Hair cleanser

Abstract

To provide a hair washer that has an effect of protecting the dyed hair from color-fading during its washing.SOLUTION: A hair washer contains component A: zinc glycinate, component B: tannic acid and component C: ampholytic surfactant.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a hair cleanser. [Background technology]

[0002] Dyeing hair can make it look lighter and more youthful. Oxidative hair dyes, which consist of a first agent containing an oxidative dye and an alkaline agent and a second agent containing hydrogen peroxide, are commonly used as hair dye treatments. However, while these oxidative hair dyes offer excellent hair dyeing effects, they also have drawbacks, such as being highly damaging to hair and easily irritating to the scalp.

[0003] In recent years, therefore, hair color treatments, hair manicures, etc. containing direct dyes such as acid dyes, basic dyes, HC dyes, nitro dyes, etc. have been attracting attention as hair dyes that cause little damage to hair and do not irritate the scalp. However, compared to oxidative hair dyes, these hair dyes have the problem that the direct dyes such as acid dyes, basic dyes, HC dyes, nitro dyes, etc. are removed from the hair by daily shampooing, etc., significantly accelerating fading.

[0004] In view of this situation, attempts have been made to prevent dye fading. Specifically, hair cosmetics containing polyphenols for preventing fading have been proposed (Patent Document 1). However, hair cosmetics containing polyphenols are treatment agents for use after hair washing, and are not primarily intended to prevent color fading due to hair washing.

[0005] On the other hand, hair cleansers containing zinc salts and / or zinc complexes of amino acids have also been proposed (Patent Document 2). However, even hair cleansers containing these ingredients have not been able to sufficiently suppress fading caused by washing hair, and are therefore unsatisfactory. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 8-291027 [Patent Document 2] Japanese Patent Application Publication No. 2019-043886 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, the present invention aims to provide a hair wash that exhibits a color fading suppression effect during washing on dyed hair. As a result of extensive research, the present inventors have found that the combined use of zinc glycinate and tannic acid, a specific polyphenol, in a hair wash exhibits a significantly superior color fading suppression effect during washing, and have completed the present invention. That is, the present invention is as follows. [Means for solving the problem]

[0008] The present invention provides [1] Provided is a hair cleanser characterized by containing the following component A, component B, and component C: Ingredient A: Zinc glycine Ingredient B: Tannic acid Component C: Amphoteric surfactant [2] It is preferable that the mass ratio of the component B to the component A (component B / component A) is in the range of 1 / 20 to 5 / 1. [3] It is preferable that the hair cleansing agent of the present invention is substantially free of sodium laureth sulfate and / or sodium lauryl sulfate. [4] The hair cleanser of the present invention is preferably used on hair that has been dyed with a hair dye. [Effects of the Invention]

[0009] The hair cleanser of the present invention exhibits the excellent effect of enhancing the effect of inhibiting color fading during hair washing by using Component A: zinc glycine and Component B: tannic acid in combination with Component C: an amphoteric surfactant. In other words, the hair cleanser of the present invention exhibits an especially remarkable effect of inhibiting color fading on hair that has been dyed with a hair dye.

[0010] Furthermore, the hair cleansing agent of the present invention exhibits the effect of exhibiting excellent formulation stability without causing precipitation, even when Component A: zinc glycine and Component B: tannic acid are used in combination. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described.

[0012] The hair wash of the present invention contains zinc glycinate, tannic acid, and an amphoteric surfactant. In this specification, zinc glycinate will be referred to as "component A," tannic acid will be referred to as "component B," and the amphoteric surfactant will be referred to as "component C."

[0013] The hair cleansing agent of the present invention is characterized by containing at least the above-mentioned component A, component B, and component C.

[0014] The essential components of the present invention, Component A, Component B, and Component C, will be described in detail below.

[0015] [Component A] Component A is zinc glycine, a compound with the INCI name ZINC GLYCINATE (International Cosmetic Ingredient Dictionary and Handbook, 15th Edition, Vol. 3, 2014, p. 3882). In the present invention, the use of component A can exert an excellent effect of inhibiting color fading during hair washing.

[0016] In the present invention, a commercially available product can be used as the component A. The commercially available product of the component A is not particularly limited, and may be a single raw material or a mixed raw material with other components, as long as the desired effect is exhibited. Specific examples of commercially available products include the product name "NIKKOL Glycine Zinc Complex" (manufactured by Nippon Surfactant Industry Co., Ltd.).

[0017] The content of Component A in the hair wash of the present invention is not particularly limited as long as the desired effect can be achieved, but from the viewpoint of achieving a fading-inhibiting effect, it is usually preferably 0.05% by mass to 4.0% by mass, and more preferably 0.1% by mass to 2.0% by mass, based on 100% by mass of the agent. The content of Component A is the amount converted into a pure content.

[0018] In addition, when the above-mentioned component A is used in combination with the component B described below, it is possible to achieve an effect of enhancing the effect of inhibiting color fading during hair washing compared to when component A is used alone.

[0019] [Component B] Component B is tannic acid, a compound whose INCI name is TANNIC ACID (International Cosmetic Ingredient Dictionary and Handbook, 15th Edition, Vol. 3, 2014, p. 3523). In the present invention, by using component B in combination with component A, a significantly superior effect of inhibiting color fading during hair washing can be achieved.

[0020] In the present invention, a commercially available product can also be used as the component B. The commercially available product of the component B is not particularly limited, and may be a single raw material or a mixed raw material with other components, as long as the desired effect is exhibited. Specific examples of commercially available products include "Tannic Acid" (manufactured by Fuji Chemical Industry Co., Ltd.).

[0021] The content of component B in the hair wash of the present invention is not particularly limited as long as the desired effect can be achieved, but from the viewpoint of achieving a fading-inhibiting effect, it is usually preferably 0.1 to 2.0 mass % and more preferably 0.2 to 1.0 mass % relative to 100 mass % of the agent. Note that the content of component B is the amount converted into a pure content.

[0022] The ratio of the content of component B to the content of component A in the hair wash of the present invention (component B / component A) is not particularly limited as long as the desired effect can be achieved. However, from the viewpoint of achieving a significantly superior effect of inhibiting discoloration during hair washing, the ratio preferably falls within the range of 1 / 20 to 5 / 1, and more preferably falls within the range of 1 / 10 to 2 / 1.

[0023] As described above, by using Component A and Component B in combination, it is possible to achieve an excellent effect in inhibiting dye fading, which has not been satisfactory in previous attempts. In particular, by using Component A in combination with Component C described below as a hair cleanser, it is possible to achieve an especially remarkable effect in inhibiting dye fading during hair washing. In addition, even when Component A and Component B are used in combination, it is possible to achieve an excellent effect in that precipitation or the like does not occur, which adversely affects the stability of the formulation.

[0024] [Component C] Component C is an amphoteric surfactant. In the present invention, by using Component C, it is possible to achieve a hair cleansing effect without adversely affecting the dye fading suppression effect achieved by the combined use of Component A and Component B.

[0025] Examples of the component C include glycine-type amphoteric surfactants, aminopropionic acid-type amphoteric surfactants, aminoacetic acid betaine-type amphoteric surfactants, sulfobetaine-type amphoteric surfactants, etc. One of these components C may be used alone, or two or more of them may be used in appropriate combination.

[0026] In the present invention, from the viewpoint of achieving excellent cleaning effects without adversely affecting the color fading prevention effect, it is most preferable to use an aminoacetic acid betaine type amphoteric surfactant among the above-mentioned component C.

[0027] Specific examples of the amino acetic acid betaine type amphoteric surfactant include undecylenamidopropyl betaine, oliamide propyl betaine, oleamide propyl betaine, cocamidopropyl betaine, shea butter amidopropyl betaine, soyamide propyl betaine, palm kernel fatty acid amidopropyl betaine, babassu amidopropyl betaine, myristamidopropyl betaine, meadowfoam amidopropyl betaine, lauramidopropyl betaine, ricinoleic acid amidopropyl betaine, horse oil fatty acid amidopropyl betaine, lauryl betaine, stearyl betaine, dihydroxyethylstearyl betaine, etc. These amino acetic acid betaine type amphoteric surfactants may be used alone or in appropriate combinations of two or more.

[0028] Among the above aminoacetic acid betaine type amphoteric surfactants, it is most preferable to use lauramidopropyl betaine from the viewpoint of maximizing the effect of inhibiting fading of dyes during hair washing, which is a unique effect of the present invention.

[0029] In the present invention, a commercially available product can be used as the component C. The commercially available product of the component C is not particularly limited, and may be a single raw material or a mixed raw material with other components, as long as the desired effect is exhibited. An example of a commercially available product of lauramidopropyl betaine is the product name "Anphorex LB-2" (manufactured by Miyoshi Oil & Fats Co., Ltd.).

[0030] The content of component C in the hair wash agent of the present invention is not particularly limited as long as the desired effect can be achieved, but from the viewpoint of imparting a cleansing effect without adversely affecting the effect of inhibiting discoloration during hair washing, it is usually preferably 4% to 20% by mass, and more preferably 8% to 16% by mass, based on 100% by mass of the agent. Note that the content of component C is the amount converted to a pure content.

[0031] [Other ingredients] In addition to the above-mentioned components, the hair wash composition of the present invention may contain, as appropriate depending on the purpose, surfactants such as anionic surfactants and nonionic surfactants; oils and fats such as silicones, oils and fats, waxes, hydrocarbons, higher fatty acids, higher alcohols, and esters; moisturizers, fragrances, pH adjusters, thickeners, film-forming agents, chelating agents, alcohols, alkaline agents, vitamins, anti-inflammatory agents, hair growth promoters, astringents, antioxidants, preservatives, ultraviolet absorbers, colorants, plant extracts, plant fermentation extracts, purified water, and the like.

[0032] The pH of the hair cleanser of the present invention is not particularly limited as long as it can achieve the desired effect. However, from the viewpoint of maintaining the stability of the formulation and fully suppressing discoloration, it is preferably in the range of 3.0 to 7.0, and more preferably in the range of 4.0 to 6.0. A pH of less than 3.0 is undesirable because the dye is more likely to be eluted from the hair and the hair is less likely to fade. Discoloration is more pronounced in hair dyed with a basic dye. On the other hand, a pH of more than 7.0 is undesirable because tannic acid, the component B, is more likely to precipitate.

[0033] In the present invention, as long as the pH can be adjusted to the above-mentioned range, a pH adjuster may or may not be used. However, if a pH adjuster is used to adjust the pH, for example, phosphoric acid, citric acid, lactic acid, and salts thereof can be used.

[0034] In the hair wash of the present invention, if a specific anionic surfactant commonly used as a surfactant with strong cleansing power is used, direct dyes such as acid dyes, basic dyes, HC dyes, and nitro dyes are likely to come off from hair during hair washing. Therefore, in order to fully exert the effect of inhibiting color fading during hair washing, it is preferable that the hair wash is substantially free of anionic surfactants with strong cleansing power. Specifically, it is preferable that the hair wash is substantially free of sodium laureth sulfate and / or sodium lauryl sulfate. In the present invention, "substantially free" means that sodium laureth sulfate and / or sodium lauryl sulfate are not separately contained, and does not exclude small amounts of sodium laureth sulfate and / or sodium lauryl sulfate contained in each blended ingredient.

[0035] In addition, from the viewpoint of maintaining the stability of the formulation and fully exhibiting the effect of inhibiting color fading during hair washing, the hair wash composition of the present invention preferably contains substantially no cationic surfactant. In the present invention, "substantially no cationic surfactant" means that no cationic surfactant is separately contained, and does not exclude small amounts of cationic surfactant contained in each blended ingredient.

[0036] The form of the hair cleansing agent of the present invention is not particularly limited as long as it can exert the desired effect, but it is preferably in the form of, for example, liquid, gel, cream, mist, wax, or foam.

[0037] The method for producing the hair wash agent of the present invention is not particularly limited, and the agent can be produced by, for example, a known method. Specific examples include a method in which the above-mentioned components are mixed using a known mixing device such as a disper mixer or a paddle mixer, or a method in which the components are emulsified using a homomixer, but the present invention is not limited to these production methods.

[0038] The hair wash of the present invention is preferably used on hair that has been dyed with a hair dye, since it exhibits the effect of suppressing dye fading during hair washing. More specifically, it is more preferably used on hair that has been dyed with a hair dye that contains at least one direct dye selected from acid dyes, basic dyes, HC dyes, and nitro dyes, which are dyes that tend to come off from hair during hair washing, but does not contain an oxidative dye.

[0039] Examples of hair dyes that contain at least one direct dye selected from acid dyes, basic dyes, HC dyes, and nitro dyes and do not contain oxidative dyes include, but are not limited to, hair color treatments and hair manicures.

[0040] The hair cleansing agent of the present invention can be widely used in cosmetics, quasi-drugs, designated quasi-drugs, pharmaceuticals, miscellaneous goods, etc. [Example]

[0041] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. The blending amounts are expressed in "% by mass" unless otherwise specified.

[0042] [Preparation of test hair bundles] Hair dye (1) or hair dye (2) having the following composition was prepared in a conventional manner, and test hair bundles (1) and (2) were prepared by the dyeing method described below.

[0043] <Hair dye (1): Hair color treatment> (mass%) Cetyl alcohol 5.0 Ethylhexyl palmitate 1.0 Steartrimonium bromide 0.6 Stearamidopropyl dimethylamine 0.5 BG 3.0 Isopropanol 0.2 Basic Blue 99 0.5 HC blue 2 0.3 HC yellow 2 0.2 4-hydroxypropylamino-3-nitrophenol 0.2 Ammonium bicarbonate 0.8 Phenoxyethanol 0.3 Refined water residue Total 100.0

[0044] <Hair dye (2): Hair manicure> (mass%) Ethanol 15.0 Benzyl alcohol 6.0 BG 3.0 Citric acid 1.3 Xanthan gum 1.0 Purple 401 0.3 Yellow 4 0.3 Black 401 0.2 Refined water residue Total 100.0

[0045] <Dyeing process> 2.0 g of the above hair dye (1): hair color treatment or hair dye (2): hair manicure was applied to 1.5 g of 11 cm long human gray hair (manufactured by Bealux Co., Ltd.), and the hair was left at 25°C for 10 minutes, then rinsed with tap water and air-dried. The hair bundle thus dyed was used as the test hair bundle. The hair bundle dyed with hair dye (1) was designated as test hair bundle (1), and the hair bundle dyed with hair dye (2) was designated as test hair bundle (2).

[0046] [Sample preparation] Hair washes of Examples 1 to 5 and Comparative Examples 1 to 5 were prepared in accordance with standard methods according to the compositions shown in Table 1 below, and then subjected to the following tests. The results are also shown in Table 1. All blend amounts in the table are values ​​converted to pure components. Liquid formulations were used to more clearly determine whether or not precipitation occurred due to zinc glycine, component A.

[0047] <Test Example 1: Evaluation of formulation stability> Each sample of the Examples and Comparative Examples was sealed in a 50 mL transparent glass container and stored at a constant temperature of 25°C (±2°C) for 24 hours. Thereafter, the appearance was visually observed and evaluated according to the following criteria.

[0048] <Evaluation criteria for formulation stability> ○ (Good): No precipitates observed △ (insufficient): slight deposits observed × (bad): precipitates are clearly observed

[0049] The following Test Example 2 (discoloration confirmation test) was carried out on samples that obtained results other than "X" in the above Test Example 1 (evaluation of formulation stability).

[0050] <Test Example 2: Fading confirmation test> (Washing treatment of test hair bundles) Test hair bundle (1) or test hair bundle (2) was thoroughly wetted with tap water, and 0.5 g of each sample from the Examples and Comparative Examples was applied, then washed thoroughly, rinsed with tap water, and air-dried. The above washing procedure was repeated 10 times, and the degree of discoloration was evaluated using the following evaluation method.

[0051] (Evaluation method: color difference measurement) Using a color difference meter (product name: Color Reader CR-13, manufactured by Konica Minolta Japan, Inc.), the color difference (ΔE value) between the color of the test hair bundle before and after washing for each sample was determined. The smaller the color difference, the less fading there was.

[0052] [Table 1]

[0053] As is clear from Table 1, in Examples 1 to 5, which fulfill the constitution of the present invention, hair dyed with a hair dye containing at least one direct dye selected from acid dyes, basic dyes, HC dyes, and nitro dyes but not containing an oxidative dye did not fade even after washing the hair multiple times. In other words, it is clear that the hair wash of the present invention has an excellent effect of inhibiting hair fade.

[0054] In contrast, the hair wash agents of Comparative Examples 1 and 2, which do not contain zinc glycine and tannic acid, do not fully exhibit the effect of inhibiting discoloration. Furthermore, the combination of zinc glycine with tea leaf extract, which is rich in polyphenols (Comparative Example 3), the combination of zinc glycine with rutin, a polyphenol (Comparative Example 4), and the combination of zinc glycine with logwood extract, a natural dye (Comparative Example 5), all resulted in the precipitation of aggregates when combined with zinc glycine, and it is clear that these agents are unable to exhibit the effect of inhibiting discoloration during hair washing, which is a unique effect of the present invention.

Claims

1. A hair cleanser to be used on hair that has been dyed with a hair dye, characterized in that it contains the following components A, B, and C: Ingredient A: Zinc glycine Component B: Tannic acid Component C: Amphoteric surfactant

2. 2. The hair wash according to claim 1, wherein the mass ratio of component B to component A (component B / component A) is in the range of 1 / 20 to 5 / 1.

3. 3. The hair wash according to claim 1, wherein the hair wash is substantially free of sodium laureth sulfate and / or sodium lauryl sulfate.

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