Hair treatment method, hair composition, medulla filler, white hair treatment agent, and hair treatment agent

Abstract

To provide a hair treatment method suitable for modifying the inside of hair.SOLUTION: This method for treating the hair comprises bringing a composition for the hair containing components (A) and (B) and satisfying (i) and / or (ii) into contact with the hair so as to reduce the void of the medulla of the hair. The component (A) is at least one selected from the group consisting of hydrolyzed proteins, amino acids, and derivatives thereof. Component (B) is a penetrant. (i) is to contain a reduced hydrolyzed protein capable of acting as a reducing agent as the component (A). (ii) is to further comprise a reducing agent as component (C). The pH of the composition for hair at 25 °C is ≥ 3.0 and <8.0.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a hair treatment method, a hair composition, a medulla filler, a gray hair treatment agent, and a hair treatment agent. More specifically, the present invention relates to a hair treatment method, a hair composition, a medulla filler, a gray hair treatment agent, and a hair treatment agent that are suitable for modifying the inside of hair. [Background technology]

[0002] It is known that hair texture, such as shine, firmness, and manageability, declines with age. In addition, hair is damaged by chemical treatments such as hair coloring and perms, as well as physical treatments that use heat, such as hair irons and hair dryers. Examples of damage include the peeling of the cuticle on the hair surface and hollowing out of the hair. Hollowing out of the hair interior can occur, for example, when lipids inside the hair are lost.

[0003] To address the above-mentioned problems, hair treatment agents containing specific compounds have been proposed. Patent Document 1 discloses an oil-in-water emulsion hair cosmetic containing a specific silicone and a cationic polymer. Patent Document 2 discloses a two-component hair treatment agent having a first component to be applied to the hair and a second component to be applied without rinsing off the first component. Patent Document 3 discloses a hair cosmetic that combines a specific lactone derivative, sunflower seed extract, a fatty acid that is liquid at 25°C, and an ester oil. Patent Document 4 discloses an oil-based hair cosmetic containing dimethylpolysiloxane, dimethiconol, and isononyl isononanoate.

[0004] Hair is composed of a cuticle (cuticle) covering the surface of the hair, a cortex (cuticle) present inside the hair, and a medulla (medulla) present in the center of the hair. It has also been proposed to improve hair texture by applying a hair treatment agent to the inside of the hair rather than the surface. Patent Document 5 discloses a medulla care agent having a specific functional group. The molecular weight of the active ingredient of the medulla care agent used in the examples of Patent Document 5 is, for example, less than 200. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-172378 [Patent Document 2] Patent No. 6161265 [Patent Document 3] Japanese Patent Application Publication No. 2017-25004 [Patent Document 4] Japanese Patent Application Publication No. 2019-99533 [Patent Document 5] Japanese Patent Application Laid-Open No. 2000-109411 Summary of the Invention [Problem to be solved by the invention]

[0006] The cosmetics or treatments disclosed in Patent Documents 1 to 4 apply polymers or oils to the surface of hair to temporarily improve hair texture. However, these cosmetics or treatments have difficulty modifying the inside of hair. The effects of polymers or oils attached to the hair surface are short-lived. The adhesion of polymers or oils can make hair sticky or give it an unnatural feel. In contrast, Patent Document 5 attempts to modify the inside of hair. However, according to the inventors' investigations, the improvement in hair texture achieved by this technology is limited and not sufficiently long-lasting.

[0007] An object of the present invention is to provide a new hair treatment method suitable for modifying the inside of hair, and a new hair composition suitable for modifying the inside of hair. [Means for solving the problem]

[0008] The present invention provides Provided is a hair treatment method that reduces voids in the medulla of hair by contacting hair with a hair composition that contains the following components (A) and (B), has a pH of 3.0 or more and less than 8.0 at 25°C, and satisfies at least one of the following (i) and (ii): (i) The component (A) contains a reduced hydrolyzed protein that can act as a reducing agent. (ii) Further contains the following component (C): (A) at least one selected from the group consisting of hydrolyzed proteins, amino acids, and derivatives thereof; (B) Penetrating agent (C) Reducing agent

[0009] From another aspect, the present invention provides: contacting hair with a hair composition containing at least one selected from the group consisting of hydrolyzed proteins, amino acids, and derivatives thereof; maintaining the hair composition in contact with the hair until at least one ingredient contained in the hair composition penetrates into the hair, thereby substantially filling the medulla of the hair; A method for treating hair is provided, comprising:

[0010] From another aspect, the present invention provides: contacting hair having black medulla with a hair composition containing at least one selected from the group consisting of hydrolyzed proteins, amino acids, and derivatives thereof; maintaining contact of the hair composition with the hair until the black medulla changes to white medulla; A method for treating hair is provided, comprising:

[0011] From yet another aspect, the present invention provides A hair composition for modifying the medulla of hair, comprising: It contains the following components (A) and (B), The pH at 25°C is 3.0 or more and less than 8.0, At least one selected from the group consisting of the following (i) and (ii) is satisfied: A hair composition is provided. (i) The component (A) contains a reduced hydrolyzed protein that can act as a reducing agent. (ii) Further contains the following component (C): (A) at least one selected from the group consisting of hydrolyzed proteins, amino acids, and derivatives thereof; (B) Penetrating agent (C) Reducing agent

[0012] From yet another aspect, the present invention provides A medulla filler comprising the hair composition according to the present invention is provided.

[0013] From yet another aspect, the present invention provides A hair gray treatment agent comprising the hair composition according to the present invention is provided.

[0014] From yet another aspect, the present invention provides a first agent containing the hair composition according to the present invention; and a second agent containing an oxidizing agent. [Effects of the Invention]

[0015] According to the present invention, there is provided a hair treatment method suitable for modifying the inside of hair, and a hair composition suitable for modifying the inside of hair. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is an image of human hair treated with the hair composition according to Example 1, observed under an optical microscope. [Figure 2]FIG. 2 is an image of human hair treated with the hair composition according to Example 2, observed under an optical microscope. [Figure 3] FIG. 3 is an image of human hair treated with the hair composition according to Example 4, observed under an optical microscope. [Figure 4] FIG. 4 is an image of human hair treated with the hair composition according to Example 11, observed under an optical microscope. [Figure 5] FIG. 5 is an image of human hair treated with the hair composition according to Comparative Example 3, observed under an optical microscope. [Figure 6] FIG. 6 is an image of human hair treated with the hair composition according to Comparative Example 4, observed under an optical microscope. [Figure 7] FIG. 7 is an image of human hair treated with the hair composition according to Comparative Example 5, observed under an optical microscope. [Figure 8] FIG. 8 is an image of human hair treated with the hair composition according to Comparative Example 6, observed under an optical microscope. [Figure 9] FIG. 9 is an image of human hair treated with the hair composition according to Comparative Example 9, observed under an optical microscope. [Figure 10] FIG. 10 is an image of human hair treated with the hair composition according to Comparative Example 10, observed under an optical microscope. [Figure 11] FIG. 11 is an image of human hair treated with the hair composition according to Comparative Example 11, observed under an optical microscope. [Figure 12] FIG. 12 is an image of human hair that has not been treated with a hair composition, as viewed under an optical microscope. [Figure 13] FIG. 13 is a photograph of hair strands treated with the hair compositions according to Example 2, Comparative Example 3, and Comparative Example 9, followed by a basic hair dye. [Figure 14] FIG. 14 is a photograph of a hair strand treated with the hair compositions according to Example 2 and Comparative Example 5 and then treated with a straightening iron. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present invention will be described, but the following description does not limit the present invention to a specific embodiment.

[0018] The medulla of hair typically has a porous structure made up of fibrous materials. The voids in the porous structure of the medulla increase with age or damage to the hair due to chemical or physical treatments. Depending on the hair, the medulla may be made up of voids locally or throughout most of the hair. According to this embodiment, the medulla of hair can be modified. The modification of the medulla is achieved, for example, by reducing the voids in the medulla.

[0019] A hair composition according to one embodiment of the present invention contains components (A) to (C). (A) at least one selected from the group consisting of hydrolyzed proteins, amino acids, and derivatives thereof; (B) Penetrating agent (C) Reducing agent

[0020] A hair composition according to another embodiment of the present invention comprises components (A1) and (B). (A1) At least one selected from the group consisting of reduced hydrolyzed proteins and their derivatives (B) Penetrating agent In this embodiment, component (A1) can also act as a reducing agent, so the inclusion of component (C) is optional.

[0021] The pH of the hair composition in these forms (hereinafter referred to as the hair composition according to this embodiment) is 3.0 or more and less than 8.0 at 25°C.

[0022] The hair composition according to the present embodiment can improve the texture of hair, specifically improving hair gloss, firmness, body, manageability, and the like.

[0023] The hair composition according to the present embodiment makes it possible to reduce the voids in the hair medulla. This effect can also reduce the large voids in the medulla. Conventional medulla care agents (see Patent Document 5) have limitations in their effectiveness in reducing the voids in the medulla, and the effect of reducing voids is not sufficiently sustained.

[0024] In this specification, when hair is observed under transmitted light using an optical microscope set at 500x magnification, a medulla in which the black void observed in the center of the hair extends across the longitudinal section of the medulla, in other words, the cross section of the medulla along the axial direction of the hair, is referred to as a "black medulla" (see Figure 12 for an example), and a medulla that is filled so that there are no voids extending to this extent and that appears white overall is referred to as a "white medulla" (see Figure 1 for an example). Note that, to observe the medulla of hair, hair that has been contacted with a hair composition, washed with water, and air-dried is used. Details of the method for observing medulla using transmitted light are described in the Examples section.

[0025] Black medulla is often observed in damaged hair, especially gray hair. White medulla reduces the amount of light scattered by hair and increases the amount of light transmitted through hair, resulting in increased transparency, especially in gray hair, making gray hair less noticeable. White medulla typically contains more fibrous material than black medulla, resulting in fewer voids. However, because medulla inherently has a porous structure, fine voids also exist in white medulla. Therefore, microscopic observation using an electron microscope typically reveals voids in white medulla. Furthermore, the voids in black medulla may actually contain fibrous material that constitutes the porous structure. However, according to the inventors' studies, the difference between black medulla and white medulla significantly affects the degree of scattering of transmitted light, which is a factor that influences hair gloss, texture, and the like. The hair composition according to this embodiment enables the transformation of black medulla into white medulla. However, the hair to be treated with the hair composition according to this embodiment is not limited to hair having black medulla.

[0026] When hair is damaged, substances such as moisture can easily penetrate into the hair. This can cause, for example, swelling of hair components such as the cortex, resulting in a reduction in the porosity of the medulla. In this case, when hair is observed under transmitted light using an optical microscope, the scattering of transmitted light is suppressed, making it appear as if a white medulla has formed. However, because the hair is damaged, substances that have penetrated into the hair easily leak out of the hair. As a result, the effect of reducing the porosity of the medulla is limited, and the effect is not sufficiently durable. In this case, it is difficult to say that the inside of the hair has been modified. The hair composition according to this embodiment, for example, acts on the medulla while reducing damage to the hair, thereby reducing the porosity of the medulla. In addition, the hair composition is less likely to leak out of the hair even when the hair is dried. Therefore, the hair composition according to this embodiment can also improve the durability of the effect of reducing the porosity of the medulla.

[0027] The hair composition according to this embodiment is useful, for example, as a medulla filler. Regardless of its specific name, a medulla filler is an agent whose efficacy includes the progression of medulla filling or an effect associated therewith. In other words, the medulla filler may be sold, for example, as a hair conditioner, the efficacy of which is to improve hair texture by filling the medulla. As described above, the degree of medulla filling can be confirmed by observation using an optical microscope. If, in this observation, voids extending to a degree that crosses a longitudinal cross section along the axial direction of the medulla are eliminated, the medulla can be considered to be "substantially filled." To the inventors' knowledge, no treatment agent that modifies the inside of hair to the extent that the medulla is substantially filled has been known until now.

[0028] Surprisingly, it has been found that use of the hair composition according to this embodiment has the effect of making gray hair less visible. Significant reduction in medulla voids, preferably substantial filling of the medulla, increases transparency, particularly in gray hair. Furthermore, gray hair becomes less noticeable, especially when gray hair is partially present in hair, in other words, in hair mixed with gray hair. Furthermore, the improved transparency also improves the texture of the gray hair itself. Moreover, this effect can be achieved in conjunction with improved hair texture. This is a feature that is difficult to obtain from conventional gray hair dyes, which often damage hair. In this respect, the hair composition according to this embodiment can also be used as a gray hair treatment agent. Conventional gray hair treatment agents contain compounds that act directly as hair dyes or that can form hair dyes. In contrast, the above-mentioned gray hair treatment agent, i.e., the gray hair treatment agent according to this embodiment, does not necessarily contain a compound for hair dyeing. In other words, in the gray hair treatment agent according to this embodiment, the hair dye or the compound that can form a hair dye is an optional component. To the best of the inventors' knowledge, no treatment agent has been known to date that improves the texture of gray hair or makes partial gray hair less visible.

[0029] Regardless of the specific name, the gray hair treatment agent according to this embodiment is also an agent whose efficacy includes improving the texture of gray hair and making it less visible. The gray hair treatment agent may be sold under the name of a hair conditioner or other names.

[0030] Traditionally, oxidative hair dyes containing oxidative dyes have been used to make gray hair less noticeable. However, the use of oxidative hair dyes can easily damage hair. In other words, conventional oxidative hair dyes tend to decompose the fibrous materials contained in the medulla. Although oxidative hair dyes initially dye gray hair, the medulla becomes hollow inside. In contrast, the hair composition of this embodiment actually reduces the voids in the medulla. In other words, the hair composition of this embodiment makes it possible to repair gray hair from the inside. As a result, gray hair with increased transparency can be obtained.

[0031] The hair modification using the hair composition according to this embodiment can be highly durable. The durability of the hair modification is particularly pronounced when component (A) contains a hydrolyzed protein, amino acid, or derivative thereof with a large molecular weight. Components (A) and (C) are thought to cleave disulfide bonds in the hair, promoting penetration of the components and allowing the high-molecular-weight component (A) to effectively penetrate the interior of the hair. Components with a low molecular weight, such as lower alcohols, easily penetrate the interior of the hair, but are easily washed out during washing, etc. It is also desirable for the hair composition to have an appropriate pH. A pH that is too low or too high can damage the hair. For example, if the pH of the hair composition is too high, the hair will swell significantly, making it more likely that the components that have penetrated the hair will be lost.

[0032] The hair composition according to the present embodiment may be used in combination with another hair composition containing an oxidizing agent. In this use form, the hair composition according to the present embodiment is contained in the first agent of the hair treatment agent. The second agent of the hair treatment agent contains a hair composition containing an oxidizing agent. The oxidizing agent is used to regenerate disulfide bonds cleaved by a reducing agent. Although the use of an oxidizing agent is not essential, the repair of disulfide bonds by the oxidizing agent can make the hair modification by the hair composition according to the present embodiment more durable.

[0033] The components of the hair composition will be described below.

[0034] Ingredient (A) Component (A) is at least one selected from the group consisting of hydrolyzed proteins, amino acids, and derivatives thereof. Hydrolyzed proteins are peptide compounds obtained by hydrolyzing proteins. Examples of hydrolyzed proteins include naturally occurring protein hydrolysates (PPTs). Examples of hydrolyzed proteins include hydrolyzed keratin, hydrolyzed silk, hydrolyzed almond protein, hydrolyzed casein, hydrolyzed oat protein, hydrolyzed yeast protein, hydrolyzed collagen, hydrolyzed conchiolin, hydrolyzed white lupin protein, hydrolyzed soy protein, hydrolyzed pea protein, hydrolyzed corn protein, hydrolyzed milk protein, hydrolyzed honey protein, hydrolyzed hazelnut protein, hydrolyzed jojoba protein, hydrolyzed vegetable protein, hydrolyzed royal jelly protein, hydrolyzed wheat protein, and hydrolyzed rice protein. Only one of these hydrolyzed proteins may be used, or two or more may be used in combination.

[0035] Examples of amino acids and amino acid derivatives are glutamic acid, aspartic acid, glycine, serine, arginine, methionine, trimethylglycine, sodium polyaspartate, sodium dilauroyl glutamate lysine, N-lauroyl-L-lysine, dihydroxypropyl arginine HCl, and PPG-2 arginine.

[0036] Hydrolyzed protein derivatives refer to hydrolyzed proteins that have been chemically modified, such as silylated, acylated, or cationized. Examples of silylated hydrolyzed proteins include (dihydroxymethylsilylpropoxy)hydroxypropyl hydrolyzed silk, (dihydroxymethylsilylpropoxy)hydroxypropyl hydrolyzed soy protein, (dihydroxymethylsilylpropoxy)hydroxypropyl hydrolyzed wheat protein, (dihydroxymethylsilylpropoxy)hydroxypropyl hydrolyzed collagen, hydrolyzed sesame protein PG propyl methylsilanediol, and (dihydroxymethylsilylpropoxy)hydroxypropyl hydrolyzed keratin. Examples of acylated hydrolyzed proteins include lauroyl hydrolyzed silk, isostearoyl hydrolyzed silk, cocoyl hydrolyzed soy protein, palmitoyl hydrolyzed wheat protein, cocoyl hydrolyzed collagen, undecylenoyl hydrolyzed collagen, isostearoyl hydrolyzed collagen, and rosin hydrolyzed collagen. Examples of cationized hydrolyzed proteins include hydroxypropyltrimonium hydrolyzed silk, cocodimonium hydroxypropyl hydrolyzed silk, hydroxypropyltrimonium hydrolyzed wheat protein, cocodimonium hydroxypropyl hydrolyzed wheat protein, hydroxypropyltrimonium hydrolyzed collagen, cocodimonium hydroxypropyl hydrolyzed collagen, hydroxypropyltrimonium hydrolyzed casein, cationized hydrolyzed conchiolin, and hydroxypropyltrimonium hydrolyzed keratin. Only one selected from these hydrolyzed protein derivatives may be used, or two or more may be used in combination.

[0037] Component (A) may contain component (A1). Component (A1) is at least one selected from the group consisting of reduced hydrolyzed proteins and their derivatives. A reduced hydrolyzed protein is a protein having a cysteine ​​residue obtained by reducing a disulfide bond contained in a hydrolyzed protein. The meaning of the derivative is as explained above for the hydrolyzed protein derivative. The cysteine ​​residue contained in component (A1) enables a hair composition containing component (A1) to cleave disulfide bonds in hair through the reducing action of component (A1).

[0038] The hair composition according to the present embodiment may contain, as component (A), at least one selected from the group consisting of hydrolyzed proteins and their derivatives. Component (A) may also be at least one selected from the group consisting of hydrolyzed proteins other than reduced hydrolyzed proteins and their derivatives, or at least one selected from the group consisting of amino acids and their derivatives. Component (A) may also be a component other than component (A1) (hereinafter referred to as component (A2)).

[0039] When the hair composition contains component (A1), it may contain component (C), i.e., a reducing agent, or it may be substantially free of component (C). "Substantially free" means that trace amounts of the reducing agent are permitted, and the concentration of the reducing agent is less than 2% by mass, preferably less than 1% by mass, and particularly less than 0.5% by mass, based on the total mass of the hair composition.

[0040] A preferred example of a reduced hydrolyzed protein is reduced hydrolyzed keratin. Reduced hydrolyzed keratin may have many cysteine ​​residues. Therefore, if component (A1) is reduced hydrolyzed keratin, the desired effects are more likely to be reliably achieved. Note that reduced hydrolyzed keratin does not necessarily have all of the disulfide bonds contained in the hydrolyzed keratin reduced; disulfide bonds may remain.

[0041] The molecular weight of component (A) is not particularly limited, and is preferably 250 or more, 300 or more, 400 or more, 600 or more, 800 or more, 1,000 or more, or even 5,000 or more, and may be 10,000 or more, particularly 20,000 or more. The upper limit of the molecular weight of component (A) is not particularly limited, and may be 50,000, 45,000, 40,000, or even 35,000. When the molecular weight of component (A) is high, the hair modification effect of the hair composition becomes more pronounced and the effect lasts longer. When component (A) corresponds to a hydrolyzed protein or polymer, its molecular weight is often expressed as an average molecular weight. In this case, the average molecular weight is considered to be the molecular weight, and an appropriate component (A) can be selected based on the upper and lower limits of the above-mentioned preferred range. The average molecular weight may be either a number-average molecular weight or a weight-average molecular weight. However, if the use of the number-average molecular weight or the weight-average molecular weight results in a difference in whether the molecular weight falls within the preferred range (for example, 10,000 or more and 50,000 or less), the following applies: That is, when component (A) is component (A1), the weight-average molecular weight is applied, and when component (A) is component (A2), the number-average molecular weight is applied for the determination.

[0042] The content of component (A) relative to the total weight of the hair composition is not limited to a specific value and may be 0.1% to 50% by weight, 1% to 30% by weight, 3% to 20% by weight, 5% to 15% by weight, or even 5.5% to 15% by weight. When component (A) is component (A2), the content of component (A) relative to the total weight of the hair composition may be 1% to 8% by weight, or even 3% to 7% by weight. When component (A) is component (A1), the content of component (A) relative to the total weight of the hair composition may be 5% to 20% by weight, 5.5% to 20% by weight, 6% to 18% by weight, or even 8% to 15% by weight.

[0043] ·Component (B) Component (B) is a penetrating agent. The penetrating agent promotes the penetration of component (A) into the interior of the hair. The penetrating agent may penetrate into the interior of the hair.

[0044] Examples of the penetrating agent (B) are amines, alcohols, and surfactants.

[0045] Examples of amines are urea, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, 2-amino-2-methyl-1-propanol, 2-aminobutanol, 2-amino-2-methyl-1,3-propanediol, and guanidine.

[0046] Examples of alcohols include lower alcohols, higher alcohols, and polyhydric alcohols. Examples of lower alcohols include ethanol and isopropanol. As the lower alcohol, isopropanol is preferably used. Examples of higher alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, cetostearyl alcohol, and behenyl alcohol. Examples of polyhydric alcohols include ethylene glycol, propylene glycol, 1,3-butylene glycol, 1,4-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,6-hexanediol, neopentyl glycol, 1,8-octanediol, 1,10-decanediol, diethylene glycol, spiroglycol, propylene glycol, dipropylene glycol, glycerin, and diglycerin. As alcohols, isopropanol, 1,3-butylene glycol, and glycerin can be used.

[0047] Examples of surfactants are anionic surfactants and nonionic surfactants.

[0048] Examples of anionic surfactants include alkyl ether sulfates, alkyl sulfates, alkyl ether sulfate esters, alkenyl ether sulfates, alkenyl sulfates, olefin sulfonates, alkanesulfonates, saturated or unsaturated fatty acid salts, alkyl ether carboxylates, alkenyl ether carboxylates, α-sulfonic acid salts, phosphate monoester surfactants, phosphate diester surfactants, sulfosuccinates, N-acyl glutamic acid, N-acyl methyl taurine salts, alkyl sulfosuccinates, polyoxyethylene alkyl ether phosphates, and derivatives thereof. An example of an alkyl ether sulfate ester is sodium polyoxyethylene lauryl ether sulfate. Examples of alkyl sulfates are sodium lauryl sulfate and sodium cetyl sulfate. An example of a derivative of an alkyl sulfate is sodium polyoxyethylene lauryl sulfate. An example of an alkyl ether carboxylate is sodium laureth-4 carboxylate. An example of a sulfosuccinate is disodium lauryl sulfosuccinate.

[0049] Examples of nonionic surfactants are polyoxyethylene alkyl ethers, polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid esters, polyoxyethylene hydrogenated castor oil, alkyl glucosides, lipophilic glyceryl monostearate, and coconut oil fatty acid diethanolamide.

[0050] Component (B) may be one selected from these compounds, or two or more may be used in combination. Component (B) may contain at least one selected from the group consisting of amines and alcohols, or may contain both. Component (B) preferably contains amines and alcohols. This configuration ensures that the hair modification effect of the hair composition can be more reliably obtained, and the duration of this effect is also more reliably improved. Component (B) may contain only amines. The amine is preferably urea. Urea has the ability to denature proteins. Therefore, by contacting the hair composition with hair, urea can denature hair proteins. As a result, the hair composition can easily penetrate into the hair.

[0051] The molecular weight of component (B) is not limited to a particular value and may be 300 or more, or even 500 or more. The molecular weight of component (B) is preferably less than 300, less than 200, or even less than 100, and particularly preferably 80 or less.

[0052] The content of component (B) relative to the total mass of the hair composition is not limited to a specific value and may be 0.1% by mass to 50% by mass, 5% by mass to 45% by mass, or even 10% by mass to 40% by mass. When component (B) contains amines and alcohols, the content of the amines relative to the total mass of the hair composition may be 1% by mass or more, 2% by mass or more, 3% by mass or more, 5% by mass or more, 5.5% by mass or more, 6% by mass or more, or even 8% by mass or more, and may be 45% by mass or less, 40% by mass or less, 35% by mass or less, or even 32% by mass or less. When component (B) contains amines and alcohols, the content of alcohols relative to the total mass of the hair composition may be 1 mass% or more, 2 mass% or more, 3 mass% or more, 3.5 mass% or more, 5 mass% or more, 7 mass% or more, 8 mass% or more, or even 8.5 mass% or more, and may be 30 mass% or less, 25 mass% or less, 20 mass% or less, 15 mass% or less, or even 12 mass% or less.

[0053] In the hair composition, the ratio of the content of component (B) to the content of component (A) is not limited to a specific value and may be, by mass, 0.1 to 30, 0.5 to 10, particularly more than 1 but not more than 10, preferably more than 1 but not more than 7, more preferably more than 1 but not more than 5, even more preferably more than 1 but not more than 4.5, and particularly preferably more than 1 but not more than 4.2.

[0054] ·Component (C) The reducing agent acts on the disulfide bonds in hair, promoting the penetration of component (A) into the hair. Alternatively, the reducing agent may contribute to the presence of cysteine ​​residues in the hair composition by acting on the disulfide bonds contained in the hair composition. Examples of reducing agents include cysteines, ascorbic acid, ascorbate salts, sulfurous acid, sulfite salts, pyrosulfite salts, and thiols. Examples of cysteines include L-cysteine, D-cysteine, DL-cysteine, N-acetylcysteine, L-cysteine ​​hydrochloride, and DL-cysteine ​​hydrochloride. Examples of ascorbic acid and ascorbate salts include L-ascorbic acid and sodium L-ascorbate. Examples of sulfite salts include sodium sulfite, potassium sulfite, ammonium sulfite, monoethanolamine sulfite, sodium bisulfite, and ammonium bisulfite. Examples of pyrosulfite salts include sodium pyrosulfite and potassium pyrosulfite. Examples of thiols include cysteamines, thiolactic acid, thioglycerin, butyrolactone thiol, and thioglycolate. Examples of cysteamines include cysteamine and cysteamine hydrochloride. Examples of thioglycolate include thioglycolic acid, sodium thioglycolate, ammonium thioglycolate, monoethanolamine thioglycolate, and esters of thioglycolic acid and glycerin. Component (C) may be used alone or in combination of two or more selected from these compounds.

[0055] Examples of preferred reducing agents include sulfite, sulfite salts, and pyrosulfite salts. These reducing agents can have high reducing power in a weakly acidic to near-neutral pH range. As described below, the pH of the hair composition at 25°C is 3.0 or higher and less than 8.0, and the above-mentioned reducing agents can exhibit appropriate reducing power in this pH range. As a result, the hair composition can have high reducing power. In addition, by including the above-mentioned reducing agent in the hair composition, the hair composition can more reliably obtain the effect of medulla modification and more reliably improve the durability of the effect. Furthermore, by using the above-mentioned reducing agent, the hair composition can be maintained in a weakly acidic to near-neutral pH range, thereby reducing damage to other components of the hair, such as the cortex and cuticle.

[0056] The content of component (C) relative to the total mass of the hair composition is not limited to a specific value, and may be 0.1% by mass to 15% by mass, 1% by mass to 10% by mass, or even 2% by mass to 8% by mass.

[0057] Other ingredients The hair composition may contain any component other than the above-mentioned components. The optional component may be a component contained in a known hair treatment agent.

[0058] Optional components may include amphoteric surfactants, cationic surfactants, esters, higher fatty acids, oils and fats, fluorine compounds, silicones, ultraviolet absorbers, antioxidants, preservatives, plant extracts, amino acids, fragrances, essential oils, pigments, water, pH stabilizers, chelating agents, solvents, anti-inflammatory agents, and gelling agents.

[0059] However, the content of the cationic polymer in the hair composition is, for example, preferably less than 1% by mass, less than 0.5% by mass, and particularly preferably less than 0.1% by mass. The cationic polymer may not be contained. An example of the cationic polymer is Polyquaternium-10.

[0060] Next, the properties of the hair composition will be described.

[0061] -Reducing power It is desirable for the hair composition to have an appropriate reducing power. The reducing power can be expressed, for example, by the amount of iodine that can be reduced by 1 g of the hair composition. More specifically, the amount of iodine that can be reduced by 1 g of the hair composition at 25°C can be expressed by the amount of 0.05 mol / L iodine solution. The amount of iodine reduced can be quantified using the iodine-starch reaction. Quantification can be performed by adding 0.05 mol / L iodine solution dropwise to a starch solution containing the hair composition at 25°C, measuring the amount of iodine solution used [mL] when the starch solution turns purple, and converting this amount used per 1 g of the hair composition. The solution may be an aqueous solution.

[0062] The reducing power of the hair composition according to this embodiment, expressed as the amount of 0.05 mol / L iodine solution reduced by 1 g of the hair composition, is preferably 2.0 mL or more, 3.0 mL or more, 5.0 mL or more, 8.0 mL or more, 8.5 mL or more, or even 9.0 mL or more. The upper limit of the reducing power is not limited to a specific value and is, for example, 30 mL, 20 mL, 15 mL, 12 mL, or even 10 mL. When component (A) is component (A2), the reducing power is preferably 5.0 mL or more. On the other hand, when component (A) is component (A1), even a relatively small reducing power can ensure the effect on hair, so the reducing power is preferably, for example, 2.0 mL or more, 3.0 mL or more, or even 3.5 mL or more.

[0063] pH The pH of the hair composition at 25°C is 3.0 or more and less than 8.0. From the viewpoint of suppressing damage to hair, the pH of the hair composition may be 3.5 or more, 4.0 or more, 5.0 or more, or even 6.0 or more. From the same viewpoint, the pH of the hair composition may be 7.8 or less, 7.5 or less, or in some cases less than 7.0. A preferred pH range is 4.0 to 7.5, particularly 5.0 or more and less than 7.0. Within this pH range, the hair composition can have high reducing power. In addition, within this pH range, the hair composition can have high stability. In other words, when the hair composition has an appropriate pH, the above-mentioned components (A) and / or (B) are less likely to precipitate.

[0064] When hair is damaged, the hair composition and hair components are more likely to leak out from the inside of the hair. In addition, when hair is damaged, it is difficult to maintain the effect of reducing voids in the medulla. By controlling the pH within an appropriate range, hair is less susceptible to damage and the duration of the effect of medulla modification is improved. Conventional perm agents can have a high pH to improve reducing power. In this case, the hair is damaged. Specifically, according to the inventors' studies, conventional perm agents can cause hair medulla to turn black medulla. With the hair composition of this embodiment, controlling the pH within an appropriate range can suppress the formation of black medulla and achieve the effect of medulla modification.

[0065] Next, the formulation of the hair composition and the hair treatment agent containing the hair composition will be described.

[0066] Dosage form The formulation of the hair composition is not particularly limited, and known formulations can be used. Preferred formulations are gel, solution, cream, aerosol, spray, or emulsion. The hair composition may be a one-component or two-component formulation. The hair composition may be a multi-component formulation, such as a three-component formulation. The viscosity of the hair composition is not limited to a specific value. If the hair composition has an appropriate viscosity, it is less likely to drip when applied to hair and can be applied evenly to the hair. This makes it easier to more reliably obtain the effects of medulla modification.

[0067] Hair treatment agent The hair composition according to the present embodiment may be used alone as a hair treatment agent, may be used as a component of various hair treatment agents, or may be used in combination with another composition as a hair treatment agent. The hair treatment agent may be a novel agent that focuses on modifying the medulla, such as a medulla filler, or may be a known hair treatment agent. Examples of known hair treatment agents include shampoo, conditioner, hair rinse, hair dye, permanent agent, hair wax, hair cream, hair essence, hair lotion, hair spray, and hair mousse. The hair treatment agent may be a non-washing hair treatment agent, such as a hair treatment agent such as a conditioner or hair rinse. The hair treatment agent may be a hair transformation agent, such as a permanent agent. The hair treatment agent may be a hair modifying agent used in combination with the first and second perm agents. The hair treatment agent may be various hair dyes, such as gray hair dyes, hair colors, and hair manicures. The hair composition according to the present embodiment is also suitable for use as a hair dye pretreatment agent, which can improve color development.

[0068] Second agent The hair treatment agent may comprise a first agent containing the hair composition according to this embodiment and a second agent containing an oxidizing agent. While the use of the second agent is not essential, using the second agent allows the components that have penetrated into the hair to remain there for a long period of time. The oxidizing agent contained in the second agent can act on disulfide bonds in the hair. Specifically, the oxidizing agent can generate disulfide bonds and inhibit the outflow of component (A) from the inside of the hair.

[0069] The oxidizing agent may be a known oxidizing agent. Examples of the oxidizing agent include hydrogen peroxide, urea peroxide, melamine peroxide, sodium percarbonate, potassium percarbonate, alkali metal bromates, and alkali metal persalts. Examples of alkali metal persalts include perbromates, persulfates, and perborates. An example of an alkali metal bromate is sodium bromate. The content of the oxidizing agent may be, for example, in the range of 1.0 to 9.0 mass% or 5.0 to 8.0 mass% relative to the total mass of the second agent.

[0070] The pH of the second agent is preferably, for example, 2.5 to 9.5, particularly 5.0 to 7.0.

[0071] When a hair treatment agent is a multi-component type, for example, the hair treatment agent may be composed of three or more treatment agents. In this case, the hair treatment agent contains one or more other treatment agents in addition to the first and second agents. The order of hair treatment with the first agent, the second agent, and one or more other treatment agents may be, for example, by using the first agent followed by the second agent, and the order of hair treatment with the other treatment agents is not limited to a specific order. In the case of a three-component type hair treatment agent, the third agent may be used before hair treatment with the first agent, between application of the first agent and application of the second agent to the hair, and / or after hair treatment with the second agent. In the case of a three-component type hair treatment agent, the third agent may contain ingredients different from the first and second agents.

[0072] Next, a method for treating hair will be described.

[0073] Hair treatment method A hair treatment method according to one embodiment of the present invention includes contacting the hair with a hair composition according to the present invention and maintaining contact of the hair with the hair composition until at least one component contained in the hair composition penetrates into the interior of the hair, thereby reducing porosity in the hair medulla.

[0074] Another embodiment of the present invention provides a hair treatment method comprising contacting hair with a hair composition containing at least one selected from the group consisting of hydrolyzed proteins, amino acids, and derivatives thereof, and maintaining contact of the hair composition with the hair until at least one component contained in the hair composition penetrates into the interior of the hair, thereby substantially filling the voids in the hair medulla.

[0075] A hair treatment method according to another embodiment of the present invention includes contacting hair having black medulla with a hair composition containing at least one selected from the group consisting of hydrolyzed proteins, amino acids, and derivatives thereof, and maintaining contact of the hair composition with the hair until the black medulla changes to white medulla.

[0076] The ingredients, properties, etc. of the hair composition that can be used in these hair treatment methods (hereinafter referred to as the hair treatment method according to this embodiment) are as described above. The criteria for determining whether medulla are substantially filled, how to handle the molecular weight of hydrolyzed proteins, etc., and the definitions of black medulla and white medulla are also as described above.

[0077] The method for contacting the hair composition with hair is not limited to a specific method. The hair composition may be applied directly to the hair by hand or using an applicator such as a comb, brush, paintbrush, or sprayer. The hair composition may be applied to dry or wet hair. The temperature of the hair composition and hair when contacting the hair is not limited to a specific value, but a temperature of room temperature (25°C) or higher is appropriate, and 35°C or higher, 40°C or higher, and particularly 45 to 60°C are more appropriate from the viewpoint of medulla filling. That is, it is preferable to contact the hair composition with the hair when the temperature of at least one selected from the group consisting of the hair composition and the hair is above room temperature, for example, 35°C or higher. Specifically, this contact can be carried out by heating the hair composition to the above temperature or by contacting the hair with water at the above temperature. This contact may be carried out by heating at least one selected from the group consisting of the hair composition and the hair while maintaining contact between the hair composition and the hair, more specifically by heating the hair to which the hair composition has been applied to the above-mentioned temperature.

[0078] Upon contact with the hair composition, the components of the hair composition act on the medulla of the hair, which can change its structure. Typically, the components of the hair composition act directly and / or indirectly on the medulla, reducing the porosity of the medulla, modifying it, and in some cases substantially filling it.

[0079] It is preferable that the contact between the hair composition and the hair be maintained for a predetermined time sufficient to modify the medulla. Furthermore, the contact between the hair composition and the hair may be maintained at room temperature (25°C) or while the hair is heated. The time for maintaining the contact varies depending on the temperature of the hair, but may be, for example, 1 minute or more, 20 minutes or more, or even 1 hour or more. The upper limit of this time is not particularly limited, and may be, for example, 24 hours or less. After the predetermined time has elapsed, the hair composition is removed. The hair composition can be removed by rinsing with water or by washing the hair with a cleanser such as shampoo. This removal is not limited to being solely for the purpose of removing the hair composition. For example, the hair composition may be applied to the hair in the morning and then removed by daily hair washing that evening. The hair can be heated to a temperature above room temperature (25°C), preferably above 40°C, particularly 45 to 60°C, or by blowing air at a temperature within this range onto the hair. Hair can be heated using, for example, a hair dryer, a hair iron, or a far-infrared accelerator. Heating the hair promotes penetration of the components of the hair composition into the hair.

[0080] The hair composition according to the present embodiment is unlikely to flow out of the hair during the hair washing procedure, meaning that the hair composition according to the present embodiment can maintain the porosity of the medulla reduced, modified, and in some cases substantially filled, even after washing the hair.

[0081] By the hair treatment method according to the present embodiment, the voids in the medulla are reduced, preferably the medulla is substantially filled, and in some cases black medulla is changed to white medulla. The hair modification by this hair treatment method restores the deepest part of the hair, and is particularly useful as part of treatments at hair salons.

[0082] In the hair treatment method according to the present embodiment, the steps of contacting the hair composition with the hair, maintaining contact between the hair composition with the hair, and removing the hair composition from the hair may be repeated multiple times in this order.

[0083] In the hair treatment method according to this embodiment, if the hair treatment agent is a two-component type, a step of removing the hair treatment agent may be included between hair treatment with the first agent and hair treatment with the second agent, or the first agent may be contacted with the hair and then the second agent may be contacted with the hair without removing the first agent. After contacting the second agent with the hair, a step of removing the second agent may be included, or the step of removing the second agent may not be included. As described above, the first or second agent can be removed by, for example, rinsing with water or washing the hair with a cleanser such as shampoo. If the hair treatment agent is a multi-component type, such as a three-component type, a step of removing the treatment agent may be included before and / or after hair treatment with each treatment agent, or the step of removing the treatment agent may not be included. [Example]

[0084] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples.

[0085] (Preparation of Hair Composition) Hair compositions according to Examples and Comparative Examples were prepared containing reduced hydrolyzed keratin, hydrolyzed keratin, hydrolyzed pea protein, hydrolyzed sesame protein, PG propylmethylsilanediol, sodium dilauroyl glutamate lysine, or PPG-2 arginine as component (A); urea, glycerin, 1,3-butylene glycol, or isopropanol as component (B); and sodium metabisulfite as component (C), in the amounts shown in Tables 1 to 3 below. The pH of the hair composition was adjusted to the desired value using NaOH or HCl. The pH of the hair composition was measured at 25°C. The notations (A) to (C) in the "Component Name" column in the tables correspond to component (A), component (B), and component (C), respectively. All units in the tables are % by mass. A "-" in the "Component" column in each table indicates that the component is not contained.

[0086] (Evaluation of reducing power) 1 g of the hair compositions according to the Examples and Comparative Examples was accurately weighed and added to a 200 mL Erlenmeyer flask. 100 mL of purified water (hereinafter simply referred to as "water") conforming to the standards for cosmetic ingredients and 5 mL of a 2.5% by weight aqueous solution of sodium laureth sulfate were added to prepare a sample solution. The sample solution was thoroughly stirred. Next, 5 mL of a 10% by weight sulfuric acid solution and 3 mL of a 0.5% by weight starch solution were added to the sample solution and thoroughly stirred to prepare a test solution. A 0.05 mol / L iodine solution was added dropwise to the test solution, and the titration volume of the iodine solution was calculated when the test solution turned purple. The titration volume [mL] of the iodine solution per 1 g of hair composition was defined as an index of reducing power. The results are shown in Tables 1 to 3.

[0087] (Evaluation of reduction of medulla voids) Human gray hair was washed with a 5% by mass aqueous solution of sodium laureth sulfate (SLS), thoroughly rinsed with hot water, and towel-dried. Hair compositions according to the Examples and Comparative Examples were applied to the human gray hair, and the hair was left to stand at the temperatures and times shown in Tables 1 to 3. A Fine compact incubator FF-12 manufactured by Tokyo Glass Instruments Co., Ltd. was used to heat the applied hair composition. The human gray hair was then washed with water. Next, the human gray hair was treated with a 7.5% by mass aqueous solution of sodium bromate and left to stand at room temperature (25°C) for 10 minutes. The human gray hair was then washed with water again. After air-drying the human gray hair, light was irradiated from the thickness direction of the human gray hair using an optical microscope manufactured by Keyence Corporation (digital microscope VHX-5000, magnification: 500x), and the light transmitted through the human gray hair was observed. The lens used was a high-resolution zoom lens VH-Z500R manufactured by Keyence Corporation. The results are shown in Figures 1 to 11. The observation results of the human gray hair before treatment are shown in Figure 12. The human gray hairs according to Comparative Examples 3, 4, 6, 9, and 10 were observed with an optical microscope without being naturally dried.

[0088] (Sustainable reduction of medulla voids) The durability of the effect of reducing medulla voids in human gray hair treated with the hair composition was evaluated. In the human gray hair prepared as described above (evaluation of reduction of medulla voids), if the reduction in medulla voids could be confirmed using an optical microscope and the reduction in medulla voids was maintained even after the human gray hair was subsequently washed with a 5% by mass SLS aqueous solution, the evaluation was "◎". In the human gray hair prepared as described above (evaluation of reduction of medulla voids), if the reduction in medulla voids could be confirmed using an optical microscope, but if the human gray hair was subsequently washed with a 5% by mass SLS aqueous solution, the reduction in medulla voids could not be substantially confirmed, the evaluation was "○". In the above (evaluation of reduction in medulla voids), if a slight reduction in medulla voids was confirmed before the human gray hair was air-dried, but no reduction in medulla voids was confirmed after the human gray hair was air-dried, the case was evaluated as "△." If no reduction in medulla voids was confirmed when the human gray hair was prepared in the above (evaluation of reduction in medulla voids), and if no reduction in medulla voids was confirmed even after the human gray hair was subsequently washed with a 5% by mass SLS aqueous solution, the case was evaluated as "×."

[0089] (Evaluation of gray hair visibility) The human gray hair treated as described above was visually evaluated for the visibility of gray hair. A rating of "◎" was given for "transparency, making gray hair very inconspicuous," "◯" for "slight transparency, making white hair inconspicuous," "△" for "no change from before treatment," and "×" for "white hair more noticeable than before treatment." The results are shown in Tables 1 to 3.

[0090] (Evaluation of hair bundle texture) A hair bundle containing 10% human gray hair was washed with a 5% by mass aqueous solution of sodium laureth sulfate (SLS), rinsed thoroughly with warm water, and towel-dried. The hair compositions according to the Examples and Comparative Examples were applied to the hair bundle and allowed to react at the treatment temperatures and times listed in Tables 1 to 3. The hair bundle was then rinsed with water. The hair bundle was then treated with a 7.5% by mass aqueous solution of sodium bromate and allowed to stand for 10 minutes at room temperature (25°C). The hair bundle was then rinsed again with water and air-dried. Ten expert evaluators rated the texture of the hair bundle on a 5-point scale (1 to 5). For each evaluation item of the texture of the hair bundle, 5 was assigned to "very good," 4 to "good," 3 to "average," 2 to "not very good," and 1 to "poor." Regarding the texture of the hair bundle, if the average score of 10 expert evaluators was 4.0 or more, they were evaluated as "◎", if it was 3.0 or more but less than 4.0, they were evaluated as "○", if it was 2.0 or more but less than 3.0, they were evaluated as "△", and if it was 2.0 or less, they were evaluated as "×". The results are shown in Tables 1 to 3. The texture of the hair bundle refers to "luster", "body and stiffness", and "management".

[0091] In the following tables, the average molecular weight is the weight average molecular weight for reduced hydrolyzed keratin, and the number average molecular weight for the others.

[0092] [Table 1]

[0093] [Table 2]

[0094] [Table 3]

[0095] In each example, the voids in the medulla were reduced, the medulla were substantially filled, and the black medulla was transformed into white medulla (see Figures 1 to 4). On the other hand, in each comparative example, the medulla could not be sufficiently modified (see Figures 5 to 11). These medulla remained as black medulla. As shown in Figure 7, the hair composition of Comparative Example 5 resulted in hair with a whitish core. Because the hair composition of Comparative Example 5 is alkaline, it is believed that the hair, particularly the cuticle, was damaged, and the hair composition penetrated into the hair. As a result, it is believed that the hair with a whitish core was obtained. However, in hair treated with the hair composition of Comparative Example 5, light scattering on the hair surface was increased, and gray hair was more noticeable than before treatment. In addition, the hair composition of Comparative Example 5 was prone to damage, so the hair composition was prone to flow out of the hair, and the effect of reducing the voids in the medulla was not sufficiently sustained. Therefore, it is difficult to say that the hair composition of Comparative Example 5 modified the inside of the hair.

[0096] Next, the hair compositions according to Example 2 and Comparative Examples 3, 5, and 9 were evaluated for dyeability in a hair color treatment and for suppression of frizz in a straight design treatment.

[0097] (Evaluation of dyeability by hair color treatment) A commercially available hair tress (10 cm long, 1 g, manufactured by Beaulux) containing 50% gray hair was washed with a 5% by weight aqueous solution of sodium laureth sulfate (SLS), thoroughly rinsed with hot water, and then towel-dried. The hair tress was reacted with the hair compositions of Example 2, Comparative Example 3, and Comparative Example 9 at 50°C for 20 minutes. The hair tress was then rinsed with water. Next, the hair tress was treated with a 7.5% by weight aqueous solution of sodium bromate and allowed to stand at room temperature (25°C) for 10 minutes. The hair tress was then rinsed again with water and air-dried. Next, 4 g of a basic hair dye ("Rocol Indigo" manufactured by Takara Belmont) was applied to each tress and allowed to stand at room temperature for 20 minutes. The hair tress was then thoroughly rinsed with water and air-dried. Ten expert evaluators evaluated the dyeability (color intensity) of the hair tress using a 5-point scale (1 to 5). The dyeability of the hair bundles was rated as 5 for "very good", 4 for "good", 3 for "average", 2 for "not very good", and 1 for "poor". The dyeability of the hair bundles was rated as "◎" when the average score of 10 expert evaluators was 4.0 or higher, "○" when it was 3.0 or higher but less than 4.0, "△" when it was 2.0 or higher but less than 3.0, and "×" when it was 2.0 or lower. The results are shown in Table 4.

[0098] (Surface undulation suppression evaluation by straight design processing) Commercially available frizzy hair (20 cm long, 1.5 g, manufactured by INTERNATIONAL HAIR IMPORTERS & PRODUCTS) was washed with a 5% by weight aqueous solution of sodium laureth sulfate (SLS), rinsed thoroughly with hot water, and towel-dried. The hair bundle was then treated with the hair compositions of Example 2 and Comparative Example 5 at 50°C for 20 minutes. The hair bundle was then rinsed with water and dried with a hair dryer. The hair bundle was then clamped with a straightening iron set at 180°C and moved twice from the roots to the ends over a set period of time. The hair bundle was then treated with a 7.5% by weight aqueous solution of sodium bromate and allowed to stand at room temperature (25°C) for 10 minutes. The hair bundle was then rinsed again with water and allowed to air-dry. Ten expert evaluators evaluated the frizz-suppressing effect of the hair bundle on a 5-point scale (1 to 5). The effect of suppressing hair strand frizz was rated as 5 for "very good", 4 for "good", 3 for "average", 2 for "not very good", and 1 for "poor". The average score of 10 expert evaluators for the effect of suppressing hair strand frizz was rated as "◎" if it was 4.0 or more and less than 4.0, "○" if it was 3.0 or more and less than 3.0, "△" if it was 2.0 or more and less than 3.0, and "×" if it was 2.0 or less. The results are shown in Table 4.

[0099] [Table 4]

[0100] In Example 2, the hair bundle was dyed well (FIG. 13). On the other hand, in Comparative Examples 3 and 9, the dyeability of the hair bundle was somewhat poor. Furthermore, in Example 2, hair frizz was well suppressed (FIG. 14). On the other hand, in Comparative Example 5, the effect of suppressing hair frizz was somewhat poor. It was found that the hair composition according to the present invention is excellent in dyeability by hair color treatment and suppression of frizz by straight design treatment.

Claims

1. A hair composition containing the following components (A) and (B), with a pH of 3.0 or higher and less than 8.0 at 25°C, is brought into contact with the hair. Hair treatment methods. (A) At least one selected from the group consisting of reduced hydrolyzed proteins and their derivatives having a molecular weight of 5,000 or more and 50,000 or less that can act as a reducing agent (provided that the derivative is a reduced hydrolyzed protein that has undergone at least one chemical modification selected from the group consisting of silylation, acylation, and cationization). (B) Penetrating agent

2. A hair composition containing the following components (A) to (C) and having a pH of 3.0 or higher and less than 8.0 at 25°C is brought into contact with the hair. Hair treatment methods. (A) At least one selected from the group consisting of hydrolyzed proteins and derivatives thereof having a molecular weight of 10,000 or more and 50,000 or less (provided that the derivative is a hydrolyzed protein that has undergone at least one chemical modification selected from the group consisting of silylation, acylation, and cationization). (B) Penetrating agent containing urea (C) Reducing agent

3. The hair treatment method according to claim 1 or 2, further comprising maintaining contact between the hair composition and the hair until at least one component contained in the hair composition penetrates into the hair, thereby substantially filling the medulla of the hair.

4. The hair has a black medulla, A hair treatment method according to any one of claims 1 to 3, further comprising maintaining contact between the hair composition and the hair until the black medulla changes into a white medulla.

5. A hair treatment method according to any one of claims 1 to 4, comprising bringing the hair composition and the hair into contact at least one temperature selected from the group consisting of the hair composition and the hair, where the temperature is 35°C or higher.

6. A hair treatment method according to any one of claims 1 to 5, comprising heating at least one selected from the group consisting of the hair composition and the hair while maintaining contact between the hair composition and the hair.

7. The hair treatment method according to any one of claims 1 to 6, wherein the hair includes gray hair.

8. comprising the following components (A) and (B), The pH at 25°C is 3.0 or higher and less than 8.

0. Composition for hair. (A) At least one selected from the group consisting of reduced hydrolyzed proteins and their derivatives having a molecular weight of 5,000 or more and 50,000 or less that can act as a reducing agent (provided that the derivative is a reduced hydrolyzed protein that has undergone at least one chemical modification selected from the group consisting of silylation, acylation, and cationization). (B) Penetrating agent

9. comprising the following components (A) to (C): The pH at 25°C is 3.0 or higher and less than 8.

0. Composition for hair. (A) At least one selected from the group consisting of hydrolyzed proteins and derivatives thereof having a molecular weight of 10,000 or more and 50,000 or less (provided that the derivative is a hydrolyzed protein that has undergone at least one chemical modification selected from the group consisting of silylation, acylation, and cationization). (B) Penetrating agent containing urea (C) Reducing agent

10. The hair composition according to claim 8 or 9, wherein at 25°C, the amount of iodine reduced by 1 g of the hair composition is 2.0 mL or more, expressed as the amount of a 0.05 mol / L iodine solution.

11. The hair composition according to any one of claims 8 to 10, wherein at 25°C, the amount of iodine reduced by 1 g of the hair composition is 5.0 mL or more, expressed as the amount of a 0.05 mol / L iodine solution.

12. The hair composition according to any one of claims 8 to 11, wherein the content of component (A) relative to the total mass of the hair composition is 5% by mass or more and 15% by mass or less.

13. The hair composition according to claim 12, wherein the content of component (A) relative to the total mass of the hair composition is 5.5% by mass or more and 15% by mass or less.

14. A medulla filler comprising the hair composition described in any one of claims 8 to 13.

15. A gray hair treatment agent comprising the hair composition described in any one of claims 8 to 13.

16. A first agent comprising the hair composition according to any one of claims 8 to 13, A hair treatment agent comprising a second agent containing an oxidizing agent.

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