydroxyethyl)-2-nitro-p-phenylenediamine (CAS: 84041-77-0), and 2,2'-((4-((2-hydroxyethyl)amino)-3-nitrophenyl)imino)bisethanol (CAS: 33229-34-4), 2-nitro-p-phenylenediamine (CAS: 5307-14-2), and 4-nitro-o-phenylenediamine (CAS: 99-56-9).

[0115] Semi-permanent hair dyes are commercially available in a variety of chemical compositions and colors. Particularly suitable semi-permanent hair dyes are those implemented in commercial product lines selected from the group consisting of Revlon® Professional Nutri Color™ Filters from Revlon®, John Freida Violet Crush for Blondes from Kao Brands, Revolution Haircare Tones for Brunettes from Revlon®, Good Dye Young from Good Dye Young, Wella Color by You from Coty, and Syoss Color Glow from Schwarzkopf & Henkel.

[0116] [Permanent hair dye] In another preferred embodiment, the hair dye is a permanent hair dye.

[0117] Permanent hair dyes have the advantage over other types of hair dyes in that they offer the highest color fastness of any hair dye, have excellent color coverage, especially on white or gray hair, and offer the widest variety of colors and shades available. However, permanent hair dyes are somewhat aggressive due to the chemical oxidation and fixation process.

[0118] Permanent hair dyes typically contain three ingredients: (1) Primary intermediate agent, (2) a coupling agent, and (3) Oxidizing agent The permanent hair color composition is produced by a method requiring

[0119] The process for producing permanent hair dyes is usually carried out under basic conditions using alkalizing agents.

[0120] The oxidation mechanism involves three steps: 1) oxidation of primary intermediates, 2) reacting this primary intermediate with a coupling agent, and 3) Oxidation of the resulting compound with an oxidizing agent to form the final dye. Includes:

[0121] The oxidizing agent is typically hydrogen peroxide, and the alkaline environment is typically created by ammonia. The combination of hydrogen peroxide and ammonia lightens the natural hair and provides a "blank canvas" for the dye. The ammonia opens the hair shaft pores, allowing the dye to actually diffuse into the fiber. These dye intermediates and coupling agents form high molecular weight products through the oxidation and coupling reaction, which become trapped in the hair matrix and cannot be easily removed by washing.

[0122] [Primary intermediate agent] Primary intermediate agents are well known for use in hair coloring and are ortho or para substituted aminophenols or phenylenediamines, particularly those of the formula: [ka] (In the formula, R 11 and R 12 are each independently hydrogen, C 1~6 -C substituted with alkyl, or one or more hydroxy, methoxy, methylsulfonylamino, aminocarbonyl, furfuryl, unsubstituted phenyl, or amino-substituted phenyl groups 1~6 - alkyl; and R 13 , R 14 , R 15 and R 16 are each independently hydrogen, C 1~6 -Alkyl, C 1~6 - C substituted with alkoxy, halogen, or one or more hydroxy or amino groups 1~6 -alkyl) paraphenylenediamines.

[0123] Preferred primary intermediate agents are para-phenylenediamine, 2-methyl-1,4-diaminobenzene, 2,6-dimethyl-1,4-diaminobenzene, 2,5-dimethyl-1,4-diaminobenzene, 2,3-dimethyl-1,4-diaminobenzene, 2-chloro-1,4-diaminobenzene, 2-methoxy-1,4-diaminobenzene, 1-phenylamino-4-aminobenzene, 1-dimethylamino-4-aminobenzene, 1-diethylamino-4-aminobenzene, 1-bis(beta-hydroxyethyl)amino-4-aminobenzene, 1-methoxy- and 2,6-dimethyl-3-methoxy-1,4-diaminobenzene, 1-amino-4-hydroxybenzene, 1-hydroxyethyl-4,5-diaminopyrazole, 6-methoxy-2-methylamino-3-aminopyridine, and derivatives thereof, and acid or base salts thereof.

[0124] Particularly preferred primary intermediate agents are p-phenylenediamine, p-aminophenol, o-aminophenol, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, 2,5-diaminotoluene, salts thereof and mixtures thereof.

[0125] [Color coupling agent] Color coupling agents include, in particular, m-aminophenol, 2,4-diaminotoluene, 4-amino-2-hydroxytoluene, phenylmethylpyrazolone, (3-methyl-1-phenyl-5-pyrazolone), 3,4-methylenedioxyphenol, 3,4-methylenedioxy-1-[(beta-hydroxyethyl)amino]benzene, 1-methoxy-2-amino-4-[(beta-hydroxyethyl)amino]benzene, 1-hydroxy-3-(dimethylamino)benzene, 6-methyl-1-hydroxy-3[(beta-hydroxyethyl)amino]benzene, 1-methyl-2-hydroxy-4- ... 2,4-Dichloro-1-hydroxy-3-aminobenzene, 1-Hydroxy-3-(diethylamino)benzene, 1-Hydroxy-2-methyl-3-aminobenzene, 2-Chloro-6-methyl-1-hydroxy-3-aminobenzene, 1,3-Diaminobenzene, 6-Methoxy-1,3-diaminobenzene, 6-Hydroxyethoxy-1,3-diaminobenzene, 6-Methoxy-5-ethyl-1,3-diaminobenzene, 6-Ethoxy-1,3-diaminobenzene, 1-Bis(beta-hydrogen 6-(beta-hydroxyethyl)amino-3-aminobenzene, 2-methyl-1,3-diaminobenzene, 6-methoxy-1-amino-3-[(beta-hydroxyethyl)amino]-benzene, 6-(beta-aminoethoxy)-1,3-diaminobenzene, 6-(beta-hydroxyethoxy)-1-amino-3-(methylamino)benzene, 6-carboxymethoxy-1,3-diaminobenzene, 6-ethoxy-1-bis(beta-hydroxyethyl)amino-3-aminobenzene, 6-hydroxyethyl-1,3-diaminobenzene, 1 -Hydroxy-2-isopropyl-5-methylbenzene, 1,3-dihydroxybenzene, 2-chloro-1,3-dihydroxybenzene, 2-methyl-1,3-dihydroxybenzene, 4-chloro-1,3-dihydroxybenzene, 5,6-dichloro-2-methyl-1,3-dihydroxybenzene, 1-hydroxy-3-amino-benzene, 1-hydroxy-3-(carbamoylmethylamino)benzene, 6-hydroxybenzomorpholine, 4-methyl-2,6-dihydroxypyridine, 2,6-dihydroxypyridine, 2,6-Diaminopyridine, 6-aminobenzomorpholine, 1-phenyl-3-methyl-5-pyrazolone, 1-hydroxynaphthalene, 1,7-dihydroxynaphthalene, 1,5-dihydroxynaphthalene, 5-amino-2-methylphenol, 4-amino-2-hydroxytoluene, 2-amino-3-hydroxytoluene, 2-amino-5-hydroxytoluene, 4-hydroxyindole, 4-hydroxyindoline, 6-hydroxyindole, 6-hydroxyindoline, 2,4-diaminophenoxyethanol, 1-naphthol, 2-naphthol, phenol, catechol, m-aminophenol, m- The compound is selected from the group consisting of phenylenediamines, phenols substituted on the amino group or benzene ring with at least one alkyl, hydroxyalkyl, or alkylamino group; catechols substituted on the amino group or benzene ring with at least one alkyl, hydroxyalkyl, or alkylamino group; m-aminophenols substituted on the amino group or benzene ring with at least one alkyl, hydroxyalkyl, or alkylamino group; m-phenylenediamines substituted on the amino group or benzene ring with at least one alkyl, hydroxyalkyl, or alkylamino group; and mixtures thereof.

[0126] Preferred color coupling agents are selected from the group consisting of resorcinol, 1-naphthol, 2-methylresorcinol, 4-amino-2-hydroxytoluene, m-aminophenol, 2,4-diaminophenoxyethanol, 3-methyl-1-phenyl-5-pyrazolone, salts thereof, or mixtures thereof.

[0127] [Alkalizing agent] Preferably, the permanent hair color composition contains an alkalizing agent. The term "alkalinizing agent" refers to an ingredient capable of imparting alkalinity (e.g., a pH greater than 7) to the oxidizing composition. Preferred alkalizing agents are ammonium hydroxide, metal hydroxides, alkanolamines, sodium silicate, metal carbonates, sodium metasilicate, and mixtures thereof. Suitable metal hydroxides and carbonates include hydroxides or carbonates of alkali metals and alkaline earth metals. Examples of such metal hydroxides include hydroxides of sodium, potassium, lithium, calcium, magnesium, etc. A particularly preferred alkaline earth metal hydroxide is sodium hydroxide. Preferably, the alkanolamine is selected from the group consisting of mono-, di- and trialkanolamines, such as monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), 2-aminobutanol, aminoethylpropanediol, aminomethylpropanediol, bis-hydroxyethyltromethamine (=bis(2-hydroxyethyl)amino-tris(hydroxymethyl)methane), diethylethanolamine, diisopropanolamine, dimethylaminomethylpropanol, dimethylMEA (=2-(dimethylamino)-ethan-1-ol), isopropanolamine, methylethanolamine, mixed isopropanolamines, triisopropanolamine, tromethamine (=tris(hydroxymethyl)aminomethane) and mixtures thereof. A particularly preferred alkanolamine is monoethanolamine (MEA).

[0128] Most preferred are dye mixtures containing aqueous ammonia as the alkalizing agent in combination with a second alkalizing agent such as an alkanolamine.

[0129] Permanent hair color compositions are commercially available in a variety of chemical compositions and colors. Particularly suitable permanent hair dyes are those from commercial product lines selected from the group consisting of Schwarzkopf Brilliance from Schwarzkopf, chwarzkopf got2b Edelmetall from Schwarzkopf & Henkel, L'Oreal Preference Vivid Colors from L'Oreal, Revlon® Total Color™ from Revlon, Schwarzkopf Brilliance Gem Collection from Schwarzkopf & Henkel, Wella Professional Koleston Perfect Pure Naturals from Wella, Wella Koleston from Coty, Beautycolor Bela&Cor from Bonyplus, Miracle System from Josh Wood Colour, Garnier Nutrisse Ultra Creme Permanent Hair Dye from L'Oreal, and Hello!! Bubble Foam Color - Mise en Scene from Amorepacific.

[0130] As noted above, the hair care compositions detailed above have been observed to enhance the color fastness of hair dyes applied to hair.

[0131] Therefore, in a further aspect, the present invention relates to the use of a mixture of branched and linear saturated C15-C19 alkanes in combination with an ester of a fatty acid and a dextrin and a cationic emulsifier to increase the color fastness of a hair dye applied to hair.

[0132] More specifically, in one preferred embodiment, the hair dye is a semi-permanent hair dye, and in another preferred embodiment, a permanent hair dye.

[0133] [Example] The following examples are provided to further illustrate the compositions and effects of the present invention. These examples are illustrative only and are not intended to limit the scope of the invention in any way.

[0134] [Experiment Series 1: Semi-permanent hair dye] [Hair dyeing with semi-permanent hair dyes] The hair tresses (Kerling Nr. 826204 KT dicht, European hair, remis extra bleached, color 10 / 0, length: 120 mm) were dyed according to the instructions on the packaging of the semi-permanent hair dye. - Revelon Professional® NutriColor™ Filters 190 Blau (containing semi-permanent hair dye HC blue No. 16 (= dimethyl-[3-[[4-(methylamino)-9,10-dioxoanthracen-1-yl]amino]propyl]-propylazanium bromide)); - Revelon Professional® NutriColor™ Filters 200 Violet (containing the semi-permanent hair dye HC blue No. 16 and Basic Violet 2 (= 4-[(4-amino-3-methylphenyl)-(4-imino-3-methylcyclohexa-2,5-dien-1-ylidene)methyl]-2-methylaniline hydrochloride)); - Revelon Professional® NutriColor™ Filters 740 Light Copper (contains the semi-permanent hair dyes Basic Brown 17 (=[8-[(4-amino-2-nitrophenyl)azo]-7-hydroxy-2-naphthyl]trimethylammonium chloride) and Basic Red 76 (=[7-hydroxy-8-[(2-methoxyphenyl)azo]-2-naphthyl]trimethylammonium chloride)); - Revelon Professional® NutriColor™ Filters 524 Coppery Pearl Brown Copper (semi-permanent hair dye Basic Brown 17, Basic Red 51 (= 2-[[4-(dimethylamino)phenyl]azo]-1,3-dimethyl-1H-imidazolium chloride), Basic Yellow 57 (= 3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-N,N,N-trimethylanilinium chloride), Basic Violet 2, HC Blue No. 16).

[0135] The tresses were treated with 1 ml of undiluted hair dye for 5 minutes. The tresses were rinsed with warm water (38°C) for 30 seconds and allowed to dry overnight at room temperature. Three tresses were prepared for each sample.

[0136] [Shampoo / conditioning for semi-permanent dyed hair] For each shampoo / conditioning cycle, the dyed hair tresses were washed with 0.5 ml of shampoo per tress according to the composition in Table 1 for 30 seconds, followed by rinsing with warm water (38°C) for 30 seconds. Then, 0.5 ml of each conditioner (see Table 2 for composition) was applied to each tress, the conditioner was left on the tress for 2 minutes, and then rinsed with warm water (38°C) for 30 seconds. This procedure was repeated five times, for a total of five washes and conditions for each shampoo / conditioning cycle. At the end of each shampoo / conditioning cycle, the tresses were allowed to dry overnight at room temperature.

[0137] [Table 1]

[0138] [Hair care composition] The cosmetic compositions outlined in Table 1 were prepared according to standard methods in the art.

[0139] [Color Measurement] L of hair bundle * a * b * Values were measured before the first shampoo / conditioning cycle (i.e., "after 0 cycles") and after each shampoo / conditioning cycle (i.e., "after 1 cycle," "after 2 cycles," etc.) using a Konica Minolta-CM 600d color measurement device. Each of the three hair tresses was placed side by side and measured using a L * a * b * The values were measured 25 times and the average values are reported in Tables 3, 5, 7 and 9. The ΔL values shown in Tables 4, 6, 8 and 10 * , Δa * , Δb * , ΔE * The color change, denoted as *, is calculated from the initial value and the color measurement after each shampoo / conditioning cycle.

[0140] [Table 2]

[0141] [Table 3]

[0142] [Table 4]

[0143] [Table 5]

[0144] [Table 6]

[0145] [Table 7]

[0146] [Table 8]

[0147] [Table 9]

[0148] [Table 10]

[0149] [Experiment Series 2: Semi-permanent hair dye (II)] The experiments of experimental series 2 were carried out in exactly the same way as the experiments of experimental series 1, with the only exception that the hair tresses (Kerling Nr. 826204 KT dicht, European hair, remis extra bleached, color 10 / 0, length: 120 mm) were from a different batch.

[0150] The semi-permanent hair dyes used in the second series were: - Revelon Professional® NutriColor™ Filters 190 Blau (containing semi-permanent hair dye HC blue No. 16 (= dimethyl-[3-[[4-(methylamino)-9,10-dioxoanthracen-1-yl]amino]propyl]-propylazanium bromide)); - Revelon Professional® NutriColor™ Filters 200 Violet (containing the semi-permanent hair dye HC blue No. 16 and Basic Violet 2 (= 4-[(4-amino-3-methylphenyl)-(4-imino-3-methylcyclohexa-2,5-dien-1-ylidene)methyl]-2-methylaniline hydrochloride)); - Schwarzkopf Pillar Box Red 092 (semi-permanent hair dye containing Basic Orange 31 (= 2-[(4-aminophenyl)azo]-1,3-dimethyl-1H-imidazolium chloride) and Basic Red 51 (= 2-((4-(dimethylamino)phenyl)azo)-1,3-dimethyl-1H-imidazolium chloride).

[0151] In this series, the cosmetic compositions outlined in Table 11 were used.

[0152] [Table 11]

[0153] [Table 12]

[0154] [Table 13]

[0155] [Table 14]

[0156] [Table 15]

[0157] [Table 16]

[0158] [Table 17]

[0159] [Experiment Series 3: Permanent Hair Dye] [Hair dyeing with permanent hair dyes] Strands of hair (Kerling Nr. 826204 KT dicht, European human hair, recovered from excessive bleaching, color 10 / 0, length: 120 mm) (same batch as in experimental series 1) were dyed according to the instructions on the packaging of each permanent hair dye as commercially available. Schwarzkopf Brilliance Intensive Color Creme, 849 Violette Wildseide (all-in-one multi-compartment packaging (i.e., a color cream component containing 6-methoxy-2-methylamino-3-aminopyridine (a primary intermediate agent) and 4-amino-2-hydroxytoluene (a color coupling agent); and a developer component containing hydrogen peroxide (an oxidizing agent)); or Schwarzkopf Brilliance Intensive Color Creme, 872 Intensivrot (all-in-one multi-compartment package (i.e., a color cream component containing 2,5-diaminotoluene sulfate 1-hydroxyethyl 4,5-diaminopyrazole sulfate (primary intermediate agent) and 2-amino-3-hydroxytoluene, 2-amino-3-hydroxytoluene (=2-amino-5-hydroxytoluene) (color coupling agent); and a color developer component containing hydrogen peroxide (oxidizing agent), or Schwarzkopf Brilliance Intensive Color Creme, 867 Mahagoni-Braun (all-in-one multi-compartment package (i.e., color cream component containing toluene 2,5-diamine sulfate (primary intermediate agent), 2-amino-3-hydroxypyridine, 2,7-naphthalenediol, 2-methylresorcinol (color coupling agent); and developer component containing hydrogen peroxide (oxidizer))

[0160] The entire contents of the color cream ingredients were placed in the developer bottle containing the oxidizer and shaken until the composition was thoroughly mixed. The entire bottle of composition was then quickly applied to the hair, ensuring even distribution. The color was then left on the hair for 30-45 minutes. After the exposure time (30-45 minutes), the hair tresses were rinsed with warm water (38°C) until the water was colorless. The conditioner included in the package was then applied to the hair tresses and left for 2 minutes. The conditioner was then rinsed out in 38°C water for 30 seconds. The hair tresses were then allowed to dry at room temperature overnight.

[0161] The hair tresses were cut into alternating 1.0 cm widths. Three tresses were prepared for each test.

[0162] Using the color measurement method described below under "Color Measurement," measure the color of the dyed hair strands and determine the initial L * , a * b * The value (i.e., "after 0 cycles") was determined.

[0163] [Shampoo / conditioning for permanently dyed hair] For each shampoo / conditioning cycle, the dyed hair tresses were washed with 0.5 ml of shampoo per tress according to the composition in Table 1 for 30 seconds, followed by rinsing with warm water (38°C) for 30 seconds. Then, 0.5 ml of each conditioner (see Table 2 for composition) was applied to each tress, the conditioner was left on the tress for 2 minutes, and then rinsed with warm water (38°C) for 30 seconds. This procedure was repeated nine times, resulting in the tresses being shampooed, washed, and conditioned a total of 10 times for each shampoo / conditioning cycle. At the end of each shampoo / conditioning cycle, the tresses were allowed to dry overnight at room temperature.

[0164] [Color Measurement] L of hair bundle * a * b *Values were measured before the first shampoo / conditioning cycle (i.e., "after 0 cycles") and after each shampoo / conditioning cycle (i.e., "after 1 cycle," "after 2 cycles," etc.) using a Konica Minolta-CM 600d color measuring device. Each of the three hair tresses was placed side by side and measured using a L * a * b * The values were measured 25 times and the average values are reported in Tables 18, 20 and 22. The ΔL values shown in Tables 19, 21 and 23 * , Δa * , Δb * , ΔE * The color change, denoted as *, is calculated from the initial value and the color measurement after each shampoo / conditioning cycle.

[0165] The results in Tables 3-23 demonstrate that the hair care compositions of the present invention (i.e., 1, 2, 3, and 4) exhibit significantly greater color fastness on hair dyed with semi-permanent and permanent hair dyes compared to the comparative hair care compositions (i.e., Ref. 1, Ref. 2, Ref. 3, and Ref. 4). Such improved color fastness is highly advantageous to the end consumer, as the hair color remains visually more constant for a longer period of time, thereby extending the time period before the next hair coloring is required.

[0166] [Table 18]

[0167] [Table 19]

[0168] [Table 20]

[0169] [Table 21]

[0170] Table 22

[0171] Table 23

Claims

1. a mixture of branched and linear saturated C15-C19 alkanes; - esters of fatty acids and dextrin; - cationic emulsifiers and wherein the amount of branched saturated C15 to C19 alkane in said mixture of branched and straight-chain saturated C15 to C19 alkanes is greater than 80% by weight, preferably greater than 90% by weight, and most preferably greater than 92% by weight, based on the weight of said mixture of branched and straight-chain saturated C15 to C19 alkanes.

2. 2. A hair care composition according to claim 1, characterized in that the amount of linear saturated C15-C19 alkanes in said mixture of branched and linear saturated C15-C19 alkanes is less than 10% by weight, preferably less than 8% by weight, most preferably more than 5% by weight, based on the weight of said mixture of branched and linear saturated C15-C19 alkanes.

3. 3. A hair care composition according to claim 1 or 2, characterized in that the amount of branched saturated C18 alkane is more than 50% by weight, preferably more than 60% by weight, and even more preferably more than 70% by weight, relative to the weight of said mixture of branched and linear saturated C15-C19 alkanes.

4. 4. A hair care composition according to any one of claims 1 to 3, characterized in that the fatty acid of the ester of a fatty acid with a dextrin is a C14 to C18 fatty acid, in particular a linear C14 to C18 fatty acid, most preferably palmitic acid.

5. 5. The hair care composition according to claim 1, wherein the dextrin of the ester of a fatty acid and a dextrin has an average degree of glycopolymerization of 3 to 20, in particular 8 to 16.

6. 6. A hair care composition according to any one of claims 1 to 5, characterized in that the ester of fatty acid with dextrin has an average number of esterified hydroxyl groups per glucose unit greater than 2.5, preferably between 2.5 and 3.5, more preferably between 2.5 and 3.4, most preferably between 2.5 and 3.

2.

7. The ester of fatty acid and dextrin has a molecular weight M of 8,000 to 16,000 Da, preferably 9,000 to 13,000 Da, more preferably 10,000 to 11,500 Da. ｎ The hair care composition according to any one of claims 1 to 6, characterized in that it has

8. A hair care composition according to any one of claims 1 to 7, characterized in that the cationic emulsifier is an organic ammonium compound, in particular a quaternary ammonium compound.

9. The hair care composition according to any one of claims 1 to 8, wherein the cationic emulsifier is a substance defined by a CAS number selected from the group consisting of [17301-53-0], [92201-88-2], [1156505-34-8], and [51277-96-4].

10. 10. A hair care composition according to any one of claims 1 to 9, characterized in that the amount of cationic emulsifier is in the range of 0.5 to 10 wt.-%, in particular 0.5 to 8 wt.-%, preferably 1 to 6 wt.-%, based on the weight of the hair care composition.

11. 11. A hair care composition according to any one of claims 1 to 10, characterized in that the amount of the mixture of branched and linear saturated C15-C19 alkanes is in the range of 0.015 to 12.0 wt.-%, in particular 0.5 to 11.0 wt.-%, preferably 1.0 to 10.0 wt.-%, more preferably 1.5 to 8.0 wt.-%, even more preferably 2.0 to 6.0 wt.-%, based on the weight of the hair care composition.

12. The hair care composition according to any one of claims 1 to 11, which is a hair conditioner.

13. The hair care composition according to any one of claims 1 to 12, which does not contain an anionic surfactant or a nonionic surfactant.

14. Use of a mixture of branched and straight-chain saturated C15-C19 alkanes in combination with an ester of a fatty acid and dextrin and a cationic emulsifier to enhance the color fastness of a hair dye applied to hair.

15. 15. Use according to claim 14, characterized in that the hair dye is a semi-permanent hair dye.

16. 15. Use according to claim 14, characterized in that the hair dye is a permanent hair dye.

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