Hair treatment agent

Abstract

To provide a hair treatment agent that enables reduction of hair dyeing time, suppression of hair damage, and enhancement of strength (body, firmness, and combing smoothness) and feel (softness) of hair following dyeing treatment.SOLUTION: A hair treatment agent contains, as component (A), a zinc salt, and, as component (B), a chelating agent, where the content of component (A) is 0.001 mass% or more and 5 mass% or less, and the content of component (B) is 0.001 mass% or more and 5 mass% or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a hair treatment agent used in hair treatments such as dyeing and bleaching. [Background technology]

[0002] Two-component oxidative hair dyes consist of a first component (first hair treatment agent) containing an oxidative dye and an alkaline agent such as ammonia, and a second component (second hair treatment agent) containing an oxidizing agent.The first component is adjusted to be alkaline, and the second component is adjusted to be acidic, and the first and second components are mixed together before use.

[0003] When the first and second agents are mixed, the alkaline first agent activates the oxidizing agent in the second agent, such as hydrogen peroxide. When this mixture is applied to hair, the alkaline agent in the first agent opens the hair cuticle, allowing both the first and second agents to penetrate into the hair. Once the agents have penetrated the hair, the activated oxidizing agent in the second agent causes oxidative polymerization of the oxidative dye contained in the first agent to form a pigment, which then develops the color of the hair. Furthermore, dye-free hair treatment agents function as bleaching agents through the mechanism described above.

[0004] Here, a first agent has been proposed to promote these reactions and improve the penetration of oxidation dyes into hair. More specifically, a hair treatment agent containing a metal catalyst selected from organic acid salts of transition metals and inorganic salts of rare earth metals has been proposed. It is described that such a composition can improve the dyeability of hair (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6935193 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the hair treatment agent containing a metal catalyst described in Patent Document 1 is a pretreatment agent that is used before treatment with a first agent containing an oxidation dye, which increases the number of steps in the hair dyeing treatment, resulting in the problem that the hair dyeing treatment takes a long time.

[0007] The present invention has been made in consideration of the above problems, and aims to provide a hair treatment agent that can shorten the hair dyeing time, suppress hair damage, and improve the strength (body, resilience, and combability) and feel (softness) of hair after dyeing. [Means for solving the problem]

[0008] In order to achieve the above object, the hair treatment agent of the present invention is characterized by containing a zinc salt as component (A) and a chelating agent as component (B), the content of component (A) being 0.001% by mass or more and 5% by mass or less, and the content of component (B) being 0.001% by mass or more and 5% by mass or less. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a hair treatment agent that can shorten the hair dyeing time, suppress hair damage, and improve the strength (body, resilience, and combability) and feel (softness) of hair after dyeing. DETAILED DESCRIPTION OF THE INVENTION

[0010] Preferred embodiments of the present invention will be described below. Note that the present invention is not limited to the following embodiments, and can be appropriately modified and applied within the scope of the present invention.

[0011] The hair treatment agent of this embodiment is a hair treatment agent for dyeing or bleaching hair. More specifically, for example, in a two-component oxidative hair dye composition composed of a first component (first hair treatment agent) containing an oxidative dye and an alkaline agent and a second component (second hair treatment agent) containing an oxidizing agent, the hair treatment agent is used as the first component containing the oxidative dye and the alkaline agent, and contains a zinc salt and a chelating agent.

[0012] <Zinc salt> The hair treatment agent of this embodiment contains a zinc salt (hereinafter, sometimes referred to as component (A)). Examples of this zinc salt include zinc chloride, zinc gluconate, zinc glycinate, zinc undecylenate, zinc carbonate, zinc stearate, zinc paraphenolsulfonate, zinc palmitate, zinc myristate, zinc laurate, zinc sulfate, and zinc pyrithione. These may be used alone or in combination of two or more.

[0013] The hair treatment agent of the present invention is characterized in that the content of component (A) relative to the total amount of the hair treatment agent is 0.001% by mass or more and 5% by mass or less, with the hair treatment agent being 100% by mass.

[0014] This configuration accelerates the oxidative polymerization reaction in the hair treatment, thereby shortening the hair dyeing time. Furthermore, the zinc salt penetrates into the hair, allowing for uniform dyeing of the hair, even in the damaged areas often found at the ends and the less damaged areas near the roots. Furthermore, the zinc salt repairs the cuticle and gives the hair a supple texture, improving the feel (softness) of the hair.

[0015] <Chelating agent> The hair treatment agent of the present embodiment also contains a chelating agent (hereinafter, sometimes referred to as component (B)).

[0016] The chelating agents include diethylenetriaminepentaacetic acid (DTPA), ethylenediaminetetraacetic acid, hydroxyethylethylenediaminetriacetic acid (HEDTA), dihydroxyethylethylenediaminediacetic acid (DHEDDA), 1,3-propanediaminetetraacetic acid (1,3PDTA), triethylenetetraminehexaacetic acid (TTHA), nitrilotriacetic acid (NTA), hydroxyethyliminodiacetic acid (HIMDA), L-aspartic acid-N,N-diacetic acid (ASDA), aminotrimethylenephosphonic acid (NTMP), 1-hydroxyethane-1,1-diphosphonic acid, ethylenediamine, ascorbic acid, tartaric acid, gluconic acid, citric acid, oxalic acid, lactic acid, glycolic acid, hydroxybutyric acid, glyceric acid, glucuronic acid, succinic acid, malic acid, phytic acid, salicylic acid, benzoic acid, acetic acid, ferulic acid, maleic acid, tripolyphosphate, derivatives thereof, and salts thereof. These may be used alone or in combination of two or more.

[0017] The hair treatment agent of the present embodiment is characterized in that the content of component (B) relative to the total weight of the hair treatment agent is 0.001% by mass or more and 5% by mass or less, with the hair treatment agent being 100% by mass.

[0018] This configuration allows dyeing to be done in a shorter time and under milder conditions than conventional methods, thereby minimizing hair damage. Furthermore, the chelating agent penetrates into the hair and forms a resilient core inside the hair, improving hair strength (body, strength, and combability) after hair treatments such as dyeing.

[0019] Furthermore, the hair treatment agent of this embodiment contains 0.001% by mass or more and 5% by mass or less of component (A) (particularly zinc gluconate) and 0.001% by mass or more and 5% by mass or less of component (B). This allows the storage stability of the hair treatment agent to be maintained due to the zinc salt, which is less susceptible to air oxidation than other metals. Furthermore, because the zinc salt is stable in the presence of oxygen, the hair treatment agent can be easily manufactured.

[0020] <Alkaline agent> The alkaline agent may be an inorganic alkaline agent or an organic alkaline agent. Examples of inorganic alkaline agents include ammonia; carbonates such as sodium carbonate, potassium carbonate, and ammonium carbonate; guanidium salts such as guanidine carbonate; bicarbonates such as sodium bicarbonate and potassium bicarbonate; phosphates such as trisodium phosphate and tripotassium phosphate; pyrophosphates such as sodium pyrophosphate; silicates such as sodium silicate; metasilicates such as sodium metasilicate; acetates such as sodium acetate, potassium acetate, and calcium acetate; and inorganic alkali salts such as sodium hydroxide and potassium hydroxide. Examples of organic alkaline agents include organic amines such as monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, 2-amino-2-methyl-1-propanol, 2-aminobutanol, and 2-amino-2-methyl-1,3-propanediol.

[0021] <Oxidation dyes> Examples of dye intermediates constituting oxidation dyes include toluene-2,5-diamine sulfate, p-phenylenediamine, p-toluylenediamine, N-methyl-p-phenylenediamine, N,N-dimethyl-p-phenylenediamine, N,N-diethyl-2-methyl-p-phenylenediamine, N-ethyl-N-(hydroxyethyl)-p-phenylenediamine, chloro-p-phenylenediamine, 2-(2'-hydroxyethylamino)-5-aminotoluene, N,N-bis-(2-hydroxyethyl)-p-phenylenediamine, methoxy-p-phenylenediamine, 2,6-dichloro-p-phenylenediamine, 2-chloro-6-bromo-p-phenylenediamine, 2-chloro-6-methyl-p-phenylenediamine, 6-methoxy-3-methyl-p-phenylenediamine, 2,5-diaminoanisole, N- Examples of suitable amines include p-phenylenediamines having one or more -NH2 groups, -NHR groups, and / or -NR2 groups (wherein R is an alkyl group or hydroxyalkyl group having 1 to 4 carbon atoms), such as (2-hydroxypropyl)-p-phenylenediamine and N-2-methoxyethyl-p-phenylenediamine; 2,5-diaminopyridine derivatives; p-aminophenols and o-aminophenols such as p-aminophenol, 2-methyl-4-aminophenol, 3-methyl-4-aminophenol, 2-chloro-4-aminophenol, 3-chloro-4-aminophenol, 2,6-dimethyl-4-aminophenol, 3,5-dimethyl-4-aminophenol, 2,3-dimethyl-4-aminophenol, 2,5-dimethyl-4-aminophenol, and 2,4-diaminophenol; and o-phenylenediamines.

[0022] In addition, examples of the coupler constituting the oxidation dye include α-naphthol, o-cresol, m-cresol, 2,6-dimethylphenol, 2,5-dimethylphenol, 3,4-dimethylphenol, 3,5-dimethylphenol, benzocatechin, pyrogallol, 1,5-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, 5-amino-2-methylphenol, 5-(2'-hydroxyethylamino)-4-methoxy-2-methylphenol, hydroquinone, 2,4-diaminoanisole, m-toluylenediamine, 4-aminophenol, resorcinol, resorcinol monomethyl ether, m-phenylenediamine, 1-phenyl-3-methyl-5-pyrazolone, 1-phenyl-3-amino-5-pyrazolone, 1-phenyl-3,5-diketopyrazolidine, 1-methyl-7-dimethylamino-4-hydroxy-2-quinolone, m-aminophenol, 4-chlororesorcinol, 2-methylresorcinol, 2,4-diaminophenoxyethanol, 2,6-diaminopyridine, 3,5-diaminotrifluoromethylbenzene, 2,4-diaminofluorobenzene, 3,5-diaminofluorobenzene, 2,4-diamino-6-hydroxypyrimidine, 2,4,6-triaminopyrimidine, 2-amino-4,6-dihydroxypyrimidine, 4-amino-2,6-dihydroxypyrimidine, 4,6-diamino-2-hydroxypyrimidine.

[0023] <Solvent> In addition, the solvent (dispersion medium) used in the hair treatment agent of this embodiment is not particularly limited. For example, water (such as purified water) is used, but if necessary, an organic solvent such as ethanol or isopropanol may be contained in water at a concentration harmless even when it comes into contact with the human body.

[0024] Note that the form of the hair treatment agent of this embodiment is not limited to a solution, and components added as necessary may be suspended or emulsified.

[0025] <pH adjuster> The hair treatment agent of the present embodiment may also contain a pH adjuster. There are no particular limitations on the pH adjuster, and any pH adjuster typically used in hair cosmetics may be used. Examples include sodium pyrophosphate, phosphoric acid, guanidine carbonate, sodium dihydrogen phosphate, trisodium phosphate, sesquicarbonate, arginine, ammonium bicarbonate, sodium bicarbonate, sodium carbonate, monoethanolamine, ammonia, 2-amino-2-methyl-1-propanol, sodium hydroxide, tripotassium citrate, trisodium citrate, and diammonium hydrogen phosphate. The pH of the hair treatment agent of the present embodiment can be adjusted to 7 to 12 by using these pH adjusters.

[0026] (Other ingredients) The hair treatment agent of the present embodiment may contain other ingredients as long as the effects of the present invention are not impaired. For example, oily ingredients (e.g., sphingolipids, ceramides, cholesterol derivatives, phytosterol derivatives, phospholipids, perfluoropolyethers, etc.), vegetable oils (e.g., olive oil, shea butter, macadamia nut oil, etc.), waxes (e.g., jojoba seed oil, carnauba wax, candelilla wax, beeswax, etc.), hydrocarbons (e.g., petrolatum, isododecane, isohexadecane, paraffin wax, liquid paraffin, etc.), higher fatty acids (e.g., myristic acid, oleic acid, stearic acid, isostearic acid, branched fatty acids ( C (carbon number) 14-28), hydroxystearic acid, etc.), alcohols (e.g., cetostearyl alcohol, cetanol, isostearyl alcohol, oleyl alcohol, hydrogenated rapeseed oil alcohol, cholesterol, sitosterol, 1,3-butylene glycol, propylene glycol, dipropylene glycol, glycerin, diglycerin, 1,2-hexanediol, etc.), sugars and their derivatives (e.g., glucose, sucrose, D-sorbitol, maltose, trehalose, polyoxypropylene methylglucose, etc.), side, glyceryl glucoside, etc.), amino acids and their derivatives (e.g., glutamic acid, glycine, serine, methionine, trimethylglycine, sodium dilauroyl glutamate lysine, N-lauroyl-L-lysine, etc.), PPT and proteins (e.g., hydrolyzed silk, hydrolyzed wheat, hydrolyzed soybean, hydrolyzed collagen, hydrolyzed keratin, silylated hydrolyzed silk, silylated hydrolyzed wheat, cationized hydrolyzed silk, cationized hydrolyzed collagen, keratin, etc.), natural polymers (e.g., algin, salts, mannan, gum arabic, tamarind gum, chitosan, carrageenan, mucin, shellac, hyaluronate, cationized hyaluronic acid, xanthan gum, dextrin, hydroxyethyl cellulose, cationized cellulose, guar gum, cationized guar gum, honey, etc.), synthetic polymers (e.g., anionic polymers, cationic polymers, nonionic polymers, amphoteric polymers, polyethylene glycol, polypropylene glycol, polyoxypropylene diglyceryl ether, etc.), anionic surfactants (e.g.,Polyoxyethylene cetyl ether phosphate (10 E.O.), polyoxyethylene lauryl ether sodium sulfate, etc.), cationic surfactants (e.g., alkylamine salts, fatty acid amidoamine salts, etc.), amphoteric surfactants (e.g., glycine-type amphoteric surfactants, aminopropionic acid-type amphoteric surfactants, sulfobetaine-type amphoteric surfactants, etc.), nonionic surfactants (e.g., polyoxyethylene behenyl ether (5 E.O.), polyoxyethylene behenyl ether (10 E.O.), polyoxyethylene behenyl ether (30 E.O.)), dyes (e.g., tar dyes, natural dyes, etc.), plant extracts (e.g., chamomile extract, comfrey extract, sage extract, rosemary extract, persimmon tannin, tea dry distillate, copper chlorophyllin sodium, etc.), bicarbonate It is possible to blend various known cosmetic ingredients such as amines (e.g., DL-α-tocopherol, D-panthenol, natural vitamin E, etc.), ultraviolet absorbers (e.g., 2-ethylhexyl paramethoxycinnamate, etc.), preservatives (e.g., parabens, phenoxyethanol, etc.), antioxidants (e.g., sodium sulfite, sodium bisulfite, dibutylhydroxytoluene, etc.), other inorganic compounds (e.g., titanium oxide, silver, platinum, iron chloride, iron oxide, sodium bromate, hydrogen peroxide, etc.), other organic compounds (e.g., urea, hydroxyethyl urea, sodium dl-pyrrolidonecarboxylate, copper gluconate, etc.), solvents (e.g., benzyl alcohol, etc.), propellants (e.g., LPG (liquefied petroleum gas), DME (dimethyl ether), nitrogen gas, carbon dioxide gas, etc.), and fragrances.

[0027] The hair treatment agent of the present embodiment may be in the form of a cream, for example. It is preferable that the hair treatment agent of the present embodiment, which is the first agent, is in the form of a cream, since this facilitates mixing with the second agent containing an oxidizing agent. Furthermore, good storage stability can be achieved over a long period of time. Furthermore, the agent is less likely to drip upon application, has excellent adhesion and compatibility with hair, provides excellent hair conditioning effects, and allows for good dyeability or bleachability.

[0028] The term "creamy" as used herein refers to a state in which the hair treatment agent of the present invention is filled into a tubular container with a discharge opening of 5 to 7 mm in diameter, and when discharged at 25°C, the discharged state is maintained for one hour or more.

[0029] (Second agent) The second agent to be mixed with the hair treatment agent (first agent) of the present embodiment is not particularly limited, and may be any agent that contains an oxidizing agent as a main agent.

[0030] Examples of the oxidizing agent include hydrogen peroxide, urea peroxide, melamine peroxide, sodium percarbonate, potassium percarbonate, alkali metal bromates, alkali metal persalts (e.g., perbromates, persulfates, perborates), etc. The content of the oxidizing agent is not particularly limited, and may be, for example, 0.5 to 12.0 mass % or 1.0 to 6.0 mass % relative to the total mass of the second agent.

[0031] Furthermore, when the hair treatment agent of this embodiment (a first agent containing an alkaline agent) and a second agent containing an oxidizing agent are mixed and used, the mass ratio of the first agent to the second agent can be, for example, in the range of first agent:second agent = 1:1 to 1:3.

[0032] [Other forms] In the above-described embodiment, the first agent contains component (A) and component (B), but the first agent may contain component (A) and the second agent may contain component (B). Even in such a hair treatment agent comprising a first agent containing component (A) and a second agent containing component (B), the same effects as in the above-described embodiment can be obtained, as shown in Examples 71 to 110 described below. [Example]

[0033] The present invention will be described below based on examples. However, the present invention is not limited to these examples, and these examples can be modified or changed based on the spirit of the present invention, and such modifications are not excluded from the scope of the invention.

[0034] (Examples 1 to 70 and Comparative Examples 1 to 5) <Production of hair treatment agent (first agent)> Water (purified water) and the respective raw materials were blended to produce hair treatment agents (first agents) of Examples 1 to 70 and Comparative Examples 1 to 5, each having the composition (% by mass) shown in Tables 1 to 8. Each hair treatment agent (first agent) was in cream form.

[0035] [Table 1]

[0036] [Table 2]

[0037] [Table 3]

[0038] [Table 4]

[0039] [Table 5]

[0040] [Table 6]

[0041] [Table 7]

[0042] [Table 8]

[0043] <Production of the second agent containing an oxidizing agent> Water (purified water) and each raw material were blended to produce a second agent having the composition (mass %) shown in Table 9. The second agent was in cream form.

[0044] [Table 9]

[0045] <Preparing hair samples> A 30 cm long straight hair bundle (5 g) was bleached twice using a commercially available bleaching agent as a chemical treatment, and then permanently waving the hair from the middle to the ends using a commercially available perm solution. The treated hair was then immersed overnight in an aqueous solution of sodium polyoxyethylene lauryl sulfate (5% by mass) kept at 50°C, and thoroughly washed with water to obtain a hair sample.

[0046] <Hair dye treatment> Next, the prepared hair was subjected to the following dyeing treatments (A) to (C).

[0047] (A) First, for 5 g of sample hair, each hair treatment agent (first agent) of the Examples and Comparative Examples and the above-mentioned second agent were prepared, and the first agent and second agent were mixed in a mass ratio of first agent:second agent = 1:1 (10 g of each was used) to prepare a hair dye.

[0048] (B) Next, the prepared hair dye was applied evenly to the entire hair (from the roots to the ends) and left for a short time (10 minutes).

[0049] (C) After 10 minutes of dyeing, the hair was rinsed, shampooed and treated, and then dried using a hair dryer.

[0050] <Fade treatment> Next, the dyed hair was subjected to the following fading treatments (D) to (F).

[0051] (D) First, a sufficient amount of polyoxyethylene sodium lauryl sulfate aqueous solution (5% by mass) was prepared as a fading solution (250 ml for 5 g of sample hair) and stored in a thermostatic bath at 40°C.

[0052] (E) Next, the dyed hair was immersed in the fading solution (40°C) prepared in (D) above for 60 minutes to carry out a fading treatment.

[0053] (F) After the fading treatment in (E) above, the hair was rinsed with water and then dried using a hair dryer.

[0054] <Stainability> The above-mentioned hair dyes containing each of the hair treatment agents (first agent) of the Examples and Comparative Examples were subjected to a sensory evaluation to determine the effect on the dyeability of hair that had been dyed for the above-mentioned short period (10 minutes). Specifically, the evaluation was conducted by 10 expert panelists based on the following evaluation criteria.

[0055] Deeply colors the entire hair and has excellent dyeing power:◎ The entire hair is slightly deeply colored and has dyeing power: 〇 The hair is slightly lightly colored overall, and the dyeing power is somewhat weak: △ The entire hair is lightly colored and has no dyeing power: ×

[0056] <Damage to hair> The texture (stiffness) of the hair treated with (F) above was compared with that of untreated hair that had not been subjected to the above-mentioned hair dyeing and fading treatments, and a sensory evaluation was conducted to determine the damage to the hair caused by the above-mentioned hair dyeing and fading treatments. Specifically, the evaluation was conducted by 10 expert panelists based on the following evaluation criteria.

[0057] Compared to untreated hair, it is not stiff and has not progressed to damage:◎ Compared to untreated hair, it is less stiff and the damage is almost non-progressive: 〇 Compared to untreated hair, it is slightly stiff and slightly damaged: △ Compared to untreated hair, it is stiff and damaged: ×

[0058] <Firmness and elasticity> The hair dyes containing the hair treatment agents (first agent) of the Examples and Comparative Examples were subjected to a sensory evaluation to determine their effect on the bounce and strength of dyed hair. Specifically, the evaluation was conducted by 10 expert panelists based on the following evaluation criteria.

[0059] Very firm and resilient:◎ Firm and resilient:○ Slightly lacking firmness and elasticity: △ No firmness or elasticity: ×

[0060] <Kushi-dori Street> The above-mentioned hair dyes containing each of the hair treatment agents (first agent) of the Examples and Comparative Examples were subjected to a sensory evaluation to determine their effect on the combing (smoothness) of hair strands after the above-mentioned hair dyeing treatment. Specifically, the evaluation was conducted by 10 expert panelists based on the following evaluation criteria.

[0061] Very easy to comb:◎ Easy to comb: ○ Slightly difficult to comb: △ Difficult to comb: ×

[0062] <Softness> The hair dyes containing the hair treatment agents (first agents) of the Examples and Comparative Examples were subjected to a sensory evaluation to determine the effect on the feel (softness) of hair strands after the dyeing treatment. Specifically, the evaluation was conducted by 10 expert panelists based on the following evaluation criteria.

[0063] Very soft:◎ Soft:○ Slightly hard: △ Hardness: ×

[0064] <Uniform stainability> The above-mentioned hair dyes containing each of the hair treatment agents (first agent) of the Examples and Comparative Examples were subjected to a sensory evaluation to determine their effect on the uniform dyeing of hair that had been dyed as described above. Specifically, the evaluation was conducted by 10 expert panelists based on the following evaluation criteria.

[0065] The entire hair is colored evenly, with excellent even dyeing properties. The entire hair appears to be colored equally, providing excellent uniform dyeing: 〇 There are some uneven dyeing areas in the hair, and the dyeing is not uniform: △ The dye is uneven across the entire hair, and the dyeing is very poor: ×

[0066] <Storage stability> Each hair treatment agent (first agent) of the Examples and Comparative Examples was filled into an aluminum tube (a tubular container with a discharge port of 5 to 7 mmφ) and stored at 40°C for 6 months. The storage stability was then evaluated based on the change in agent color after 6 months of storage. Specifically, evaluation was carried out by 10 expert panelists based on the following evaluation criteria.

[0067] No change in color of the agent: ◎ Small change in agent color: 〇 Large change in agent color: △ The color change is very large: ×

[0068] <Fading resistance> The hair that had been subjected to the above-mentioned hair dyeing treatment and fading treatment was subjected to a sensory evaluation of the effect of the above-mentioned hair dyes containing each hair treatment agent (first agent) of the Examples and Comparative Examples on fading after the fading treatment. Specifically, the evaluation was conducted by 10 expert panelists based on the following evaluation criteria.

[0069] There is very little fading throughout the hair, and the color is very vivid. There is little fading throughout the hair, and the color is sufficiently vivid: 〇 The hair is faded and the color is insufficient: △ The hair as a whole is faded and the color is not vibrant: ×

[0070] The term "vivid color" used herein refers to a state in which the color of the hair can be recognized as vivid by visual inspection.

[0071] In addition, in each of the above evaluations, the final evaluation was determined based on the evaluation criterion selected most frequently by the 10 expert panelists from among "◎", "〇", "△", and "×". "◎" was evaluated as being particularly excellent, and "○" was evaluated as being excellent. "△" and "×" were evaluated as being insufficient. The results are shown in Tables 1 to 8.

[0072] As shown in Tables 1 to 7, the hair treatments of Examples 1 to 70, which contain a zinc salt as component (A) and a chelating agent as component (B), with component (A) content of 0.001% by mass to 5% by mass and component (B) content of 0.001% by mass to 5% by mass, shorten the hair dyeing time and enable uniform dyeing of hair, even in damaged areas often found at the ends and less damaged areas near the roots. Furthermore, it is clear that hair damage can be suppressed and hair feel (softness) can be improved. It is also clear that hair strength (body, resilience, combability) after dyeing can be improved and the storage stability of the hair treatment can be maintained.

[0073] (Examples 71 to 110) <Production of hair treatment agent (first agent)> Water (purified water) and the respective raw materials were blended to produce first agents (first hair treatment agents containing component (A)) of Examples 71 to 110 having the compositions (% by mass) shown in Tables 10 to 13. Each of the first agents was in cream form.

[0074] [Table 10]

[0075] [Table 11]

[0076] [Table 12]

[0077] [Table 13]

[0078] <Production of the second agent containing an oxidizing agent> Water (purified water) and the respective raw materials were blended to produce second agents (second hair treatment agents containing component (B)) having the compositions (% by mass) shown in Tables 14 to 17. The second agents were in cream form.

[0079] [Table 14]

[0080] [Table 15]

[0081] [Table 16]

[0082] [Table 17]

[0083] <Hair dye treatment> Next, the above-mentioned sample hair was prepared, and the prepared hair was subjected to the following dyeing treatments (a) to (c).

[0084] (a) First, for 5 g of sample hair, the first and second agents of each Example (for example, in Example 71, the first agent shown in Table 10 and the second agent shown in Table 14) were prepared, and the first and second agents were mixed in a mass ratio of first agent:second agent = 1:1 (10 g of each was used) to prepare the hair dye.

[0085] (b) Next, the prepared hair dye was applied evenly to the entire hair (from the roots to the ends) and left for a short period of time (10 minutes).

[0086] (c) After 10 minutes of dyeing, the hair was rinsed, shampooed and treated, and then dried using a hair dryer.

[0087] <Fade treatment> Next, the dyed hair was subjected to the following fading treatments (d) to (e).

[0088] (d) First, a sufficient amount of polyoxyethylene sodium lauryl sulfate aqueous solution (5% by mass) was prepared as a discoloration solution (250 ml for 5 g of sample hair) and stored in a thermostatic bath at 40°C.

[0089] (e) Next, the dyed hair was immersed in the fading solution (40°C) prepared in (d) above for 60 minutes to carry out a fading treatment.

[0090] (f) After the fading treatment in (e) above, the hair was rinsed with water and then dried using a hair dryer.

[0091] <Stainability> The effects of the above-mentioned hair dyes containing each of the hair treatment agents (first and second agents) of the Examples on the dyeability of hair that had been dyed for the short period of time (10 minutes) described above were evaluated by a sensory panel of 10 experts based on the following evaluation criteria.

[0092] Deeply colors the entire hair and has excellent dyeing power:◎ The entire hair is slightly deeply colored and has dyeing power: 〇 The hair is slightly lightly colored overall, and the dyeing power is somewhat weak: △ The entire hair is lightly colored and has no dyeing power: ×

[0093] <Damage to hair> The texture (stiffness) of the hair treated with (f) above was compared with that of untreated hair that had not been subjected to the above-mentioned hair dyeing and fading treatments, and a sensory evaluation was conducted to determine the damage to the hair caused by the above-mentioned hair dyeing and fading treatments. Specifically, the evaluation was conducted by 10 expert panelists based on the following evaluation criteria.

[0094] Compared to untreated hair, it is not stiff and has not progressed to damage:◎ Compared to untreated hair, it is less stiff and the damage is almost non-progressive: 〇 Compared to untreated hair, it is slightly stiff and slightly damaged: △ Compared to untreated hair, it is stiff and damaged: ×

[0095] <Firmness and elasticity> The hair dyes containing each of the hair treatment agents (first and second agents) of the Examples were subjected to a sensory evaluation to determine their effect on the bounce and strength of hair that had been dyed as described above. Specifically, the evaluation was conducted by 10 expert panelists based on the following evaluation criteria.

[0096] Very firm and resilient:◎ Firm and resilient:○ Slightly lacking firmness and elasticity: △ No firmness or elasticity: ×

[0097] <Kushi-dori Street> The above-mentioned hair dyes containing each of the hair treatment agents (first and second agents) of the Examples were subjected to a sensory evaluation to determine their effect on the combing (smoothness) of hair strands when detangled after the above-mentioned hair dyeing treatment. Specifically, the evaluation was conducted by 10 expert panelists based on the following evaluation criteria.

[0098] Very easy to comb:◎ Easy to comb: ○ Slightly difficult to comb: △ Difficult to comb: ×

[0099] <Softness> A sensory evaluation was conducted on the effect of the above-mentioned hair dyes containing each of the hair treatment agents (first and second agents) of the Examples on the feel (softness) of hair strands when detangled after the above-mentioned hair dyeing treatment. Specifically, the evaluation was conducted by 10 expert panelists based on the following evaluation criteria.

[0100] Very soft:◎ Soft:○ Slightly hard: △ Hardness: ×

[0101] <Uniform stainability> The effects of the above-mentioned hair dyes containing each of the hair treatment agents (first and second agents) of the Examples on the uniform dyeing of hair that had been dyed as described above were evaluated by a sensory panel of 10 experts based on the following evaluation criteria.

[0102] The entire hair is colored evenly, with excellent even dyeing properties. The entire hair appears to be colored equally, providing excellent uniform dyeing: 〇 There are some uneven dyeing areas in the hair, and the dyeing is not uniform: △ The dye is uneven across the entire hair, and the dyeing is very poor: ×

[0103] <Storage stability> Each hair treatment agent (first agent and second agent) of the Examples was filled into an aluminum tube (a tubular container with a discharge port of 5 to 7 mmφ) and stored at 40°C for 6 months. The storage stability was evaluated based on the change in agent color after 6 months of storage. Specifically, evaluation was carried out by 10 expert panelists based on the following evaluation criteria.

[0104] No change in color of the agent: ◎ Small change in agent color: 〇 Large change in agent color: △ The color change is very large: ×

[0105] <Fading resistance> The hair that had been subjected to the above-mentioned hair dyeing and fading treatments was subjected to a sensory evaluation of the effect of the above-mentioned hair dye containing each hair treatment agent (first agent and second agent) of the Examples on fading after the fading treatment. Specifically, the evaluation was conducted by 10 expert panelists based on the following evaluation criteria.

[0106] There is very little fading throughout the hair, and the color is very vivid. There is little fading throughout the hair, and the color is sufficiently vivid: 〇 The hair is faded and the color is insufficient: △ The hair as a whole is faded and the color is not vibrant: ×

[0107] The term "vivid color" used herein refers to a state in which the color of the hair can be recognized as vivid by visual inspection.

[0108] In addition, in each of the above evaluations, the final evaluation was determined based on the evaluation criterion selected most frequently by the 10 expert panelists from among "◎", "〇", "△", and "×". "◎" was evaluated as being particularly excellent, and "○" was evaluated as being excellent. "△" and "×" were evaluated as being insufficient. The results are shown in Tables 10 to 13.

[0109] As shown in Tables 10 to 13, the hair treatments of Examples 71 to 110, which comprise a first agent (first hair treatment agent) containing a zinc salt as component (A) and a component (A) content of 0.001% by mass to 5% by mass, and a second agent (second hair treatment agent) containing a chelating agent as component (B) and a component (B) content of 0.001% by mass to 5% by mass, shortened the hair dyeing time and enabled uniform dyeing of hair, even in damaged areas often found at the ends and less damaged areas near the roots. Furthermore, it was found that hair damage was suppressed and hair texture (softness) was improved. It was also found that hair strength (body, resilience, combability) after dyeing was improved and the storage stability of the hair treatment was maintained. [Industrial Applicability]

[0110] As described above, the present invention is particularly useful as a hair treatment agent used in hair treatments such as dyeing and bleaching.

Claims

1. Contains a zinc salt as component (A), The component (B) contains a chelating agent, A hair treatment agent characterized in that the content of component (A) is 0.001% by mass or more and 5% by mass or less, and the content of component (B) is 0.001% by mass or more and 5% by mass or less.

2. 2. The hair treatment agent according to claim 1, wherein the component (A) is at least one selected from the group consisting of zinc chloride, zinc gluconate, zinc glycinate, zinc undecylenate, zinc carbonate, zinc stearate, zinc p-phenolsulfonate, zinc palmitate, zinc myristate, zinc laurate, zinc sulfate, and zinc pyrithione.

3. 3. The hair treatment agent according to claim 1, wherein the component (B) is at least one selected from the group consisting of diethylenetriaminepentaacetic acid, ethylenediaminetetraacetic acid, hydroxyethylethylenediaminetriacetic acid, dihydroxyethylethylenediaminediacetic acid, 1,3-propanediaminetetraacetic acid, triethylenetetraminehexaacetic acid, nitrilotriacetic acid, hydroxyethyliminodiacetic acid, L-aspartic acid-N,N-diacetic acid, aminotrimethylenephosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid, ethylenediamine, ascorbic acid, tartaric acid, gluconic acid, citric acid, oxalic acid, lactic acid, glycolic acid, hydroxybutyric acid, glyceric acid, glucuronic acid, succinic acid, malic acid, phytic acid, salicylic acid, benzoic acid, acetic acid, ferulic acid, maleic acid, tripolyphosphoric acid, derivatives thereof, and salts thereof.

4. a first hair treatment agent containing a zinc salt as component (A); a second hair treatment agent containing a chelating agent as component (B); A hair treatment agent comprising: the content of the component (A) in the first hair treatment agent is 0.001% by mass or more and 5% by mass or less, The content of the component (B) in the second hair treatment agent is 0.001% by mass or more and 5% by mass or less. A hair treatment agent characterized by:

5. 5. The hair treatment agent according to claim 4, wherein the component (A) is at least one selected from the group consisting of zinc chloride, zinc gluconate, zinc glycinate, zinc undecylenate, zinc carbonate, zinc stearate, zinc p-phenolsulfonate, zinc palmitate, zinc myristate, zinc laurate, zinc sulfate, and zinc pyrithione.

6. 6. The hair treatment agent according to claim 4, wherein the component (B) is at least one selected from the group consisting of diethylenetriaminepentaacetic acid, ethylenediaminetetraacetic acid, hydroxyethylethylenediaminetriacetic acid, dihydroxyethylethylenediaminediacetic acid, 1,3-propanediaminetetraacetic acid, triethylenetetraminehexaacetic acid, nitrilotriacetic acid, hydroxyethyliminodiacetic acid, L-aspartic acid-N,N-diacetic acid, aminotrimethylenephosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid, ethylenediamine, ascorbic acid, tartaric acid, gluconic acid, citric acid, oxalic acid, lactic acid, glycolic acid, hydroxybutyric acid, glyceric acid, glucuronic acid, succinic acid, malic acid, phytic acid, salicylic acid, benzoic acid, acetic acid, ferulic acid, maleic acid, tripolyphosphoric acid, derivatives thereof, and salts thereof.

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