Hair composition and hair treatment method

Abstract

To obtain a composition for hair capable of providing improving effects on hair characteristics (improvement in hair strength or suppression of reduction in hair strength) even in an alkaline region.SOLUTION: This composition for the hair is obtained by formulating (A) one or more kinds selected from the group consisting of catechol, hydroquinone, ferulic acid, resveratrol, a polyphenol having ≥ 2 4-hydroxyphenyl groups, a polyphenol having ≥ 1 or ≥ 2 3, 4-dihydroxyphenyl groups and a polyphenol having ≥ 1 or ≥ 2 3,4,5 - trihydroxyphenyl groups with (B) a chelating agent.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a hair composition and a hair treatment method. [Background technology]

[0002] Physical treatments such as brushing, hand dryers, and hot irons can cause hair to lose its texture and luster. Chemical treatments such as hair coloring and permanent waves can also cause the keratin protein inside the hair to leak out, resulting in a loss of elasticity and strength. Various protective and repair agents have been proposed for hair damaged by physical or chemical treatments.

[0003] For example, Patent Document 1 discloses blending naturally-derived peptides into hair compositions such as treatments. It is also known to blend modified peptides into hair compositions, in which specific modifying groups have been introduced. Patent Document 2 discloses hair compositions blended with specific hydroxyl-containing compounds, including catechol and hydroquinone. The examples in Patent Document 2 show that applying a composition blended with ingredients such as catechol, hydroquinone, and chicoric acid to hair improved the breaking strength of the hair. Hair breaking strength indicates how resistant the hair is to breakage and serves as an index of hair properties. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-241833 [Patent Document 2] WO2022 / 054484 publication Summary of the Invention [Problem to be solved by the invention]

[0005] On the other hand, Patent Document 2 discloses that even compositions containing the above ingredients are ineffective in the alkaline range where the pH exceeds 9. However, many treatments used in hair treatments are alkaline, such as hair bleaches, and there is a continuing need for improved hair properties. In view of this situation, one object of the present invention is to provide a hair composition that can improve hair properties (improve hair strength or inhibit hair strength loss) even in the alkaline range. Another object of the present invention is to provide a method for treating hair using a hair composition that can improve hair properties even in the alkaline range. [Means for solving the problem]

[0006] The present disclosure includes the following inventions [1] to [7]. [1] A hair composition containing (A) one or more polyphenols selected from the group consisting of catechol, hydroquinone, ferulic acid, resveratrol, polyphenols having two or more 4-hydroxyphenyl groups, polyphenols having one or more 3,4-dihydroxyphenyl groups, and polyphenols having one or more 3,4,5-trihydroxyphenyl groups, and (B) a chelating agent.

[0007] [2] The hair composition according to [1], further comprising (C) an alkaline agent. [3] The hair composition according to [1] or [2], which has a pH of 8 to 12. [4] The hair composition according to any one of [1] to [3], further comprising (D) an oxidizing agent.

[0008] [5] The hair composition according to any one of [1] to [4], which is used as an oxidative hair dye or hair bleach. [6] The hair composition according to any one of [1] to [4], which is used as the first or second agent of an oxidative hair dye or hair bleach.

[0009] [7] A hair treatment method using the hair composition according to any one of [1] to [6]. [Effects of the Invention]

[0010] The hair composition according to the present disclosure provides a hair composition and a hair treatment method that can improve hair properties (improve hair strength or prevent a decrease in hair strength) even in the alkaline range. DETAILED DESCRIPTION OF THE INVENTION

[0011] The hair composition according to the present disclosure contains (A) one or more polyphenols selected from the group consisting of catechol, hydroquinone, ferulic acid, resveratrol, polyphenols having two or more 4-hydroxyphenyl groups, polyphenols having one or more 3,4-dihydroxyphenyl groups, and polyphenols having one or more 3,4,5-trihydroxyphenyl groups, and (B) a chelating agent.

[0012] Conventionally, the components listed in the above group (A) have been known as compounds that contribute to improving hair properties (hereinafter, components included in group (A) may be referred to as "component (A)"). However, it was thought that even compositions containing component (A) would not provide a hair-improving effect in the alkaline range. In contrast, the composition according to the present disclosure is characterized by the incorporation of a chelating agent in addition to component (A), and provides a hair-improving effect even in the alkaline range. The prior art (Patent Document 2) does not disclose any composition containing a chelating agent in addition to component (A), and it was not predicted that the combination of component (A) and a chelating agent would provide a hair-improving effect regardless of the pH range.

[0013] [Specific example of embodiment] The hair composition according to the present disclosure will be described in more detail below. In this specification, unless otherwise specified, the numerical range "A to B" means "A or more and B or less."

[0014] <Hair composition> The hair composition according to the present disclosure contains a specific component (component (A), described in detail below) that improves hair properties, such as catechol, and a chelating agent (component (B)). The hair composition according to the present disclosure is typically blended with water, and the amount of water in the hair composition is, for example, 60% by mass or more.

[0015] The pH of the hair composition according to the present disclosure is not particularly limited and may be either alkaline (pH 8 to 12) or outside the alkaline range (e.g., pH 6 to 8). A pH of 8 to 12 is preferred, and within this pH range, the composition may be set to, for example, pH 9.0 to 11.0 or pH 9.5 to 10.5. The hair treatment agent according to the present disclosure is believed to exhibit an effect of improving hair properties through the combination of component (A) and component (B), and this effect is believed to be obtained regardless of the pH range.

[0016] <Component (A)> The hair composition according to the present disclosure contains one or more selected from the group consisting of catechol, hydroquinone, ferulic acid, resveratrol, polyphenols having two or more 4-hydroxyphenyl groups, polyphenols having one or more 3,4-dihydroxyphenyl groups, and polyphenols having one or more 3,4,5-trihydroxyphenyl groups. Without being bound by theory, it is believed that component (A) is involved in the cross-linking structure between lysozymes in the hair, thereby affecting the improvement of hair properties.

[0017] Specific examples of polyphenols having two or more 4-hydroxyphenyl groups, polyphenols having one or more 3,4-dihydroxyphenyl groups, and polyphenols having one or more 3,4,5-trihydroxyphenyl groups include those having only a 4-hydroxyphenyl group, those having only a 3,4-dihydroxyphenyl group, those having only a 3,4,5-trihydroxyphenyl group, those having a 4-hydroxyphenyl group and a 3,4-dihydroxyphenyl group, those having a 4-hydroxyphenyl group and a 3,4,5-trihydroxyphenyl group, those having a 3,4-dihydroxyphenyl group and a 3,4,5-trihydroxyphenyl group, and those having a 4-hydroxyphenyl group, a 3,4-dihydroxyphenyl group and a 3,4,5-trihydroxyphenyl group.

[0018] Polyphenols having a 4-hydroxyphenyl group, a 3,4-dihydroxyphenyl group, or a 3,4,5-trihydroxyphenyl group are known as well-known polyphenols belonging to flavonoids (e.g., flavones, flavanals, flavonols), chlorogenic acids, etc., and are contained in plant extracts. Examples of polyphenols having two or more 4-hydroxyphenyl groups include tiliroside. Examples of extracts containing tiliroside include strawberry seed extract. Examples of polyphenols having one 3,4-dihydroxyphenyl group include luteolin, catechin, quercetin, chlorogenic acid, caffeoyl glucose, quercitrin, and rutin. Examples of extracts containing luteolin include perilla seed extract and chrysanthemum flower extract. Examples of extracts containing catechin include tea leaf extract. Examples of extracts containing quercetin include onion root extract. Examples of extracts containing chlorogenic acid include lobster coffee tree seed extract. Examples of extracts containing caffeoyl glucose include cherry blossom flower extract. Examples of extracts containing quercitrin include kiwi seed extract. Examples of extracts containing rutin include buckwheat leaf extract. Examples of polyphenols having two or more 3,4-dihydroxyphenyl groups include butterbur acid, chicoric acid, and echinacoside. Examples of extracts containing butterbur acid include butterbur leaf / stem extract. Examples of extracts containing chicoric acid include Echinacea purpurea extract. Examples of extracts containing echinacoside include Cistanche tuberosa root extract. Examples of polyphenols having one 3,4,5-trihydroxyphenyl group include gallic acid, propyl gallate, and delphinidin-3,5-glucoside. Examples of extracts containing gallic acid include evening primrose seed extract. Examples of extracts containing delphinidin-3,5-glucoside include Aristotelia chilensis fruit extract.Examples of polyphenols having two or more 3,4,5-trihydroxyphenyl groups include tannic acid and GHG (1,2-di-galloyl-4,6-hexahydroxydiphenoyl-β-D-glucose). Examples of extracts containing GHG include tea leaf extract.

[0019] The amount of component (A) in the hair composition is not particularly limited, but is preferably 0.001% by mass or more but less than 1.0% by mass, more preferably 0.003% by mass or more but less than 0.5% by mass, more preferably 0.005% by mass or more but less than 0.3% by mass, and even more preferably 0.01% by mass or more but less than 0.1% by mass. A content of 0.001% by mass or more is suitable for improving hair properties, and a content less than 1.0% by mass is suitable for reducing costs.

[0020] The polyphenol of component (A) may have a molecular weight of less than 1000, preferably less than 800, and more preferably less than 600, from the viewpoint of penetrating deep into the hair to improve hair properties. The blending ratio of polyphenols with a molecular weight of less than 1000 is not particularly limited, but may be 0.001% by mass or more but less than 1.0% by mass, preferably 0.003% by mass or more but less than 0.5% by mass, more preferably 0.005% by mass or more but less than 0.3% by mass, and even more preferably 0.01% by mass or more but less than 0.1% by mass. A blending ratio of 0.001% by mass or more is favorable for improving hair properties, and a blending ratio of less than 1.0% by mass is favorable for reducing costs.

[0021] <(B) component> The hair composition according to the present disclosure contains a chelating agent. Without being bound by theory, it is believed that component (A) is involved in the cross-linking of lysozymes in hair, and that components (A) and (B) work together to improve hair properties regardless of the pH range.

[0022] Specific examples of chelating agents include edetic acid, edetate salts (disodium edetate, trisodium edetate, tetrasodium edetate, dipotassium edetate, etc.), diethylenetriaminepentaacetic acid, diethylenetriaminepentaacetic acid salts (pentasodium diethylenetriaminepentaacetic acid, etc.), ethylenediaminehydroxyethyltriacetic acid, ethylenediaminehydroxyethyltriacetate salts (trisodium ethylenediaminehydroxyethyltriacetate, etc.), hydroxyethanediphosphonic acid, hydroxyethanediphosphonic acid salts (tetrasodium hydroxyethanediphosphonate, etc.). One type of chelating agent may be used alone, or two or more types may be used in combination.

[0023] The amount of component (B) in the hair composition is not particularly limited, but is preferably 0.001% by mass or more but less than 10% by mass, more preferably 0.05% by mass or more but less than 5% by mass, more preferably 0.05% by mass or more but less than 3% by mass, and even more preferably 0.1% by mass or more but less than 2% by mass. A content of 0.05% by mass or more is suitable for improving hair properties, and a content less than 10% by mass is suitable for reducing costs.

[0024] The ratio of the amounts of component (A) and component (B) blended is not limited as long as the effects of the present disclosure are obtained, but may be, for example, component (A):component (B) 1:0.8 to 1:5, or 1:1 to 1:4. When the ratio is within this range, the effects of using component (A) and component (B) in combination can be obtained, and a composition having physical properties suitable for use as a hair composition can be formed.

[0025] <(C) component> In addition to components (A) and (B), the hair composition according to the present disclosure may contain an alkaline agent. The alkaline agent is a component typically found in the first agent of an oxidation hair dye, and any known component used as an alkaline agent in hair treatments may be used. The alkaline agent is a component capable of adjusting the pH to alkaline. Specific examples of alkaline agents include metal hydroxides such as sodium hydroxide and potassium hydroxide; metal carbonates such as sodium carbonate and potassium carbonate; metal phosphates such as sodium phosphate; aqueous ammonia; ammonium salts such as ammonium carbonate, ammonium bicarbonate, and ammonium sulfate; and alkanolamines such as monoethanolamine, triethanolamine, and isopropanolamine. A single alkaline agent may be used, or two or more may be combined. It is particularly preferred that two or more alkaline agents be used, so that the aqueous composition functions as a pH buffer.

[0026] The amount of component (C) in the hair composition is not particularly limited, but is preferably 0.001% by mass or more but less than 15% by mass, more preferably 0.1% by mass or more but less than 12% by mass, more preferably 1.0% by mass or more but less than 10% by mass, and even more preferably 2.0% by mass or more but less than 6.0% by mass. A content of 0.001% by mass or more is suitable for improving dye penetration into hair when performing an oxidation hair dyeing treatment, and a content of less than 15% by mass is suitable for reducing costs.

[0027] In the composition according to the present disclosure, component (C) is not essential, and component (C) may or may not be blended in. For example, when the composition according to the present disclosure is configured as a second agent for oxidative hair dyeing, component (C) is not blended in.

[0028] <(D) component> In addition to components (A) and (B), the hair composition according to the present disclosure may contain an oxidizing agent. It is also preferable to combine components (A), (B), and (C) and further incorporate component (D). The oxidizing agent is a component that is incorporated, for example, in the second agent in oxidation hair dyeing, and any component known as an oxidizing agent in hair treatments can be used. Specific examples of oxidizing agents include hydrogen peroxide, bromates, and perborates.

[0029] The amount of component (D) in the hair composition is not particularly limited, but is preferably 0.5% by mass or more but less than 10% by mass, more preferably 1.0% by mass or more but less than 8.0% by mass, more preferably 2.0% by mass or more but less than 6.0% by mass, and even more preferably 2.5% by mass or more but less than 5.0% by mass. A content of 0.5% by mass or more is suitable for improving the brightness of hair when performing an oxidation hair dye treatment, and a content of less than 10% by mass is suitable for reducing costs.

[0030] In the composition according to the present disclosure, component (D) is not essential, and component (D) may or may not be blended in. For example, when the composition according to the present disclosure is a composition used as a first agent for oxidative hair dyeing, component (D) is not blended in.

[0031] <Other ingredients> In addition to the components (A) to (D) described above, the composition according to the present disclosure may contain optional components known as components for hair compositions, as long as the composition has the effects according to the present disclosure. Examples of optional components include higher alcohols, cationic surfactants, anionic surfactants, nonionic surfactants, polyhydric alcohols, sugars, ester oils, fats and oils, fatty acids, hydrocarbons, waxes, silicones, polymeric compounds, amino acids, fragrances, and preservatives.

[0032] When a higher alcohol and a cationic surfactant are blended into the hair composition according to the present disclosure, the higher alcohol may have from 12 to 22 carbon atoms. Examples of higher alcohols include linear saturated alcohols such as cetyl alcohol, stearyl alcohol, and behenyl alcohol; and branched saturated alcohols such as hexyldecanol, octyldodecanol, isostearyl alcohol, and tetradecyloctadecanol. The amount of higher alcohol blended is not particularly limited, but may be, for example, from 1 to 10% by mass. Examples of the cationic surfactant include fatty acid amidoamine salts, Arcobale-type tertiary amine salts, long-chain alkyl trimethyl ammonium salts, dilong-chain alkyl dimethyl ammonium salts, and monoalkyl ether-type quaternary ammonium salts (note that the "long-chain alkyl" is preferably an alkyl group having from 12 to 22 carbon atoms). The amount of cationic surfactant blended is not particularly limited, but may be, for example, from 1 to 5% by mass.

[0033] <Products that use hair treatment agents> The hair composition according to the present disclosure is preferably used as a hair treatment agent. Specific examples of hair treatment agents include oxidative hair dyes, first agents for oxidative hair dyes, second agents for oxidative hair dyes, hair bleaches, first agents for hair bleaching, second agents for hair bleaching, first agents for hair transformation treatments, and second agents for hair transformation treatments. The hair transformation treatments described above are treatments that transform hair into a straight or wavy shape by reducing or oxidizing the hair, and include well-known hair straightening treatments and permanent wave treatments.

[0034] When the hair treatment composition according to the present disclosure is the first agent of an oxidative hair dye, it contains, in addition to components (A) and (B), an alkali agent and a dye as component (C). The first agent of an oxidative hair dye typically contains 70% by mass or more of water.

[0035] The oxidation dye to be incorporated into the first agent for oxidation hair dyeing is not particularly limited, and can be one or more selected from known dye intermediates that develop color by oxidation alone. Examples of dye intermediates include phenylenediamine derivatives such as toluene-2,5-diamine hydrochloride, toluene-2,5-diamine sulfate, nitroparaphenylenediamine hydrochloride, nitroparaphenylenediamine, and paraphenylenediamine; and phenol derivatives such as 2,4-diaminophenol hydrochloride, orthoaminophenol sulfate, orthoaminophenol, paraaminophenol sulfate, and paraaminophenol. The oxidation dye in the first agent can also be one or more selected from known couplers that develop color upon oxidation by the dye intermediate. Examples of couplers include phenylenediamine derivatives such as 2,4-diaminophenoxyethanol hydrochloride, metaphenylenediamine hydrochloride, and metaphenylenediamine; aminophenol derivatives such as 5-aminoorthocresol sulfate, 5-aminoorthocresol, and metaaminophenol; resorcinol; and α-naphthol. The amount of the oxidative dye in the first agent for oxidative hair dyeing may be, for example, 0.05% by mass or more and 10% by mass or less. Furthermore, the first agent of the oxidative hair dye may contain one or more of the above-mentioned optional ingredients.

[0036] When the hair treatment composition according to the present disclosure is a first agent for hair bleaching, it contains an alkaline agent (C) in addition to components (A) and (B). Except for the absence of a dye, it can contain the same ingredients as the first agent for oxidative hair dyeing described above.

[0037] The pH of the first agent at 25°C is, for example, 8.5 to 12.5, or 9.0 to 11.0, preferably 9.5 to 10.5. A pH of 8.5 or higher is suitable for promoting penetration of the oxidative dye into the hair, while a pH of 12.5 or lower is suitable for suppressing skin irritation. The pH of the first agent can be adjusted by adding an alkaline agent, component (C).

[0038] When the hair treatment composition according to the present disclosure is a second agent for oxidative hair dyeing, in addition to components (A) and (B), an oxidizing agent (component (D)) is blended. A typical second agent for oxidative hair dyeing contains 70% or more by mass of water. Furthermore, the second agent for oxidative hair dyeing can contain one or more of the optional components listed above.

[0039] The pH of the second agent at 25°C is, for example, 2.0 or more and 4.0 or less when hydrogen peroxide is blended as an oxidizing agent.

[0040] When the hair treatment composition according to the present disclosure is an oxidative hair dye, the oxidative hair dye may be an oil-in-water composition obtained by mixing a first agent for oxidative hair dyeing and a second agent for oxidative hair dyeing. Typical oxidative hair dyes contain 70% or more by mass of water.

[0041] The pH of the oxidative hair dye at 25°C is preferably adjusted to an alkaline level by adding an alkaline agent to the first agent or the like, and is, for example, from 8.5 to 12.0, preferably from 9.0 to 11.0, and more preferably from 9.5 to 10.5. A pH of 8.0 or higher is suitable for promoting penetration of the oxidative dye into the interior of the hair, while a pH of 12.0 or lower is suitable for preventing irritation to the skin.

[0042] The mixing ratio of the first agent and the second agent to obtain the oxidation hair dye may be, for example, a mass ratio of first agent:second agent=1:0.5 or more and 2 or less.

[0043] The formulation of the oxidation hair dye when used is not particularly limited, and examples thereof include liquid, cream, wax, gel, and foam (foam). Taking into consideration handling such as application to hair and dripping during use, the oxidation hair dye is preferably in cream form.

[0044] When the hair treatment agent according to the present disclosure is a second agent for hair bleaching, it can be configured in the same manner as the second agent for oxidative hair dyeing described above. The hair bleach may be obtained by mixing a first agent for hair bleaching and a second agent for hair bleaching.

[0045] When the hair treatment agent according to the present disclosure is a first agent for hair transformation treatment, it may have the same composition as known first agents for hair transformation treatment, except that it contains components (A) and (B). The first agent for hair transformation contains a reducing agent and typically contains an alkaline agent (C) to adjust the pH at 25°C to, for example, 8.0 or higher to 10.0 or lower.

[0046] The first hair transforming agent contains one or more reducing agents. Examples of the reducing agent include known reducing agents having a thiol group, such as thioglycolic acid, thioglycolic acid salts (sodium thioglycolate, ammonium thioglycolate, monoethanolamine thioglycolate, etc.), mercaptopropionic acid, mercaptopropionate salts, cysteine ​​(L-cysteine, DL-cysteine, etc.), cysteine ​​salts (L-cysteine ​​hydrochloride, DL-cysteine ​​hydrochloride, etc.), acetylcysteine ​​(N-acetyl-L-cysteine, etc.), cysteine ​​alkyl esters (L-cysteine ​​methyl ester, L-cysteine ​​ethyl ester, etc.), cysteamine, cysteamine salts (cysteamine hydrochloride, etc.), glyceryl thioglycolate, thioglycerin, thiolactic acid, thiolactate salts, thiomalic acid, thiomalate salts, and butyrolactone thiol.

[0047] When the hair treatment agent according to the present disclosure is a second agent for hair transformation treatment, it may have the same composition as known second agents for hair transformation treatment, except that it contains component (A), component (B), and component (D).

[0048] <Hair treatment method> The hair treatment method according to the present disclosure is a method carried out using the hair composition described above. When the hair composition is an oxidation hair dye, oxidation hair dyeing can be carried out using steps and conditions similar to known oxidation hair dyeing methods. When the hair composition is a hair bleach, hair bleaching can be carried out using steps and conditions similar to known hair bleaching methods. When the hair composition is a hair transformation treatment, hair transformation can be carried out using steps and conditions similar to known hair transformation treatment methods.

[0049] A specific treatment procedure may involve applying a hair composition according to the present disclosure to hair and rinsing with or without rinsing with water. The hair to be treated by the hair treatment method is not particularly limited. Physical treatments (e.g., brushing) and chemical treatments (e.g., oxidative hair dyeing, straightening, and permanent wave treatments) can cause hair properties to deteriorate, so such hair is preferably treated by the hair treatment method according to the present disclosure. The above-mentioned chemical treatments involve oxidation reactions with oxidizing agents such as hydrogen peroxide, which can damage hair and reduce its properties. However, the use of a hair composition according to the present disclosure can prevent deterioration of hair properties or improve hair properties.

[0050] The hair composition is preferably in a form that allows easy application and absorption to the hair, such as a liquid, emulsion, lotion, cream, foam, or mist. The viscosity of the hair composition is selected as desired depending on the intended use, but may be, for example, 80,000 mPa·s or less, and preferably 50,000 mPa·s or less, after 60 seconds as measured at 25°C using a Brookfield viscometer.

[0051] [Example] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these examples.

[0052] Hair treatment was carried out using the hair compositions of the Examples and Comparative Examples, and the work of breaking was measured as an index of the physical properties of the hair. The details are as follows.

[0053] 1. Preparation of hair composition Hair compositions were prepared so as to have the blending amounts and pH values ​​shown in Tables 1 to 6. Each composition was blended with water so that the total amount was 100% by mass. The ingredients used are as follows: [Component (A)] Gallic acid, propyl gallate, tannic acid, hydroquinone, chicoric acid-containing extract (Echinacea purpurea extract) [Component (B)] EDTA (Ethylenediaminetetraacetic acid), EDTA-2Na (Disodium edetate), HEDTA (Hydroxyethylethylenediaminetriacetic acid trisodium), DTPA5Na (Diethylenetriaminepentaacetic acid pentasodium), HEDP (Hydroxyethanediphosphonic acid) [Component (C)] pH 10 buffer solution: Add water to 0.53 g of sodium carbonate and 0.42 g of sodium bicarbonate to make 100 mL of solution, and use this to make a 0.1 M pH 10 buffer solution. Sodium carbonate and sodium bicarbonate fall under the category of component (C). [Component (D)] hydrogen peroxide [Other ingredients] pH 6 buffer solution: 1.14 g of sodium dihydrogen phosphate and 0.085 g of disodium hydrogen phosphate were mixed with water to make 100 mL, and this was used as a 0.1 M pH 6 buffer solution. Copper Chlorophyllin

[0054] 2. Hair treatment using a hair composition Hair to be treated The hair to be treated was a 0.5 g bundle of hair from a Japanese woman obtained from a beauty salon. In the same table below, the hair of the same Japanese woman was used as the hair to be treated. Hair treatment methods A hair composition was applied to the hair bundle in an amount four times the weight of the hair bundle, left to stand at room temperature for 30 minutes, and then rinsed with running water for 30 seconds. A 1% aqueous solution of sodium dodecyl sulfate was then applied to the hair bundle in an amount equal to the weight of the hair bundle, which was then rubbed and washed for 30 seconds, and then rinsed again with running water for 30 seconds. The resulting hair bundle was wiped dry with a towel and completely dried with a hair dryer.

[0055] 3. Hair evaluation Thirty hairs were randomly selected from the hair bundle obtained by the above process and used to prepare samples for tensile testing using brass clamps. The samples were previously measured for their major and minor diameters perpendicular to the fiber axis using a laser shape measuring device. The samples were then immersed in purified water for more than 12 hours, placed in a fully automatic tensile testing machine (Dia-Stron), and stretched at a constant speed of 3 mm / min until the hair broke. Using the obtained stress-strain curve and the hair diameter data of the sample, the work of breaking of the sample (MJ / m 3 ) was calculated. In addition, the ratio (%) of the work of breaking of the treated hair to the work of breaking of the untreated hair was calculated. The breaking work is the energy per unit volume required until hair is broken by stretching, and the higher this value, the more difficult the hair is to break.

[0056] 4.Results (1) Series 1 The formulations, pH and evaluation results of the compositions of Examples 1a to 3a and Comparative Examples 1a to 3a are summarized in Table 1. The formulations, pH and evaluation results of the compositions of Examples 1b to 2b and Comparative Examples 1b to 2b are summarized in Table 2. The breakage work of untreated hair used in the evaluations shown in Tables 1 and 2 was 64.4 MJ / m 3 It was.

[0057] [Table 1]

[0058] [Table 2]

[0059] As shown in Tables 1 and 2, the work of breaking of hair treated with the compositions of Examples 1a to 3a, 1b, and 2b, which contained components (A) and (B), was improved by approximately 4% to 10% compared to the work of breaking of untreated hair. It is generally believed that alkalinity and oxidizing agents (hydrogen peroxide) damage hair and reduce its strength, but it was confirmed that the work of breaking of hair treated with the composition of the present invention was improved. On the other hand, the compositions of Comparative Examples 1a to 3a, 1b, and 2b all contained component (A) but not component (B), and in these cases, the work of breaking was lower than in the compositions of the Examples containing components (A) and (B), and the effect of improving the work of breaking was inferior.

[0060] (2) Series 2 Hair compositions containing various ingredients as component (A) were prepared. The formulations, pH, and evaluation results of the compositions of Examples 4 to 8 are summarized in Table 3. The breakage work of untreated hair used in the evaluations shown in Table 3 was 64.4 MJ / m 3 It was.

[0061] [Table 3]

[0062] As shown in Table 3, the work of breaking of hair treated with the compositions of Examples 4 to 8 containing components (A) and (B) was equal to or better than that of untreated hair. The effectiveness of component (A), which included gallic acid, propyl gallate, tannic acid, hydroquinone, and chicoric acid-containing extracts, was confirmed. While alkalinity and oxidizing agents (hydrogen peroxide) are generally thought to damage hair and reduce its strength, it was confirmed that hair treated with the composition of the present invention prevented the loss of hair strength.

[0063] (3) Series 3 Hair compositions containing various ingredients as component (B) were prepared. The formulations, pH, and evaluation results of the compositions of Examples 9 to 13 are summarized in Table 4. The breakage work of untreated hair used in the evaluations shown in Table 4 was 57.1 MJ / m 3 It was.

[0064] [Table 4]

[0065] As shown in Table 4, the work of breakage of hair treated with the compositions of Examples 9 to 13, which contained components (A) and (B), was equal to or better than that of untreated hair. The chelating agents of component (B), EDTA, EDTA-2Na, HEDTA, DTPA5Na, and HEDP, were all confirmed to be effective. While alkalinity and oxidizing agents (hydrogen peroxide) are generally thought to damage hair and reduce its strength, it was confirmed that hair treated with the composition of the present invention inhibited the loss of hair strength.

[0066] (4) Series 4 A hair composition (oxidative hair dye) containing the dye was prepared. The formulation, pH, and evaluation results of the composition of Example 14 are summarized in Table 5. The breakage power of the untreated hair used in the evaluation shown in Table 5 was 61.53 MJ / m 3 It was.

[0067] [Table 5]

[0068] As shown in Table 5, the work of breakage of hair treated with the composition of Example 14, which contained components (A) and (B) and also a dye, was improved compared to the work of breakage of untreated hair. It was confirmed that the same effect could be obtained with a composition containing a dye.

[0069] (5) Series 5 The effects of the presence or absence of component (A) were confirmed. The formulations, pH, and evaluation results of the compositions of Examples 15 and 16 and Comparative Examples 15 and 16 are summarized in Table 6. The breakage work of untreated hair used in the evaluations shown in Table 6 was 59.6 MJ / m 3 It was.

[0070] [Table 6]

[0071] As shown in Table 6, it was confirmed that the breaking work of hair treated with the compositions of Examples 15 and 16, which contained components (A) and (B), showed a greater improvement in hair properties than the breaking work of hair treated with the compositions of Comparative Examples 15 and 16, which had the same composition except that component (A) was not added.

[0072] The present invention is intended to cover a wide range of applications, including those related to the present invention, including those related to the present invention.

Claims

1. (A) one or more selected from the group consisting of catechol, hydroquinone, ferulic acid, resveratrol, polyphenols having two or more 4-hydroxyphenyl groups, polyphenols having one or more 3,4-dihydroxyphenyl groups, and polyphenols having one or more 3,4,5-trihydroxyphenyl groups; (B) a chelating agent; and A hair composition containing

2. moreover, (C) Alkaline agent The hair composition according to claim 1, which contains

3. 3. The hair composition according to claim 2, which has a pH of 8 to 12.

4. moreover, (D) oxidizing agent The hair composition according to claim 1 or claim 2, which contains

5. The hair composition according to claim 4, which is used as an oxidative hair dye or hair bleach.

6. The hair composition according to claim 1, which is used as a first or second agent in an oxidative hair dye or hair bleach.

7. The hair composition according to claim 1, which is used as a first or second agent for hair transformation treatment.

8. A hair treatment method using the hair composition according to claim 1 or 2.

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