Second-agent compositions for hair cosmetics, hair cosmetics and hair cosmetic kits

Abstract

This invention provides a second agent composition for hair cosmetics and a hair cosmetic product. The second agent composition constitutes the second agent of a hair cosmetic product having a first agent and a second agent. The second agent contains an oxidant and a polymeric compound (A) and is in an oil-water droplet emulsion state. This invention also provides a hair cosmetic product composed of a first agent and a second agent. The first agent contains an alkali agent, and the second agent is the second agent described in the second agent composition for hair cosmetics. Using this invention, the second agent composition for hair cosmetics has a different composition than conventional compositions, enabling the treatment of formulations containing oxidants in an oil-water droplet emulsion state, and achieving overall formulation stability while ensuring the stability of the oxidant.

Description

Technical Field

[0001] This first group of inventions relates to a second agent composition for hair cosmetics and a hair cosmetic. More specifically, it relates to a second agent composition for hair cosmetics in the form of an oil-water droplet emulsion, and a hair cosmetic using the composition.

[0002] This second group of inventions relates to hair cosmetics. More specifically, it relates to hair cosmetics that involve the mixing of two or more agents in different emulsion states, namely, oil droplets in water and water droplets in oil.

[0003] This third group of inventions relates to hair cosmetics and hair cosmetic sets. More specifically, it relates to hair cosmetics comprising a hair cosmetic composition in an oil-water droplet emulsion state, hair in an oil-water droplet emulsion state, hair on which a hair cosmetic composition in an oil-water droplet emulsion state is applied, and / or hair on which a mixture of a hair cosmetic composition in an oil-water droplet emulsion state and a hair cosmetic composition in an oil-water droplet emulsion state is applied, and hair cosmetic sets. Background Technology

[0004] Regarding this first group of inventions, in hair cosmetics containing oxidizing agents such as hair dyes and bleaching agents, the following patent documents 1 to 3 are known as techniques utilizing agents in an oil-water droplet emulsion state. Regarding this second group of inventions, as a hair cosmetic that uses two agents in different emulsified states—oil droplet type in water and water droplet type in oil—the following patent documents 1 to 3 are known. Regarding this third group of inventions, as a technique for utilizing a pharmaceutical agent in an oil-water droplet-like emulsion state, the following patent documents 1 to 3 are known.

[0005] Patent documents Patent Document 1: Japanese Patent Application Publication No. 09-002924 Patent Document 2: Japanese Patent Application Publication No. 10-067624 Patent document 3: Japanese Patent Application Publication No. 2019-167337.

[0006] Regarding this first invention, oxidants are important components in hair cosmetics such as hair dyes and bleaching agents. Due to their high reactivity, they can exert the expected performance in hair cosmetics. Therefore, in the components constituting hair cosmetics, components that destabilize oxidants are usually packaged separately from the oxidants. That is, this is the reason why hair cosmetics using oxidants are often made into multiple dosage forms. On the other hand, most oxidants used in hair cosmetics are water-soluble compounds, and therefore are treated in an aqueous system or in an oil-droplet (O / W) emulsion state in water. That is, whether treated in an aqueous system or in an emulsion state, the oxidant is directly contained in the external phase, so when manufacturing agents containing oxidants, there is a high chance of contact between the inner surface of the device and the oxidant. For example, if the oxidant comes into contact with metal in the flow path, it may sometimes cause the metal to oxidize. In this case, the oxidant will lose its function as an oxidant. That is, the oxidant will be consumed. Furthermore, even if the contact does not reach the level of oxidizing the metal, there is a concern that such contact may lead to instability of the oxidant. Furthermore, it is known that contact with rust caused by metal oxidation can also lead to the consumption or instability of the oxidant. Therefore, when manufacturing reagents containing oxidants, it is necessary to maintain the functionality of the added oxidant.

[0007] To prevent the consumption and destabilization of oxidants during the manufacturing process, methods such as reducing or eliminating metal exposure on the inner surfaces of the equipment can be considered. However, regardless of the method, the increased costs associated with handling oxidants are unavoidable. Therefore, as a method to reduce the chance of contact between the oxidant and the internal surface of the device, it is advisable to treat the oxidant-containing agent in an oil-in-water (W / O) emulsion state. In this case, the oil-based component can form the external phase of the agent, so the oxidant can be dispersed as an aqueous component within the oil-based component. This significantly reduces the chance of contact with the internal surface of the device, and it is believed that the stability of the oxidant in the formulation can be maintained to a high degree from manufacturing to packaging. However, in practice, if an attempt is made to treat the oxidant-containing agent in an oil-in-water emulsion state, there is a problem of reduced formulation stability.

[0008] Regarding this second group of inventions, the emulsification state of hair cosmetics can be selected from various perspectives during the design phase. For example, if a substance that provides a moisturizing sensation upon contact with the skin is preferred, an oil-droplet type (hereinafter also referred to as "O / W type") is easily chosen. On the other hand, if a substance that provides a rich, oily feel upon contact with the skin is preferred, an oil-water droplet type (hereinafter also referred to as "W / O type") is easily chosen. Furthermore, if the substance itself and the shine of the hair after dyeing are preferred, a W / O type is also easily chosen. In addition, as described in Patent Documents 1 to 3 above, from the viewpoints of inhibiting oxidation, protecting the container, inhibiting odor, and inhibiting skin irritation, a W / O type in which the oil phase can be used as the external phase is easily chosen. Thus, the emulsification state can be selected according to the priorities of the substance. For example, in hair cosmetics composed of multiple agents, such as hair dyes and bleaching agents, substances with different emulsification states can be used together.

[0009] Furthermore, in hair cosmetics that use agents in different emulsion states, it is sometimes necessary to control the properties of the mixture after mixing. That is, in hair dyes, bleaching agents, etc., the mixed agent is sometimes applied to the hair and left to stand for a specified time to ensure the agent's action time on the hair. In this case, it is preferable to achieve a suitable viscosity so that the applied mixture does not drip from the hair. However, when mixing O / W type agents with W / O type agents, the viscosity of the mixture tends to decrease, making it difficult to obtain a mixture with the desired viscosity. On the other hand, if an attempt is made to increase the viscosity of the resulting mixture, the problem of inmisivability sometimes becomes apparent, making it difficult to obtain a uniform mixture. That is, the formation of particles, such as one agent clumping or multiple agents clumping, is an inmisivability issue. Furthermore, in solving this problem, the impact of the hair cosmetic on the feel of the hair must also be considered.

[0010] In this regard, in order to solve the problems of oxidation and deterioration of the main agent due to contact with air (

[0005] ), discoloration and corrosion deformation of the container due to contact with the alkaline agent (

[0006] ), odor generated by the volatilization of the alkaline agent (

[0006] ), and difficulty in obtaining fragrance when the fragrance is contained in the oil phase (

[0007] ), a hair treatment agent (technical solution 1) is disclosed. The agent is characterized by comprising a W / O type emulsion first agent containing the main agent in the aqueous phase, and a second agent that is mixed with the first agent to convert the first agent into an O / W type emulsion or / and causes the emulsion destruction of the first agent.

[0011] In addition, in the aforementioned Patent Document 2, in order to solve the problems of difficulty in maintaining a moderate viscosity that does not drip from hair when using a large amount of surfactant to improve the stability of W / O type emulsion (

[0005] ), and the fact that W / O type emulsions often have insufficient hair dyeing power and are difficult to improve hair dyeing power (

[0005] ), an emulsion for hair treatment (Technical Solution 1) is disclosed. The emulsion is characterized by comprising a W / O type emulsion first agent containing a main agent in the aqueous phase and an oil-soluble polymer compound in the oil phase, and a second agent that is mixed with the first agent to convert the first agent into an O / W type emulsion or / and causes the emulsion destruction of the first agent.

[0012] Furthermore, in the aforementioned Patent Document 3, in order to obtain a two-component oxidative hair dyeing or bleaching agent composition that can fully dye or bleach hair and reduce skin irritation (

[0014] ), a two-component oxidative hair dyeing or bleaching agent composition (Technical Solution 1) is disclosed, which consists of a first agent containing an alkaline agent and a second agent containing an oxidizing agent. One of the first agent and the second agent is an oil droplet type (O / W) emulsion in water, and the other is an oil droplet type (W / O) emulsion in water.

[0013] However, regarding this first group of inventions, Patent Documents 1 and 2 do not describe or imply the focus or specific means of treating the oxidant-containing agent in an oil-in-water droplet emulsion state. Furthermore, Patent Document 3 discloses examples of preparing an oxidant-containing agent into an oil-in-water droplet emulsion (Second Agent-3, Second Agent-4, Second Agent-5, Second Agent-8, Second Agent-9, Second Agent-10 to Second Agent-33). However, these examples all utilize a large amount of surfactant to form an emulsion state, which, as described in Patent Document 2, suffers from drawbacks due to the large amount of surfactant used, such as depriving the freedom of viscosity adjustment and reducing the range of agent adjustment. Moreover, the large amount of surfactant used can actually reduce the stability of the formulation; therefore, a method is needed that can treat the agent in an oil-in-water droplet emulsion state with a different composition than that described in Patent Document 3.

[0014] This first invention was made in view of the above-mentioned problems, and its object is to provide a second agent composition for hair cosmetics and a hair cosmetic with a different composition than the past. This composition can treat the agent containing the oxidant in an oil-water droplet emulsion state, while ensuring the stability of the oxidant and obtaining the overall stability of the agent.

[0015] Furthermore, regarding this second group of inventions, neither Patent Documents 1 nor 3 described or implied any focus or method for viscosity control when mixing O / W type agents and W / O type agents. Moreover, while Patent Document 2 addresses suppressing dripping from hair as one of its issues, it states that "when a large amount of surfactant is used to improve emulsion stability, it is difficult to maintain a suitable viscosity that does not drip from hair when mixed with a second agent" (

[0004] ). It provides a solution in reducing the amount of surfactant incorporated, but not a solution in cases where surfactants are used. In this respect, surfactants are currently a naturally included component in compositions that must combine water-based and oil-based ingredients, but sometimes the stability of the formulation decreases if good miscibility is attempted through the addition of surfactants. Therefore, in hair cosmetics that combine O / W type agents and W / O type agents, there is a need for a hair cosmetic that can suppress dripping while achieving good miscibility and a pleasant feel on the hair after use.

[0016] This second invention was made in view of the above-mentioned problems, and its object is to provide a hair cosmetic that, in a hair cosmetic that uses both O / W type and W / O type agents, when the mixture obtained by mixing the first agent and the second agent is applied to the hair, can simultaneously prevent the mixture from dripping from the hair, while also ensuring good mixing properties (preventing clumping during mixing) and a pleasant feel to the hair after use.

[0017] Furthermore, regarding this third group of inventions, while agents in an oil-in-water droplet emulsion state can enjoy advantages that are difficult to obtain from agents in an oil-in-water droplet emulsion state, their rinsing performance becomes problematic when actually using agents in an oil-in-water droplet emulsion state. That is, after applying a multi-form hair cosmetic (which can be in an oil-in-water droplet or water-in-oil droplet form when used) containing a hair cosmetic composition in an oil-in-water droplet emulsion state, or a hair cosmetic in an oil-in-water droplet emulsion state, to the hair and then performing routine rinsing, a slippery or sticky feeling derived from the agent may sometimes remain. However, the aforementioned patent documents 1 to 3 do not describe or imply that rinsing is a problem or any countermeasures thereto.

[0018] This third invention was made in view of the above-mentioned problems, and its object is to provide a hair cosmetic composition and hair cosmetic kit that can improve the rinsing performance caused by the use of an agent in an oil-water droplet emulsion state. Summary of the Invention

[0019] This first group of inventions includes the following: [1] A second agent composition for hair cosmetics, comprising the second agent of a hair cosmetic having a first agent and a second agent, characterized in that the second agent contains an oxidant and (A) a polymeric compound, and is in an oil-water droplet emulsion state. [2] The second agent composition for hair cosmetics as described in [1] above, wherein the polymer compound (A) comprises an oil-soluble polymer compound (A-1) and a water-soluble polymer compound (A-2), [3] The second agent composition for hair cosmetics as described in [1] or [2] above, wherein the (A-1) oil-soluble polymer compound is contained as the (A) polymer compound, and when the total weight of the second agent composition for hair cosmetics is 100% by mass, the content of the (A-1) oil-soluble polymer compound is 0.1% to 2.0% by mass. [4] The second agent composition for hair cosmetics as described in any one of [1] to [3] above, wherein it contains (A-1) an oil-soluble polymer and (A-2) a water-soluble polymer as the aforementioned (A) polymer, The ratio of the oil-soluble polymer (A-1) to the water-soluble polymer (A-2) is 0.05 ≤ (A-1) / (A-2) ≤ 4. [5] The second agent composition for hair cosmetics as described in any one of [1] to [4] above, wherein it contains (B) an oily component, [6] The second agent composition for hair cosmetic as described in any one of [1] to [5] above, wherein it contains (B) an oily component, and the ratio of the content of the polymeric compound (A) to the content of the oily component (B) is 0.03 ≤ (A) / (B) ≤ 0.15. [7] A second agent composition for hair cosmetics as described in any one of [1] to [6] above, wherein it contains an oily component (B), wherein the oily component (B) comprises (B-1) silicone. [8] The second agent composition for hair cosmetic as described in any one of [1] to [7] above, wherein it is contained in a tubular packaging material, [9] A hair cosmetic comprising a first agent and a second agent, characterized in that the first agent contains an alkaline agent, and the second agent is the second agent described in any one of [1] to [8] above.

[10] As described in [9] above, the first agent is in an oil droplet emulsion state in water.

[11] Hair cosmetics as described in [9] or

[10] above are oxidative hair dyes or bleaching agents.

[0020] This second group of inventions includes the following: [1] A hair cosmetic product, wherein a first agent and a second agent are used in combination, characterized in that the first agent contains 1.5% by mass or more of (A1) surfactant when the total weight of the first agent is 100%, and is in an oil droplet emulsion state in water. The second agent mentioned above contains an oily component (B2) and exists in an oil-water droplet emulsion state. [2] As described in [1] above, the hair cosmetic product, wherein the above-mentioned (B2) oily component contains (B2-1) higher alcohol, [3] As described in [1] or [2] above, the hair cosmetic product, wherein the oily component (B2) comprises (B2-1) higher alcohol, and the (B2-1) higher alcohol comprises (B2-1-1) octyl-dodecyl alcohol and (B2-1-2) isostearyl alcohol, wherein the ratio of these contents is 0.2≦(B2-1-1) / (B2-1-2)≦5. [4] As described in any one of [1] to [3] above, wherein, when the second agent as a whole is 100% by mass, the content of the oily component (B2) is 18% to 30% by mass. [5] The hair cosmetic as described in any one of [1] to [4] above, wherein the oily component (B2) comprises (B2-2) silicone. [6] The hair cosmetic product as described in any one of [1] to [5] above, wherein the (A1) surfactant comprises two or more (A1-1) nonionic surfactants. [7] The hair cosmetic product as described in any one of [1] to [6] above, wherein the (A1) surfactant comprises two or more (A1-1) nonionic surfactants, and the (A1-1) nonionic surfactant comprises a (A1-1-1) nonionic surfactant with an HLB of less than 10 and a (A1-1-2) nonionic surfactant with an HLB of 10 or more. [8] The hair cosmetic product as described in any one of [1] to [7] above, wherein the (A1) surfactant comprises two or more (A1-1) nonionic surfactants, the (A1-1) nonionic surfactant comprises a (A1-1-1) nonionic surfactant with an HLB of less than 10 and a (A1-1-2) nonionic surfactant with an HLB of 10 or more, and the ratio of the content of the (A1-1-1) nonionic surfactant with an HLB of less than 10 to the content of the (A1-1-2) nonionic surfactant with an HLB of 10 or more is (A1-1-1) / (A1-1-2) ≤ 1. [9] The hair cosmetic product as described in any one of [1] to [8] above, wherein the (A1) surfactant comprises a polyoxyethylene alkyl ether.

[10] The hair cosmetic product as described in any one of [1] to [9] above, wherein the first agent contains an oily component (B1), and when the entire first agent is 100% by mass, the content of the oily component (B1) is 7% by mass or more.

[11] The hair cosmetic product as described in any one of [1] to

[10] above, wherein the first agent and the second agent are mixed on a tray for use.

[12] The hair cosmetic as described in any one of [1] to

[11] above is an oxidative hair dye or a bleaching agent.

[0021] This third group of inventions includes the following: [1] A hair cosmetic product, comprising a plurality of independent hair cosmetic compositions in a multi-dosage formulation, characterized in that at least one of the hair cosmetic compositions is in an oil-water droplet emulsion state and contains (A) a nonionic surfactant. [2] A hair cosmetic product, which is in an oil-water droplet emulsion state, characterized in that it contains (A) a nonionic surfactant. [3] A hair cosmetic product for use on hair to which a hair cosmetic composition in an oil-in-water droplet emulsion state has been applied, and / or on hair to which a mixture of a hair cosmetic composition in an oil-in-water droplet emulsion state and a hair cosmetic composition in an oil-in-water droplet emulsion state has been applied, characterized in that it contains (A) a nonionic surfactant. [4] The hair cosmetic product as described in any one of [1] to [3] above, wherein the nonionic surfactant in (A) is a nonionic surfactant other than polyoxyethylene alkyl ethers. [5] The hair cosmetic product as described in [1] or [2] above, wherein the content of the nonionic surfactant (A) above is 0.025% to 5% by mass when used. [6] Hair cosmetics as described in [3] above are shampoos, conditioners, hair masks, hair treatments, or cleansers. [7] As described in [3] above, the hair cosmetic product, when the total weight of the hair cosmetic product is 100%, contains 0.1% to 10% by weight of the nonionic surfactant. [8] The hair cosmetic as described in [1] above, wherein at least one of the hair cosmetic compositions contains (B) ester oil. [9] Hair cosmetics as described in [1] or [2] above, which are applied using a comb,

[10] A hair cosmetic kit comprising: a multi-dosage hair cosmetic composed of a plurality of independent hair cosmetic compositions, and the hair cosmetic described above [3], characterized in that at least one of the hair cosmetic compositions is in an oil-water droplet emulsion state.

[0022] The second agent composition for hair cosmetics according to the present invention can achieve overall stability of the pharmaceutical preparation while ensuring the stability of the oxidant.

[0023] According to the second invention, when applying a hair cosmetic obtained by mixing O / W type agents and W / O type agents to hair, the hair cosmetic can suppress dripping from the hair while ensuring good mixability (suppressing clumping during mixing) and a pleasant feel of the hair after use.

[0024] The hair cosmetic product according to this third invention can improve rinsing performance caused by the use of an agent in an oil-water droplet emulsion state. The hair cosmetic kit according to this third invention can improve rinsing performance caused by the use of an agent in an oil-water droplet emulsion state. Attached Figure Description

[0025] Figure 1 An explanatory diagram illustrating an example of a comb. Detailed Implementation

[0026] The following describes in detail the first group of inventions, the second group of inventions, and the third group of inventions. In addition, unless otherwise explicitly stated, "%" means "percentage of mass", "parts" means "parts of mass", and "X to Y" means "above X and below Y". In addition, some compound names are based on the ingredient list of the Japan Cosmetic Industries Association or on the INCI (International Nomenclature of Cosmetic Ingredients) list. Furthermore, in some compound names, the polyoxyethylene chain is sometimes abbreviated as "POE" and the polyoxypropylene chain as "POP". Additionally, the numbers in parentheses following these abbreviations indicate the molar number of additions. Furthermore, (meth)acrylic acid represents acrylic acid or methacrylic acid.

[0027] [1] Regarding the first group of inventions [1] Second agent composition for hair cosmetics The second agent composition for hair cosmetics of this first group of invention (hereinafter also referred to as "second agent") is a second agent constituting a hair cosmetic having at least a first agent and a second agent. Furthermore, the second agent is characterized in that it contains an oxidant and (A) a polymeric compound, and is in an oil-water droplet emulsion state.

[0028] Oil-to-water (W / O) emulsification is an emulsion state in which the oil-based components form a continuous phase and the aqueous components are dispersed within this continuous phase. In other words, it can be described as an emulsion state in which the oil-based components form the external phase and the aqueous components form the internal phase. Furthermore, the W / O emulsion state can be determined by any method. For example, if a pharmaceutical agent is dropped into water and stirred (lightly), and the agent does not diffuse into the water and maintains its original form, then the agent can be determined to be in a W / O emulsion state.

[0029] In contrast, oil-drop emulsification in water (hereinafter also referred to as "O / W type") is an emulsification state in which the aqueous components form a continuous phase and the oil components are dispersed within this continuous phase. That is, it can be described as an emulsification state in which the aqueous components form the external phase and the oil components form the internal phase. Furthermore, the O / W type emulsification state can be determined by any method. For example, if a drug is dropped into water and stirred (lightly), and the drug diffuses into the water, then the drug can be determined to be in an O / W type emulsion state.

[0030] <1>Oxidizing agent An oxidizing agent is a component that exerts an oxidizing effect, which is usually achieved by mixing with other compositions (other agents) different from the second agent. That is, for example, in the case where a first agent composition for hair cosmetics (hereinafter also referred to as "first agent") is included as an other agent, and the hair cosmetic is a two-agent hair cosmetic consisting of the first agent and the second agent, it is preferable that the oxidizing agent is included in the second agent but not in the first agent. Furthermore, the oxidizing effect of the oxidizing agent is achieved by mixing these first agents with the second agent.

[0031] Oxidizing agents are not limited in type as long as they can perform oxidative action; for example, peroxide-based oxidizing agents can be listed. Peroxide-based oxidizing agents are compounds having the structure shown as "-OO-". This structure is contained as a peroxide ion (O2²⁻) in inorganic compounds and as a peroxide structure (-OO-) or a percarboxylic acid structure (-CO-OO-) in organic compounds. These can be used alone or in combination of two or more. Among these, inorganic compounds are preferred, and more preferably hydrogen peroxide among the inorganic compounds described later.

[0032] Among the above, inorganic compounds in peroxide-based oxidants include: peroxides such as hydrogen peroxide (which can also be used as inclusion compounds or adducts of hydrogen peroxide, such as urea peroxide, melamine peroxide, hydrogen peroxide adducts of phosphates, hydrogen peroxide adducts of pyrophosphates, etc.); peroxide salts (alkali metal salts such as potassium and sodium salts, alkaline earth metal salts such as magnesium, calcium, strontium, barium, and zinc salts); percarbonates (alkali metal salts such as potassium and sodium salts); perborates (alkali metal salts such as potassium and sodium salts); permanganates (alkali metal salts such as potassium and sodium salts, alkaline earth metal salts such as magnesium, calcium, strontium, and barium salts), etc. These can be used individually or in combination with two or more.

[0033] In addition, organic compounds in peroxide-based oxidants include percarboxylic acids such as performic acid, peracetic acid, and perbenzoic acid, as well as their salts. Salts of percarboxylic acids include alkali metal salts such as potassium and sodium salts. These can be used alone or in combination of two or more. Furthermore, non-peroxide oxidants (i.e., compounds that do not have the structure shown by "-OO-") can be listed as: bromates (alkali metal salts such as potassium salts and sodium salts), etc. These can be used alone or in combination of two or more.

[0034] Based on 100% by mass of the second agent as a baseline, the content of the oxidant is not limited, but its lower limit can be set to 0.1% by mass, then to 2% by mass, and then to 3% by mass. On the other hand, its upper limit can be set to 30% by mass, then to 20% by mass, and then to 15% by mass. The above upper and lower limits can be combined. That is, for example, it can be set to 0.1% to 30% by mass, then to 2% to 20% by mass, and then to 3% to 15% by mass.

[0035] Furthermore, the second agent can be used directly at this concentration, or it can be mixed with the first agent as described above. That is, the second agent can be used as a mixture with the first agent. When used as a mixture, the proportion of oxidant in the mixture is not limited. That is, the proportion of oxidant is not limited when used, and when the total mass percentage of the mixture is 100%, its lower limit can be set to 0.05% by mass, further to 1% by mass, and further to 2% by mass. On the other hand, its upper limit can be set to 15% by mass, further to 10% by mass, and further to 7.5% by mass. The above upper and lower limits can be combined separately. That is, for example, it can be set to 0.05 to 15% by mass, further to 1 to 10% by mass, and further to 2 to 7.5% by mass.

[0036] <2> (A) Polymer compounds The polymer (A) is a high molecular weight compound. The presence of polymer (A) can improve the formulation stability of a drug (second agent) containing an oxidant in a W / O emulsion state. The structure of polymer (A) is not limited, and it is typically an organic compound with a carbon skeleton (i.e., polymer (A) typically does not contain silicone (C)). Furthermore, its molecular weight is not limited, and it is typically above 10,000.

[0037] Furthermore, from the viewpoint that the second agent is of the W / O type, the polymer compound (A) can be broadly classified into oil-soluble polymer compounds (A-1) and water-soluble polymer compounds (A-2), and the second agent preferably includes at least one of these. That is, the polymer compound (A) preferably includes an oil-soluble polymer compound (A-1) and / or a water-soluble polymer compound (A-2). In addition, the polymer compound (A) will be referred to as "compound (A)" below, the oil-soluble polymer compound (A-1) will be referred to as "compound (A-1)", and the water-soluble polymer compound (A-2) will be referred to as "compound (A-2)".

[0038] <2-1> (A-1) Oil-soluble polymers Among the above, the oil-soluble polymer (A-1) is a polymer dissolved in the oil phase (i.e., dissolved in the main component of the oil phase) of a W / O type emulsion. Examples of oil-soluble polymers (A-1) include: cellulose derivatives (oil-soluble cellulose derivatives), starch derivatives (oil-soluble starch derivatives), fatty acid polyesters (oil-soluble fatty acid polyesters), ethylene polymers (oil-soluble ethylene polymers), and acrylic polymers (oil-soluble acrylic polymers). These can be used individually or in combination of two or more. Furthermore, these are preferably nonionic polymers (nonionic oil-soluble polymers).

[0039] Among the aforementioned, examples of cellulose derivatives include cellulose ethers (oil-soluble cellulose ethers), cellulose esters (oil-soluble cellulose esters), etc. These can be used alone or in combination of two or more. Furthermore, as mentioned above, these are preferably non-ionic. That is, for example, non-ionic cellulose ethers are preferred. Examples of cellulose ethers include methylcellulose, ethylcellulose, and ethylmethylcellulose. These can be used alone or in combination of two or more. Among the aforementioned starch derivatives, examples include starch fatty acid esters and dextrin fatty acid esters. More specifically, examples include palmitic dextrin and ethylhexanoic acid dextrin. These can be used alone or in combination of two or more. Among the aforementioned fatty acid polyesters, examples include: (behenic acid / eicosanoic acid) glycerides, behenic acid glycerides, and eicosanoic acid glycerides. These can be used alone or in combination of two or more. From the perspective of improving the stability of the formulation due to its good solubility in the oil phase, ethyl cellulose is particularly preferred in the second agent.

[0040] <2-2> (A-2) Water-soluble polymers Of the above, the water-soluble polymer (A-2) is a polymer dissolved in the aqueous phase (i.e., dissolved in water) of the second agent in a W / O emulsion. Examples of water-soluble polymers (A-2) include: cellulose derivatives (water-soluble cellulose derivatives), ethylene polymers (water-soluble ethylene polymers), acrylic polymers (water-soluble acrylic polymers), glucose derivatives (cyclodextrin, starch), etc. These can be used individually or in combination of two or more. Furthermore, these water-soluble polymers are preferably ionic, and particularly preferably cationic.

[0041] Among the aforementioned, cellulose derivatives include: cellulose ethers (water-soluble cellulose ethers), cellulose esters (water-soluble cellulose esters), etc. These can be used alone or in combination of two or more. Examples of cellulose ethers include: carboxymethyl cellulose, carboxyethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methyl cellulose. These can be used alone or in combination of two or more. The aforementioned cellulose ether is preferably an ionic cellulose ether. The ionic cellulose ether can be any one of cationic cellulose ether, anionic cellulose ether, amphoteric cellulose ether, or nonionic cellulose ether. These can be used alone or in combination with two or more, but from the viewpoint of achieving a good feel (the feel of the hair after applying the hair cosmetic), a cationic cellulose ether (cationic water-soluble cellulose ether) is particularly preferred in the second agent. Examples of cationic cellulose ethers include: O-[2-hydroxy-3-(trimethylammonium)propyl]hydroxyethyl cellulose chloride (polyquaternium salt-10), dimethyldiallylammonium hydroxyethyl cellulose chloride, etc. Among these, O-[2-hydroxy-3-(trimethylammonium)propyl]hydroxyethyl cellulose chloride is preferred.

[0042] In addition, examples of water-soluble polymers containing polysaccharides other than cellulose and possessing cationic properties include dextran hydroxypropyltrimethylammonium chloride, etc. Furthermore, examples of acrylic polymers mentioned above include polyquaternium-11 (vinylpyrrolidone·N,N-dimethylaminoethyl methacrylate copolymer sulfate solution), etc. These can be used individually or in combination of two or more.

[0043] <2-3> Incorporation of polymer (A) Based on 100% by mass of the second dose as a baseline, the content of polymeric compound (A) is not limited. From the viewpoint of formulation stability, its lower limit can be set to 0.01% by mass, then to 0.5% by mass, then to 0.7% by mass, then to 0.9% by mass, and then to 1.3% by mass. On the other hand, from the viewpoint of formulation stability, its upper limit can be set to 15% by mass, then to 7% by mass, then to 4.5% by mass, then to 2.5% by mass, and then to 1.8% by mass. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 15% by mass, then to 0.5 to 7% by mass, then to 0.7 to 4.5% by mass, then to 0.9 to 2.5% by mass, and then to 1.3 to 1.8% by mass.

[0044] <2-4> Incorporation of oxidizing agent and polymer (A) Based on 100% by mass of the second agent, the ratio of oxidant to polymer (A) (oxidant / polymer) is not limited. From the viewpoint of hair dyeing power, its lower limit can be set to 0.5, then to 1, then to 2, and then to 4. On the other hand, from the viewpoint of rust prevention, its upper limit can be set to 40, then to 30, then to 20, and then to 15. The above upper and lower limits can be combined. That is, for example, it can be set to 0.5 to 40, then to 1 to 30, then to 2 to 20, and then to 4 to 15.

[0045] <2-5> Incorporation of oil-soluble polymer (A-1) When the second formulation contains an oil-soluble polymer (A-1), the proportion of the oil-soluble polymer (A-1) is not limited based on 100% by mass of the entire second formulation. From the viewpoint of formulation stability, its lower limit can be set to 0.01% by mass, further to 0.1% by mass, further to 0.2% by mass, further to 0.3% by mass, and further to 0.4% by mass. On the other hand, from the viewpoint of formulation stability, its upper limit can be set to 10% by mass, further to 5% by mass, further to 3.0% by mass, further to 2.0% by mass, and further to 1.2% by mass. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 10% by mass, further to 0.1 to 5% by mass, further to 0.2 to 3.0% by mass, further to 0.3 to 2.0% by mass, and further to 0.4 to 1.2% by mass.

[0046] <2-6> Incorporation of water-soluble polymer (A-2) When the second agent contains a water-soluble polymer (A-2), the proportion of the water-soluble polymer (A-2) is not limited based on 100% by mass of the entire second agent. From the viewpoint of formulation stability, its lower limit can be set to 0.1% by mass, then to 0.3% by mass, then to 0.5% by mass, then to 0.7% by mass, and then to 0.8% by mass. On the other hand, from the viewpoint of formulation stability, its upper limit can be set to 10% by mass, then to 4% by mass, then to 2.0% by mass, then to 1.6% by mass, and then to 1.4% by mass. The above upper and lower limits can be combined. That is, for example, it can be set to 0.1 to 10% by mass, then to 0.3 to 4% by mass, then to 0.5 to 2.0% by mass, then to 0.7 to 1.6% by mass, and then to 0.8 to 1.4% by mass.

[0047] <2-7> Combination of compound (A-1) and compound (A-2) When the second agent contains both an oil-soluble polymer (A-1) and a water-soluble polymer (A-2), the ratio of the proportions of each polymer (A-1) / (A-2) is not limited, based on 100% by mass of the second agent as a whole. From the viewpoint of formulation stability, its lower limit can be set to 0.01, then 0.1, then 0.2, then 0.3, then 0.4. On the other hand, from the viewpoint of formulation stability, its upper limit can be set to 5, then 3, then 1, then 0.8, then 0.65. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 5, then 0.1 to 3, then 0.2 to 1, then 0.3 to 0.8, then 0.4 to 0.65.

[0048] <3> (B) Oily components The second agent can be formulated with oily components. Incorporating oily components can improve the stability of the formulation, the feel (the texture of the hair after applying the hair cosmetic), and the spreadability. Oily components include: silicones, higher alcohols, hydrocarbons, oils, waxes, higher fatty acids, esters, etc. These can be used alone or in combination of two or more. Among these, higher alcohols and silicones are preferred oily components. Using these components can further improve the stability and feel of the formulation (the feel of the hair after applying hair cosmetics).

[0049] <3-1> Incorporation of oily component (B) When the second dose contains an oily component (B), the proportion of oily component (B) is not limited, based on 100% by mass of the entire second dose. From the viewpoint of formulation stability, its lower limit can be set at 18% by mass, further at 19% by mass, and further at 20% by mass. On the other hand, from the viewpoint of formulation stability, its upper limit can be set at 30% by mass, further at 28% by mass, and further at 26% by mass. The above upper and lower limits can be combined. That is, for example, it can be set at 18 to 30% by mass, further at 19 to 28% by mass, and further at 20 to 26% by mass.

[0050] <3-2> Combination of polymer (A) and oily component (B) When the second formulation contains an oily component (B), the ratio (A) / (B) of the proportion of polymeric compound (A) based on 100% mass of the second formulation as a whole to the proportion of oily component (B) based on 100% mass of the second formulation as a whole is not limited. From the viewpoint of formulation stability, its lower limit can be set to 0.01, and further to 0.02, 0.03, 0.04, or 0.05. On the other hand, from the viewpoint of formulation stability, its upper limit can be set to 0.30, and further to 0.20, 0.15, 0.10, or 0.08. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 0.30, and further to 0.02 to 0.20, and further to 0.03 to 0.15, and further to 0.04 to 0.10, and further to 0.05 to 0.08.

[0051] <3-3> Silicone (B-1) Among oily components, silicones (B-1) can be listed as follows: dimethyl polysiloxane (polydimethylsiloxane), methylphenyl polysiloxane, decamethylcyclopentasiloxane, dodecylcyclohexasiloxane, hydroxyl-terminated modified dimethyl polysiloxane, high-polymer silicones with an average degree of polymerization of 650 to 10000, amino-modified silicones (aminoethylaminopropylmethylsiloxane·dimethylsiloxane copolymer (aminoethylaminopropylpolydimethylsiloxane) etc.), polyether-modified silicones, betaine-modified silicones, alkyl-modified silicones, alkoxy-modified silicones, mercapto-modified silicones, carboxyl-modified silicones, fluorine-modified silicones, etc. These can be used alone or in combination of two or more. From the perspective of ensuring the stability of the second agent formulation while having a high degree of freedom in compounding from low to high dosage, and especially in imparting a smooth feel and good shine to the treated hair when compounding at high dosage, methylphenyl polysiloxane is preferred in the second agent.

[0052] When the oily component (B) contains silicone (B-1), the proportion of silicone (B-1) is not limited based on 100% by mass of the entire second agent. From the viewpoint of formulation stability, its lower limit can be set to 0.5% by mass, then to 1% by mass, then to 2% by mass, then to 3% by mass, and then to 4% by mass. On the other hand, from the viewpoint of formulation stability, its upper limit can be set to 10% by mass, then to 9% by mass, then to 8% by mass, then to 7% by mass, and then to 6% by mass. The above upper and lower limits can be combined. That is, for example, it can be set to 0.5 to 10% by mass, then to 1 to 9% by mass, then to 2 to 8% by mass, then to 3 to 7% by mass, and then to 4 to 6% by mass.

[0053] <3-4> Other oily components Among the oily components, higher alcohols can be alcohols with a carbon chain having 6 or more carbon atoms. For example, higher alcohols containing 8 to 40 carbon atoms. Furthermore, their skeletons can be saturated or unsaturated, and can be straight-chain or branched. Specific examples include: cetearyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol (hexadecyl alcohol), stearyl alcohol, arachidyl alcohol, behenyl alcohol, 2-hexyldecyl alcohol, isostearyl alcohol, 2-octyldodecyl alcohol, decyltetradecyl alcohol, oleyl alcohol, linoleyl alcohol, linolenic acid alcohol, lanolin alcohol, phytosterols, cholesterol, etc. These can be used alone or in combination of two or more. Among these, substances that are liquid at room temperature (especially 25°C) are preferred.

[0054] Among the oily components, hydrocarbons can be listed as follows: liquid paraffin (mineral oil), liquid isoparaffins, paraffin wax, olefin oligomers, polyisobutylene, hydrogenated polyisobutylene, synthetic squalane, squalene, squalane (hydrogenated squalene), polybutene, polyethylene (polyethylene wax), microcrystalline wax, petrolatum, ceresin, pure ceresin, limonene, turpentine, etc. These can be used individually or in combination of two or more. Among these, substances that are liquid at room temperature (especially 25°C) are preferred.

[0055] Oily components include, for example, vegetable oils (plant fats) and animal fats (animal fats). Vegetable oils include: camellia oil, rice bran oil, rice germ oil, macadamia seed oil, meadowfoam seed oil, jojoba seed oil, rice germ oil, sunflower seed oil, olive oil, grapeseed oil, almond oil, apricot kernel oil, peach kernel oil, peach oil, shea butter, rosehip oil, tea seed oil, camellia flower oil, argan oil, safflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, cocoa butter, corn oil, peanut oil, rapeseed oil, evening primrose oil, wheat germ oil, coix seed oil, avocado oil, carrot oil, castor oil, flaxseed oil, coconut oil, palm oil, etc. Animal fats include: beef tallow, lard, mink oil, egg yolk oil, etc. These can be used alone or in combination of two or more. Among them, substances that are liquid at room temperature (especially 25°C) are preferred.

[0056] Among oily components, waxes include: beeswax, candelilla wax, carnauba wax, jojoba oil, lanolin, whale wax, rice bran wax, sugarcane wax, palm wax, montan wax, cotton wax, myrica wax, insect wax, kapok wax, shellac wax, etc. These can be used alone or in combination of two or more. Among these, substances that are liquid at room temperature (especially 25°C) are preferred.

[0057] Among the oily components, higher fatty acids include: lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, hydroxystearic acid, 12-hydroxystearic acid, oleic acid, undecenoic acid, linoleic acid, ricinoleic acid, lanolin fatty acids, etc. These can be used alone or in combination of two or more. Among these, substances that are liquid at room temperature (especially 25°C) are preferred.

[0058] Among oily components, esters include: diisopropyl adipate, diisobutyl adipate, dioctyl adipate, 2-hexyldecyl adipate, diisostearyl adipate, isopropyl myristate, cetyl octanoate, cetyl isooctanoate, isononyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, diisopropyl sebacate, octyl dodecyl myristate, isopropyl palmitate, ethylhexyl palmitate, butyl stearate, stearyl stearate, hexyl laurate, myristyl myristate, and decyl oleate. Esters, hexyl decyl dimethyl octanoate, triisodecyl myristate, isostearyl myristate, PPG-3 benzyl ether myristate, 2-ethylhexyl palmitate, octyl dodecyl castor oil, fatty acid (C10-30) (cholesterol / lanosterol) esters, lauryl lactate, cetyl lactate, myristyl lactate, octyl dodecyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cetyl decanoate, diisostearyl malate, lanolin derivatives, etc. These can be used alone or in combination of two or more. Among these, substances that are liquid at room temperature (especially 25°C) are preferred.

[0059] <4> (C) Nonionic surfactants The second agent is preferably substantially surfactant-free. That is, when the entire second agent composition is 100% by mass, the surfactant content is preferably 1.5% by mass or less (furthermore, 1.0% by mass or less, further 0.5% by mass or less, further 0.1% by mass or less) or surfactant-free. This is because there are concerns that the presence of surfactants may lead to reduced formulation stability. On the other hand, for example, when imparting the function of easily removing post-use hair cosmetics from hair shampoo, a nonionic surfactant may be incorporated into the second agent.

[0060] Examples of nonionic surfactants (C) include ester-type nonionic surfactants, ether-type nonionic surfactants, and alkyl glycosides. These can be used alone or in combination of two or more. From the viewpoint of improving the cleansing power when washing away hair cosmetics adhering to hair, ester-type nonionic surfactants are preferred.

[0061] Examples of ester-type nonionic surfactants include: POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan monopalmitate, POE sorbitan monolaurate, POE sorbitan trioleate, and other POE sorbitan fatty acid esters; POE glyceryl monostearate, POE glyceryl monomyristate, and other glyceryl monofatty acid esters; and POE sorbitol tetraoleate, POE sorbitol hexastearate, POE sorbitol monolaurate, and other POE sorbitol fatty acid esters. The POE addition molar number of POE sorbitan fatty acid esters and monoglyceryl monofatty acid esters is, for example, 5 or more. The POE addition molar number of POE sorbitol fatty acid esters is, for example, 6 or more. In addition, other ester-type nonionic surfactants include: POE (6) POE sorbitol beeswax, etc., sorbitol beeswax, polyethylene glycol monooleate, polyethylene glycol monostearate, polyethylene glycol monolaurate, lipophilic glyceryl monooleate, lipophilic glyceryl monostearate, self-emulsifying glyceryl monostearate, sorbitan monooleate, sesquioleic sorbitan, trioleic sorbitan, sorbitan monostearate, sorbitan monopalmitate, sorbitan monolaurate, sucrose fatty acid esters, decaglyceryl monolaurate, decaglyceryl monostearate, decaglyceryl monooleate, decaglyceryl monomyristate, POE reduced lanolin, etc. These can be used alone or in combination with two or more. From the viewpoint of easy rinsing of the second agent, POE sorbitan fatty acid ester is preferred, and from the viewpoint of easy rinsing, POE sorbitan monooleate is more preferred.

[0062] Ether-type nonionic surfactants include: POE(5.5) cetyl ether, POE(6) cetyl ether, POE(6) cetyl ether, POE(7) cetyl ether, POE(10) cetyl ether, POE(15) cetyl ether, POE(20) cetyl ether, POE(23) cetyl ether, POE(25) cetyl ether, POE(30) cetyl ether, POE(40) cetyl ether, POE(2) cetyl ether, POE(4) cetyl ether, POE(5) cetyl ether, etc. POE cetyl ether (cetyl alcohol polyether); POE(20) stearyl ether POE(150) stearyl ether, POE(4) stearyl ether, POE(5) stearyl ether, POE(2) stearyl ether, etc. POE stearyl ether (stearyl alcohol polyether); POE(10) behenyl ether, POE(20) behenyl ether, POE(30) behenyl ether, POE(150) behenyl ether, POE(2) behenyl ether, POE(3) behenyl ether, POE(5) behenyl ether, POE(6) behenyl ether, etc. POE behenyl ether (behenyl alcohol polyether); POE(7) oil ether, POE(10) oil ether, POE(15) oil ether, POE (20) Oil ether, POE (50) oil ether, POE (2) oil ether, POE (3) oil ether, etc. POE oil ether (oil alcohol polyether); POE (4.2) lauryl ether, POE (9) lauryl ether, POE (10) lauryl ether, POE (21) lauryl ether, POE (25) lauryl ether, POE (2) lauryl ether, POE (3) lauryl ether, etc. POE lauryl ether (lauryl alcohol polyether); POE (2) myristyl ether, POE (3) myristyl ether, etc. POE myristyl ether; POE (2) octyl dodecyl ether, POE (5) octyl dodecyl POE octyl dodecyl ether, etc.; POE (2) hexyl decyl ether, POE (4) hexyl decyl ether, etc.; POE (5) isostearyl ether, etc.; POE nonyl phenyl ether; POE octyl phenyl ether; POE (10) POP (4) cetyl ether, POE (20) POP (4) cetyl ether, POE (20) POP (8) cetyl ether, POE (1) POP (4) cetyl ether, etc.; POE (12) POP (6) decyl tetradecyl ether, etc. These can be used alone or in combination with two or more.

[0063] When the second agent contains a nonionic surfactant (C), the proportion of nonionic surfactant (C) is not limited based on 100% by mass of the entire second agent. From the viewpoint of formulation stability, its lower limit can be set to 0.01% by mass, further to 0.10% by mass, and further to 0.15% by mass. On the other hand, from the viewpoint of formulation stability, its upper limit can be set to 1.5% by mass, further to 1.0% by mass, and further to 0.5% by mass. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 1.5% by mass, further to 0.10 to 1.0% by mass, and further to 0.15 to 0.5% by mass.

[0064] <5> (D) Stabilizer The second agent can be a stabilizer (D). Adding a stabilizer can improve the stability of the oxidant. Examples of stabilizers (D) include: phenoxyethanol (ethylene glycol phenyl ether), salicylic acid, salicylates, hydroxyethylphosphonic acid, hydroxyethylphosphonate, stannic acid, stannate, etc. The cations constituting the salt can include: alkali metal ions, ammonium ions, etc. These can be used alone or in combination of two or more. In the second agent, from the viewpoint of reducing the impact on the stability of the formulation, phenoxyethanol and / or salicylic acid are preferred among the stabilizers (D) mentioned above.

[0065] <6> Other ingredients In addition to the aforementioned (A) polymeric compounds, (B) oily components, (C) nonionic surfactants, and (D) stabilizers, the second agent may also contain other ingredients. These other ingredients include: pH adjusters, preservatives, antioxidants, dispersants, protein derivatives and amino acids, chelating agents, plant extracts, herbal extracts, vitamins, pigments, fragrances, and ultraviolet absorbers. These can be used individually or in combination of two or more.

[0066] <7> Dosage form, properties and packaging materials Furthermore, the dosage form of the second agent (the dosage form at 25°C) is not limited, and can be, for example, cream, paste, liquid, gel, foam, etc. Its properties are not limited, nor is its specific viscosity; for example, it can be from 1 to 300,000 mPa·s. In particular, the second agent can be adjusted to a viscous liquid state, that is, for example, from 500 to 300,000 mPa·s. The lower limit of this viscosity can be set to 500 mPa·s, 1,000 mPa·s, or 5,000 mPa·s. On the other hand, the upper limit of the viscosity can be set to 250,000 mPa·s, 225,000 mPa·s, or 200,000 mPa·s. The above upper and lower limits can be combined separately. That is, for example, it can be set to 500 to 250,000 mPa·s, 1,000 to 225,000 mPa·s, or 5,000 to 200,000 mPa·s. Furthermore, the above viscosity values ​​are measured using a Type B viscometer at 25°C.

[0067] The packaging material for containing the second dose is not limited and can be a tubular packaging material, a pump packaging material, a bottle packaging material, a two-can packaging material, an applicator, a pouch, etc. From the viewpoint of improving operability, tubular packaging materials are preferred; furthermore, from the viewpoint of formulation stability, tubular packaging materials with an aluminum inner surface (including products containing an inner bag inside the tube) are more preferred. When using tubular packaging materials, their shape is not limited; for example, the diameter is preferably 20 to 35 mm (Φ), more preferably 25 to 30 mm. Furthermore, the length is preferably 120 to 175 mm, more preferably 130 to 150 mm. Moreover, the opening diameter is preferably 5 to 10 mm (Φ), more preferably 7.5 to 9 mm.

[0068] [2] Hair cosmetics The hair cosmetic of this first invention is a hair cosmetic comprising a first agent and a second agent, characterized in that the first agent contains an alkaline agent, and the second agent is the aforementioned second agent (i.e., the second agent contains an oxidizing agent and a polymeric compound (A), in a W / O type emulsion state). Hair cosmetics only require that the first agent contains an alkaline agent and the second agent is one of the aforementioned agents containing an oxidizing agent. Examples of such hair cosmetics include: oxidative hair dyes, bleaching agents, dye removal agents, and color-removing and dye-removing agents.

[0069] <1> Regarding the first dose As described above, the second agent is a composition in a W / O emulsion state, while the emulsion state of the first agent is not limited and can be either W / O or O / W, preferably O / W. That is, an emulsion state in which the aqueous components form a continuous phase and the oil components are dispersed within that continuous phase is preferred. When the first agent is O / W, mixing the first and second agents can disrupt the W / O emulsion state of the second agent, making the resulting mixture entirely O / W. This improves the washability of hair cosmetics applied to hair during rinsing. In addition, as mentioned above, the emulsification state can be determined by any method. For example, for O / W type, it can be determined by dropping the agent into water and stirring (light stirring) to allow the agent to diffuse into the water.

[0070] <2> Alkaline agents Alkaline agents are components that exhibit alkalinity in their water-soluble state. By coexisting with oxidizing agents, these agents can decompose or alter colored components such as melanin and dyes, thereby achieving visible color fading or decolorization. That is, regardless of whether the hair is dyed, hair decolorization can be achieved by decomposing or altering the melanin contained in the hair, and dye decolorization can be achieved by decomposing or altering the dye on the dyed hair. Furthermore, alkaline agents themselves have a swelling effect on hair, or a hair swelling-promoting effect that enhances this effect. Therefore, they are components that can promote the aforementioned effects within the hair.

[0071] Alkaline agents can be listed as: organic bases, inorganic bases and their salts. Organic bases include: organic amines, basic amino acids (arginine, lysine and their salts, etc.), guanidines and their salts (guanidine carbonate, etc.). Specific examples include: monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, aminomethylpropanol (2-amino-2-methyl-1-propanol, etc.), aminomethylpropanediol (2-amino-2-methyl-1,3-propanediol, etc.), and other alkanolamines, monoethylamine, isopropylamine, and other alkylamines. These organic bases can be used alone or in combination with two or more.

[0072] Inorganic bases can be listed as follows: hydroxides, chlorides, silicates, carbonates, bicarbonates, metasilicates, phosphates, sulfates, ammonia, etc. Specific examples include: alkali metal hydroxides such as sodium hydroxide, alkali metal carbonates such as sodium carbonate, alkali metal bicarbonates such as sodium bicarbonate, alkaline earth metal hydroxides such as magnesium hydroxide and calcium hydroxide, alkaline earth metal carbonates such as magnesium carbonate and calcium carbonate, ammonium salts such as ammonium carbonate and ammonium bicarbonate, etc. These inorganic bases can be used alone or in combination of two or more.

[0073] The content of the alkaline agent in the first agent is not limited, as long as it is added to a hair cosmetic with a pH greater than 7, preferably greater than pH 8, and more preferably greater than pH 9. By adding it to a pH greater than 7, the decolorizing effect, hair swelling effect, and hair swelling promotion effect accompanying the addition of the alkaline agent can be effectively obtained. On the other hand, the upper limit of pH is not limited, and it is usually added to a pH of 13.5 or less, preferably less than pH 13, and more preferably less than pH 12. These upper and lower limits can be combined arbitrarily. For example, the pH can be greater than 7 and less than 13.5, further can be 8 to 13, and further can be 9 to 12. In addition, the pH of the hair cosmetic is the pH of the mixture of the first and second agents, and is the pH at 25°C.

[0074] The proportion of alkaline agent in the first agent is not limited. Based on 100% by mass of the first agent, its lower limit can be set to 0.1% by mass, 0.5% by mass, or 3% by mass. On the other hand, its upper limit can be set to 17% by mass, 15% by mass, or 10% by mass. Within these ranges, superior hair dyeing power can be obtained. The above upper and lower limits can be combined. That is, for example, they can be set to 0.1 to 17% by mass, 0.5 to 15% by mass, or 3 to 10% by mass.

[0075] <3> Other ingredients The first agent, in addition to alkaline agents, may also contain other ingredients. Other ingredients may include: dyes, solubilizers, oily components, water-soluble polymers, surfactants, preservatives, antioxidants, stabilizers, plant extracts, etc.

[0076] <3-1> Dyes Dyes are the components that contribute to hair coloring, and previously known dyes can be used. Specific examples include oxidative dyes and direct dyes. These can be used alone or in combination of two or more. In the above, the oxidative dye is composed of at least one of the dye intermediate and the coupling agent. The dye intermediate is the component that develops color through oxidative polymerization in the presence of an oxidant. On the other hand, the coupling agent is the component that develops color through oxidative polymerization together with the dye intermediate in the presence of an oxidant, which can achieve a color development that cannot be obtained by oxidative polymerization of the dye intermediate alone.

[0077] Examples of dye intermediates include: p-phenylenediamine, toluene-2,5-diamine (p-toluenediamine), 2,2'-[(4-aminophenyl)imino]diethanol, N-phenyl-p-phenylenediamine, 4,4'-diaminodiphenylamine, 2-hydroxyethyl-p-phenylenediamine, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, o-chloro-p-phenylenediamine, 4-amino-m-cresol, 2-amino-4-hydroxyethylaminoanisole, 2,4-diaminophenol, 1,2,4-trihydroxybenzene, o-aminophenol, p-aminophenol, p-methylaminophenol, etc. Furthermore, dye intermediates may include salts of the aforementioned compounds. Salts may include acid addition salts. Examples of acid addition salts include inorganic acid addition salts such as hydrochlorides and sulfates, and organic acid addition salts such as acetates. These dye intermediates and their salts may be used alone or in combination of two or more.

[0078] Examples of coupling agents include 2,4-diaminophenoxyethanol, α-naphthol, 2,6-diaminopyridine, 5-amino-o-cresol, 5-(2-hydroxyethylamino)-2-methylphenol, resorcinol, catechol, pyrogallol, gallic acid, hydroquinone, m-phenylenediamine, toluene-3,4-diamine, diphenylamine, 3,3'-iminodiphenylamine, 1,5-dihydroxynaphthalene, tannic acid, o-aminophenol, m-aminophenol, p-aminophenol, and p-methylaminophenol. Furthermore, coupling agents may include salts of the aforementioned compounds. Salts may include acid addition salts. Examples of acid addition salts include inorganic acid addition salts such as hydrochlorides and sulfates, and organic acid addition salts such as acetates. These coupling agents and their salts may be used alone or in combination of two or more.

[0079] Furthermore, of the compounds mentioned above, o-aminophenol, p-aminophenol, and p-methylaminophenol can be used as both dye intermediates and coupling agents. For example, when these compounds are used as dye intermediates, coupling agents other than those listed above can be used in conjunction. Similarly, when these compounds are used as coupling agents, dye intermediates other than those listed above can be used in conjunction.

[0080] Among the aforementioned examples, direct dyes include ionic direct dyes and nonionic direct dyes. These can be used individually or in combination of two or more. Ionic direct dyes include acid dyes and basic dyes. These can be used individually or in combination of two or more. Furthermore, nonionic direct dyes include HC dyes and disperse dyes. These can be used individually or in combination of two or more.

[0081] Acid dyes include: Red No. 2, Red No. 3, Red No. 102, Red No. 104, Red No. 105, Red No. 106, Red No. 201, Red No. 203, Red No. 220, Red No. 227, Red No. 230 (1), Red No. 504, Yellow No. 4, Yellow No. 5, Yellow No. 202 (1), Yellow No. 202 (2), Yellow No. 203, Yellow No. 205, Orange No. 207, Orange No. 402, Green No. 3, Green No. 204, Green No. 401, Blue No. 1, Blue No. 2, Blue No. 202, Blue No. 204, Blue No. 404, Purple No. 401, Brown No. 201, Black No. 401, etc. These can be used individually or in combination with two or more.

[0082] Basic dyes include: basic red, basic orange, basic yellow, basic green, basic blue, basic purple, and basic brown. These can be used alone or in combination of two or more. Furthermore, among the aforementioned, basic red dyes include: Basic Red 1, Basic Red 2, Basic Red 22, Basic Red 46, Basic Red 51, Basic Red 76, Basic Red 118, etc. Basic orange dyes include: Basic Orange 1, Basic Orange 2, Basic Orange 31, etc. Basic yellow dyes include: Basic Yellow 11, Basic Yellow 28, Basic Yellow 40, Basic Yellow 57, Basic Yellow 87, etc. Basic green dyes include: Basic Green 1, Basic Green 4, etc. Basic blue dyes include: Basic Blue 3, Basic Blue 6, Basic Blue 7, Basic Blue 9, Basic Blue 26, Basic Blue 41, Basic Blue 47, Basic Blue 75, Basic Blue 77, Basic Blue 99, Basic Blue 124, etc. Examples of basic violet dyes include: Basic Violet 1, Basic Violet 2, Basic Violet 3, Basic Violet 4, Basic Violet 14, Basic Violet 16, etc. Examples of basic brown dyes include: Basic Brown 4, Basic Brown 16, Basic Brown 17, etc. These can be used alone or in combination of two or more.

[0083] Examples of HC dyes include: HC red, HC orange, HC yellow, HC blue, and HC violet. These can be used alone or in combination of two or more. Furthermore, among the above, HC red dyes can be listed as follows: HC Red 1, HC Red 3, HC Red 7, HC Red 10, HC Red 11, HC Red 13, HC Red 14, HC Red 17, HC Red 18, HC Red 19, HC Red 20, HC Red 21, etc. HC orange dyes can be listed as follows: HC Orange 1, HC Orange 2, HC Orange 3, HC Orange 6, HC Orange 7, etc. HC yellow dyes can be listed as follows: HC Yellow 2, HC Yellow 4, HC Yellow 5, HC Yellow 7, HC Yellow 9, HC Yellow 11, HC Yellow 13, HC Yellow 16, HC Yellow 18, HC Yellow 6, HC Yellow 10, HC Yellow 12, HC Yellow 14, HC Yellow 15, HC Yellow 19, etc. Examples of HC blue dyes include: HC Blue 2, HC Blue 5, HC Blue 6, HC Blue 8, HC Blue 9, HC Blue 10, HC Blue 11, HC Blue 12, HC Blue 13, HC Blue 14, HC Blue 15, HC Blue 16, HC Blue 18, HC Blue 19, HC Blue 20, etc. Examples of HC violet dyes include: HC Violet 1, HC Violet 2, HC Violet 3, HC Violet 4, etc. These can be used individually or in combination of two or more.

[0084] Disperse dyes include: Disperse Black 9, Disperse Blue 1, Disperse Blue 3, Disperse Blue 7, Disperse Brown 4, Disperse Orange 3, Disperse Red 11, Disperse Red 15, Disperse Red 17, Disperse Violet 1, Disperse Violet 4, and Disperse Violet 15. These can be used alone or in combination of two or more.

[0085] In addition, there are nitro dyes such as 4-nitro-o-phenylenediamine, 2-nitro-p-phenylenediamine, 2-amino-4-nitrophenol, 2-amino-5-nitrophenol, picric acid and its salts, as well as carotenoid pigments, anthraquinone pigments, flavonoid pigments (anthocyanin pigments, chalcone pigments, flavonoid pigments), dophenine pigments, diketone pigments, betalain pigments, and azophenin pigments. Specific examples include: madder pigment, extracted carotene, cochineal pigment, shellac pigment, purple cabbage pigment, perilla pigment, purple corn pigment, elderberry pigment, boysenberry pigment, grape peel pigment, grape juice pigment, purple sweet potato pigment, safflower yellow pigment, safflower red pigment, sorghum pigment, onion pigment, cocoa pigment, sandalwood pigment, spirulina blue pigment, chlorophyll, beet red, red yeast rice pigment, indigo, gardenia pigment, curcumin yellow pigment, annatto orange pigment, sodium copper chlorophyll, pepper pigment, shellac pigment, henna, rutin, safflower, and other natural dyes. These can be used individually or in combination of two or more.

[0086] The proportion of dye is not limited, but based on 100% by mass of the first agent, the lower limit is preferably 0.001% by mass. By setting it to 0.001% by mass or more, effective hair dyeing and improved color tone can be achieved. Furthermore, the lower limit can be set to 0.1% by mass, and further to 0.5% by mass. On the other hand, the upper limit can be set to 15% by mass, 10% by mass, or 6% by mass. These upper and lower limits can be combined arbitrarily. For example, it can be set to 0.001 to 15% by mass, 0.1 to 10% by mass, or 0.5 to 6% by mass.

[0087] <3-2> Solubilizer A solubilizer is a component that helps to solubilize the various ingredients contained in the first agent. Examples of solubilizers include water and alcohols. These can be used alone or in combination of two or more. From the viewpoint of achieving excellent solubility, water is preferred. Furthermore, a combination of water and alcohols is more preferred.

[0088] Alcohols can be categorized as follows: monohydric alcohols (monolithic aliphatic alcohols, monoaromatic alcohols, etc.), polyhydric alcohols, and ether alcohols. These can be used individually or in combination of two or more.

[0089] Among monohydric alcohols, monoaliphatic alcohols are preferably those with 5 or fewer carbon atoms, such as ethanol, n-propanol, and isopropanol. These can be used alone or in combination of two or more. In addition, examples of monohydric alcohols, including monohydric aromatic alcohols, include: benzyl alcohol, 2-phenylethanol, cinnamyl alcohol, phenylpropanol, 1-phenoxy-2-propanol, phenylethylene glycol, α-methylbenzyl alcohol, dimethylbenzylethanol, benzyloxyethanol, phenoxyethanol, phenoxyisopropanol, and p-anestinol. These can be used alone or in combination of two or more. Furthermore, as a monohydric alcohol with an ether bond, an ether alcohol with a total of three or more hydroxyl groups and ether bonds is preferred, specifically including: ethoxydiethylene glycol (diethylene glycol monoethyl ether), methoxydiethylene glycol (diethylene glycol monomethyl ether), diethylene glycol monobutyl ether, etc.

[0090] Of the above, monohydric alcohols are preferably ether alcohols, and more preferably ether alcohols having a total of three or more hydroxyl groups and ether bonds, more preferably ethoxydiethylene glycol and / or methoxydiethylene glycol, and particularly preferably ethoxydiethylene glycol.

[0091] The valence of the polyol is not limited and can be 6 or higher, but from the viewpoint of improving the solubility or dispersibility of the dye component, a valence of 2 to 5 is preferred. Furthermore, the number of carbon atoms in the polyol is not limited; if it is a hydrocarbon group, it can have 6 or more carbon atoms, but from the viewpoint of improving the solubility or dispersibility of the dye component, a carbon number of 2 to 5 is preferred. Specific examples include: alkyl glycols such as ethylene glycol, propylene glycol, butanediol, and pentanediol; oxadiols such as diethanol and dipropanol; ethylene glycol; propylene glycol such as propane-1,2-diol and trimethylenediol; butylene glycol such as 1,2-butanediol, 1,3-butanediol, and 1,4-butanediol; pentanediols such as isopentylene glycol, 1,5-pentanediol, and 1,2-pentanediol; and alkyltriols such as glycerol, glyceryl glycerol (1,2,3-butanetriol, 1,2,4-butanetriol, etc.), and glycerol (1,2,3-pentanetriol, 1,2,5-pentanetriol, 2,3,4-pentanetriol, etc.). These can be used individually or in combination with two or more.

[0092] Furthermore, examples of polyols containing ether bonds include polyalkylene glycols. Examples of polyalkylene glycols include polyethylene glycol. The average molecular weight (number average molecular weight) of polyethylene glycol is not limited, but is typically 100 to 5000, preferably 100 to 2500, and more preferably 100 to 2000.

[0093] 〈3-3〉Oily ingredients The first preparation may include oily components. Examples of oily components include: higher alcohols, hydrocarbons, silicones, fats, waxes, higher fatty acids, esters, etc. These can be used alone or in combination of two or more. The types of oily components mentioned above are the same as those in the second preparation (B). In the first agent, among the above-mentioned oily components, preferred ingredients include higher alcohols (cetyl alcohol, stearyl alcohol, etc.), hydrocarbons (petroleum jelly, etc.), vegetable oils (camellia oil, rice bran oil, rice germ oil, etc.), and silicones (amino-modified silicones (aminoethylaminopropyl polydimethylsiloxane, etc.)).

[0094] When the first agent contains oily components, the proportion of oily components relative to 100% by mass of the total first agent is not particularly limited, but its lower limit can be set at 0.5% by mass, further at 1% by mass, even further at 4% by mass, and still further at 7% by mass. Furthermore, its upper limit can be set at 30% by mass, further at 20% by mass, even further at 17% by mass, and still further at 14% by mass. The above upper and lower limits can be combined arbitrarily. That is, for example, it can be set from 0.5% to 30% by mass, further at 1% to 20% by mass, even further at 4% to 17% by mass, and still further at 7% to 14% by mass.

[0095] <3-4> Water-soluble polymers Water-soluble polymers can be categorized into water-soluble natural polymers, water-soluble semi-synthetic polymers, water-soluble synthetic polymers, and water-soluble inorganic polymers. One type or more can be used. Water-soluble polymers can be used, for example, to adjust the viscosity of the first agent and subsequently, hair cosmetics.

[0096] Examples of natural, water-soluble polymers include guar gum, locust bean gum, guar gum, carrageenan, galactan, gum arabic, tragacanth, pectin, mannan, xanthan gum, dextran, succinyl dextran, gelatin, hyaluronic acid, gelatin, casein, albumin, collagen, and dextrin. One or more of these can be used together.

[0097] Examples of semi-synthetic water-soluble polymers include cellulose-based water-soluble polymers, cationic guar gum, starch phosphate, propylene glycol alginate, and alginate. One or more of these can be used together. In addition, examples of water-soluble cellulose-based polymers include methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxyethylcellulose dimethyl diallyl ammonium chloride, hydroxypropylcellulose, carboxymethylcellulose, sodium carboxymethylcellulose, hydroxypropyl methylcellulose, and cationic cellulose. Only one type of these can be used, or two or more can be used in combination.

[0098] Examples of synthetic water-soluble polymers include polyvinyl alcohol (PVA), polyvinyl butyral, polyvinyl methyl ether, carboxyvinyl polymers, sodium polyacrylate, polyacrylamide, polyethylene oxide, ethylene oxide-propylene oxide block copolymers, acrylic acid / alkyl acrylate copolymers, polydimethylmethylenepiperidinium chloride, polyethylene glycol, and high-polymerization-degree polyethylene glycol. Additionally, examples include half-esters of itaconic acid and POE alkyl ethers, esters of methacrylic acid and POE alkyl ethers, and copolymers composed of at least one monomer selected from acrylic acid, methacrylic acid, and their alkyl esters. These can be used individually or in combination of two or more.

[0099] When the first agent contains a water-soluble polymer, the proportion of the water-soluble polymer relative to 100% by mass of the total first agent is not particularly limited, but its lower limit can be set to 0.5% by mass, further to 1% by mass, even further to 3% by mass, and still further to 5% by mass. Furthermore, its upper limit can be set to 30% by mass, further to 20% by mass, even further to 15% by mass, and still further to 13% by mass. The above upper and lower limits can be arbitrarily combined. That is, for example, it can be set to 0.5% to 30% by mass, further to 1% to 20% by mass, even further to 3% to 15% by mass, and still further to 5% to 13% by mass.

[0100] <3-5> Surfactants As surfactants, examples include cationic surfactants, anionic surfactants, amphoteric surfactants, and nonionic surfactants. One type or more can be used. Surfactants are formulated, for example, to stably contain dyes, oily components, etc., in the first agent, and subsequently in hair cosmetics, etc. In the above, the types of nonionic surfactants are the same as those in the second agent.

[0101] As cationic surfactants, examples include alkyl quaternary ammonium salts such as monoalkyl, dialkyl, trialkyl, benzalkonium chloride, and monoalkyl ether quaternary ammonium salts; amine salts such as alkylamine salts, fatty acid amide amine salts, ester-containing tertiary amine salts, and Acobel-type tertiary amine salts; cyclic quaternary ammonium salts such as alkylpyridinium salts and alkyl isoquinolineium salts; and benzyl chloride, etc. Only one type of these can be used, or two or more can be used in combination.

[0102] Among these, alkyl quaternary ammonium salts are preferred, monoalkyl quaternary ammonium salts and / or dialkyl quaternary ammonium salts are more preferred, and monoalkyl quaternary ammonium salts are even more preferred.

[0103] Examples of monoalkyl quaternary ammonium salts include behenyltrimethylammonium chloride (behenyltrimethylammonium chloride), lauryltrimethylammonium chloride, lauryltrimethylammonium bromide, alkyl(16,18)trimethylammonium chloride, cetyltrimethylammonium chloride (cetrimethylammonium chloride), cetyltrimethylammonium bromide, cetyltrimethylammonium saccharin, stearyltrimethylammonium chloride (stearyltrimethylammonium chloride), stearyltrimethylammonium bromide, cetyltrimethylammonium saccharin, stearyltrimethylammonium saccharin, and distearate di-stearyltrimethylammonium chloride. Methylammonium chloride, alkyl(28)trimethylammonium chloride, diPOE(2)oleylmethylammonium chloride, diPOEstearylmethylammonium chloride, POE(1)POP(25)diethylmethylammonium chloride, POP methyldiethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, dicocoyldimethylammonium chloride, lanolin fatty acid aminopropylethyldimethylammonium ethyl sulfate, behenyltrimethylammonium methyl sulfate, hydroxyethylcellulose dimethyldiallylammonium chloride, etc. Only one of these can be used, or two or more can be used together.

[0104] Examples of anionic surfactants include alkyl ether sulfates, POE alkyl ether sulfates, alkyl sulfates, alkenyl ether sulfates, alkenyl sulfates, olefin sulfonates, alkane sulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, α-sulfonic acid fatty acid salts, N-acyl amino acid surfactants, phosphate monoesters or diesters, and sulfosuccinates. One or more of these can be used. Counterions for the anionic groups of these surfactants include sodium ions, potassium ions, and triethanolamine. One or more of these can also be used.

[0105] That is, for example, disodium lauryl sulfosuccinate, sodium lauryl sulfate, sodium myristyl sulfate, potassium lauryl sulfate, ammonium lauryl sulfate, triethanolamine lauryl sulfate, sodium cetyl sulfate, sodium stearyl sulfate, sodium POE lauryl ether sulfate, triethanolamine POE lauryl ether sulfate, ammonium POE lauryl ether sulfate, sodium POE stearyl ether sulfate, disodium lauryl sulfosuccinate, sodium stearoyl methyl taurate, triethanolamine dodecylbenzene sulfonate, sodium tetradecyl sulfonate, sodium lauryl phosphate, POE lauryl ether phosphate and its salts, N-lauroyl glutamate salts (sodium lauroyl glutamate, etc.), N-lauroyl methyl-β-alanine salts, N-acyl glycine salts, N-acyl glutamate salts, lauric acid as a higher fatty acid, myristic acid, and salts of these higher fatty acids. Only one of these can be used, or two or more can be used in combination.

[0106] As amphoteric surfactants, examples include amino acid-type amphoteric surfactants and betaine-type amphoteric surfactants. Among them, amino acid-type amphoteric surfactants include sodium lauroyl-N'-carboxymethyl-N'-hydroxyethyl ethylenediamine (sodium lauroyl amphoteric acetate), 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazoline betaine, undecylhydroxyethyl imidazoline betaine sodium, alkyl diaminoethyl glycine hydrochloride, sodium N-cocoa fatty acid acyl-N'-carboxyethyl-N'-hydroxyethyl ethylenediamine, disodium N-cocoa fatty acid acyl-N'-carboxyethoxyethyl-N'-carboxyethyl ethylenediamine, disodium N-cocoa fatty acid acyl-N'-carboxymethoxyethyl-N'-carboxymethyl ethylenediamine, sodium lauryl diaminoethyl glycinate, sodium palm oil fatty acid acyl-N-carboxyethyl-N-hydroxyethyl ethylenediamine, etc., which are glycine-type amphoteric surfactants; sodium lauryl aminopropionate, sodium lauryl aminodipropionate, triethanolamine lauryl aminopropionate, etc., which are aminopropionic acid-type amphoteric surfactants; etc. You can use just one of these, or you can use two or more together.

[0107] Examples of betaine-type amphoteric surfactants include cocoyl betaine, lauryl dimethylaminoacetic acid betaine, myristyl dimethylaminoacetic acid betaine, stearyl dimethylaminoacetic acid betaine, stearyl dimethyl betaine sodium, cocoyl fatty acid amamidopropyl betaine, palm oil fatty acid amamidopropyl betaine, lauryl amamidopropyl betaine, ricinoleic acid amamidopropyl betaine, stearyl dihydroxyethyl betaine, and other aminoacetic acid betaine-type amphoteric surfactants; and lauryl hydroxysulfonyl betaine and other sulfobetaine-type amphoteric surfactants. Only one type of these can be used, or two or more can be used in combination.

[0108] When the first agent contains a surfactant, the proportion of surfactant relative to 100% by mass of the total first agent is not limited, but its lower limit can be set to 0.01% by mass, further to 0.5% by mass, and even further to 0.1% by mass. Additionally, its upper limit can be set to 10% by mass, further to 5% by mass, and even further to 3% by mass. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 10% by mass, further to 0.5 to 5% by mass, and even further to 0.1 to 3% by mass.

[0109] <3-6> Preservatives Examples of preservatives include phenoxyethanol, methylparaben, ethylparaben, propylparaben, isopropylparaben, butylparaben, and sodium benzoate. One or more of these can be used together. In this hair dye, phenoxyethanol is preferred. When preservatives are included, their proportion is not limited, but relative to 100% by mass of the first agent, it can be set to 0.01% by mass or more, and further, 0.1% by mass or more. Alternatively, it is usually 3% by mass or less. Furthermore, preservatives can also be mixed into the second agent described above. In this case, the same type as described above can be selected, and the same proportion can be set.

[0110] <3-7> Antioxidants Examples of antioxidants include ascorbic acid (L-ascorbic acid) and anhydrous sodium sulfite. One or more of these can be used together.

[0111] <3-8> Stabilizer Examples of stabilizers include phenacetin, 8-hydroxyquinoline, acetanilide, sodium pyrophosphate, barbituric acid, uric acid, and tannic acid. One or more of these can be used together.

[0112] <3-9> Plant extracts Examples of plant extracts include avocado extract, sweet tea extract, aloe vera extract, apricot extract, apricot kernel extract, ginkgo extract, fennel extract, turmeric extract, scutellaria baicalensis extract, phellodendron bark extract, St. John's wort extract, orange extract, seaweed extract, Japanese chamomile extract, chamomile extract, licorice extract, gardenia extract, bearberry extract, grapefruit extract, mulberry extract, blueberry extract, and burdock extract. SasA extract, hawthorn extract, Sichuan pepper extract, mallow extract, rehmannia extract, perilla extract, linden extract, peony extract, ginger extract, birch extract, horsetail extract, sage extract, hawthorn extract, thyme extract, tea extract, clove extract, houttuynia cordata extract, hibiscus extract, witch hawthorn extract, parsley extract, loquat extract, loofah extract, safflower extract, peppermint extract, linden extract, hops extract, pine extract, horse chestnut extract, soapberry extract, eucalyptus extract, grapefruit extract, coix seed extract, artemisia extract, lychee extract, lavender extract, apple extract, lemon extract, astragalus extract, rose extract, rosemary extract, Roman chamomile extract, etc. These can be used alone or in combination with two or more. Additionally, plant extracts can be mixed into the second agent mentioned above. In this case, the same types as described above can also be selected.

[0113] <3-10> Other ingredients In addition to the above, it may also contain flavorings, sugars (maltose, trehalose, N-acetylglucosamine, etc.), inorganic salts (sodium chloride, sodium carbonate, etc.), buffers (sodium phosphate, etc.), chelating agents (ethylenediaminetetraacetic acid and its salts, diethylenetriaminepentaacetic acid and its salts, hydroxyethyl diphosphate and its salts, etc.), vitamins, colorants and ultraviolet absorbers, and at least one of the substances listed in the "Standards for Raw Materials of Pharmaceutical External Products" (revised in March 2021, Pharmaceutical Daily). Only one of these can be used, or two or more can be used in combination. Furthermore, other ingredients may also be mixed into the second agent mentioned above. In this case, the same types as described above can also be selected.

[0114] <3-11> Dosage form, properties and packaging materials The dosage form of the first agent (at 25°C) is not limited, and can be, for example, cream, emulsion, dispersion, paste, foam, liquid, aqueous solution, gel, or solid. Its properties are not limited, nor is its specific viscosity; for example, it can be from 1 to 300,000 mPa·s. When the first agent is adjusted to a viscous liquid state, it can be, for example, from 2,000 to 300,000 mPa·s. The lower limit of this viscosity can be set to 2,000 mPa·s, or above 4,000 mPa·s, or even 8,000 mPa·s. On the other hand, the upper limit of the viscosity can be set to 250,000 mPa·s, 225,000 mPa·s, or 200,000 mPa·s. These upper and lower limits can be combined individually. That is, for example, it can be set to 2000 to 250000 mPa·s, it can be set to 4000 to 225000 mPa·s, and it can be set to 8000 to 200000 mPa·s. Furthermore, the above viscosity values ​​are measured using a Type B viscometer at 25°C. There are no restrictions on the packaging material for the first dose; it can be tubular packaging material, pump packaging material, liquid storage container, etc.

[0115] <4> Application of hair cosmetics Hair cosmetics can be applied to the hair by mixing the first and second agents together, or by applying them separately. For example, the first and second agents can be mixed together on the hair. During application, tools such as combs, brushes, and spatulas can be used to apply the hair cosmetics to the hair. Alternatively, the user can apply it to the hair with their hands. Only one type can be used, or two or more can be used together. Furthermore, hair cosmetics can be applied to hair that is wet with water or warm water, or to dry hair. Furthermore, hair includes hair from various parts of the body, such as head hair, beard, eyebrows, and body hair. There are no limitations on the type of biological hair that can be applied, but human hair is preferred. When applied to human hair, it can be applied to hair of any condition and color. That is, for example, it can be applied to black hair, white hair, bleached hair (black hair that has undergone bleaching), and already dyed hair. Furthermore, applying it to already dyed hair includes repairing, altering, or adding color to already dyed hair.

[0116] [2] Regarding the second group of inventions [1] Hair cosmetics The hair cosmetic of this second group of invention is a hair cosmetic used by mixing a first agent and a second agent, characterized in that: when the first agent is 100% by mass, it contains more than 1.5% by mass of (A1) surfactant and forms an oil droplet-dispersible (O / W) emulsion; the second agent contains (B2) oily components and forms a water droplet-dispersible (W / O) emulsion.

[0117] The first agent forms an oil-droplet-dispersible (O / W) emulsion. An O / W emulsion is an emulsion in which the aqueous component forms the continuous phase, and the oil component is dispersed within this continuous phase. That is, it can be described as an emulsion in which the aqueous component forms the external phase and the oil component forms the internal phase. Furthermore, the O / W emulsion state can be determined in any way; for example, by adding the agent to water and stirring (light stirring). If the agent diffuses in the water, it can be determined that the agent is in an O / W emulsion state.

[0118] The second agent forms a water-to-oil (W / O) emulsion. A water-to-oil (W / O) emulsion is an emulsion in which the oil-based components form the continuous phase, and the aqueous components are dispersed within this continuous phase. That is, it can be described as an emulsion in which the oil-based components form the external phase and the aqueous components form the internal phase. Furthermore, the W / O emulsion state can be determined in any way; for example, by adding the agent to water and stirring (light stirring). If the agent does not diffuse in the water and remains unchanged, then the agent can be determined to be in a W / O emulsion state.

[0119] Hair cosmetics are used by mixing a first agent and a second agent. The emulsification state of the mixture (the mixed hair cosmetic) obtained by mixing the first and second agents is not limited; it can be an O / W emulsion or a W / O emulsion. Among these, for example, when the hair cosmetic is an oxidative hair dye, bleaching agent, desaturating agent, or bleaching and desaturating agent, an O / W emulsion state is preferred. This is because when the external phase is aqueous, the active ingredients can easily penetrate into the hair and exert their effects more effectively. Furthermore, it has the advantage of being easy to rinse.

[0120] [2] First dose When the first agent is 100% by mass, it contains more than 1.5% by mass of surfactant (A1).

[0121] <1> Surfactants Examples of surfactants include nonionic surfactants (Al-1), cationic surfactants, anionic surfactants, and amphoteric surfactants. One type or more can be used. Surfactants are formulated, for example, to stably contain oily components in the first agent and to achieve good miscibility. Of the surfactants contained in the first agent, a nonionic surfactant (A1-1) is preferred. Compared with surfactants other than nonionic surfactants, using a nonionic surfactant (A1-1) results in better formulation stability (especially when the first agent contains dyes and / or alkalis) and improves miscibility when mixed with a second agent in a W / O emulsion state. Furthermore, it is preferable to use two or more nonionic surfactants (A1-1) in the first agent. This is because compared with using only one, using two or more nonionic surfactants (A1-1) results in better formulation stability (especially when the first agent contains dyes and / or alkalis) and improves miscibility.

[0122] Examples of nonionic surfactants include ether-type nonionic surfactants, ester-type nonionic surfactants, and alkyl glycosides. One type or two or more can be used together. Among these, ether-type nonionic surfactants are preferred from the viewpoint of effectively suppressing clumping when the first and second agents are mixed. Furthermore, ether-type nonionic surfactants are also preferred from the viewpoint of improving formulation stability (especially when the first agent contains dyes and / or alkalis) and enhancing miscibility when mixed with a W / O emulsion-like second agent.

[0123] Examples of ether-type nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene alkylphenyl ethers, and polyoxyalkylene phenyl ethers. One type can be used, or two or more can be used in combination.

[0124] Examples of polyoxyalkylene oxide surfactants in the aforementioned ether-type nonionic surfactants include polyoxyethylene (POE) and polyoxypropylene (POP). One type can be used, or two or more can be used in combination. Examples of alkyl groups in the aforementioned ether-type nonionic surfactants include cetyl, stearyl, behenyl, lauryl, myristyl, octyldodecyl, hexyldecyl, isostearyl, and decyltetradecyl. One or more of these can be used together. The alkenyl groups in the aforementioned ether-type nonionic surfactants can include oleyl groups, among others. One type can be used, or two or more can be used in combination. Examples of alkylphenyl surfactants in the aforementioned ether-type nonionic surfactants include nonylphenyl and octylphenyl. One or more of these can be used, or they can be used in combination. The aforementioned polyoxyalkylene groups can be appropriately combined with the aforementioned alkyl, alkenyl, alkylphenyl, etc.

[0125] Among the aforementioned polyoxyalkylene ethers, examples include POE stearyl ether (stearyl polyether), POE cetyl ether (cetyl alcohol polyether), POE oleyl ether (oleyl alcohol polyether), POE behenyl ether (behenyl alcohol polyether), POE lauryl ether (lauryl alcohol polyether), POE myristyl ether, POE octyl dodecyl ether, POE hexyl decyl ether, POE isostearyl ether, POE·POP cetyl ether, and POE·POP decyl tetradecyl ether. Only one of these can be used, or two or more can be used in combination. From a mixing perspective, POE alkylene ethers are preferred, and POE stearyl ether, POE cetyl ether, and POE oleyl ether are further preferred.

[0126] Among the above, stearyl alcohol polyethers include POE(2) stearyl ether, POE(4) stearyl ether, POE(5) stearyl ether, POE(20) stearyl ether, POE(150) stearyl ether, etc. Only one type can be used, or two or more can be used together. Examples of cetyl alcohol polyethers include POE(2) cetyl ether, POE(4) cetyl ether, POE(5) cetyl ether, POE(5.5) cetyl ether, POE(6) cetyl ether, POE(7) cetyl ether, POE(10) cetyl ether, POE(15) cetyl ether, POE(20) cetyl ether, POE(23) cetyl ether, POE(25) cetyl ether, POE(30) cetyl ether, and POE(40) cetyl ether. Only one type can be used, or two or more can be used in combination. As oleyl alcohol polyethers, examples include POE(2) oleyl ether, POE(3) oleyl ether, etc.; POE(4.2) lauryl ether, POE(7) oleyl ether, POE(9) lauryl ether, POE(10) oleyl ether, POE(15) oleyl ether, POE(20) oleyl ether, POE(50) oleyl ether, etc. Only one of these can be used, or two or more can be used together.

[0127] Examples of behenyl alcohol polyethers include POE(2) behenyl ether, POE(3) behenyl ether, POE(5) behenyl ether, POE(6) behenyl ether, POE(10) behenyl ether, POE(20) behenyl ether, POE(30) behenyl ether, and POE(150) behenyl ether. Only one type can be used, or two or more can be used in combination. Examples of lauryl alcohol polyethers include POE(2) lauryl ether, POE(3) lauryl ether, POE(21) ​​lauryl ether, and POE(25) lauryl ether. Examples of POE myristyl ethers include POE(2) myristyl ether and POE(3) myristyl ether. Only one type can be used, or two or more can be used together. Examples of POE octyl dodecyl ethers include POE(2) octyl dodecyl ether and POE(5) octyl dodecyl ether. Only one type can be used, or two or more can be used together. Examples of POE hexyldecyl ethers include POE(2) hexyldecyl ether and POE(4) hexyldecyl ether. Only one type can be used, or two or more can be used together. Examples of POE isostearyl ethers include POE(5) isostearyl ether. Only one type can be used, or two or more can be used together. Examples of POE·POP cetyl ethers include POE(10)POP(4) cetyl ether, POE(20)POP(4) cetyl ether, POE(20)POP(8) cetyl ether, and POE(1)POP(4) cetyl ether. Only one type can be used, or two or more can be used in combination. Examples of POE·POP decyltetradecyl ethers include POE(12)POP(6) decyltetradecyl ether. Only one type of these can be used, or two or more can be used together.

[0128] Among the aforementioned examples of polyoxyalkylene ethers, POE oleyl ethers (oleyl alcohol polyethers) are a good example. One type can be used, or two or more can be used in combination. Furthermore, as oleyl alcohol polyethers, examples include POE (2) oleyl ether, POE (3) oleyl ether, etc.; POE (4.2) lauryl ether, POE (7) oleyl ether, POE (9) lauryl ether, POE (10) oleyl ether, POE (15) oleyl ether, POE (20) oleyl ether, POE (50) oleyl ether, etc. Only one of these can be used, or two or more can be used together.

[0129] Among the above, examples of polyoxyalkylene alkylphenyl ethers include POE nonylphenyl ether and POE octylphenyl ether. Only one type can be used, or two or more can be used in combination.

[0130] On the other hand, among nonionic surfactants, ester-type nonionic surfactants include POE sorbitol monooleate, POE sorbitol monostearate, POE sorbitol monopalmitate, POE sorbitol monolaurate, POE sorbitol trioleate, and other POE sorbitol fatty acid esters; POE glyceryl monostearate, POE glyceryl monomyristate, and other glyceryl monofatty acid esters; and POE sorbitol tetraoleate, POE sorbitol hexastearate, POE sorbitol monolaurate, and other POE sorbitol fatty acid esters. The POE addition molar number of POE sorbitol fatty acid esters and monoglyceryl monofatty acid esters is, for example, 5 or more. The POE addition molar number of POE sorbitol fatty acid esters is, for example, 6 or more. In addition, other ester-type nonionic surfactants include POE (6) sorbitol beeswax, polyethylene glycol monooleate, polyethylene glycol monostearate, polyethylene glycol monolaurate, lipophilic glyceryl monooleate, lipophilic glyceryl monostearate, self-emulsifying glyceryl monostearate, dehydrated sorbitol monooleate, dehydrated sorbitol sesquioleate, dehydrated sorbitol trioleate, dehydrated sorbitol monostearate, dehydrated sorbitol monopalmitate, dehydrated sorbitol monolaurate, sucrose fatty acid esters, decaglyceryl monolaurate, decaglyceryl monostearate, decaglyceryl monooleate, decaglyceryl monomyristate, POE reduced lanolin, etc. Only one of these can be used, or two or more can be used in combination.

[0131] When the first agent contains a nonionic surfactant (A1-1), the proportion of nonionic surfactant (A1-1) relative to 100% by mass of the total first agent is not limited, but the lower limit for the proportion of nonionic surfactant (A1-1) in the first agent is 1.5% by mass or more. This proportion can be further set to 1.7% by mass or more, 1.9% by mass or more, 2.0% by mass or more, 2.1% by mass or more, or 2.2% by mass or more. Similarly, while the proportion of nonionic surfactant (A1-1) in the first agent is not limited, the upper limit can be set to 10% by mass or less, 8% by mass or less, 6% by mass or less, 5% by mass or less, or 4% by mass or less. The above upper and lower limits can be combined. That is, for example, it can be set to 1.5 to 10% by mass, further to 1.7 to 8% by mass, further to 1.9 to 8% by mass, further to 2.0 to 6% by mass, further to 2.1 to 5% by mass, and further to 2.2 to 4% by mass. Alternatively, it can be set to 1.5 to 5% by mass, further to 2.0 to 4% by mass, and further to 2.2 to 4% by mass.

[0132] When using a nonionic surfactant (A1-1) in the first agent, as mentioned above, it is preferable to use two or more types rather than just one. Especially from a mixing perspective, it is preferable to use two types with different HLB values; more specifically, it is preferable to use two types: a nonionic surfactant with an HLB of less than 10 (A1-1-1) and a nonionic surfactant with an HLB of 10 or higher (A1-1-2). Among the aforementioned nonionic surfactants, examples of (A1-1-1) nonionic surfactants with an HLB value less than 10 include stearyl alcohol polyether-1 to 5, cetyl alcohol polyether-1 to 5, oleyl alcohol polyether-1 to 5, behenyl alcohol polyether-1 to 5, lauryl alcohol polyether-1 to 3, and cetyl alcohol polyether-1 to 4. Only one of these can be used, or two or more can be used in combination. On the other hand, among the aforementioned nonionic surfactants, examples of (A1-1-2) nonionic surfactants with an HLB value of 10 or higher include stearyl alcohol polyether-7 to 50, cetyl alcohol polyether-6 to 50, oleyl alcohol polyether-7 to 100, behenyl alcohol polyether-10 to 50, lauryl alcohol polyether-5 to 50, and cetyl alcohol polyether-7 to 50. Only one of these can be used, or two or more can be used in combination.

[0133] Furthermore, the HLB value mentioned above is a numerical value indicating the affinity of a surfactant for water and oil (water-insoluble organic compounds). HLB values ​​range from 0 to 20; the closer to 0, the higher the lipophilicity, and the closer to 20, the higher the hydrophilicity. The HLB value was determined according to "20.3.1 HLB Value Measured by Emulsification Method" (pages 854-855) as described in the "Handbook - Cosmetic and Pharmaceutical Raw Materials - Revised Edition" (published February 1, 1952, Nikko Chemical Co., Ltd.). The method for determining the HLB value in this specification is based on this method.

[0134] When the first agent is used as a nonionic surfactant (A1-1) in combination with (A1-1-2), the content ratio (A1-1-1) / (A1-1-2) is not limited, but from the viewpoint of effectively suppressing the formation of agglomerates when the first and second agents are mixed, it is preferable that (A1-1-1) / (A1-1-2) ≤ 1. The lower limit can be set to 0.01 or more, further to 0.1 or more, further to 0.2 or more, or further to 0.3 or more. Similarly, the upper limit can be set to 1.1 or less, further to 0.9 or less, further to 0.7 or less, or further to 0.5 or less. The above upper and lower limits can be combined individually. That is, for example, it can be set to 0.01 to 1.1, further to 0.1 to 0.9, further to 0.2 to 0.7, or further to 0.3 to 0.5.

[0135] On the other hand, among the aforementioned surfactants, cationic surfactants include alkyl quaternary ammonium salts such as monoalkyl, dialkyl, trialkyl, benzalkonium chloride, and monoalkyl ether quaternary ammonium salts; amine salts such as alkylamine salts, fatty acid amide amine salts, ester-containing tertiary amine salts, and Acrobel-type tertiary amine salts; cyclic quaternary ammonium salts such as alkylpyridinium salts and alkyl isoquinolineium salts; and benzyl chloride, etc. Only one of these can be used, or two or more can be used in combination. Combining cationic surfactants further improves the miscibility.

[0136] Among these, alkyl quaternary ammonium salts are preferred, monoalkyl quaternary ammonium salts and / or dialkyl quaternary ammonium salts are more preferred, and monoalkyl quaternary ammonium salts are even more preferred.

[0137] Examples of monoalkyl quaternary ammonium salts include behenyltrimethylammonium chloride (behenyltrimethylammonium chloride), lauryltrimethylammonium chloride, lauryltrimethylammonium bromide, alkyl(16,18)trimethylammonium chloride, cetyltrimethylammonium chloride (cetrimethylammonium chloride), cetyltrimethylammonium bromide, cetyltrimethylammonium saccharin, stearyltrimethylammonium chloride (stearyltrimethylammonium chloride), stearyltrimethylammonium bromide, cetyltrimethylammonium saccharin, stearyltrimethylammonium saccharin, and distearate di-stearyltrimethylammonium chloride. Methylammonium chloride, alkyl(28)trimethylammonium chloride, diPOE(2)oleylmethylammonium chloride, diPOEstearylmethylammonium chloride, POE(1)POP(25)diethylmethylammonium chloride, POP methyldiethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, dicocoyldimethylammonium chloride, lanolin fatty acid aminopropylethyldimethylammonium ethyl sulfate, behenyltrimethylammonium methyl sulfate, hydroxyethylcellulose dimethyldiallylammonium chloride, etc. Only one of these can be used, or two or more can be used together.

[0138] In addition, among the surfactants mentioned above, anionic surfactants include alkyl ether sulfates, POE alkyl ether sulfates, alkyl sulfates, alkenyl ether sulfates, alkenyl sulfates, olefin sulfonates, alkane sulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, α-sulfonic acid fatty acid salts, N-acyl amino acid type surfactants, phosphate monoester or diester type surfactants, and sulfosuccinates. Only one of these can be used, or two or more can be used in combination. Counterions for the anionic groups of these surfactants include sodium ions, potassium ions, and triethanolamine. Only one of these can be used, or two or more can be used in combination.

[0139] That is, for example, disodium lauryl sulfosuccinate, sodium lauryl sulfate, sodium myristyl sulfate, potassium lauryl sulfate, ammonium lauryl sulfate, triethanolamine lauryl sulfate, sodium cetyl sulfate, sodium stearyl sulfate, sodium POE lauryl ether sulfate, triethanolamine POE lauryl ether sulfate, ammonium POE lauryl ether sulfate, sodium POE stearyl ether sulfate, disodium lauryl sulfosuccinate, sodium stearoyl methyl taurate, triethanolamine dodecylbenzene sulfonate, sodium tetradecyl sulfonate, sodium lauryl phosphate, POE lauryl ether phosphate and its salts, N-lauroyl glutamate salts (sodium lauroyl glutamate, etc.), N-lauroyl methyl-β-alanine salts, N-acyl glycine salts, N-acyl glutamate salts, lauric acid as a higher fatty acid, myristic acid, and salts of these higher fatty acids. Only one of these can be used, or two or more can be used in combination.

[0140] Furthermore, among the surfactants mentioned above, amino acid-type amphoteric surfactants and betaine-type amphoteric surfactants can be listed as amphoteric surfactants. Among them, amino acid-type amphoteric surfactants include sodium lauroyl-N'-carboxymethyl-N'-hydroxyethyl ethylenediamine (sodium lauroyl amphoteric acetate), 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazoline betaine, undecylhydroxyethyl imidazoline betaine sodium, alkyl diaminoethyl glycine hydrochloride, sodium N-cocoa fatty acid acyl-N'-carboxyethyl-N'-hydroxyethyl ethylenediamine, disodium N-cocoa fatty acid acyl-N'-carboxyethoxyethyl-N'-carboxyethyl ethylenediamine, disodium N-cocoa fatty acid acyl-N'-carboxymethoxyethyl-N'-carboxymethyl ethylenediamine, sodium lauryl diaminoethyl glycinate, sodium palm oil fatty acid acyl-N-carboxyethyl-N-hydroxyethyl ethylenediamine, etc., which are glycine-type amphoteric surfactants; sodium lauryl aminopropionate, sodium lauryl aminodipropionate, triethanolamine lauryl aminopropionate, etc., which are aminopropionic acid-type amphoteric surfactants; etc. You can use just one of these, or you can use two or more together.

[0141] In addition, among the surfactants mentioned above, betaine-type amphoteric surfactants include: cocoalkyl betaine, lauryl dimethylaminoacetic acid betaine, myristyl dimethylaminoacetic acid betaine, stearyl dimethylaminoacetic acid betaine, stearyl dimethyl betaine sodium, cocoacid fatty acid amamidopropyl betaine, palm oil fatty acid amamidopropyl betaine, lauryl amamidopropyl betaine, ricinoleic acid amamidopropyl betaine, stearyl dihydroxyethyl betaine, etc., all aminoacetic acid betaine-type amphoteric surfactants; and lauryl hydroxysulfonyl betaine, etc., all sulfonyl betaine-type amphoteric surfactants. These can be used alone or in combination with two or more.

[0142] When the first agent contains a surfactant, there is no particular limitation on the proportion of surfactant in 100% by mass of the total first agent, but its lower limit, from the viewpoint of mixing, is 0.01% by mass or more. This proportion can be further 0.05% by mass or more, and can be further 0.1% by mass or more. Similarly, there is no particular limitation on the proportion of surfactant in the first agent, but its upper limit, from the viewpoint of hair dyeing properties, removal power, formulation stability, and mixing properties, can be set to 15% by mass or less, further to 10% by mass or less, and can be further set to 5% by mass or less. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 15% by mass, further to 0.05 to 10% by mass, and can be further set to 0.1 to 5% by mass.

[0143] <2> Oily components (B1) In addition to the surfactants mentioned above, the first agent may also contain an oily component (B1). By incorporating the oily component (B1), the stability of the formulation can be improved, the user experience enhanced, and the application feel improved. Oily components (B1) can include: higher alcohols, hydrocarbons, oils, silicones, waxes, higher fatty acids, esters, etc. These can be used alone or in combination. Among them, higher alcohols, hydrocarbons, oils, and silicones are preferred oily components (B1).

[0144] In oily components, higher alcohols can be alcohols with a carbon chain of 6 or more carbon atoms. For example, higher alcohols containing 8 to 40 carbon atoms. Furthermore, their skeletons can be saturated or unsaturated, and can be straight-chain or branched. Specific examples include: cetearyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol (hexadecyl alcohol), stearyl alcohol, arachidyl alcohol, behenyl alcohol, 2-hexyldecyl alcohol, isostearyl alcohol, 2-octyldodecyl alcohol, decyltetradecyl alcohol, oleyl alcohol, linoleyl alcohol, linolenic acid alcohol, lanolin alcohol, phytosterols, cholesterol, etc. These can be used alone or in combination. Cetyl alcohol and stearyl alcohol are preferred as the first agent.

[0145] Oily components may include hydrocarbons such as: liquid paraffin (mineral oil), liquid isoparaffins, paraffin wax, olefin oligomers, polyisobutylene, hydrogenated polyisobutylene, synthetic squalane, squalene, squalane (hydrogenated squalene), polybutene, polyethylene (polyethylene wax), microcrystalline wax, petrolatum, ceresin, pure ceresin, limonene, turpentine, etc. These can be used individually or in combination. Petrolatum is preferred as the first agent.

[0146] Oily components include, for example, vegetable oils (vegetable fats) and animal fats (animal fats), etc. Vegetable oils include: camellia oil, rice bran oil, rice germ oil, macadamia seed oil, meadowfoam seed oil, jojoba seed oil, rice germ oil, sunflower seed oil, olive oil, grapeseed oil, almond oil, apricot kernel oil, peach kernel oil, peach oil, shea butter, rosehip oil, tea seed oil, camellia flower oil, argan oil, safflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, cocoa butter, corn oil, peanut oil, rapeseed oil, evening primrose oil, wheat germ oil, coix seed oil, avocado oil, carrot oil, castor oil, flaxseed oil, coconut oil, palm oil, etc. Animal fats include: beef tallow, lard, mink oil, egg yolk oil, etc. These can be used alone or in combination. The first agent is preferably a vegetable oil, with camellia oil, rice bran oil, and rice germ oil being the most preferred.

[0147] Among the oily components, silicones can include: dimethyl polysiloxane (polydimethylsiloxane), methylphenyl polysiloxane, decamethylcyclopentasiloxane, dodecylcyclohexasiloxane, hydroxyl-terminated dimethyl polysiloxane, high-polymer silicones with an average degree of polymerization of 650 to 10000, amino-modified silicones (aminoethylaminopropylmethylpolysiloxane·dimethylpolysiloxane copolymer (aminoethylaminopropylpolydimethylsiloxane) etc.), polyether-modified silicones, betaine-modified silicones, alkyl-modified silicones, alkoxy-modified silicones, mercapto-modified silicones, carboxyl-modified silicones, fluorine-modified silicones, etc. These can be used alone or in combination. The first agent is preferably polydimethylsiloxane and amino-modified silicone, and more preferably high-polymer methyl polysiloxane and aminoethylaminopropylpolydimethylsiloxane.

[0148] Oily components include waxes such as beeswax, candelilla wax, carnauba wax, jojoba oil, lanolin, whale wax, rice bran wax, sugarcane wax, palm wax, montan wax, cotton wax, bayberry wax, insect wax, kapok wax, and shellac wax. These can be used individually or in combination.

[0149] Among the oily components, higher fatty acids include: lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, hydroxystearic acid, 12-hydroxystearic acid, oleic acid, undecenoic acid, linoleic acid, ricinoleic acid, lanolin fatty acids, etc. These can be used individually or in combination with two or more.

[0150] Oily components include esters such as: diisopropyl adipate, diisobutyl adipate, dioctyl adipate, 2-hexyldecyl adipate, diisostearyl adipate, isopropyl myristate, cetyl octanoate, cetyl isooctanoate, isononyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, diisopropyl sebacate, octyl dodecyl myristate, isopropyl palmitate, ethylhexyl palmitate, butyl stearate, stearyl stearate, hexyl laurate, myristyl myristate, and oleic acid. Decyl ester, hexyl decyl dimethyl octanoate, triisodecyl myristate, isostearyl myristate, PPG-3 benzyl ether myristate, 2-ethylhexyl palmitate, octyl dodecyl castor oil ester, fatty acid (C10-30) (cholesterol / lanosterol) esters, lauryl lactate, cetyl lactate, myristyl lactate, octyl dodecyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cetyl decanoate, diisostearyl malate, lanolin derivatives, etc. These can be used individually or in combination with two or more.

[0151] When the first agent contains an oily component (B1), the proportion of the oily component (B1) in 100% by mass of the first agent is not particularly limited, but its lower limit can be set to 1% by mass or more, further to 2% by mass or more, further to 5% by mass or more, further to 7% by mass or more, and further to 9% by mass or more. Especially at 7% by mass or more, the flow inhibition effect and agglomeration inhibition effect are excellent. In addition, its upper limit can be set to 35% by mass or less, further preferably 30% by mass or less, further preferably 25% by mass or less, further preferably 20% by mass or less, and even more preferably 17% by mass or less. The above upper and lower limits can be combined. That is, for example, it can be set to 1 to 35% by mass, further preferably 2 to 30% by mass, further preferably 5 to 25% by mass, further preferably 7 to 20% by mass, and further preferably 9 to 17% by mass.

[0152] <3> Components other than surfactants and oily components In addition to the surfactant (A1) and oily component (B1) mentioned above, the first agent may also contain other ingredients. Other ingredients may include: alkaline agents, dyes, solubilizers, water-soluble polymers, preservatives, antioxidants, stabilizers, plant extracts, etc.

[0153] <3-1> Alkaline agent Alkaline agents are components that are alkaline in aqueous solution. For example, when the second agent contains an oxidizing agent, the alkaline agent can be mixed with the first and second agents, allowing the alkaline agent and oxidizing agent to coexist, decomposing or altering colored components such as melanin and dyes, thereby achieving visible color fading or decolorization. That is, regardless of whether the hair is dyed, hair decolorization can be achieved by decomposing or altering the melanin contained in the hair, and dye decolorization can be achieved by decomposing or altering the dye on the dyed hair. Furthermore, alkaline agents themselves have the effect of causing hair to swell, or a hair swelling-promoting effect that enhances this effect. Therefore, alkaline agents are components that can promote the aforementioned effects within the hair.

[0154] Alkaline agents can be listed as: organic bases, inorganic bases and their salts. Organic bases include: organic amines, basic amino acids (arginine, lysine and their salts, etc.), guanidines and their salts (guanidine carbonate, etc.). Specific examples include: monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, aminomethylpropanol (2-amino-2-methyl-1-propanol, etc.), aminomethylpropanediol (2-amino-2-methyl-1,3-propanediol, etc.), and alkylamines such as monoethylamine and isopropylamine. These organic bases can be used alone or in combination with two or more.

[0155] Inorganic bases can be listed as follows: hydroxides, chlorides, silicates, carbonates, bicarbonates, metasilicates, phosphates, sulfates, ammonia, etc. Specific examples include: alkali metal hydroxides such as sodium hydroxide, alkali metal carbonates such as sodium carbonate, alkali metal bicarbonates such as sodium bicarbonate, alkaline earth metal hydroxides such as magnesium hydroxide and calcium hydroxide, alkaline earth metal carbonates such as magnesium carbonate and calcium carbonate, ammonium salts such as ammonium carbonate and ammonium bicarbonate, etc. These inorganic bases can be used alone or in combination with two or more.

[0156] When the first agent contains an alkaline agent, its content is not particularly limited, but it can make the pH of the hair cosmetic exceed 7, exceed 8, or even exceed 9. On the other hand, there is no particular upper limit to the pH; it can usually be set below 13.5, below 13, or below 12. When the hair cosmetic is a hair dye, bleaching agent, desaturating agent, or decolorizing and desaturating agent, the above-mentioned range can more effectively achieve the decolorizing effect, hair swelling effect, and hair swelling promoting effect associated with the alkaline agent. These upper and lower limits can be combined arbitrarily. For example, the pH can exceed 7 and be below 13.5, further up to 8 to 13, or even further up to 9 to 12. In addition, the pH of the hair cosmetic is the pH after mixing the first and second agents, and is the pH at 25°C.

[0157] The proportion of alkaline agent in the first agent is not particularly limited. Relative to 100% by mass of the first agent, its lower limit can be set to 0.1% by mass or more, 0.5% by mass or more, or 3% by mass or more. On the other hand, its upper limit can be set to 17% by mass or less, 15% by mass or less, or 10% by mass or less. Superior hair dyeing power can be obtained within these ranges. The above upper and lower limits can be combined. For example, they can be set to 0.1 to 17% by mass, 0.5 to 15% by mass, or 3 to 10% by mass.

[0158] <3-2> Dyes When hair cosmetics are hair dyes, the dye may be contained together with an alkaline agent. Furthermore, the dye may be included in either the first or second agent, but is preferably included in the first agent. The dye is the component that contributes to hair dyeing, and conventionally known dyes can be used. Specific examples include oxidative dyes and direct dyes. These can be used alone or in combination of two or more. The aforementioned oxidative dye is composed of at least one of a dye intermediate and a coupling agent. The dye intermediate is the component that develops color through oxidative polymerization in the presence of an oxidizing agent. On the other hand, the coupling agent is the component that develops color through oxidative polymerization together with the dye intermediate in the presence of an oxidizing agent, enabling the achievement of color development that cannot be obtained by oxidative polymerization of dye intermediates alone.

[0159] Examples of dye intermediates include: p-phenylenediamine, toluene-2,5-diamine (p-toluenediamine), 2,2'-[(4-aminophenyl)imino]diethanol, N-phenyl-p-phenylenediamine, 4,4'-diaminodiphenylamine, 2-hydroxyethyl-p-phenylenediamine, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, o-chloro-p-phenylenediamine, 4-amino-m-cresol, 2-amino-4-hydroxyethylaminoanisole, 2,4-diaminophenol, 1,2,4-trihydroxybenzene, o-aminophenol, p-aminophenol, p-methylaminophenol, etc. In addition, dye intermediates include salts of the above compounds. Salts include acid addition salts. Examples of acid addition salts include inorganic acid addition salts such as hydrochlorides and sulfates, and organic acid addition salts such as acetates. These dye intermediates and their salts can be used alone or in combination of two or more.

[0160] Examples of coupling agents include 2,4-diaminophenoxyethanol, α-naphthol, 2,6-diaminopyridine, 5-amino-o-cresol, 5-(2-hydroxyethylamino)-2-methylphenol, resorcinol, catechol, pyrogallol, pyrogallol, gallic acid, hydroquinone, m-phenylenediamine, toluene-3,4-diamine, diphenylamine, 3,3'-iminodiphenylamine, 1,5-dihydroxynaphthalene, tannic acid, o-aminophenol, m-aminophenol, p-aminophenol, and p-methylaminophenol. Furthermore, coupling agents include salts of the aforementioned compounds. Salts include acid addition salts. Examples of acid addition salts include inorganic acid addition salts such as hydrochlorides and sulfates, and organic acid addition salts such as acetates. These coupling agents and their salts can be used alone or in combination.

[0161] Furthermore, of the compounds mentioned above, o-aminophenol, p-aminophenol, and p-methylaminophenol can be used as both dye intermediates and coupling agents. For example, when these compounds are used as dye intermediates, coupling agents other than those listed above can be used in conjunction. Similarly, when these compounds are used as coupling agents, dye intermediates other than those listed above can be used in conjunction.

[0162] The direct dyes mentioned above include ionic direct dyes and nonionic direct dyes. These can be used individually or in combination. Ionic direct dyes include acid dyes and basic dyes. These can also be used individually or in combination. Furthermore, nonionic direct dyes include HC dyes and disperse dyes. These can also be used individually or in combination.

[0163] Acid dyes include: Red No. 2, Red No. 3, Red No. 102, Red No. 104, Red No. 105, Red No. 106, Red No. 201, Red No. 203, Red No. 220, Red No. 227, Red No. 230 (1), Red No. 504, Yellow No. 4, Yellow No. 5, Yellow No. 202 (1), Yellow No. 202 (2), Yellow No. 203, Yellow No. 205, Orange No. 207, Orange No. 402, Green No. 3, Green No. 204, Green No. 401, Blue No. 1, Blue No. 2, Blue No. 202, Blue No. 204, Blue No. 404, Purple No. 401, Brown No. 201, Black No. 401, etc. These can be used individually or in combination with two or more.

[0164] Basic dyes include: basic red, basic orange, basic yellow, basic green, basic blue, basic purple, and basic brown. These can be used individually or in combination. Further examples of basic red dyes include: Basic Red 1, Basic Red 2, Basic Red 22, Basic Red 46, Basic Red 51, Basic Red 76, Basic Red 118, etc. Examples of basic orange dyes include: Basic Orange 1, Basic Orange 2, Basic Orange 31, etc. Examples of basic yellow dyes include: Basic Yellow 11, Basic Yellow 28, Basic Yellow 40, Basic Yellow 57, Basic Yellow 87, etc. Examples of basic green dyes include: Basic Green 1, Basic Green 4, etc. Examples of basic blue dyes include: Basic Blue 3, Basic Blue 6, Basic Blue 7, Basic Blue 9, Basic Blue 26, Basic Blue 41, Basic Blue 47, Basic Blue 75, Basic Blue 77, Basic Blue 99, Basic Blue 124, etc. Examples of basic violet dyes include: Basic Violet 1, Basic Violet 2, Basic Violet 3, Basic Violet 4, Basic Violet 14, and Basic Violet 16. Examples of basic brown dyes include: Basic Brown 4, Basic Brown 16, and Basic Brown 17. These can be used individually or in combination with two or more.

[0165] Examples of HC dyes include: HC red, HC orange, HC yellow, HC blue, and HC violet. These can be used individually or in combination. Further examples of HC red dyes include: HC Red 1, HC Red 3, HC Red 7, HC Red 10, HC Red 11, HC Red 13, HC Red 14, HC Red 17, HC Red 18, HC Red 19, HC Red 20, and HC Red 21. Examples of HC orange dyes include: HC Orange 1, HC Orange 2, HC Orange 3, HC Orange 6, and HC Orange 7. Examples of HC yellow dyes include: HC Yellow 2, HC Yellow 4, HC Yellow 5, HC Yellow 7, HC Yellow 9, HC Yellow 11, HC Yellow 13, HC Yellow 16, HC Yellow 18, HC Yellow 6, HC Yellow 10, HC Yellow 12, HC Yellow 14, HC Yellow 15, and HC Yellow 19. Examples of HC blue dyes include: HC Blue 2, HC Blue 5, HC Blue 6, HC Blue 8, HC Blue 9, HC Blue 10, HC Blue 11, HC Blue 12, HC Blue 13, HC Blue 14, HC Blue 15, HC Blue 16, HC Blue 18, HC Blue 19, HC Blue 20, etc. Examples of HC violet dyes include: HC Violet 1, HC Violet 2, HC Violet 3, HC Violet 4, etc. These can be used individually or in combination.

[0166] Disperse dyes include: Disperse Black 9, Disperse Blue 1, Disperse Blue 3, Disperse Blue 7, Disperse Brown 4, Disperse Orange 3, Disperse Red 11, Disperse Red 15, Disperse Red 17, Disperse Violet 1, Disperse Violet 4, and Disperse Violet 15. These can be used individually or in combination with two or more.

[0167] Other examples include: nitro dyes such as 4-nitro-o-phenylenediamine, 2-nitro-p-phenylenediamine, 2-amino-4-nitrophenol, 2-amino-5-nitrophenol, picric acid, and their salts; carotenoid pigments; anthraquinone pigments; flavonoid pigments (anthocyanin pigments, chalcone pigments, flavonoid pigments); dophenine pigments; diketone pigments; betalain pigments; and azophenin pigments. Specific examples include: madder pigment, extracted carotene, cochineal pigment, shellac pigment, purple cabbage pigment, perilla pigment, purple corn pigment, elderberry pigment, boysenberry pigment, grape skin pigment, grape juice pigment, purple sweet potato pigment, safflower yellow pigment, safflower red pigment, sorghum pigment, onion pigment, cocoa pigment, sandalwood pigment, spirulina blue pigment, chlorophyll, beet red, red yeast rice pigment, indigo, gardenia pigment, curcumin yellow pigment, annatto orange pigment, sodium copper chlorophyll, pepper pigment, shellac pigment, henna, rutin, safflower, and other natural dyes. These can be used individually or in combination.

[0168] There is no particular limitation on the proportion of dye, but when the first agent is set to 100% by mass, its lower limit can be set to 0.01% by mass or more, 0.1% by mass or more, or even 0.5% by mass or more. On the other hand, its upper limit can be set to 15% by mass or less, 10% by mass or less, or 6% by mass or less. These upper and lower limits can be combined arbitrarily. For example, it can be set to 0.01 to 15% by mass, 0.1 to 10% by mass, or 0.5 to 6% by mass.

[0169] <3-3> Solubilizer A solubilizer is a component that helps to solubilize the various ingredients contained in the first agent. Examples of solubilizers include water and alcohols. These can be used alone or in combination. From the viewpoint of achieving excellent solubility, water is preferred.

[0170] Alcohols include monohydric alcohols, polyhydric alcohols, and ether alcohols. These can be used individually or in combination of two or more.

[0171] The preferred monohydric lower alcohols among monohydric alcohols are those with 5 or fewer carbon atoms, such as ethanol, n-propanol, and isopropanol. These can be used alone or in combination of two or more. In addition, examples of monohydric aromatic alcohols include: benzyl alcohol, 2-phenylethanol, cinnamyl alcohol, phenylpropanol, 1-phenoxy-2-propanol, phenylethylene glycol, α-methylbenzyl alcohol, dimethylbenzylethanol, benzyloxyethanol, phenoxyethanol, phenoxyisopropanol, and p-anestinol. These can be used individually or in combination of two or more. Furthermore, as a monohydric alcohol with an ether bond, an ether alcohol with a total of three or more hydroxyl groups and ether bonds is preferred, specifically including: ethoxydiethylene glycol (diethylene glycol monoethyl ether), methoxydiethylene glycol (diethylene glycol monomethyl ether), diethylene glycol monobutyl ether, etc.

[0172] Of the above, monohydric alcohols are preferably ether alcohols, more preferably ether alcohols having a total of 3 or more hydroxyl groups and ether bonds, more preferably ethoxydiethylene glycol and / or methoxydiethylene glycol, and particularly preferably ethoxydiethylene glycol.

[0173] The valence of the polyol is not particularly limited and can be 6 or higher, but from the viewpoint of improving the solubility or dispersibility of the dye component, a valence of 2 to 5 is preferred. Furthermore, the number of carbon atoms in the polyol is not particularly limited; if it is a hydrocarbon group, it can have 6 or more carbon atoms, but from the viewpoint of improving the solubility or dispersibility of the dye component, a carbon number of 2 to 5 is preferred. Specific examples include: alkyl glycols such as ethylene glycol, propylene glycol, butanediol, and pentanediol; oxadiols such as diethanol and dipropanol; ethylene glycol; propylene glycol such as propane-1,2-diol and trimethylenediol; butylene glycol such as 1,2-butanediol, 1,3-butanediol, and 1,4-butanediol; pentanediols such as isopentylene glycol, 1,5-pentanediol, and 1,2-pentanediol; and alkyltriols such as glycerol, glycerol (1,2,3-butanetriol, 1,2,4-butanetriol, etc.), and glycerol (1,2,3-pentanetriol, 1,2,5-pentanetriol, 2,3,4-pentanetriol, etc.). These can be used individually or in combination with two or more.

[0174] Furthermore, examples of polyols containing ether bonds include polyalkylene glycols. Examples of polyalkylene glycols include polyethylene glycol. The average molecular weight (number average molecular weight) of polyethylene glycol is not particularly limited, but is typically 100 to 5000, preferably 100 to 2500, and more preferably 100 to 2000.

[0175] <3-4> Water-soluble polymers Water-soluble polymers include: water-soluble natural polymers, water-soluble semi-synthetic polymers, water-soluble synthetic polymers, and water-soluble inorganic polymers. These can be used alone or in combination with two or more. For example, water-soluble polymers can be used to adjust the viscosity of the first agent and subsequently, in hair cosmetics.

[0176] Examples of natural water-soluble polymers include: guar gum, sophora bean gum, quinine seed gum, carrageenan, galactomannan, gum arabic, tragacanth gum, pectin, mannan, xanthan gum, dextran, succinyl dextran, cydranolol, hyaluronic acid, gelatin, casein, albumin, collagen, dextrin, etc. These can be used individually or in combination.

[0177] Semi-synthetic water-soluble polymers include: cellulose-based water-soluble polymers, cationic guar gum, starch phosphate, propylene glycol alginate, and alginate. These can be used individually or in combination. In addition, examples of water-soluble cellulose polymers include: hydroxyethyl cellulose, hydroxyethyl cellulose dimethyl diallyl ammonium chloride, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, hydroxypropyl methyl cellulose, and cationic cellulose. These can be used individually or in combination with two or more.

[0178] Examples of synthetic water-soluble polymers include: polyvinyl alcohol (PVA), polyvinyl butyral, polyvinyl methyl ether, carboxyvinyl polymers, sodium polyacrylate, polyacrylamide, polyethylene oxide, ethylene oxide-propylene oxide block copolymers, acrylic acid / alkyl acrylate copolymers, polydimethylmethylenepiperidinium chloride, polyethylene glycol, and high-polymer polyethylene glycol. Additionally, copolymers composed of itaconic acid and POE alkyl ether half-esters, methacrylic acid and POE alkyl ether esters, and copolymers consisting of at least one monomer selected from acrylic acid, methacrylic acid, and their alkyl esters can also be included. These can be used individually or in combination.

[0179] When the first agent contains a water-soluble polymer, the proportion of the water-soluble polymer in 100% by mass of the total first agent is not particularly limited, but its lower limit can be set to 0.01% by mass or more, further to 0.05% by mass or more, and even further to 0.1% by mass or more. Furthermore, its upper limit can be set to 3% by mass or less, more preferably 2% by mass or less, and even more preferably 1% by mass or less. The above upper and lower limits can be combined. For example, it can be set to 0.01 to 3% by mass, further to 0.05 to 2% by mass, and even further to 0.1 to 1% by mass.

[0180] <3-5> Preservatives Preservatives include: phenoxyethanol, methylparaben, ethylparaben, propylparaben, isopropylparaben, butylparaben, isobutylparaben, sodium benzoate, etc. These can be used alone or in combination. In this hair dye, phenoxyethanol is preferred. When preservatives are present, there is no particular limit to their proportion, but relative to 100% by mass of the first agent, it can be set to 0.01% by mass or more, or 0.1% by mass or more. Alternatively, it is usually 3% by mass or less.

[0181] <3-6> Antioxidants Antioxidants include: ascorbic acid (L-ascorbic acid), anhydrous sodium sulfite, etc. These can be used alone or in combination with two or more.

[0182] <3-7> Stabilizer Stabilizers include: phenacetin, 8-hydroxyquinoline, acetanilide, sodium pyrophosphate, barbituric acid, uric acid, tannic acid, etc. These can be used individually or in combination with two or more.

[0183] <3-8> Plant extracts Plant extracts include: avocado extract, sweet tea extract, aloe vera extract, apricot extract, apricot kernel extract, ginkgo extract, fennel extract, turmeric extract, scutellaria baicalensis extract, phellodendron bark extract, St. John's wort extract, orange extract, seaweed extract, chamomile extract, licorice extract, gardenia extract, bear's eye extract, grapefruit extract, mulberry extract, blueberry extract, burdock extract. Sasae extract, hawthorn extract, Sichuan pepper extract, mallow extract, rehmannia extract, perilla extract, linden extract, peony extract, ginger extract, birch extract, horsetail extract, sage extract, hawthorn extract, thyme extract, tea extract, clove extract, houttuynia cordata extract, hibiscus flower extract, witch hazel extract, parsley extract, loquat extract, loofah extract, safflower extract, peppermint extract, linden extract, hops extract, pine extract, horse chestnut extract, soapberry extract, eucalyptus extract, grapefruit extract, coix seed extract, artemisia extract, lychee extract, lavender extract, apple extract, lemon extract, astragalus extract, rose extract, rosemary extract, Roman chamomile extract, etc. These can be used individually or in combination with two or more.

[0184] <3-9> Other ingredients In addition to the above, it may also contain flavorings, sugars (maltose, trehalose, N-acetylglucosamine, etc.), inorganic salts (sodium chloride, sodium carbonate, etc.), buffers (sodium phosphate, etc.), chelating agents (ethylenediaminetetraacetic acid and its salts, diethylenetriaminepentaacetic acid and its salts, hydroxyethylphosphonic acid and its salts, etc.), vitamins, coloring agents, and ultraviolet absorbers, as well as at least one ingredient selected from those listed in the "Standards for Quasi-Pharmaceutical Raw Materials" (revised in March 2021, Pharmaceutical Daily). These ingredients may be used alone or in combination.

[0185] <3-10> Dosage form, properties and packaging materials The dosage form of the first agent (at 25°C) is not particularly limited, and can be, for example, cream, emulsion, dispersion, paste, foam, liquid, aqueous solution, gel, or solid. Its properties are not particularly limited, nor is its specific viscosity; for example, it can be from 1 to 300,000 mPa·s. When the first agent is adjusted to a viscous liquid state, it can be, for example, from 2,000 to 300,000 mPa·s. The lower limit of this viscosity can be set to 2,000 mPa·s or more, 4,000 mPa·s or more, or 10,000 mPa·s or more. On the other hand, the upper limit of the viscosity can be set to 250,000 mPa·s or less, 225,000 mPa·s or less, or 200,000 mPa·s or less. These upper and lower limits can be combined. For example, the viscosity can be set to 2000 to 250000 mPa·s, 4000 to 225000 mPa·s, or 10000 to 200000 mPa·s. Furthermore, the viscosity values ​​mentioned above are measured using a Type B viscometer at 25°C. There are no particular restrictions on the packaging materials for the first dose; they can be tubular packaging materials, pump-type packaging materials, liquid storage containers, etc.

[0186] [3] Second dose The second agent contains (B2) oily components and is in an oil-water droplet (W / O) emulsion state.

[0187] <1> Oily components (B2) The second agent contains an oily component (B2). The presence of oily component (B2) improves formulation stability, user experience, and application feel. Examples of oily components (B2) include: higher alcohols (B2-1), silicones (B2-2), hydrocarbons, oils, waxes, higher fatty acids, esters, etc. These can be used alone or in combination with two or more. Among these, higher alcohols (B2-1) and silicones (B2-2) are preferred as the oily components (B2) in the second agent. Using these oily components facilitates the preparation of a cream with appropriate viscosity during mixing. Furthermore, this is also preferable from the perspective of the resulting user experience.

[0188] In oily components, higher alcohols (B2-1) can be alcohols with a carbon chain having 6 or more carbon atoms. For example, higher alcohols containing 8 to 40 carbon atoms. Furthermore, their skeletons can be saturated or unsaturated, and can be straight-chain or branched. Specific examples include: lauryl alcohol, myristyl alcohol, stearyl alcohol, cetyl alcohol, cetearyl alcohol, eicosanool, arachidyl alcohol, behenyl alcohol, docosanool, octacosanool, triacontanol, tritetracosanool, isostearyl alcohol, 2-hexyldecyl alcohol, 2-octyldodecyl alcohol, decyltetradecyl alcohol, oleyl alcohol, linoleyl alcohol, linolenic acid alcohol, lanolin alcohol, phytosterols, cholesterol, etc. These can be used individually or in combination with two or more.

[0189] The oily component (B2) is preferably a branched higher alcohol such as isostearyl alcohol, 2-hexyldecyl alcohol, 2-octyldodecyl alcohol, and decyltetradecyl alcohol. From a user experience perspective, higher alcohols with 10 or more carbon atoms in the branched hydrocarbon chain are further preferred; higher alcohols with 15 or more carbon atoms in the branched hydrocarbon chain are even more preferred; and higher alcohols with 15 or more carbon atoms in a saturated branched hydrocarbon chain are even more preferred. More specifically, 2-octyldodecyl alcohol (B2-1-1) and isostearyl alcohol (B2-1-2) are more preferred. These can be used individually or in combination, but combination is particularly preferred. That is, 2-octyldodecyl alcohol (B2-1-1) and isostearyl alcohol (B2-1-2) are preferably used in combination.

[0190] In the second agent, when a higher alcohol (B2-1) is used as an oily component (B2), and further when 2-octyldodecyl alcohol (B2-1-1) and isostearyl alcohol (B2-1-2) are used as a higher alcohol (B2-1), the ratio of these contents [(B2-1-1) / (B2-1-2)] is not particularly limited, but its lower limit can be set to 0.1 or more, further to 0.2 or more, further to 0.22 or more, further to 0.25 or more, further to 0.28 or more, further to 0.30 or more, and even further to 0.32 or more. On the other hand, its upper limit can be set to 10 or less, further to 5 or less, further to 4.5 or less, further to 4.0 or less, further to 3.5 or less, further to 3.0 or less, and even further to 2.5 or less. The ratio (B2-1-1) / (B2-1-2) within the above range can effectively balance the moisturizing and firming sensation of hair after use. The upper and lower limits mentioned above can be combined separately. For example, it can be set to 0.1 to 10, further to 0.2 to 5, further to 0.22 to 4.5, further to 0.25 to 4.0, further to 0.28 to 3.5, further to 0.30 to 3.0, and even further to 0.32 to 2.5.

[0191] Oily components include, for example, vegetable oils (vegetable fats) and animal fats (animal fats), etc. Vegetable oils include: camellia oil, rice bran oil, rice germ oil, macadamia seed oil, meadowfoam seed oil, jojoba seed oil, rice germ oil, sunflower seed oil, olive oil, grapeseed oil, almond oil, apricot kernel oil, peach kernel oil, peach oil, shea butter, rosehip oil, tea seed oil, camellia flower oil, argan oil, safflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, cocoa butter, corn oil, peanut oil, rapeseed oil, evening primrose oil, wheat germ oil, coix seed oil, avocado oil, carrot oil, castor oil, flaxseed oil, coconut oil, palm oil, etc. Animal fats include: beef tallow, lard, mink oil, egg yolk oil, etc. These can be used alone or in combination with two or more.

[0192] Among the oily components, silicones (B2-2) can include: dimethyl polysiloxane (polydimethylsiloxane), methylphenyl polysiloxane, decamethylcyclopentasiloxane, dodecylcyclohexasiloxane, hydroxyl-terminated dimethyl polysiloxane, high-polymer silicones with an average degree of polymerization of 650 to 10000, amino-modified silicones (aminoethylaminopropylmethylpolysiloxane·dimethylpolysiloxane copolymer (aminoethylaminopropylpolydimethylsiloxane) etc.), polyether-modified silicones, betaine-modified silicones, alkyl-modified silicones, alkoxy-modified silicones, mercapto-modified silicones, carboxyl-modified silicones, fluorine-modified silicones, etc. These can be used individually or in combination. In the second agent, from the perspective of ensuring the stability of the second agent formulation while having a high degree of freedom in formulation from low to high, especially considering that high formulation can impart a smooth feel and good shine to the treated hair, methylphenyl polysiloxane is preferred.

[0193] Oily components may include hydrocarbons such as: liquid paraffin (mineral oil), liquid isoparaffins, paraffin wax, olefin oligomers, polyisobutylene, hydrogenated polyisobutylene, synthetic squalane, squalene, squalane (hydrogenated squalene), polybutene, polyethylene (polyethylene wax), microcrystalline wax, petrolatum, ceresin, pure ceresin, limonene, turpentine, etc. These can be used individually or in combination.

[0194] Oily components include waxes such as beeswax, candelilla wax, carnauba wax, jojoba oil, lanolin, whale wax, rice bran wax, sugarcane wax, palm wax, montan wax, cotton wax, bayberry wax, insect wax, kapok wax, and shellac wax. These can be used individually or in combination.

[0195] Among the oily components, higher fatty acids include: lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, hydroxystearic acid, 12-hydroxystearic acid, oleic acid, undecenoic acid, linoleic acid, ricinoleic acid, lanolin fatty acids, etc. These can be used individually or in combination with two or more.

[0196] Oily components include esters such as: diisopropyl adipate, diisobutyl adipate, dioctyl adipate, 2-hexyldecyl adipate, diisostearyl adipate, isopropyl myristate, cetyl octanoate, cetyl isooctanoate, isononyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, diisopropyl sebacate, octyl dodecyl myristate, isopropyl palmitate, ethylhexyl palmitate, butyl stearate, stearyl stearate, hexyl laurate, myristyl myristate, and oleic acid. Decyl ester, hexyl decyl dimethyl octanoate, triisodecyl myristate, isostearyl myristate, PPG-3 benzyl ether myristate, 2-ethylhexyl palmitate, octyl dodecyl castor oil ester, fatty acid (C10-30) (cholesterol / lanosterol) esters, lauryl lactate, cetyl lactate, myristyl lactate, octyl dodecyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cetyl decanoate, diisostearyl malate, lanolin derivatives, etc. These can be used individually or in combination with two or more.

[0197] When the second agent contains an oily component (B2), the proportion of the oily component (B2) in 100% by mass of the second agent is not particularly limited, but its lower limit can be set to 10% by mass or more, further to 18% by mass or more, further to 20% by mass or more, and even further to 22% by mass or more. Furthermore, its upper limit can be set to 50% by mass or less, more preferably 30% by mass or less, more preferably 28% by mass or less, and even more preferably 27% by mass or less. The above upper and lower limits can be combined. For example, it can be set to 10 to 50% by mass, further preferably 18 to 30% by mass, further preferably 20 to 28% by mass, and even further preferably 22 to 27% by mass.

[0198] <2> Components other than oily components In addition to the aforementioned oily component (B2), the second agent may also contain other ingredients. These other ingredients include: oxidants, polymers, surfactants, stabilizers, preservatives, antioxidants, dispersants, protein derivatives and amino acids, chelating agents, plant extracts, herbal extracts, vitamins, pigments, fragrances, and ultraviolet absorbers. These can be used individually or in combination.

[0199] <2-1> Oxidizing agent When hair cosmetics are hair dyes, bleaching agents, desaturating agents, or decolorizing and desaturating agents, the second agent may contain an oxidizing agent. An oxidizing agent is a component that exerts an oxidizing effect, which is usually achieved by mixing with the first agent. Preferably, the oxidizing agent is included in the second agent, rather than in the first agent.

[0200] Oxidizing agents are only required to perform oxidative action, and their types are not particularly limited. For example, peroxide-based oxidizing agents can be listed. Peroxide-based oxidizing agents are compounds with the structure shown as "-OO-". This structure is contained as a peroxide ion (O2²⁻) in inorganic compounds and as a peroxide structure (-OO-) or percarboxylic acid structure (-CO-OO-) in organic compounds. These can be used alone or in combination.

[0201] Among the above, inorganic compounds in peroxide-based oxidants include: peroxides such as hydrogen peroxide (which can also be used as inclusion compounds or adducts of hydrogen peroxide, such as urea peroxide, melamine peroxide, hydrogen peroxide adducts of phosphates, hydrogen peroxide adducts of pyrophosphates, etc.); peroxide salts (alkali metal salts such as potassium and sodium salts, alkaline earth metal salts such as magnesium, calcium, strontium, and barium salts, and zinc salts); percarbonates (alkali metal salts such as potassium and sodium salts); perborates (alkali metal salts such as potassium and sodium salts); permanganates (alkali metal salts such as potassium and sodium salts, alkaline earth metal salts such as magnesium, calcium, strontium, and barium salts), etc. These can be used individually or in combination.

[0202] In addition, organic compounds in peroxide-based oxidants include percarboxylic acids such as performic acid, peracetic acid, and perbenzoic acid, as well as their salts. Salts of percarboxylic acids include alkali metal salts such as potassium and sodium salts. These can be used individually or in combination. Furthermore, non-peroxide oxidants (i.e., compounds that do not have the structure shown by "-OO-") can be listed as follows: bromates (alkali metal salts such as potassium salts and sodium salts), etc. These can be used alone or in combination with two or more.

[0203] When the second agent contains an oxidizing agent, the proportion of the oxidizing agent in 100% by mass of the total second agent is not particularly limited, but its lower limit can be set to 1% by mass or more, further to 3% by mass or more, further to 5% by mass or more, and even further to 8% by mass or more. Furthermore, its upper limit can be set to 40% by mass or less, more preferably 30% by mass or less, more preferably 25% by mass or less, and even more preferably 20% by mass or less. The above upper and lower limits can be combined. That is, for example, it can be set to 1 to 40% by mass, further preferably 3 to 30% by mass, and even further preferably 5 to 25% by mass.

[0204] <2-2> Polymers Polymers are compounds with high molecular weights. The presence of polymers can improve the stability of formulations (second agents) that are in a W / O emulsion state and contain oxidants. The structure of polymers is not particularly limited, but they are typically organic compounds with a carbon skeleton (i.e., polymer (A) usually does not contain silicone (C)). Furthermore, their molecular weight is not particularly limited, but is typically above 10,000.

[0205] Polymer compounds can be broadly classified into oil-soluble polymer compounds and water-soluble polymer compounds, and the second agent preferably contains at least one of these. That is, the polymer compound preferably contains an oil-soluble polymer compound and / or a water-soluble polymer compound.

[0206] Oil-soluble polymers are polymers that dissolve in the oil phase (i.e., the main component dissolved in the oil phase) of a W / O emulsion. Examples of oil-soluble polymers include: cellulose derivatives (oil-soluble cellulose derivatives), starch derivatives (oil-soluble starch derivatives), higher fatty acid esters, ethylene polymers (oil-soluble ethylene polymers), and acrylic polymers (oil-soluble acrylic polymers). These can be used individually or in combination. Furthermore, nonionic polymers (nonionic oil-soluble polymers) are preferred.

[0207] Examples of cellulose derivatives include cellulose ethers (oil-soluble cellulose ethers), cellulose esters, etc. These can be used individually or in combination. Furthermore, as mentioned above, these are preferably nonionic. For example, nonionic cellulose ethers are preferred. Examples of cellulose ethers include methylcellulose, ethylcellulose, and ethylmethylcellulose. These can be used individually or in combination. Among the aforementioned starch derivatives, examples include starch fatty acid esters and dextrin fatty acid esters. More specifically, examples include palmitic dextrin and ethylhexanoic acid dextrin. These can be used individually or in combination. Among the above, examples of higher fatty acid esters include: (behenic acid / eicosanoic acid) glycerides, behenic acid glycerides, eicosanoic acid glycerides, etc. These can be used alone or in combination with two or more.

[0208] Water-soluble polymers are polymers that dissolve in the aqueous phase (the second agent in a W / O emulsion), i.e., dissolved in water. Examples of water-soluble polymers include: cellulose derivatives (water-soluble cellulose derivatives), ethylene polymers (water-soluble ethylene polymers), and acrylic polymers (water-soluble acrylic polymers). These can be used individually or in combination.

[0209] Among the aforementioned, cellulose derivatives include: cellulose ethers (water-soluble cellulose ethers), cellulose esters, etc. These can be used individually or in combination of two or more. Examples of cellulose ethers include: carboxymethyl cellulose, carboxyethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methyl cellulose. These can be used individually or in combination. The aforementioned cellulose ethers can be any of the following: cationic cellulose ethers, anionic cellulose ethers, amphoteric cellulose ethers, and nonionic cellulose ethers. These can be used alone or in combination with two or more. However, from the viewpoint of providing a good user experience, cationic cellulose ethers (cationic water-soluble cellulose ethers) are particularly preferred in the second agent. Examples of cationic cellulose ethers include: O-[2-hydroxy-3-(trimethylammonium)propyl]hydroxyethyl cellulose (polyquaternium-10), etc.

[0210] Other examples of water-soluble polymers containing polysaccharides other than cellulose and exhibiting cationic properties include dextran hydroxypropyltrimethylammonium chloride, etc. Furthermore, examples of acrylic polymers mentioned above include polyquaternium-11 (vinylpyrrolidone·N,N-dimethylaminoethyl methacrylate copolymer sulfate solution), etc. These can be used individually or in combination of two or more.

[0211] When the second agent contains a polymer, the proportion of the polymer in 100% by mass of the second agent is not particularly limited, but its lower limit can be set to 0.01% by mass or more, further to 0.1% by mass or more, further to 0.5% by mass or more, and even further to 1.0% by mass or more. Furthermore, its upper limit can be set to 20% by mass or less, more preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3.0% by mass or less. The above upper and lower limits can be combined. For example, it can be set to 0.01 to 20% by mass, further preferably 0.1 to 10% by mass, further preferably 0.5 to 5% by mass, and even further preferably 1.0 to 3.0% by mass.

[0212] When the second agent, as a polymer compound, contains both an oil-soluble polymer (PO) and a water-soluble polymer (PW), the ratio of the content of each polymer compound (PO) / (PW) in 100% by mass of the second agent is not particularly limited, but its lower limit can be set to 0.1 or more, further to 0.5 or more, further to 1.0 or more, and even further to 1.5 or more. Furthermore, its upper limit can be set to 10 or less, more preferably 5 or less, more preferably 4 or less, and even more preferably 3 or less. The above upper and lower limits can be combined. For example, it can be set to 0.1 to 10, further to 0.5 to 5, further to 1.0 to 4, and even further to 1.5 to 3.

[0213] <2-3> Surfactants Surfactants can be listed as: cationic surfactants, anionic surfactants, nonionic surfactants, and amphoteric surfactants. These surfactants may be the same as those listed in the first agent above. They can be used alone or in combination of two or more. The second agent may contain surfactants, or it may not contain them at all. For example, the maximum percentage of surfactant in 100% by mass of the second agent may be set to less than 1% by mass, further to less than 0.5% by mass, and even further to less than 0.1% by mass.

[0214] <2-4> Stabilizers The second agent can be combined with a stabilizer. Combining a stabilizer can improve the stability of the oxidant. Examples of stabilizers include: phenoxyethanol (ethylene glycol phenyl ether), salicylic acid, salicylates, hydroxyethyl bisphosphonic acid, hydroxyethyl bisphosphonate, stannic acid, stannate, etc. Among these, the cations constituting the salts can include: alkali metal ions, ammonium ions, etc. These can be used individually or in combination with two or more.

[0215] <2-5> Preservatives Preservatives include: phenoxyethanol, methylparaben, ethylparaben, propylparaben, isopropylparaben, butylparaben, isobutylparaben, sodium benzoate, etc. These can be used alone or in combination. In this hair dye, phenoxyethanol is preferred. When preservatives are present, there is no particular limit to their proportion, but relative to 100% by mass of the first agent, it can be set to 0.01% by mass or more, or 0.1% by mass or more. Alternatively, it is usually 3% by mass or less.

[0216] <2-6> Antioxidants Antioxidants can be listed as the same antioxidants mentioned in the first agent above. These can be used alone or in combination of two or more.

[0217] <2-7> Plant extracts Plant extracts may include the same antioxidants listed in the first agent above. These can be used alone or in combination of two or more.

[0218] <2-8> Water When water is present, there is no particular limitation on its proportion, but the lower limit can be set at 30% by mass or more, further at 35% by mass or more, and even further at 40% by mass or more. Conversely, the upper limit can be set at 85% by mass or less, further at 80% by mass or less, and even further at 75% by mass or less. These upper and lower limits can be combined. For example, it can be set from 30% to 85% by mass, further at 35% to 80% by mass, and even further at 40% to 75% by mass.

[0219] <2-9> Other ingredients In addition to the above, it may also contain flavorings, sugars (maltose, trehalose, N-acetylglucosamine, etc.), inorganic salts (sodium chloride, sodium carbonate, etc.), buffers (sodium phosphate, etc.), chelating agents (ethylenediaminetetraacetic acid and its salts, diethylenetriaminepentaacetic acid and its salts, hydroxyethylphosphonic acid and its salts, etc.), vitamins, colorants, and ultraviolet absorbers, as well as at least one ingredient selected from those listed in the "Standards for Quasi-Pharmaceutical Raw Materials" (revised in March 2021, Pharmaceutical Daily). These can be used alone or in combination with two or more ingredients. Furthermore, other ingredients may also be added to the second preparation described above. In this case, the same types as described above may also be selected.

[0220] <2-10> Dosage form, properties and packaging materials The dosage form of the second agent (at 25°C) is not particularly limited, and can be, for example, cream, emulsion, dispersion, paste, foam, liquid, aqueous solution, gel, or solid. Its properties are not particularly limited, nor is its specific viscosity; for example, it can be from 1 to 300,000 mPa·s. When the second agent is adjusted to a viscous liquid state, it can be, for example, from 2,000 to 300,000 mPa·s. The lower limit of this viscosity can be set to 2,000 mPa·s or more, 4,000 mPa·s or more, or 10,000 mPa·s or more. On the other hand, the upper limit of the viscosity can be set to 250,000 mPa·s or less, 225,000 mPa·s or less, or 200,000 mPa·s or less. These upper and lower limits can be combined. For example, the viscosity can be set to 2000 to 250000 mPa·s, 4000 to 225000 mPa·s, or 10000 to 200000 mPa·s. Furthermore, the viscosity values ​​mentioned above are measured using a Type B viscometer at 25°C. There are no particular restrictions on the packaging materials for containing the second agent; they can be tubular packaging materials, pump-type packaging materials, liquid storage containers, etc.

[0221] [4] How to use hair cosmetics Hair cosmetics are formulations in which a first agent and a second agent are mixed before application to the hair. These first and second agents can be mixed before application to the hair or applied separately in sequence. For example, mixing the first and second agents before application to the hair can be done by mixing them on a tray and using the resulting mixture as a hair cosmetic. Conversely, not mixing the agents before application to the hair can be done by applying the first agent to the hair and then applying the second agent to the same hair, thus mixing them on the hair.

[0222] In addition, when applying hair cosmetics, tools such as combs, brushes, and spatulas can be used to apply them to the hair. Alternatively, the user's hands can be used. Application methods include dipping, spreading, and penetration. These can be used alone or in combination. Furthermore, hair cosmetics can be applied to hair that is wet with water or warm water, as well as to dry hair. In addition, hair includes hair from various parts of the body, such as head hair, beard, eyebrows, and body hair. Furthermore, there are no particular limitations on the types of biological hair that can be applied, but human hair is preferred. Moreover, when applied to human hair, it can be applied to hair of any condition and color. That is, it can be applied to black hair, gray hair, bleached hair (black hair that has undergone bleaching), and already dyed hair. Furthermore, application to already dyed hair includes repairing, altering, or adding color to already dyed hair.

[0223] [3] Regarding the third group of inventions [1] Hair cosmetics (first type of hair cosmetics) The first embodiment of the third group of inventions is a multi-form hair cosmetic composed of multiple independent hair cosmetic compositions. The hair cosmetic composition is characterized in that at least one of the hair cosmetic compositions is in an oil-water droplet emulsion state and contains (A) a nonionic surfactant.

[0224] Multi-component hair cosmetics consist of multiple independent hair cosmetic compositions. Multi-component hair cosmetics typically achieve their intended function by mixing multiple hair cosmetic compositions. Therefore, multi-component hair cosmetics are usually packaged separately, with each hair cosmetic composition unmixed before use. Furthermore, before use, the desired hair cosmetic compositions are mixed together, and the resulting mixture is applied to the hair, or the desired hair cosmetic compositions are sequentially applied to the hair, thereby forming a mixture of the hair cosmetic compositions on the hair for use.

[0225] In this specification, the hair cosmetic of the first aspect of the third group of invention refers to a hair cosmetic composition that is in an oil-water droplet emulsion state and contains (A) a nonionic surfactant, hereinafter referred to as "W / O type NIS-containing composition". Additionally, hair cosmetic compositions that are in an oil-droplet emulsion state in water are hereinafter referred to as "O / W type compositions". Furthermore, hair cosmetic compositions containing ester oils are hereinafter referred to as "ester oil-containing compositions". The above-mentioned W / O type NIS containing composition and ester oil containing composition can be different hair cosmetic compositions, or both of the above-mentioned compositions can be the same hair cosmetic composition. That is, the two being the same refers to, for example, a hair cosmetic composition containing both W / O type NIS containing composition and ester oil containing composition.

[0226] (1) Emulsified state Oil-to-water (W / O) emulsification is an emulsion state in which the oil-based components form a continuous phase, and the aqueous components are dispersed within this continuous phase. This can also be described as an emulsion state where the oil-based components form the external phase and the aqueous components form the internal phase. Furthermore, the W / O emulsion state can be determined by any method. For example, if the formulation is dropped into water and stirred (lightly), and the formulation does not diffuse into the water and maintains its original form, then the formulation can be determined to be in a W / O emulsion state.

[0227] In contrast, oil-drop emulsification in water (hereinafter referred to as "O / W type") is an emulsion state in which the aqueous components form a continuous phase, and the oil components are dispersed within this continuous phase. This can be described as an emulsion state where the aqueous components form the external phase and the oil components form the internal phase. Furthermore, the O / W type emulsion state can be determined by any method; for example, if the formulation diffuses into the water when dropped into water and stirred (light stirring), then the formulation can be determined to be in an O / W type emulsion state.

[0228] (2) Nonionic surfactant (A) Nonionic surfactants are nonionic surfactants. When hair cosmetic compositions in a W / O emulsion state contain nonionic surfactants, rinsing performance can be improved compared to those without nonionic surfactants. Furthermore, the gloss of the composition itself can be enhanced in W / O type NIS formulations.

[0229] There is no particular limitation on the type of nonionic surfactant used, but examples of nonionic surfactants include: ester-type nonionic surfactants, ether-type nonionic surfactants (including POE alkyl ethers described later), alkyl glycosides, etc. These can be used alone or in combination with two or more. From the viewpoint of further improving rinsing performance, nonionic surfactants other than POE alkyl ethers are preferred, ester-type nonionic surfactants are even more preferred, and ester-type nonionic surfactants having a fatty acid backbone (i.e., having fatty acid residues) are even more preferred.

[0230] Ester-type nonionic surfactants can be categorized as those possessing various fatty acid backbones. Specifically, examples include: POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan monopalmitate, POE sorbitan monolaurate, POE sorbitan trioleate, and other POE fatty acid esters; POE glyceryl monostearate, POE glyceryl monomyristate, and other glyceryl monofatty acid esters; and POE sorbitol tetraoleate, POE sorbitol hexastearate, POE sorbitol monolaurate, and other POE fatty acid esters. These can also be categorized as ester-type nonionic surfactants containing fatty acid residues. For example, the POE addition molar number of POE sorbitan fatty acid esters and monoglyceryl monofatty acid esters is 5 or more. For example, the POE addition molar number of POE sorbitol fatty acid esters is 6 or more. These can be used individually or in combination of two or more.

[0231] In addition, other ester-type nonionic surfactants include: POE (6) sorbitol beeswax, polyethylene glycol monooleate, polyethylene glycol monostearate, polyethylene glycol monolaurate, lipophilic glyceryl monooleate, lipophilic glyceryl monostearate, self-emulsifying glyceryl monostearate, sorbitan monooleate, sesquioleate sorbitan, trioleate sorbitan, sorbitan monostearate, sorbitan monopalmitate, sorbitan monolaurate, sucrose fatty acid esters, decaglyceryl monolaurate, decaglyceryl monostearate, decaglyceryl monooleate, decaglyceryl monomyristate, POE reduced lanolin, etc. These can be used individually or in combination with two or more.

[0232] Of the above, from the viewpoint of being less likely to cause emulsification and improve rinsing performance, POE sorbitan fatty acid ester is preferred, and from the viewpoint of being less likely to cause emulsification and improve rinsing performance, POE sorbitan monooleate is preferred.

[0233] Ether-type nonionic surfactants include: POE(5.5) cetyl ether, POE(6) cetyl ether, POE(6) cetyl ether, POE(7) cetyl ether, POE(10) cetyl ether, POE(15) cetyl ether, POE(20) cetyl ether, POE(23) cetyl ether, POE(25) cetyl ether, POE(30) cetyl ether, POE(40) cetyl ether, POE(2) cetyl ether, POE(4) cetyl ether, POE(5) cetyl ether, etc. POE cetyl ether (cetyl alcohol polyether); POE(20) stearyl ether POE(150) stearyl ether, POE(4) stearyl ether, POE(5) stearyl ether, POE(2) stearyl ether, etc. POE stearyl ether (stearyl alcohol polyether); POE(10) behenyl ether, POE(20) behenyl ether, POE(30) behenyl ether, POE(150) behenyl ether, POE(2) behenyl ether, POE(3) behenyl ether, POE(5) behenyl ether, POE(6) behenyl ether, etc. POE behenyl ether (behenyl alcohol polyether); POE(7) oil ether, POE(10) oil ether, POE(15) oil ether, POE (20) Oil ether, POE (50) oil ether, POE (2) oil ether, POE (3) oil ether, etc. POE oil ether (oil alcohol polyether); POE (4.2) lauryl ether, POE (9) lauryl ether, POE (10) lauryl ether, POE (21) lauryl ether, POE (25) lauryl ether, POE (2) lauryl ether, POE (3) lauryl ether, etc. POE lauryl ether (lauryl alcohol polyether); POE (2) myristyl ether, POE (3) myristyl ether, etc. POE myristyl ether; POE (2) octyl dodecyl ether, POE (5) octyl dodecyl Ethers such as POE octyl dodecyl ether; POE (2) hexyl decyl ether, POE (4) hexyl decyl ether, etc.; POE (5) isostearyl ether, etc.; POE nonyl phenyl ether; POE octyl phenyl ether; POE (10) POP (4) cetyl ether, POE (20) POP (4) cetyl ether, POE (20) POP (8) cetyl ether, POE (1) POP (4) cetyl ether, etc.; POE (12) POP (6) decyl tetradecyl ether, etc. Various POE alkyl ethers can be listed. These can be used alone or in combination with two or more.

[0234] There is no particular limitation on the proportion of nonionic surfactant contained in the NIS-containing composition. However, when the total NIS-containing composition is set to 100% by mass, the lower limit can be set to 0.01% by mass, further to 0.1% by mass, and even further to 0.3% by mass. On the other hand, the upper limit can be set to 10% by mass, further to 5% by mass, and even further to 3% by mass. The above upper and lower limits can be combined separately. That is, for example, it can be set to 0.01 to 10% by mass, further to 0.1 to 5% by mass, and even further to 0.3 to 3% by mass.

[0235] Furthermore, the NIS-containing composition can be used directly at this concentration, or it can be mixed with other hair cosmetic compositions constituting multi-form hair cosmetics. That is, the NIS-containing composition can be used as a mixture with other hair cosmetic compositions. An example of using it as a mixture is a multi-form oxidative hair dye. A multi-form oxidative hair dye consists of multiple hair cosmetic compositions, such as a first agent containing an alkaline agent, a second agent containing an oxidizing agent, etc., and a mixture obtained by mixing the first agent and the second agent can be used. When used as a mixture, the proportion of nonionic surfactant in the mixture is not particularly limited. Even if the proportion of nonionic surfactant is not particularly limited when used, when the total mixture is set to 100% by mass, the lower limit can be set to 0.025% by mass, further to 0.05% by mass, and even further to 0.15% by mass. On the other hand, the upper limit can be set to 5% by mass, further to 2.5% by mass, and even further to 1.5% by mass. The above upper and lower limits can be combined separately. That is, for example, it can be set to 0.025 to 5% by mass, further to 0.05 to 2.5% by mass, and even further to 0.15 to 1.5% by mass.

[0236] In addition, as described below, besides the nonionic surfactants mentioned above, cationic surfactants, anionic surfactants, and amphoteric surfactants may also be included in the NIS-containing composition, but are generally preferred to be substantially absent.

[0237] (3) Ester oil (B) Ester oil is one of the oily components described later. Multi-form hair cosmetics containing a W / O type NIS composition can be used as hair cosmetic compositions containing ester oil. When a multi-form hair cosmetic contains an ester oil composition, its rinsing performance is improved compared to those without an ester oil composition. Furthermore, the ester oil is preferably contained in the W / O type NIS containing composition, rather than in a composition other than the W / O type NIS containing composition. That is, it is preferred that the W / O type NIS containing composition and the ester oil containing composition are the same composition (a hair cosmetic composition in a W / O type emulsion state, containing a nonionic surfactant and the ester oil).

[0238] Examples of ester oils include tri(2-ethylhexanoic acid) glyceryl ester, cetyl 2-ethylhexanoate, diisopropyl adipate, diisobutyl adipate, dioctyl adipate, 2-hexyldecyl adipate, diisostearyl adipate, isopropyl myristate, cetyl octanoate, isoctyl cetyl isooctanoate, isononyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, diisopropyl sebacate, octyl dodecyl myristate, myristyl myristate, isotridecyl myristate, isostearyl myristate, PPG-3 benzyl ether myristate, isopropyl palmitate, ethylhexyl palmitate, and 2-ethylhexyl palmitate. The following substances are used: butyl stearate, stearyl stearate, hexyl laurate, decyl oleate, hexyl decyl dimethyl octanoate, octyl dodecyl castor oil, fatty acid (C10-30) (cholesterol / lanosterol) esters, ethylene glycol di(2-ethylhexanoate), pentaerythritol fatty acid esters, dipentaerythritol fatty acid esters, hydrogenated castor oil isostearate, lauryl lactate, cetyl lactate, myristyl lactate, octyl dodecyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cetyl decanoate, tricaprylic acid glyceride, diisostearate malate, dioctyl succinate, lanolin derivatives, etc. These can be used alone or in combination. Among these, substances that are liquid at room temperature (especially 25°C) are preferred, and from the viewpoint of easy rinsing, tri(2-ethylhexanoate) glyceride and cetyl 2-ethylhexanoate are particularly preferred.

[0239] When the hair cosmetic of the first type contains an ester oil composition, the proportion of ester oil contained in the ester oil composition is not particularly limited. However, when the total ester oil composition is 100% by mass, from the viewpoint of easy rinsing, the lower limit can be set to 0.01% by mass, further to 0.2% by mass, and even further to 0.5% by mass. On the other hand, from the viewpoint of formulation stability, the upper limit can be set to 15% by mass, further to 7% by mass, and even further to 3% by mass. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 15% by mass, further to 0.2 to 7% by mass, and even further to 0.5 to 3% by mass.

[0240] Furthermore, the ester-oil-containing composition can be used directly at this concentration, or it can be mixed with other hair cosmetic compositions constituting multi-form hair cosmetics. That is, the ester-oil-containing composition can be used as a mixture with other hair cosmetic compositions. When used as a mixture, the proportion of ester oil in the mixture is not particularly limited. Specifically, the proportion of ester oil used is not particularly limited; when the total mixture is 100% by mass, the lower limit can be set to 0.005% by mass, further to 0.1% by mass, and even further to 0.25% by mass. On the other hand, the upper limit can be set to 7.5% by mass, further to 3.5% by mass, and even further to 1.5% by mass. The above upper and lower limits can be combined separately. For example, it can be set to 0.005 to 7.5% by mass, further to 0.1 to 3.5% by mass, and even further to 0.25 to 1.5% by mass.

[0241] (4) Other ingredients The hair cosmetic compositions constituting the first type (multi-form hair cosmetic) may contain other ingredients besides the aforementioned nonionic surfactants and ester oils. Other ingredients may include oily components other than ester oils, polymeric compounds, oxidants, stabilizers, pH adjusters, preservatives, antioxidants, etc. These may be used individually or in combination.

[0242] (4-1) Oily components other than ester oils Other than ester oils, the oily components are preferably those included when the hair cosmetic composition is in a W / O emulsion state. By incorporating oily components, the formulation stability (stability in the W / O emulsion state), feel (hair feel after application of the hair cosmetic), and spreadability can be improved respectively. Other oily components besides esters include higher alcohols, silicones, hydrocarbons, fats, waxes, and higher fatty acids. These can be used individually or in combination. Higher alcohols and silicones are preferred. When the hair cosmetic composition constituting the first type of hair cosmetic (multi-dosage form hair cosmetic) contains higher alcohols and / or silicones, the formulation stability and feel (the feel of hair after applying the hair cosmetic composition) can be improved compared to the case without these ingredients.

[0243] Furthermore, higher alcohols and / or silicones are preferably included in the W / O type NIS-containing composition, rather than in the composition other than the W / O type NIS-containing composition. That is, the W / O type NIS-containing composition preferably contains higher alcohols and / or silicones. Furthermore, as mentioned above, since the W / O type NIS-containing composition and the ester oil-containing composition are preferably the same composition (a hair cosmetic composition in a W / O type emulsion state and containing a nonionic surfactant and an ester oil), as a hair cosmetic composition constituting the first type of hair cosmetic (multi-form hair cosmetic), it is particularly preferred to have a hair cosmetic composition in a W / O type emulsion state, containing a nonionic surfactant and an ester oil, and containing higher alcohols and / or silicones.

[0244] When a hair cosmetic composition contains an oily component other than an ester oil, the proportion of the oily component other than the ester oil is not particularly limited. However, when the total weight of the hair cosmetic composition is 100% by mass, the lower limit can be set to 5% by mass, further to 10% by mass, and even further to 15% by mass. On the other hand, the upper limit can be set to 50% by mass, further to 40% by mass, and even further to 30% by mass. The above upper and lower limits can be combined separately. That is, for example, it can be set to 50% by mass, further to 10% by 40% by mass, and even further to 15% by 30% by mass.

[0245] Among oily components other than ester oils, alcohols with a carbon chain having 6 or more carbon atoms can be used as higher alcohols. For example, higher alcohols containing 8 to 40 carbon atoms. Furthermore, their skeletons can be saturated or unsaturated, and can be straight-chain or branched. Specific examples include cetearyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol (hexadecyl alcohol), stearyl alcohol, arachidyl alcohol, behenyl alcohol, 2-hexyldecyl alcohol, isostearyl alcohol, 2-octyldodecyl alcohol, decyltetradecyl alcohol, oleyl alcohol, linoleyl alcohol, linolenic acid alcohol, lanolin alcohol, phytosterols, cholesterol, etc. These can be used alone or in combination. Among these, substances that are liquid at room temperature (especially 25°C) are preferred, isostearyl alcohol and / or 2-octyldodecyl alcohol are preferred, and isostearyl alcohol and 2-octyldodecyl alcohol are more preferred.

[0246] When a hair cosmetic composition contains higher alcohols, the proportion of higher alcohols is not particularly limited. However, when the total weight of the hair cosmetic composition is 100% by mass, the lower limit can be set to 3% by mass, further to 8% by mass, and even further to 12% by mass. On the other hand, the upper limit can be set to 50% by mass, further to 40% by mass, and even further to 30% by mass. The above upper and lower limits can be combined separately. That is, for example, it can be set to 3 to 50% by mass, further to 8 to 40% by mass, and even further to 12 to 30% by mass.

[0247] Furthermore, hair cosmetic compositions containing higher alcohols (higher alcohol-containing compositions) can be used directly at this concentration, or they can be mixed with other hair cosmetic compositions constituting multi-form hair cosmetics. That is, higher alcohol-containing compositions can be used as mixtures with other hair cosmetic compositions. When used as mixtures, the proportion of higher alcohols in the mixture is not particularly limited. Specifically, the proportion of higher alcohols used is not particularly limited; when the total mixture is 100% by mass, the lower limit can be set to 1.5% by mass, further to 4% by mass, and even further to 6% by mass. On the other hand, the upper limit can be set to 25% by mass, further to 20% by mass, and even further to 15% by mass. The above upper and lower limits can be combined separately. For example, they can be set to 1.5 to 25% by mass, further to 4 to 20% by mass, and even further to 6 to 15% by mass.

[0248] Among oily components other than ester oils, examples of silicones include dimethyl polysiloxane (polydimethylsiloxane), methylphenyl polysiloxane, decamethylcyclopentasiloxane, dodecylcyclohexasiloxane, hydroxyl-terminated dimethyl polysiloxane, high-polymer silicones with an average degree of polymerization of 650 to 10000, amino-modified silicones (aminoethylaminopropylmethylpolysiloxane-dimethylpolysiloxane copolymer (aminoethylaminopropylpolydimethylsiloxane) etc.), polyether-modified silicones, betaine-modified silicones, alkyl-modified silicones, alkoxy-modified silicones, mercapto-modified silicones, carboxyl-modified silicones, and fluorine-modified silicones. These can be used alone or in combination. Among these, substances that are liquid at room temperature (especially 25°C) are preferred. Furthermore, from the viewpoint of ensuring formulation stability while improving hair feel (combing ability), methylphenyl polysiloxane is preferred.

[0249] When a hair cosmetic composition contains silicone, the proportion of silicone is not particularly limited. However, when the total weight of the hair cosmetic composition is 100% by mass, the lower limit can be set to 0.1% by mass, further to 1% by mass, and even further to 2% by mass. On the other hand, the upper limit can be set to 40% by mass, further to 20% by mass, and even further to 10% by mass. The above upper and lower limits can be combined. That is, for example, they can be set to 0.1% to 40% by mass, further to 1% to 20% by mass, and even further to 2% to 10% by mass.

[0250] Furthermore, the silicone-containing hair cosmetic composition (silicone-containing composition) can be used directly at this concentration, or it can be mixed with other hair cosmetic compositions constituting multi-form hair cosmetics. That is, the silicone-containing composition can be used as a mixture with other hair cosmetic compositions. When used as a mixture, the proportion of silicone in the mixture is not particularly limited. Specifically, the proportion of silicone used is not particularly limited; when the total mass of the mixture is 100%, the lower limit can be set to 0.05% by mass, further to 0.5% by mass, and even further to 1% by mass. On the other hand, the upper limit can be set to 20% by mass, further to 10% by mass, and even further to 5% by mass. The above upper and lower limits can be combined separately. For example, it can be set to 0.05 to 20% by mass, further to 0.5 to 10% by mass, and even further to 1 to 5% by mass.

[0251] Other than ester oils, oily components that are hydrocarbons include liquid paraffin (mineral oil), liquid isoparaffins, paraffin wax, olefin oligomers, polyisobutylene, hydrogenated polyisobutylene, synthetic squalane, squalene, squalane (hydrogenated squalene), polybutene, polyethylene (polyethylene wax), microcrystalline wax, petrolatum, ceresin, pure ceresin, limonene, turpentine, etc. These can be used individually or in combination. Among these, substances that are liquid at room temperature (especially 25°C) are preferred.

[0252] Other than ester oils, oils and fats can be categorized as such, including vegetable oils (vegetable fats) and animal oils (animal fats). Vegetable oils include camellia oil, rice bran oil, rice germ oil, macadamia seed oil, meadowfoam seed oil, jojoba seed oil, rice germ oil, sunflower seed oil, olive oil, grapeseed oil, almond oil, apricot kernel oil, peach kernel oil, peach oil, shea butter, rosehip oil, tea seed oil, camellia flower oil, argan oil, safflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, cocoa butter, corn oil, peanut oil, rapeseed oil, evening primrose oil, wheat germ oil, coix seed oil, avocado oil, carrot oil, castor oil, flaxseed oil, coconut oil, and palm oil, among others. Animal fats include beef tallow, lard, mink oil, and egg yolk oil. These can be used alone or in combination. Among them, substances that are liquid at room temperature (especially 25°C) are preferred.

[0253] Among oily components other than ester oils, waxes include beeswax, candelilla wax, carnauba wax, jojoba oil, lanolin, whale wax, rice bran wax, sugarcane wax, palm wax, montan wax, cotton wax, myrica wax, insect wax, kapok wax, and shellac wax. These can be used individually or in combination. Among these, substances that are liquid at room temperature (especially 25°C) are preferred.

[0254] Among oily components other than esters, examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, hydroxystearic acid, 12-hydroxystearic acid, oleic acid, undecenoic acid, linoleic acid, ricinoleic acid, and lanolin fatty acids. These can be used individually or in combination. Among these, substances that are liquid at room temperature (especially 25°C) are preferred.

[0255] (4-2) Polymers The polymeric compound is a high molecular weight compound. The polymeric compound is preferably contained in a W / O type NIS-containing composition, rather than in a composition other than a W / O type NIS-containing composition. Furthermore, as mentioned above, since the W / O type NIS-containing composition and the ester oil-containing composition are preferably the same composition, the polymeric compound is also preferably contained in these compositions. That is, a hair cosmetic composition in a W / O type emulsion state containing a nonionic surfactant and a polymeric compound is preferred, or a hair cosmetic composition in a W / O type emulsion state containing a nonionic surfactant, ester oil, and a polymeric compound. In these compositions, the polymeric compound can more effectively exert formulation stability. The structure of polymers is not particularly limited, and they are generally organic compounds with a carbon skeleton (i.e., polymers usually do not contain silicones). In addition, their molecular weight is not particularly limited, and it is usually above 10,000.

[0256] Polymer compounds can be broadly classified into oil-soluble polymers and water-soluble polymers, and hair cosmetic compositions preferably contain at least one of these. That is, it is preferred that the polymer compound contains both oil-soluble and / or water-soluble polymers.

[0257] Among polymeric compounds, oil-soluble polymeric compounds are those dissolved in the oil phase of the composition contained in a W / O type NIS (i.e., dissolved in the main component of the oil phase). Examples of oil-soluble polymeric compounds include cellulose derivatives (oil-soluble cellulose derivatives), starch derivatives (oil-soluble starch derivatives), fatty acid polyesters (oil-soluble fatty acid polyesters), ethylene polymers (oil-soluble ethylene polymers), and acrylic polymers (oil-soluble acrylic polymers). These can be used individually or in combination. Furthermore, these are preferably nonionic polymeric compounds (nonionic oil-soluble polymeric compounds).

[0258] Among the aforementioned cellulose-based derivatives, examples include cellulose ethers (oil-soluble cellulose ethers) and cellulose esters (oil-soluble cellulose esters). These can be used individually or in combination. Furthermore, as mentioned above, these are preferably non-ionic. For example, non-ionic cellulose ethers are preferred. Examples of cellulose ethers include methylcellulose, ethylcellulose, and ethylmethylcellulose. These can be used alone or in combination with two or more. Among the aforementioned starch-based derivatives, examples include starch fatty acid esters and dextrin fatty acid esters. More specifically, examples include palmitic dextrin and ethylhexanoic acid dextrin. These can be used individually or in combination. Among the aforementioned fatty acid polyesters, examples include (behenic acid / eicosanoic acid) glycerides, behenic acid glycerides, and eicosanoic acid glycerides. These can be used alone or in combination with two or more. From the perspective of good oil-phase solubility, ethyl cellulose is preferred.

[0259] Among polymeric compounds, water-soluble polymeric compounds are those dissolved in the aqueous phase of the composition contained in a W / O type NIS (i.e., dissolved in water). Examples of water-soluble polymeric compounds include cellulose derivatives (water-soluble cellulose derivatives), ethylene polymers (water-soluble ethylene polymers), acrylic polymers (water-soluble acrylic polymers), and glucose derivatives (cyclodextrin, starch), etc. These can be used individually or in combination. Furthermore, these water-soluble polymers are preferably ionic, and particularly preferably cationic.

[0260] Among the aforementioned, cellulose derivatives include cellulose ethers (water-soluble cellulose ethers) and cellulose esters (water-soluble cellulose esters). These can be used individually or in combination. Examples of cellulose ethers include carboxymethyl cellulose, carboxyethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methyl cellulose. These can be used individually or in combination. The aforementioned cellulose ether is preferably an ionic cellulose ether. The ionic cellulose ether can be any one of cationic cellulose ether, anionic cellulose ether, amphoteric cellulose ether, or nonionic cellulose ether. These can be used alone or in combination of two or more. However, in the hair cosmetic composition of the first embodiment, from the viewpoint of achieving a good feel (the feel of the hair after applying the hair cosmetic composition of the first embodiment), cationic cellulose ether (cationic water-soluble cellulose ether) is particularly preferred. Examples of cationic cellulose ethers include O-[2-hydroxy-3-(trimethylammonium)propyl]hydroxyethyl cellulose chloride (polyquaternium salt-10) and dimethyldiallylammonium hydroxyethyl cellulose chloride. Among these, O-[2-hydroxy-3-(trimethylammonium)propyl]hydroxyethyl cellulose chloride is preferred.

[0261] Other examples of water-soluble polymers containing polysaccharides other than cellulose and exhibiting cationic properties include dextran hydroxypropyltrimethylammonium chloride. Furthermore, among the aforementioned acrylic polymers, examples include polyquaternary ammonium salt-11 (vinylpyrrolidone·N,N-dimethylaminoethyl methacrylate copolymer sulfate solution). These can be used individually or in combination of two or more.

[0262] When a hair cosmetic composition contains a polymer compound, the proportion of the polymer compound is not particularly limited. However, when the total weight of the hair cosmetic composition is 100% by mass, the lower limit can be set to 0.01% by mass, further to 0.1% by mass, and even further to 0.5% by mass. On the other hand, the upper limit can be set to 5% by mass, further to 3% by mass, and even further to 2% by mass. The above-mentioned upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 5% by mass, further to 0.1 to 3% by mass, and even further to 0.5 to 2% by mass.

[0263] When a hair cosmetic composition contains a polymer compound, and further contains both oil-soluble and water-soluble polymer compounds, the ratio of the proportions of each polymer compound (oil-soluble polymer) / (water-soluble polymer) based on 100% by mass of the total hair cosmetic composition is not particularly limited. The lower limit can be set to 0.01, further to 0.1, and even further to 0.2. On the other hand, the upper limit can be set to 5, further to 3, and even further to 1. The above upper and lower limits can be combined. For example, they can be set to 0.01 to 5, further to 0.1 to 3, and even further to 0.2 to 1.

[0264] (4-3) Oxidizing agent The oxidizing agent is the component that exerts the oxidizing effect. The oxidizing agent is preferably included in the W / O type NIS-containing composition, rather than in a composition other than the W / O type NIS-containing composition. Furthermore, as mentioned above, since the W / O type NIS-containing composition and the ester oil-containing composition are preferably the same composition, the oxidizing agent is also preferably included in these compositions. That is, a hair cosmetic composition in a W / O type emulsion state containing a nonionic surfactant and an oxidizing agent is preferred, or a hair cosmetic composition in a W / O type emulsion state containing a nonionic surfactant, an ester oil, and an oxidizing agent.

[0265] The oxidizing effect of an oxidizing agent is typically achieved by mixing it with another hair cosmetic composition (another agent) that differs from the hair cosmetic composition containing the oxidizing agent. For example, the hair cosmetic of the first type may be a two-component hair cosmetic comprising a first agent (a first hair cosmetic composition) and a second agent (a second hair cosmetic composition). Furthermore, in this case, the first agent may suitably contain an alkaline agent, and the second agent may suitably contain an oxidizing agent. Preferably, the oxidizing agent is contained in the second agent but not in the first agent. Furthermore, the oxidizing effect of the oxidizing agent is achieved by mixing these first and second agents.

[0266] Oxidizing agents are not particularly limited in type, as long as they can perform oxidative action; for example, peroxide-based oxidizing agents can be listed. Peroxide-based oxidizing agents are compounds having the structure shown as "-OO-". This structure is contained as a peroxide ion (O2²⁻) in inorganic compounds and as a peroxide structure (-OO-) or a percarboxylic acid structure (-CO-OO-) in organic compounds. These can be used alone or in combination. Among these, inorganic compounds are preferred, and hydrogen peroxide is more preferred among the inorganic compounds described later.

[0267] Among the above, inorganic compounds in peroxide-based oxidants can include peroxides such as hydrogen peroxide (which can also be used as inclusion compounds or adducts of hydrogen peroxide, such as urea peroxide, melamine peroxide, hydrogen peroxide adducts of phosphates, hydrogen peroxide adducts of pyrophosphates, etc.); peroxide salts (alkali metal salts such as potassium and sodium salts, alkaline earth metal salts such as magnesium, calcium, strontium, and barium salts, and zinc salts); percarbonates (alkali metal salts such as potassium and sodium salts); perborates (alkali metal salts such as potassium and sodium salts); permanganates (alkali metal salts such as potassium and sodium salts, alkaline earth metal salts such as magnesium, calcium, strontium, and barium salts), etc. These can be used individually or in combination.

[0268] In addition, organic compounds in peroxide-based oxidants include percarboxylic acids such as performic acid, peracetic acid, and perbenzoic acid, as well as their salts. Salts of percarboxylic acids include alkali metal salts such as potassium and sodium salts. These can be used individually or in combination. Furthermore, non-peroxide oxidants (i.e., compounds that do not have the structure shown by "-OO-") can be listed as bromates (alkali metal salts such as potassium and sodium salts). These can be used alone or in combination with two or more.

[0269] When a hair cosmetic composition contains an oxidizing agent, the proportion of the oxidizing agent is not particularly limited. However, when the total weight of the hair cosmetic composition is 100% by mass, the lower limit can be set to 0.1% by mass, further to 2% by mass, and even further to 3% by mass. On the other hand, the upper limit can be set to 30% by mass, further to 20% by mass, and even further to 15% by mass. The above-mentioned upper and lower limits can be combined separately. That is, for example, it can be set to 0.1% to 30% by mass, further to 2% to 20% by mass, and even further to 3% to 15% by mass.

[0270] Furthermore, the hair cosmetic composition containing an oxidizing agent (oxidizing agent-containing composition) can be used directly at this concentration, or it can be mixed with other hair cosmetic compositions constituting multi-form hair cosmetics. That is, the oxidizing agent-containing composition can be used as a mixture with other hair cosmetic compositions. When used as a mixture, the proportion of the oxidizing agent in the mixture is not particularly limited. That is, the proportion of the oxidizing agent when used is not particularly limited, but when the total mass of the mixture is 100%, its lower limit can be set to 0.05% by mass, further to 1% by mass, and further to 2% by mass. On the other hand, its upper limit can be set to 15% by mass, further to 10% by mass, and further to 7.5% by mass. The above upper and lower limits can be combined separately. That is, for example, it can be set to 0.05 to 15% by mass, further to 1 to 10% by mass, and further to 2 to 7.5% by mass.

[0271] (4-4) Stabilizer Stabilizers can improve the stability of oxidants. Stabilizers may be included in any of the multiple hair cosmetic compositions constituting the hair cosmetic of the first embodiment, but for the purposes described above, it is preferable to include them together with the oxidant. Examples of stabilizers include phenoxyethanol (ethylene glycol phenyl ether), salicylic acid, salicylates, hydroxyethylphosphonic acid, hydroxyethylphosphonate, stannic acid, and stannates. The cations constituting the salts may include alkali metal ions and ammonium ions. These can be used individually or in combination. From the viewpoint of minimizing the impact on formulation stability, phenoxyethanol and / or salicylic acid are preferred.

[0272] When a hair cosmetic composition contains a stabilizer, the proportion of the stabilizer is not particularly limited. However, when the total weight of the hair cosmetic composition is 100% by mass, the lower limit can be set to 0.01% by mass, further to 0.1% by mass, and even further to 0.2% by mass. On the other hand, the upper limit can be set to 10% by mass, further to 5% by mass, and even further to 3% by mass. The above-mentioned upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 10% by mass, further to 0.1 to 5% by mass, and even further to 0.2 to 3% by mass.

[0273] (4-5) pH adjuster As a pH adjuster, it can be used with acids and / or bases. As acids, examples include inorganic acids and their salts, and organic acids and their salts. Examples of inorganic acids include phosphoric acid, hydrochloric acid, sulfuric acid, and boric acid. Their salts include alkali metal salts and ammonium salts. These can be used alone or in combination with two or more. Examples of organic acids include tartaric acid, citric acid, lactic acid, malic acid, succinic acid, fumaric acid, maleic acid, pyrophosphate, gluconic acid, levulinic acid, glycolic acid, glucuronic acid, benzoic acid, and pyrrolidone carboxylic acid (PCA). Their salts include alkali metal salts and ammonium salts. These can be used individually or in combination of two or more.

[0274] As bases, examples include organic bases, inorganic bases, and their salts. Examples of organic bases include organic amines, basic amino acids and their salts, guanidines and their salts, etc. These can be used alone or in combination of two or more. Examples of inorganic bases include hydroxides, chlorides, silicates, carbonates, bicarbonates, metasilicates, phosphates, sulfates, and ammonia. These can be used individually or in combination with two or more.

[0275] (4-6) Preservatives Examples of preservatives include phenoxyethanol, methylparaben, ethylparaben, propylparaben, isopropylparaben, butylparaben, isobutylparaben, and sodium benzoate. These can be used individually or in combination.

[0276] (4-7) Antioxidants Examples of antioxidants include ascorbic acid (L-ascorbic acid) and anhydrous sodium sulfite. These can be used individually or in combination.

[0277] (4-8) Other ingredients The hair cosmetic composition constituting the first embodiment may contain, in addition to the aforementioned nonionic surfactants, ester oils, oily components other than ester oils, polymers, oxidants, stabilizers, pH adjusters, preservatives, and antioxidants, other ingredients. Other ingredients may include dispersants, protein derivatives and amino acids, sugars (maltose, trehalose, N-acetylglucosamine, etc.), buffers (sodium phosphate, etc.), chelating agents (ethylenediaminetetraacetic acid and its salts, diethylenetriaminepentaacetic acid and its salts, hydroxyethylphosphonic acid and its salts, etc.), plant extracts, herbal extracts, vitamins, pigments, fragrances, ultraviolet absorbers, and at least one ingredient selected from those listed in the *Standards for Quasi-Pharmaceutical Raw Materials* (revised March 2021, Pharmaceutical Daily). These ingredients may be used alone or in combination of two or more.

[0278] (5) Dosage form, properties and packaging materials The first type of hair cosmetic, composed of the various ingredients described above, is specifically suitable for use as an oxidative hair dye, bleaching agent, dye removal agent, bleaching and dye removal agent (containing oxidizing agents), shampoo, conditioner, conditioning agent, hair care product, or cleanser, etc. The dosage form (dosage form at 25°C) of the hair cosmetic of the first embodiment and the hair cosmetic composition constituting the hair cosmetic of the first embodiment is not particularly limited, and may be, for example, cream, paste, liquid, gel, foam, etc. Its properties are not particularly limited, and its specific viscosity is also not particularly limited, for example, it may be from 1 to 300,000 mPa·s. It can be particularly adjusted to a viscous liquid state, that is, for example, from 500 to 300,000 mPa·s. The lower limit of this viscosity may be set to 500 mPa·s, 1000 mPa·s, or 5000 mPa·s. On the other hand, the upper limit of the viscosity may be set to 250,000 mPa·s, 225,000 mPa·s, or 200,000 mPa·s. The above upper and lower limits can be combined separately. For example, the viscosity can be set to 500 to 250,000 mPa·s, 1,000 to 225,000 mPa·s, or 5,000 to 200,000 mPa·s. Furthermore, the viscosity values ​​mentioned above are measured using a Type B viscometer at 25°C. The packaging material for containing the hair cosmetic composition constituting the first embodiment is not particularly limited, and can be a tubular packaging material, a pump packaging material, a bottle packaging material, a two-can packaging material, an applicator, a pouch, etc. Among these, a tubular packaging material is preferred for containing a hair cosmetic composition containing the aforementioned oxidant, particularly a W / O type NIS-containing composition containing an oxidant. Furthermore, from the viewpoint of formulation stability, a tubular packaging material with an aluminum inner surface is more preferred. On the other hand, when the hair cosmetic composition is a hair care product, a pump packaging material or a bottle packaging material is preferred. From the viewpoint of ease of use, a pump packaging material is preferred.

[0279] (6) Application of hair cosmetics of the first method The hair cosmetic of the first method can be applied to hair in any way. For example, tools such as combs, brushes, and spatulas can be used to apply the hair cosmetic of the first method to the hair. Among these, from the point of view of application, it is preferred to use a comb to apply it to the hair. At this time, there is no particular limitation on the specific shape of the comb used; for example, a comb can be used. Figure 1 The comb shown is of a specific shape. Furthermore, the material of the comb is not particularly limited; a resin comb or a polypropylene comb can be used. While the aforementioned hair cosmetic achieves easy application by using a comb, existing hair cosmetics using resin combs suffer from the problem of being difficult to rinse off. In this respect, the hair cosmetic of the first method excels in solving this problem due to its improved rinsing performance.

[0280] When applying hair cosmetics to hair, the user can also apply them by hand. Furthermore, they can be applied through methods such as dipping, spreading, and penetration. These can be used alone or in combination. In addition, hair cosmetics can be applied to hair that is wet with water or warm water, as well as to dry hair.

[0281] In addition, the hair suitable for use with hair cosmetics includes hair from various parts of the body, such as scalp, beard, eyebrows, and body hair. Furthermore, there are no particular limitations on the types of biological hair that can be used, but human hair is preferred. Moreover, when applied to human hair, it can be used on hair of any condition and color. That is, it can be used on black hair, gray hair, bleached hair (black hair that has undergone bleaching), and already dyed hair. Furthermore, its application to dyed hair includes repairing, changing, and adding color to already dyed hair.

[0282] [2] Hair cosmetics (second type of hair cosmetics) The second aspect of this third group of inventions is a hair cosmetic in the form of an oil-water droplet emulsion, characterized by containing (A) a nonionic surfactant. That is, the second type of hair cosmetic is a single-agent hair cosmetic.

[0283] (1) Emulsified state Oil-to-water (W / O) emulsification is an emulsion state in which the oil-based components form a continuous phase and the aqueous components are dispersed within this continuous phase. In other words, it can be described as an emulsion state in which the oil-based components form the external phase and the aqueous components form the internal phase. Furthermore, the W / O emulsion state can be determined by any method. For example, if the formulation does not diffuse into the water and maintains its original form when dropped into water and stirred (lightly), then the formulation can be determined to be in a W / O emulsion state.

[0284] In contrast, oil-drop emulsification in water (hereinafter also referred to as "O / W type") is an emulsification state in which the aqueous components form a continuous phase and the oil components are dispersed within this continuous phase. That is, it can be described as an emulsification state in which the aqueous components form the external phase and the oil components form the internal phase. Furthermore, the O / W type emulsification state can be determined by any method; for example, if the formulation diffuses into the water when dropped into water and stirred (light stirring), then the formulation can be determined to be in an O / W type emulsion state.

[0285] (2) Nonionic surfactants Nonionic surfactants are nonionic surfactants. When second-method hair cosmetics contain nonionic surfactants, their rinsing performance is improved compared to those without nonionic surfactants. Furthermore, the appearance and shine of the second-method hair cosmetics themselves are enhanced.

[0286] There is no particular limitation on the type of nonionic surfactant used, and examples include ester-type nonionic surfactants, ether-type nonionic surfactants (including POE alkyl ethers as described below), alkyl glycosides, etc. These can be used alone or in combination of two or more. Among them, from the viewpoint of improving the gloss of the formulation in hair dyes and from the viewpoint of improving foaming performance in shampoos, nonionic surfactants other than POE alkyl ethers are preferred, ester-type nonionic surfactants are more preferred, and ester-type nonionic surfactants having a fatty acid backbone (i.e., having fatty acid residues) are even more preferred.

[0287] The types of ester-type and ether-type nonionic surfactants can be directly applied to the description in the hair cosmetic of the first method. Among them, from the viewpoint of being less likely to cause emulsification and improving rinsing performance, ester-type nonionic surfactants are preferred, POE sorbitan fatty acid esters are preferred, and from the viewpoint of being less likely to cause emulsification and improving rinsing performance, POE sorbitan monooleate is preferred.

[0288] The proportion of nonionic surfactants in the second-method hair cosmetic is not particularly limited, but when the total weight of the second-method hair cosmetic is 100%, the lower limit can be set to 0.01% by weight, further to 0.1% by weight, and even further to 0.3% by weight. On the other hand, the upper limit can be set to 10% by weight, further to 5% by weight, and even further to 3% by weight. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 10% by weight, further to 0.1 to 5% by weight, and even further to 0.3 to 3% by weight.

[0289] In addition, as described below, besides the nonionic surfactants mentioned above, cationic surfactants, anionic surfactants, and amphoteric surfactants may also be listed. Hair cosmetics may contain these surfactants other than nonionic surfactants, but it is generally preferable that they do not contain them substantially.

[0290] (3) Ester oil Ester oil is one of the oily components described later. When the second type of hair cosmetic contains ester oil, it can improve rinsing performance compared to the case without ester oil. The type of ester oil can be directly applied as described in the first type of hair cosmetic. Among them, substances that are liquid at room temperature (especially 25°C) are preferred, and from the viewpoint of easy rinsing, tri(2-ethylhexanoic acid) glyceryl ester and cetyl 2-ethylhexanoate are particularly preferred.

[0291] When the second-method hair cosmetic contains ester oil, based on 100% by mass of the second-method hair cosmetic, from the viewpoint of easy rinsing, its lower limit can be set to 0.01% by mass, further to 0.2% by mass, and even further to 0.5% by mass. On the other hand, from the viewpoint of formulation stability, its upper limit can be set to 15% by mass, further to 7% by mass, and even further to 3% by mass. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 15% by mass, further to 0.2 to 7% by mass, and even further to 0.5 to 3% by mass.

[0292] (4) Other ingredients The second type of hair cosmetics (single-agent hair cosmetics) may contain other ingredients besides the aforementioned nonionic surfactants and ester oils. Other ingredients may include oily components other than ester oils, polymers, oxidants, stabilizers, pH adjusters, preservatives, and antioxidants. These may be used individually or in combination.

[0293] (4-1) Oily components other than ester oils The oily components other than ester oils are preferably those included when the second-method hair cosmetic is set to a W / O emulsion state. By incorporating oily components, the formulation stability (stability of the W / O emulsion state), feel (hair feel after applying the hair cosmetic), and spreadability can be improved respectively. The types of oily components other than ester oils can be directly applied as described in the first-method hair cosmetic. Among these, higher alcohols and silicones are preferred. When the second-method hair cosmetic contains higher alcohols and / or silicones, compared to cases without these components, the formulation stability and feel (hair feel after applying the hair cosmetic composition) are improved.

[0294] When the second-method hair cosmetic contains oily components other than ester oils, there is no particular limitation on the proportion of these components. However, when the total weight of the second-method hair cosmetic is 100%, the lower limit can be set at 5% by weight, further at 10% by weight, and even further at 15% by weight. On the other hand, the upper limit can be set at 50% by weight, further at 40% by weight, and even further at 30% by weight. The above upper and lower limits can be combined. That is, for example, they can be set from 5% to 50% by weight, further at 10% to 40% by weight, and even further at 15% to 30% by weight.

[0295] Among the oily components other than ester oils, the types of higher alcohols can be directly applied as described in the hair cosmetic of the first method. Among them, substances that are liquid at room temperature (especially 25°C) are preferred, isostearyl alcohol and / or 2-octyldodecyl alcohol are preferred, and isostearyl alcohol and 2-octyldodecyl alcohol are even more preferred.

[0296] When the second-method hair cosmetic contains higher alcohols, there is no particular limitation on the proportion of higher alcohols. However, when the total weight of the second-method hair cosmetic is 100%, the lower limit can be set at 3% by weight, further at 8% by weight, and even further at 12% by weight. On the other hand, the upper limit can be set at 50% by weight, further at 40% by weight, and even further at 30% by weight. The above upper and lower limits can be combined. That is, for example, it can be set at 3 to 50% by weight, further at 8 to 40% by weight, and even further at 12 to 30% by weight.

[0297] Among the oily components other than ester oils, the types of silicones can be directly applied as described in the hair cosmetic of the first method. Among these, substances that are liquid at room temperature (especially 25°C) are preferred. Furthermore, from the viewpoint of ensuring formulation stability while improving hair feel (combing ability), methylphenyl polysiloxane is preferred.

[0298] When the second type of hair cosmetic contains silicone, there is no particular limitation on the proportion of silicone. However, when the total weight of the second type of hair cosmetic is 100%, the lower limit can be set to 0.1% by weight, further to 1% by weight, and even further to 2% by weight. On the other hand, the upper limit can be set to 40% by weight, further to 20% by weight, and even further to 10% by weight. The above upper and lower limits can be combined. That is, for example, it can be set to 0.1% to 40% by weight, further to 1% to 20% by weight, and even further to 2% to 10% by weight.

[0299] For oily components other than esters, the types of hydrocarbons, oils, waxes, and higher fatty acids can be directly applied as described in the first type of hair cosmetic. Among these, substances that are liquid at room temperature (especially 25°C) are preferred.

[0300] (4-2) Polymers Polymers are compounds with high molecular weights. The presence of polymers can enhance the stability of formulations. The structure of polymers is not particularly limited, but they are typically organic compounds with a carbon skeleton (i.e., polymers generally do not contain silicones). Furthermore, their molecular weight is not particularly limited, but is typically above 10,000.

[0301] Polymer compounds can be broadly classified into oil-soluble polymers and water-soluble polymers, and the second type of hair cosmetic preferably contains at least one of these. That is, the polymer compound preferably contains both oil-soluble and / or water-soluble polymers.

[0302] Among polymeric compounds, oil-soluble polymeric compounds are those dissolved in the oil phase of the second type of hair cosmetic (i.e., dissolved in the main component of the oil phase). Examples of oil-soluble polymeric compounds include cellulose derivatives (oil-soluble cellulose derivatives), starch derivatives (oil-soluble starch derivatives), fatty acid polyesters (oil-soluble fatty acid polyesters), ethylene polymers (oil-soluble ethylene polymers), and acrylic polymers (oil-soluble acrylic polymers). These can be used individually or in combination. Furthermore, nonionic polymeric compounds (nonionic oil-soluble polymeric compounds) are preferred. The types of cellulose derivatives can be directly applied to those described in the first method of hair cosmetics. From the viewpoint of good oil-phase solubility, ethyl cellulose is preferred.

[0303] Among the polymeric compounds, water-soluble polymeric compounds are those dissolved in the aqueous phase of the second type of hair cosmetic (i.e., dissolved in water). Examples of water-soluble polymeric compounds include cellulose derivatives (water-soluble cellulose derivatives), ethylene polymers (water-soluble ethylene polymers), acrylic polymers (water-soluble acrylic polymers), and glucose derivatives (cyclodextrin, starch), etc. These can be used individually or in combination of two or more. Furthermore, these water-soluble polymers are preferably ionic, and particularly preferably cationic.

[0304] The types of cellulose derivatives can be directly applied to those described in the first method of hair cosmetics. Preferably, it is O-[2-hydroxy-3-(trimethylammonium)propyl]hydroxyethyl cellulose. Furthermore, the types of water-soluble polymers that contain polysaccharides other than cellulose and are cationic can be directly applied to the content described in the first type of hair cosmetic.

[0305] When the second type of hair cosmetic contains a polymer compound, there is no particular limitation on the proportion of the polymer compound. However, when the total weight of the second type of hair cosmetic is 100% by mass, the lower limit can be set to 0.01% by mass, further to 0.1% by mass, and even further to 0.5% by mass. On the other hand, the upper limit can be set to 5% by mass, further to 3% by mass, and even further to 2% by mass. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 5% by mass, further to 0.1 to 3% by mass, and even further to 0.5 to 2% by mass.

[0306] When the second type of hair cosmetic contains polymeric compounds, and further contains both oil-soluble and water-soluble polymeric compounds, the ratio of the proportions of each polymeric compound (oil-soluble polymeric compound) / (water-soluble polymeric compound) based on 100% by mass of the entire second type of hair cosmetic is not particularly limited. Its lower limit can be set to 0.01, further to 0.1, and even further to 0.2. On the other hand, its upper limit can be set to 5, further to 3, and even further to 1. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 5, further to 0.1 to 3, and even further to 0.2 to 1.

[0307] (4-3) Oxidizing agent Oxidizing agents are components that exert an oxidizing effect. Any oxidizing agent that can perform an oxidizing effect is acceptable; there are no particular limitations on its type, and it can be directly applied as described in the first method of hair cosmetics. When the second-method hair cosmetic contains an oxidizing agent, there is no particular limitation on the proportion of the oxidizing agent. However, when the total weight of the second-method hair cosmetic is 100%, the lower limit can be set to 0.1% by weight, further to 2% by weight, and even further to 3% by weight. On the other hand, the upper limit can be set to 30% by weight, further to 20% by weight, and even further to 15% by weight. The above upper and lower limits can be combined. That is, for example, it can be set to 0.1% to 30% by weight, further to 2% to 20% by weight, and even further to 3% to 15% by weight.

[0308] (4-4) Stabilizer Stabilizers can improve the stability of oxidants. The types of stabilizers can be directly applied as described in the first method hair cosmetic. From the viewpoint of minimizing the impact on formulation stability, phenoxyethanol and / or salicylic acid are preferred.

[0309] When the second-method hair cosmetic contains a stabilizer, there is no particular limitation on the proportion of the stabilizer. However, when the total weight of the second-method hair cosmetic is 100%, the lower limit can be set to 0.01% by weight, further to 0.1% by weight, and even further to 0.2% by weight. On the other hand, the upper limit can be set to 10% by weight, further to 5% by weight, and even further to 3% by weight. The above upper and lower limits can be combined. That is, for example, it can be set to 0.01 to 10% by weight, further to 0.1 to 5% by weight, and even further to 0.2 to 3% by weight.

[0310] (4-5) pH adjuster As a pH adjuster, acids and / or bases may be used. The types of pH adjusters are directly applicable to the descriptions in the first-method hair cosmetics.

[0311] (4-6) Preservatives Examples of preservatives include phenoxyethanol, methylparaben, ethylparaben, propylparaben, isopropylparaben, butylparaben, isobutylparaben, and sodium benzoate. These can be used individually or in combination.

[0312] (4-7) Antioxidants Examples of antioxidants include ascorbic acid (L-ascorbic acid) and anhydrous sodium sulfite. These can be used individually or in combination.

[0313] (4-8) Other components In addition to the aforementioned nonionic surfactants, ester oils, oily components other than ester oils, polymers, oxidants, stabilizers, pH adjusters, preservatives, and antioxidants, hair cosmetics of the second type may also contain other ingredients. Other ingredients may include: dispersants, protein derivatives and amino acids, sugars (maltose, trehalose, N-acetylglucosamine, etc.), buffers (sodium phosphate, etc.), chelating agents (ethylenediaminetetraacetic acid and its salts, diethylenetriaminepentaacetic acid and its salts, hydroxyethylphosphonic acid and its salts, etc.), plant extracts, herbal extracts, vitamins, pigments, fragrances, ultraviolet absorbers, and at least one ingredient selected from those listed in the *Standards for Quasi-Pharmaceutical Raw Materials* (revised March 2021, Pharmaceutical Daily). These ingredients may be used individually or in combination.

[0314] (5) Dosage form, properties and packaging materials As mentioned earlier, the second type of hair cosmetics can be specifically used as oxidative hair dyes, bleaching agents, de-dyeing agents, bleaching and de-dyeing agents (preparations containing oxidants), shampoos, conditioners, conditioning agents, hair care products, or cleansers, etc. The dosage form (at 25°C) of the second type of hair cosmetic is not limited, and can be, for example, cream, paste, liquid, gel, foam, etc. Its properties are not limited, nor is its specific viscosity; for example, it can be from 1 to 300,000 mPa·s. It can be specifically adjusted to a viscous liquid state, i.e., from 500 to 300,000 mPa·s. The lower limit of this viscosity can be set to 500 mPa·s, 1000 mPa·s, or 5000 mPa·s. On the other hand, the upper limit of the viscosity can be set to 250,000 mPa·s, 225,000 mPa·s, or 200,000 mPa·s. The above upper and lower limits can be arbitrarily combined. That is, for example, it can be set to 500 to 250,000 mPa·s, 1000 to 225,000 mPa·s, or 5000 to 200,000 mPa·s. In addition, the viscosity mentioned above was measured using a Type B viscometer at 25°C. The packaging material for the hair cosmetic of the second type is not limited and can be a tubular packaging material, a pump packaging material, a bottle packaging material, a two-can packaging material, an applicator, a pouch, etc. Among these, a tubular packaging material is preferred for packaging the hair cosmetic of the second type containing the aforementioned oxidant; furthermore, from the viewpoint of formulation stability, a tubular packaging material with an aluminum inner surface is more preferred. On the other hand, when the hair cosmetic of the second type is a hair care product, a pump packaging material or a bottle packaging material is preferred. Among these, a pump packaging material is preferred from the viewpoint of ease of use.

[0315] (6) Application of the second type of hair cosmetics The second type of hair cosmetic can be applied to hair in any way. For example, tools such as combs, brushes, and spatulas can be used to apply the hair cosmetic to the hair. From the viewpoint of application, using a comb is preferred. In this case, the specific shape of the comb used is not limited, and the same selection can be made as with the first type of hair cosmetic. Furthermore, when applying the second type of hair cosmetic to the hair, the user can also apply it to the hair with their hands. Furthermore, it can be applied through operations such as soaking, coating, and penetration. These can be used alone or in combination. In addition, the hair cosmetic can be applied to hair that is wet with water or warm water, as well as to dry hair.

[0316] Furthermore, the hair suitable for hair cosmetics using the second method includes hair from various parts of the body, such as head hair, beard, eyebrows, and body hair. While there are no limitations on the types of biological hair that can be used, human hair is preferred. Moreover, when applied to human hair, it can be used on hair of any condition and color. For example, it can be used on black hair, gray hair, bleached hair (black hair that has undergone bleaching), and already dyed hair. Additionally, its application to dyed hair includes repairing, altering, or adding color to already dyed hair.

[0317] [3] Hair cosmetics (third-party hair cosmetics) The third type of hair cosmetic in this third group of invention is a hair cosmetic for coating hair with a hair composition in an oil-water droplet emulsion state, and / or coating hair with a mixture of a hair cosmetic composition in an oil-water droplet emulsion state and a hair cosmetic composition in an oil-water droplet emulsion state, characterized in that it contains (A) a nonionic surfactant.

[0318] The hair cosmetic of the second type mentioned above is in an oil-water droplet emulsion state, while the emulsion state of the hair cosmetic of the third type is not limited. That is, the third-party hair cosmetic can be W / O type (oil-water droplet type) or O / W type (water-oil droplet type). The details of each emulsion state are the same as those described in the hair cosmetic compositions of the first and second types.

[0319] Furthermore, hair-use compositions that are in an oil-in-water droplet emulsion state are included without limitation as long as they are in an oil-in-water droplet emulsion state and are suitable for hair. Specifically, examples include: (1) the hair cosmetic of the first type mentioned above; (2) hair-use compositions that are the same as the hair cosmetic of the first type except that they do not contain nonionic surfactants; (3) the first agent in preparations such as oxidative hair dyes, bleaching agents, desaturating agents, and decolorizing and desaturating agents that are in a W / O (oil-in-water droplet) emulsion state.

[0320] The descriptions of nonionic surfactants in third-party hair cosmetic compositions also apply to the descriptions of nonionic surfactants in the first and second types of hair cosmetics. The proportion of nonionic surfactants in the third-type hair cosmetic is not limited, but when the total content of the third-type hair cosmetic is 100% by mass, its lower limit can be set to 0.1% by mass, then to 1% by mass, and then to 2.5% by mass. On the other hand, its upper limit can be set to 15% by mass, then to 10% by mass, and then to 5% by mass. The above upper and lower limits can be combined arbitrarily. That is, for example, it can be set to 0.1 to 15% by mass, then to 1 to 10% by mass, and then to 2.5 to 5% by mass.

[0321] In addition, as described below, besides the aforementioned nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants may also be included. The hair cosmetic composition of the third method may contain combinations of these surfactants other than nonionic surfactants and nonionic surfactants.

[0322] The third type of hair cosmetic is similar to the first and second types, except that it may contain other ingredients besides ionic surfactants. Other ingredients may include: ester oils, oily components other than ester oils, polymers, oxidants, stabilizers, pH adjusters, preservatives, antioxidants, dispersants, protein derivatives and amino acids, sugars (maltose, trehalose, N-acetylglucosamine, etc.), buffers (sodium phosphate, etc.), chelating agents (ethylenediaminetetraacetic acid and its salts, diethylenetriaminepentaacetic acid and its salts, hydroxyethylphosphonic acid and its salts, etc.), plant extracts, herbal extracts, vitamins, pigments, fragrances, ultraviolet absorbers, and at least one ingredient selected from those listed in the *Standards for Quasi-Pharmaceutical Raw Materials* (revised March 2021, Pharmaceutical Daily). The selection and proportions of these ingredients are the same as those described in the first and second types of hair cosmetics; one ingredient may be used alone, or two or more may be used in combination.

[0323] The third type of hair cosmetic can be specifically used as a shampoo, conditioner, conditioning agent, hair conditioner, or cleanser. In particular, the third-party hair cosmetic is preferably a hair cosmetic composition applied to hair in which at least one of the first and second agents is an oil-in-water emulsion, such as an oxidizing hair dye, bleaching agent, desaturating agent, or bleaching and desaturating agent. It is preferably a shampoo, conditioner, conditioning agent, hair conditioner, or cleanser, and shampoo is especially preferred from the viewpoint of easy rinsing. The dosage form (dosage form at 25°C) of the third type of hair cosmetic is not limited and can be appropriately selected according to the use and purpose. For example, it can be cream, emulsion (lotion), dispersion, paste, foam, liquid, aqueous solution, gel, solid, etc.

[0324] When the hair cosmetic of the third method is in liquid form, its viscosity is not limited. The lower limit can be set to 50 mPa·s, 100 mPa·s, or 1000 mPa·s. On the other hand, the upper limit of viscosity can be set to 250,000 mPa·s, 225,000 mPa·s, or 200,000 mPa·s. These upper and lower limits can be combined arbitrarily. For example, it can be set to 500 to 250,000 mPa·s, 1,000 to 225,000 mPa·s, or 10,000 to 200,000 mPa·s. Furthermore, the above viscosity is measured using a Type B viscometer at 25°C. The packaging materials for third-party hair cosmetics are not limited and can include tubular packaging materials, pump packaging materials, bottle packaging materials, double-can packaging materials, aerosol packaging materials, non-aerosol packaging materials, extrusion foam packaging materials, applicators, pouches, etc.

[0325] Third-party hair cosmetics can be applied to hair in any way. For example, tools can be used to apply the third-party hair cosmetic to the hair, but it is usually done by the user's hands. Furthermore, it can be applied through dipping, coating, penetration, and other operations. These can be used alone or in combination. In addition, third-party hair cosmetics can be applied to hair that is wet with water or warm water, as well as to dry hair, and can also be applied to hair coated with a hair cosmetic composition in a W / O emulsion state or using a W / O emulsion state. Specifically, it can be applied to hair that has been rinsed with warm water after applying a hair cosmetic composition in a W / O emulsion state or using a W / O emulsion state.

[0326] Furthermore, the hair suitable for use in third-party hair cosmetic compositions includes hair from various parts of the body, such as head hair, beard, eyebrows, and body hair. In addition, there are no limitations on the type of biological hair that can be used, but human hair is preferred.

[0327] [3] Hair cosmetics As mentioned above, the hair composition in a W / O emulsion state can be the second agent in formulations such as oxidative hair dyes, bleaching agents, desaturating agents, and bleaching and desaturating agents. In this case, the first agent may also contain the aforementioned oily components, polymers, pH adjusters, stabilizers, preservatives, antioxidants, dispersants, protein derivatives and amino acids, sugars (maltose, trehalose, N-acetylglucosamine, etc.), buffers (sodium phosphate, etc.), chelating agents (ethylenediaminetetraacetic acid and its salts, diethylenetriaminepentaacetic acid and its salts, hydroxyethylphosphonic acid and its salts, etc.), plant extracts, herbal extracts, vitamins, pigments, fragrances, ultraviolet absorbers, and at least one ingredient selected from those listed in the "Standards for Quasi-Pharmaceutical Raw Materials" (revised in March 2021, Pharmaceutical Daily). These can be used alone or in combination with two or more ingredients.

[0328] In addition, the first agent may contain alkaline agents, dyes, solubilizers, surfactants, etc. These can be used alone or in combination. Among the above, the alkaline agent is a component that is alkaline in aqueous solution. This alkaline agent, by coexisting with an oxidizing agent, can decompose or alter colored components such as melanin and dyes, thereby achieving visible color fading or decolorization. That is, regardless of whether the hair is dyed, hair decolorization can be achieved by decomposing or altering the melanin contained in the hair, and dye decolorization can be achieved by decomposing or altering the dye on the dyed hair. Furthermore, the alkaline agent itself has the effect of causing hair to swell, or a hair swelling-promoting effect. Therefore, it is a component that can promote the aforementioned effects within the hair.

[0329] As alkaline agents, examples include organic bases, inorganic bases, and their salts. Among the organic bases, examples include organic amines, basic amino acids (arginine, lysine and their salts, etc.), guanidines and their salts (guanidine carbonate, etc.). Specific examples include: monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, aminomethylpropanol (2-amino-2-methyl-1-propanol, etc.), aminomethylpropanediol (2-amino-2-methyl-1,3-propanediol, etc.), and alkylamines such as monoethylamine and isopropylamine. These organic bases can be used alone or in combination with two or more.

[0330] Inorganic bases include hydroxides, chlorides, silicates, carbonates, bicarbonates, metasilicates, phosphates, sulfates, and ammonia. Specific examples include: alkali metal hydroxides such as sodium hydroxide, alkali metal carbonates such as sodium carbonate, alkali metal bicarbonates such as sodium bicarbonate, alkaline earth metal hydroxides such as magnesium hydroxide and calcium hydroxide, alkaline earth metal carbonates such as magnesium carbonate and calcium carbonate, ammonium carbonate, and ammonium bicarbonate. These inorganic bases can be used alone or in combination with two or more.

[0331] The content of the alkaline agent in the first agent is not limited, as long as it is formulated to a pH greater than 7, preferably to a pH of 8 or higher, and more preferably to a pH of 9 or higher. By formulating it to a pH greater than 7, the decolorizing effect, hair swelling effect, and hair swelling promoting effect contained with the alkaline agent can be effectively obtained. On the other hand, the upper limit of pH is not limited, and it is usually formulated to a pH of 13.5 or lower, preferably to a pH of 13 or lower, and more preferably to a pH of 12 or lower. These upper and lower limits can be combined arbitrarily. For example, the pH can be greater than 7 and less than 13.5, further to 8 to 13, and further to 9 to 12. In addition, the pH of the hair cosmetic is the pH of the mixture of the first and second agents, and is the pH at 25°C.

[0332] The proportion of the alkaline agent in the first agent is not limited. When the total content of the first agent is 100% by mass, its lower limit can be set to 0.1% by mass, 0.5% by mass, or 3% by mass. On the other hand, its upper limit can be set to 10% by mass, 15% by mass, or 17% by mass. The above upper and lower limits can be combined arbitrarily. For example, it can be set to 0.1 to 10% by mass, 0.5 to 15% by mass, or 3 to 17% by mass.

[0333] Dyes are the components that contribute to hair dyeing; previously known dyes can be used. Specific examples include oxidative dyes and direct dyes. These can be used alone or in combination. In the above, the oxidative dye is composed of at least one of a dye intermediate and a coupling agent. The dye intermediate is the component that develops color through oxidative polymerization in the presence of an oxidant. On the other hand, the coupling agent is the component that develops color through oxidative polymerization together with the dye intermediate in the presence of an oxidant, thereby obtaining a color development that cannot be obtained by oxidative polymers composed solely of dye intermediates.

[0334] Examples of dye intermediates include p-phenylenediamine, toluene-2,5-diamine (p-toluenediamine), 2,2'-[(4-aminophenyl)imino]diethanol, N-phenyl-p-phenylenediamine, 4,4'-diaminodiphenylamine, 2-hydroxyethyl-p-phenylenediamine, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, o-chloro-p-phenylenediamine, 4-amino-m-cresol, 2-amino-4-hydroxyethylaminoanisole, 2,4-diaminophenol, 1,2,4-trihydroxybenzene, o-aminophenol, p-aminophenol, and p-methylaminophenol. Furthermore, dye intermediates may include salts of the aforementioned compounds. Salts may include acid addition salts. Examples of acid addition salts include inorganic acid addition salts such as hydrochlorides and sulfates, and organic acid addition salts such as acetates. These dye intermediates and their salts may be used individually or in combination.

[0335] Examples of coupling agents include 2,4-diaminophenoxyethanol, α-naphthol, 2,6-diaminopyridine, 5-amino-o-cresol, 5-(2-hydroxyethylamino)-2-methylphenol, resorcinol, catechol, pyrogallol, gallic acid, hydroquinone, m-phenylenediamine, toluene-3,4-diamine, diphenylamine, 3,3'-iminodiphenylamine, 1,5-dihydroxynaphthalene, tannic acid, o-aminophenol, m-aminophenol, p-aminophenol, and p-methylaminophenol. Furthermore, coupling agents may include salts of the aforementioned compounds. Salts may include acid addition salts. Examples of acid addition salts include inorganic acid addition salts such as hydrochlorides and sulfates, and organic acid addition salts such as acetates. These coupling agents and their salts may be used individually or in combination.

[0336] Furthermore, of the compounds mentioned above, o-aminophenol, p-aminophenol, and p-methylaminophenol can be used as both dye intermediates and coupling agents. For example, when these compounds are used as dye intermediates, the coupling agents can be combined with other coupling agents exemplified above besides these compounds. Similarly, when these compounds are used as coupling agents, the dye intermediates can be combined with other dye intermediates exemplified above besides these compounds.

[0337] Among the aforementioned direct dyes, examples include ionic direct dyes and nonionic direct dyes. These can be used individually or in combination. As ionic direct dyes, examples include acid dyes and basic dyes. These can also be used individually or in combination. Furthermore, as nonionic direct dyes, examples include HC dyes and disperse dyes. These can also be used individually or in combination.

[0338] As acid dyes, examples include Red 2, Red 3, Red 102, Red 104, Red 105, Red 106, Red 201, Red 203, Red 220, Red 227, Red 230 (1), Red 504, Yellow 4, Yellow 5, Yellow 202 (1), Yellow 202 (2), Yellow 203, Yellow 205, Orange 207, Orange 402, Green 3, Green 204, Green 401, Blue 1, Blue 2, Blue 202, Blue 204, Blue 404, Purple 401, Brown 201, and Black 401. These can be used individually or in combination with two or more.

[0339] Examples of basic dyes include basic red, basic orange, basic yellow, basic green, basic blue, basic purple, and basic brown. These can be used individually or in combination. Furthermore, among the aforementioned, examples of basic red dyes include Basic Red 1, Basic Red 2, Basic Red 22, Basic Red 46, Basic Red 51, Basic Red 76, and Basic Red 118. Examples of basic orange dyes include Basic Orange 1, Basic Orange 2, and Basic Orange 31. Examples of basic yellow dyes include Basic Yellow 11, Basic Yellow 28, Basic Yellow 40, Basic Yellow 57, and Basic Yellow 87. Examples of basic green dyes include Basic Green 1 and Basic Green 4. Examples of basic blue dyes include Basic Blue 3, Basic Blue 6, Basic Blue 7, Basic Blue 9, Basic Blue 26, Basic Blue 41, Basic Blue 47, Basic Blue 75, Basic Blue 77, Basic Blue 99, and Basic Blue 124. Examples of basic violet dyes include Basic Violet 1, Basic Violet 2, Basic Violet 3, Basic Violet 4, Basic Violet 14, and Basic Violet 16. Examples of basic brown dyes include Basic Brown 4, Basic Brown 16, and Basic Brown 17. These can be used individually or in combination with two or more dyes.

[0340] Examples of HC dyes include HC red, HC orange, HC yellow, HC blue, and HC violet. These can be used individually or in combination. Furthermore, among the aforementioned HC red dyes, examples include HC Red 1, HC Red 3, HC Red 7, HC Red 10, HC Red 11, HC Red 13, HC Red 14, HC Red 17, HC Red 18, HC Red 19, HC Red 20, and HC Red 21. Examples of HC orange dyes include HC Orange 1, HC Orange 2, HC Orange 3, HC Orange 6, and HC Orange 7. Examples of HC yellow dyes include HC Yellow 2, HC Yellow 4, HC Yellow 5, HC Yellow 7, HC Yellow 9, HC Yellow 11, HC Yellow 13, HC Yellow 16, HC Yellow 18, HC Yellow 6, HC Yellow 10, HC Yellow 12, HC Yellow 14, HC Yellow 15, and HC Yellow 19. Examples of HC blue dyes include HC Blue 2, HC Blue 5, HC Blue 6, HC Blue 8, HC Blue 9, HC Blue 10, HC Blue 11, HC Blue 12, HC Blue 13, HC Blue 14, HC Blue 15, HC Blue 16, HC Blue 18, HC Blue 19, and HC Blue 20. Examples of HC violet dyes include HC Violet 1, HC Violet 2, HC Violet 3, and HC Violet 4. These can be used individually or in combination.

[0341] Examples of disperse dyes include Disperse Black 9, Disperse Blue 1, Disperse Blue 3, Disperse Blue 7, Disperse Brown 4, Disperse Orange 3, Disperse Red 11, Disperse Red 15, Disperse Red 17, Disperse Violet 1, Disperse Violet 4, and Disperse Violet 15. These can be used individually or in combination with two or more.

[0342] In addition, examples include nitro dyes such as 4-nitro-o-phenylenediamine, 2-nitro-p-phenylenediamine, 2-amino-4-nitrophenol, 2-amino-5-nitrophenol, picric acid, and their salts; carotenoid pigments; anthraquinone pigments; flavonoid pigments (anthocyanin pigments, chalcone pigments, flavonoid pigments); polyphenol pigments; diketone pigments; betalain pigments; and azophenone pigments. Specific examples include madder pigment, extracted carotene, cochineal pigment, shellac pigment, purple cabbage pigment, perilla pigment, purple corn pigment, elderberry pigment, boysenberry pigment, grape peel pigment, grape juice pigment, purple sweet potato pigment, safflower yellow pigment, safflower red pigment, sorghum pigment, onion pigment, cocoa pigment, sandalwood pigment, spirulina blue pigment, chlorophyll, beet red, red yeast rice pigment, indigo, gardenia pigment, curcumin yellow pigment, annatto orange pigment, sodium copper chlorophyll, pepper pigment, shellac pigment, henna, rutin, safflower, and other natural dyes. These can be used individually or in combination with two or more.

[0343] The proportion of dye is not limited, but when the total amount of the first agent is 100% by mass, the lower limit is preferably 0.001% by mass. By setting it to 0.001% by mass or more, the hair dyeing effect can be effectively obtained, and the color tone can be improved. Furthermore, the lower limit can be set to 0.1% by mass, and further to 0.5% by mass. On the other hand, the upper limit can be set to 15% by mass, 10% by mass, or 6% by mass. These upper and lower limits can be combined arbitrarily. For example, it can be set to 0.001 to 15% by mass, 0.1 to 10% by mass, or 0.5 to 6% by mass.

[0344] A solubilizer is a component that helps to solubilize the various ingredients contained in the first agent. Examples of solubilizers include water and alcohols. These can be used alone or in combination. From the viewpoint of achieving excellent solubility, water is preferred. Furthermore, a combination of water and alcohols is more preferred.

[0345] As alcohols, examples include monohydric alcohols, polyhydric alcohols, and ether alcohols. These can be used individually or in combination of two or more.

[0346] Among monohydric alcohols, lower monohydric alcohols are preferably those with 5 or fewer carbon atoms, such as ethanol, n-propanol, and isopropanol. These can be used alone or in combination with two or more. In addition, examples of monohydric aromatic alcohols include benzyl alcohol, 2-phenylethanol, cinnamyl alcohol, phenylpropanol, 1-phenoxy-2-propanol, phenylethylene glycol, α-methylbenzyl alcohol, dimethylbenzylethanol, benzyloxyethanol, phenoxyethanol, phenoxyisopropanol, and p-anestinol. These can be used alone or in combination with two or more. Furthermore, as a monohydric alcohol with an ether bond, an ether alcohol with a total of three or more hydroxyl groups and ether bonds is preferred, specifically ethoxydiethylene glycol (diethylene glycol monoethyl ether), methoxydiethylene glycol (diethylene glycol monomethyl ether), diethylene glycol monobutyl ether, etc.

[0347] Of the above, monohydric alcohols are preferably ether alcohols, more preferably ether alcohols having a total of three or more hydroxyl groups and ether bonds, and even more preferably ethoxydiethylene glycol and / or methoxydiethylene glycol, with ethoxydiethylene glycol being particularly preferred.

[0348] The valence of the polyol is not limited and can be 6 or higher, but from the viewpoint of improving the solubility or dispersibility of the dye component, a valence of 2 to 5 is preferred. Furthermore, the number of carbon atoms in the polyol is not limited and can be 6 or higher when it is a hydrocarbon group, but from the viewpoint of improving the solubility or dispersibility of the dye component, a carbon number of 2 to 5 is preferred. Specific examples include: alkyl glycols such as ethylene glycol, propylene glycol, butanediol, and pentanediol; oxadiols such as diethanol and dipropanol; ethylene glycol; propylene glycol such as propane-1,2-diol and trimethylenediol; butylene glycol such as 1,2-butanediol, 1,3-butanediol, and 1,4-butanediol; pentanediols such as isopentylene glycol, 1,5-pentanediol, and 1,2-pentanediol; and alkyltriols such as glycerol, glycerol (1,2,3-butanetriol, 1,2,4-butanetriol, etc.), and glycerol (1,2,3-pentanetriol, 1,2,5-pentanetriol, 2,3,4-pentanetriol, etc.). These can be used individually or in combination with two or more.

[0349] Furthermore, ether alcohols having ether bonds as polyols can be exemplified by polyalkylene glycols. Polyalkylene glycols can be exemplified by polyethylene glycol. The average molecular weight (number average molecular weight) of polyethylene glycol is not limited, but is typically 100 to 5000, preferably 100 to 2500, and more preferably 100 to 2000.

[0350] Among these, from the viewpoint of improving the solubility or dispersibility of dyes, glycerin, 1,3-butanediol, propylene glycol, and polyethylene glycol are preferred, and glycerin and polyethylene glycol are even more preferred, with glycerin being the most preferred. By using these, the effect of inhibiting dye precipitation and improving hair dyeing power can be obtained. Furthermore, the smoothness of the hair cosmetic (the smoothness of the formulation) can be improved. This, in turn, improves the ease of application of the hair cosmetic to the hair. That is, it improves spreadability.

[0351] Surfactants can be categorized into cationic surfactants, anionic surfactants, amphoteric surfactants, and nonionic surfactants. They can be used alone or in combination. Surfactants can be formulated for purposes such as stabilizing dyes, oily components, etc., in a first agent, and subsequently in hair cosmetics. In the above, the types of nonionic surfactants are the same as those in the hair cosmetic composition of the first embodiment.

[0352] Cationic surfactants include alkyl quaternary ammonium salts such as monoalkyl, dialkyl, and trialkyl types, benzyl chloride-type quaternary ammonium salts, and monoalkyl ether-type quaternary ammonium salts; alkyl amine salts; fatty acid amide amine salts; ester-containing tertiary amine salts; Alcorwell-type tertiary amine salts; cyclic quaternary ammonium salts such as alkylpyridinium salts and alkyl isoquinolineium salts; and benzalkonium chloride. These can be used individually or in combination.

[0353] Among these, alkyl quaternary ammonium salts are preferred, followed by monoalkyl quaternary ammonium salts and / or dialkyl quaternary ammonium salts, with monoalkyl quaternary ammonium salts being even more preferred.

[0354] Monoalkyl quaternary ammonium salts include behenyltrimethylammonium chloride, lauryltrimethylammonium chloride, lauryltrimethylammonium bromide, alkyl(16,18)trimethylammonium chloride, cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, cetyltrimethylammonium saccharin, stearyltrimethylammonium chloride, stearyltrimethylammonium bromide, cetyltrimethylammonium saccharin, stearyltrimethylammonium saccharin, distearate dimethylammonium chloride, alkyl(28)trimethylammonium chloride, polyoxyethylene(2) oleyl methylammonium chloride, polyoxyethylene stearyl methylammonium chloride, polyoxyethylene(1) polyoxypropylene(25) diethylmethylammonium chloride, polyoxypropylene methyl diethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, dicocoyl dimethylammonium chloride, ethyl lanolin fatty acid aminopropyl ethyl dimethylammonium sulfate, behenyltrimethylammonium sulfate, hydroxyethyl cellulose dimethyl diallyl ammonium chloride, etc. These can be used individually or in combination with two or more.

[0355] Anionic surfactants include alkyl ether sulfates, polyoxyethylene alkyl ether sulfates, alkyl sulfates, alkenyl ether sulfates, alkenyl sulfates, olefin sulfonates, alkane sulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, α-sulfonyl fatty acid salts, N-acyl amino acid surfactants, phosphate mono- or diester surfactants, and sulfosuccinates. These can be used alone or in combination. Counterions of the anionic groups of these surfactants include sodium ions, potassium ions, and triethanolamine. These can also be used alone or in combination.

[0356] Specifically, examples include disodium sulfosuccinate, sodium lauryl sulfate, sodium myristyl sulfate, potassium lauryl sulfate, ammonium lauryl sulfate, triethanolamine lauryl sulfate, sodium cetyl sulfate, sodium stearyl sulfate, sodium polyoxyethylene lauryl ether sulfate, triethanolamine polyoxyethylene lauryl ether sulfate, ammonium polyoxyethylene lauryl ether sulfate, sodium polyoxyethylene stearyl ether sulfate, disodium sulfosuccinate, sodium stearoyl methyl taurate, triethanolamine dodecylbenzenesulfonate, sodium tetradecyl sulfonate, sodium lauryl phosphate, polyoxyethylene lauryl ether phosphate and its salts, N-lauroyl glutamate salts (such as sodium lauroyl glutamate), N-lauroyl methyl-β-alanine salt, N-acyl glycine salt, N-acyl glutamate salt, lauric acid as a higher fatty acid, myristic acid, and salts of these higher fatty acids. These can be used individually or in combination with two or more.

[0357] Amphoteric surfactants can be categorized into amino acid-type amphoteric surfactants and betaine-type amphoteric surfactants. Amino acid-type amphoteric surfactants include sodium N-lauroyl-N'-carboxymethyl-N'-hydroxyethyl ethylenediamine, 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazoline betaine, sodium undecylhydroxyethyl imidazoline betaine, alkyl diaminoethyl glycine hydrochloride, sodium N-cocoa fatty acid acyl-N'-carboxyethyl-N'-hydroxyethyl ethylenediamine, disodium N-cocoa fatty acid acyl-N'-carboxyethoxyethyl-N'-carboxyethyl ethylenediamine, disodium N-cocoa fatty acid acyl-N'-carboxymethoxyethyl-N'-carboxymethyl ethylenediamine, sodium lauryl diaminoethyl glycinate, and sodium palm oil fatty acid acyl-N-carboxyethyl-N-hydroxyethyl ethylenediamine, among other glycine-type amphoteric surfactants; and sodium lauryl aminopropionate, sodium lauryl aminodipropionate, and triethanolamine lauryl aminopropionate, among other aminopropionic acid-type amphoteric surfactants. These can be used individually or in combination with two or more.

[0358] Examples of betaine-type amphoteric surfactants include cocoyl betaine, lauryl dimethylaminoacetic acid betaine, myristyl dimethylaminoacetic acid betaine, stearyl dimethylaminoacetic acid betaine, stearyl dimethyl betaine sodium, cocoacid fatty acid amamidopropyl betaine, palm oil fatty acid amamidopropyl betaine, lauryl amamidopropyl betaine, ricinoleic acid amamidopropyl betaine, stearyl dihydroxyethyl betaine, and other aminoacetic acid betaine-type amphoteric surfactants; and lauryl hydroxysulfonyl betaine and other sulfobetaine-type amphoteric surfactants. These can be used alone or in combination with two or more.

[0359] When the first agent contains a surfactant, the proportion of surfactant in 100% by mass of the first agent is not limited, but its lower limit can be set to 0.01% by mass, further to 0.05% by mass, and even further to 0.1% by mass. Furthermore, its upper limit can be set to 15% by mass, further to 10% by mass, and even further to 5% by mass. The above upper and lower limits can be combined arbitrarily. That is, for example, it can be set to 0.01 to 15% by mass, further to 0.05 to 10% by mass, and even further to 0.1 to 5% by mass.

[0360] The first agent is typically used in combination with the second agent (i.e., for example, the hair cosmetic composition of the first type described above). This mixing can be done before application to the hair or applied separately in sequence. That is, for example, the first agent and the second agent can be mixed on the hair. Furthermore, the composition can be applied to the hair using tools such as a comb, brush, or spatula. Alternatively, it can be applied to the hair by the user's hands. Furthermore, it can be applied by dipping, spreading, or penetrating. Only one of these methods can be used, or two or more can be used together. From the viewpoint of ease of application, application by a comb is particularly preferred. In addition, there is usually a concern that hair cosmetics adhering to a comb are difficult to rinse off, but this concern can be eliminated with the hair cosmetic according to the present invention. Furthermore, the composition can be applied to hair that is wet with water or warm water, or to dry hair. Example

[0361] The inventions of the first group, the second group, and the third group will be described in more detail below based on the embodiments. However, these embodiments are merely examples for the purpose of illustration, and the inventions of the first group, the second group, and the third group are not limited to these embodiments in any sense.

[0362] [1] Embodiments of the first group of inventions [1] Preparation of the second agent The second agents of Examples 1 to 21 and Comparative Example 1 were prepared by mixing the components shown below in the mass ratios shown in Tables 1-1 to 1-3.

[0363] (Table 1-1)

[0364] (Table 1-2)

[0365] (Table 1-3)

[0366] [4] Evaluation of the second dose <1> Evaluation of hydrogen peroxide stability (rust prevention) Each of the second agents of Examples 1 to 21 and Comparative Example 1 shown in Tables 1-1 to 1-3 was placed in three containers (three test groups were set up for each second agent). Next, a rectangular SUS plate was placed in the container with half of its length immersed in the second agent. Thus, three containers were obtained for each second agent and stainless steel plate (three test groups were set up for each second agent). These containers were placed in a constant temperature bath set at 30°C. Every 24 hours (1 day), each stainless steel plate was taken out, and the immersed and unimmersed parts were visually compared to evaluate whether there was rust. The results were applied to the following criteria, and the corresponding score (any one of 1 to 5) was selected. The average score of the three test groups was calculated, and the integer value obtained by rounding to one decimal place is shown in Tables 1-1 to 1-3.

[0367] 5: No rust was observed after soaking for more than 7 days; 4. Rusting is observed after soaking for more than 5 days but less than 7 days; 3: Rusting is observed after soaking for more than 3 days but less than 5 days; 2: Rusting is observed after soaking for more than 1 day but less than 3 days; 1: Rusting was observed if the soaking time was less than 1 day.

[0368] <2> Evaluation of formulation stability Weigh 20 grams of each of the second agents from Examples 1 to 21 and Comparative Example 1 shown in Tables 1-1 to 1-3 into standard bottles No. 4, install inner stoppers and caps, and seal each bottle. Then, place all bottles in a 50°C constant temperature bath for one month. After removing them from the constant temperature bath, visually confirm the state of the second agent contained in the bottles. Five professional reviewers will confirm the results, and the score closest to each reviewer's judgment will be selected according to the following evaluation criteria (1). The arithmetic mean of the scores selected by each of the five reviewers will be calculated. [Evaluation Criteria (1)] 5: No separation at all (Excellent) 4: Almost no separation (good) 3: Slight separation (qualified) 2: Significant separation is visible (slightly poor). 1: It is evident that there is a large amount of separation (poor).

[0369] The arithmetic mean obtained above is compared with the following benchmark (2), and the corresponding scores are shown in Tables 1-1 to 1-3. [Evaluation Criteria (2)] 5: Arithmetic mean of 4.7 or above (Excellent) 4: Arithmetic mean of 4.1 or higher but less than 4.7 (Good) 3: Arithmetic mean of 3.6 or higher but less than 4.1 (passing) 2: Arithmetic mean of 2.6 or higher but less than 3.6 (slightly poor) 1: The arithmetic mean is less than 2.6 points (poor).

[0370] [5] Use as an oxidative hair dye The first agent (containing an alkaline agent) of the oxidative hair dye was obtained by mixing the components shown in Tables 1-4 at the mass ratios shown in Tables 1-4. Then, the second agents of Examples 1 to 20 shown in Tables 1-1 to 1-3 were mixed with the first agent shown in Table 1-4 at a mass ratio of 1:1 to obtain a mixture (oxidative hair dye). The resulting mixture was applied to a wig (manufactured by Staafs). After 15 minutes of application, the mixture was rinsed off the wig with 40°C warm water for 30 seconds. The dyeing status of the rinsed wig was visually checked, and all examples were confirmed to have successfully dyed hair without problems.

[0371] (Table 1-4)

[0372] [6] Effects of the first set of invention embodiments Comparative Example 1, which did not contain the (A) polymer and underwent W / O emulsification, showed poor formulation stability. In contrast, the formulations of Examples 1 to 21, which contained the (A) polymer and underwent W / O emulsification, exhibited improved formulation stability. Furthermore, a comparison of Examples 1, 7, 8, 9, and 10 showed that the proportion of the (A) polymer was related to formulation stability and rust prevention effect. Overall, a decrease in the amount of (A) polymer tended to decrease formulation stability, while an increase in the amount of (A) polymer tended to decrease both rust prevention effect and formulation stability. Moreover, a comparison of Examples 1 and Examples 15 to 19 showed that the type of (A-2) water-soluble polymer was related to formulation stability. Overall, as a (A-2) water-soluble polymer, water-soluble cellulose derivatives (cationic water-soluble cellulose derivatives) exhibited superior formulation stability compared to water-soluble glucose derivatives. Furthermore, a comparison of Examples 1 to 6 showed that the proportion of the (B) oily component was related to formulation stability. Furthermore, a comparison of Examples 1 and 11 to 14 shows that the ratio of (A-1) oil-soluble polymer to (A-2) water-soluble polymer (A-2), (A-1) / (A-2), is related to formulation stability and rust prevention effect. Generally, a smaller (A-1) / (A-2) ratio tends to decrease formulation stability and rust prevention effect, while a larger (A-1) / (A-2) ratio results in excellent rust prevention effect but a tendency to decrease formulation stability. Furthermore, a comparison of Examples 1 and 20 shows that the stabilizer (C) is related to formulation stability and rust prevention effect, especially having a greater impact on rust prevention effect. Generally, the presence of a stabilizer tends to simultaneously improve formulation stability and rust prevention effect. As described above, since the rust prevention effect has been confirmed, it is believed that the consumption and instability of hydrogen peroxide contained in the W / O type second agent can be suppressed. It is also believed that this can result in improved hair dyeing properties.

[0373] [2] Embodiments of the second group of inventions [1] Preparation of the first agent Each first agent was prepared by mixing the components shown below in the mass ratios shown in Tables 2-1 to 2-3.

[0374] (Table 2-1)

[0375] (Table 2-2)

[0376] (Table 2-3)

[0377] [2] Preparation of the second agent Each second agent was prepared by mixing the components shown below in the mass ratios shown in Tables 2-4 to 2-6.

[0378] (Table 2-4)

[0379] (Table 2-5)

[0380] (Table 2-6)

[0381] [3] Evaluation of hair cosmetics <1> Evaluation of flow inhibition The first agent of Examples 1 to 15 and Comparative Example 1 shown in Tables 2-1 to 2-3 was mixed with the second agent of Example 1 shown in Table 2-4 at a mass ratio of 1:1 to obtain a mixture. Similarly, the first agent of Example 4 shown in Table 2-1 was mixed with the second agent of Examples 1 to 13 shown in Tables 2-4 to 2-6 at a mass ratio of 1:1 to obtain a mixture. The resulting mixture was applied to the surface of a wig (manufactured by Staafs, dry wig). The application amount was 80g of mixture per wig. The condition of the wig being almost non-dripping after 15 minutes of application was evaluated. The wig was evaluated by 5 professional judges, and the score closest to the judgment of each professional judge was selected according to the following evaluation criteria (1), and the arithmetic mean of the scores selected by each of the 5 professional judges was calculated.

[0382] [Evaluation Criteria (1)] 5: Excellent 4: Good 3: Qualified 2: Slightly worse 1: Poor.

[0383] The arithmetic mean obtained above is compared with the following benchmark (2), and the corresponding scores are shown in Tables 2-1 to 2-6. Furthermore, those who scored 2 points or higher are used as examples. [Evaluation Criteria (2)] 5: Arithmetic mean of 4.6 or above 4: Arithmetic mean of 3.6 or higher but less than 4.6 3: Arithmetic mean of 2.6 or higher but less than 3.6 2: Arithmetic mean of 1.6 or higher but less than 2.6 1: The arithmetic mean is less than 1.6 points.

[0384] <2> Evaluation of agglomeration inhibition Similar to <1> above, 20g each of the first agent of Examples 1 to 15 and Comparative Example 1 shown in Tables 2-1 to 2-3 and the second agent of Example 1 shown in Table 2-4 were weighed into a petri dish and mixed with a brush for 10 seconds. The lumps contained in the resulting mixture were visually evaluated. Five professional reviewers evaluated the mixture and selected the score closest to the judgment of each professional reviewer according to the evaluation criteria (3) below. The arithmetic mean of the scores selected by each of the five professional reviewers was calculated.

[0385] [Evaluation Criteria (3)] 5: No lumps were observed; the mixture was uniform. 4: Almost no lumps were observed; the mixture was generally uniform. 3: Only slight clumping was observed. 2: Clumps were observed in some locations. 1: A large number of clumps were observed.

[0386] The arithmetic mean obtained above is compared with the following benchmark (4), and the corresponding scores are shown in Tables 2-1 to 2-6. Furthermore, those who scored 2 points or higher are used as examples. [Evaluation Criteria (4)] 5: Arithmetic mean of 4.6 or above 4: Arithmetic mean of 3.6 or higher but less than 4.6 3: Arithmetic mean of 2.6 or higher but less than 3.6 2: Arithmetic mean of 1.6 or higher but less than 2.6 1: The arithmetic mean is less than 1.6 points.

[0387] <3> Evaluation of tactile sensation In the wig hair coated with the mixture described in <1> above, the wigs in which the first agent of Example 4 shown in Table 2-1 and the second agents of Examples 1 to 13 shown in Tables 2-4 to 2-6 were mixed at a mass ratio of 1:1 and coated with the mixture were washed with shampoo 20 minutes after application and allowed to air dry. The feel of the dried wigs was then evaluated. After the wigs were checked by five professional judges using their own fingers, the scores that were closest to the judgments of the five professional judges were selected according to the evaluation criteria (5) below, and the arithmetic mean of the scores selected by the five professional judges was calculated.

[0388] [Evaluation Criteria (5)] 5. Excellent balance between moisturizing and firming effects, with a wonderful feel. 4. It has a good balance between moisturizing and firming effects, and feels good to the touch. 3: The balance between moisturizing and firming sensations is slightly off, but the texture is good. 2: There is a slight imbalance between the moisturizing and firming sensations, but the texture is pleasant to the touch. 1: Poor touch.

[0389] The arithmetic mean obtained above is compared with the following benchmark (6), and the corresponding scores are shown in Tables 2-1 to 2-6. Furthermore, those who scored 2 points or higher are used as examples. [Evaluation Criteria (6)] 5: Arithmetic mean of 4.6 or above 4: Arithmetic mean of 3.6 or higher but less than 4.6 3: Arithmetic mean of 2.6 or higher but less than 3.6 2: Arithmetic mean of 1.6 or higher but less than 2.6 1: The arithmetic mean is less than 1.6 points.

[0390] [4] Effects of the second set of invention embodiments Comparing Comparative Example 1 in Table 2-3 with the other examples in Tables 2-1 to 2-3, it can be seen that a significant flow inhibition effect can be obtained when the surfactant (A1) contained in the first agent is 1.5% by mass or more. Furthermore, comparing Example 8 in Table 2-5 with the other examples in Tables 2-4 to 2-6, it can be seen that the second agent containing a higher alcohol (B2-1) can achieve a tactile improvement effect. Furthermore, comparing Example 2 in Table 2-4 with the other examples in Tables 2-4 to 2-6, it can be seen that the second agent containing silicone (B2-2) can achieve a tactile improvement effect. Moreover, comparing Examples 13 to 15 in Tables 2-3 with the other examples in Tables 2-1 to 2-3, it can be seen that compared to the case where the first agent contains only one surfactant, using two or more surfactants can achieve significant flow inhibition and agglomeration inhibition effects.

[0391] [3] Embodiments of the third group of inventions [1] Preparation of hair cosmetic compositions The hair cosmetic compositions of Examples 1 to 12 and Comparative Example 1 (the hair cosmetic compositions in the first type of hair cosmetic, equivalent to the second agent of an oxidative hair dye) were prepared by mixing the components shown in Tables 3-1 to 3-2 in the mass ratios shown in Tables 3-1 to 3-2. Furthermore, by mixing the components shown in Table 3-3 in the mass ratios shown in Table 3-3, hair cosmetics (third-method hair cosmetics, equivalent to shampoo) of Examples 13 to 17 and Comparative Example 2 were prepared.

[0392] (Table 3-1)

[0393] (Table 3-2)

[0394] (Table 3-3)

[0395] [2] Evaluation of first-method hair cosmetics (oxidative hair dye type) <1> Evaluation of flushing performance A hair cosmetic composition (equivalent to the first agent of an oxidative hair dye) was prepared by mixing the components shown in Table 3-4 at the mass ratios shown in Table 3-4. Then, the hair cosmetic compositions of Examples 1 to 12 and Comparative Example 1 shown in Tables 3-1 to 3-2 were mixed with the hair cosmetic composition shown in Table 3-4 at a mass ratio of 1:1 to obtain a mixture (hair cosmetic). The resulting mixture was applied to a wig (manufactured by Staafs) using a comb. After 15 minutes of application, the mixture was rinsed off the wig with 40°C warm water for 30 seconds. The rinsed wigs were visually and tactilely inspected to assess the presence and degree of slipperiness and stickiness caused by hair cosmetic residue. Five professional judges evaluated the wigs and selected the score closest to each judge's judgment based on the following evaluation criteria (1). The arithmetic mean of the scores selected by each of the five professional judges was then calculated.

[0396] [Evaluation Criteria (1)] 5: No slippery or sticky feeling from hair-derived cosmetics; hair-derived cosmetics have been rinsed off (Excellent). 4: Almost no slippery or sticky feeling from hair cosmetics; hair cosmetics have been rinsed off (Good). 3: There is a slight slippery or sticky feeling due to the presence of hair-derived cosmetics, but the cosmetics have been rinsed off (acceptable). 2: The product has a slippery or sticky feel due to the presence of hair-derived cosmetics, and there is slight residue after rinsing (slightly worse). 1: There is a noticeable slippery or sticky feeling from hair cosmetics, and a large amount of hair cosmetics residue remains after rinsing (poor).

[0397] The arithmetic mean obtained above is compared with the following benchmark (2), and the corresponding scores are shown in Tables 3-1 to 3-2. [Evaluation Criteria (2)] 5: Arithmetic mean of 4.7 or above (Excellent) 4: Arithmetic mean of 4.1 or higher but less than 4.7 (Good) 3: Arithmetic mean of 3.6 or higher but less than 4.1 (passing) 2: Arithmetic mean of 2.6 or higher but less than 3.6 (slightly poor) 1: The arithmetic mean is less than 2.6 points (poor).

[0398] (Table 3-4)

[0399] <2> Evaluation of formulation stability Each hair cosmetic composition of Examples 1 to 12 and Comparative Example 1 shown in Tables 3-1 to 3-2 was weighed into a No. 4 standard bottle, and the inner stopper and cap were installed and the bottles were sealed. Then, all bottles were placed in a 50°C constant temperature bath for 1 month. After being removed from the constant temperature bath, the state of the hair cosmetic compositions contained in the bottles was visually confirmed. Five professional reviewers evaluated the compositions, and the scores closest to the judgments of each professional reviewer were selected according to the evaluation criteria (3) below. The arithmetic mean of the scores selected by each of the five professional reviewers was calculated. Then, the obtained arithmetic mean was compared with the evaluation criteria (2) above, and the corresponding scores are shown in Tables 3-1 to 3-2.

[0400] [Evaluation Criteria (3)] 5: No separation at all (Excellent) 4: Almost no separation (good) 3: Slight separation (qualified) 2: Significant separation is visible (slightly poor). 1: It is evident that there is a large amount of separation (poor).

[0401] <3> Evaluation of the gloss of hair cosmetic compositions The gloss of each hair cosmetic composition (equivalent to the second agent of an oxidative hair dye) prepared in Examples 1 to 12 and Comparative Example 1 in [1] was evaluated. Five professional reviewers visually assessed the gloss of the hair cosmetic compositions under a standard light source. The score closest to each professional reviewer's judgment was selected according to the evaluation criteria (4) below, and the arithmetic mean of the scores selected by each of the five professional reviewers was calculated. The obtained arithmetic mean was then compared with the evaluation criteria (5) below, and the corresponding scores are shown in Tables 3-1 to 3-2.

[0402] [Evaluation Criteria (4)] 5: Very strong gloss (excellent) 4: High gloss (good) 3: Slightly stronger gloss (acceptable) 2: The luster is slightly weaker (poorer). 1: Weak (poor) luster.

[0403] [Evaluation Criteria (5)] 5: Arithmetic mean of 4.6 or above (Excellent) 4: Arithmetic mean of 3.6 or higher but less than 4.6 (Good) 3: Arithmetic mean score of 2.6 or higher but less than 3.6 (passing) 2: Arithmetic mean of 1.6 or higher but less than 2.6 (slightly poor) 1: The arithmetic mean is less than 1.6 points (poor).

[0404] [2] Evaluation of hair cosmetics (shampoo type) <1> Evaluation of flushing performance A hair cosmetic composition (equivalent to the first agent of an oxidative hair dye) was prepared by mixing the components shown in Table 3-4 at the mass ratios shown in Table 3-4. Furthermore, a hair cosmetic composition (equivalent to the second agent of an oxidative hair dye) was prepared by mixing the components shown in Table 3-5 at the mass ratios shown in Table 3-5. These were mixed at a mass ratio of 1:1 to obtain a mixture. 80g of the resulting mixture was applied to a wig (manufactured by Staafs) using a comb. After 15 minutes of application, the wig was washed with water, and then the hair cosmetic (shampoo type) shown in Table 3-3 was applied to rinse the mixture off the wig. The rinsing performance was evaluated according to the above [Evaluation Criteria (1)] and [Evaluation Criteria (2)], and the resulting scores are shown in Table 3-3.

[0405] (Table 3-5)

[0406] <2> Evaluation of foaming properties When evaluating the rinsing performance of <1> above, the amount of foam generated when applying hair cosmetics (shampoo type) was evaluated. The evaluation was conducted by 5 professional reviewers. The score closest to the judgment of each professional reviewer was selected according to the evaluation criteria (6) below, and the arithmetic mean of the scores selected by each of the 5 professional reviewers was calculated. Then, the obtained arithmetic mean was compared with the aforementioned evaluation criteria (5), and the corresponding scores are shown in Table 3-3.

[0407] [Evaluation Criteria (6)] 5: Produces a very large amount of foam (excellent) 4: Profuse foaming (good) 3: Slightly more foam than expected (acceptable) 2: The foaming amount is slightly less (slightly worse). 1: Low foaming volume (poor quality).

[0408] [3] Effects of the third set of invention embodiments A comparison of Examples 1, 10 to 12, and Comparative Example 1 shows that in the hair cosmetic composition in a W / O emulsion state, the rinsing performance is "2" (Comparative Example 1) when it does not contain a nonionic surfactant, while the rinsing performance is "5" (Examples 1, 10 to 12) when it contains a nonionic surfactant. This indicates that the rinsing performance is significantly improved by using a nonionic surfactant. Furthermore, the rinsing performance of Example 6 was "3" (Example 6), the rinsing performance of Example 7 was "4" (Example 7), and the rinsing performance of Example 1 was "5" (Example 1). Therefore, from the viewpoint of formulation stability, the content of nonionic surfactant in a hair cosmetic composition in a W / O emulsion state is preferably more than 0.05% by mass. Furthermore, the formulation stability of Example 9 was "3" (Example 9), and the formulation stability of Example 1 was "4" (Example 1). Therefore, from the viewpoint of formulation stability, in a hair cosmetic composition in a W / O emulsion state, the content of nonionic surfactant is preferably less than 6% by mass.

[0409] Furthermore, a comparison of Examples 1, 10, 11, and 12 shows that in the hair cosmetic composition in a W / O emulsion state, when polyoxyethylene alkyl ether is used as a nonionic surfactant, the gloss level of the hair cosmetic composition itself is "3" (Example 12), while when a nonionic surfactant other than polyoxyethylene alkyl ether is used, the gloss level of the hair cosmetic composition itself is "5" (Examples 1, 10, and 11). This indicates that by using a nonionic surfactant other than polyoxyethylene alkyl ether, the gloss level of the hair cosmetic composition itself is improved. Furthermore, a comparison between Example 1 and Example 6 shows that in the hair cosmetic composition in a W / O emulsion state, the rinsing performance is "3" when it does not contain ester oil (Example 6), while the rinsing performance is "5" when it contains ester oil (Example 1). It can be seen that the rinsing performance is improved by using ester oil.

[0410] Furthermore, the inventions of the first group, the second group, and the third group are not limited to the specific embodiments shown above, and various modifications can be made within the scope of the inventions of the first group, the second group, and the third group according to the purpose and use.

Claims

1. A second agent composition for hair cosmetics, comprising the second agent of a hair cosmetic having a first agent and a second agent, characterized in that, The second agent contains an oxidant and (A) a high molecular weight compound, and is in an oil-water droplet emulsion state.

2. The second agent composition for hair cosmetics as described in claim 1, wherein, The (A) polymeric compound comprises (A-1) an oil-soluble polymeric compound and (A-2) a water-soluble polymeric compound.

3. The second agent composition for hair cosmetics as described in claim 2, wherein, Contains (A-1) oil-soluble polymeric compound, When the total weight of the second agent composition for hair cosmetics is 100% by mass, the content of the (A-1) oil-soluble polymer compound is 0.1 to 2.0% by mass.

4. The second agent composition for hair cosmetics as described in claim 2 or 3, wherein, It contains (A-1) an oil-soluble polymer and (A-2) a water-soluble polymer. The ratio of the content of the oil-soluble polymer compound (A-1) to the content of the water-soluble polymer compound (A-2) is 0.05≦(A-1) / (A-2)≦4.

5. The second agent composition for hair cosmetics as described in claim 1, wherein, It contains (B) oily components.

6. The second agent composition for hair cosmetics as described in claim 5, wherein, The ratio of the content of the (A) polymeric compound to the content of the (B) oily component is 0.03≦(A) / (B)≦0.

15.

7. The second agent composition for hair cosmetics as described in claim 5 or 6, wherein, The oily component (B) contains (B-1) silicone.

8. The second agent composition for hair cosmetics as described in claim 1, wherein, It is stored in tubular packaging material.

9. A hair cosmetic product comprising a first agent and a second agent, characterized in that, The first agent contains an alkaline agent. The second agent is the second agent as described in claim 1.

10. The hair cosmetic product as described in claim 9, wherein, The first agent is in an oil droplet emulsion state in water.

11. The hair cosmetic as described in claim 9 or 10, wherein it is an oxidative hair dye or a bleaching and desaturating agent.

12. A hair cosmetic product, wherein a first agent and a second agent are mixed and used, characterized in that, The first agent, when its total mass is 100%, contains more than 1.5% by mass of (A1) surfactant and is in an oil droplet emulsion state in water. The second agent contains (B2) an oily component and is in an oil-water droplet emulsion state.

13. The hair cosmetic product as described in claim 12, wherein, The (B2) oily component contains (B2-1) higher alcohols.

14. The hair cosmetic product as described in claim 13, wherein, The (B2-1) higher alcohol comprises (B2-1-1) octyldodecyl alcohol and (B2-1-2) isostearyl alcohol, in a ratio of 0.2≦(B2-1-1) / (B2-1-2)≦5.

15. The hair cosmetic product as described in claim 12 or 13, wherein, When the second agent is 100% by mass, the content of the (B2) oily component is 18 to 30% by mass.

16. The hair cosmetic product as described in claim 12 or 13, wherein, The (B2) oily component contains (B2-2) silicone.

17. The hair cosmetic product as described in claim 12 or 13, wherein, The (A1) surfactant comprises two or more (A1-1) nonionic surfactants.

18. The hair cosmetic product as described in claim 17, wherein, The (A1-1) nonionic surfactant includes (A1-1-1) nonionic surfactants with an HLB of less than 10 and (A1-1-2) nonionic surfactants with an HLB of more than 10.

19. The hair cosmetic product as described in claim 18, wherein, The ratio of the content of the nonionic surfactant with HLB less than 10 in (A1-1-1) to the content of the nonionic surfactant with HLB greater than 10 in (A1-1-2) is (A1-1-1) / (A1-1-2)≦1.

20. The hair cosmetic product as described in claim 12 or 13, wherein, The (A1) surfactant comprises a polyoxyethylene alkyl ether.

21. The hair cosmetic product as described in claim 12 or 13, wherein, The first agent contains an oily component (B1). When the first agent as a whole is 100% by mass, the content of the (B1) oily component is 7% by mass or more.

22. The hair cosmetic product of claim 12 or 13, wherein the first agent and the second agent are mixed on a tray for use.

23. The hair cosmetic product as described in claim 12 or 13, wherein it is an oxidative hair dye or a bleaching and desaturating agent.

24. A multi-form hair cosmetic, comprising multiple independent hair cosmetic compositions, characterized in that, At least one of the hair cosmetic compositions is in an oil-water droplet emulsion state and contains (A) a nonionic surfactant.

25. A hair cosmetic product, which is in an oil-water droplet emulsion state, characterized in that, It contains (A) a nonionic surfactant.

26. A hair cosmetic product for coating hair with a hair cosmetic composition in an oil-water droplet emulsion state, and / or coating hair with a mixture of a hair cosmetic composition in an oil-water droplet emulsion state and a hair cosmetic composition in an oil-water droplet emulsion state, characterized in that, It contains (A) a nonionic surfactant.

27. The hair cosmetic product according to any one of claims 24 to 26, wherein, The nonionic surfactant (A) is a nonionic surfactant other than polyoxyethylene alkyl ethers.

28. The hair cosmetic product as described in claim 24 or 25, wherein, When used, the content of the nonionic surfactant (A) is 0.025 to 5% by mass.

29. The hair cosmetic product as described in claim 26, wherein it is a shampoo, conditioner, hair mask, hair treatment agent, or cleanser.

30. The hair cosmetic product as described in claim 26, wherein, When the total weight of the hair cosmetic product is 100% by mass, the content of the nonionic surfactant is 0.1 to 10% by mass.

31. The hair cosmetic product as described in claim 24, wherein, At least one of the hair cosmetic compositions contains (B) ester oil.

32. The hair cosmetic product as described in claim 24 or 25, wherein it is applied using a comb.

33. A hair cosmetic set, comprising: Multi-form hair cosmetics consisting of multiple independent hair cosmetic compositions, and The hair cosmetic product according to claim 26 is characterized in that, At least one of the hair cosmetic compositions is in an oil-water droplet emulsion state.

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