Hair dyeing composition comprising blue dye

Abstract

The present invention relates to a dyeing composition for keratin fibers, comprising one or more alkalizing agents, HC blue 18 and / or its salts, tetrabromophenol blue and / or its salts. The present invention discloses a two-part composition, a kit and a dyeing method.

Description

Technical Field

[0001] The present invention relates to a dyeing composition, a kit and a dyeing process for keratin fibers, preferably human keratin fibers, more preferably human hair. Background Art

[0002] Direct dyes have been of particular interest to the cosmetics industry over the past decade. Compared to their oxidative counterparts, direct dyes are easier to apply to keratin fibers but tend to lack vibrancy, color intensity, and color stability over time.

[0003] The applicant has developed new direct dyes (EP1366752) that complement the availability and color range of existing dyes. One of the dyes developed above is HC Blue 18.

[0004] Due to its phenolic structure, the color of HC Blue 18 depends on pH. At low pH (protonated form), it appears light beige, while at high pH (deprotonated form), it appears bright bluish-violet. However, consumers expect their hair color to remain stable over a wide pH range.

[0005] However, most hair care products have a pH range of 4 to 6, which overlaps with the point at which HC Blue 18 exhibits color shift. Therefore, if a consumer chooses a hair care product with a pH that is too low, the blue dye will lose its color, shifting to a beige hue, and the hair will lose its color depth. Needless to say, such a shift can be very disappointing and unwelcome to the customer.

[0006] In addition to the issue of hair care product selection, a portion of consumers have scalps that produce sebum with a lower pH than normal skin. Consequently, these consumers' dyed roots are prone to undesirable color shifts, while the lengths remain their originally desired artificial color.

[0007] In conclusion, there is a real need to develop dyeing compositions for keratin fibres which produce stable colours over a wide pH range while remaining stable over long storage times.The prior art has not addressed this problem satisfactorily. Summary of the Invention

[0008] Therefore, a first object of the present invention is a dyeing composition for keratin fibers, preferably for human keratin fibers, more preferably for human hair, comprising:

[0009] a) one or more alkalizing agents;

[0010] b) HC Blue 18 and / or its salts;

[0011] c) Tetrabromophenol blue and / or its salts.

[0012] A second object of the present invention is a kit comprising:

[0013] - a first composition comprising a compound according to a) and a compound according to b) as defined above;

[0014] - a second aqueous composition having a pH in the range from 7 to 12 and comprising a compound according to a) and a compound according to c) as defined above; and

[0015] - a third aqueous composition having a pH in the range of 1 to 6 and optionally comprising one or more oxidizing agents.

[0016] A second object of the present invention is a two-part dyeing composition comprising a first composition as defined above and a second aqueous composition having a pH ranging from 1 to 6 and optionally comprising one or more oxidizing agents.

[0017] A third object of the present invention is a method for dyeing keratin fibers, preferably human keratin fibers, more preferably human hair, comprising the following steps:

[0018] i) mixing a dyeing composition as defined above with a second aqueous composition as defined above for a two-part composition, so as to obtain a ready-to-use composition having a pH in the range from 7 to 12;

[0019] ii) applying the ready-to-use composition to the keratin fibers and leaving it on for a period of time ranging from 1 minute to 60 minutes;

[0020] iii) rinsing the keratin fibers and optionally washing the keratin fibers with a shampoo. DETAILED DESCRIPTION

[0021] The inventors of the present invention have surprisingly discovered that the combination of HC Blue 18 and another blue dye, tetrabromophenol blue, produces highly stable color results over a wide pH range. The combination of the two dyes produces a bright, intense, and stable color on keratin fibers. Neither dye, used alone, can simultaneously provide both brightness and pH stability. Furthermore, the dyeing composition exhibits very good storage stability over time.

[0022] Dyeing composition

[0023] The present invention relates to a dyeing composition for keratin fibers, preferably for human keratin fibers, more preferably for human hair, comprising:

[0024] a) one or more alkalizing agents;

[0025] b) HC Blue 18 and / or its salts;

[0026] c) Tetrabromophenol blue and / or its salts.

[0027] Compound according to a)

[0028] The composition according to the invention comprises one or more alkalizing agents as compounds according to a).

[0029] From the viewpoint of providing alkalinity and cosmetic safety, it is preferred that the one or more compounds according to a) are one or more organic alkalizing agents and / or ammonia and / or salts thereof.

[0030] From the viewpoint of providing alkalinity and cosmetic safety as well as their low odor, the one or more organic alkalizing agents are preferably selected from alkylamines and / or alkanolamines and / or their salts, more preferably selected from monoethanolamine, diethanolamine, monoethanolmethylamine, monoethanoldimethylamine, diethanolmethylamine, monoethanolethylamine, monoethanoldiethylamine, diethanolethylamine, monoethanolpropylamine, monoethanoldipropylamine, diethanolpropylamine, monoethanolbutylamine, diethanolbutylamine, trimethylamine, triethylamine, 2-amino-2-methylpropanol, tris(hydroxymethyl)-aminomethane, and / or their salts, and / or their mixtures.

[0031] From the perspective of providing alkalinity and cosmetic safety, the most preferred alkalizing agent is selected from monoethanolamine, 2-amino-2-methylpropanol, tris-(hydroxymethyl)-aminomethane and / or its salts, ammonia and / or its salts, and / or mixtures thereof.

[0032] In one aspect of the present invention, from the perspective of storage stability, one or more compounds according to group a) may be suitable as one or more inorganic alkalizing agents, preferably selected from metasilicates, carbonates, and / or bicarbonates, and / or alkali metal salts or alkaline earth metal salts thereof, and / or mixtures thereof, preferably sodium metasilicate.

[0033] From the perspective of providing alkalinity, the total concentration of the compounds according to a), preferably the total concentration of one or more alkanolamines and / or salts thereof and / or ammonia and / or salts thereof, is preferably 0.1 wt % or more, more preferably 0.25 wt % or more, and even more preferably 0.5 wt % or more, based on the total weight of the composition.

[0034] From the viewpoint of providing alkalinity, hair damage and odor, the total concentration of the compounds according to a), preferably the total concentration of one or more alkanolamines and / or salts thereof and / or ammonia and / or salts thereof, is preferably 40 wt % or less, more preferably 30 wt % or less, and even more preferably 25 wt % or less, based on the total weight of the composition.

[0035] In order to achieve the above-mentioned effects, the total concentration of the compounds according to a), preferably the total concentration of one or more alkanolamines and / or salts thereof and / or ammonia and / or salts thereof, is preferably in the range of 0.1 wt % to 40 wt %, preferably in the range of 0.25 wt % to 30 wt %, more preferably in the range of 0.5 wt % to 25 wt %, calculated on the total weight of the composition.

[0036] Compounds according to b)

[0037] The dyeing composition of the invention comprises HC Blue 18 and / or its salts as compound according to b).

[0038] From the viewpoint of color intensity, the total concentration of the compounds according to b) is preferably 0.001 wt% or more, more preferably 0.005 wt% or more, and even more preferably 0.01 wt% or more, based on the total weight of the composition.

[0039] From the viewpoint of color intensity and economic reasons, the total concentration of the compounds according to b) is preferably 10% by weight or less, more preferably 5% by weight or less, even more preferably 1% by weight or less, even more preferably 0.75% by weight or less, calculated on the total weight of the composition.

[0040] In order to achieve the above-mentioned effects, the total concentration of the compounds according to b) is preferably in the range of 0.001 wt % to 10 wt %, preferably in the range of 0.005 wt % to 5 wt %, more preferably in the range of 0.01 wt % to 1 wt %, and even more preferably in the range of 0.01 wt % to 0.75 wt %, calculated based on the total weight of the composition.

[0041] Compounds according to c)

[0042] The dyeing composition of the present invention comprises tetrabromophenol blue and / or its salt as compound according to c).

[0043] From the viewpoint of color intensity, the total concentration of the compounds according to c) is preferably 0.001 wt% or more, more preferably 0.01 wt% or more, and even more preferably 0.02 wt% or more, based on the total weight of the composition.

[0044] From the viewpoint of color intensity and economic reasons, the total concentration of the compounds according to c) is preferably 10 wt.-% or less, more preferably 5 wt.-% or less, even more preferably 1 wt.-% or less, even more preferably 0.5 wt.-% or less, calculated on the total weight of the composition.

[0045] In order to achieve the above-mentioned effects, the total concentration of the compounds according to c) is preferably in the range of 0.001 wt % to 10 wt %, preferably in the range of 0.01 wt % to 5 wt %, more preferably in the range of 0.02 wt % to 1 wt %, and even more preferably in the range of 0.02 wt % to 0.5 wt %, calculated based on the total weight of the composition.

[0046] From the viewpoint of color stability and color intensity in a wide pH range, it is further preferred that the weight ratio of the compound according to c) to the compound according to b) is in the range of 0.1 or more, more preferably 0.5 or more, further more preferably 0.8 or more, further more preferably 5 or more.

[0047] From the viewpoint of color stability and color intensity in a wide pH range, it is further preferred that the weight ratio of the compound according to c) to the compound according to b) is in the range of 200 or less, more preferably 160 or less, further more preferably 140 or less, further more preferably 100 or less, further more preferably 50 or less.

[0048] In order to obtain the above-mentioned effects, the weight ratio of the compound according to c) to the compound according to b) is preferably in the range of 0.1 to 200, preferably in the range of 0.5 to 160, more preferably in the range of 0.8 to 140, further more preferably in the range of 5 to 100, further more preferably in the range of 5 to 50.

[0049] Cosmetic form of the composition

[0050] The dyeing composition of the present invention is available in various cosmetic forms.

[0051] Aqueous composition

[0052] In one aspect of the invention, the dyeing composition is an aqueous composition.

[0053] The term "aqueous" refers to a composition comprising a majority of water, i.e., from the perspective of obtaining a cosmetically acceptable composition, the composition preferably comprises 50% by weight or more, further more preferably 60% by weight or more, still more preferably 70% by weight or more, still further more preferably 80% by weight or more of water, calculated on the total weight of the composition.

[0054] From the viewpoint of dyeing strength, it is further preferred that the composition contains 98% by weight or less, more preferably 95% by weight or less, and even more preferably 92% by weight or less of water, based on the total weight of the composition.

[0055] In order to obtain the above-mentioned effects, the total concentration of water is preferably in the range of 50 wt % to 98 wt %, more preferably in the range of 60 wt % to 95 wt %, further more preferably in the range of 70 wt % to 92 wt %, and still more preferably in the range of 80 wt % to 92 wt %, based on the total weight of the composition.

[0056] From the viewpoint of dyeing performance, the pH of the aqueous composition is preferably 7 or higher, more preferably 7.5 or higher, further more preferably 8 or higher, and still further more preferably 9 or higher.

[0057] From the viewpoint of hair damage and dyeing performance, the pH of the composition is preferably 12 or lower, more preferably 11 or lower, and still more preferably 10.5 or lower.

[0058] In order to obtain the above-mentioned effects, the pH value of the aqueous dyeing composition is preferably in the range of 7 to 12, preferably in the range of 7.5 to 11, more preferably in the range of 8 to 10.5, and further more preferably in the range of 9 to 10.5.

[0059] Therefore, the present disclosure also relates to an aqueous dyeing composition for keratin fibers, preferably for human keratin fibers, more preferably for human hair, having a pH in the range of 7 to 12, preferably in the range of 7.5 to 11, more preferably in the range of 8 to 10.5, even more preferably in the range of 9 to 10.5, and comprising:

[0060] a) one or more alkalizing agents;

[0061] b) HC Blue 18 and / or its salts;

[0062] c) tetrabromophenol blue and / or its salts,

[0063] The composition comprises more than 50% by weight of water based on the total weight of the composition.

[0064] Liquid compositions comprising less than 1% by weight of water

[0065] In another aspect of the present invention, the dyeing composition is a composition that is liquid at 25° C. and atmospheric pressure, comprising one or more organic solvents as the compound according to d) and containing less than 1% by weight of water, based on the total weight of the composition. From the perspective of dye stability, the composition is preferably anhydrous.

[0066] The term "liquid" refers to the physical state at 25°C and atmospheric pressure, ie the dyeing composition is liquid at room temperature.

[0067] The term "anhydrous" refers to compositions that do not contain added water. This does not exclude the presence of residual moisture from the air or water of crystallization associated with the ingredients.

[0068] For this aspect of the invention, the composition may comprise one or more organic solvents as compounds according to d).

[0069] The organic solvent can be selected to dissolve compounds a) to c). Preferred solvents are monohydric, dihydric and trihydric alcohols and / or mixtures thereof.

[0070] From the viewpoint of cosmetic safety and solvency, preferred monohydric, dihydric and trihydric alcohols are ethanol, n-propanol, isopropanol, propylene glycol, ethylene glycol, benzyl alcohol, phenoxyethanol and glycerol, and / or mixtures thereof.

[0071] From the viewpoint of solution stability, the total concentration of the compounds according to d) is more preferably 75 wt % or more, more preferably 80 wt % or more, and even more preferably 85 wt % or more, based on the total weight of the composition.

[0072] From the viewpoint of dyeing strength, it is further preferred that the total concentration of the compounds according to d) is 98 wt% or less, more preferably 95 wt% or less, and even more preferably 92 wt% or less, based on the total weight of the composition.

[0073] In order to achieve the above-mentioned effects, the total concentration of the compounds according to d) is preferably in the range of 75 wt % to 98 wt %, more preferably in the range of 80 wt % to 95 wt %, and even more preferably in the range of 85 wt % to 92 wt %, based on the total weight of the composition.

[0074] Therefore, the present disclosure also relates to an anhydrous dyeing composition for keratin fibers, preferably for human keratin fibers, more preferably for human hair, comprising:

[0075] a) one or more alkalizing agents;

[0076] b) HC Blue 18 and / or its salts;

[0077] c) tetrabromophenol blue and / or its salts;

[0078] d) one or more organic solvents,

[0079] Wherein, the total concentration of the compounds according to d) is greater than 75 wt % based on the total weight of the composition.

[0080] Powder composition

[0081] In one aspect of the present invention, the dyeing composition may be a powder composition.

[0082] The term "powder" refers to a composition that is solid at 25°C and atmospheric pressure. This term relates to free-flowing powders as well as compressed powders such as tablets. Powder compositions may also contain water, as long as their solid state at 25°C is not altered. Depending on the type of powder, a water content of 10% by weight or more, calculated on the total weight of the composition, is acceptable. This does not exclude the presence of residual moisture from the air or water of crystallization bound to the ingredients.

[0083] From the viewpoint of composition stability and ease of use, it is preferred that the dyeing composition comprises one or more powdered excipients as the compound according to e).

[0084] The term "excipient" refers to a compound which acts as a filler material and dispersant for the other compounds of the dyeing composition and which does not react with the dye and the alkalizing agent, thereby making the powder highly storage stable over a long period of time.

[0085] The dyeing composition of the present invention may comprise an organic and / or inorganic powdered vehicle in which the alkalizing agent and the direct dye are dispersed.

[0086] Suitable organic and / or inorganic pulverulent excipients are, for example, diatomaceous earth, kaolin, bentonite, starch, in particular corn starch, tapioca starch, rice starch, wheat starch and potato starch, nylon powder, montmorillonite, gypsum, sawdust and perlite.

[0087] From the perspective of achieving good dispersibility of the direct dye in the powder and rapid dissolution of the powder, the total concentration of the organic and / or inorganic powdered excipients, calculated based on the total weight of the composition, is preferably 50 wt % or more, more preferably 55 wt % or more, further more preferably 60 wt % or more, still further more preferably 65 wt % or more, even further more preferably 70 wt % or more, even more preferably 75 wt % or more.

[0088] From the perspective of achieving good dispersibility and formulation freedom of the direct dye in the powder, the total concentration of the organic and / or inorganic powdered excipients, calculated based on the total weight of the composition, is preferably 98 wt % or less, more preferably 95 wt % or less, and even more preferably 90 wt % or less.

[0089] In order to obtain the above-mentioned effects, the total concentration of the organic and / or inorganic powdered excipients is preferably in the range of 50 wt % to 98 wt %, more preferably in the range of 55 wt % to 95 wt %, further more preferably in the range of 60 wt % to 90 wt %, still further more preferably in the range of 65 wt % to 90 wt %, still further more preferably in the range of 70 wt % to 90 wt %, even more preferably in the range of 75 wt % to 90 wt %.

[0090] Therefore, the present disclosure also relates to a dyeing composition for keratin fibers, preferably for human keratin fibers, more preferably for human hair, comprising:

[0091] a) one or more alkalizing agents;

[0092] b) HC Blue 18 and / or its salts;

[0093] c) tetrabromophenol blue and / or its salts;

[0094] e) one or more powdered excipients,

[0095] wherein the composition is a powder composition, and

[0096] Preferably the total concentration of the compounds according to e) is above 50% by weight, calculated on the total weight of the composition.

[0097] Lipophilic compound according to f)

[0098] Preferably, the dyeing composition according to the invention comprises one or more lipophilic compounds as compounds according to f).

[0099] The term "lipophilic" refers to a compound that is liquid at 25°C and atmospheric pressure and does not completely mix with water under those conditions.

[0100] Preferably, the lipophilic compound is selected from fatty alcohols, fatty acids, waxes, vegetable oils, petrolatum-based products, silicones, aminated silicones and compounds according to the general formula:

[0101]

[0102] Among them, R1 is selected from a linear or branched saturated or unsaturated alkyl group having C11 to C21, and is optionally modified with 1 hydroxyl group, and R2 is selected from a linear or branched saturated or unsaturated alkyl group having C3 to C18, and from the perspective of film uniformity and pigment deposition, the compound is preferably ethylhexyl hydroxystearate.

[0103] Suitable fatty alcohols are linear or branched saturated or unsaturated fatty alcohols having C12 to C22 chains, such as lauryl alcohol, tridecanol, myristyl alcohol, pentadecyl alcohol, cetyl alcohol, palmitoleyl alcohol, heptadecanol, stearyl alcohol, nonadecanol, arachidyl alcohol, behenyl alcohol, and / or mixtures thereof.

[0104] Suitable fatty acids are saturated or unsaturated fatty acids with or without hydroxyl groups. Suitable are myristoleic acid, palmitoleic acid, oleic acid, linoleic acid, arachidonic acid, and / or mixtures thereof.

[0105] Suitable compounds according to the above general formula are:

[0106] Isopropyl palmitate, isopropyl myristate, octyl palmitate, isocetylpalmitate, octylstearate, oleyl oleate, ethylhexyl hydroxystearate, myristyl myristate, behenyl behenate, and / or mixtures thereof.

[0107] Suitable vegetable oils are jojoba oil, avocado oil, sunflower oil, walnut oil, peanut oil, olive oil, rapeseed oil, cottonseed oil, palm oil, sesame oil, soybean oil, coconut oil, safflower oil, almond oil, macadamia oil, grapefruit seed oil, lemon kernel oil, orange kernel oil, almond oil, castor oil, and / or mixtures thereof.

[0108] Suitable petrolatum-based products are liquid paraffins, in particular light liquid paraffin (paraffinum perliquidum) and heavy liquid paraffin (paraffinum subliquidum), and mineral oils, in particular white mineral oils, and / or mixtures thereof.

[0109] Suitable silicones are polydimethylsiloxanes and modified silicones (e.g., amino-modified silicones, fluorine-modified silicones, alcohol-modified silicones, polyether-modified silicones, epoxy-modified silicones or alkyl-modified silicones), but preferably polydimethylsiloxanes, polyether-modified silicones and amino-modified silicones. Amino-modified silicones are generally known by their CTFA name amodimethicone.

[0110] Specific examples of suitable commercially available amodimethicone include SF8452C, SS-3551 (all supplied by Dow Corning Toray Co., Ltd.), KF-8004, KF-867S and KF-8015 (all supplied by Shin-Etsu Chemical Co., Ltd.), and amodimethicone emulsions such as SM8704C, SM8904, BY22-079, FZ-4671 and FZ-4672 (all supplied by Dow Corning Toray Co., Ltd.).

[0111] The amino-modified silicone may be any silicone having an amino group or a quaternary ammonium group, and examples thereof include amine-modified silicone oils having all or part of the terminal hydroxyl groups blocked, for example, with methyl groups, and amino-terminated polydimethylsiloxanes having no block.

[0112] The composition may comprise one or more waxes. Suitable non-limiting and preferred examples are petrolatum, ozokerit, carnauba wax, paraffin wax, lanolin wax, candelilla wax, beeswax, microcrystalline wax and cocoglycerides.

[0113] From the perspective of dyeing strength, the dyeing composition may contain the lipophilic compound according to f) in an amount preferably not less than 0.1 wt %, more preferably not less than 0.5 wt %, and even more preferably not less than 1 wt %, based on the total weight of the composition.

[0114] From the perspective of dyeing strength and rinsability of keratin fibers, the dyeing composition may contain the lipophilic compound according to f) in an amount preferably less than 40% by weight, more preferably less than 30% by weight, and even more preferably less than 25% by weight, calculated on the total weight of the composition.

[0115] In order to achieve the above-mentioned effects, the dyeing composition preferably contains the lipophilic compounds according to f) in a total concentration in the range of 0.1 wt % to 40 wt %, more preferably in the range of 0.5 wt % to 30 wt %, and even more preferably in the range of 1 wt % to 25 wt %, calculated on the total weight of the composition.

[0116] In one aspect of the present invention, the present disclosure also relates to an aqueous dyeing composition for keratin fibers, preferably for human keratin fibers, more preferably for human hair, having a pH in the range of 7 to 12, preferably in the range of 7.5 to 11, more preferably in the range of 8 to 10.5, even more preferably in the range of 9 to 10.5, and comprising:

[0117] a) one or more alkalizing agents;

[0118] b) HC Blue 18 and / or its salts;

[0119] c) tetrabromophenol blue and / or its salts,

[0120] wherein, based on the total weight of the composition, the composition comprises more than 50% by weight of water, and

[0121] The composition is an emulsion and comprises one or more compounds according to f) selected from branched or linear saturated or unsaturated fatty alcohols with a carbon chain length in the range of C12 to C22, branched or linear saturated or unsaturated fatty acids with a carbon chain length in the range of C12 to C22, ester oils, vegetable oils, silicone oils, paraffin oils.

[0122] In another aspect of the present invention, the present disclosure also relates to a dyeing composition for keratin fibers, preferably for human keratin fibers, more preferably for human hair, comprising:

[0123] a) one or more alkalizing agents;

[0124] b) HC Blue 18 and / or its salts;

[0125] c) tetrabromophenol blue and / or its salts;

[0126] e) one or more powdered excipients,

[0127] wherein the composition is a powder composition, and

[0128] wherein the total concentration of the compounds according to e) is preferably 50% by weight or more, calculated based on the total weight of the composition, and

[0129] The composition comprises one or more lipophilic compounds according to f), preferably with a total concentration of 1% by weight or more.

[0130] Those skilled in the art will note that the latter composition is a dust-free dyeing powder or dyeing paste.

[0131] Surfactants as compounds according to g)

[0132] From the standpoint of the mixability of the dyeing composition and the wettability of the keratin fibers, it is further preferred that the composition according to the invention further comprises one or more surfactants as compounds according to g), more preferably selected from nonionic surfactants, cationic surfactants, anionic surfactants, zwitterionic surfactants / amphoteric surfactants.

[0133] Suitable anionic surfactants are in principle the anionic surfactants known from cleaning compositions. These are anionic surfactants of the sulfate, sulfonate, carboxylate and alkylphosphate type, for example the known C 10 -C 18 Alkyl sulfates, especially the respective ether sulfates, such as C 12 -C 14 Alkyl ether sulfates, especially lauryl ether sulfates having 1 to 4 ethylene oxide groups in the molecule, monoglyceride (ether) sulfates, fatty acid amide sulfates obtained by ethoxylation and subsequent sulfation of fatty acid alkanolamides, and alkali metal salts thereof, and salts of long-chain mono- and dialkyl phosphates. Preferred anionic surfactants are alkyl sulfate surfactants, especially lauryl sulfate and its salts.

[0134] Other suitable surfactants are nonionic surfactants. Non-limiting examples are long-chain fatty acid mono- and di-alkanolamides (e.g. coconut fatty acid mono- or di-ethanolamide and myristic fatty acid mono- or di-ethanolamide, stearic acid mono- or di-ethanolamide), alkyl polyglucosides having an alkyl group of 8 to 18 carbon atoms and having 1 to 5 glucoside units, sorbitan esters (e.g. polyethylene glycol sorbitan stearate, palmitate, myristate and laurate), fatty acid polyglycol esters or polycondensates of ethylene oxide and propylene oxide (e.g., commercially available under the trade name "PluronicsR ”), and fatty alcohol ethoxylates, C 10 -C 22 Fatty alcohol ethoxylates (known according to the CTFA nomenclature by the general terms "Laureth", "Myristeth", "Oleth", "Ceteth", "Deceth", "Steareth" and "Ceteareth", including the number of added ethylene oxide molecules, for example "Laureth-16": the average degree of ethoxylation is therefore between about 2.5 and about 100, preferably between about 10 and about 30).

[0135] Suitable amphoteric / zwitterionic surfactants are, in particular, the various known betaines, such as alkylbetaines, fatty acid amide alkylbetaines and sultaines, for example lauryl hydroxysultaine; long-chain alkylamino acids, for example cocoaminoacetate, cocoaminopropionate and sodium cocoamphopropionate and sodium cocoamphoacetate are also suitable.

[0136] Typical cationic surfactants are cetyltrimonium chloride, stearyltrimonium chloride, dipalmitoyldimonium chloride, distearyldimonium chloride, stearamidopropyltrimonium chloride, dioleoethyldimethylammonium methosulfate, dioleoethylhydroxyethylammonium methosulfate.

[0137] From the viewpoint of composition stability, wettability of keratin fibers and dispersibility of ingredients, the total concentration of the compounds according to g) is preferably 0.1 wt % or more, preferably 0.2 wt % or more, and even more preferably 0.25 wt % or more, based on the total weight of the composition.

[0138] From the viewpoint of composition stability, wettability of keratin fibers and dispersibility of ingredients, the total concentration of the compounds according to g) is preferably 5 wt % or less, preferably 4 wt % or less, and even more preferably 2.5 wt % or less, calculated based on the total weight of the composition.

[0139] In order to achieve the above-mentioned effects, the total concentration of the compounds according to g) is preferably in the range of 0.1 wt % to 5 wt %, more preferably in the range of 0.2 wt % to 4 wt %, and even more preferably in the range of 0.2 wt % to 2.5 wt %, based on the total weight of the composition.

[0140] Dyes other than b) and c)

[0141] The dyeing composition of the invention may comprise one or more dyeing compounds different from groups b) and c), preferably selected from oxidation dye precursors, oxidation dye couplers and / or direct dyes.

[0142] Suitable oxidation dye precursors are p-phenylenediamine, p-aminophenol and heterocyclic compounds such as diaminopyrazoles and substituted pyrimidines, and suitable color-forming substances are resorcinol, m-aminophenol, m-phenylenediamine, pyridine and substituted derivatives, and naphthol.

[0143] Suitable oxidation dye couplers are 5-amino-2-methylphenol, 2-methyl-5-hydroxyethylaminophenol, 2,4-diaminophenoxyethanol, 2-amino-4-hydroxyethylaminoanisole, 2-methyl-5-amino-6-chlorophenol, 1,3-bis(2,4-diaminophenoxy)propane, 2-bis(2-hydroxyethyl)aminotoluene, 2-amino-5-methylphenol, resorcinol, 2-methylresorcinol, 4-chlororesorcinol, 2-amino-4-chlorophenol, 5-amino-4-methoxy-2-methylphenol, 2-aminophenol, 3-aminophenol, 1-methyl-2-hydroxy-4-aminobenzene, 3-N,N-dimethylaminophenol, 2,6-dihydroxy-3,5-dimethoxypyridine, 5-amino 1,2-dihydroxynaphthalene, 4-hydroxy-1,2-methyldioxybenzene, 2,4-diamino-3-chlorophenol, 5-amino-2-methoxyphenol and / or 1-methoxy-2-amino-4-(2'-hydroxyethylamino)benzene, and / or salts thereof and / or mixtures thereof.

[0144] The dyeing composition of the present invention may comprise oxidation dye couplers and / or precursors in approximately equimolar proportions, for example in a total concentration ranging from 0.001 to 5% by weight, based on the total weight of the composition.

[0145] The direct dyes other than the compounds according to groups b) and c) may be chosen from cationic direct dyes, anionic direct dyes and / or nonionic direct dyes.

[0146] From the perspective of sufficiently dyeing keratin fibers, the total concentration of one or more direct dyes other than the compounds according to groups b) and c) in the composition of the present invention, if present, is preferably 0.01% by weight or more, more preferably 0.05% by weight or more, even more preferably 0.1% by weight or more, calculated on the total weight of the composition.

[0147] For economic reasons and from the standpoint of formulation freedom, the total concentration of one or more direct dyes other than the compounds according to groups b) and c) in the composition of the invention, if present, is preferably 10% by weight or less, more preferably 9% by weight or less, further more preferably 7.5% by weight or less, further more preferably 6% by weight or less, even more preferably 4% by weight or less, calculated on the total weight of the composition.

[0148] In order to achieve the above-mentioned effects, the total concentration of one or more direct dyes other than the compounds according to groups b) and c) in the composition of the present invention, if present, is in the range of 0.01% to 10% by weight, preferably in the range of 0.05% to 9% by weight, more preferably in the range of 0.1% to 7.5% by weight, further more preferably in the range of 0.1% to 6% by weight, even more preferably in the range of 0.1% to 4% by weight, calculated on the total weight of the composition.

[0149] Thickening polymers

[0150] From the perspective of cosmetic safety, it is advantageous that the composition of the present invention further comprises one or more thickening polymers.

[0151] Preferably, the thickening polymer is chosen from polymers that form aqueous solutions and / or dispersions having a pH between 8 and 10 and have a viscosity of at least 5,000 mPa·s in water at 25° C. at a polymer concentration of 1% by weight, calculated on the total weight of the composition, as measured by a Brookfield viscometer, for example at 10 rpm for 1 minute, at 25° C. using a suitable spindle.

[0152] Suitable nonionic thickening polymers are cellulose-based polymers. Suitable examples of cellulose-based polymers are methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxyethylmethylcellulose and alkylated hydroxycelluloses, such as (C2-C8)-alkylcellulose or cetylhydroxyethylcellulose.

[0153] Suitable anionic thickening polymers are selected from natural anionic polymers and / or synthetic anionic polymers.

[0154] Suitably, the natural anionic polymer may be selected from xanthan gum, dehydrogenated xanthan gum, hydroxypropyl xanthan gum, carboxymethyl cellulose, and starch-based polymers such as plant starch and / or their synthetically modified derivatives such as hydroxypropyl starch phosphate. Also suitable are alginic acid, sodium alginate, ammonium alginate, calcium alginate, gum arabic and guar gum.

[0155] From the viewpoint of their biodegradability and low environmental impact, preferred thickening polymers for the composition of the present invention are natural anionic polymers, more preferably xanthan gum and / or dehydroxanthan gum.

[0156] From the perspective of providing sufficient viscosity to the composition, the total concentration of the thickening polymer of the present invention is preferably 0.1 wt% or more, more preferably 0.25 wt% or more, and even more preferably 0.5 wt% or more, based on the total weight of the composition.

[0157] From the perspective of providing sufficient viscosity to the composition and commodity cost, the total concentration of the thickening polymer of the present invention is preferably 15 wt% or less, more preferably 12 wt% or more, and even more preferably 10 wt% or less, calculated based on the total weight of the composition.

[0158] In order to achieve the above-mentioned effects, the total concentration of the thickening polymer in the composition of the present invention is preferably in the range of 0.1 wt % to 15 wt %, preferably in the range of 0.25 wt % to 12 wt %, more preferably in the range of 0.5 wt % to 10 wt %, calculated based on the total weight of the composition.

[0159] Two-part composition

[0160] The present invention also relates to a two-part dyeing composition comprising:

[0161] - a first composition as described above; and

[0162] - a second aqueous composition having a pH in the range of 1 to 6 and optionally comprising one or more oxidizing agents.

[0163] The second aqueous composition preferably comprises hydrogen peroxide as an oxidizing agent, preferably in a concentration range of 0.1 to 20 wt %, preferably 0.25 to 15 wt %, more preferably 0.5 to 12 wt %, based on the total weight of the second aqueous composition.

[0164] The pH of the second aqueous composition is preferably adjusted by appropriate acid and base in the range of 1.5 to 5, more preferably in the range of 2 to 4.5.

[0165] From the perspective of miscibility with the first composition, it is further preferred that the second aqueous composition comprises one or more lipophilic compounds according to f), as described above for the dyeing composition. In this case, the second aqueous composition is an emulsion and preferably further comprises one or more surfactants as compounds according to g), as described above for the dyeing composition.

[0166] The first and second compositions of this aspect of the invention are intended to be mixed directly before application to the keratin fibres.

[0167] Kit

[0168] The present invention also relates to a kit comprising:

[0169] - a first composition comprising a compound according to a) and a compound according to b) as defined above;

[0170] - a second aqueous composition having a pH in the range from 7 to 12 and comprising a compound according to a) and one or more compounds according to c) as defined above; and

[0171] - a third aqueous composition having a pH in the range of 1 to 6 and optionally comprising one or more oxidizing agents.

[0172] For this aspect of the invention it is preferred that the first composition is an anhydrous liquid composition as defined above, but does not contain a compound according to c).Apart from the latter fact, the above disclosure also relates to a first anhydrous composition.

[0173] For this aspect of the invention, it is preferred that the second aqueous composition is an aqueous dyeing composition as defined above, but does not contain the compound according to b). Alternatively, the compound according to a) may be present. The above disclosure also relates to the second aqueous composition in addition to the compound according to b).

[0174] For this aspect of the invention, it is preferred that the third aqueous composition is an aqueous oxidising composition, as defined above for the second composition of the two-part composition.

[0175] The three compositions of the kit are mixed directly before application to the keratin fibers.

[0176] Dyeing method

[0177] The present invention also relates to a method for dyeing keratin fibers, preferably human keratin fibers, more preferably human hair, comprising the following steps:

[0178] i) mixing the dyeing composition as defined above with a second aqueous composition as defined above for the two-part composition to obtain a ready-to-use composition having a pH in the range of 7 to 12;

[0179] ii) applying the above-described ready-to-use composition to the keratin fibers and leaving it to remain for a period of time ranging from 1 minute to 60 minutes; and

[0180] iii) rinsing the keratin fibers and optionally washing the keratin fibers with a shampoo.

[0181] From the perspective of color intensity, it is preferred that the pH of the ready-to-use composition defined in step i) is in the range of 8 to 11, more preferably in the range of 8.5 to 10.5.

[0182] From the viewpoint of dyeing strength and dyeing process economy, it is further preferred that the residence time defined in step ii) is in the range of 2 minutes to 45 minutes, more preferably in the range of 5 minutes to 40 minutes, and even more preferably in the range of 10 minutes to 30 minutes.

[0183] The following examples are intended to illustrate the present invention but are not intended to limit the present invention.

[0184] Example

[0185] Example 1

[0186] The following dyeing compositions of Table 1 were prepared by first dissolving the alkalizing agent and then adding the dye to water. Finally, the pH was adjusted.

[0187] [Table 1]

[0188]

[0189] The above composition was then mixed with an aqueous oxidizing composition comprising 6% by weight of hydrogen peroxide and phosphoric acid in a weight ratio of 1:1 to adjust the pH to 3.5. The pH of the resulting ready-to-use composition was approximately 10.1.

[0190] The ready-to-use composition was then applied to yak keratin fibers and left on for 30 minutes at 40° C. The fibers were then rinsed with warm water, cleaned with shampoo, and blow-dried.

[0191] The dyed hair streak was then immersed in a buffer solution of pH 5.5 or 4.5 for 1 minute and then allowed to stand for an additional 5 minutes. The hair streak was then blotted dry and air-dried. ΔE*1 is the value measured on the hair streak treated with the pH 5.5 buffer solution, while ΔE*2 is the value measured on the hair streak treated with the pH 4.5 buffer solution. Colorimetric measurements were obtained using a colorimeter using the CIE colorimetric system (L*, a*, b*), and the color difference (ΔE*) was calculated using the following formula.

[0192]

[0193] The visual appearance of the pH 4.5 treated hair tresses was judged visually.

[0194] As a result, Comparative Composition 1 had the strongest color intensity (highest ΔE* value within the row) at both pH values, but also had the strongest color shift between pH 5.5 and pH 4.5. Comparative Composition 2 had the lowest color shift of all the compositions tested, but also had the lowest color intensity. The combination of dyes b) and c) resulted in better overall dyeing intensity and was much less sensitive to changes in pH from 5.5 to 4.5.

[0195] Example 2

[0196] The following compositions were prepared in the same manner as described in Example 1: the same mixing, testing and measurements were performed.

[0197] [Table 2]

[0198]

[0199] As a result, the addition of the blue dye according to c) shifted the color from red-blue to neutral blue, independent of the concentration of HC Blue 18. Furthermore, the difference between the pH 5.5 and pH 4.5 treatments became less pronounced.

[0200] Example 3

[0201] Prepare the following oxidative dyeing composition. Heat the aqueous phase, consisting of surfactant and water, to 80°C. Simultaneously, heat the lipophilic phase, consisting of fatty alcohol and oleic acid, to 80°C. Combine the two phases with mixing and stirring until they reach room temperature. Then, add the hair dye and remaining ingredients to the composition by dissolving them in the resulting emulsion.

[0202]

[0203] The following oxidizing composition was prepared:

[0204]

[0205]

[0206] Immediately before application to the hair, the above-mentioned oxidative dyeing composition was mixed with the above-mentioned oxidizing composition in a weight ratio of 1:1. 1 g of each ready-to-use composition was then applied to 2 g of yak hair fibers. The same tests and measurements were performed as explained in Examples 1 and 2.

[0207] [Table 3]

[0208] Element Comparison 9 Invention 9 <![CDATA[ΔE*1[pH 5.5]]]> 3.59 2.38 <![CDATA[ΔE*2[pH 4.5]]]> 9.58 3.29 <![CDATA[ΔE*2-ΔE*1]]> 5.99 0.91 Visual appearance Yellow-brown dark brown

[0209] The following embodiments are within the scope of the present invention.

[0210] Example 4

[0211] The stability test of the following composition was carried out at room temperature for 6 weeks. The color of the tested composition was then observed with the naked eye.

[0212]

[0213] Thus, it was found that HC Blue 15 was unstable and its color turned to red, whereas the composition of the present invention showed good storage stability.

[0214] Example 5

[0215] The following dyeing compositions can be produced by conventional formulation techniques.

[0216]

[0217] Example 6

[0218] The following dyeing compositions can be produced by conventional formulation techniques.

[0219]

Claims

1. A dyeing composition for keratin fibers, wherein Include: a) one or more alkalizing agents; b) HC Blue 18 and / or its salts; c) tetrabromophenol blue and / or its salts, the total concentration of the compounds according to a) is in the range of 0.1% to 40% by weight, calculated on the total weight of the composition, the total concentration of the compounds according to b) is in the range of 0.0033% to 0.7% by weight, calculated on the total weight of the composition, The total concentration of the compounds according to c) is in the range of 0.02% to 0.5% by weight, based on the total weight of the composition.

2. The composition according to claim 1, characterized in that The one or more compounds according to a) are one or more organic alkalizing agents and / or ammonia and / or salts thereof.

3. The composition according to claim 1, characterized in that The one or more compounds according to a) are one or more alkanolamines and / or salts thereof and / or ammonia and / or salts thereof.

4. The composition according to claim 1, characterized in that The one or more compounds according to a) are selected from monoethanolamine, diethanolamine, monoethanolmethylamine, monoethanoldimethylamine, diethanolmethylamine, monoethanolethylamine, monoethanoldiethylamine, diethanolethylamine, monoethanolpropylamine, monoethanoldipropylamine, diethanolpropylamine, monoethanolbutylamine, diethanolbutylamine, trimethylamine, triethylamine, 2-amino-2-methylpropanol, tris(hydroxymethyl)-aminomethane, and / or their salts, and / or their mixtures.

5. The composition according to claim 1, characterized in that The one or more compounds according to a) are selected from monoethanolamine, 2-amino-2-methylpropanol, tris(hydroxymethyl)-aminomethane, ammonia, and / or salts thereof, and / or mixtures thereof.

6. The composition according to any one of claims 1 to 5, characterized in that The total concentration of the compounds according to a) is in the range of 0.25% to 30% by weight, based on the total weight of the composition.

7. The composition according to any one of claims 1 to 5, characterized in that The total concentration of the compounds according to a) is in the range of 0.5% to 25% by weight, based on the total weight of the composition.

8. The composition according to any one of claims 1 to 5, characterized in that The total concentration of the one or more alkanolamines and / or salts thereof and / or ammonia and / or salts thereof is in the range of 0.1 wt % to 40 wt %, based on the total weight of the composition.

9. The composition according to any one of claims 1 to 5, characterized in that The total concentration of the one or more alkanolamines and / or salts thereof and / or ammonia and / or salts thereof is in the range of 0.25 wt % to 30 wt %, based on the total weight of the composition.

10. The composition according to any one of claims 1 to 5, characterized in that The total concentration of the one or more alkanolamines and / or salts thereof and / or ammonia and / or salts thereof is in the range of 0.5 wt % to 25 wt %, based on the total weight of the composition.

11. The composition according to any one of claims 1 to 5, characterized in that The total concentration of the compounds according to b) is in the range of 0.005% to 0.7% by weight, based on the total weight of the composition.

12. The composition according to any one of claims 1 to 5, characterized in that The total concentration of the compounds according to b) is in the range of 0.01% to 0.7% by weight, based on the total weight of the composition.

13. The composition according to any one of claims 1 to 5, characterized in that The weight ratio of the compound according to c) to the compound according to b) is in the range of 0.1 to 200.

14. The composition according to any one of claims 1 to 5, characterized in that The weight ratio of the compound according to c) to the compound according to b) is in the range of 0.5 to 160.

15. The composition according to any one of claims 1 to 5, characterized in that The weight ratio of the compound according to c) to the compound according to b) is in the range of 0.8 to 140.

16. The composition according to any one of claims 1 to 5, characterized in that The weight ratio of the compound according to c) to the compound according to b) is in the range of 5 to 100.

17. The composition according to any one of claims 1 to 5, characterized in that The weight ratio of the compound according to c) to the compound according to b) is in the range of 5 to 50.

18. The composition according to any one of claims 1 to 5, characterized in that The composition is an aqueous composition with a pH in the range of 7 to 12.

19. The composition according to any one of claims 1 to 5, characterized in that The composition is an aqueous composition with a pH in the range of 7.5 to 11.

20. The composition according to any one of claims 1 to 5, characterized in that The composition is an aqueous composition with a pH in the range of 8 to 10.

5.

21. The composition according to any one of claims 1 to 5, characterized in that The composition is an aqueous composition with a pH in the range of 9 to 10.

5.

22. The composition according to any one of claims 1 to 5, characterized in that The composition is a composition that is liquid at 25° C. and atmospheric pressure, comprises one or more organic solvents as the compound according to d), and contains less than 1% by weight of water, based on the total weight of the composition.

23. The composition according to any one of claims 1 to 5, characterized in that The composition is a powder composition and optionally comprises one or more powdered excipients as the compound according to e).

24. The composition according to any one of claims 1 to 5, characterized in that The composition comprises one or more lipophilic compounds as compounds according to f).

25. The composition according to any one of claims 1 to 5, characterized in that The composition is an emulsion and comprises one or more compounds according to f) selected from branched or linear saturated or unsaturated fatty alcohols with a carbon chain length ranging from C12 to C22, branched or linear saturated or unsaturated fatty acids with a carbon chain length ranging from C12 to C22, ester oils, vegetable oils, silicone oils, paraffin oils.

26. The composition according to any one of claims 1 to 5, characterized in that The composition comprises one or more surfactants as compounds according to g).

27. The composition according to any one of claims 1 to 5, characterized in that The composition comprises as compound according to g) a surfactant selected from one or more of nonionic surfactants, cationic surfactants, anionic surfactants, zwitterionic surfactants / amphoteric surfactants.

28. The composition according to any one of claims 1 to 5, characterized in that The composition comprises one or more dye compounds different from those of groups b) and c).

29. The composition according to any one of claims 1 to 5, characterized in that The composition comprises dye compounds different from groups b) and c) selected from one or more of oxidation dye precursors, oxidation dye couplers and / or direct dyes.

30. A two-part dyeing composition wherein: A second aqueous composition comprising the composition according to any one of claims 1 to 5 and having a pH in the range of 1 to 6 and optionally comprising one or more oxidizing agents.

31. A kit, wherein: Include: - a first composition comprising a compound according to a) and a compound according to b) as defined in any one of claims 1 to 5; - a second aqueous composition having a pH in the range of 7 to 12 and comprising a compound according to a) and a compound according to c) as defined in any one of claims 1 to 5; and - a third aqueous composition having a pH in the range of 1 to 6 and optionally comprising one or more oxidizing agents.

32. A method for dyeing keratin fibers, wherein: The following steps are involved: i) mixing the composition as defined in any one of claims 1 to 5 with a second aqueous composition as defined in claim 30 to obtain a ready-to-use composition having a pH in the range of 7 to 12; ii) applying the ready-to-use composition to the keratin fibers and leaving it to remain on for a period of time ranging from 1 minute to 60 minutes; and iii) rinsing the keratin fibers and optionally washing the keratin fibers with shampoo.

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