hair treatment agent

Abstract

To provide a hair treatment agent that is easy to handle during its application, prevents the agent from getting dry on the hair from the start to finish of the application, allows the agent to be easily rinsed, and gives the finished hair an improved texture.SOLUTION: A hair treatment agent is used for hair bleach or oxidative dying, containing (A) at least one polyhydric alcohol of 0.5-5.0 wt.%, (B) xanthan gum of 0.15-0.5 wt.%, and (C) at least one cationic surfactant of 0.25 wt.% or more, with the weight ratio (C) / (B) of 1.0-3.5.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a hair treatment agent used, for example, for hair treatment (hair bleaching or oxidative hair dyeing). [Background technology]

[0002] There are hair dyes (hair treatments used for oxidative hair dyeing) that use a mixture of a first agent containing an oxidative dye and an alkaline agent and a second agent containing an oxidizing agent. When this hair dye is applied to hair, the alkaline agent swells the hair, increasing the penetration of the oxidative dye. It also reacts with the oxidizing agent (e.g., hydrogen peroxide), causing the melanin in the hair to break down and the oxidative dye to develop color, resulting in hair dyeing. Furthermore, if the first agent does not contain an oxidative dye, it functions as a hair bleach (hair treatment used for hair bleaching). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-31441 [Patent Document 2] Patent No. 5314361 [Patent Document 3] Japanese Patent Application Laid-Open No. 2008-290954 [Patent Document 4] Patent No. 5303099 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned hair treatments are prone to causing hair damage, and if stress is applied to the hair due to combing stress during treatment, hair damage becomes even more pronounced. Furthermore, if the hair treatment is not rinsed off sufficiently after application, hair damage becomes even more severe. Furthermore, since application of a hair treatment typically takes approximately 10 to 20 minutes, once the hair treatment dries in the area where it was first applied, it becomes difficult to handle, placing stress on the hair and further damaging the hair. For this reason, hair bleached or dyed with a hair treatment is typically finished with a shampoo and conditioner to treat the damage. However, while Patent Documents 1 to 4 each disclose the incorporation of ingredients such as cationic polymers to improve operability during application and rinsing, they do not take into consideration the operability for damaged hair or the texture after treatment, leaving room for improvement.

[0005] For example, Patent Document 1 describes a first agent of an oxidative hair dye that is easily applied evenly and blends well with hair due to the oil and fat content of the formulation, while Patent Document 2 describes an oxidative hair dye that is less likely to cause uneven dyeing or damage to hair due to the use of quaternary ammonium salts, and that is easy to pick up with a brush during the dyeing process and spreads easily when applied to hair due to the use of fatty acid glyceryl esters and / or specific polyoxyethylene-polyoxypropylene alkyl ethers.

[0006] However, Patent Documents 1 and 2 do not take into consideration the drying of the hair treatment agent on the hair from the start to the end of application and the deterioration of operability due to this drying. Therefore, when trying to blend the agent evenly over the entire hair at the end of application (approximately 20 minutes after the start of application), the agent may dry out, resulting in deterioration of operability.

[0007] Furthermore, Patent Document 3 describes an oxidative hair dye or bleach that, by incorporating a highly polymerized silicone and a cationic polymer, provides an excellent feel at all stages of the process, from rinsing with running water after hair treatment, to shampooing, and drying. However, the finished texture is evaluated after shampooing, and no evaluation of texture after treatment is described. In order to improve texture, the incorporation of a cationic polymer has been considered, but this can affect the texture after treatment, and the problem has not been solved satisfactorily.

[0008] Patent Document 4 describes hair dyes and hair bleaches that contain polyhydric alcohols to prevent deterioration of combing performance over time. However, it does not evaluate the combing performance over time on damaged hair. Furthermore, like Patent Document 3, the finished texture is evaluated after shampooing, and no evaluation of texture after treatment is described.

[0009] The present invention has been made in consideration of the above matters, and an object of the present invention is to provide a hair treatment agent that is easy to use when applied, prevents the agent from drying on the hair from the start to the end of application, and is easy to rinse off, thereby improving the texture of the finished hair. [Means for solving the problem]

[0010] In order to achieve the above object, the hair treatment composition of the present invention is a hair treatment composition used for hair bleaching or oxidative hair dyeing, and comprises (A) 0.5 to 5.0% by weight of at least one polyhydric alcohol, (B) 0.15 to 0.5% by weight of xanthan gum, and (C) 0.25% by weight or more of at least one cationic surfactant, with a weight ratio (C) / (B) of 1.0 to 3.5. The alkaline agent content is 0.1 to 5.0% by weight, and ammonia and ammonium bicarbonate are used in combination as the alkaline agent, with the weight ratio of ammonium bicarbonate to ammonia being greater than 1 / 10 and less than 10 / 1. (Claim 1).

[0011] In the above hair treatment agent, (A) may contain at least one selected from glycerin, propylene glycol, 1,3-butylene glycol, and dipropylene glycol (claim 2).

[0012] In the above hair treatment agent, (C) may be at least one selected from alkyltrimethylammonium chloride, dialkyldimethylammonium chloride, alkyltrimethylammonium bromide, and dialkyldimethylammonium bromide (claim 3).

[0013] In the above hair treatment agent, (C) may be selected from cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, and behenyltrimethylammonium chloride (claim 4). [Effects of the Invention]

[0014] The present invention provides a hair treatment agent that is easy to use during application, prevents the chemicals from drying out on the hair from start to finish of application, and is easy to rinse off, improving the texture of the finished hair. In particular, if the hair is damaged, the hair treatment agent will penetrate into the hair when applied, reducing the amount of hair treatment agent on the hair surface and making the hair more prone to drying, which in turn reduces the smoothness of the hair surface. Therefore, the more damaged the hair, the more easily the above-mentioned effects can be obtained. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of the present invention will be described below.

[0016] The hair treatment agent of this example is a hair dye (hair treatment agent used for oxidative hair dyeing) that is used by mixing a first agent containing an oxidative dye and an alkaline agent with a second agent containing an oxidizing agent (such as hydrogen peroxide); if the first agent does not contain an oxidative dye, it functions as a hair bleach (hair treatment agent used for hair bleaching). In other words, the hair treatment agent of this example can be used as a hair dye by including an oxidative dye in the first agent, or as a hair bleach by not including an oxidative dye in the first agent, and therefore can be considered a (two-component) hair bleach / color agent. Note that the hair treatment agent of this example is used, for example, by mixing the first agent and the second agent immediately before use and then applying the mixture to the hair.

[0017] The hair treatment agent of this example is designed to satisfy the following conditions (hereinafter referred to as formulation conditions) when in use (when applied to hair) (in other words, in the mixture of the first and second agents): (A) 0.5 to 5.0 wt % of at least one polyhydric alcohol, (B) 0.15 to 0.5 wt % of xanthan gum, and (C) 0.25 wt % or more of at least one cationic surfactant, with a weight ratio (C) / (B) of 1.0 to 3.5.

[0018] (A) The at least one polyhydric alcohol includes glycerins such as glycerin and diglycerin, and glycols such as 1,3-butylene glycol and dipropylene glycol, of which glycerin, propylene glycol, 1,3-butylene glycol, and dipropylene glycol are particularly preferred.

[0019] The content of (A) polyhydric alcohol is set to 0.5 to 5.0 wt % from the viewpoint of suppressing drying of the drug, and 1.5 to 4.0 wt % is particularly preferable. If it is less than 0.5 wt %, it will not be effective in preventing drying of the drug, and if it exceeds 5.0 wt %, it will affect bleaching and dyeing properties.

[0020] The content of (B) xanthan gum is set to 0.15 to 0.5 wt. % from the viewpoint of improving ease of application and the feel after treatment, but 0.25 to 0.4 wt. % is preferred. Less than 0.15 wt. % does not provide sufficient effect on ease of application, while more than 0.5 wt. % increases the viscosity of the formulation, affecting ease of application and rinsing. While the first formulation is typically pH 9 to 10 and the second formulation is typically pH 2 to 4 for the stability of hydrogen peroxide, xanthan gum has the advantage of being less affected by such a wide pH range in terms of viscosity and properties.

[0021] (C) The at least one cationic surfactant includes alkyltrimethylammonium chloride, dialkyldimethylammonium chloride, alkyltrimethylammonium bromide, and dialkyldimethylammonium bromide, and among these, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, and behenyltrimethylammonium chloride are particularly preferred.

[0022] (C) Cationic surfactant is blended for the purposes of improving operability during application and providing a supple feel after treatment. The content is set to 0.25% by weight or more, with 0.5% by weight or more being particularly preferred. Furthermore, even if the content is 1.5% by weight or more, no further effects can be expected.

[0023] The weight ratio (C) / (B) of component (C) to component (B) is preferably 1.0 to 3.5, and more preferably 1.5 to 2.0, to facilitate rinsing of the drug. If the weight ratio (C) / (B) is less than 1.0 or more than 3.5, the drug will not be easily rinsable.

[0024] The mixing ratio of the first and second agents is adjusted appropriately to achieve the desired hair color. For example, a weight ratio of 2:1 to 1:3 (first agent:second agent) is considered, with a 1:1 to 1:3 ratio being particularly preferable, and a 1:1 to 1:2 ratio being even more preferable. However, regardless of this mixing ratio, the mixture of the first and second agents (the hair treatment product when used) only needs to satisfy the above-mentioned formulation conditions, and the amounts of the above components (A) to (C) contained in each of the first and second agents can be determined arbitrarily. For example, when the first and second agents are mixed in a 1:1 weight ratio, as long as one of the first and second agents contains 1.0 to 10.0 wt. % of component (A), 0.3 to 1.0 wt. % of component (B), and 0.5 wt. % or more of component (C), and the weight ratio (C) / (B) is 1.0 to 3.5, the other agent can be free of components (A) to (C).

[0025] The first and second agents usually contain water. The amount of water is not particularly limited and can be adjusted appropriately depending on the purpose of use. Specific examples of water include tap water, ion-exchanged water, distilled water, purified water, and natural water, with sterilized water being preferred. The dosage form of the first and second agents can be, for example, liquid, cream, gel, etc.

[0026] Examples of alkaline agents contained in the first agent include ammonia and ammonium bicarbonate. The content of the alkaline agent in the mixture of the first and second agents is 0.05 to 5.0 wt%, with 0.5 to 4.0 wt% being more preferred. An alkaline content of less than 0.1 wt% fails to provide sufficient hair swelling, bleaching power, or oxidative polymerization of the dye. An alkaline content of more than 5.0 wt% only increases the primary skin irritation and hair damage caused by the alkaline and oxidizing agents, with little effect on bleaching or dye fixation. Using a combination of ammonia and ammonium bicarbonate or their salts as alkaline agents is particularly preferred in terms of reducing the primary skin irritation caused by the alkaline and oxidizing agents and reducing irritating odors. If the weight ratio of ammonium bicarbonate to ammonia (weight of ammonia / weight of ammonium bicarbonate) is less than 1 / 10, the stability of ammonium bicarbonate deteriorates. If the weight ratio is more than 10 / 1, there is little effect in reducing the primary skin irritation caused by the alkaline and oxidizing agents. Other alkaline agents that may be used include monoethanolamine, aminomethylpropanol, monoisopropanolamine, sodium hydroxide, potassium hydroxide, ammonium chloride, and the like, in small amounts, or in combination of two or more of these, taking into consideration damage to the hair.

[0027] Examples of oxidizing agents contained in the second agent include hydrogen peroxide, bromates, percarbonates, and perborates. The content of the oxidizing agent in the mixture of the first and second agents is 0.25 to 5.0% by weight, and more preferably 1.5 to 4.0% by weight. If the oxidizing agent content is less than 0.25% by weight, sufficient bleaching power and dyeing effect cannot be obtained, and if it exceeds 5.0% by weight, it will cause severe damage to the hair, which is not preferable.

[0028] Examples of oxidation dyes contained in the first agent include 2,2'-[(4-aminophenyl)imino]bisethanol sulfate, 5-aminoorthocresol, 1-amino-4-methylaminoanthraquinone, 3,3-iminodiphenol, 2,4-diaminophenoxyethanol, 2,4-diaminophenol, toluene-2,5-diamine, toluene-3,4-diamine, nitroparaphenylenediamine, paraphenylenediamine, N-phenylparaphenylenediamine, metaphenylenediamine, orthoaminophenol, 1,4-diaminoanthraquinone, 2,6-diaminopyridine, 1,5-hydroxynaphthalene, paraaminophenol, and paranitrophenylenediamine. Examples of suitable dyes include methylaminophenol, methylphenylenediamine, paramethylaminophenol, picramic acid, sodium picramate, N,N-bis(4-aminophenyl)-2,5-diamino-1,4-quinonediimine, 5-(2-hydroxyethylamino)-2-methylphenol, meta-aminophenol, meta-phenylenediamine, orthochloroparaphenylenediamine, 4,4-diaminodiphenylamine, catechol, diphenylamine, α-naphthol, hydroquinone, pyrogallol, phloroglucin, gallic acid, resorcinol, and their salts such as hydrochlorides, sulfates, and acetates, and direct dyes, which can be used alone or in combination of two or more. The content of the dye in the mixture of the first and second agents is preferably 0.005 to 7.5 wt %, and more preferably 0.05 to 5.0 wt %. If the content of the oxidation dye is less than 0.005% by weight, it is difficult to obtain sufficient hair dyeing power, and even if it exceeds 7.5% by weight, it is difficult to obtain any further hair dyeing power.

[0029] At least one of the first and second agents may contain a polyoxyethylene alkyl ether. Specific examples of effective polyoxyethylene alkyl ethers include polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, and polyoxyethylene behenyl ether, and at least one or a combination of two or more may be used. The content of polyoxyethylene alkyl ether in the mixture of the first and second agents is preferably 1.0 to 6.0% by weight, and more preferably 2.0 to 4.0% by weight. If the content of polyoxyethylene alkyl ether is less than 1.0% by weight, an emulsified state cannot be formed, and if the content exceeds 6.0% by weight, the effect remains unchanged.

[0030] At least one of the first and second agents may contain a higher alcohol. Specific examples of effective higher alcohols include cetyl alcohol, cetostearyl alcohol, stearyl alcohol, and behenyl alcohol, and at least one or two or more may be used in combination. The content of the higher alcohol in the mixture of the first and second agents is preferably 2.0 to 15.0 wt%, particularly 4.0 to 10.0 wt%. If the higher alcohol content is less than 2.0 wt%, an emulsified state cannot be formed. If the content exceeds 15.0 wt%, the viscosity increases, making handling difficult when mixing the first and second agents, poor spreadability during application, and inconvenience in use. Among higher alcohols with 16 or more carbon atoms, linear cetyl alcohol, stearyl alcohol, behenyl alcohol, and the like are preferred over alkenyl-containing oleyl alcohol and side-chain isostearyl alcohol.

[0031] An anionic surfactant may be contained in at least one of the first and second agents. Specific examples of effective anionic surfactants include sodium N-stearoylmethyl taurate, sodium cetyl sulfate, sodium stearyl sulfate, polyoxyethylene cetyl ether sodium sulfate, polyoxyethylene stearyl ether sodium sulfate, and other salts, and one or more of these may be used in combination. The content of the anionic surfactant in the mixed solution of the first and second agents is 0.01 to 1.5 wt%, and more preferably 0.03 to 0.75 wt%. If the content of the anionic surfactant is less than 0.01 wt%, no further effect can be obtained, while if it exceeds 1.5 wt%, it is difficult to reduce the irritating odor caused by ammonia.

[0032] The hair treatment agent (first and second agents) of this example may contain any optional components as long as they do not impair the effects of the present invention. Examples of optional components include solubilizers, water-soluble polymers, pH adjusters, sugars, plant extracts, stabilizers, humectants, herbal medicines, sequestering agents (chelating agents), preservatives, antioxidants, cooling agents, antistatic agents, vitamins, proteins, fragrances, antibacterial agents, pigments, solvents, ester oils, and thickeners. Furthermore, the hair treatment agent of this example may contain oily components other than those mentioned above, surfactants such as nonionic surfactants (the blending concentration is, for example, 1.0 to 6.0% by weight based on the total weight of the first and second agents), and the like, as long as they do not impair the effects of the present invention.

[0033] On the other hand, silicone compounds having an amodimethicone skeleton are adsorbed onto the hair during application of the hair treatment agent and may affect the texture of the finished product (treatment). Therefore, it is preferable that they are not included in the hair treatment agent (first agent, second agent) of this example, or that only a small amount is used.

[0034] Furthermore, although cationic polymers are easy to apply to hair, they may affect the texture of the finished hair (after treatment), so it is preferable that they are not included in the hair treatment agent (first agent, second agent) of this example, or that only a small amount is used.

[0035] The hair treatment agent of this example configured as described above is easy to use when applied, prevents the agent from drying out after application to the hair, and is easy to rinse off, resulting in an improved texture when finished.

[0036] Treatment using the hair treatment agent of this example can be carried out, for example, by the following procedure. First, the first agent and the second agent are mixed. Next, the mixture is applied with a brush so as to cover the entire hair, and then left to stand for 20 to 40 minutes at a temperature of 20 to 30°C. Thereafter, the hair is rinsed with hot water at 30 to 40°C, and treated with a shampoo and a treatment agent, whereby the hair can be dyed or bleached to the desired color using the hair treatment agent of this example. [Example]

[0037] The present invention will be described in detail below with reference to examples, but the present invention is not limited thereto. The blending amounts are expressed in % by weight unless otherwise specified.

[0038] (First agent) <Examples 1 to 8> As the first agent constituting the hair treatment agent (oxidation hair dye) of the present invention, a total of eight first agents having the compositions shown in Examples 1 to 8 in Table 1 below were prepared.

[0039] <Comparative Examples 1 to 8> Furthermore, for comparison, a total of eight first agents each having the composition shown in Comparative Examples 1 to 8 in Table 2 below were prepared as first agents constituting hair treatment agents (oxidation hair dyes).

[0040] (Second agent) A common second agent to be mixed with each of the first agents in Examples 1 to 8 and Comparative Examples 1 to 8 was prepared by blending raw materials in water at concentrations of 6% by weight hydrogen peroxide, 4% by weight stearyl alcohol, 2% by weight petrolatum, and 2% by weight polyoxyethylene stearyl ether.

[0041] (hair treatment agent) The first agents of Examples 1 to 8 and Comparative Examples 1 to 8 were mixed with the common second agent in a weight ratio of 1:1 to obtain hair treatments of the Examples and Comparative Examples. The hair treatments were in cream form and had a pH in the range of 9.0 to 10.0.

[0042] [Table 1]

[0043] [Table 2]

[0044] <Creating hair bundles for evaluation> A bleaching agent made by mixing Tamaris Powder Bleach (manufactured by Tamari Chemical Co., Ltd.) and Creative Ferrier Color Oxide 6% (manufactured by Tamari Chemical Co., Ltd.) in a 1:2 (weight ratio) was applied to a hair tress (Staffs Co., Ltd. "1g, 10cm") and left at 30°C for 30 minutes, then rinsed with water and dried. This process was repeated twice to obtain the hair tress for evaluation.

[0045] <Ease of application> The ease of application was evaluated by sensory evaluation using the following three-point scale when 5.0 g of the hair treatment agent of each Example and Comparative Example was applied to a strand of hair with a brush. Good: Spreads easily when applied and can be applied evenly to the entire surface. △: It feels a bit difficult to spread when applied, but it can be applied evenly to the entire surface. ×: Spreading is poor when applied, making it difficult to apply evenly over the entire surface.

[0046] <Evaluation of drug drying> The drying of the agent was evaluated by visually checking whether the agent had dried 20 minutes after applying 5.0 g of the hair treatment agent of the Examples and Comparative Examples to a strand of hair with a brush, and rating it on the following three-point scale. ○: Moisturizing and prevents dryness. △: Not very moisturizing and dry. ×: No moisture and dry.

[0047] <Evaluation of drug combing> The combing evaluation of the agents was carried out by applying 5.0 g of the hair treatment agents of the Examples and Comparative Examples to a tress with a brush, and then 20 minutes later, the combing stress was evaluated by sensory evaluation using the following three-point scale. ○: No combing stress. △: Slight combing stress. ×: Combing stress is felt.

[0048] <Hair dye evaluation> The hair dyeing evaluation was carried out by applying 5.0 g of the hair treatment agent of the Examples and Comparative Examples to a strand of hair with a brush, leaving it at 30°C for 30 minutes, rinsing with water, drying, and visually checking the degree of dyeing, and rating it on the following three-point scale. ○: Dyed. △: The staining is a little light. ×: Staining is weak.

[0049] <Medicine rinsing evaluation> To evaluate the rinsing of the agents, 5.0 g of the hair treatment agents of the Examples and Comparative Examples were applied to a strand of hair with a brush, left to stand at 30°C for 30 minutes, and then rinsed with water. The ease of rinsing was evaluated using a sensory evaluation based on the following three-point scale. ○: Easy to rinse. △: A little difficult to rinse. ×: Difficult to rinse.

[0050] <Hair texture evaluation> The feel of the hair was evaluated by applying 5.0 g of the hair treatment agent prepared in each of the Examples and Comparative Examples to a strand of hair with a brush, leaving it at 30°C for 30 minutes, rinsing with water, washing with Tamaris Pro-use Shampoo (manufactured by Tamari Chemical Co., Ltd.), and treating with Tamariris Pro-use Conditioner (manufactured by Tamari Chemical Co., Ltd.). The feel of the hair after drying was evaluated by sensory evaluation using the following three-point scale. ○: No dryness or stiffness. △: A little dry and stiff. ×: Dry and stiff.

[0051] As is clear from the evaluation results in Table 1 above, the hair treatment agents prepared using the first agents of Examples 1 to 8 according to the present invention were formulated to satisfy the above-mentioned blending conditions, i.e., Contains only 0.5 to 5.0% by weight of glycerin as component (A), (B) Contains 0.15 to 0.5% by weight of xanthan gum, (C) contains 0.25% by weight or more of stearyltrimethylammonium chloride as a component, The weight ratio (C) / (B) is adjusted to a range of 1.0 to 3.5, which makes it easy to use when applying, prevents the agent from drying out after application to the hair, and makes it easy to rinse off, improving the texture of the finished product.

[0052] On the other hand, as is clear from the results in Table 2 above, the following is evident about the hair treatment agents prepared with the first agents of Comparative Examples 1 to 8.

[0053] The hair treatment agent prepared with the first agent of Comparative Example 1 does not contain glycerin, which is component (A), and does not contain any other component (A). In other words, the content of component (A) is less than 0.5% by weight. This means that the agent dries out and affects combing stress after application.

[0054] The hair treatment agent prepared with the first agent of Comparative Example 2 contained 7.5 (= 15.0 / 2) wt % of glycerin (component (A)), which exceeds 5.0 wt %, and therefore is known to affect hair dyeing.

[0055] The hair treatment agent prepared with the first agent of Comparative Example 3 does not contain component (B), xanthan gum, and the amount is less than 0.15% by weight. This not only makes application difficult, but also affects combing stress after application and rinsing of the agent.

[0056] The hair bleach composition and hair dye composition first agent prepared with the first agent of Comparative Example 4 contained 1.0 (=2.0 / 2) wt % xanthan gum, component (B), which exceeds 0.5 wt %, and therefore it was found that this affected the ease of application and the rinsability of the agent.

[0057] The hair treatment agent prepared with the first agent of Comparative Example 5 does not contain stearyltrimethylammonium chloride, component (C), and the amount is less than 0.25% by weight. This means that the agent dries out, causing poor combing stress after application and affecting the rinsing of the agent and the finished feel.

[0058] The hair treatment agents prepared with the first agent of Comparative Examples 6 and 7 have a weight ratio (C) / (B) of component (B) xanthan gum and component (C) stearyltrimethylammonium chloride of greater than 3.5, which is found to affect rinsing of the agent.

[0059] The hair treatment agent prepared with the first agent of Comparative Example 8 has a weight ratio (C) / (B) of component (B) xanthan gum and component (C) stearyltrimethylammonium chloride of less than 1.0, which is found to affect the rinsing of the agent.

[0060] Here, the top four components of each of the first agents in Tables 1 and 2 (toluene-2,5-diamine sulfate, meta-aminophenol, para-aminophenol, and resorcinol) are all oxidation dyes, and the hair treatment agents obtained by mixing the first and second agents in Examples 1 to 8 and Comparative Examples 1 to 8 above are hair colorants. When the first agents in Examples 1 to 8 and Comparative Examples 1 to 8 do not contain the above four components, i.e., the oxidation dyes, the hair treatment agents obtained by mixing the first and second agents become hair bleaches, and similar results to those in Tables 1 and 2 were obtained with each of these hair bleaches. To avoid repetition, detailed explanations thereof will be omitted.

[0061] It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the following modifications can be mentioned.

[0062] In the above embodiment, the case where the hair treatment agent is a two-component type has been described, but the hair treatment agent is not limited to a two-component type, and may be a one-component type or a multi-component type of three or more components.

[0063] It goes without saying that the modifications given in this specification may be combined as appropriate.

Claims

1. A hair treatment agent for use in hair bleaching or oxidative dyeing, comprising: (A) 0.5 to 5.0 wt % of at least one polyhydric alcohol; (B) 0.15 to 0.5 wt % of xanthan gum; and (C) 0.25 wt % or more of at least one cationic surfactant, wherein the weight ratio (C) / (B) is 1.0 to 3.5; the content of an alkaline agent is 0.1 to 5.0 wt %; and ammonia and ammonium bicarbonate are used in combination as the alkaline agent, with the weight ratio of ammonium bicarbonate to ammonia being greater than 1 / 10 and less than 10 / 1.

2. 2. The hair treatment agent according to claim 1, wherein (A) comprises at least one selected from glycerin, propylene glycol, 1,3-butylene glycol, and dipropylene glycol.

3. 3. The hair treatment agent according to claim 1, wherein (C) is at least one selected from alkyltrimethylammonium chloride, dialkyldimethylammonium chloride, alkyltrimethylammonium bromide, and dialkyldimethylammonium bromide.

4. The hair treatment agent according to claim 1 or 2, wherein (C) is selected from the group consisting of cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, and behenyltrimethylammonium chloride.

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