CN111246836A - hair treatment - Google Patents

Abstract

The present invention provides a hair treatment agent which has a high hair-correcting effect, has an optimum pH value closer to that of the hair or the scalp than before, is less likely to cause excessive hair convergence, has low irritation to the scalp, and is excellent in use. The hair treatment agent of the present invention contains (a) glyoxylic acid, and (b) at least one selected from the group consisting of gluconolactone and erucalactone, and the compounding ratio (mass ratio) of (a) component:(b) component ) is 1:1 to 20:1, and the pH of the hair treatment agent is in the range of 2.0 to 3.8. The compounding ratio (mass ratio) of the (a) component: (b) component in the hair treatment agent is more preferably 2.5:1 to 10:1. Moreover, it is more preferable that the pH value of a hair treatment agent is the range of 2.5-3.8.

Description

hair treatment

technical field

The present invention relates to a hair treatment agent. More specifically, it relates to a hair treatment agent capable of achieving a high hair-correcting effect (hair-lengthening effect) on irregular hair or curly hair. Since the hair treatment agent of the present invention achieves a high hair-correcting effect and has an optimum pH value closer to that of the hair or scalp than before, the hair treatment agent is less likely to cause excessive hair convergence and less irritating to the scalp.

Background technique

A reducing agent and an oxidizing agent are contained as main components in a general curl correcting agent, and the irregularity of hair is suppressed by the action of these. However, the actions of reducing agents and oxidizing agents are often accompanied by hair damage, impair the smoothness, good combability, dry feeling, and moisturizing feel of the hair, and the treated hair has a poor touch. In addition, the surface of the hair is rough, resulting in an appearance. The luster disappears and the texture of the hair is reduced. The effects of such oxidizing and reducing agents on hair are also widely recognized by general consumers, and become the main reason for intentional avoidance of curly hair correction.

Therefore, the industry expects to develop a hair treatment agent that does not contain a reducing agent or an oxidizing agent and can suppress irregular hair and correct frizz.

As a component for straightening hair instead of a reducing agent or an oxidizing agent, the use of sugar lactones such as gluconolactone has been proposed. Patent Document 1 describes that by combining a sugar lactone and a di- or trivalent carboxylic acid (di- or tricarboxylic acid such as citric acid) in a specific amount, the straightening effect obtained by the sugar lactone is synergistically improved. In addition, the use of lactone derivatives such as erucalactone or stearolactone as a curving agent for hair has also been proposed. Patent Document 2 describes that by applying a lactone derivative to the hair and subjecting it to heat treatment, the lactone derivative reacts and bonds with amino groups contained in the protein of the hair, thereby improving the curling and tangling of the hair. However, the hair-correcting effect achieved by these methods is weak and insufficient, and the original state may be easily restored by repeated shampooing or the like, or dryness or stiffness may be produced after use.

On the other hand, there has also been proposed a method of using glyoxylic acid, which is a monocarboxylic acid, as other hair-correcting ingredients other than sugar lactones or lactone derivatives. For example, Patent Document 3 discloses a method of straightening hair by applying a solution containing glyoxylic acid to hair, leaving it to dry, and applying mechanical force and heat with a hair straightening iron. However, the hair-correcting effect achieved by glyoxylic acid alone is insufficient and not satisfactory.

Therefore, in order to enhance the hair-correcting effect obtained by glyoxylic acid, Patent Document 4 proposes the use of glyoxylic acid in combination with a guanidine salt and/or urea. However, in order to exhibit a sufficient correcting effect, the pH of the hair treatment agent must be in the range of 1.0 to 2.0. Therefore, excessively strong acidity may lead to excessive convergence of the hair, resulting in dryness or stiffness. In addition, strong acid also exerts a large stimulus or burden on the scalp, causing inflammation of the scalp, or reducing the protective function of the scalp in some cases.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Publication No. 2015-517542

Patent Document 2: Japanese Patent Laid-Open No. 2015-124167

Patent Document 3: Japanese Patent No. 5919267

Patent Document 4: Japanese Patent No. 5947340

SUMMARY OF THE INVENTION

Invention to solve problem

The present invention has been made in view of the above-mentioned disadvantages of the prior art, and an object thereof is to provide a hair treatment agent which has a high hair-correcting effect, is gentle and safe on the hair or scalp, and is also excellent in touch.

solution to the problem

The inventors of the present invention have repeatedly studied to solve the above-mentioned problems, and as a result, they have found that high hair straightening can be obtained by using glyoxylic acid in combination with gluconolactone and/or erucolactone in a specific compounding ratio. The present invention has been completed by using a hair treatment agent having an excellent feel without excessively constricting the hair and having less irritation to the scalp and having an optimum pH value closer to that of the hair or scalp than before.

That is, the present invention provides a hair treatment agent containing

(a) glyoxylic acid, and

(b) at least one selected from the group consisting of gluconolactone and erucic acid lactone,

(a) Component: The compounding ratio (mass ratio) of (b) component is 1:1 to 20:1,

The pH of the hair treatment agent is in the range of 2.0 to 3.8.

effect of invention

The hair treatment agent of the present invention is characterized by using glyoxylic acid in combination with gluconolactone and/or erucalactone. As described above, these are known as active ingredients for hair correction. However, the inventors of the present invention have unexpectedly found that, among the ingredients considered to contribute to hair straightening, glyoxylic acid is used in combination with gluconolactone and/or erucolactone at a specific compounding ratio. In the case of , a high hair-correcting effect is also obtained in a pH value range close to the pH value of healthy hair or scalp (about 4 to 5). That is, the hair treatment agent of the present invention can achieve a high hair-correcting effect at a pH value close to that of the hair or the scalp, so it is difficult to cause excessive hair convergence, has low irritation to the scalp, and is particularly excellent in feel and safety.

It should be noted that since glyoxylic acid is a monocarboxylic acid, the combination of glyoxylic acid and gluconolactone or erucic acid lactone in the present invention and its effect cannot be based on the combination of gluconolactone and diacetyl. A combination of monovalent or trivalent carboxylic acid is expected in Patent Document 1 as an essential condition.

Detailed ways

The hair treatment agent of the present invention contains (a) glyoxylic acid and (b) at least one selected from the group consisting of gluconolactone and erucic acid lactone in a specific compounding ratio, and has a specific pH value. Hereinafter, the present invention will be described in detail.

<(a) Glyoxylic acid>

Glyoxylic acid is a kind of carboxylic acid represented by the following formula and having an aldehyde group and a carboxyl group in one molecule.

It has been confirmed that glyoxylic acid has a pH-adjusting effect in addition to a hair-correcting effect, and is widely used in cosmetics and quasi-drugs.

In this specification, the term "glyoxylic acid" includes hydrates or salts of glyoxylic acid in addition to glyoxylic acid. As an example of a hydrate, glyoxylic acid monohydrate is mentioned. Examples of the salts include alkali metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as magnesium salts and calcium salts, tertiary ammonium salts, or quaternary ammonium salts.

The compounding quantity of glyoxylic acid is 1 to 25 mass %, preferably 2 to 20 mass %, and more preferably 2.5 to 15 mass % with respect to the total amount of the hair treatment agent of the present invention in terms of the purity of glyoxylic acid. . If the compounding amount is less than 1 mass %, a sufficient hair-correcting effect cannot be obtained. On the other hand, even if the compounding amount exceeds 25 mass %, the improvement of the hair-correcting effect corresponding to the compounding amount cannot be expected.

<(b) Gluconolactone and Erucic acid lactone>

Gluconolactone is a polyhydroxy acid having a structure in which the hydroxyl group at the 1-position of glucose is substituted with a ketone.

Gluconolactone exists in glucono-delta-lactone (D-glucono-1,5-lactone) and glucono-γ-lactone (D-glucono-1,4-lactone) ), preferably glucono-δ-lactone represented by the following formula.

Gluconolactone is in an equilibrium state with gluconic acid by hydrolysis in the presence of water, and is in a state in which gluconolactone and gluconic acid coexist. Therefore, in this specification, the term "glucono lactone" includes not only glucono lactone but also gluconic acid which is a hydrolysis product.

Erucic acid lactone (γ-docosanoic acid lactone) is a lactone derivative represented by the following formula.

Erucic acid lactone can be chemically synthesized by a known method (for example, the method described in Patent Document 2), and a commercially available product can also be used.

The compounding quantity of gluconolactone and/or erucic acid lactone is 0.1-10 mass % with respect to the total amount of the hair treatment agent of this invention, Preferably it is 0.3-7 mass %, More preferably, it is 0.5-3 mass %. If the compounding amount is less than 0.1 mass %, a sufficient hair-correcting effect cannot be obtained. On the other hand, even if the compounding amount exceeds 10 mass %, the improvement of the hair-correcting effect corresponding to the compounding amount cannot be expected.

In the hair treatment agent of the present invention, it is essential that the compounding ratio (mass ratio) of (a) glyoxylic acid and (b) gluconolactone and/or erucolactone be the component (a): (b) The components are blended so as to be in the range of 1:1 to 20:1. Moreover, by setting this mixing ratio to 1.25:1 to 20:1, more preferably to a range of 2.5:1 to 10:1, both the correction effect and the feel of the treated hair can be further improved.

＜pH value＞

The hair treatment agent of the present invention must have pH in the range of 2.0 to 3.8. If the pH value is less than 2.0, the hair may be excessively convergent or the scalp may be strongly irritated. On the other hand, if the pH value exceeds 3.8, a sufficient correcting effect of the hair cannot be obtained. Moreover, by making this pH value into the range of 2.5-3.8 further, More preferably, it is the range of 3.0-3.7, Especially preferably, it is the range of 3.3-3.6, the feel of use of the hair after a process becomes very favorable.

The alkaline agent for adjusting the pH of the hair treatment agent to the above-mentioned range is not particularly limited, and inorganic bases such as sodium hydroxide and potassium hydroxide, organic bases such as triethanolamine, isopropanolamine, and basic amino acids can be used .

In addition to the above-mentioned (a) and (b) components, the hair treatment agent of the present invention may contain other optional additives generally used in cosmetics, pharmaceuticals, and the like within a range that does not impair the effects of the present invention. As such a component, a thickener, a polyhydric alcohol, a lower alcohol, a surfactant, a fragrance|flavor, a pH adjuster, water, etc. can be contained, for example.

As an optional additive component, for example, by blending a thickener, the usability of the hair treatment agent, such as being less likely to drip, can be improved.

Examples of thickeners include gum arabic, carrageenan, tragacanth, quince seeds (quince), casein, sodium caseinate, dextrin, gelatin, sodium alginate, methylcellulose, Ethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, polyvinyl alcohol, sodium polyacrylate, carboxyvinyl polymer, guar gum, xanthan gum, etc.

When a thickener is blended, it is preferable to adjust the blending amount so that the viscosity of the hair treatment agent becomes 2000 to 5000 mPa·s, for example. Here, the above-mentioned viscosity is a value measured by a Brookfield viscometer at 25°C, more specifically, a value measured by a VDA type viscometer (DIGITAL VISMETRON VDA of Shibaura System Co., Ltd.), rotor No. 1, and rotor No. 2 Or the value measured under the conditions of rotor No. 3, 12 rpm, and 1 minute.

Moreover, usability can be improved by mix|blending a polyhydric alcohol as an optional additive component.

As a polyhydric alcohol, dipropylene glycol, propylene glycol, 1, 3- butanediol, etc. are mentioned.

The dosage form of the hair treatment agent of the present invention is not particularly limited as long as the desired effect can be sufficiently exhibited, and for example, dosage forms such as liquid form, emulsion form, gel form, foam form, and cream form can be adopted.

<How to use the hair treatment agent>

The hair treatment agent of the present invention can correct irregular hair or curly hair and lengthen the hair by treating the hair according to the following steps;

(1) the process of applying the above-mentioned hair treatment agent to the hair;

(2) the process of placing the hair in a smeared state to make the hair treatment agent fully act on the hair;

(3) the process of washing the hair with water and rinsing off the hair treatment agent;

(4) a process of drying the hair; and

(5) A step of correcting hair with a hair-styling iron.

(1) Coating process

The hair treatment agent of the present invention can also be applied to dry hair before shampooing, but is preferably applied to wet hair that has been washed with a shampoo in advance and dried with moisture, since the hair treatment agent can easily penetrate into the hair. Or dry the hair with a towel that wipes off the adhering moisture.

(2) Placement process

After the application of the hair treatment agent, it is left to stand at room temperature (about 25° C.) for 10 to 30 minutes, more preferably 15 to 20 minutes, to allow the hair treatment agent to act on the hair. If the standing time is less than 10 minutes, a sufficient elongation effect of the hair cannot be obtained. On the other hand, even if the standing time exceeds 30 minutes, further improvement of the hair-correcting effect corresponding to the standing time cannot be expected.

(3) Water washing process

Rinse the hair with water or lukewarm water to rinse the hair treatment from the hair. By rinsing the hair treatment agent out of the hair, subsequent hair drying and treatment are facilitated.

(4) Drying process

After washing with water, the water was wiped off with a towel, and then the hair was dried with a hair dryer.

(5) Hair iron process

The hair is straightly stretched while applying mechanical force and heat to the hair with a hair styling iron heated at 140 to 200°C, preferably about 180°C.

Example

Hereinafter, the present invention will be described in more detail with reference to specific examples, but the present invention is not limited to the following examples. In addition, the compounding quantity in the following Examples etc. is shown in mass %, unless there is a special specification. Before explaining each Example concretely, the evaluation method used is demonstrated.

<Evaluation of Correction Degree>

(1) Experimental method

From a Japanese (same person) hair bundle curled into a wavy shape, a hair bundle of 20 cm in length and 0.1 g in weight was prepared that formed two crests when it sags naturally. The samples of each Example or Comparative Example were applied to the hair bundles, left at room temperature for 15 minutes, washed with water for 1 minute, towel-dried, dried with a hair dryer, and permed using a high-temperature hair styling iron set at 180°C. processor processing.

(2) Evaluation method

The treated hair bundle was allowed to hang down, the slope portion of the wave peak remaining on the hair bundle was approximated to a straight line, and the angle (α) of the intersection at the apex portion of the peak was measured. That is, the sharper the peak remaining in the hair bundle is, the closer α is to 0°, and the more the hair bundle extends linearly, the closer α is to 180°.

The degree of correction is calculated by substituting the peak angle thus obtained into the following equation.

Correction (%)=(α/180)×100

On the other hand, if both peaks remained after the treatment, it was considered that there was no correction effect, and the degree of correction was not calculated.

＜Evaluation of touch feeling in use＞

(1) Experimental method

Chinese hair bundles were corrected using the samples of each example or comparative example, and five professional sensory evaluators were asked to evaluate the touch feeling when the hair was touched by hand in three stages according to the following evaluation criteria. The average score of the evaluation results of all members of the professional sensory evaluator was calculated, and the evaluation was performed according to the following evaluation criteria.

(2) Evaluation criteria

Hair is smooth and very tactile: 3 points

The hair is slightly stiff, but feels very good: 2 points

Hair feels dry or stiff, with poor touch: 1 point

(3) Judgment criteria

A: 2.5 points or more

B: 2 points or more and less than 2.5 points

C: Less than 2 points

<Examples 1 to 12 and Comparative Examples 1 to 8>

By mixing each component in purified water and stirring until it becomes uniform, the hair treatment agent which has the composition shown in following Table 1 and Table 2 was prepared.

The hair-correcting effect of the obtained hair treatment agent and the feel in use of the treated hair were evaluated according to the above-mentioned methods.

[Table 1]

[Table 1]

[Table 2]

[Table 2]

In Comparative Example 1 (glyoxylic acid 15% (purity); pH 1.5), since the hair bundle was completely extended and all peaks disappeared (α=180°), the degree of correction was 100%. However, although the hair-correcting effect was excellent, the pH value was 1.5, the irritation or burden on the hair or scalp was too strong, and the feeling of use and safety were poor (Comparative Example 1). In addition, in this formulation, only by increasing the pH value to 3.5, a sufficient hair-correcting effect could not be obtained, and both peaks remained, and the improvement of the feeling in use was not observed (Comparative Example 2). Furthermore, even when urea or guanidine hydrochloride, which are known to enhance the hair-correcting effect of glyoxylic acid, was blended, sufficient hair-correcting effect and feeling in use were not obtained when pH was set to 3.5 (Comparative Examples 3 and 4).

On the other hand, when glyoxylic acid and gluconolactone are combined in a mixing ratio of 1:1 to 20:1, even if the pH value is set to 3.5, a sufficient hair-correcting effect and feel in use are obtained. (Examples 1 to 7). In particular, when the mixing ratio of glyoxylic acid:gluconolactone was 2.5:1 to 10:1 (Examples 1 to 3, 6 to 7), hair correction comparable to strongly acidic conditions (Comparative Example 5) was obtained Effect. The same effect was obtained at pH 2.5 (Example 8), but at pH 4.0, the acidity was too weak to obtain a sufficient hair-correcting effect (Comparative Example 6). In addition, when the compounding ratio of glyoxylic acid and gluconolactone was not within the above-mentioned range, both the hair-correcting effect and the feeling in use were insufficient (Comparative Example 7).

The hair-correcting effect and feeling of use achieved by the present invention were not affected by the presence or type of the thickener (Examples 9 to 12).

In addition, only by mixing gluconolactone alone, a sufficient hair-correcting effect and feeling in use could not be obtained (Comparative Example 8).

<Examples 13 to 23 and Comparative Examples 9 to 11>

Hair treatment agents having compositions shown in Tables 3 and 4 below were prepared by mixing each component in purified water and stirring until it became uniform.

According to the above-mentioned method, the hair-correcting effect of the obtained hair treatment agent and the feel in use of the treated hair were evaluated.

[table 3]

[table 3]

[Table 4]

[Table 4]

When glyoxylic acid and erucic acid lactone were combined at a mixing ratio of 1:1 to 20:1, even when the pH value was set to 3.5, sufficient hair-correcting effect and feeling in use were obtained (Example 13 ~18, 20~23). In particular, when the compounding ratio of glyoxylic acid:erucic acid lactone was 2.5:1 to 10:1 (Examples 13 to 15, 17 to 18, and 21 to 23), conditions comparable to strong acidity were obtained (Comparative Example 10) higher hair-correcting effect. The same effect was obtained at pH 2.5 (Example 19), but at pH 4.0, the acidity was too weak to obtain a sufficient hair-correcting effect (Comparative Example 11).

Moreover, if erucic acid lactone was mix|blended independently, sufficient hair-correcting effect and use feeling were not acquired (Comparative Example 9).

Claims (3)

1. A hair treatment agent comprising (a) glyoxylic acid, and (b) at least one selected from the group consisting of gluconolactone and erucic acid lactone, (a) Component: The compounding ratio (mass ratio) of (b) component is 1:1 to 20:1, The pH of the hair treatment agent is in the range of 2.0 to 3.8. 2 . The hair treatment agent according to claim 1 , which has a pH in the range of 2.5 to 3.8. 3 . The hair treatment agent of Claim 1 or 2 whose compounding ratio (mass ratio) of (a) component:(b) component is 2.5:1-10:1.