JPH0578229A - Hair bleaching agent - Google Patents

Abstract

PURPOSE:To provide a hair bleaching agent capable of moderately bleaching hair without using oxidizing agent, free from the damage on hair and stimulation to scalp and giving extremely excellent bleached hair free from the change of the brightness of hair after bleaching. CONSTITUTION:The objective new-type hair bleaching agent free from oxidizing agent and having the above effects can be produced by compounding (A) ascorbic acid or its derivative, preferably ascorbic acid or a higher fatty acid ester of ascorbic acid such as ascorbyl stearate, ascorbyl palmitate and ascorbyl dipalmitate as an essential component in an amount of usually 0.1-30wt.% (preferably 1-25wt.%) and preferably further (B) an organic acid such as citric acid, tartaric acid, lactic acid, succinic acid, malic acid and acetic acid in an amount of e.g. 0.01-5wt.% and adjusting the pH of the hair bleaching agent to usually 1.5-8, preferably 2-7.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a hair bleaching agent, and more particularly to a new type of hair bleaching agent which does not use an oxidizing agent.

[0002]

2. Description of the Related Art Conventionally, various types of hair depigmenting agents are commercially available, and the following three-part to one-part types are generally known.・ Three-agent type ... First agent (liquid) alkali agent, surfactant Second agent (liquid) oxidizing agent Activator (powder) peroxide Add activator to the first agent at the time of use, then second agent Mix with the agent.

Two-agent type ... First agent (liquid) alkali agent, surfactant, peroxide Second agent (liquid) oxidizer The first agent and the second agent are mixed when used.・ Two-agent type ... First agent (powder) alkali agent, thickener, and / or
Alternatively, when using a peroxide second agent (liquid) oxidizing agent, the first agent is added to the second agent.

1-agent type (powder) oxidizing agent, alkaline agent,
Thickener, peroxide When used, dissolve in water.・ One-agent type (liquid) oxidizing agent However, all of these hair decolorizing agents contain an oxidizing agent and decolorize black hair to brown to yellow by oxidatively decomposing melanin granules by nascent oxygen. However, since the melanin granules are present in the cortex or medulla of the hair, there is a problem that the hair keratin itself is also oxidized during the decolorization process. Regarding this, for example, J. SOC. Cosmet. Chem. Vol. 1
7, 1966, P687 (H. Zahn), it is reported that the oxidation of keratin first occurs at the cystine bond, and also in Vol. 20, 1969, P
555 (C. Robbins et al.) Reported that other amino acid residues were also slightly oxidized.

As described above, in the decolorization of hair utilizing nascent oxygen, not only oxidative decomposition of melanin granules but also
As a result, serious damage is also caused to the hair keratin, and therefore, the decolorizing treatment causes the hair to become dull, dull, and broken, resulting in dull hair. Further, there is also a drawback that the melanin pigment gradually flows out even after bleaching, and the color of hair gradually becomes brighter.

[0006]

In view of the above situation, the present invention provides a hair bleaching agent that can decolorize hair without using an oxidizing agent, and that does not damage hair or irritate the scalp. The purpose is to provide.

[0007]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventor has found that ascorbic acid or a derivative thereof has a decolorizing effect on hair, and when it is applied to hair, The present invention has been completed by finding that the hair is not damaged, has a glossy and moist finish, and that the color of the hair does not change brightly even after decolorization.

The structure of the present invention will be described in detail below. The target ascorbic acid or a derivative thereof in the present invention, ascorbic acid, ascorbate salts such as sodium ascorbate, ascorbyl stearate, ascorbyl palmitate, ascorbyl higher fatty acid ester such as ascorbyl dipalmitate, ascorbic acid. Examples thereof include ascorbic acid ester such as magnesium phosphate, ascorbic acid sulfate disodium salt, ascorbic acid acetic acid ester, ascorbic acid benzoic acid ester, and erythorbic acid. Among these compounds, the most preferable ones from the viewpoint of hair decolorizing action are ascorbic acid and ascorbic acid higher fatty acid ester.

The amount of ascorbic acid or its derivative incorporated into the hair decolorizing agent is usually 0.1 to 30% by weight, preferably 1 to 25% by weight, more preferably 2 to 20% by weight. If the blending amount is too small, a good hair decolorizing effect cannot be obtained, and conversely, if the blending amount is too large, the effect does not change and it is not economical.

In the present invention, it is desirable to use an organic acid in combination with the above-mentioned ascorbic acid or its derivative because a more excellent hair decolorizing effect can be obtained. In this case, the organic acid usually includes citric acid, tartaric acid, lactic acid, succinic acid, malic acid, acetic acid and the like. .. The blending amount is, for example, 0.01 to 5% by weight. With the addition of this organic acid, the pH of the hair decolorizing agent is usually 1.5-
It is adjusted to 8, preferably 2 to 7.

Further, various known additives can be added to the hair bleaching agent of the present invention. Examples of these additives include surfactants, thickeners, polypeptides and the like. As the surfactant, there are usually mentioned cationic surfactants, anionic surfactants, nonionic surfactants and amphoteric surfactants. Among them, the penetration of ascorbic acid or its derivatives into hair is recommended. Nonionic surfactants are preferred for good promotion. Examples of the thickener include starch, seaweed, sodium alginate, methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate, guar gum, quaternary nitrogen-containing cellulose ether, xanthan gum and the like. Be done. Further, as the polypeptide, collagen, keratin, elastin, fibroin, conchiolin, soybean protein, acid such as soybean protein, casein, a hydrolyzate obtained by further hydrolyzing an enzyme,
And cation-denatured proteins obtained by quaternizing these. In addition, glycols such as propylene glycol, alcohols such as ethanol and propanol, water-soluble silicone and the like can be blended as necessary.

The hair bleaching agent of the present invention has a dosage form of powder, liquid,
It may take various forms such as cream, gel, paste, aerosol, aerosol foam, mist and the like, and in particular, a dosage form which does not come into contact with air such as aerosol and aerosol foam is preferable in terms of stability. In this case, it can be prepared according to a conventional method using a known atomizing gas.

[0013]

EXAMPLES Next, the present invention will be explained more specifically with reference to examples, but the present invention is not limited to the description of the following examples unless it exceeds the gist. Example 1 A mist-like hair decolorizing agent was prepared by mixing the respective components in the proportions shown below. The pH of this hair decolorizing agent was 3.0.

Ascorbyl stearate 10.0% by weight Citric acid 0.1 〃 Propylene glycol 10.0 〃 Nonionic surfactant 10.0 〃 Plant extract 10.0 〃 Purified water Residual amount ─────── ─────────────────── 100.0% by weight Using this hair bleaching agent, a panel test was conducted for bleaching effect, hair damage, and scalp irritation. The effects are shown in Table 1. Comparative Example 1 Table 1 shows the results of the method of Example 1 in which purified water of 100% was used as a control. Comparative Example 2 Table 1 shows the results obtained by using a 3% hydrogen peroxide aqueous solution for comparison in the method of Example 1.

[0015]

[Table 1]

Note) Evaluation method (1) Decolorizing effect Each hair decolorizing agent was applied to a hair bundle collected from 10 panelists, allowed to stand for 8 hours, shampooed and dried, and then according to the following criteria. It was evaluated and the most frequent results are shown in the table.

<Evaluation Criteria> ⊚: The hair is considerably brighter than the original hair. ○: Brighter than the original hair. Δ: Lighter than the original hair.

X: The brightness is the same as the original hair. (2) Hair damage The surface of the hair before and after the bleaching operation in (1) above is observed with an electron microscope (magnification: 3,000 times), and the degree of damage to the hair scalp is evaluated according to the following criteria. It was shown to.

◯: No damage is observed as in the case before bleaching. Δ: Slight bumps, cracks, peeling, or other damages are recognized on the hair follicles. X: Significant bumps, cracks, peeling and other damages are recognized on the hair follicles. (3) Irritation to the scalp Irritation to the scalp when each hair bleaching agent was applied to the hair of 10 panelists was evaluated according to the following criteria, and the most frequent results are shown in the table.

◯: There is no irritation to the scalp. Δ: There is some irritation to the scalp. ×: There is irritation to the scalp. Example 2 Ascorbyl palmitate 8.0% by weight Ethanol 10.0 〃 Nonionic surfactant 1.0 〃 Water-soluble silicone 1.0 〃 Plant extract liquid 10.0 〃 Tartaric acid 0.2 〃 Purified water Residual amount ── ────────────────────────── 100.0% by weight The above-mentioned aerosol foam hair bleaching agent was prepared (p.
H = 3.5), and this was applied to hair for decolorization treatment. As a result, the same excellent decolorization effect as in Example 1 was obtained, and hair damage and irritation to the scalp were not observed. Example 3 Ascorbic acid 12.0% by weight Nonionic surfactant 10.0 〃 Cetanol 5.0 〃 Chelating agent 0.5 〃 Disodium hydrogen phosphate 2.0 〃 Purified water Residual amount ────── ────────────────────── 100.0% by weight Prepare the above-mentioned creamy hair color remover (pH = 6.8)
Then, when this was applied to hair and decolorized,
Similar to Example 1, an excellent decolorizing effect was obtained, and hair damage and irritation to the scalp were not observed.

[0021]

EFFECTS OF THE INVENTION According to the present invention, the action of ascorbic acid or a derivative thereof makes it possible to decolorize the hair to a suitable degree, and further, does not damage the hair or irritate the scalp during the decolorization process. The finish of the hair after decolorization is extremely good. Further, the brightness of the hair does not change after decolorization, which is preferable.

Claims (2)

[Claims] 1. A hair bleaching agent comprising ascorbic acid or a derivative thereof. 2. The hair bleaching agent according to claim 1, which is blended together with an organic acid.