Oxidizing agent composition, bleaching and decolorizing agent, and method for bleaching and decolorizing hair

Abstract

To provide an oxidizing agent composition that can suppress heat generation both at the time of mixing preparation with an alkaline agent composition and at the time of hair application of a bleaching and decolorizing agent obtained by the mixing preparation, while exhibiting excellent hair bleaching and decolorizing performance and excellent storage stability.SOLUTION: An oxidizing agent composition for use in bleaching and decolorizing hair by mixing with an alkaline agent composition contains an alkaline agent, the oxidizing agent composition containing hydrogen peroxide, wherein the oxidizing agent composition contains, per 100 mass% of the oxidizing agent composition, 0.2 mass% or more and 2.0 mass% or less of a chelating agent (A), 0.4 mass% or more of an acid (B), and 0.1 mass% or more and 2.0 mass% or less of a metal hydroxide (C), a mass ratio ((B) / (A)) of the chelating agent (A) to the acid (B) is 10 or less, and a pH of the oxidizing agent composition at 25°C is within a range of 1.5 to 5.5.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oxidizing agent composition, a bleaching agent, and a method for bleaching and bleaching hair using the oxidizing agent composition. [Background technology]

[0002] In recent years, bright, vibrant hair colors with high tones have become popular. Generally, the higher the tone of the hair color, the stronger the bleaching and decolorizing power of the bleaching agent used. Most bleaching and bleaching agents are two-component systems, and one known example is one in which a first agent containing an alkaline agent and a second agent containing an oxidizing agent such as hydrogen peroxide are mixed at the time of use. Such bleaching and bleaching agents are highly reactive, and heat generation during mixing and preparation has been a problem. Furthermore, heat generation can lead to uneven bleaching and bleaching effects due to drying and dripping of the bleaching and bleaching agent during treatment, or excessive damage to the hair, potentially resulting in poor texture, such as poor combability, manageability, bounce, and strength. For this reason, efforts have been made to reduce heat generation.

[0003] For example, Patent Document 1 discloses a hair cosmetic composition that is composed of a first agent containing an alkali agent and specific metal ions and a liquid second agent containing hydrogen peroxide, which suppresses foaming and heat generation during mixing and preparation while maintaining bleaching and destaining power. Patent Document 2 discloses a powdered bleaching aid composition that contains an alkali agent and a specific amount of sodium chloride, which effectively suppresses foaming and heat generation during mixing and preparation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-022634 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-225354 Summary of the Invention [Problem to be solved by the invention]

[0005] The technologies of Patent Documents 1 and 2 considered suppressing heat generation during the preparation of the mixture of the first and second agents, or the first, second and third agents, but did not consider the heat generation that occurs when the resulting mixture (bleaching / decolorizing agent) is applied to hair after preparation.

[0006] The present inventors have noticed that heat is generated not only during the mixing preparation but also when the mixture (bleaching / dyeing agent) obtained by the mixing preparation is applied to hair. Through further research, the present inventors have found that even when heat generation during the mixing preparation is suppressed, significant heat is generated when the bleaching / dyeing agent mixture is applied to human hair, and that heat generation cannot be suppressed. Specifically, the hair cosmetic composition described in Patent Document 1 generates heat at 35°C or less during the mixing preparation, but can generate heat at 55°C or more when applied to human hair.

[0007] Furthermore, the bleaching and decoloring power of the hair cosmetic composition described in Patent Document 1 was not of a satisfactory quality for bleaching and decoloring performed to achieve a high-tone hair color finish. The technology of Patent Document 2 suppresses heat generation during mixing and preparation, but there is still a problem of significant heat generation when the bleaching and dyeing agent mixture is applied to hair, and the bleaching and dyeing power is not of satisfactory quality.

[0008] In view of the above, an object of the present invention is to provide an oxidizing agent composition that suppresses heat generation during preparation by mixing with an alkaline agent composition, and also suppresses heat generation when the bleaching / dyeing agent obtained by the mixing / preparation is applied to hair, thereby exhibiting excellent hair bleaching / decoloring power and excellent storage stability.

[0009] Another object of the present invention is to provide an oxidizing agent composition that can be used to prepare a bleaching / decoloring agent that is excellent in hair texture and that prevents the bleaching / decoloring agent from drying out or dripping during application. [Means for solving the problem]

[0010] As a result of extensive research into methods for solving the above problems, the present inventors have found that a specific composition can solve the above problems, and have thus completed the present invention. An example of the configuration of the present invention is as follows.

[0011] [1] An oxidizing agent composition containing hydrogen peroxide for use in bleaching and decoloring hair by mixing with an alkaline agent composition containing an alkaline agent, the oxidizing agent composition containing 0.2 to 2.0 mass% of a chelating agent (A), 0.4 mass% or more of an acid (B), and 0.1 to 2.0 mass% of a metal hydroxide (C) based on 100 mass% of the oxidizing agent composition; An oxidizing agent composition, wherein the mass ratio ((B) / (A)) of the chelating agent (A) to the acid (B) is 10 or less, and the pH of the oxidizing agent composition at 25°C is within the range of 1.5 to 5.5.

[0012] [2] The oxidizing agent composition according to [1], further comprising 1.0 to 5.0 mass % of a polyol (D). [3] The oxidizing agent composition according to [1] or [2], further comprising 0.5 to 6.0 mass % of a hydrocarbon (E) that is liquid at room temperature.

[0013] [4] The oxidizing agent composition according to any one of [1] to [3], further comprising 0.1 to 5.0 mass % of an ester (F). [5] The oxidizing agent composition according to any one of [1] to [4], wherein the chelating agent (A) is an organic phosphonic acid chelating agent.

[0014] [6] The oxidizing agent composition according to any one of [1] to [5], wherein the acid (B) is an inorganic acid. [7] The oxidizing agent composition according to any one of [1] to [6], which has a viscosity at 25°C of 5,000 to 40,000 mPa·s.

[0015] [8] A bleaching / decolorizing agent comprising a mixture of an alkaline agent composition containing an alkaline agent and the oxidizing agent composition according to any one of [1] to [7]. [9] A method for bleaching and dyeing hair, comprising: step (I) of mixing an alkaline agent composition containing an alkaline agent with the oxidizing agent composition according to any one of [1] to [7] to obtain a mixture; step (II) of applying the mixture to hair after step (I); and step (III) of allowing the mixture to act on the hair for 30 to 120 minutes after step (II). [Effects of the Invention]

[0016] According to the present invention, an oxidizing agent composition can be provided that suppresses heat generation during mixing with an alkaline agent composition and also suppresses heat generation when the resulting bleaching agent is applied to hair, thereby exhibiting excellent hair bleaching and decolorizing power and excellent storage stability.Furthermore, according to the present invention, an oxidizing agent composition can be provided that suppresses drying and dripping of the bleaching agent during application, thereby enabling the preparation of a bleaching agent that is excellent in hair texture. DETAILED DESCRIPTION OF THE INVENTION

[0017] <Oxidizing agent composition> The oxidizing agent composition of the present invention is an oxidizing agent composition containing hydrogen peroxide for use in bleaching and decoloring hair by mixing with an alkaline agent composition containing an alkaline agent, wherein the oxidizing agent composition contains, based on 100 mass %, 0.2 to 2.0 mass % of a chelating agent (A), 0.4 mass % or more of an acid (B), and 0.1 to 2.0 mass % of a metal hydroxide (C), the mass ratio of the chelating agent (A) to the acid (B) ((B) / (A)) is 10 or less, and the pH of the oxidizing agent composition at 25°C is within the range of 1.5 to 5.5.

[0018] The oxidizing agent composition of the present invention is mixed with an alkaline agent composition containing an alkaline agent and used for bleaching and decoloring hair. The oxidizing agent composition of the present invention can be used, for example, as the second agent in a two-component bleaching and dyeing agent, or as the second agent in a three-component bleaching and dyeing agent, and the formulation is not particularly limited.

[0019] <Chelating agent (A)> In the present invention, the chelating agent (A) is also referred to simply as "component (A)." The oxidizing agent composition of the present invention contains 0.2 to 2.0 mass %, preferably 0.6 to 2.0 mass %, more preferably 0.6 to 1.0 mass % of the chelating agent (A) based on 100 mass % of the oxidizing agent composition.

[0020] When the content of the chelating agent (A) is within the above range, the obtained bleaching and dyeing agent has an excellent heat-inhibiting effect when applied to hair, and the storage stability of the oxidizing agent composition is also excellent. If the content of the chelating agent (A) is less than the lower limit, heat generation when the resulting bleaching / dyeing agent is applied to hair cannot be sufficiently suppressed.If the content of the chelating agent (A) is more than the upper limit, the storage stability of the hydrogen peroxide contained in the oxidizing agent composition may deteriorate, resulting in foaming or separation of the agent.

[0021] Examples of the chelating agent (A) include organic phosphonic acid chelating agents, aminocarboxylic acid chelating agents, hydroxycarboxylic acid chelating agents, etc. Among these, from the viewpoint of suppressing heat generation when the resulting bleaching / dyeing agent is applied to hair, it is preferable that the chelating agent (A) is an organic phosphonic acid chelating agent.

[0022] Examples of organic phosphonic acid chelating agents include hydroxyethanediphosphonic acid, nitrilotrimethylenephosphonic acid, ethylenediaminetetramethylenephosphonic acid, diethylenetriaminepentamethylenephosphonic acid, and salts thereof. Specific examples of the salts include tetrasodium hydroxyethanediphosphonate and hexasodium diethylenetriaminepentamethylenephosphonate.

[0023] Among these, from the viewpoint of excellent storage stability, the chelating agent (A) is preferably hydroxyethanediphosphonic acid or a salt thereof, and more preferably hydroxyethanediphosphonic acid.

[0024] Examples of aminocarboxylic acid chelating agents include edetic acid and salts thereof, and a specific example of the salt is edetate tetrasodium. Examples of hydroxycarboxylic acid chelating agents include hydroxyethylethylenediamine and salts thereof, and a specific example of the salt is trisodium hydroxyethylethylenediaminetriacetate. The chelating agent (A) may be used alone or in combination of two or more.

[0025] <Acid (B)> In the present invention, the acid (B) is also simply referred to as "component (B)". The oxidizing agent composition of the present invention contains 0.4% by mass or more, preferably 0.7% by mass or more, and more preferably 1.0% by mass or more of the acid (B) based on 100% by mass of the oxidizing agent composition. When the content of the acid (B) is within the above range, the resulting bleaching and dyeing agent has excellent heat-inhibiting effect and bleaching and dyeing power when applied to hair, and the storage stability of the oxidizing agent composition is also excellent.

[0026] If the content of the acid (B) is less than the lower limit, heat generation when the resulting bleaching / dyeing agent is applied to hair cannot be sufficiently suppressed. The upper limit of the amount of the acid (B) is not particularly limited and is determined by the mass ratio ((B) / (A)) of the chelating agent (A) to the acid (B), which will be described later. The oxidizing agent composition of the present invention contains the acid (B) in an amount of preferably 10.0 mass% or less, more preferably 5.0 mass% or less, and even more preferably 2.0 mass% or less.

[0027] Examples of the acid (B) include inorganic acids and organic acids. Among these, inorganic acids are preferred as the acid (B) because they have an excellent heat-inhibiting effect when the resulting bleaching / dyeing agent is applied to hair.

[0028] Specific examples of inorganic acids include phosphoric acid, hydrochloric acid, nitric acid, sulfuric acid, boric acid, etc. Among these, phosphoric acid and hydrochloric acid are preferred from the viewpoint of providing an excellent hair texture, and phosphoric acid is more preferred from the viewpoint of providing a particularly excellent hair texture with the resulting bleaching / decoloring agent.

[0029] Although the reason why phosphoric acid has an excellent heat-suppressing effect when the resulting bleaching agent is applied to hair and contributes to improving hair texture is unclear, the inventors believe that when the bleaching agent is applied to hair, phosphoric acid acts as a buffer against the alkaline agent on the hair to suppress excessive decomposition of hydrogen peroxide. The inventors further speculate that the inclusion of a specific amount of phosphoric acid may reduce hair damage caused by excessive decomposition of hydrogen peroxide, thereby improving hair texture.

[0030] Examples of organic acids include tartaric acid, levulinic acid, lactic acid, glycolic acid, acetic acid, salicylic acid, glutamic acid, citric acid, ascorbic acid, etc. Among these, citric acid and lactic acid are preferred.

[0031] The acid (B) may be used alone or in combination of two or more. The oxidizing agent composition of the present invention contains 0.2 to 2.0 mass % of a chelating agent (A) and 0.4 mass % or more of an acid (B), and the mass ratio of the chelating agent (A) to the acid (B) ((B) / (A)) is 10 or less, preferably 5 or less, and more preferably 2 or less.

[0032] When the mass ratio ((B) / (A)) is 10 or less, the balance between the chelating agent (A) and the acid (B) is good, the storage stability of the oxidizing agent composition is excellent, and the bleaching and destaining power of the resulting bleaching and destaining agent is also excellent.

[0033] If the mass ratio ((B) / (A)) is greater than 10, the stability of the hydrogen peroxide contained in the oxidizing agent composition will be reduced. The lower limit of the mass ratio ((B) / (A)) is not particularly limited and is determined by the mass of the chelating agent (A) and the acid (B), but is preferably 0.6 or more, more preferably 0.8 or more, and even more preferably 1.0 or more.

[0034] <Metal hydroxide (C)> In the present invention, the metal hydroxide (C) is also referred to simply as "component (C)". The oxidizing agent composition of the present invention contains 0.1 to 2.0 mass %, preferably 0.2 to 1.0 mass %, and more preferably 0.3 to 0.6 mass % of the metal hydroxide (C) based on 100 mass % of the oxidizing agent composition.

[0035] When the content of the metal hydroxide (C) is within the above range, the resulting bleaching and dyeing agent generates less heat when applied to hair, and the bleaching and dyeing ability is excellent. In addition, the storage stability of the oxidizing agent composition is excellent.

[0036] If the content of the metal hydroxide (C) is less than the lower limit, the bleaching and dyeing power of the resulting bleaching and dyeing agent is weak.If the content of the metal hydroxide (C) is more than the upper limit, the heat generation of the resulting bleaching and dyeing agent when applied to hair cannot be suppressed, and the storage stability is poor.

[0037] Conventional techniques for suppressing heat generation have made it difficult to enhance bleaching and destaining power while suppressing heat generation. However, according to the present invention, by including specific amounts of chelating agent (A) and acid (B), heat generation during mixing and preparation and when the resulting bleaching and destaining agent is applied to hair are suppressed. Furthermore, by including a specific amount of metal hydroxide (C), the bleaching and destaining power is also excellent. Although the reason for this is unclear, the inventors speculate that the presence of specific amounts of chelating agent (A) and acid (B) may prevent the hydrogen peroxide from undergoing a rapid decomposition reaction when the hydrogen peroxide in the oxidizing agent composition reacts with the alkaline agent composition containing an alkaline agent, while the presence of a specific amount of metal hydroxide (C) moderately promotes the decomposition reaction of the hydrogen peroxide for a certain period of time.

[0038] Examples of the metal hydroxide (C) include sodium hydroxide, potassium hydroxide, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, etc. Among these, sodium hydroxide is preferred as the metal hydroxide (C) because it suppresses heat generation during mixing and preparation and heat generation when the resulting bleaching and dyeing agent is applied to hair, and it has particularly excellent bleaching and dyeing power. The metal hydroxides (C) may be used singly or in combination of two or more kinds.

[0039] <Polyol (D)> In the present invention, the polyol (D) is also referred to simply as "component (D)." The oxidizing agent composition of the present invention contains the polyol (D) in an amount of preferably 1.0 to 5.0 mass %, more preferably 2.0 to 4.0 mass %, and even more preferably 2.5 to 3.5 mass %, based on 100 mass % of the oxidizing agent composition.

[0040] It is preferable that the content of polyol (D) is within the above range, since the finished texture of hair treated with the resulting bleaching and dyeing agent is excellent and drying of the bleaching and dyeing agent during treatment can be suppressed. Examples of the polyol (D) include propylene glycol, glycerin, diglycerin, butylene glycol, and polyethylene glycol, and among these, polyethylene glycol is preferred.

[0041] Specifically, polyethylene glycol having a number average molecular weight of 200 to 1,000 is preferred, and polyethylene glycol having a number average molecular weight of 400 to 1,000 is more preferred.

[0042] It is preferable that the number average molecular weight of polyethylene glycol is within the above range, since the texture of the finished hair treated with the resulting bleaching and dyeing agent is particularly excellent, and the bleaching and dyeing agent is also excellent in preventing drying during treatment. The polyol (D) may be used singly or in combination of two or more kinds.

[0043] <Hydrocarbons that are liquid at room temperature (E)> In the present invention, the hydrocarbon (E) that is liquid at room temperature is also simply referred to as "component (E)". In the present invention, hydrocarbons that are liquid at room temperature refer to hydrocarbons that are liquid at 20 to 25°C.

[0044] The oxidizing agent composition of the present invention contains, based on 100% by mass of the oxidizing agent composition, preferably 0.5 to 6.0% by mass, more preferably 1.0 to 5.0% by mass, and even more preferably 2.0 to 4.0% by mass of a hydrocarbon (E) that is liquid at room temperature.

[0045] It is preferable that the content of the hydrocarbon (E) that is liquid at room temperature is within the above range, since the finished texture of hair treated with the resulting bleaching and dyeing agent is excellent and drying and dripping of the bleaching and dyeing agent during treatment can be suppressed.

[0046] Examples of the hydrocarbon (E) that is liquid at room temperature include α-olefin oligomer, liquid paraffin, light liquid isoparaffin, squalane, polybutene, polyisobutene, etc. Among these, light liquid isoparaffin, squalane, and liquid paraffin are preferred from the viewpoint of ease of handling. The hydrocarbons (E) that are liquid at room temperature may be used singly or in combination of two or more.

[0047] <Ester (F)> In the present invention, the ester (F) is also simply referred to as "component (F)." The oxidizing agent composition of the present invention contains the ester (F) in an amount of preferably 0.1 to 5.0 mass %, more preferably 1.0 to 4.0 mass %, and even more preferably 1.5 to 3.0 mass %, based on 100 mass % of the oxidizing agent composition.

[0048] The content of the ester (F) within the above range is preferable because the texture of the finished hair treated with the resulting bleaching agent is excellent and the drying of the bleaching agent during treatment can be suppressed.Furthermore, the content of the ester (F) within the above range is preferable because the agents can be easily mixed uniformly when mixing an alkaline agent composition containing an alkaline agent with the oxidizing agent composition of the present invention.

[0049] Examples of the ester (F) include fatty acid esters, aromatic esters, and cyclic esters, and among these, fatty acid esters are preferred.

[0050] Examples of fatty acid esters include esters of higher fatty acids and alcohols, and more specifically, esters of straight-chain or branched-chain fatty acids with lower alcohols, straight-chain higher alcohols, branched-chain higher alcohols, or polyhydric alcohols. Among these, the fatty acid esters are preferably esters of straight-chain fatty acids with lower alcohols and esters of straight-chain fatty acids with branched-chain higher alcohols, as these provide an excellent finished hair texture.

[0051] An example of an ester of a straight-chain fatty acid and a lower alcohol is isopropyl myristate, and an example of an ester of a straight-chain fatty acid and a branched-chain higher alcohol is 2-ethylhexyl palmitate.

[0052] More specific examples of fatty acid esters include octyldodecyl oleate, ethylene glycol distearate, octyldodecyl myristate, isopropyl myristate, cetyl palmitate, isopropyl palmitate, 2-ethylhexyl palmitate, isostearyl isostearate, and octyldodecyl lanolinate. Among these, it is preferable that the ester (F) is at least one selected from the group consisting of isopropyl myristate, 2-ethylhexyl palmitate, isostearyl isostearate, and octyldodecyl lanolinate. It is more preferable that the ester (F) is at least one selected from the group consisting of isopropyl myristate and 2-ethylhexyl palmitate, as this is particularly effective in preventing the bleaching agent from drying out during treatment and also provides an excellent finished hair texture. It is even more preferable to use isopropyl myristate and 2-ethylhexyl palmitate in combination.

[0053] When isopropyl myristate and 2-ethylhexyl palmitate are used in combination as the ester (F), the mass ratio of isopropyl myristate to 2-ethylhexyl palmitate is preferably 4:1 to 1:4, more preferably 2:1 to 1:2. A mass ratio of isopropyl myristate to 2-ethylhexyl palmitate within the above range is preferred because it facilitates mixing of the alkaline agent composition containing the alkaline agent with the oxidizing agent composition when the alkaline agent composition is in powder form. Furthermore, a mass ratio within the above range is preferred because it is particularly effective in preventing the bleaching agent from drying out during treatment. The ester (F) may be used singly or in combination of two or more kinds.

[0054] 〔hydrogen peroxide〕 The oxidizing agent composition of the present invention contains hydrogen peroxide. The content of hydrogen peroxide in the oxidizing agent composition can be appropriately set depending on the desired state of hair bleaching and decoloring, but for example, the oxidizing agent composition can contain 5.0 to 9.0% by mass of hydrogen peroxide in 100% by mass of the oxidizing agent composition.

[0055] [Alkaline agent composition] The oxidizing agent composition of the present invention is mixed with an alkaline agent composition containing an alkaline agent and used for bleaching and decoloring hair.

[0056] Examples of the alkaline agent include sulfates, persulfates, silicates, ammonia, alkanolamines, carbonates, hydrogencarbonates, metasilicates, phosphates, organic amines, basic amino acids, etc. Specific examples of the alkaline agent include potassium persulfate, ammonium persulfate, and sodium silicate.

[0057] The components and contents of the alkaline agent in the alkaline agent composition can be appropriately set depending on the desired state of bleaching and decoloring of hair, but for example, the alkaline agent composition can contain 10 to 40 mass% of ammonium persulfate and 5 to 30 mass% of potassium persulfate as alkaline agents.

[0058] The alkaline agent composition may be in the form of, for example, powder, liquid, cream, or the like. The oxidizing agent composition of the present invention can be mixed with various types of alkaline agent compositions and suitably used for bleaching and decoloring hair, but it is preferable that the alkaline agent composition be in powder form, as this provides an excellent bleaching and decoloring effect. An example of a commercially available alkaline agent composition is Arimino Bleach 120 (manufactured by Arimino Co., Ltd.).

[0059] Other ingredients The oxidizing agent composition of the present invention may contain optional components other than those described above, provided that the effects of the present invention are not impaired. Examples of optional components include pH adjusters (excluding components corresponding to the above-mentioned components (B) and (C)), surfactants, emulsifiers, viscosity adjusters, solubilizers, wetting agents, water-soluble polymers, polyhydric alcohols, sugars, plant extracts, stabilizers, humectants, herbal medicines, preservatives, antioxidants, cooling agents, antistatic agents, vitamins, proteins, fragrances, pigments, and solvents (excluding components corresponding to the above-mentioned components (E) and (F)).

[0060] Examples of pH adjusters include monoethanolamine, triethanolamine, sodium lactate, and sodium citrate, and among these, monoethanolamine and triethanolamine are preferred.

[0061] Examples of surfactants include cationic surfactants, anionic surfactants, amphoteric surfactants, and nonionic surfactants. Specific examples of surfactants include cationic surfactants such as stearyltrimethylammonium chloride, and nonionic surfactants such as polyoxyethylene (POE) cetyl ether, POE lauryl ether, POE stearyl ether, and POE behenyl ether.

[0062] Stabilizers include, for example, salicylic acid. The viscosity adjuster, emulsifier, and stabilizer are blended when the oxidizing agent composition is to be made creamy or when the viscosity is to be adjusted. As long as the effects of the present invention are not impaired, the emulsifier may include, for example, polyoxyethylene cetyl ether, and the viscosity adjuster may include, for example, cetostearyl alcohol.

[0063] The oxidizing agent composition of the present invention may contain an oxidizing agent other than hydrogen peroxide, provided that the effects of the present invention are not impaired. Examples of the oxidizing agent include urea peroxide, melamine peroxide, sodium percarbonate, sodium perborate, potassium perborate, sodium peroxide, potassium peroxide, magnesium peroxide, barium peroxide, calcium peroxide, strontium peroxide, hydrogen peroxide adducts of phosphates, and hydrogen peroxide adducts of pyrophosphates.

[0064] <Dosage form, etc.> The oxidizing agent composition of the present invention has a pH at 25°C within the range of 1.5 to 5.5, preferably 2.0 to 4.5, and more preferably 2.5 to 3.5. When the pH is within the above range, heat generation from the resulting bleaching and dyeing agent when applied to hair is suppressed, bleaching and dyeing power is excellent, and the storage stability of the hydrogen peroxide contained in the oxidizing agent composition is also excellent.

[0065] If the pH is lower than the lower limit, the bleaching and dyeing power of the resulting bleaching and dyeing agent will be significantly weakened, and the storage stability of the hydrogen peroxide in the oxidizing agent composition will also be impaired.If the pH is higher than the upper limit, the heat generated by the resulting bleaching and dyeing agent when applied to hair will not be suppressed, and the storage stability of the hydrogen peroxide contained in the oxidizing agent composition will also be impaired. The pH can be measured in an environment at a temperature of 25°C using, for example, a pH meter (F-71, manufactured by Horiba Ltd.).

[0066] The oxidizing agent composition of the present invention may be in the form of, for example, a liquid, a cream, or a gel. Of these, the cream form is preferred from the viewpoint of ease of application to hair.

[0067] The oxidizing agent composition of the present invention preferably has a viscosity at 25°C of 5,000 to 40,000 mPa·s, more preferably 10,000 to 35,000 mPa·s, and even more preferably 15,000 to 30,000 mPa·s, so that the resulting bleaching agent can be easily applied to hair.

[0068] The viscosity can be measured in an environment at a temperature of 25°C using, for example, a B-type viscometer (manufactured by Brookfield).

[0069] <Bleaching and decolorizing agent> The bleaching and staining agent of the present invention is prepared by mixing an alkaline agent composition containing an alkaline agent with the above-mentioned oxidizing agent composition.

[0070] The mixing ratio of the alkaline agent composition and the oxidizing agent composition can be appropriately set depending on the desired state of bleaching and decoloring of hair, but the mass ratio when mixing the alkaline agent composition and the oxidizing agent composition (alkaline agent composition:oxidizing agent composition) is preferably 1:0.5 to 1:5. The alkaline agent composition and the oxidizing agent composition can be mixed uniformly by hand using, for example, a muddler.

[0071] <How to bleach and decolorize hair> The method for bleaching and decoloring hair of the present invention includes step (I) of mixing an alkaline agent composition containing an alkaline agent with the above-mentioned oxidizing agent composition to obtain a mixture, step (II) of applying the mixture to hair after step (I), and step (III) of allowing the mixture to act on the hair for 30 to 120 minutes after step (II).

[0072] In step (I), the mixing ratio of the alkaline agent composition and the oxidizing agent composition can be appropriately set depending on the desired state of bleaching and decoloring of hair, but the mass ratio when mixing the alkaline agent composition and the oxidizing agent composition (alkaline agent composition:oxidizing agent composition) is preferably 1:0.5 to 1:5. It is preferable to carry out step (II) within 5 minutes after step (I) because this provides excellent decolorizing and destaining power.

[0073] In step (II), it is preferable to apply 7 to 9 g of the mixture per 1 g of hair, as this provides excellent bleaching and destaining power. In step (II), the method for applying the mixture to the hair is not particularly limited, but for example, the mixture can be scooped up with hands, a brush, or the like, and applied to the hair. The hair to which the mixture is applied may be dry or wet, but it is preferable to apply the mixture to dry hair in view of excellent bleaching and decolorizing power and reducing damage to the hair.

[0074] In step (III), it is preferable to apply the mixture to the hair for preferably 40 to 80 minutes, more preferably 50 to 70 minutes, as this provides excellent bleaching and decolorizing power and also improves the texture of the hair. After step (III), the hair is usually washed with warm water at about 40°C, washed with a shampoo and treatment agent as appropriate, and then dried with a hair dryer or the like.

[0075] [Manufacturing method] The oxidizing agent composition of the present invention can be produced by, for example, stirring, mixing, heating, dissolving, dispersing, or the like by a known method, except that the above-mentioned components are used in the above-mentioned amounts, and the production method is not particularly limited. The production method may be carried out under heated conditions to uniformly mix the components. When produced under heated conditions, the temperature may be, for example, 75 to 85°C.

[0076] [How to use, etc.] In the present invention, the mixture obtained by mixing the alkaline agent composition containing an alkaline agent with the above-mentioned oxidizing agent composition of the present invention is preferably in the form of a liquid or cream, more preferably in the form of a cream, since the mixture does not drip from the hair or a brush when applied to hair and is therefore easy to handle.

[0077] The oxidizing agent composition of the present invention has an excellent heat generation suppressing effect when applied to hair, and therefore can also be used as a heat generation suppressant for bleaching and decoloring hair, which contains 0.2 to 2.0 mass % of a chelating agent (A), 0.4 mass % or more of an acid (B), and 0.1 to 2.0 mass % of a metal hydroxide (C), wherein the mass ratio of the chelating agent (A) to the acid (B) ((B) / (A)) is 10 or less, and the pH of the oxidizing agent composition at 25°C is within the range of 1.5 to 5.5.

[0078] In a bleaching and dyeing agent, even if heat generation during mixing and preparation of a first agent containing an alkaline agent and a second agent containing an oxidizing agent such as hydrogen peroxide is suppressed, significant heat generation may not be suppressed when the mixture of bleaching and dyeing agents is applied to hair.The reason for this is unclear, but the inventors believe that this may be due to factors such as the metal components and amount contained in the hair, body temperature, and high hair density.

[0079] Even if there are individual differences in constitutions such as hair components and hair density, the heat generation inhibitor of the present invention can effectively suppress heat generation when mixed with an alkaline agent composition containing an alkaline agent and used for bleaching and decoloring hair. [Example]

[0080] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0081] <Examples 1 to 67 and Comparative Examples 1 to 9> In the examples and comparative examples, commercially available products listed in Table 1 were used. The numerical values ​​of the formulation in Table 2 represent the mass % of each component when the alkaline agent composition is taken as 100 mass %, and are expressed as values ​​converted into pure contents. In the examples and comparative examples, alkaline agent compositions were used that were produced by a conventional method according to the formulations shown in Table 2. The alkaline agent compositions were in the form of powder.

[0082] The numerical values ​​of the formulations in Tables 3 to 11 represent the mass % of each component when the oxidizing agent composition is taken as 100 mass %, and are shown as values ​​converted into pure contents. Samples of each example and comparative example were produced by a conventional method using the formulations in Tables 3 to 11. The pH of the samples at 25°C is shown in Tables 3 to 11. The pH was measured with a pH meter.

[0083] The oxidizing agent compositions produced in Examples 1 to 33 and 35 to 67 had a viscosity at 25° C. measured with a Brookfield viscometer of 5,000 to 40,000 mPa·s.

[0084] [Table 1]

[0085] [Table 2]

[0086] A 90 g mixture (bleaching / decolorizing agent) was prepared from 30 g of the alkaline agent composition shown in Table 2 and 60 g of the sample. The mixtures of Examples 1 to 33 and 35 to 67 were white and creamy. The mixture of Example 34 was liquid. The temperature of the mixture was then measured 5 minutes after preparation at room temperature (20 to 25°C).

[0087] <Evaluation procedure for evaluation items using wigs> The wig (Tokyo Charm No. 5, manufactured by Mitsuya Co., Ltd.: 100% human hair, hair length approximately 27-32cm) was divided into three sections: the over-section (top of the head), the middle section (a 5cm wide area at the back of the head stretching from above the right ear to above the left ear), and the under-section (from the bottom center of the back of the head to the nape). The middle section, which has the highest hair density, was further divided vertically into four sections.

[0088] For each of the four middle sections, 90 g of the mixture was applied to the hair with a brush. Immediately after application, a thermometer was inserted 3 cm from the root of the hair and fixed in place. The reading on the fixed thermometer was checked once every five minutes, for a total of 12 times over 60 minutes (evaluation item (1)). The state of dripping from the hair to which the mixture had been applied was also checked (evaluation item (3)).

[0089] After 60 minutes, the thermometer was removed, and the hair to which the mixture had been applied was combed to check how dry the mixture had been (evaluation item (2)).The hair was then rinsed with hot water at about 40°C, towel-dried, and then dried with a hair dryer, and a sensory evaluation was performed (evaluation items (5), (6), and (7)).

[0090] In Example 34, the formulation of the oxidizing agent composition was not adjusted with other ingredients and was liquid, so evaluation items (2) and (3) were not performed. In addition, for Example 67 only, sensory evaluation was also performed on the ease of application with a brush and the smoothness of the composition when rinsed (evaluation items (9) and (10)).

[0091] <Evaluation procedure for evaluation items using hair bundles> A mixture of 9 g of 3 g of the alkaline agent composition shown in Table 2 and 6 g of the sample was prepared. 9 g of the mixture was applied with a brush to 1 g of a 10 cm black hair bundle (BS-BA: manufactured by Beaulux, 100% human hair) and left to act at room temperature for 60 minutes to perform a bleaching treatment. After 60 minutes, the hair bundle was rinsed with hot water at approximately 40°C, towel-dried, and then dried with a hair dryer.

[0092] The color of the hair bundle before and after bleaching treatment (L * a * b * The color difference (ΔE) was calculated using the following formula (I) (evaluation item (4)). The larger the ΔE value, the stronger the bleaching and destaining power.

[0093] [ka] L1: L of the dried hair bundle after bleaching treatment * value L2: Black hair bundle (before bleaching) * value a1: A of the dried hair bundle after bleaching treatment * value a2: Black hair bundle (before bleaching treatment) * value b1: B of a dried hair bundle after bleaching treatment * value b2: Black hair bundle (before bleaching treatment) * value

[0094] <Sensory evaluation method> Ten expert panelists (hairdressers) conducted sensory evaluations, one for each item, according to the evaluation criteria described in items (2), (3), (5)-(7), (9), and (10). The average scores of the 10 panelists for each item were calculated and evaluated as follows: ◎◎: The average rating of 10 expert panelists (hairdressers) is 4.5 points or higher. ◎: The average rating of 10 expert panelists (hairdressers) is 3.5 points or more but less than 4.5 points. ○: The average evaluation score of 10 professional panelists (hairdressers) is 2.5 points or more and less than 3.5 points. △: The average rating of 10 professional panelists (hairdressers) is 1.5 points or more but less than 2.5 points. ×: The average evaluation score of 10 professional panelists (hairdressers) is less than 1.5 points.

[0095] <Evaluation items> (1) Temperature during treatment The hair temperature was checked a total of 12 times over a 60-minute period, and the highest temperature was used for evaluation. ◎◎: Less than 45℃ ◎: 45℃ or higher and lower than 47℃ ○: 47℃ or higher and lower than 49℃ △: 49℃ or higher and lower than 51℃ ×: 51℃ or higher

[0096] (2) Dryness during treatment 60 minutes after applying the mixture to the hair, the hair was combed and evaluated for cream retention. 5 points: The cream condition is maintained 4 points: The mixture is dry immediately after application, but remains in a cream state and does not come off the hair when combing. 3 points: The mixture comes off the hair when combed the first time, but becomes creamy after 2-3 combs to spread it out 2 points: Powder does not fall off during combing, but does not become creamy even after combing 1 point: The cream does not stay in place, the mixture is completely dry, and powder falls off when touched, making it impossible to comb.

[0097] (3) Dripping during treatment Sixty minutes after the mixture was applied to the hair, the mixture or liquid components separated from the mixture were evaluated for dripping and sagging. 5 points: No dripping at all, the mixture stays in place 4 points: No dripping, but the mixture is slightly off-center 3 points: Dripping occurs, but not enough to require reapplication 2 points: Dripping significantly, needing to be reapplied 1 point: The mixture separates and the separated aqueous phase drips

[0098] (4) Brightness of the finish The color difference (ΔE) of the hair bundle before and after the bleaching treatment was calculated using the above formula (I). The calculated values ​​were evaluated according to the following criteria. ◎◎: 35 or above ◎: 30 or more and less than 35 ○: 25 or more and less than 30 △: 20 or more and less than 25 ×: Less than 20

[0099] (5) Finger-running After the treatment, the wig was rinsed with hot water at about 40°C, towel dried, and then dried with a hair dryer. After drying, the wig was passed through with fingers and evaluated for feel. 5 points: Very smooth to the touch 4 points: Easy to run your fingers through 3 points: Less snagging, slightly smooth to the touch 2 points: There is some catching and it is difficult to run your fingers through 1 point: Very sticky and difficult to run your fingers through

[0100] (6) Smoothness of hair ends After the treatment, the wig was rinsed with hot water at about 40°C, towel dried, and then dried with a hair dryer. After drying, the wig was combed and the ends of the hair were lightly smoothed with the hands, and the degree of neatness of the ends was evaluated visually. 5 points: Very well organized 4 points: Well organized 3 points: Not wide-ranging, but somewhat compact 2 points: Spreading 1 point: Very widespread

[0101] (7) Firmness and elasticity After the treatment, the wig was rinsed with hot water at about 40°C, towel dried, and then dried with a hair dryer. After drying, the wig was held in the hand and the firmness and stiffness of the hair were evaluated by touch. 5 points: Very firm and resilient 4 points: Feels firm and resilient 3 points: Firmness and elasticity are not lost, and there is a slight feeling of firmness and elasticity 2 points: Not much firmness or elasticity 1 point: No firmness or elasticity at all

[0102] (8) Storage stability 80 g of the sample was placed in a 100 g PET container and stored in a thermostatic bath (IN604, manufactured by Yamato Scientific Co., Ltd.) at 50° C. for 30 days. The appearance of the sample after storage was evaluated. ◎◎: No change in appearance at all ◎: The sample swells slightly, but there is little change in appearance. ○: The sample swells, but does not leak out of the container △: The sample swells significantly and leaks out of the container. ×: The sample swelled significantly, leaking from the container and separating.

[0103] (9) Ease of application The mixture was evaluated for ease of application on the hair. 5 points: Very easy to apply, evenly distributed from the ends to the roots 4 points: Easy to apply and evenly distributed from the ends to the roots 3 points: A little difficult to apply, but can be applied evenly from the ends to the roots 2 points: Difficult to apply, not evenly distributed from the ends to the roots 1 point: Very difficult to apply and requires reapplication

[0104] (10) Finger-smoothing when rinsing After the treatment, the wig was rinsed with hot water at about 40°C, and the wig was then run through with the fingers to evaluate the feel of the wig. 5 points: Very smooth to the touch 4 points: Easy to run your fingers through 3 points: Less snagging, slightly smooth to the touch 2 points: There is some catching and it is difficult to run your fingers through 1 point: Very sticky and difficult to run your fingers through

[0105] [Table 3]

[0106] [Table 4]

[0107] [Table 5]

[0108] [Table 6]

[0109] [Table 7]

[0110] [Table 8]

[0111] [Table 9]

[0112] [Table 10]

[0113] [Table 11]

[0114] The oxidizing agent composition prepared in Comparative Example 1 had a lower content of component (A) than the specified value, and therefore was unable to suppress heat generation when applied to hair. Furthermore, the oxidizing agent composition prepared in Comparative Example 1 dried out during treatment and dripped.

[0115] The oxidizing agent composition produced in Comparative Example 2 had a content of component (A) greater than the specified value, and therefore the agent separated, resulting in poor storage stability.

[0116] The oxidizing agent composition produced in Comparative Example 3 had a content of component (B) lower than the specified value, and therefore was unable to suppress heat generation when applied to hair, causing the agent to dry out and dripping.

[0117] The oxidizing agent composition produced in Comparative Example 4 had a weak bleaching power because the mass ratio ((B) / (A)) of the (A) component to the (B) component was greater than 10. Furthermore, the oxidizing agent composition produced in Comparative Example 4 separated, and the storage stability was poor.

[0118] The oxidizing agent composition produced in Comparative Example 5 did not contain component (C), and therefore had very weak bleaching power.

[0119] The oxidizing agent composition produced in Comparative Example 6 had a weak bleaching power because the content of component (C) was lower than the specified value. In addition, the oxidizing agent composition produced in Comparative Example 6 did not feel very firm or resilient, and the texture was poor.

[0120] The oxidizing agent composition prepared in Comparative Example 7 contained a higher content of component (C) than the specified value, and therefore heat generation upon application to hair could not be suppressed, the agent separated, and the storage stability was poor. Furthermore, the oxidizing agent composition prepared in Comparative Example 7 dried out and dripped during treatment, and the texture was also poor.

[0121] The oxidizing agent composition produced in Comparative Example 8 had a pH lower than the specified value, and therefore had a weak bleaching power and poor storage stability.

[0122] The oxidizing agent composition prepared in Comparative Example 9 had a pH higher than the specified value, and therefore heat generation upon application to hair could not be suppressed, the agent separated, and the storage stability was poor. Furthermore, the oxidizing agent composition prepared in Comparative Example 9 dried out and dripped during treatment, and the texture was also poor.

Claims

1. An oxidizing agent composition containing hydrogen peroxide for use in bleaching and decoloring hair by mixing with an alkaline agent composition containing an alkaline agent, the oxidizing agent composition contains, based on 100% by mass, 0.2 to 2.0% by mass of a chelating agent (A), 0.4% by mass or more of an acid (B), and 0.1 to 2.0% by mass of a metal hydroxide (C); the mass ratio ((B) / (A)) of the chelating agent (A) to the acid (B) is 10 or less; The oxidizer composition has a pH at 25°C within the range of 1.5 to 5.

5.

2. The oxidizing agent composition according to claim 1, further comprising 1.0 to 5.0 mass% of a polyol (D).

3. The oxidizing agent composition according to claim 1, further comprising 0.5 to 6.0 mass % of a hydrocarbon (E) that is liquid at room temperature.

4. The oxidizing agent composition according to claim 1, further comprising 0.1 to 5.0 mass % of an ester (F).

5. 2. The oxidizing agent composition according to claim 1, wherein the chelating agent (A) is an organic phosphonic acid-based chelating agent.

6. The oxidizer composition of claim 1 , wherein the acid (B) is an inorganic acid.

7. 2. The oxidizing agent composition according to claim 1, having a viscosity at 25°C of 5,000 to 40,000 mPa·s.

8. A bleaching / decolorizing agent comprising a mixture of an alkaline agent composition containing an alkaline agent and the oxidizing agent composition according to any one of claims 1 to 7.

9. A method for bleaching and decoloring hair, comprising: A step (I) of mixing an alkaline agent composition containing an alkaline agent with the oxidizing agent composition according to any one of claims 1 to 7 to obtain a mixture; After step (I), step (II) of applying the mixture to hair; After step (II), step (III) is performed on the hair by applying the mixture for 30 to 120 minutes. Hair bleaching and decolorizing methods.

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