Composition for suppressing color fading of dyed hair

Abstract

To provide a composition for suppressing color fading of dyed hair, which enables smooth hair washing, can suppress color fading of dyed hair due to the washing, and exhibits excellent stability over time.SOLUTION: A composition for suppressing color fading of dyed hair comprises: (A) 0.001 to 3.5 wt.% of succinoyl arginine or a salt thereof; (B) 3.0 to 12.0 wt.% of hydroxyalkyl(C12-14) hydroxyethyl sarcosine; and (C) 0.5 to 15.0 wt.% of an anionic surfactant, and has a pH from 4.5 to 7.0.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a composition for inhibiting fading of dyed hair, which enables smooth washing of hair, inhibits fading of dyed hair due to washing, and has excellent stability over time. [Background technology]

[0002] As we age, the number of gray hairs increases, and the need to dye gray hair also increases. In addition, changing hair color to various colors as a fashion is desired regardless of age or gender, and the recent development of hair color products has made it possible for anyone to easily dye their hair in various colors. However, repeated washing with shampoo accelerates the fading of dyed hair, making it difficult to maintain the vivid color as immediately after hair coloring. In addition, hair treated with hair color is chemically damaged. Washing hair in this damaged state makes the hair stiff and prone to tangling, which tends to lead to a vicious cycle in which further damage accumulates in the hair. Various studies have been conducted in the past with the aim of suppressing the fading of dyed hair after hair coloring. For example, Patent Document 1 proposes a hair cleansing composition that combines an N-acyl-alkyl taurate salt, an olefin sulfonate salt, and a cationic polymer, but there is room for improvement in the feel of use, such as smoothness of the fingers when washing the hair, and the fading suppression effect was sometimes insufficient. In addition, in Patent Document 2, the feeling of use is improved by combining a cysteine ​​derivative and a surfactant, but there is no mention of the effect of inhibiting fading of dyed hair, leaving room for improvement. On the other hand, in Non-Patent Document 1, it is reported that a hair wash composition using a specific surfactant is excellent in inhibiting fading, but depending on the dye used for dyeing hair, the effect may not be fully exerted. Thus, there is a strong demand for a composition for inhibiting fading of dyed hair that allows smooth washing and fully exerts the effect of inhibiting fading against various hair colors and dyes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2017-78037 [Patent Document 2] Patent 5979154 [Non-patent literature]

[0004] [Non-Patent Document 1] Ryuji Kikuchi, Fragrance Journal, 34, 58-62 (2006). Summary of the Invention [Problem to be solved by the invention]

[0005] In order to solve these problems, the main object of the present invention is to provide a composition for inhibiting fading of dyed hair, which allows smooth washing of hair, inhibits fading of dyed hair due to washing, and has excellent stability over time. [Means for solving the problem]

[0006] As a result of extensive research into solving the above problems, the inventors have found that a composition for inhibiting fading of dyed hair containing succinoyl arginine or a salt thereof, hydroxyalkyl (C12-14) hydroxyethyl sarcosine, and an anionic surfactant in a specific formulation and pH can be used to achieve the desired smoothness during washing, inhibit fading of dyed hair due to washing, and also improve the stability of the composition over time, thereby completing the present invention.

[0007] That is, the present invention is as follows. (1) The composition for inhibiting fading of dyed hair contains (A) 0.001 to 3.5% by weight of succinoyl arginine or a salt thereof, (B) 3.0 to 12.0% by weight of hydroxyalkyl (C12-14) hydroxyethyl sarcosine, and (C) 0.5 to 15.0% by weight of an anionic surfactant, and has a pH of 4.5 to 7.0. (2) The composition for inhibiting fading of dyed hair according to (1), wherein the anionic surfactant (C) is at least one selected from the group consisting of N-acylamino acid salts and anionic surfactants having a strong acid group. (3) The composition for inhibiting fading of dyed hair according to (2), wherein the N-acylamino acid salt or the anionic surfactant having a strong acid group, which is component (C), is at least one selected from the group consisting of N-acylsarcosine salts, N-acylaspartic acid salts, N-acylmethylalanine salts, polyoxyethylene alkyl ether sulfates, and α-olefin sulfonates. (4) A method for inhibiting fading of dyed hair, using a composition comprising 0.001 to 3.5% by weight of succinoyl arginine or a salt thereof, (B) 3.0 to 12.0% by weight of hydroxyalkyl (C12-14) hydroxyethyl sarcosine, and (C) 0.5 to 15.0% by weight of an anionic surfactant, and having a pH of 4.5 to 7.0. Effect of the Invention

[0008] According to the present invention, it is possible to provide a composition for inhibiting fading of dyed hair, which allows hair to be washed smoothly, has an excellent effect of inhibiting fading of dyed hair due to washing, and further has excellent stability over time. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described. The (A) component, succinoyl arginine or a salt thereof, can be, for example, succinoyl arginine Na, which can be obtained by reacting arginine with succinic anhydride. A commercially available product of succinoyl arginine Na is Kawatect (registered trademark) SAS manufactured by Kawaken Fine Chemical Co., Ltd.

[0010] The component (A) is blended for the purpose of improving smoothness during hair washing and suppressing fading of dyed hair due to washing. The component (A) is desirably present in the composition for inhibiting fading of dyed hair of the present invention at 0.001 to 3.5% by weight. From the viewpoint of further improving smoothness during hair washing, the component (A) is more desirably present at 0.1 to 3.0% by weight. If the component (A) is present at less than 0.001% by weight, the composition for inhibiting fading of dyed hair of the present invention may not be effective in inhibiting fading due to washing, and if the component (A) is present at more than 3.5% by weight, the composition for inhibiting fading of dyed hair may become dull over time, deposits may be observed, and other stability may deteriorate.

[0011] An example of a commercially available product of hydroxyalkyl (C12-14) hydroxyethyl sarcosine, component (B), is Softazoline (registered trademark) LMEB manufactured by Kawaken Fine Chemicals Co., Ltd.

[0012] The component (B) is blended for the purpose of improving smoothness during hair washing and suppressing fading of dyed hair due to washing. The component (B) is desirably present in the composition for inhibiting fading of dyed hair at 3.0 to 12.0% by weight. From the viewpoint of further improving smoothness during hair washing, the component (B) is more desirably present at 3.5 to 10.0% by weight. If the component (B) is present below 3.0% by weight, the composition for inhibiting fading of dyed hair of the present invention may not provide smoothness during hair washing or the effect of suppressing fading due to hair washing, whereas if the component (B) is present above 12.0% by weight, the stability over time of the composition for inhibiting fading of dyed hair may be deteriorated.

[0013] Although the components (A) and (B) can provide a certain degree of fading inhibition effect when used alone, a sufficient fading inhibition effect can be achieved by using the two components in combination in a specific ratio.

[0014] In general, hair dyeing with hair colorants uses oxidative hair dyes that contain oxidative dyes as active ingredients. Oxidative dyes are further classified into dye intermediates and toning agents (couplers), and the dye intermediates react with each other or with toning agents (couplers) to produce the designed color. For this reason, various colors are designed by combining the dye intermediates and toning agents (couplers) in the oxidative hair dyes.

[0015] Commonly used dyeing intermediates include pyrazoles, diamines, and aminophenols, such as 1-hydroxyethyl-4,5-diaminopyrazole sulfate, paraphenylenediamine, toluene-2,5-diamine, paraaminophenol, and their derivatives and analogues. Toning agents (couplers) are used together with dyeing intermediates, as they develop color only when they react with the dyeing intermediates. Commonly used toning agents (couplers) include 2,4-diaminophenoxyethanol hydrochloride, α-naphthol, 5-(2-hydroxyethylamino)-2-methylphenol, meta-aminophenol, resorcinol, 2,6-diaminopyridine, 5-aminoorthocresol, and their derivatives and analogues.

[0016] Hydroxyalkyl (C12-14) hydroxyethyl sarcosine, component (B) of the present invention, has already been reported to be excellent at inhibiting fading of hair color (Non-Patent Document 1). However, the inventors' investigations showed that it was particularly effective at inhibiting fading of hair dyed with a hair coloring agent containing a toluene-2,5-diamine type dye intermediate.

[0017] On the other hand, the composition for inhibiting discoloration of dyed hair using the combination of components (A) and (B) of the present invention is also excellent in inhibiting discoloration of dyed hair caused by hair coloring agents containing dye intermediates of other diamine, pyrazole, and aminophenol types in addition to toluene-2,5-diamine type. Specific examples of dye intermediates include 1-hydroxyethyl-4,5-diaminopyrazole sulfate, paraphenylenediamine, and paraaminophenol.

[0018] The anionic surfactant, component (C), is blended in the dyed hair fading prevention composition for the purpose of imparting smoothness during hair washing. The dyed hair fading prevention composition preferably contains one or more types of components (C) in a total amount of 0.5 to 15.0% by weight. From the viewpoint of further improving smoothness during hair washing, the total amount is more preferably 2.5 to 13.0% by weight. If the total amount is less than 0.5% by weight, the composition for inhibiting fading of dyed hair of the present invention may not provide smoothness during hair washing, and if the total amount exceeds 15.0% by weight, the composition for inhibiting fading of dyed hair by hair washing may not provide an effect of inhibiting fading.

[0019] Examples of the anionic surfactant that is the component (C) include an anionic surfactant having an N-acylamino acid salt or a strong acid group, particularly from the viewpoint of imparting smoothness during washing of hair.

[0020] Examples of the N-acylamino acid salts that are the component (C) include N-acyl sarcosine salts, N-acylaspartates, N-acylmethylalanines, N-acylmethyltaurines, N-acylglutamates, and N-acylglycines.Specific examples of the N-acyl sarcosine salts include lauroyl sarcosine salts (available commercially available products include Soypon (registered trademark) SLE and SLTA manufactured by Kawaken Fine Chemicals Co., Ltd.), oleoyl sarcosine salts, cocoyl sarcosine salts (available commercially available products include Soypon (registered trademark) SCE manufactured by Kawaken Fine Chemicals Co., Ltd.), palmitoyl sarcosine salts, and myristoyl sarcosine salts (available commercially available products include Soypon (registered trademark) M-30 manufactured by Kawaken Fine Chemicals Co., Ltd.). Specific examples of N-acylaspartates include lauroyl aspartate, acyl (C12,14) aspartate, myristyl aspartate, myristyl aspartic acid taurine salt, lauryl aspartate, lauryl aspartic acid taurine salt, etc. Specific examples of N-acylaspartates include cocoyl methylalanine salt (available commercially available products include Alanone (registered trademark) ACE manufactured by Kawaken Fine Chemicals Co., Ltd.), myristoyl methylalanine salt (available commercially available products include Alanone (registered trademark) AME manufactured by Kawaken Fine Chemicals Co., Ltd.), lauroyl methylalanine salt (available commercially available products include Alanone (registered trademark) ALE and ALTA manufactured by Kawaken Fine Chemicals Co., Ltd.), cocoyl hydroxyethyl-β-alanine salt, and lauroyl hydroxyethyl-β-alanine salt. Specific examples of N-acyl methyl taurine salts include oleoyl methyl taurine salt, caproyl methyl taurine salt, cocoyl methyl taurine salt, stearoyl methyl taurine salt, palmitoyl methyl taurine salt, myristoyl methyl taurine salt, lauroyl methyl taurine salt, etc.Specific examples of N-acyl glutamate include olive oil fatty acid glutamate, capryloyl glutamate, cocoyl glutamate, stearoyl glutamate, palm fatty acid glutamate, palmitoyl glutamate, myristoyl glutamate, lauroyl glutamate, hydrogenated tallow glutamate, horse oil acyl glutamate, horse oil fatty acid glutamate, (coconut fatty acid / palm fatty acid / sunflower fatty acid) glutamate, (coconut fatty acid / hydrogenated beef tallow fatty acid) glutamate, etc. Examples of N-acyl glycine salts include capryloyl glycine salt, cocoyl glycine salt, palmitoyl glycine salt, lauroyl glycine salt, etc.

[0021] Examples of the anionic surfactant having a strong acid group, which is component (C), include polyoxyethylene alkyl ether sulfates, α-olefin sulfonates, alkyl sulfates, alkyl sulfosuccinates, polyoxyethylene alkyl sulfosuccinates, alkyl sulfonates, internal olefin sulfonates, acyl isethionates, and α-sulfofatty acid methyl ester salts. Specific examples of polyoxyethylene alkyl ether sulfates include laureth sulfate, laureth-2, -3, -5, -7, -8, -12, and -40 sulfate, (C10-15) pareth sulfate, (C11-15) pareth-3 sulfate, (C11-15) pareth sulfate, (C11,13,15) pareth-1 sulfate, (C12-14) s-pareth-3 sulfate, (C12-14) pareth-3 sulfate, (C12-15) pareth-3 sulfate, (C12,13) ​​pareth-3 sulfate, (C12,13) ​​pareth sulfate, oleth sulfate, coceth sulfate, trideceth sulfate, and myreth-3 and -4 sulfate. Specific examples of α-olefin sulfonates include olefin (C14-16) sulfonates, olefin (C12-14) sulfonates, and olefin (C14-18) sulfonates.Specific examples of alkyl sulfates include lauryl sulfate, (coconut oil alkyl / babassu oil alkyl) sulfate, alkyl (C12,13) ​​sulfate, alkyl (C11-15) sulfate, alkyl (C11,13,15) sulfate, alkyl (C12-18) sulfate, alkyl (C12-14) sulfate, alkyl (C12-15) sulfate, alkyl (C12,14,16) sulfate, alkyl (C12-16) sulfate, oleyl sulfate, coco alkyl sulfate, stearyl sulfate, cetyl sulfate, cetearyl sulfate, and myristyl sulfate. Specific examples of the alkyl sulfosuccinate include lauryl sulfosuccinate, diethylhexyl sulfosuccinate, dioctyl sulfosuccinate, and cetearyl sulfosuccinate.Specific examples of polyoxyethylene alkyl sulfosuccinates include sulfosuccinic acid laureth salt, sulfosuccinic acid (C12-14) s-pareth-2, -3, -5, -7, -9, -12 salt, sulfosuccinic acid (C12-14) pareth-1, -2, -4 salt, sulfosuccinic acid (C12-15) pareth salt, and deceth-sulfosuccinate.

[0022] As the component (C), N-acylsarcosine salts, N-acylaspartates, N-acylmethylalanine salts, polyoxyethylene alkyl ether sulfates, and α-olefin sulfonates are expected to have a more effective discoloration suppression effect, and lauroyl sarcosine salts, lauroyl aspartates, lauroyl methylalanine salts, laureth sulfates, and olefin (C14-16) sulfonates are particularly preferred. From the viewpoint of improving the smoothness during washing and the discoloration suppression effect, sodium lauroyl sarcosine, sodium lauroyl aspartate, and sodium lauroyl methyl-β-alanine are even more particularly preferred.

[0023] The pH of the dyed hair fading suppression composition is preferably 4.5 to 7.0. From the viewpoint of further improving the smoothness during washing and the stability over time, it is more preferably 5.0 to 6.5. If the pH is below 4.5, the effect of suppressing fading due to washing with the dyed hair fading suppression composition of the present invention may not be obtained, or the stability over time may be poor. If the pH is above 7.0, the smoothness during washing and the stability over time of the dyed hair fading suppression composition may be poor. Examples of pH adjusters used in the dyed hair fading suppression composition include alkali metal hydroxides such as KOH and NaOH, alkanolamines such as triethanolamine, organic acids such as citric acid, lactic acid, glutamic acid, malic acid, and inorganic acids such as hydrochloric acid, sulfuric acid, and phosphoric acid.

[0024] In addition, the hair wash composition of the present invention may contain other components than those described above, if necessary, within the qualitative and quantitative ranges that do not substantially impair the effects of the present invention. However, it may be necessary to control the amount of components that may inhibit the effects of components (A) to (C) that are added. Furthermore, by-products derived from the components (A) to (C) of the present invention and raw material residues may be present.

[0025] Other components include, for example, nonionic surfactants such as cocamide MEA, cocamide DEA, PPG-2 cocamide, cocamide methyl MEA, etc. Also, cationic polymers such as polyquaternium-10, polyquaternium-7, guar hydroxypropyltrimonium chloride, etc. Further examples of the cosmetic composition include silicones, glycerin derivatives, polyols, sugars or derivatives thereof, moisturizers, water-soluble moisturizing oils, phosphocholine derivatives, lactones, ester oils or derivatives thereof, natural ceramides or derivatives thereof, natural oils, hydrogenated oils, hydrocarbon oils, extracts, natural product extracts, natural product extract components, proteins or hydrolysates thereof, lower alcohols, surfactants, emulsifiers, opacifiers, sequestering agents, ultraviolet absorbers, antioxidants, preservatives, powder components, urethanes, blood circulation promoters, antiseborrheic agents, anti-aging agents, emollients, keratolytic agents, skin conditioning agents, anti-inflammatory agents, anti-inflammatory agents, cooling agents, amino acids or derivatives thereof, vitamins or derivatives thereof, polyphenols, dyes, coloring materials, and fragrances.

[0026] The composition for inhibiting fading of dyed hair of the present invention is in the form of a transparent liquid and can be used in products such as hair cleansers. EXAMPLES

[0027] The effects of the present invention will be described in more detail in the following examples, but the present invention is not limited to these examples, etc. In the examples, unless otherwise specified, the components used were special grade or first grade reagents purchased from Fujifilm Wako Pure Chemical Industries, Ltd.

[0028] Preparation of a composition for inhibiting fading of dyed hair Compositions for inhibiting discoloration of dyed hair having the compositions shown in Tables 1 and 2 were prepared according to known methods (described in "Cosmetic formulation design based on practical applications and responses to formulation-related technologies, published by Johokko Co., Ltd., June 24, 2020"). The pH was adjusted with citric acid and NaOH. The pH was also measured at 25°C using a pH / ION METER (HORIBA, Ltd., LAQUA (registered trademark) F-72). Compositions for inhibiting discoloration of dyed hair described in Examples 1 to 10 and Comparative Examples 1 to 9 were obtained. The numerical values ​​for the compositions in the tables indicate the weight percent of the pure content. The obtained compositions for inhibiting discoloration of dyed hair were evaluated as follows. The results are shown in Tables 1 to 2.

[0029] How to evaluate smoothness when washing hair A hair bundle of 30 cm in length and 5 cm in width (Beaulax, Hair Strand 5, 100% black hair, root aligned) was bleached. The bleached hair was left to stand for 24 hours in a constant temperature and humidity room at a room temperature of 25°C and a humidity of 60% to prepare a hair bundle for evaluation. Ten in-house expert panelists applied 3 g of the dyed hair fading inhibition composition for evaluation prepared in Examples 1 to 10 and Comparative Examples 1 to 9 to the hair bundle for evaluation, washed it, and rinsed it off with hot water at 40°C. The smoothness during washing was evaluated according to the following evaluation criteria. Ranking was based on the average score of the 10 panelists. <Evaluation criteria for smoothness when washing hair> 4: Strong feeling of smoothness 3: Feels slightly smooth 2: Neither 1: No smoothness at all The rankings were as follows: ◎: 4.0 to 3.5, ○: less than 3.5 to 3.0, ×: less than 3.0.

[0030] How to prepare dyed hair A gray hair bundle (BM-W, manufactured by Beaulux Co., Ltd., length 10 cm, weight 1 g) was thoroughly washed with a 2 wt% aqueous solution of sodium laureth sulfate (EMAL (registered trademark) E-27C, manufactured by Kao Corporation), and then dried with a hair dryer. The dried hair bundle was then dyed with a commercially available coloring agent (manufactured by Hoyu Co., Ltd., product name: BEAUTEEN (registered trademark) Makeup Color, colors: navy blue, gray ash, wild red, terracotta orange) using the method specified for the product, thoroughly washed with water, and dried with a hair dryer to prepare a dyed hair bundle for testing. The active ingredients (oxidation dyes) contained in each hair color are as follows. Navy Blue: 2,4-diaminophenoxyethanol hydrochloride, toluene-2,5-diamine, α-naphthol Gray ash: 2,4-diaminophenoxyethanol hydrochloride, toluene-2,5-diamine, para-aminophenol, 5-(2-hydroxyethylamino)-2-methylphenol, meta-aminophenol, resorcinol Wild Red: 5-amino orthocresol, 2,6-diaminopyridine, 1-hydroxyethyl-4,5-diaminopyrazole sulfate Terracotta Orange: 5-amino orthocresol, para-aminophenol, 5-(2-hydroxyethylamino)-2-methylphenol

[0031] Method for evaluating the effect of preventing hair fading due to washing The dyed hair fading inhibition composition samples for evaluation prepared in Examples 1 to 10 and Comparative Examples 1 to 9 were diluted with purified water to 2% by weight. Then, 100 g was poured into a glass container (PS-13K, Daiichi Glass Co., Ltd.), the dyed hair bundle for testing was placed in the container, the container was sealed with a lid, and the container was shaken at room temperature for 24 hours. After 24 hours, the dyed hair bundle for testing was removed from the glass container, thoroughly washed with water, and then dried with a hair dryer. The dyed hair bundle after drying was measured for L and R using a spectrophotometer (Spectrophotometer SE7700, manufactured by Nippon Denshoku Kogyo Co., Ltd.). * , a * , b * The L of the dyed hair bundle before washing was measured. * , a *, b * from ΔE * ab was calculated. Then, the calculated ΔE * ab was evaluated according to the following criteria. <Evaluation criteria for preventing hair discoloration due to washing> ◎:ΔE * ab is 0 or more and less than 3.0 ○:ΔE * ab is 3.0 or more and less than 5.0 △: ΔE * ab is 5.0 or more and less than 7.0 ×:ΔE * ab is 7.0 or more In addition, ΔE * ab indicates the color difference between two points in color space, and can be calculated using the following formula. ΔE * ab = {(ΔL * ) 2 +(Δa * ) 2 +(Δb * ) 2} 1 / 2

[0032] Evaluation method for temporal stability 100 g of each of the compositions for inhibiting discoloration of dyed hair for evaluation prepared in Examples 1 to 10 and Comparative Examples 1 to 9 was dispensed and filled into a glass container (PS-13K, Daiichi Glass Co., Ltd.). After storage at 50° C. for 4 weeks, the appearance was evaluated according to the following criteria. <Evaluation criteria for stability over time> ○: Appearance is colorless and transparent, no change ×: Precipitation present in appearance

[0033] Examples 1 to 10 [Table 1]

[0034] Comparative Examples 1 to 9 [Table 2]

[0035] ※1: Kawatect (registered trademark) SAS (Kawaken Fine Chemical Co., Ltd.), ※2: Softazoline (registered trademark) LMEB (Kawaken Fine Chemical Co., Ltd.), ※3: Ampholex (registered trademark) CB-1 (Miyoshi Oil Co., Ltd.), ※4: Soypon (registered trademark) SLE (Kawaken Fine Chemical Co., Ltd.), ※5: Aminoformer (registered trademark) FLDS-L (Asahi Kasei Finechem Co., Ltd.), ※6: Emal (registered trademark) E-27C (Kao Corporation), ※7: Liporan (registered trademark) LJ-441 (Lion Specialty Chemicals Co., Ltd.), ※8: Alanon (registered trademark) ALE (Kawaken Fine Chemical Co., Ltd.), ※9: Amizole (registered trademark) CME (Kawaken Fine Chemical Co., Ltd.), ※10: Catinal (registered trademark) HC-200 (Toho Chemical Industry Co., Ltd.)

[0036] result Examples 1 to 10, which were prepared within the scope of the composition for inhibiting fading of dyed hair of the present invention, were rated as ○ or better in all evaluations, allowing for smooth washing of hair, and were excellent in inhibiting fading of all dyed hair due to washing, as well as being stable over time. On the other hand, in Comparative Example 1, where the (A) component is out of range, the (B) component is out of range, and the pH is below the range, the fading inhibition effect and stability over time for all dyed hair were inferior. In Comparative Example 2, where the (A) component is below the range and the (B) component is below the range, the smoothness during hair washing and the fading inhibition effect were inferior. In Comparative Example 3, where the (B) component is below the range, the smoothness during hair washing, the fading inhibition effect, and stability over time were inferior. In Comparative Example 4, where the (A) component is below the range and the (B) component is outside the range, the smoothness during hair washing, the fading inhibition effect, and stability over time were inferior. In Comparative Example 5, where the (A) component is below the range, the (C) component is outside the range, and the pH is outside the range, the smoothness during hair washing, the fading inhibition effect, and stability over time were inferior. In Comparative Example 6, where the (C) component is below the range and the pH is below the range, the smoothness during hair washing, the fading inhibition effect, and stability over time were inferior. In Comparative Example 7, in which an amphoteric surfactant other than hydroxyalkyl (C12-14) hydroxyethyl sarcosine (cocamidopropyl betaine) was used as component (B)', the smoothness during washing and the effect of inhibiting discoloration were inferior. In Comparative Example 8, in which component (A) was not blended, the effect of inhibiting discoloration on some dyed hair was inferior. In Comparative Example 9, in which component (C) was outside the range and the pH was below the range, the smoothness during washing, the effect of inhibiting discoloration, and the stability over time were inferior. [Industrial Applicability]

[0037] The composition for inhibiting discoloration of dyed hair of the present invention can be used in products such as hair cleansers to increase the commercial value of products such as hair shampoos. It can also be used in general hair care products aimed at inhibiting discoloration, including hair conditioners.

Claims

1. A composition for inhibiting fading of dyed hair, comprising (A) 0.001 to 3.5% by weight of succinoyl arginine or a salt thereof, (B) 3.0 to 12.0% by weight of hydroxyalkyl (C12-14) hydroxyethyl sarcosine, and (C) 0.5 to 15.0% by weight of an anionic surfactant, and having a pH of 4.5 to 7.

0.

2. 2. The composition for inhibiting fading of dyed hair according to claim 1, wherein the anionic surfactant (C) is at least one selected from the group consisting of N-acylamino acid salts and anionic surfactants having a strong acid group.

3. 3. The composition for inhibiting fading of dyed hair according to claim 2, wherein the N-acylamino acid salt or the anionic surfactant having a strong acid group, which is component (C), is at least one selected from the group consisting of N-acylsarcosine salts, N-acylaspartic acid salts, N-acylmethylalanine salts, polyoxyethylene alkyl ether sulfates, and α-olefin sulfonates.

4. A method for inhibiting fading of dyed hair, comprising using a composition comprising (A) 0.001 to 3.5% by weight of succinoyl arginine or a salt thereof, (B) 3.0 to 12.0% by weight of hydroxyalkyl (C12-14) hydroxyethyl sarcosine, and (C) 0.5 to 15.0% by weight of an anionic surfactant, and having a pH of 4.5 to 7.0.

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