JP7774782B2 - Hair cleanser - Google Patents

Description

The present invention relates to a hair cleanser.

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.

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.

In view of this situation, attempts have been made to suppress dye fading. Specifically, hair cosmetics containing polyphenols for suppressing 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.

On the other hand, hair cleansing agents containing zinc salts and/or zinc complexes of amino acids have also been proposed (Patent Document 2). However, even hair cleansing agents containing these ingredients have not been satisfactory in sufficiently suppressing color fading caused by washing hair.

Japanese Patent Application Publication No. 8-291027 JP 2019-043886 A

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.

The present invention provides
[1] Provided is a hair cleansing agent comprising the following components A, B, and C:
Component A: zinc glycine, Component B: tannic acid, and Component C: amphoteric surfactant. [2] It is preferable that the mass ratio of Component B to 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.

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. That is, 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.

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.

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

The hair wash composition 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."

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

The components A, B, and C, which are essential components of the present invention, will be described in detail below.

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

In the present invention, a commercially available product can also be used as the above-mentioned Component A. The commercially available product of the above-mentioned 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.).

The content of Component A in the hair wash composition 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 composition. The content of Component A is the amount converted into a pure content.

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

[Component B]
Component B is tannic acid, and is a compound expressed by the INCI name (International Cosmetic Ingredient Dictionary and Handbook, 15th Edition, Vol. 3, 2014, p. 3523): TANNIC ACID. 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 exhibited.

In the present invention, a commercially available product can also be used as the above-mentioned component B. The commercially available product of the above-mentioned 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.).

The content of Component B in the hair wash composition 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% by mass, and more preferably 0.2 to 1.0% by mass, based on 100% by mass of the composition. The content of Component B is the amount converted into a pure content.

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 exhibited. From the viewpoint of exhibiting a significantly superior effect of inhibiting discoloration during hair washing, however, 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.

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.

[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.

Examples of Component C include glycine-type amphoteric surfactants, aminopropionic acid-type amphoteric surfactants, aminoacetic acid betaine-type amphoteric surfactants, sulfobetaine-type amphoteric surfactants, etc. These Component Cs may be used alone or in appropriate combination of two or more.

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.

Specific examples of the amino acetic acid betaine type amphoteric surfactant include undecylenamidopropyl betaine, oliamidopropyl betaine, oleamidopropyl betaine, cocamidopropyl betaine, shea butter amidopropyl betaine, soyamidopropyl betaine, palm kernel fatty acid amidopropyl betaine, babassuamidopropyl 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 combination of two or more.

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.

In the present invention, a commercially available product can also be used as the above-mentioned Component C. The commercially available product of the above-mentioned 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.).

The content of component C in the hair wash composition 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% by mass to 20% by mass, and more preferably 8% by mass to 16% by mass, based on 100% by mass of the composition. The content of component C is the amount converted into a pure content.

[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, waxes, hydrocarbons, higher fatty acids, higher alcohols, esters and other oily agents; 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.

The pH of the hair cleanser of the present invention is not particularly limited as long as it can exhibit the desired effects. However, from the viewpoint of maintaining the stability of the formulation and sufficiently 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.

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, when adjusting the pH with a pH adjuster, for example, phosphoric acid, citric acid, lactic acid, and salts thereof can be used.

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 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.

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.

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.

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.

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.

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.

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

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.

[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.

<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
Purified water remainder
Total 100.0

<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
Purified water remainder
Total 100.0

<Dyeing treatment>
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 white human 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 a 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).

[Sample preparation]
Hair cleansing agents 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 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. Furthermore, a liquid formulation was adopted to more clearly determine whether or not precipitation due to zinc glycine, component A, occurred.

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.

<Evaluation criteria for formulation stability>
○ (Good): No precipitates observed. △ (Insufficient): Slight precipitates observed. × (Poor): Clear precipitates observed.

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).

<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 of the Examples and Comparative Examples was applied, then washed to allow it to soak in, rinsed with tap water, and air-dried.
The above washing procedure was repeated 10 times, and the degree of discoloration was evaluated by the following evaluation method.

(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 the washing treatment for each sample was determined. The smaller the color difference, the less fading there was.

As is clear from Table 1, in Examples 1 to 5, which satisfy 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 exhibits an excellent effect of inhibiting hair fading.

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 fading inhibitory effect. 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 fading inhibitory effect during hair washing, which is a unique effect of the present invention.

Claims (3)

A hair cleanser to be used on hair that has been dyed with a hair dye, characterized by containing the following components A, B, and C:
Component A: Zinc glycine Component B: Tannic acid Component C: Amphoteric surfactant 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. The hair wash according to claim 1, wherein the hair wash is substantially free of sodium laureth sulfate and/or sodium lauryl sulfate.