Hair dye composition

Abstract

To provide a hair dye composition capable of reducing hair damage caused by hair dyeing treatment.SOLUTION: The hair dye composition includes a first agent containing an alkali agent and an oxidation dye, and a second agent containing an oxidizing agent. The first agent further contains (A) saccharin and / or a salt thereof. The pH of the first agent is 8 or more and 11 or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to a hair dye composition comprising a first agent containing an alkaline agent and an oxidation dye, and a second agent containing an oxidizing agent. [Background technology]

[0002] A known hair dye composition includes a first agent containing an alkaline agent and an oxidation dye, and a second agent containing an oxidizing agent. In this type of hair dye composition, the alkaline agent swells the hair, facilitating penetration of the oxidation dye and oxidizing agent into the hair through gaps in the cuticle. The oxidizing agent contributes to the decomposition of the melamine pigment contained in the hair and the color development due to the oxidative polymerization of the oxidation dye. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-132192 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when hair is dyed with this type of hair dye composition, damage to the hair may occur, as described in Patent Document 1, for example.

[0005] One aspect of the present disclosure preferably provides a hair dye composition that can reduce hair damage caused by hair dyeing treatment. [Means for solving the problem]

[0006] One aspect of the present disclosure is a hair dye composition comprising a first agent containing an alkaline agent and an oxidation dye, and a second agent containing an oxidizing agent. The first agent further contains (A) saccharin and / or a salt thereof. The pH of the first agent is 8 or more and 11 or less.

[0007] In one embodiment of the present disclosure, the first agent may further contain (B) a cationic polymer.

[0008] In one embodiment of the present disclosure, the first agent may further contain (C) taurine.

[0009] In one embodiment of the present disclosure, the hair dye composition may comprise only the first and second agents. [Effects of the Invention]

[0010] According to one aspect of the present disclosure, a hair dye composition capable of reducing hair damage caused by hair dyeing treatment can be obtained. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described.

[0012] [Hair dye composition] A hair dye composition is a composition that dyes hair by oxidatively polymerizing an oxidative dye to develop color. The hair dye composition is composed of multiple agents, including at least a first agent and a second agent. The first agent contains an alkaline agent and an oxidative dye. The pH of the first agent is 8 or more and 11 or less. The second agent contains an oxidizing agent. The pH of the second agent is, for example, 2 or more and 6 or less. The pH of the first or second agent is the pH of a 1% aqueous solution of the first or second agent at 25°C. The hair dye composition may be, for example, a two-part type containing only the first and second agents, or a three- or more-part type containing other agents in addition to the first and second agents.

[0013] The hair dye composition is applied to the hair after mixing multiple agents. Applying multiple agents to the hair includes applying multiple agents to the hair in a pre-mixed state, and applying multiple agents to the hair sequentially or simultaneously to mix them on the hair.

[0014] The formulation of the hair dye composition and the multiple components constituting the hair dye composition is not particularly limited. For example, the formulation of the hair dye composition and the multiple components constituting the hair dye composition at 25°C can be in the form of a liquid, emulsion, cream, gel, paste, foam (i.e., mousse), etc. The formulation of the hair dye composition refers to the formulation of a mixture of the multiple components constituting the hair dye composition.

[0015] [(A) Saccharin and / or its salt] Of the multiple agents contained in the hair dye composition, at least the first agent contains (A) saccharin and / or a salt thereof (hereinafter referred to as component (A)). Component (A) has the effect of reducing damage to hair caused by hair dyeing. Consequently, component (A) has the effect of improving the feel of hair after hair dyeing, particularly the effect of improving the ease of running fingers through hair after hair dyeing, and the effect of reducing roughness of hair after hair dyeing. Easy-to-run hair can also be said to mean smooth hair. Less roughness of hair can also be said to mean a high uniformity in the texture of the entire hair (i.e., from the roots to the tips).

[0016] As the saccharin salt, inorganic saccharin salts are preferably used, of which metal saccharin salts and ammonium salts are more preferred, sodium saccharin, potassium saccharin, and ammonium saccharin are even more preferred, and sodium saccharin is particularly preferred.

[0017] The content of component (A) in the first agent is preferably 0.01% by mass or more, and more preferably 0.05% by mass or more. The content in a specific agent refers to the mass ratio relative to the total mass of the specific agent. The same applies hereinafter. When the content of component (A) in the first agent is 0.01% by mass or more, hair damage caused by hair dye treatment is further reduced.

[0018] The content of component (A) in the first pack is preferably 10% by mass or less, more preferably 7% by mass or less, and even more preferably 5% by mass or less. When the content of component (A) in the first pack is 10% by mass or less, the solubility of component (A) in the first pack is improved. Furthermore, component (A) is a relatively expensive component among the components contained in hair dye compositions. Therefore, when the content of component (A) in the first pack is 10% by mass or less, the raw material cost of the hair dye composition is reduced. As a result, the economic efficiency of the hair dye composition is improved. For example, it becomes possible to provide the hair dye composition on the market at a price that is affordable for consumers.

[0019] [(B) Cationic polymer] Among the multiple agents contained in the hair dye composition, for example, the first agent may further contain (B) a cationic polymer (hereinafter referred to as component (B)). When the hair dye composition contains component (B), damage to hair caused by the hair dyeing treatment is further reduced. Furthermore, the smoothness of hair after the hair dyeing treatment is further improved. These effects are thought to be due to component (B) being adsorbed to the surface of the hair and coating the hair.

[0020] Examples of the component (B) include cationic polysaccharides, polymers or copolymers of diallyl quaternary ammonium salts, and quaternized polyvinylpyrrolidone.

[0021] Specific examples of cationic polysaccharides include cationic cellulose derivatives, cationic guar gum, and cationic starch.

[0022] Specific examples of cationized cellulose derivatives include O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethyl cellulose chloride (i.e., polyquaternium-10) (e.g., Leoguard GP manufactured by Lion Corporation), O-[2-hydroxy-3-(lauryldimethylammonio)propyl]hydroxyethyl cellulose chloride, and hydroxyethyl cellulose dimethyl diallyl ammonium chloride (i.e., polyquaternium-4).

[0023] Specific examples of cationized guar gum include O-[2-hydroxy-3-(trimethylammonio)propyl]guar gum chloride.

[0024] Specific examples of the polymer or copolymer of a diallyl quaternary ammonium salt include dimethyldiallylammonium chloride polymer (i.e., polydimethyldimethylenepyrrolidinium chloride, or Polyquaternium-6) (e.g., Lubrizol's Mercote 100), dimethyldiallylammonium chloride / acrylic acid copolymer (i.e., Polyquaternium-22) (e.g., Lubrizol's Mercote 280), and acrylic acid / diallyl quaternary ammonium salt / acrylamide copolymer (i.e., Polyquaternium-39).

[0025] Specific examples of quaternized polyvinylpyrrolidone include quaternary ammonium salts of methylvinylimidazolinium chloride / vinylpyrrolidone copolymers (ie, polyquaternium-16).

[0026] As component (B), a polymer or copolymer of a diallyl quaternary ammonium salt and a cationic polysaccharide are preferably used, and among these, a polymer or copolymer of a diallyl quaternary ammonium salt is more preferably used. Among the cationic cellulose derivatives, cationic guar gum, and cationic starch mentioned above as specific examples of cationic polysaccharides, cationic cellulose derivatives and cationic guar gum are more preferred, and cationic cellulose derivatives are even more preferred.

[0027] When the first agent contains component (B), the content of component (B) in the first agent is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more. When the content of component (B) in the first agent is 0.01% by mass or more, damage to hair caused by hair dyeing is further reduced. Furthermore, the ease of running fingers through hair after hair dyeing is further improved.

[0028] When the first agent contains component (B), the content of component (B) in the first agent is preferably 5% by mass or less, more preferably 4% by mass or less, and even more preferably 3% by mass or less. When the content of component (B) in the first agent is 5% by mass or less, the hair is prevented from becoming too stiff due to adsorption of component (B). As a result, the hair becomes even easier to run your fingers through after the hair dyeing process.

[0029] When the first agent contains component (B), the ratio (B) / (A), which is the ratio of the content of component (B) in the first agent to the content of component (A) in the first agent, is preferably 0.05 or more, more preferably 0.1 or more, and even more preferably 1 or more. Furthermore, when the first agent contains component (B), (B) / (A) is preferably 30 or less, more preferably 25 or less, and even more preferably 20 or less. When (B) / (A) is 1 or more and / or 30 or less, damage to hair caused by hair dyeing is further reduced. Furthermore, the ease of running fingers through hair after hair dyeing is further improved.

[0030] [(C) Taurine] Of the multiple agents contained in the hair dye composition, for example, the first agent may further contain (C) taurine (hereinafter referred to as component (C)). When the hair dye composition contains component (C), damage to hair caused by the hair dyeing process is further reduced. Furthermore, roughness of the hair after the hair dyeing process is further reduced. This is thought to be because component (C) tightens the proteins in the hair.

[0031] When the first agent contains component (C), the content of component (C) in the first agent is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more. When the content of component (C) in the first agent is 0.01% by mass or more, damage to hair caused by hair dyeing is further reduced. Furthermore, roughness of hair after hair dyeing is further reduced.

[0032] When the first agent contains component (C), the content of component (C) in the first agent is preferably 3% by mass or less, more preferably 2% by mass or less, and even more preferably 1% by mass or less. When the content of component (C) in the first agent is 3% by mass or less, the solubility of component (C) in the first agent is improved. Furthermore, component (C) is a relatively expensive component among the components contained in hair dye compositions. Therefore, when the content of component (C) in the first agent is 3% by mass or less, the raw material cost of the hair dye composition is reduced. As a result, the economic efficiency of the hair dye composition is improved.

[0033] When the first agent contains component (C), the ratio (C) / (A), which is the ratio of the content of component (C) in the first agent to the content of component (A) in the first agent, is preferably 0.05 or more, more preferably 0.1 or more, and even more preferably 1 or more. Furthermore, when the first agent contains component (C), (C) / (A) is preferably 15 or less, more preferably 12.5 or less, and even more preferably 10 or less. When (C) / (A) is 0.05 or more and / or 15 or less, hair damage due to hair dyeing is further reduced. Furthermore, roughness of the hair after hair dyeing is further reduced.

[0034] [(D) Polyhydric alcohol] Among the multiple agents contained in the hair dye composition, for example, the first agent may further contain (D) a polyhydric alcohol (hereinafter referred to as component (D)). When the hair dye composition contains component (D), damage to hair caused by hair dyeing treatment is further reduced.

[0035] Examples of component (D) include glycols and glycerins. Specific examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol (e.g., PEG400, PEG1000, PEG1500, and PEG1540), polypropylene glycol, isoprene glycol, and 1,3-butylene glycol. Specific examples of glycerins include glycerin, diglycerin, and polyglycerin. Among these, diethylene glycol, polyethylene glycol, glycerin, diglycerin, and polyglycerin are preferred, with polyethylene glycol being more preferred.

[0036] When the first agent contains component (D), the content of component (D) in the first agent is preferably 1% by mass or more, more preferably 2% by mass or more, and even more preferably 3% by mass or more. When the content of component (D) in the first agent is 1% by mass or more, damage to hair caused by hair dye treatment is further reduced.

[0037] When the first agent contains component (D), the content of component (D) in the first agent is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less. When the content of component (D) in the first agent is 20% by mass or less, scalp staining due to hair dye treatment is suppressed.

[0038] [(E) Hydrocarbon] Among the multiple agents contained in the hair dye composition, for example, the first agent may further contain (E) a hydrocarbon (hereinafter referred to as component (E)). When the hair dye composition contains component (E), damage to hair caused by hair dyeing treatment is further reduced.

[0039] Specific examples of component (E) include paraffin, petrolatum, olefin oligomer, polyisobutene, hydrogenated polyisobutene, mineral oil, squalane, polybutene, polyethylene, microcrystalline wax, etc. Among these, paraffin and petrolatum are preferred, and petrolatum is more preferred.

[0040] When the first agent contains component (E), the content of component (E) in the first agent is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.5% by mass or more. When the content of component (E) in the first agent is 0.05% by mass or more, damage to hair caused by hair dye treatment is further reduced.

[0041] When the first agent contains component (E), the content of component (E) in the first agent is preferably 15% by mass or less, more preferably 10.5% by mass or less, and even more preferably 6% by mass or less. When the content of component (E) in the first agent is 15% by mass or less, scalp staining due to hair dye treatment is suppressed.

[0042] [Alkaline agent] Among the multiple components contained in the hair dye composition, at least the first component further contains an alkaline agent. When the hair dye composition is a two-component type, generally, only the first component contains an alkaline agent. The alkaline agent swells the hair, facilitating penetration of other ingredients into the hair through gaps in the cuticle.

[0043] Examples of alkaline agents include ammonia, alkanolamines, organic amines, inorganic alkalis including ammonium salts, basic amino acids, and their salts. Specific examples of alkanolamines include monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, and triisopropanolamine. Specific examples of organic amines include 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, and guanidine. Specific examples of inorganic alkalis including ammonium salts include sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, ammonium carbonate, ammonium bicarbonate, and sodium bicarbonate. Specific examples of basic amino acids include arginine and lysine.

[0044] The content of the alkaline agent in the first agent is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more, and preferably 20% by mass or less, more preferably 18% by mass or less, and even more preferably 16% by mass or less.

[0045] [Oxidation dyes] Among the multiple components of the hair dye composition, at least the first component further contains an oxidation dye. When the hair dye composition is a two-component type, generally, only the first component contains the oxidation dye. The oxidation dye includes, for example, a dye intermediate that develops color by its own oxidative polymerization, and a coupler that develops color by oxidative polymerization with the dye intermediate.

[0046] The dye intermediates are primarily o- or p-phenylenediamine or aminophenol dye precursors, such as p-phenylenediamine, p-toluylenediamine (i.e., toluene-2,5-diamine), N-phenyl-p-phenylenediamine, 4,4'-diaminodiphenylamine, o-aminophenol, p-aminophenol, p-methylaminophenol, 2-hydroxyethyl-p-phenylenediamine, o-chloro-p-phenylenediamine, 4-amino-m-cresol, 2-amino-4-hydroxyethylaminoanisole, 2,4-diaminophenol, 1-hydroxyethyl-4,5-diaminopyrazole, and salts thereof.

[0047] The couplers are mainly m-diamines, aminophenols, or diphenols. Specific examples of the couplers include m-aminophenol, resorcinol, α-naphthol, 5-amino-o-cresol, 5-(2-hydroxyethylamino)-2-methylphenol, m-phenylenediamine, 2,4-diaminophenoxyethanol, toluene-3,4-diamine, 2,6-diaminopyridine, diphenylamine, N,N-dimethyl-m-aminophenol, phenylmethylpyrazolone, 1,5-dihydroxynaphthalene, and salts thereof.

[0048] The content of the oxidative dye in the first agent is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more, and preferably 10% by mass or less, more preferably 9% by mass or less, and even more preferably 8% by mass or less.

[0049] [Oxidizing agent] Among the multiple components of a hair dye composition, at least the second component contains an oxidizing agent. When a hair dye composition is a two-component type, generally, only the second component contains an oxidizing agent. The oxidizing agent has the effect of oxidatively polymerizing the oxidative dye and decomposing melanin in the hair.

[0050] Specific examples of the oxidizing agent include hydrogen peroxide, urea peroxide, melamine peroxide, sodium percarbonate, potassium percarbonate, sodium perborate, potassium perborate, ammonium persulfate, potassium persulfate, and other persulfates, sodium peroxide, potassium peroxide, magnesium peroxide, barium peroxide, calcium peroxide, strontium peroxide, hydrogen peroxide adducts of sulfates, hydrogen peroxide adducts of phosphates, hydrogen peroxide adducts of pyrophosphates, peracetic acid and its salts, performic acid and its salts, permanganates, and bromates. Of these, hydrogen peroxide is preferred.

[0051] The content of the oxidizing agent in the second agent is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1% by mass or more, and preferably 10% by mass or less, more preferably 8% by mass or less, and even more preferably 6% by mass or more.

[0052] [Surfactants] At least one of the multiple components of the hair dye composition may further contain, for example, a surfactant. When the hair dye composition is a two-component system, for example, both the first and second components may further contain a surfactant. The surfactant has the effect of improving the formulation stability.

[0053] Examples of surfactants include nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants. In the following description, POE represents a polyoxyethylene chain, POP represents a polyoxypropylene chain, and the numbers in parentheses following these represent the number of moles added.

[0054] Examples of nonionic surfactants include POE alkyl ethers, POE alkylphenyl ethers, POE-POP alkyl ethers, POE sorbitan fatty acid esters, POE monofatty acid esters, POE glycerin fatty acid esters, polyglycerin fatty acid esters, monoglycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, and alkyl polyglucosides. Specific examples of POE alkyl ethers include POE lauryl ether, POE cetyl ether, POE stearyl ether, POE behenyl ether, POE lanolin, and POE phytosterol.

[0055] Examples of cationic surfactants include alkyl quaternary ammonium salts such as monoalkyl quaternary ammonium salts, dialkyl quaternary ammonium salts, trialkyl quaternary ammonium salts, benzalkonium quaternary ammonium salts, and monoalkyl ether quaternary ammonium salts; amine salts such as alkylamine salts, fatty acid amide amine salts, ester-containing tertiary amine salts, and Arcobalen-type tertiary amine salts; cyclic quaternary ammonium salts such as alkylpyridinium salts and alkylisoquinolium salts; and benzethonium chloride.

[0056] Examples of anionic surfactants include alkyl ether sulfates, POE alkyl ether sulfates, alkyl sulfates, alkenyl ether sulfates, alkenyl sulfates, olefin sulfonates, alkanesulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, α-sulfonic acid salts, N-acylamino acid surfactants, phosphate mono- or diester surfactants, and sulfosuccinate esters. The counter ion of the anionic group of these surfactants may be, for example, any of sodium ion, potassium ion, and triethanolamine.

[0057] Examples of amphoteric surfactants include amino acid type amphoteric surfactants and betaine type amphoteric surfactants.

[0058] Specific examples of amino acid type amphoteric surfactants include sodium N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine (i.e., sodium lauroamphoacetate), 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, sodium undecylhydroxyethylimidazolinium betaine, alkyldiaminoethylglycine hydrochloride, N-cocoyl acyl-N'-carboxyethyl-N'-hydroxyethylethylenediamine sodium, and N-cocoyl acyl-N'-carboxyethoxyethyl Examples thereof include glycine-type amphoteric surfactants such as N-N'-carboxyethylethylenediamine disodium, N-coconut oil fatty acid acyl-N'-carboxymethoxyethyl-N'-carboxymethylethylenediamine disodium, lauryldiaminoethylglycine sodium, and palm oil fatty acid acyl-N-carboxyethyl-N-hydroxyethylethylenediamine sodium; and aminopropionic acid-type amphoteric surfactants such as sodium laurylaminopropionate, sodium laurylaminodipropionate, and triethanolamine laurylaminopropionate.

[0059] Specific examples of betaine-type amphoteric surfactants include coconut oil alkyl betaine, lauryl dimethylaminoacetic acid betaine, myristyl dimethylaminoacetic acid betaine, stearyl dimethylaminoacetic acid betaine, sodium stearyl dimethyl betaine, coconut oil fatty acid amidopropyl betaine, palm oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, ricinoleic acid amidopropyl betaine, and stearyl dihydroxyethyl betaine, as well as amino acetic acid betaine-type amphoteric surfactants such as lauryl hydroxysulfobetaine.

[0060] [Oil-based ingredients other than ingredient (E)] At least one of the agents contained in the hair dye composition may further contain an oily component other than component (E). Examples of oily components other than component (E) include higher alcohols, fats and oils, waxes, higher fatty acids, alkyl glyceryl ethers, ester oils, silicones, and fluorinated oils.

[0061] Specific examples of higher alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol (ie, cetanol), stearyl alcohol, and cetostearyl alcohol.

[0062] The fats and oils are triglycerides, i.e., triesters of fatty acids and glycerin. Specific examples of fats and oils include olive oil, rosehip oil, camellia oil, shea butter, macadamia nut oil, almond oil, tea seed oil, camellia oil, safflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, beef tallow, cacao butter, corn oil, peanut oil, rapeseed oil, rice bran oil, rice germ oil, wheat germ oil, Job's tears oil, grape seed oil, avocado oil, carrot oil, castor oil, linseed oil, coconut oil, mink oil, and egg yolk oil.

[0063] Waxes are esters of higher fatty acids and higher alcohols. Specific examples of waxes include beeswax, candelilla wax, carnauba wax, jojoba oil, lanolin, spermaceti, rice bran wax, sugarcane wax, palm wax, montan wax, cotton wax, bayberry wax, privet wax, kapok wax, and shellac wax.

[0064] Specific examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, hydroxystearic acid, 12-hydroxystearic acid, oleic acid, undecylenic acid, linoleic acid, ricinoleic acid, and lanolin fatty acids.

[0065] Specific examples of alkyl glyceryl ethers include batyl alcohol, chimyl alcohol, selachyl alcohol, and isostearyl glyceryl ether.

[0066] Specific examples of ester oils include diisopropyl adipate, isopropyl myristate, isononyl isononanoate, octyldodecyl myristate, isopropyl palmitate, stearyl stearate, myristyl myristate, isotridecyl myristate, 2-ethylhexyl palmitate, octyldodecyl ricinoleate, cholesteryl / lanosteryl fatty acids having 10 to 30 carbon atoms, cetyl lactate, lanolin acetate, ethylene glycol di-2-ethylhexanoate, pentaerythritol fatty acid esters, dipentaerythritol fatty acid esters, cetyl caprate, glyceryl tricaprylate, diisostearyl malate, dioctyl succinate, cetyl 2-ethylhexanoate (i.e., cetyl ethylhexanoate), and hydrogenated castor oil isostearate.

[0067] Silicone is a synthetic polymer in which silicon and oxygen atoms with organic groups are alternately linked by chemical bonds. Specific examples of silicones include dimethylpolysiloxane (INCI name: dimethicone), dimethylpolysiloxane with hydroxyl terminal groups (INCI name: dimethiconol), methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, polyether-modified silicone, highly polymerized silicone with an average degree of polymerization of 650 to 10,000, amino-modified silicone, betaine-modified silicone, alkyl-modified silicone, alkoxy-modified silicone, mercapto-modified silicone, carboxy-modified silicone, and fluorine-modified silicone.

[0068] [Other ingredients] Each of the multiple agents contained in the hair dye composition may further contain other ingredients as necessary, such as solvents, direct dyes, sugars such as sorbitol and maltose, preservatives such as phenoxyethanol and sodium benzoate, chelating agents such as trisodium hydroxyethylethylenediaminetriacetate and tetrasodium hydroxyethanediphosphonate, pH adjusters, hair growth ingredients, plant extracts, herbal extracts, amino acids, peptides, urea, vitamins, fragrances, and ultraviolet absorbers.

[0069] The hair dye composition described above is a mixture of multiple agents and is used as a hair dye for dyeing hair. The hair dye composition can reduce damage to hair caused by hair dyeing treatment. [Example]

[0070] [Preparation of Hair Dye Composition] A first agent containing each of the components shown in Tables 1 and 2 was prepared according to a conventional method. The pH adjuster in Tables 1 and 2 was added in an appropriate amount so that the pH of the first agent would be the value shown in the "pH of first agent" row. The pH of the first agent was measured at 25°C using a pH meter on a 1% aqueous solution of the first agent. The pH meter used was a pH-METER F-22 manufactured by HORIBA.

[0071] Each of these first agents was mixed with a second agent containing each component shown in Table 3 at a mass ratio of 1:1 to obtain hair dye compositions according to each Example and Comparative Example. In each table, the unit of the numerical values ​​showing the content of each component is % by mass.

[0072] [evaluation] (Less hair damage caused by hair dyeing) The hair dye composition according to each Example and Comparative Example was applied to a hair bundle sample. Beaulax black human hair was used as the hair bundle sample. The hair bundle sample to which the hair dye composition had been applied was left for 30 minutes, and then shampooed. Bigen Treatment Shampoo, manufactured by Hoyu Co., Ltd., was used as the shampoo composition. This series of treatments was repeated five times, and the resulting hair bundle sample was used as the hair bundle sample after the hair dyeing treatment.

[0073] For each example and comparative example, 20 hairs were extracted from the dyed hair bundle sample. Tape stripping was performed 100 times on these 20 hairs using adhesive tape. Nichiban's NicTack Super Strong type adhesive tape was used. After tape stripping, the 20 hairs were separated by cutting the area between the tape-stripped test portion and the unstripped control portion. Each of the separated test and control portions was photographed using a confocal laser scanning microscope. A Keyence VK-X3000 confocal laser scanning microscope was used. The number of cuticles was counted from the obtained images and numerical data according to the method described in Takehito Imai et al., "Morphological Changes of Human Hair Cuticle with Aging," ASCS 2011 Seoul Conference Abstracts, 2011, pp. 32-33. The remaining cuticle count was calculated using the following formula:

[0074]

number

[0075] The greater the number of remaining cuticles, the less the cuticles peeled off by tape stripping, i.e., the less damage to the hair caused by the hair dyeing process. Regarding the degree of hair damage caused by the hair dyeing process, the remaining cuticles were evaluated as "excellent: 5" if 95% or more of the cuticles remained, "good: 4" if 90% or more but less than 95% remained, "fair: 3" if 85% or more but less than 90% remained, "slightly poor: 2" if 80% or more but less than 85% remained, and "poor: 1" if less than 80% remained. The results are shown in the "Less Hair Damage" row in Tables 1 and 2.

[0076] (How smooth the hair is after dyeing) For each example and each comparative example, a hair bundle sample after the hair dyeing treatment was obtained in the same manner as in the evaluation of the degree of damage to the hair due to the hair dyeing treatment. Ten panelists who specialize in evaluating hair texture evaluated the ease of running their fingers through the hair bundle sample after the hair dyeing treatment based on the feel when they ran their fingers through the hair bundle sample after the hair dyeing treatment. Specifically, each panelist scored the hair according to the following four-point scale.

[0077] 4 points: Smooth and no friction. 3 points: Slightly smooth with almost no friction. 2 points: Fingers get caught slightly and there is a slight friction sensation. 1 point: Fingers get caught and feel friction. (Same as Comparative Example 1.)

[0078] The average evaluation scores of the 10 panelists were calculated. Regarding the ease of running fingers through hair after dyeing, an average value of 3.2 or more was rated as "excellent: 5", an average value of 2.4 or more but less than 3.2 was rated as "good: 4", an average value of 1.6 or more but less than 2.4 was rated as "fair: 3", an average value of 0.8 or more but less than 1.6 was rated as "slightly poor: 2", and an average value of less than 0.8 was rated as "poor: 1". The results are shown in the "Ease of running fingers through hair after dyeing" row in Tables 1 and 2.

[0079] (Less roughness of hair after dyeing) For each example and each comparative example, a hair bundle sample after the hair dyeing treatment was obtained in the same manner as in the evaluation of the degree of damage to the hair due to the hair dyeing treatment. Ten panelists who are experts in evaluating hair texture evaluated the degree of roughness of the hair after the hair dyeing treatment based on the feel when touching the hair bundle sample after the hair dyeing treatment. Specifically, each panelist scored the hair according to the following four-point scale.

[0080] 4 points: No roughness or fuzziness. 3 points: Low roughness and almost no pilling. 2 points: Slightly rough and feels a bit fuzzy. 1 point: Rough and fluffy feeling (similar to Comparative Example 1).

[0081] The average evaluation scores of the 10 panelists were calculated. Regarding the reduction in roughness of hair after dyeing, an average value of 3.2 or more was rated as "excellent: 5", an average value of 2.4 or more but less than 3.2 was rated as "good: 4", an average value of 1.6 or more but less than 2.4 was rated as "fair: 3", an average value of 0.8 or more but less than 1.6 was rated as "slightly poor: 2", and an average value of less than 0.8 was rated as "poor: 1". The results are shown in the "Reduction in roughness of hair" row in Tables 1 and 2.

[0082] [Table 1]

[0083] [Table 2]

[0084] [Table 3]

[0085] [Consideration] Comparison of Examples 1 to 20 with Comparative Examples 1 to 4 showed that the hair dye composition can reduce damage to hair caused by hair dyeing by containing component (A) in the first agent and having a pH of 8 to 11. Furthermore, it was also shown that such a hair dye composition can improve the combability of hair after hair dyeing and reduce the roughness of hair after hair dyeing.

[0086] In particular, Examples 3, 6 to 9, and 12 demonstrated that the hair dye composition can further reduce hair damage caused by hair dyeing by further containing component (B) in the first agent.Furthermore, it was also demonstrated that such a hair dye composition can further improve the combability of hair after hair dyeing.

[0087] In particular, Examples 4, 5, and 12 demonstrated that the hair dye composition, in which the first agent further contains component (C), can further reduce hair damage caused by hair dyeing. Furthermore, it was demonstrated that such a hair dye composition can further reduce the roughness of hair after hair dyeing.

[0088] Comparison between Example 1 and Example 13 showed that the hair dye composition in which the first agent further contains component (D) can further reduce hair damage caused by hair dyeing.

[0089] Comparison between Example 1 and Example 17 showed that the hair dye composition in which the first agent further contains component (E) can further reduce hair damage caused by hair dyeing.

Claims

1. A hair dye composition comprising a first agent containing an alkaline agent and an oxidation dye, and a second agent containing an oxidizing agent, The first agent further contains (A) saccharin and / or a salt thereof, The hair dye composition, wherein the pH of the first agent is 8 or more and 11 or less.

2. The hair dye composition according to claim 1, The hair dye composition, wherein the first agent further contains (B) a cationic polymer.

3. The hair dye composition according to claim 1 or 2, The hair dye composition, wherein the first agent further contains (C) taurine.

4. The hair dye composition according to claim 1 or 2, A hair dye composition comprising only the first agent and the second agent.

Images