Two-component oxidative hair dye or bleaching composition and method for dyeing or bleaching hair

Abstract

To provide a two agent-type oxidative hair dye / bleach composition that has sufficient hair dye / bleach effect, and can reduce skin irritation (e.g. stinging / scratchy feeling) caused by an alkali agent and an oxidizing agent during hair treatment.SOLUTION: A composition of this invention is a two agent-type oxidative hair dye / bleach composition that contains a first agent containing an alkali agent and a second agent containing an oxidizing agent; one of the first and second agents is an oil-in-water (O / W) emulsion and the other is a water in-oil (W / O) emulsion.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a two-component oxidative hair dyeing or bleaching composition used in oxidative dyeing of hair, and a hair dyeing or bleaching method using said composition. [Background technology]

[0002] Two-component oxidative hair dyes consist of a first component containing an alkaline agent or oxidative dye as the main ingredient, and a second component containing an oxidizing agent such as hydrogen peroxide. The first and second components are mixed together during the hair dyeing process. The oxidative power generated when these components are mixed promotes both a bleaching effect by destroying the melanin in the hair and a color development effect by the polymerization of the oxidative dye. Furthermore, products that do not contain an oxidative dye in the first component are used as bleaches. However, both alkaline agents and hydrogen peroxide are ingredients that can be irritating to the human body.

[0003] In recent years, hair colorants have often been formulated with ammonia as an alkaline agent due to concerns about their dyeing properties and hair damage. Ammonia has a lower molecular weight than other alkaline agents, such as organic amines like monoethanolamine. Therefore, when ammonia is used as an alkaline agent, it has good dyeing and bleaching properties, but it also has problems such as a pungent odor due to its high volatility, and its high penetration into the scalp and skin can cause skin irritation (a temporary irritation that is not an allergy) during hair coloring.

[0004] To address these problems, attempts have been made to improve the cream base by adjusting the particle size of the cream base, incorporating polycondensation polymer particles having hydroxyl groups, etc. However, although these methods can suppress the irritating odor of ammonia, they are still insufficient in suppressing skin irritation such as the tingling and prickling sensations caused by alkaline agents and oxidizing agents (e.g., Patent Documents 1 and 2).

[0005] In addition, attempts have been made to reduce skin irritation by incorporating ingredients such as plant extracts into hair colorants. However, the main purpose of this method is to care for damaged skin, and it is not intended to actively prevent the effects of irritants on the skin. As a result, the effect of reducing skin irritation is still insufficient (for example, Patent Document 3).

[0006] Another method proposed is to apply liquid oil to the scalp as a pretreatment before hair coloring, thereby preventing irritating components from the oily film from directly adhering to the skin. However, this method has problems such as skin irritation easily occurring when the liquid oil is applied unevenly, and poor workability due to the need for pretreatment.

[0007] As mentioned above, it is known that temporary skin irritation during hair coloring can be reduced by using a protective treatment with oily ingredients. This is thought to be because the irritants contained in hair coloring agents, such as alkaline agents (especially ammonia) and hydrogen peroxide, are water-soluble ingredients, and the oily film formed by the protective treatment beforehand prevents their action on the skin and scalp.

[0008] Furthermore, water-in-oil emulsions (W / O: water-in-oil) are well known as emulsions commonly used in the cosmetics field. These emulsions have an oil-based continuous phase (external phase) and are often used when water resistance is required. However, it is generally known that hair colorants composed of W / O emulsions, while effective in suppressing skin irritation caused by alkaline agents and oxidizing agents, have poor hair dyeing properties, which are an inherent characteristic of hair colorants (e.g., Patent Documents 4 and 5). This decline in hair dyeing properties is thought to be due to the fact that the continuous phase of W / O emulsions is composed of oily components, which prevents water, which acts as a medium for active ingredients such as oxidative dyes and oxidizing agents, from penetrating into the hair.

[0009] Therefore, Patent Document 4 discloses a hair cosmetic containing specific ingredients for the purpose of further reducing the irritating odor of ammonia and improving hair brightness. The formulation of the first bleaching agent as a hair cosmetic is a water-in-oil emulsion or an O / W emulsion, but it is described that an O / W emulsion is preferred because it provides excellent emulsion stability, further reduces the irritating odor of the bleaching mixture, and further improves hair brightness.

[0010] Furthermore, the above-mentioned Patent Document 5 discloses a dyeing composition containing predetermined components as a dyeing composition that maintains excellent color-developing power while reducing the irritating odor and eye irritation caused by alkaline agents. Specifically, it describes that the above-mentioned problems can be solved by each component partially capturing the dye, alkaline agent, and oxidizing agent (hydrogen peroxide, etc.) present in the aqueous phase, that is, by distributing part of the aqueous phase between the internal and external phases of the emulsion while forming an O / W emulsion. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-226342 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-130233 [Patent Document 3] Japanese Patent Application Laid-Open No. 2009-256222 [Patent Document 4] Japanese Patent Application Laid-Open No. 2005-23001 [Patent Document 5] Special Publication No. 2014-533686 Summary of the Invention [Problem to be solved by the invention]

[0012] Skin irritation, such as the tingling and prickling sensation caused by hair color, is often a problem when dyeing gray hair (especially when dyeing only gray hair near the roots, which is called retouch color). In such cases, the challenge is to achieve both reduced skin irritation and dyeability (dark dyeing).

[0013] Furthermore, one of the purposes of using hair color is to enjoy a variety of colors according to the preferences of the user (the person applying the color and the person receiving the color). For this reason, it is recommended to develop a variety of colors in a well-balanced manner using various oxidation dyes.

[0014] The present invention has been made in view of the above circumstances, and its object is to provide a two-component oxidative hair dye or bleach composition that provides sufficient hair dyeing or bleaching properties and reduces skin irritation (such as tingling or prickling sensations) caused by alkaline agents and oxidizing agents during hair dyeing or bleaching procedures, and a hair dyeing or bleaching method using said composition. More preferably, the object is to provide a two-component oxidation hair dyeing or bleaching composition that can develop well-balanced colors with various oxidation dyes, and a hair dyeing or bleaching method using said composition. [Means for solving the problem]

[0015] The present invention has the following features that have solved the above problems. [1] A two-component oxidative hair dye or bleach composition consisting of a first agent containing an alkaline agent and a second agent containing an oxidizing agent, A two-component oxidative hair dye or bleach composition, in which one of the first and second components is an oil-in-water (O / W) emulsion and the other is a water-in-oil (W / O) emulsion. [2] The two-component oxidative hair dye or bleach composition according to [1] above, wherein the alkaline agent is ammonia and / or a salt thereof. [3] The two-component oxidative hair dye or bleach composition according to [2] above, wherein the amount of ammonia and / or its salts blended is 0.1 to 3% by mass based on the total amount of the two-component oxidative hair dye or bleach composition. [4] A two-agent oxidative hair dye or bleach composition according to any one of [1] to [3] above, wherein the first agent is an oil-in-water (O / W) emulsion and the second agent is a water-in-oil (W / O) emulsion. [5] A method for dyeing or bleaching hair using the two-component oxidative hair dye or bleach composition described in any one of [1] to [4] above. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a hair dyeing or bleaching treatment that has good hair dyeing or bleaching properties and reduces skin irritation (such as tingling or prickling sensations) during the treatment. Furthermore, the present invention can provide a hair dyeing treatment that can produce a variety of colors with a better balance using various oxidation dyes. DETAILED DESCRIPTION OF THE INVENTION

[0017] In order to solve the above-mentioned problems, the present inventors conducted research, particularly focusing on Patent Documents 4 and 5. As mentioned above, these publications express a negative view of W / O emulsions. However, the inventors' research revealed that when an O / W emulsion is used as the basic structure rather than a W / O emulsion, the skin irritation reduction effect is not fully exerted. Further research led to the unexpected discovery that using a composition in which one of the first and second agents is an oil-in-water (O / W) emulsion and the other is a water-in-oil (W / O) emulsion maintains good hair dyeing and bleaching properties while further improving the skin irritation reduction effect compared to a composition in which both the first and second agents are O / W emulsions, thereby completing the present invention.

[0018] As described above, the composition of the present invention actively uses W / O emulsions, which have been rejected as coloring agents in the prior art, and is characterized by the fact that, unlike Patent Documents 4 and 5 mentioned above, the emulsion forms of the first and second agents are limited, i.e., the first and second agents are configured with different emulsion forms. Up until now, the idea of ​​changing the emulsion form between the first and second agents had never even been considered. Considering that previous studies, such as those in Patent Documents 4 and 5, have preferred the emulsion form of an O / W emulsion rather than a W / O emulsion, and have only considered the constituent components within the scope of the basic skeleton of an O / W emulsion, the present invention can be said to be an invention born from a completely novel concept.

[0019] The present invention will be described in detail below.

[0020] The two-part oxidative hair dye or bleach composition of the present invention is a two-part oxidative hair dye or bleach composition consisting of a first part containing an alkaline agent and a second part containing an oxidizing agent, characterized in that one of the first and second parts is an oil-in-water (O / W) emulsion and the other is a water-in-oil (W / O) emulsion. This allows for the production of a composition that is excellent in reducing skin irritation while maintaining good hair dyeing and bleaching properties. In particular, compositions in which the first agent is an oil-in-water (O / W) emulsion and the second agent is a water-in-oil (W / O) emulsion are preferred, as this not only further enhances hair dyeing and bleaching properties, but also allows for a more balanced development of various colors with various oxidative dyes.

[0021] In the present invention, a "two-component oxidative hair dye or bleach composition" is one in which the first and second components are mixed together at the time of use. A "two-component oxidative hair dye composition" is one in which an oxidative dye is blended in the first component, and a "two-component bleach composition" is one in which an oxidative dye is not blended in the first component, and the composition of the present invention includes both of these.

[0022] In the present invention, "excellent hair dyeing ability" means that, for example, gray hair can be dyed to a deep brown color, as shown in the Examples section below. On the other hand, in the present invention, "excellent bleaching ability" means that, for example, black hair can be bleached to a yellowish brown color, as shown in the Examples section below.

[0023] As mentioned above, the composition of the present invention uses a W / O emulsion, which is considered unsuitable for oxidative hair dyes, and is characterized by the fact that the first and second agents have different emulsification forms, with one of the first and second agents being an oil-in-water (O / W) emulsion and the other being a water-in-oil (W / O) emulsion. Specifically, the composition of the present invention is composed of either an O / W emulsion first agent and a W / O emulsion second agent, or a W / O emulsion first agent and an O / W emulsion second agent. O / W emulsions are emulsions in which the continuous phase (external phase) is water, while W / O emulsions are emulsions in which the continuous phase (external phase) is oil. These emulsion forms can be confirmed by measuring electrical conductivity. Specifically, when an electric current is measured using an electrical tester to see if an electric current flows, it is confirmed to be an "O / W emulsion" if an electric current flows (the continuous phase is composed of water and water-soluble components, so the electric current is not generated). On the other hand, if no current flows, it is confirmed to be a "W / O emulsion." (Current does not flow because the continuous phase is made of oil.)

[0024] When the first agent is used as a hair dye, the basic components are an alkaline agent, an oxidative dye, an oily component, and a surfactant. If necessary, additives such as solvents, stabilizers, conditioning components, fragrances, extracts, and pH adjusters can be added. When the first agent is used as a bleaching agent, the basic components are the same as those of a hair dye, except that it does not contain an oxidative dye.

[0025] The second agent is basically composed of an oxidizing agent, an oily component, and a surfactant. If necessary, additives such as solvents, stabilizers, conditioning components, fragrances, extracts, and pH adjusters can be added.

[0026] The alkaline agent used in the first agent is not particularly limited as long as it is one that is commonly used in two-agent oxidative hair dyes or bleaches, and examples thereof include ammonia and / or its salts, monoethanolamine and / or its salts, triethanolamine and / or its salts, and 2-amino-2-methyl-1-propanol and / or its salts.

[0027] Among these, ammonia and / or its salts are preferred because they penetrate hair well, providing excellent dyeing properties, and are highly volatile, meaning they do not remain on the hair, thereby minimizing damage to the hair after treatment. Ammonia and / or its salts may be used alone or in combination. The amount of ammonia and / or its salts in the two-component oxidative hair dye or bleach composition (i.e., when the total of the first and second components is taken as 100% by mass) is preferably 0.1 to 3% by mass (when a single component is used, this is the amount of that component alone; when two or more components are used in combination, this is the total amount). If the amount is less than 0.1% by mass, the above-mentioned effects cannot be achieved. On the other hand, if the amount exceeds 3% by mass, further improvement in hair dyeing or bleaching properties cannot be expected, and problems such as hair damage and the inability to maintain the effect of reducing skin irritation may occur.

[0028] When the first agent is used as a hair dye, it contains an oxidative dye. The type of oxidative dye is not particularly limited as long as it is one commonly used in two-component oxidative hair dyes, and examples include paraphenylenediamine, toluene-2,5-diamine, and paraaminophenol. If necessary, a coupler can be added. Examples of such couplers include α-naphthol, resorcinol, meta-aminophenol, 2,4-diaminophenoxyethanol, para-amino orthocresol, and 5-(2-hydroxyethylamino)-2-methylphenol. In addition to the above, oxidative dyes listed in the "Standards for Quasi-Drug Ingredients 2006" (Yakuji Nipposha) can also be used as appropriate. In addition to the above, acid dyes (e.g., Red No. 106), basic dyes (e.g., Basic Yellow 57), and HC dyes can also be added. These can be used alone or in combination. The amount of the oxidative dye in the two-component oxidative hair dye or bleach composition as a whole is not particularly limited, and should be within the range typically used for formulating such compositions.

[0029] The oxidizing agent used in the second agent is not particularly limited as long as it is one typically used in two-agent oxidative hair dye or bleach compositions. Examples include hydrogen peroxide, persulfates (e.g., ammonium persulfate, sodium persulfate, etc.), perborates (e.g., sodium perborate, etc.), percarbonates (e.g., sodium percarbonate, etc.), and bromates (e.g., sodium bromate, potassium bromate, etc.). Of these, hydrogen peroxide is preferably used because of its high oxidizing power and excellent dye color development, but other oxidizing agents can also be used in combination with hydrogen peroxide as auxiliary oxidizing agents. These may be used alone or in combination. The amount of the oxidizing agent in the entire two-agent oxidative hair dye or bleach composition (this is the amount of the oxidizing agent when used alone, and the total amount when used in combination of two or more) is preferably 0.5 to 6% by mass. If the blending amount is less than 0.5% by mass, the above-mentioned effects will not be obtained, whereas if the blending amount exceeds 6% by mass, not only will further improvement in hair dyeability and bleaching properties not be expected, but problems will arise such as extreme hair damage and the inability to maintain the effect of reducing skin irritation, etc.

[0030] Next, the components (oil components, surfactants, and additives added as needed) commonly used in the first and second agents will be described.

[0031] The oily component is not particularly limited as long as it is one that is commonly used in two-component oxidative hair dye or bleach compositions, and examples thereof include hydrocarbons, fats and oils, waxes, higher alcohols, higher fatty acids, alkyl glyceryl ethers, esters, silicones, etc. These may be blended alone or in combination of two or more. The amount of the oily component in the entire two-component oxidative hair dye or bleach composition is not particularly limited, and is used within the range typically used for formulating such compositions.

[0032] Among these, examples of hydrocarbons include liquid paraffin, paraffin, light liquid isoparaffin, light isoparaffin, synthetic squalane, squalane, and petrolatum.

[0033] Examples of fats and oils include olive oil, camellia oil, cacao butter, macadamia nut oil, etc.

[0034] Examples of waxes include beeswax, candelilla wax, jojoba oil, and lanolin.

[0035] Examples of higher alcohols include lauryl alcohol, myristyl alcohol, cetostearyl alcohol, and cetyl alcohol.

[0036] Examples of higher fatty acids include lauric acid, behenic acid, stearic acid, palmitic acid, oleic acid, and lanolin fatty acid.

[0037] Examples of alkyl glyceryl ethers include hexadecyl glyceryl ether, oleyl glyceryl ether, octadecyl glyceryl ether, and isostearyl glyceryl ether.

[0038] Examples of esters include isopropyl palmitate, isopropyl myristate, cetyl octanoate, myristyl myristate, and isostearyl myristate.

[0039] Examples of silicones include dimethylpolysiloxane, methylphenylpolysiloxane, polyether-modified silicone, and amino-modified silicone.

[0040] The amount of the oil component blended in the O / W emulsion is preferably 3 to 25% by mass (this is the amount of the oil component blended alone, and the total amount of the oil components blended in combination of two or more), and more preferably 5 to 20% by mass. The amount of the oil component in the W / O emulsion is preferably 30% by mass or less (this is the amount of the oil component when it is blended alone, and the total amount when it is blended in combination with two or more). It is more preferably 25% by mass or less, and even more preferably 20% by mass or less. The lower limit is preferably about 8% by mass.

[0041] The surfactant is not particularly limited as long as it is one that is commonly used in two-component oxidative hair dye or bleach compositions, and any of nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants can be used. The surfactants may be blended alone or in combination of two or more. The amount of the surfactant in the total two-component oxidative hair dye or bleach composition is not particularly limited, and is used within the range typically used for formulating such compositions.

[0042] Among these, nonionic surfactants include, for example, polyoxyethylene (hereinafter referred to as POE) alkyl ethers, POE alkylphenyl ethers, POE sorbitan fatty acid esters, monoglyceryl stearate, polyglyceryl monoisostearate, condensed polyglyceryl ricinoleate, dextrin palmitate, and PEG-30 dipolyhydroxystearate.

[0043] Examples of anionic surfactants include N-stearoylamino acid salts such as sodium N-stearoyl-L-aspartate, sodium lauryl sulfate, sodium tetradecene sulfonate, and sodium cetostearyl sulfate.

[0044] Examples of cationic surfactants include cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, and stearyltrimethylammonium bromide.

[0045] Examples of amphoteric surfactants include cocoamidopropyl betaine and lauryldimethylaminoacetic acid betaine.

[0046] In order to obtain even better dyeability in the present invention, an ionic surfactant is preferably used as the surfactant constituting the O / W emulsion. In this case, it is effective to appropriately control the type of oil component constituting the W / O emulsion.

[0047] For example, when the surfactant constituting the O / W emulsion is an anionic surfactant, the oil component constituting the counterpart W / O emulsion is preferably a hydrocarbon, a higher alcohol, or an ester, used alone or in combination of two or more thereof, and the use of a hydrocarbon with low polarity is particularly preferred.

[0048] Furthermore, when the surfactant constituting the O / W emulsion is a cationic surfactant, the oily component constituting the counterpart W / O emulsion is preferably a higher alcohol, an ester, or a fat or oil (vegetable oil), used alone or in combination of two or more thereof, and the use of vegetable oils with high polarity is particularly preferred.

[0049] The amount of the surfactant blended in the O / W emulsion is preferably 0.5 to 15 mass % (this is the amount of the surfactant when blended alone, and the total amount when blended in combination of two or more surfactants), and more preferably 1 to 10 mass %. The amount of the surfactant blended in the W / O emulsion is preferably 1 to 15 mass % (this is the amount of the surfactant when blended alone, and the total amount when blended in combination of two or more surfactants), and more preferably 2 to 10 mass %.

[0050] If necessary, the following components may also be contained.

[0051] A stabilizer is added to maintain the stability of the oxidative hair dye or bleach of the present invention. The stabilizer is not particularly limited as long as it is one that is commonly used in two-component oxidative hair dye or bleach, and examples thereof include sodium ascorbate, sodium sulfite, tetrasodium edetate, hydroxyethanediphosphonic acid, magnesium sulfate, etc. The stabilizers may be added alone or in combination of two or more.

[0052] The solvent is not particularly limited as long as it is one that is commonly used in two-component oxidative hair dyes or bleaches, and examples thereof include 1,3-butylene glycol, concentrated glycerin, polyethylene glycol, etc. The above solvents may be blended alone or in combination of two or more.

[0053] Furthermore, additives such as conditioning ingredients, fragrances, extracts, etc. may be appropriately blended in order to scent the oxidative hair dye or bleach of the present invention or to embody its concept, etc. These are not particularly limited as long as they are those typically used in two-component oxidative hair dye or bleach products.

[0054] Furthermore, it is generally preferable to add a pH adjuster to the second agent to control the pH to within the range of 2 to 4.

[0055] In the composition of the present invention, the first agent preferably has the above-mentioned structure in an O / W emulsion form, and the second agent preferably has a W / O emulsion form, which not only further enhances hair dyeing and bleaching properties but also allows for a variety of oxidative dyes to produce a variety of colors in a more balanced manner.

[0056] The present invention also encompasses a method for dyeing or bleaching hair using the two-part oxidative hair dye or bleach composition described above. By mixing the first and second parts and applying them to hair, it is possible to provide a hair dyeing or bleaching treatment that achieves sufficient hair dyeing or bleaching without causing any skin irritation (such as a tingling or prickling sensation) during the treatment. [Example]

[0057] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples and can be practiced with modifications within the scope of the above and below-described aims, all of which are included within the technical scope of the present invention. In the following, "%" means "% by mass" unless otherwise specified.

[0058] Example 1 (Preparation of First Agents 1 to 9) First Agents-1 to 4 (oxidative hair dye, with oxidative dye, O / W emulsion) shown in Table 1 were prepared as follows. First, to prepare the aqueous phase, the stabilizer and dye shown in the table were added to an appropriate amount of purified water and heated to 80°C to dissolve. Next, to prepare the oil phase, the oily components and surfactants shown in the table were mixed and dissolved at 80°C. Next, the oil phase was added dropwise to the aqueous phase, mixed and emulsified, and then cooled to approximately 40°C. After cooling, an alkali agent was added as needed and further stirred to achieve uniformity, thereby preparing a first agent composition.

[0059] Additionally, first agents 5 to 7 (oxidative hair dye, with oxidative dye, W / O emulsion) shown in Table 1 were prepared as follows. First, to prepare the aqueous phase, the solvent, stabilizer, and dye shown in the table were added to an appropriate amount of purified water and heated to 80°C to dissolve. Next, to prepare the oil phase, the oily components and surfactants shown in the table were mixed and dissolved at 80°C. Next, the aqueous phase was added dropwise to the oil phase, mixed and emulsified, and then cooled to approximately 40°C. After cooling, an alkali agent was added as needed and further stirred to achieve uniformity, thereby preparing a first agent composition.

[0060] Also, First Agent-8 (o / w emulsion without bleaching agent or oxidation dye) shown in Table 1 was prepared as follows. First, to prepare the aqueous phase, the stabilizer shown in the table was added to an appropriate amount of purified water and heated to 80°C to dissolve. Next, to prepare the oil phase, the oily component and surfactant shown in the table were mixed and dissolved at 80°C. Next, the oil phase was added dropwise to the aqueous phase, mixed and emulsified, and then cooled to approximately 40°C. After cooling, an alkali agent was added appropriately and further stirred to achieve uniformity, thereby preparing a first agent composition.

[0061] Furthermore, First Agent-9 (no bleaching agent or oxidation dye, W / O emulsion) shown in Table 1 was prepared as follows. First, to prepare the aqueous phase, the solvent and stabilizer shown in the table were added to an appropriate amount of purified water and heated to 80°C to dissolve. Next, to prepare the oil phase, the oily components and surfactants shown in the table were mixed and dissolved at 80°C. Next, the aqueous phase was added dropwise to the oil phase, mixed and emulsified, and then cooled to approximately 40°C. After cooling, an alkali agent was added as needed and further stirred to achieve uniformity, thereby preparing a first agent composition.

[0062] (Preparation of second agents 1 to 5) The second agents 1 and 2 (O / W emulsions) shown in Table 2 were prepared as follows. First, to prepare the aqueous phase, the stabilizers and pH adjusters shown in the table were added to an appropriate amount of purified water, and the mixture was heated to 80°C and dissolved. Next, to prepare the oil phase, the oily components and surfactants shown in the table were mixed and dissolved at 80°C. Next, the oil phase was added dropwise to the aqueous phase, mixed and emulsified, and then cooled to approximately 40°C. After cooling, 35% hydrogen peroxide water was added and further stirred to achieve uniformity, thereby preparing a second agent composition.

[0063] Additionally, second agents 3 to 5 (W / O emulsions) shown in Table 2 were prepared as follows. First, to prepare the aqueous phase, the solvent, stabilizer, and pH adjuster shown in the table were added to an appropriate amount of purified water and heated to 80°C to dissolve. Next, to prepare the oil phase, the oily components and surfactants shown in the table were mixed and dissolved at 80°C. Next, the aqueous phase was added dropwise to the oil phase, mixed and emulsified, and then cooled to approximately 40°C. After cooling, 35% hydrogen peroxide water was added and further stirred to achieve uniformity, to prepare a second agent composition.

[0064] (Preparation of two-component oxidative hair dye or bleach composition) Each of the first agents listed in Table 1 and each of the second agents listed in Table 2 obtained as described above were mixed at a mass ratio of 1:1 to obtain each composition.

[0065] (Evaluation method) (1) Evaluation of hair dyeability A mixture of each of the first agents (Agents 1 to 7; containing oxidation dye) listed in Table 1 and each of the second agents (Agents 1 to 5) listed in Table 2 was applied to a strand of human hair (10 cm, 1.0 g, 100% gray hair) that had not undergone any chemical treatment (such as oxidation dyeing or bleaching) and left at 35°C for 30 minutes. The strand was then rinsed with water and a 10% aqueous solution of triethanolamine lauryl sulfate, and then air-dried. After air-drying, the degree of dyeing of the hair strand was visually observed by a panel of 10 experts and evaluated according to the following criteria, and an average score was calculated. Depending on the degree of dyeing of the hair strand, the color changed from gray hair to light brown to dark brown.

[0066] (Evaluation criteria for hair dyeability) 3 points: Excellent dyeability (dyeing to a deep brown) 2 points: Good dyeability (dyes light brown) 1 point: Poor dyeability (light dye) (Average score criteria) ◎: 2.5 points or more, 3.0 points or less ○: 2.0 points or more, less than 2.5 points △: 1.5 points or more, less than 2.0 points ×: Less than 1.5 points

[0067] (2) Evaluation of decolorization A mixture of each of the first agents (agents 8 and 9; no oxidation dye) listed in Table 1 and each of the second agents (agents 1 to 5) listed in Table 2 was applied to a human hair tress (10 cm, 1.0 g, 100% black hair) that had not undergone any chemical treatment (such as oxidation dyeing or bleaching) and left at 35°C for 30 minutes. The tress was then rinsed with water and a 10% aqueous solution of triethanolamine lauryl sulfate, and then air-dried. The degree of bleaching of the hair tress after air-drying was visually observed by a panel of 10 experts and evaluated according to the following criteria, with an average score calculated. Depending on the degree of bleaching, the color of the tress changed from black to dark reddish-brown to brown to yellowish-brown.

[0068] (Evaluation criteria for bleaching) 3 points: Excellent bleaching effect (dark hair is thoroughly lightened to a yellowish brown) 2 points: Good bleaching effect (black hair becomes lighter and turns brown) 1 point: Poor bleaching (black hair becomes slightly lighter and turns reddish brown) (Average score criteria) ◎: 2.5 points or more, 3.0 points or less ○: 2.0 points or more, less than 2.5 points △: 1.5 points or more, less than 2.0 points ×: Less than 1.5 points

[0069] (3) Evaluation of skin irritation (method for evaluating skin irritation on the upper arm) A mixture of each of the first agents (first agents 1 to 9) listed in Table 1 and each of the second agents (second agents 1 to 5) listed in Table 2 was applied to the upper arms of 10 expert panelists (1 cm 2 Each test piece was left on for 30 minutes (approximately 1g per test piece). The presence or absence of skin irritation (stinging, prickling, etc.) was evaluated using the following criteria, and an average score was calculated. A higher average score indicates less skin irritation.

[0070] (Skin irritation evaluation criteria) 3 points: No irritation at all 2 points: Almost no stimulation 1 point: Slightly irritating 0 points: Stimulating (Average score criteria) ◎: 2.5 points or more, 3.0 points or less ○: 2.0 points or more, less than 2.5 points △: 1.5 points or more, less than 2.0 points ×: Less than 1.5 points

[0071] These results are shown in Tables 3 and 4.

[0072] [Table 1]

[0073] [Table 2]

[0074] [Table 3]

[0075] [Table 4]

[0076] From these results, the following can be considered.

[0077] First, we will consider the case where the first agents 1 to 7 (oxidative hair dyes) are used. Among these, First Agents-1 to -4 are examples of O / W emulsions, and when Second Agents-3 to -5, which are W / O emulsions with a different emulsification form from the First Agent, were used as the Second Agent, excellent results were obtained in both hair dyeing ability and skin irritation reduction effect in all examples. In contrast, when Second Agents-1 and -2, which are O / W emulsions with the same emulsification form as the First Agent, were used as the Second Agent, good hair dyeing ability was obtained in all examples, but the effect of reducing skin irritation was poor.

[0078] Similar results were observed when Agents 1-5 to 1-7 (W / O emulsions) were used. That is, when Agent 1 was made of W / O emulsions 5 to 7 and Agent 2 was made of O / W emulsions 1 and 2, which had a different emulsification form from Agent 1, excellent results were obtained in both hair dyeing properties and skin irritation reduction effects in all cases. In contrast, when Agents 2-3 to 2-5, which had the same emulsification form as Agent 1, were used as Agent 2, the skin irritation reduction effect was good in all cases, but hair dyeing properties were poor.

[0079] These results demonstrate that the use of a two-component oxidative hair dye composition in which one of the first and second components is an oil-in-water (O / W) emulsion and the other is a water-in-oil (W / O) emulsion provides both hair dyeing properties and reduced skin irritation. Among the above-mentioned invention examples, when O / W emulsions 1 to 4 were used as the first agent, hair dyeing properties were particularly superior to when W / O emulsions 5 to 7 were used as the first agent. Therefore, it is clear that in the present invention, it is particularly preferable to use an O / W emulsion as the first agent and a W / O emulsion as the second agent.

[0080] Next, we will consider the case where the first agent-8 and 9 (bleaching agent) are used. First Agent-8 is an example of an O / W emulsion, and when Second Agents-3 to 5, which are W / O emulsions with a different emulsification form from the First Agent, were used as the Second Agent, excellent results were obtained in both bleaching and skin irritation reduction. In contrast, when Second Agents-1 and 2, which are O / W emulsions with the same emulsification form as the First Agent, were used as the Second Agent, good bleaching was obtained in all cases, but the effect of reducing skin irritation was poor.

[0081] Similar results were observed when Agent 1-9 (W / O emulsion) was used. That is, when a W / O emulsion was used as the Agent 1 and Agent 2-1 or 2, which were O / W emulsions with a different emulsification form from Agent 1, were used as Agent 2, excellent results were obtained in both bleaching and skin irritation reduction effects in all cases. In contrast, when Agents 2-3 to 2-5, which were W / O emulsions with the same emulsification form as Agent 1, were used as Agent 2, excellent skin irritation reduction effects were obtained in all cases, but bleaching properties were poor.

[0082] These results demonstrate that by using a two-component bleaching composition in which one of the first and second components is an oil-in-water (O / W) emulsion and the other is a water-in-oil (W / O) emulsion, bleaching properties and reduced skin irritation can be achieved simultaneously. Furthermore, it was found that, in the bleaching agents of the present invention, when an O / W emulsion was used as the first agent, the bleaching effect was more pronounced, and when a W / O emulsion was used as the first agent, the effect of reducing skin irritation was more pronounced.

[0083] Example 2 In this example, first agents 1 to 4, 10, and 11 listed in Table 6 (of which 1 to 4 are the same as in Table 1), first agents 12 to 29 listed in Table 7, and second agents 6 to 9 listed in Table 5 were prepared in the same manner as in Example 1 above, and the first and second agents were mixed in a 1:1 (mass ratio) to obtain two-agent oxidative hair dye compositions. The dyeability and skin irritation of the various compositions thus obtained were evaluated in the same manner as in Example 1. The results are shown in Tables 6 and 7. As a result, it was confirmed that compositions satisfying the requirements of the present invention exhibited good dyeability and reduced skin irritation in any combination.

[0084] [Table 5]

[0085] [Table 6]

[0086] [Table 7A]

[0087] [Table 7B]

[0088] Example 3 In this example, first agents 30 to 47 listed in Table 8 and second agents 6 to 9 listed in Table 5 were prepared in the same manner as in Example 1 above, and the first and second agents were mixed in a 1:1 (mass ratio) to obtain two-agent oxidative hair dye compositions. The dyeability and skin irritation of the various compositions thus obtained were evaluated in the same manner as in Example 1. The results are also shown in Table 8. As a result, it was confirmed that compositions satisfying the requirements of the present invention exhibited good dyeability and reduced skin irritation in any combination.

[0089] [Table 8A]

[0090] [Table 8B]

[0091] Example 4 In this example, first agents 3, 48 to 51 (of which 3 is the same as in Table 1) listed in Table 9 and second agents 8 and 9 listed in Table 5 were prepared in the same manner as in Example 1 above, and the first and second agents were mixed in a 1:1 (mass ratio) to obtain two-agent oxidative hair dye compositions. The dyeability and skin irritation of the various compositions thus obtained were evaluated in the same manner as in Example 1. The results are also shown in Table 9. As a result, it was confirmed that compositions satisfying the requirements of the present invention exhibited good dyeability and reduced skin irritation in any combination.

[0092] In particular, it was found that examples in which the amount of ammonia and / or its salts in the two-component hair dye was controlled to 0.1 to 3% by mass (1st Agent-3 and 2nd Agent-8, 1st Agent-3 and 2nd Agent-9, 1st Agent-50 and 2nd Agent-8, 1st Agent-50 and 2nd Agent-9) tended to provide a good balance of good dyeability and reduced skin irritation.

[0093] [Table 9]

[0094] Example 5 In this example, first agents 3, 4, and 52 listed in Table 10 (of which 3 and 4 are the same as in Table 1), as well as second agents 10 to 15 listed in Table 11, and second agents 16 to 33 listed in Table 12 were prepared in the same manner as in Example 1 above, and the first and second agents were mixed in a 1:1 (mass ratio) to obtain two-agent oxidative hair dye compositions. The dyeability and skin irritation of the various compositions thus obtained were evaluated in the same manner as in Example 1. The results are shown in Tables 11 and 12. As a result, it was confirmed that compositions satisfying the requirements of the present invention exhibited good dyeability and reduced skin irritation in any combination.

[0095] Specifically, when the surfactant constituting the O / W emulsion is an anionic surfactant (Agent 1-3), it was confirmed that the effects of reducing staining and skin irritation were further improved in a balanced manner when a less polar hydrocarbon was used as the oil component constituting the corresponding W / O emulsion (Agent 2-10, Agent 2-11, Agent 2-13, Agent 2-14, Agent 2-15) (see Table 11). Furthermore, when the surfactant constituting the O / W emulsion is a cationic surfactant (First Agent-4), it was confirmed that dyeability was further improved by using a highly polar vegetable oil as the oily component constituting the corresponding W / O emulsion (Second Agent-30 to Second Agent-33) (see Table 12).

[0096] [Table 10]

[0097] [Table 11]

[0098] [Table 12A]

[0099] [Table 12B]

[0100] Example 6 In this example, first agents 53 to 56 listed in Table 13, first agents 57 to 60 listed in Table 14, and second agents 6 to 9 listed in Table 5 were prepared in the same manner as in Example 1 above, and the first and second agents were mixed in a 1:1 (mass ratio) to obtain two-agent oxidation hair dye compositions. The color balance of the various compositions thus obtained was evaluated as follows.

[0101] (4) Evaluation method for color balance First Agent-50 (O / W emulsion) and Second Agent-1 (O / W emulsion) were mixed at a 1:1 (mass ratio), and then applied to a 10 cm, 1 g white hair tress (manufactured by Beaulux) at a bath ratio of 1:1 and left at 35°C for 30 minutes. The tress was then rinsed with water and an appropriate amount of a 10% aqueous solution of triethanolamine lauryl sulfate, and then allowed to air dry. The hair tress dyed by this process was dyed dark purple (7.5P 2.5 / 4.5) (JIS color name book). Using this hair bundle as a standard, the deviation (difference) in hue from the standard was visually observed by expert panelists (10 people), evaluated according to the following criteria, and an average score was calculated.

[0102] (Evaluation criteria for color balance) 1 point: There is a clear hue difference 2 points: There is a slight hue difference 3 points: Almost no hue deviation (Average score criteria) ◎: 2.5 points or more, 3.0 points or less ○: 2.0 points or more, less than 2.5 points △: 1.5 points or more, less than 2.0 points ×: Less than 1.5 points

[0103] These results are shown in Tables 13 and 14.

[0104] [Table 13]

[0105] [Table 14]

[0106] These results show that when the first agent is an O / W emulsion and the second agent is a W / O emulsion, the color balance is improved.

Claims

1. The cleaning agent is composed of a first agent containing ammonia and / or its salts as an alkaline agent and a second agent containing hydrogen peroxide as an oxidizing agent, the amount of ammonia and / or its salts blended is 0.1 to 3% by mass based on the total amount of the two-component oxidative hair dye or bleach composition; A two-component oxidative hair dye or bleach composition, wherein the amount of hydrogen peroxide blended is 0.5 to 6% by mass based on the total amount of the two-component oxidative hair dye or bleach composition, A two-component oxidative hair dye or bleach composition, wherein the first component is an oil-in-water (O / W) emulsion and the second component is a water-in-oil (W / O) emulsion.

2. A method for dyeing or bleaching hair using the two-component oxidative hair dye or bleach composition of claim 1.

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