Oxidizing agent-containing composition

Abstract

To provide an oxidizing agent-containing composition comprising a large amount of an oily component, with which mixing properties by way of shaking can be improved while maintaining emulsification stability.SOLUTION: The oxidizing agent-containing composition of the present invention comprises: (a) 4 mass% or more of an oily component that is in liquid form at 25°C, (b) an anionic surfactant, (c) glycerin fatty acid ester, and (d) an oxidizing agent. The oxidizing agent-containing composition has a viscosity of 100 mPa s or more and 8000 mPa s or less at 25°C, which can be used as a hair bleaching / decoloring agent or hair dye by mixing with other agents by way of shaking.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oxidizing agent-containing composition that is used as a hair bleaching / decoloring agent or hair dye by mixing with other agents by shaking. [Background technology]

[0002] Generally, hair treatment agents that achieve their effects by combining multiple agents are known. Examples of such hair treatment agents include hair bleaching / decoloring agents or hair dyes that are composed of a first agent containing an alkaline agent and a second agent containing an oxidizing agent, such as hydrogen peroxide. The oxidizing agent bleaches melanin in the hair. The alkaline agent enhances the action of the oxidizing agent, thereby improving the brightness of the bleached hair. Furthermore, when a dye is contained in the hair treatment agent, the alkaline agent swells the hair, improving the penetration of the dye into the hair and thereby improving dyeability.

[0003] Conventionally, techniques for improving hair dye performance or brightness by incorporating a high amount of oily ingredients have been known. Patent Document 1 discloses a second agent as an oxidizing agent-containing composition that incorporates 10% by mass of an oily ingredient such as liquid paraffin, a nonionic surfactant having a specified HLB, a higher alcohol, etc. Patent Document 1 discloses that the nonionic surfactant having a specified HLB and the higher alcohol, etc. improve the formulation stability of the second agent and its mixability with the first agent when used with a brush. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-11291 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the oxidizing agent-containing composition of Patent Document 1 has a relatively high viscosity due to the high content of oily components, and has the problem of poor mixability when mixed with a separate first agent by shaking. On the other hand, when the viscosity is reduced, there is also the problem of poor emulsion stability. [Means for solving the problem]

[0006] The present invention is based on the discovery that, in an oxidizing agent-containing composition containing a high content of oily components, by incorporating an anionic surfactant and a glycerin fatty acid ester and specifying the viscosity within a predetermined range, it is possible to improve mixability by shaking while maintaining emulsion stability.

[0007] In order to solve the above problems, one aspect of the present invention provides an oxidizing agent-containing composition that contains the following components (a) to (d) and has a viscosity of 100 mPa·s or more and 8000 mPa·s or less at 25°C, and is used as a hair bleach / decolorizing agent or hair dye by mixing with other agents by shaking:

[0008] (a) 4% by mass or more of liquid oily components at 25°C (b) Anionic surfactants (c) Glycerin fatty acid ester (d) oxidizing agent In the oxidizing agent-containing composition, the (c) glycerin fatty acid ester may be a lipophilic monoglycerin fatty acid ester.

[0009] The oxidizing agent-containing composition may further contain (e) one or more of polyoxyethylene polyoxypropylene alkyl ethers, polyoxyalkylene polyhydric alcohol fatty acid esters, polyhydric alcohol fatty acid esters (except when they fall under the category of component (c)), polyoxyalkylene hydroxy fatty acid ethers, and polyoxyalkylene sterol ethers.

[0010] In the oxidizing agent-containing composition, the anionic surfactant (b) may include an N-acyltaurine salt. In the oxidizing agent-containing composition, the other agent may be an agent containing an alkaline agent, and the mixing ratio of the agent containing an alkaline agent to the oxidizing agent-containing composition during use may be 1:0.5-3 in mass ratio. [Effects of the Invention]

[0011] According to the present invention, in an oxidizing agent-containing composition containing a high content of an oily component, it is possible to improve the mixability by shaking while maintaining emulsion stability. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the oxidizing agent-containing composition of the present invention will be described below. The oxidizing agent-containing composition is configured, for example, as an oxidizing agent-containing composition for a multi-component hair bleaching / dyeing agent or hair dye. Specific examples of multi-component hair bleaching / dyeing agents or hair dyes include two-component hair bleaching / dyeing agents or hair dyes, and three-component hair bleaching / dyeing agents or hair dyes. The oxidizing agent-containing composition is configured as the second component of a two-component hair bleaching / dyeing agent or hair dye, or a three-component hair bleaching / dyeing agent or hair dye.

[0013] Examples of components of hair bleaching / decoloring agents or hair dyeing agents containing a second agent constituted as an oxidizing agent-containing composition are given below. <Two-component hair bleach / decolorizer> A two-component hair bleach / decolorizing agent is composed of, for example, a first component containing at least an alkaline agent, and (d) a second component containing an oxidizing agent or the like.

[0014] (Second agent in a two-agent hair bleach / decolorizer) The second agent contains (d) an oxidizing agent, as well as (a) an oily component that is liquid at 25°C, (b) an anionic surfactant, (c) a glycerin fatty acid ester, etc.

[0015] ((d) Oxidizing agent) (d) The oxidizing agent improves the bleaching properties of melanin contained in hair. Specific examples of the oxidizing agent include hydrogen peroxide, urea peroxide, melamine peroxide, sodium percarbonate, sodium perborate, potassium perborate, ammonium persulfate, potassium persulfate, sodium persulfate, sodium peroxide, potassium peroxide, magnesium peroxide, barium peroxide, calcium peroxide, strontium peroxide, hydrogen peroxide adducts of sulfates, hydrogen peroxide adducts of phosphates, and hydrogen peroxide adducts of pyrophosphates. Of these specific examples of the oxidizing agent, only one may be contained alone, or two or more may be contained in combination.

[0016] The lower limit of the oxidizing agent content in the second agent is set as appropriate, but is preferably 0.1% by mass or more, more preferably 2.0% by mass or more, and even more preferably 3.0% by mass or more. When the oxidizing agent content is 0.1% by mass or more, melanin bleaching properties can be further improved. Furthermore, the upper limit of the oxidizing agent content in the second agent is set as appropriate, but is preferably 15.0% by mass or less, more preferably 9.0% by mass or less, and even more preferably 6.0% by mass or less. When the oxidizing agent content is 15.0% by mass or less, hair damage, etc. can be suppressed. Ranges that combine the above upper and lower limits are also contemplated.

[0017] When hydrogen peroxide is blended as an oxidizing agent in the second agent, in order to improve the stability of the hydrogen peroxide, the second agent preferably contains a stabilizer such as sodium stannate, ethylene glycol phenyl ether (phenoxyethanol), hydroxyethanediphosphonic acid, or a salt thereof, etc. Specific examples of hydroxyethanediphosphonates include tetrasodium hydroxyethanediphosphonate and disodium hydroxyethanediphosphonate.

[0018] ((a) Oily component that is liquid at 25°C) (a) Examples of oily components that are liquid at 25°C include hydrocarbons that are liquid at 25°C, fats and oils such as animal oils and vegetable oils that are liquid at 25°C, waxes that are liquid at 25°C, higher alcohols that are liquid at 25°C, higher fatty acids that are liquid at 25°C, esters that are liquid at 25°C, and silicones that are liquid at 25°C.

[0019] Specific examples of hydrocarbons that are liquid at 25°C include α-olefin oligomers, light isoparaffin, light liquid isoparaffin, synthetic squalane, vegetable squalane, squalane, polybutene, liquid isoparaffin, and liquid paraffin. Specific examples of oils and fats such as animal oils and vegetable oils that are liquid at 25°C include olive oil, camellia oil, sasanqua oil, sunflower oil, soybean oil, corn oil, peanut oil, rapeseed oil, rice bran oil, grape seed oil, macadamia nut oil, castor oil, and palm oil. Specific examples of waxes that are liquid at 25°C include jojoba oil. Specific examples of higher alcohols that are liquid at 25°C include lauryl alcohol, isostearyl alcohol, 2-octyldodecanol, decyltetradecanol, oleyl alcohol, and 2-hexyldecanol.

[0020] Specific examples of higher fatty acids that are liquid at 25°C include isostearic acid and oleic acid. Specific examples of esters that are liquid at 25°C include diisopropyl adipate, isostearyl myristate, isotridecyl myristate, isopropyl myristate, octyldodecyl myristate, cetyl octanoate, isononyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, diisopropyl sebacate, isopropyl palmitate, hexyl laurate, decyl oleate, hexyldecyl dimethyloctanoate, octyl palmitate, lauryl lactate, octyldodecyl lactate, isocetyl stearate, isocetyl isostearate, ethylene glycol dioctanoate, cetyl caprylate, glyceryl tricaprylate, neopentyl glycol dicaprate, cetyl 2-ethylhexanoate, triglycerides that are liquid at 25°C, and amino acid esters that are liquid at 25°C. Specific examples of triglycerides include glyceryl trioleate, glyceryl tristearate, and glyceryl tripalmitate. Specific examples of amino acid esters include di(cholesteryl octyldodecyl) N-lauroyl-L-glutamate. Specific examples of silicones that are liquid at 25°C include methylpolysiloxanes with molecular weights of less than 150,000, highly polymerized methylpolysiloxanes, methylphenylpolysiloxanes, and methylcyclopolysiloxanes.

[0021] Among these specific examples of oily components, only one may be contained alone, or two or more may be contained in combination. (a) As the oily component that is liquid at 25°C, from the viewpoint of excellent bleaching ability, or in the case of a hair dye described below, from the viewpoint of excellent hair dyeing performance, hydrocarbons, esters, silicones, and fats and oils are preferred, and hydrocarbons are particularly preferred. Among hydrocarbons, liquid paraffin, liquid isoparaffin, squalane, and α-olefin oligomers are preferred, and liquid paraffin is particularly preferred.

[0022] The lower limit of the content of component (a) in the second agent is 4% by mass or more, preferably 6% by mass or more, and more preferably 8% by mass or more. A content of 4% by mass or more improves bleaching properties. In the case of a hair dye described below, it also improves hair dyeing performance. The upper limit of the content of component (a) in the second agent can be set appropriately, but is preferably 20% by mass or less, more preferably 18% by mass or less, and even more preferably 15% by mass or less. A content of 20% by mass or less further improves emulsion stability. It also improves mixability with the first agent. Any combination of the above upper and lower limits is also contemplated.

[0023] ((b) Anionic surfactants) (b) Anionic surfactants particularly improve emulsion stability. Specific examples of (b) anionic surfactants include alkyl ether sulfates, alkyl sulfates, alkyl ether sulfate ester salts, alkenyl ether sulfates, alkenyl sulfates, olefin sulfonates, alkanesulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylate salts, α-sulfonic acid salts, N-acylamino acid surfactants, phosphate mono- or diester surfactants, sulfosuccinate esters, N-acyltaurate salts, and derivatives thereof. Specific examples of counter ions of the anionic groups of these surfactants include sodium ions, potassium ions, triethanolamine, and the like. More specifically, examples of alkyl ether sulfate ester salts include polyoxyethylene (hereinafter also referred to as "POE") lauryl ether sodium sulfate. Specific examples of alkyl sulfate salts include sodium lauryl sulfate and sodium cetyl sulfate. Specific examples of alkyl sulfate derivatives include POE sodium lauryl sulfate. Specific examples of phosphate mono- or diester surfactants include POE oleyl ether phosphate. Specific examples of sulfosuccinate esters include disodium lauryl sulfosuccinate. Specific examples of N-acyltaurate salts include N-alkyloylmethyltaurine salts such as sodium N-stearoyl-N-methyltaurine. Of these specific examples of (b) anionic surfactants, only one may be contained alone, or two or more may be contained in combination. Among these, from the viewpoint of providing superior emulsification stability to the second agent, N-acyltaurate salts and alkyl sulfate salts are preferred, with N-acyltaurate salts being particularly preferred.

[0024] The lower limit of the content of component (b) in the second agent is set appropriately, but 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) is 0.01% by mass or more, emulsion stability is further improved. Furthermore, the upper limit of the content of component (b) in the second agent is set appropriately, but is preferably 5% 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 (b) is 5% by mass or less, emulsion stability is further improved. Ranges that combine the above upper and lower limits are also envisioned.

[0025] The upper limit of the mass ratio (b / a) of the content of component (b) to the content of component (a) in the second agent can be set as appropriate, but is preferably 0.5 or less, more preferably 0.3 or less, even more preferably 0.1 or less, and particularly preferably 0.05 or less. A mass ratio of 0.5 or less suppresses the feeling of greasyness. The feeling of greasyness is a sensation that arises when component (a), which is blended in high amounts as in the present invention, coexists with component (b), and refers to a sensation that combines the oily feeling of component (a), i.e., a moist and sticky feeling, with the feeling of greasyness of component (b). Hereinafter, the same meaning will be used for the term "greasy feeling."

[0026] ((c) Glycerin fatty acid ester) (c) Glycerin fatty acid esters particularly improve emulsion stability. They may be monoglycerin fatty acid esters or polyglycerin fatty acid esters, each of which has one glycerin structural unit. Among these, monoglycerin fatty acid esters are preferred from the viewpoint of further improving emulsion stability. (c) Glycerin fatty acid esters are preferably lipophilic glycerin fatty acid esters with an HLB value of 6.0 or less. The lower the HLB value, i.e., the more lipophilic they are, the more emulsion stability is improved.

[0027] Specific examples of (c) glycerin fatty acid esters are listed below. In the present invention, the HLB value is determined by the actual measurement described below, but the values ​​listed in the Nikko Chemicals catalog (2017) are also listed as reference values. Specific examples of (c) glycerin fatty acid esters include lipophilic glyceryl monooleate (HLB: 2.5), lipophilic glyceryl monostearate (HLB: 4.0), self-emulsifying glyceryl monostearate (HLB: 6.0), glyceryl myristate (HLB: 3.5), and polyglyceryl monostearate (HLB: 5.0). Of the specific examples of (c) glycerin fatty acid esters, only one may be contained alone, or two or more may be contained in combination. Among these, lipophilic monoglycerin fatty acid esters are preferred, and lipophilic glyceryl monostearate is more preferred, from the viewpoint of excellent emulsion stability of the second agent.

[0028] The HLB (hydrophile-lipophile balance) is a numerical value established by W.C. Griffin and assigned to nonionic surfactants. It represents the balance between the strength of the lipophilic group (alkyl group) and the hydrophilic group (ethylene oxide chain). The HLB value is calculated from the emulsification method (see "Handbook - Cosmetics and Pharmaceutical Ingredients" by Nikko Chemicals Co., Ltd. (revised February 1, 1977)). To measure the HLB value, a combination of sorbitan monostearate (e.g., Nikko Chemicals' NIKKOL SS-10, HLB value 4.7) and polyoxyethylene sorbitan monostearate (e.g., Nikko Chemicals' NIKKOL TS-10, HLB value 14.9) is used as surfactant standards. Liquid paraffin is used as the emulsifier. If variations in the liquid paraffin type or lot size are anticipated, measurements should be performed each time. Liquid paraffin is emulsified with the above two types of surfactants to determine the optimal surfactant ratio and the required HLB value of the liquid paraffin (the HLB value at which it is emulsified). The calculation formula is shown in Equation (1).

[0029]

number

[0030] The lower limit of the content of component (c) in the second agent can be set as appropriate, but 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) is 0.01% by mass or more, emulsion stability is further improved. Furthermore, the upper limit of the content of component (c) in the second agent can be set as appropriate, but is preferably 5% 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) is 5% by mass or less, emulsion stability is further improved. Any combination of the above upper and lower limits is also contemplated.

[0031] ((e) component) The second agent may further contain one or more of (e) polyoxyethylene polyoxypropylene alkyl ethers, polyoxyalkylene polyhydric alcohol fatty acid esters, polyhydric alcohol fatty acid esters (except when falling under the category of component (c) above), polyoxyalkylene hydroxy fatty acid ethers, and polyoxyalkylene sterol ethers. Component (e) further improves the miscibility of the second agent with the first agent. Component (e) is a nonionic surfactant with a relatively large volume occupied by hydrophilic groups. When such nonionic surfactants are arranged at the interface between the oil droplets and the continuous layer, a thick layer of hydrophilic groups is thought to form around the oil droplets. The presence of this thick hydrophilic base layer is thought to weaken the interactions between the oil droplets and increase the fluidity of the continuous layer. This is thought to result in improved miscibility. Fluidity here is a different concept from viscosity and refers to the ease of movement of the continuous layer within the emulsion structure. Therefore, the incorporation of component (e) can improve miscibility without reducing viscosity.

[0032] The lower limits of the number of moles of ethylene oxide and propylene oxide added that constitute the polyoxyethylene polyoxypropylene alkyl ether are set as appropriate, but are each preferably 0.1 mole or more, more preferably 1 mole or more, and even more preferably 2 moles or more. The upper limits of the number of moles added are set as appropriate, but are each preferably 60 moles or less, more preferably 50 moles or less, and even more preferably 40 moles or less. These numerical ranges further improve emulsion stability and mixability. Ranges that combine the above upper and lower limits are also envisioned. The number of moles of ethylene oxide and propylene oxide added refers to the number of moles of ethylene oxide and propylene oxide per mole of alcohol in the charged raw material. The addition form of ethylene oxide and propylene oxide may be block addition, random addition, or a combination of block addition and random addition, and is not particularly limited.

[0033] Specific examples of alcohols used as raw materials for polyoxyethylene polyoxypropylene alkyl ether include (1) methanol, ethanol, propanol, butanol, pentanol, hexanol, octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, eicosanol, heneicosanol, docosanol, tricosanol, tetracosanol, pentacosanol, hexacosanol, heptacosanol, octacosanol, nonacosanol, triacontanol, etc. (2) branched alkyl alcohols such as isopropanol, isobutanol, isohexanol, 2-ethylhexanol, isononanol, isodecanol, isododecanol, isotridecanol, isotetradecanol, isopentadecanol, isohexadecanol, isoheptadecanol, isooctadecanol, isononadecanol, isoeicosanol, isoheneicosanol, isodocosanol, isotricosanol, isotetracosanol, isopentacosanol, isohexacosanol, isoheptacosanol, isooctacosanol, isononacosanol, and isotriacontanol. The alkyl group forming the polyoxyethylene polyoxypropylene alkyl ether is preferably an alkyl group having 8 to 24 carbon atoms, more preferably an alkyl group having 12 to 18 carbon atoms.

[0034] Specific examples of polyoxyethylene polyoxypropylene alkyl ethers include polyoxyethylene polyoxypropylene cetyl ether (20 E.O. (indicating the number of moles of ethylene oxide added (same hereinafter)), 4 P.O. (indicating the number of moles of propylene oxide added (same hereinafter))) HLB 16.5, polyoxyethylene polyoxypropylene cetyl ether (1 E.O., 4 P.O.) HLB 9.5, polyoxyethylene polyoxypropylene cetyl ether (10 E.O., 4 P.O.) HLB 10.5, polyoxyethylene polyoxypropylene cetyl ether (20 E.O., 8 P.O.) HLB 12.5, and polyoxyethylene polyoxypropylene decyl tetradecyl ether (30 E.O., 6 P.O.) HLB 12.0.

[0035] The HLB value of the polyoxyethylene polyoxypropylene alkyl ether is set appropriately, but is preferably at least 8, and more preferably at least 13. When the HLB value is at least 8, the miscibility of the second part with the first part is further improved.

[0036] The HLB (hydrophile-lipophile balance) is a value given to nonionic surfactants by W.C. Griffin, and it represents the balance between the strength of the lipophilic group (alkyl group) and the hydrophilic group (ethylene oxide chain). The HLB value is the actual value calculated from the emulsification method described in the ingredient section (b) above (see "Handbook - Cosmetics and Pharmaceutical Ingredients" published by Nikko Chemicals Co., Ltd. (revised edition published February 1, 1977)).

[0037] Specific examples of polyhydric alcohols constituting the polyoxyalkylene polyhydric alcohol fatty acid ester or polyhydric alcohol fatty acid ester include ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, 1,3-butylene glycol, glycerin, polyglycerin, sorbitan, pentaerythritol, sorbitol, and trimethylolpropane.

[0038] The fatty acid constituting the polyoxyalkylene polyhydric alcohol fatty acid ester or polyhydric alcohol fatty acid ester is preferably a fatty acid having 8 to 24 carbon atoms. Known fatty acids having 8 to 24 carbon atoms can be appropriately used, and may be saturated or unsaturated. Specific examples of saturated fatty acids include octanoic acid (caprylic acid), nonanoic acid, decanoic acid (capric acid), dodecanoic acid (lauric acid), tetradecanoic acid (myristic acid), hexadecanoic acid (palmitic acid), octadecanoic acid (stearic acid), eicosanoic acid (arachidic acid), docosanoic acid (behenic acid), and tetracosanoic acid. Specific examples of unsaturated fatty acids include myristoleic acid, palmitoleic acid, oleic acid, vaccenic acid, eicosenoic acid, linoleic acid, α-linolenic acid, γ-linolenic acid, and arachidonic acid.

[0039] Specific examples of alkylene oxides constituting the alkylene oxide chain of the polyoxyalkylene polyhydric alcohol fatty acid ester include ethylene oxide and propylene oxide. The lower limit of the number of moles of alkylene oxide added can be set appropriately, but is preferably 0.1 moles or more, more preferably 1 mole or more, and even more preferably 2 moles or more. The upper limit of the number of moles added can be set appropriately, but is preferably 200 moles or less, more preferably 150 moles or less, and even more preferably 100 moles or less. This numerical range further improves emulsion stability and mixability. Any combination of the above upper and lower limits is also possible. The number of moles of alkylene oxide added refers to the number of moles of alkylene oxide per mole of polyhydric alcohol in the raw material. When two or more types of alkylene oxide are used, the addition form may be block addition, random addition, or a combination of block addition and random addition, and is not particularly limited.

[0040] Specific examples of polyoxyalkylene polyhydric alcohol fatty acid esters or polyhydric alcohol fatty acid esters include POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan monopalmitate, POE sorbitan monolaurate, POE sorbitan trioleate, POE glyceryl monostearate, POE glyceryl monomyristate, POE sorbitol tetraoleate, POE sorbitol hexastearate, POE sorbitol monolaurate, POE sorbitol beeswax, polyethylene glycol monooleate, polyethylene glycol monostearate, polyethylene glycol monolaurate, sorbitan monolaurate, and POE reduced lanolin.

[0041] Specific examples of hydroxy fatty acids constituting polyoxyalkylene hydroxy fatty acid ethers include 12-hydroxydodecanoic acid, 12-hydroxystearic acid, 9,10-dihydroxystearic acid, and ricinoleic acid. Fatty acids containing hydroxy fatty acids, such as castor oil fatty acid and hydrogenated castor oil fatty acid, may also be used. Specific examples of polyoxyalkylene hydroxy fatty acid ethers include polyoxyethylene hydrogenated castor oil and polyoxyethylene castor oil.

[0042] As the alkylene oxide chain constituting the polyoxyalkylene hydroxy fatty acid ether, the specific examples and added mole numbers of alkylene oxides described in the section on polyoxyalkylene polyhydric alcohol fatty acid esters can be used.

[0043] Specific examples of sterols constituting polyoxyalkylene sterol ethers include phytosterol and cholesterol. The alkylene oxide chains constituting polyoxyalkylene sterol ethers can be the specific examples and added mole numbers of alkylene oxides described in the section on polyoxyalkylene polyhydric alcohol fatty acid esters. Specific examples of polyoxyalkylene sterol ethers include polyoxyethylene phytosterol (PEG-30 phytosterol).

[0044] Of these specific examples of component (e), only one may be contained alone, or two or more may be contained in combination. Among these, polyoxyethylene polyoxypropylene alkyl ether is preferred from the viewpoint of excellent emulsion stability of the second agent.

[0045] The lower limit of the content of component (e) in the second agent can be set as appropriate, but is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.3% by mass or more. When the content of component (e) is 0.01% by mass or more, emulsion stability and mixability are further improved. Furthermore, the upper limit of the content of component (e) in the second agent can be set as appropriate, but is preferably 5% 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 (e) is 5% by mass or less, emulsion stability is further improved. Ranges that combine the above upper and lower limits are also contemplated.

[0046] (others) The hair bleaching / decolorizing agent may further contain ingredients other than those mentioned above, as necessary, such as solubilizers, water-soluble polymers, inorganic polymers, oily ingredients other than those mentioned above, polyhydric alcohols, surfactants other than those mentioned above, pH adjusters, sugars, preservatives, stabilizers, plant extracts, herbal extracts, vitamins, fragrances, antioxidants, chelating agents, ultraviolet absorbers, etc.

[0047] The solubilizer is blended, for example, to make the second agent liquid. Examples of solubilizers used include water and organic solvents (solvents). Specific examples of organic solvents include ethanol, n-propanol, isopropanol, methyl cellosolve, ethyl cellosolve, methyl carbitol, ethyl carbitol, benzyl alcohol, phenethyl alcohol, γ-phenylpropyl alcohol, cinnamic alcohol, anise alcohol, p-methylbenzyl alcohol, α-dimethylphenethyl alcohol, α-phenylethanol, ethylene glycol phenyl ether (phenoxyethanol), phenoxyisopropanol, 2-benzyloxyethanol, N-alkylpyrrolidone, alkylene carbonate, and alkyl ether. Of these specific examples of solubilizers, only one may be used alone, or two or more may be used in combination. Among these, water is preferably used because of its excellent ability to dissolve other components in the second agent. When water is used as the solvent, the content of water in the second part (content at the time of use) is preferably 40% by mass or more, and more preferably 50% by mass or more.

[0048] The water-soluble polymer imparts an appropriate viscosity to the hair bleaching / dyeing agent. Therefore, the hair bleaching / dyeing agent may contain a water-soluble polymer within a range that does not impair the effects of the present invention. Examples of water-soluble polymers include natural polymers, semi-synthetic polymers, and synthetic polymers. Specific examples of natural polymers include starch, guar gum, locust bean gum, quince seed, carrageenan, galactan, gum arabic, tragacanth gum, pectin, mannan, xanthan gum, dextran, succinoglucan, curdlan, hyaluronic acid, gelatin, casein, albumin, collagen, dextrin, and triglucopolysaccharide (pullulan).

[0049] Specific examples of semi-synthetic polymers include crystalline cellulose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxyethyl cellulose dimethyl diallyl ammonium chloride, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, hydroxypropyl methyl cellulose, cationized cellulose, cationized guar gum, starch phosphate ester, propylene glycol alginate, and alginates.

[0050] Specific examples of synthetic polymers include polyvinyl caprolactam, polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), vinylpyrrolidone-vinyl acetate (VP / VA) copolymer, polyvinyl butyral, polyvinyl methyl ether, carboxyvinyl polymer, poly(sodium acrylate), polyacrylamide, polyethylene oxide, ethylene oxide-propylene oxide block copolymer, acrylic acid / alkyl acrylate copolymer, polydimethylmethylene piperidinium chloride (polydimethyldimethylene pyrrolidinium chloride) (Polyquaternium-6) (Merck & Co., Inc.), a copolymer consisting of a half ester of itaconic acid and a poly(ethylene glycol) alkyl ether, or an ester of methacrylic acid and a poly(ethylene glycol) alkyl ether, and at least one monomer selected from acrylic acid, methacrylic acid, and their alkyl esters. Of these specific examples of water-soluble polymers, only one may be used alone, or two or more may be used in combination.

[0051] Specific examples of inorganic polymers include bentonite, aluminum magnesium silicate, laponite, hectorite, silicic anhydride, etc. Of these specific examples of inorganic polymers, only one may be contained alone, or two or more may be contained in combination.

[0052] An oily component that is solid at 25°C may be blended within a range that does not impair the effects of the present invention in order to impart a moist feeling to hair, emulsify the hair bleaching / dyeing agent, adjust viscosity, or improve viscosity stability. Examples of oily components that are solid at 25°C include hydrocarbons that are solid at 25°C, animal and vegetable oils and fats that are solid at 25°C, waxes that are solid at 25°C, higher alcohols that are solid at 25°C, alkyl glyceryl ethers, higher fatty acids that are solid at 25°C, esters that are solid at 25°C, and silicones that are solid at 25°C.

[0053] Specific examples of hydrocarbons that are solid at 25° C. include paraffin, polyethylene powder, microcrystalline wax, and petrolatum, which are solid at 25° C. Specific examples of animal and vegetable oils that are solid at 25° C. include cocoa butter, shea butter, palm butter, hydrogenated palm kernel oil, and hydrogenated castor oil.

[0054] Specific examples of waxes that are solid at 25° C. include beeswax, candelilla wax, carnauba wax, lanolin, rice bran wax, etc. Specific examples of higher alcohols that are solid at 25° C. include myristyl alcohol, cetanol, stearyl alcohol, arachyl alcohol, behenyl alcohol, lanolin alcohol, etc. Specific examples of alkyl glyceryl ethers include batyl alcohol, chimyl alcohol, selachyl alcohol, isostearyl glyceryl ether, etc.

[0055] Specific examples of higher fatty acids that are solid at 25°C include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, hydroxystearic acid, undecylenic acid, and ricinoleic acid. Specific examples of esters that are solid at 25°C include butyl stearate, stearyl stearate, cetyl myristate, myristyl myristate, cetyl palmitate, cetyl lactate, myristyl lactate, lanolin acetate, cholesteryl stearate, cholesteryl oleate, oleyl oleate, dioctyl succinate, and diethoxyethyl succinate. Specific examples of silicones that are solid at 25°C include highly polymerized methylpolysiloxanes with a molecular weight of 150,000 or more. Of these specific examples of oily components, only one may be contained alone, or two or more may be contained in combination.

[0056] Examples of polyhydric alcohols include glycol and glycerin. Specific examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, highly polymerized polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, isoprene glycol, and 1,3-butylene glycol. Specific examples of glycerin include glycerin, diglycerin, and polyglycerin. Of these specific examples of polyhydric alcohols, only one may be contained alone, or two or more may be contained in combination.

[0057] Surfactants act as emulsifiers or components for solubilizing various components of the hair bleaching / decoloring agent, emulsifying or solubilizing the agent during use, adjusting viscosity, and improving viscosity stability. Therefore, the hair bleaching / decoloring agent may further contain the surfactants listed below within a range that does not impair the effects of the present invention. Examples of surfactants include cationic surfactants, amphoteric surfactants, and nonionic surfactants.

[0058] Specific examples of cationic surfactants include lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, alkyltrimethylammonium chloride, distearyldimethylammonium chloride, cetyltrimethylammonium bromide, stearyltrimethylammonium bromide, lanolin fatty acid aminopropylethyldimethylammonium ethyl sulfate, stearyltrimethylammonium saccharin, cetyltrimethylammonium saccharin, methacryloyloxyethyltrimethylammonium chloride, behenyltrimethylammonium methylsulfate, behenyldimethylamine, behenic acid diethylaminoethylamide, behenic acid dimethylaminopropylamide, behenic acid dimethylaminoethylamide, stearyldimethylamine, palmitoxypropyldimethylamine, stearoxypropyldimethylamine, and stearic acid dimethylaminopropylamide.

[0059] Specific examples of amphoteric surfactants include cocobetaine, lauramidopropyl betaine, cocamidopropyl betaine, sodium lauroamphoacetate, sodium cocoamphoacetate, coconut oil fatty acid amidopropyl betaine, lauryl betaine (lauryl dimethylaminoacetic acid betaine), and sodium lauryl aminopropionate.

[0060] Specific examples of nonionic surfactants include ether-type nonionic surfactants other than component (e), ester-type nonionic surfactants other than components (c) and (e), alkyl glucoside, etc. Specific examples of ether-type nonionic surfactants include POE cetyl ether (ceteth), POE stearyl ether (steareth), POE behenyl ether, POE oleyl ether (oleth), POE lauryl ether (laureth), POE octyldodecyl ether, POE hexyldecyl ether, POE isostearyl ether, POE nonylphenyl ether, POE octylphenyl ether, etc.

[0061] Specific examples of alkyl glucosides include alkyl (having 8 to 16 carbon atoms) glucoside, POE methyl glucoside, POE dioleate methyl glucoside, etc. Of these specific examples of surfactants, only one may be contained alone, or two or more may be contained in combination.

[0062] A pH adjuster may be added to adjust the pH of the hair bleaching / decoloring agent. Examples of pH adjusters include inorganic acids, organic acids, and their salts. Specific examples of inorganic acids include phosphoric acid, hydrochloric acid, nitric acid, sulfuric acid, and boric acid. Specific examples of phosphoric acid include orthophosphoric acid, polyphosphoric acid, pyrophosphoric acid, and metaphosphoric acid. Specific examples of organic acids include citric acid, tartaric acid, lactic acid, malic acid, succinic acid, fumaric acid, maleic acid, gluconic acid, glucuronic acid, and benzoic acid. Specific examples of salts include sodium salts, potassium salts, and ammonium salts. Specific examples of sugars include monosaccharides such as glucose and galactose, disaccharides such as maltose, sucrose, fructose, and trehalose, and sugar alcohols. Specific examples of preservatives include parabens, methylparaben, and sodium benzoate. Specific examples of stabilizers include phenacetin, 8-hydroxyquinoline, acetanilide, sodium pyrophosphate, barbituric acid, uric acid, and tannic acid. Specific examples of antioxidants include ascorbic acids and sulfites. Specific examples of chelating agents include edetic acid (ethylenediaminetetraacetic acid (EDTA)), disodium edetate, tetrasodium edetate, diethylenetriaminepentaacetic acid and its salts, ethylenediaminehydroxyethyltriacetic acid and its salts, and hydroxyethanediphosphonic acid (HEDP) and its salts.

[0063] The dosage form of the second agent when used is not particularly limited, and specific examples include liquid forms such as aqueous solutions and emulsions, gels, foams, creams, etc. at 25°C. In the case of non-aerosols, various forms such as squeeze foamers and pump foamers can also be used. Of these, liquid forms are preferred from the viewpoint of improving mixability by shaking.

[0064] The lower limit of the viscosity of the second part at 25°C during storage is 100 mPa·s or more, preferably 300 mPa·s or more, and more preferably 500 mPa·s or more. A viscosity of 100 mPa·s or more can improve emulsion stability. In particular, mixability can be improved when predetermined amounts of each part are placed in a sealed container of a predetermined capacity and mixed by shaking. The upper limit of the viscosity of the second part at 25°C is 8000 mPa·s or less, preferably 7000 mPa·s or less, and more preferably 6000 mPa·s or less. A viscosity of 8000 mPa·s or less can improve mixability with the first part. Any combination of the above upper and lower limits is also contemplated.

[0065] The viscosity can be determined using, for example, a Brookfield viscometer at 25°C for 1 minute. A specific example of a Brookfield viscometer is the BL-type viscometer VISCOMETER (manufactured by Toki Sangyo Co., Ltd.). The rotor and rotation speed used are appropriately selected according to the measurable viscosity range of the measuring instrument. For example, a No. 1 rotor is used for a viscosity of 100 to 250 mPa·s, a No. 2 rotor for a viscosity of 250 to 2500 mPa·s, and a No. 3 rotor for a viscosity of 2500 mPa·s or higher, all at a rotation speed of 12 rpm. The viscosity of the second part can be adjusted appropriately by changing the blending ratio of the solubilizer, water-soluble polymer, oily component, surfactant, etc.

[0066] (First agent in a two-agent hair bleach / decolorizer) The first agent contains an alkaline agent. The alkaline agent contained in the first agent accelerates the action of the oxidizing agent contained in the second agent, improving the hair bleaching and / or decoloring effects. In the hair dye described below, it also improves hair dyeing properties. Examples of alkaline agents include ammonia, alkanolamines, silicates, carbonates, bicarbonates, carbamates, metasilicates, phosphates, organic amines, and basic amino acids. Specific examples of alkanolamines include monoethanolamine and triethanolamine. Specific examples of silicates include sodium silicate, potassium silicate, and calcium silicate. Specific examples of carbonates include sodium carbonate, ammonium carbonate, and magnesium carbonate. Specific examples of bicarbonates include sodium bicarbonate and ammonium bicarbonate. Specific examples of carbamates include ammonium carbamate. Specific examples of metasilicates include sodium metasilicate and potassium metasilicate. Specific examples of phosphates include triammonium phosphate and diammonium hydrogen phosphate. Specific examples of organic amines include 2-amino-2-methyl-1-propanol (AMP), 2-amino-2-methyl-1,3-propanediol, and guanidine. Specific examples of basic amino acids include arginine and lysine. Of these specific examples of alkaline agents, only one may be contained alone, or two or more may be contained in combination. Among these, ammonia, ammonium salts, alkanolamines, and carbonates are preferably used in view of their excellent effect of improving hair brightness.

[0067] When used, the alkaline agent content in the hair bleaching / decoloring agent, i.e., the mixture of the first and second agents, is preferably blended in an amount that results in a pH in the range of 7 to 12, and more preferably in the range of 9 to 12, when the hair bleaching / decoloring agent is used for normal bleaching / decoloring treatments. By maintaining the pH of the mixture at 7 or higher, the action of the oxidizing agent contained in the second agent can be promoted. By maintaining the pH of the mixture at 12 or lower, damage to hair caused by application of the hair bleaching / decoloring agent can be suppressed. The pH of the mixture is measured at 25°C when the mixture of each agent is diluted 10 times with water and dissolved at a concentration of 10% by mass.

[0068] The first agent may contain components that are generally contained in hair bleaching / decoloring agents and that do not inhibit the action of the aforementioned components. For example, the first agent may contain the components contained in the second agent described above as appropriate, within the range that does not inhibit the effects of the present invention.

[0069] The dosage form of the first agent during use or storage is not particularly limited, and specific examples of dosage forms at 25°C include liquid forms such as aqueous solutions and emulsions, gels, foams, creams, and solid forms. Examples of solid forms include powders, granules, and tablets. In the case of solid dosage forms, dispersants such as metal stearates such as calcium stearate and magnesium stearate, sodium sulfate, talc, lactose, and low-substituted hydroxypropyl cellulose may be blended. Of these specific examples of dispersants, only one may be contained alone, or two or more may be contained in combination. Among these, from the viewpoint of improving mixability with the second agent, the dosage form during use is preferably liquid, gel, foam, or cream, with liquid and cream being particularly preferred.

[0070] <Two-component hair dye> A two-component hair dye is composed of, for example, a first component containing at least an alkaline agent and an oxidation dye, and a second component containing an oxidizing agent, etc. The following will focus on the differences from the above-mentioned hair bleaching and decoloring agents.

[0071] (Second agent in a two-agent hair dye) The second agent of the hair dye has, for example, the same composition as the second agent of the hair bleaching / decoloring agent described above. (First agent in a two-agent hair dye) The first agent of the hair dye contains, for example, an alkaline agent and an oxidation dye. Examples of alkaline agents contained in the first agent are the same as those described above as specific examples of alkaline agents used in the hair bleaching and decoloring agents. Oxidation dyes are compounds that can develop color through oxidative polymerization with an oxidizing agent, and are classified into dye intermediates and couplers. Oxidation dyes preferably contain a dye intermediate and a coupler.

[0072] Examples of dye intermediates include p-phenylenediamine, toluene-2,5-diamine (para-toluylenediamine), N-phenyl-p-phenylenediamine, 4,4'-diaminodiphenylamine, p-aminophenol, o-aminophenol, p-methylaminophenol, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, 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. Specific examples of salts include hydrochlorides and sulfates. Of these specific dye intermediates, only one may be used alone, or two or more may be used in combination.

[0073] The coupler develops color upon bonding with a dye intermediate. Examples of couplers include resorcinol, 5-amino-o-cresol, m-aminophenol, α-naphthol, 5-(2-hydroxyethylamino)-2-methylphenol, m-phenylenediamine, 2,4-diaminophenoxyethanol, toluene-3,4-diamine, 2,6-diaminopyridine, diphenylamine, N,N-diethyl-m-aminophenol, phenylmethylpyrazolone, 1,5-dihydroxynaphthalene, and salts thereof. Specific examples of salts include hydrochlorides and sulfates. One of these specific couplers may be used alone, or two or more may be used in combination. Since oxidation dyes can vary the color tone of hair, they are preferably composed of at least one dye intermediate selected from the above specific examples and at least one coupler selected from the above specific examples. The first agent may contain, as appropriate, a dye other than the above-mentioned oxidation dye, for example, an oxidation dye listed in the "Standards for Quasi-drug Raw Materials" (published June 2006, Yakuji Nipposha).

[0074] The lower limit of the content of the oxidative dye in the hair dye can be set as appropriate, but 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 the oxidative dye is 0.01% by mass or more, the color can be particularly improved. The upper limit of the content of the oxidative dye in the hair dye can be set as appropriate, but 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 the oxidative dye is 10% by mass or less, the solubility in the solubilizer can be improved, especially when a solubilizer is used. Ranges that combine the above upper and lower limits are also contemplated.

[0075] Furthermore, the first agent may further contain ingredients other than those mentioned above, such as ingredients contained in the first and second agents of the hair bleaching / staining agent, as needed. Next, a method for using the oxidizing agent-containing composition of this embodiment will be described below.

[0076] The above-mentioned agents are mixed at the time of use to prepare a mixture. The mixture is prepared by adding predetermined amounts of each agent to a sealed container of a predetermined volume that can be liquid-tightly closed, and shaking and mixing. From the viewpoint of ease of mixing operation, shaking and mixing using a cylindrical sealable container of preferably 100 to 300 mL is preferred. Furthermore, from the viewpoint of improving mixing properties, the total amount of the mixture in the container is preferably 20 to 80% by volume of the content of the sealed container. Shaking and mixing using a sealed container into which each agent has been added may be performed manually by reciprocating up and down and left and right, or by rotation, or may be performed mechanically using a vibrator or the like.

[0077] The mixing ratio of the first and second parts of a two-part composition is set as appropriate, but when the mass of the first part is taken as 1, the lower limit of the mass of the second part is preferably 0.5 or more, more preferably 0.7 or more. When the mass of the first part is taken as 1, the upper limit of the mass of the second part is preferably 3 or less, more preferably 2 or less. Ranges that combine the above upper and lower limits are also envisioned. By specifying such ranges, mixing properties can be further improved.

[0078] The formulation of the mixture is not particularly limited as long as it is a formulation that can be applied to hair, and specific examples include a formulation at 25°C in a liquid form such as an aqueous solution or emulsion, a gel, a foam, or a cream. From the viewpoint of ease of application with a brush or comb, improved spreadability and adhesion to hair, and excellent application operability, a cream, paste, emulsion, or gel form is preferred. The obtained mixture is applied to hair in the required amount using thinly gloved hands, an applicator such as a comb, brush, or applicator, or a container with a lid or comb-attached outlet.

[0079] After the mixture has been applied to the hair, a predetermined time period is passed, and then a step of rinsing the mixture applied to the hair with water is carried out according to a conventional method. Next, a step of washing the hair using a shampoo composition according to a conventional method and rinsing with water is carried out, preferably according to a conventional method. The shampoo composition is not particularly limited as long as it is used for washing hair, and known shampoo compositions can be used. Next, a step of rinsing the hair using a rinse composition according to a conventional method and rinsing with water is carried out, preferably according to a conventional method. The rinse composition is not particularly limited as long as it is used for rinsing hair, and known rinse compositions can be used. For the treatment step using the rinse composition, known rinse compositions can be used. Next, a step of drying the hair is carried out, preferably according to a conventional method.

[0080] The oxidizing agent-containing composition used as a hair bleach / decolorizing agent or hair dye of the above embodiment can provide the following effects. (1) The oxidizing agent-containing composition of this embodiment contains, in addition to the oxidizing agent (d), predetermined amounts of the components (a), (b), and (c). Therefore, the emulsion stability of the oxidizing agent-containing composition can be maintained while improving the mixability with other agents by shaking. Even when the component (a) is blended in large amounts to improve bleaching, dyeing, or hair dyeing power, a decrease in emulsion stability can be suppressed.

[0081] (2) In this embodiment, when the oxidizing agent-containing composition contains one or more of (e) polyoxyethylene polyoxypropylene alkyl ether, polyoxyalkylene polyhydric alcohol fatty acid ester, polyhydric alcohol fatty acid ester (except when it corresponds to the above-mentioned component (c)), polyoxyalkylene hydroxy fatty acid ether, and polyoxyalkylene sterol ether, the emulsion stability and miscibility with other agents of the oxidizing agent-containing composition are further improved. In particular, the miscibility with other agents is improved without decreasing the viscosity of the oxidizing agent-containing composition.

[0082] (3) In this embodiment, when an N-acyltaurine salt is contained as component (b), emulsion stability is further improved. (4) Generally, when a hair bleach / decolorizing agent or hair dye is composed of a first agent and a second agent, mixing efficiency can be improved by mixing the first agent and the second agent in an excess of two agents, for example, a first agent:second agent ratio of more than 1:3 (by mass). However, in this case, the amount of components derived from the first agent in the mixture, such as dyes and conditioning components, becomes relatively small. As a result, it may be difficult to create a color that thoroughly dyes gray hair, and the effect of improving the feel may not be efficiently achieved.

[0083] In this embodiment, even when the mixing ratio of the first agent and the second agent in the hair bleaching / dyeing agent or hair dye is 1:0.5 to 3 by mass, the mixing efficiency is not reduced, and the content of the components contained in the first agent in the mixture is not reduced more than necessary, so that the efficacy of the components in the first agent can be effectively exerted.

[0084] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility. The hair dye may contain, as a dye other than the above-mentioned oxidation dye, a direct dye listed in the "Standards for Quasi-drug Raw Materials" (published June 2006, Yakuji Nipposha) as appropriate, within the range that does not impair the effects of the present invention.

[0085] In the oxidizing agent-containing composition of the above embodiment, each of the components (a) to (e) may be blended in the oxidizing agent-containing composition during storage, and some of the other components constituting each agent may be formulated as separate formulations, further increasing the number of dosage forms. Even in such a configuration, emulsion stability and mixability can be improved.

[0086] As long as the effects of the present invention are achieved, the hair bleaching / dyeing agent or hair dye of the above embodiment may have some of the components contained in each agent constituting the above-mentioned hair bleaching / dyeing agent or hair dye formulated as a separate agent, thereby increasing the number of formulations.

[0087] For example, the first agent of the above-mentioned hair bleaching / decoloring agent or hair dye may be composed of separate agents, each containing an alkaline agent and a component other than the alkaline agent, or may be composed of a multi-agent hair bleaching / decoloring agent or hair dye, further comprising a component containing an oxidizing aid such as a persulfate, percarbonate, or perborate. [Example]

[0088] Next, the above-described embodiment will be described in more detail with reference to examples and comparative examples. Note that the present invention is not limited to the configurations described in the examples section. Hereinafter, Examples 1 to 3 and 14 to 20 shall be replaced with Reference Examples 1 to 3 and 14 to 20. Furthermore, Formulation Examples 1 and 2 shall be replaced with Reference Formulation Examples 1 and 2. A first agent of an oxidation hair dye and a second agent as an oxidizing agent-containing composition were prepared, each containing the components shown in Tables 1 to 3. The numerical value in the column showing each component in each table indicates the content of that component in that column, and its unit is mass %. The notations "a" to "d" in the tables indicate compounds corresponding to each of the components (a) to (d) described in the claims of the present application. "b / a" indicates the mass ratio of the content of component (b) to the content of component (a). The numerical value of EO in the compound name indicates the number of moles of ethylene oxide added. The numerical value of PO indicates the number of moles of propylene oxide added.

[0089] The viscosity of the second part at 25°C was measured using a BL-type viscometer (manufactured by Toki Sangyo Co., Ltd.) as a B-type viscometer, using a No. 1 rotor for viscosities of 100 to 250 mPa·s, a No. 2 rotor for viscosities of 250 to 2500 mPa·s, and a No. 3 rotor for viscosities of 2500 mPa·s or more, all at a rotation speed of 12 rpm. The viscosity of the second part is shown in the "Viscosity" column in the table.

[0090] The emulsion stability of the second agent and its miscibility with the first agent were evaluated by the methods described below. (Emulsification stability) The emulsion stability of the liquid second agent was evaluated by placing it in a transparent glass container, leaving it at 60°C for one day, and then visually assessing the degree of separation of the second agent by five panelists. Scoring was performed on a five-point scale: excellent (5 points) for no separation, good (4 points) for almost no separation, fair (3 points) for very little separation, slightly poor (2 points) for moderate separation, and poor (1 point) for significant separation. The panelists' scores were averaged, and the evaluation results were determined as follows: 4.6 points or higher = "excellent" (5); 3.6 points to less than 4.6 points = "good" (4); 2.6 points to less than 3.6 points = "fair" (3); 1.6 points to less than 2.6 points = "slightly poor" (2); and less than 1.6 points = "poor" (1).

[0091] (mixability) The first and second agents were placed in a cylindrical, sealed resin container (inner diameter 40 mm x height 140 mm) in a mass ratio of 1:1.5, and the container was manually shaken up and down 30 times with an amplitude of approximately 30 cm.

[0092] 0.2 g of the mixture was weighed onto a glass plate, and the mixture was sandwiched between another glass plate. Five panelists visually checked for the presence of undissolved residue and evaluated the mixability using the following criteria: Excellent (5 points) for no unevenness or undissolved residue, Good (4 points) for almost no unevenness or undissolved residue, Fair (3 points) for very little unevenness or undissolved residue, Fair (2 points) for slightly more unevenness or undissolved residue, and Poor (1 point) for much unevenness or undissolved residue. The average score of each panelist was calculated, and the evaluation results were determined as follows: an average score of 4.6 or more was "excellent: 5", 3.6 to less than 4.6 was "good: 4", 2.6 to less than 3.6 was "fair: 3", 1.6 to less than 2.6 was "slightly poor: 2", and less than 1.6 was "poor: 1". The results are shown in the table below.

[0093] Furthermore, the brightness and oily feeling were evaluated by the following methods. Immediately after preparation, the oxidative hair dye mixture obtained in the mixability evaluation was applied to a black wig (Bealux Co., Ltd., Queen Cut No. 775S) while combing it with a comb and pressing the container with a comb equipped with a discharge nozzle. The mixture was left at 30°C for 15 minutes. Next, the oxidative hair dye adhering to the wig was rinsed with 40°C water for 30 seconds, and the wig was then shampooed twice (Hoyu Co., Ltd., Bigen Treatment Shampoo as the shampoo composition) and rinsed once (Hoyu Co., Ltd., Bigen Treatment Rinse as the rinse composition). The shampoo composition and rinse composition were each rinsed away with water after each treatment. The wig was then dried with warm air and left for one day.

[0094] (brightness) Five panelists visually evaluated the brightness of the wigs after dyeing in each of the above examples under a standard light source, using the following criteria to determine whether the brightness was excellent or not. Scoring was done on a five-point scale: excellent (5 points), good (4 points), fair (3 points), slightly poor (2 points), and poor (1 point). The panelists' scores were averaged, and an average of 4.6 points or more was designated "excellent: 5," 3.6 points or more but less than 4.6 points was designated "good: 4," 2.6 points or more but less than 3.6 points was designated "fair: 3," 1.6 points or more but less than 2.6 points was designated "slightly poor: 2," and less than 1.6 points was designated "poor: 1." The results are shown in the table below.

[0095] (Greasy feeling) Five panelists evaluated the oily feeling immediately after rinsing each mixed solution attached to the wig with 40°C water for 30 seconds and before washing with shampoo, and judged whether the oily feeling was excellent or not by using the following criteria: Excellent (5 points) when no oily feeling was felt, Good (4 points) when almost no oily feeling was felt, Fair (3 points) when very little oily feeling was felt, Slightly poor (2 points) when oily feeling was felt, and Poor (1 point) when a strong oily feeling was felt. The average score of each panelist was calculated, and the evaluation results were determined as follows: an average score of 4.6 or more was "excellent: 5", 3.6 to less than 4.6 was "good: 4", 2.6 to less than 3.6 was "fair: 3", 1.6 to less than 2.6 was "slightly poor: 2", and less than 1.6 was "poor: 1". The results are shown in the table below.

[0096] [Table 1]

[0097] [Table 2]

[0098] [Table 3] As shown in Tables 2 and 3, it was confirmed that each Example achieved a satisfactory result or better for each evaluation item. It was also confirmed that blending component (e) could improve mixability without lowering viscosity. As shown in Table 3, it was confirmed that Comparative Example 1, which did not contain component (b), was inferior to each Example, particularly in emulsion stability. Comparative Example 2, which did not contain component (c), was inferior to each Example, particularly in emulsion stability. Comparative Example 3, in which the viscosity of the second part was 9000 mPa·s, was inferior to each Example, particularly in mixability. Comparative Example 4, in which the viscosity of the second part was 4 mPa·s, was inferior to each Example, particularly in emulsion stability. Comparative Examples 5 and 6, in which the second part contained less than 4% by mass of component (a), were inferior to each Example, particularly in brightness.

[0099] (Prescription example) Examples of formulations for the oxidation hair dye of the present invention are shown below. Formulation Examples 1 and 2 constituted the second agents of the oxidation hair dyes shown in Table 4. Evaluations were carried out in the same manner as in Example 1, and it was confirmed that the second agents of Formulation Examples 1 and 2 were excellent in emulsion stability, mixability, brightness, and oily feeling, just like Example 1.

[0100] [Table 4]

Claims

1. An oxidizing agent-containing composition comprising the following components (a) to (e) and having a viscosity of 100 mPa·s or more and 8000 mPa·s or less at 25°C, the oxidizing agent-containing composition being used as a hair bleaching / dyeing agent or a hair dyeing agent by mixing with other agents by shaking: (a) The content of liquid oil components at 25°C is 4% by mass or more (b) at least one anionic surfactant selected from alkyl ether sulfates, alkyl sulfates, alkyl ether sulfate ester salts, alkenyl ether sulfates, alkenyl sulfates, olefin sulfonates, alkanesulfonates, α-sulfonic acid salts, N-acyl amino acid surfactants, sulfosuccinate esters, and N-acyltaurine salts; (c) Glycerin fatty acid ester with an HLB value of 6.0 or less (d) oxidizing agent (e) One or more of polyoxyethylene polyoxypropylene alkyl ethers, polyoxyalkylene polyhydric alcohol fatty acid esters, polyhydric alcohol fatty acid esters (excluding those corresponding to the above-mentioned component (c)), polyoxyalkylene hydroxy fatty acid ethers, and polyoxyalkylene sterol ethers, each having an HLB value of 9.5 or more.

2. 2. The oxidizing agent-containing composition according to claim 1, wherein the (c) glycerin fatty acid ester is a lipophilic monoglycerin fatty acid ester.

3. 3. The oxidizing agent-containing composition according to claim 1, wherein the anionic surfactant (b) comprises an N-acyltaurine salt.

4. The oxidizing agent-containing composition according to any one of claims 1 to 3, wherein the other agent is an agent containing an alkaline agent, and a mixing ratio of the agent containing an alkaline agent to the oxidizing agent-containing composition during use is 1:0.5 to 1:3 in terms of mass ratio.

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