JP2002020267A - Weakly acidic skin cleansing agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weakly acidic skin cleansing agent excellent in high temperature stability on pH side (acidic side) closer to that of human skin in the weakly acidic skin cleansing agent containing an acylglycine alkali metal salt as a main agent. SOLUTION: This weakly acidic skin cleansing agent is characterized by including 5-35 wt.% acylglycine alkali metal salt, 0.2-6 wt.% acylglutamine alkali salt, an organic acid and water and preferably including the acylglycine alkali metal salt and the acylglutamine alkali salt in a weight ratio of (30:1) to (3:1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a weakly acidic skin cleanser. More specifically, the present invention relates to a weakly acidic skin cleanser which is intended for cleaning dirt and sebum on the skin, has excellent sensory detergency when washing bare skin, and has excellent high temperature stability.

[0002]

2. Description of the Related Art Conventionally, soaps, which are alkali salts of fatty acids, have been used as a cleaning base for the purpose of cleaning the skin.

[0003] Soaps are excellent in cleaning effect, and have excellent effects of giving creamy and rich lather, quick lathering, a refreshing feeling and a refreshing feeling, which are preferable when washing the skin, so that cleansing foams and bath soaps are used. It is widely known that it is applied to many skin cleansing agents as facial soap and the like.

[0004]

However, on the other hand, on the other hand, it is difficult to give a moist and pleasant skin feel after washing, because the feeling of refreshing and refreshing is too strong, and various oils or synthetic surfactants are contained in the washing agent. In fact, even if the measures were taken by prescribing such as the adjustment of the mixing amount of soap and the amount of soap, the moist skin feeling after washing could not be obtained.

[0005] Another characteristic that consumers demand from skin cleansing agents is that they are weakly acidic, close to the pH of bare skin. I couldn't meet my needs.

On the other hand, it has an excellent cleaning effect, has a creamy and rich lather, quickly removes lather, and has a clean feeling.
Gives a pleasant feel when washing the bare skin,
In addition, in order to obtain a mildly acidic skin cleanser that has excellent skin feel after moist washing and meets consumer needs, a weakly acidic skin cleanser containing an acyl glycine alkali metal salt as a cleaning base other than soap Is being developed.

[0007] However, since the acyl glycine alkali metal salt approaches the pH side (acid side) closer to human skin, when the pH is lowered, foaming and high temperature (40 ° C) stability tend to deteriorate.

[0008] From the above viewpoint, the inventor of the present invention presupposes that the dirt removing effect, the sensory cleaning effect, the quick foam removal, and the stability over time (separation, odor, discoloration, etc.) of the base material are satisfied.
As a result of intensive studies to achieve high temperature (40 ° C) stability and creamy and rich foaming, the pH is adjusted by blending acyl glutamate in a specific ratio with acyl glycine alkali metal salt as the main base. The weakly acidic skin cleanser at elevated pH (acid side) closer to human skin (40
° C) and found that creamy and rich foaming can be realized at the same time, and completed the present invention.

An object of the present invention is to provide a weakly acidic skin cleansing agent containing an acyl glycine alkali metal salt as a main component, which is excellent in high-temperature stability on the pH side (acid side) closer to human skin. Is to do.

[0010]

That is, the present invention provides a weakly acidic skin cleanser comprising an alkali metal salt of acylglycine, an alkaline salt of acylglutamate, an organic acid and water. Things.

The present invention also relates to the present invention, wherein the alkali metal salt of acyl glycine is 5 to 35% by weight and the alkali salt of acyl glutamic acid is 0.2 to 6% by weight based on the total amount of the weakly acidic skin cleanser.
The present invention provides the above-mentioned weakly acidic skin cleanser, which is contained and is in the form of a paste.

Further, the present invention provides the above-mentioned weakly acidic skin cleanser, wherein the content ratio of the alkali metal salt of acylglycine and the alkali salt of acylglutamic acid is from 30: 1 to 3: 1 by weight. Is provided.

Further, the present invention provides the above-mentioned weakly acidic skin cleanser, further comprising a water-soluble compound having a hydroxyl group.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail.

The acyl glycine alkali metal salt used in the present invention is solid at room temperature, has excellent stability, has good compatibility with dirt, and is clean even when washed with water.
It has a refreshing feel, is easy to wash off, gives a moist skin feel after use, and is optimal as an active agent for skin cleansing.

The carbon chain length of the acylated moiety is 10
To 18 are preferable, and more preferably 12 to 14. When the number of carbon atoms is less than 10, the viscosity of the detergent base decreases and foaming decreases. When the carbon number exceeds 18, the hardness of the detergent base increases and foaming decreases. In addition, linear, branched and saturated, can be used regardless of unsaturated,
A straight chain is preferred in terms of foaming, and a saturated one is preferred in terms of stability of the base. Particularly preferred are a linear acyl group having 12 carbon atoms and a coconut oil fatty acid acyl group containing the same as a main component.

As the salt of the acyl glycine alkali metal salt, there are sodium salt, potassium salt and the like, which can be arbitrarily selected. In a face wash such as a cleansing foam, the sodium salt is particularly preferable in terms of usability. It is. In the detergent formulation, the acylglycine alkali metal salt may be a mixture of acylglycine and an alkali neutralizer such as caustic soda, and the acylglycine alkali metal salt may be included in the formulation. In this case, the neutralization ratio is not necessarily 100%, and acyl glycine and an acyl glycine alkali metal salt may coexist.

The most preferred N-acylglycine sodium salt is a known amino acid surfactant having the following structure, which is formed from glycine which is a main component of human skin collagen and a fatty acid such as coconut oil fatty acid.

Embedded image RCONHCH ₂ COO—Na ⁺ (R represents a straight-chain or branched saturated or unsaturated hydrocarbon group having 9 to 17 carbon atoms.)

The compounding amount of the acylglycine alkali salt varies depending on the intended dosage form of the skin cleanser, but 1 to 20% by weight in the case of a liquid and 5 to 5% in the case of a paste, based on the total amount of the skin cleanser. 50% by weight, 40 to 90 in solid form
% By weight. If the amount is less than 10% by weight, the detergency and foaming power may be insufficient, so that it is necessary to use the surfactant together with another surfactant having a foaming / cleaning function. Further, if the content exceeds 90% by weight, no further effect can be expected, which is economically disadvantageous and is not preferable in terms of stability and safety. Taking into account the simplicity of use and the fact that the effects of the present invention are easily exerted, a paste containing 5 to 25% by weight is particularly preferable.

In the alkali salt of acyl glutamic acid used in the present invention, the carbon chain length of the acylated portion is preferably from 10 to 18, more preferably from 12 to 14. 10 carbon atoms
If the amount is less than 1, the viscosity of the detergent base decreases and the foaming decreases. If the carbon number exceeds 18, the hardness of the detergent base increases and the foaming decreases. Although it can be used irrespective of straight chain, branched, saturated or unsaturated, straight chain is preferred in terms of foaming, and saturated is preferred in terms of stability of the base. Particularly preferred are a linear acyl group having 12 carbon atoms and a coconut oil fatty acid acyl group containing the same as a main component.

Examples of the alkali salt include a sodium salt, a potassium salt, a triethanolamine salt and the like. In the detergent formulation, the acyl glutamate alkali salt may be a mixture of acyl glutamate and an alkali neutralizing agent such as caustic soda, and the formula may be an acyl glutamate alkali salt. In this case, the neutralization ratio is not necessarily 100%, and acyl glutamic acid and an alkali acyl glutamic acid salt may coexist.

The amount of the alkaline salt of acylglutamic acid is 0.2 to 6.0% by weight based on the weakly acidic skin cleanser.
Be blended. The content ratio of the alkaline salt of acylglutamic acid to the alkaline salt of acylglutamic acid is 30: 1 by weight.
It is preferred to be blended so as to be in the range of ３3: 1. More preferably, 0.2 to 6% by weight of an acyl glutamic acid alkali salt is blended so as to satisfy the above range with respect to 5 to 35% by weight of an acyl glycine alkali metal salt.

The weakly acidic skin cleanser of the present invention comprises water and pH
An organic acid is added to make the acid weakly acidic. In the present invention, weakly acidic means a pH in a range of about 5 to 6.99, which is a weakly acidic region close to human skin pH (about 5.5). The pH is adjusted with an organic acid.
Adjusted to 3-6.8.

Examples of the organic acid include citric acid, succinic acid, lactic acid, malic acid, glutamic acid, aspartic acid, pyrrolidone carboxylic acid, tartaric acid, glycolic acid and the like.

The amount of water and the organic acid is appropriately determined according to the dosage form of the skin cleanser. By adding water and an appropriate amount of an organic acid to the skin cleanser composition, the total amount becomes 100% by weight.
And

It is preferable that the weakly acidic skin cleansing composition of the present invention further contains a water-soluble compound having a hydroxyl group.
These are lower alcohols, polyhydric alcohols and their ethylene glycol adducts, propylene oxide adducts and the like. Specifically, for example, ethyl alcohol,
Isopropyl alcohol, butanol, propylene glycol, isopropyl glycol, 1,3-butanediol, dipropylene glycol, glycerin, diglycerin, polyglycerin, trimethylolpropane, erythritol, pentaerythritol, sorbitan, sorbitol glucose, maltitol, saccharose, trehalose, Fructose and the like, and derivatives thereof such as an ethylene oxide adduct and a propylene oxide adduct. In particular, glycerin, 1,3 butanediol, etc. have the effect of removing dirt, creamy and rich foam,
Quick foam removal, refreshing, refreshing skin wash effect,
Desirable for moist skin feel after washing and stability of base over time (separation, discoloration, discoloration, etc.). These are used alone or in combination of two or more. The amount of the water-soluble compound containing a hydroxyl group is preferably 1 to 50% by weight based on the total amount of the detergent. Particularly preferably 5 to 4
0% by weight.

The slightly acidic skin cleansing composition of the present invention may contain a small amount of oil. When the oil is blended, the bare skin washing effect such as a refreshing feeling and a refreshing feeling is reduced, but the skin feeling after the moist washing is enhanced. The oil component here refers to, for example, hydrocarbons, higher alcohols, higher fatty acids, higher alcohol higher fatty acid esters, animal and vegetable fats and oils, cholesterol fatty acid esters, silicones, and the like. Specifically, liquid paraffin, polyisobutene , Isostearyl cholesteryl ester, 2-ethylhexanoic acid triglyceride, 2-ethylhexanoic acid hexadecyl, myristate octadecyl, olive oil,
A chain or cyclic methylpolysiloxane may, for example, be mentioned.

The weakly acidic skin cleansing composition of the present invention includes a cleansing composition,
Components commonly used in cosmetics and the like, for example, thickeners, ionic surfactants, medicinal agents, moisturizing components, anti-inflammatory agents, bactericides, preservatives, ultraviolet absorbers, antioxidants, organic and inorganic powders It is manufactured by blending a body, a pigment, a fragrance and the like as needed, and forming a liquid, paste, or solid by a conventional method.
The compounding composition of each component is appropriately determined by a compounding test of each component usually performed by a person skilled in the art.

The weakly acidic skin cleanser of the present invention has a dirt removing effect, a sensory cleansing effect, a creamy and rich lather,
It quickly realizes all of the rapid foam removal, the stability with time of the base (separation, discoloration, discoloration, etc.) and the property stability at high temperature (40 ° C.).

[0030]

Next, the present invention will be described with reference to examples, but the present invention is not limited to these examples. The compounding amount is% by weight.

With respect to the skin cleanser prepared using the components shown in Table 1, foaming, ease of rinsing, refreshing skin cleansing effect, and sensory cleansing effect were evaluated according to the following evaluation criteria. The results are shown in Table 1.

[0032]

[Table 1]

[Preparation method]
Mix uniformly with a high-speed mixer under heating conditions of 60 ° C to 80 ° C. After defoaming, filtering and cooling, it is used as a skin cleanser.

[Evaluation Method and Evaluation Criteria] After washing and drying the bare skin of 18 healthy female panels (20 to 45 years old), 0.5 g of petrolatum was uniformly applied to the face, and 30 minutes later, the examples of the present invention were used. Then, the face was washed using Comparative Examples, and the foaming property, ease of rinsing, refreshing feeling, and sensory washing effect were evaluated. Each evaluation was performed by setting the evaluation score at 100 points and taking the average score of 18 persons.

[Bubbling] ◎: Evaluation point of 75 points or more (very good foaming) ○: Evaluation point of 50 to 75 points (good foaming) Δ: Evaluation point of 25 to 50 points (somewhat bad foaming) ×; Evaluation point 25 points or less (poor foaming) [Ease of rinsing] ；; Evaluation point 75 points or more (very easy to rinse) ○; Evaluation point 50 to 75 points (easy to rinse) △; Evaluation point 25 to 50 Points (easy to be too easy) ×: Evaluation point 25 points or less (very easy to rinse.) [Refreshing skin washing effect] ；; Evaluation point 75 points or more (very refreshing.) ○: Evaluation points 50 to 75 Point (refreshing) Δ: Evaluation point 25 to 50 points (a slight residual feeling is felt) ×: Evaluation point 25 points or less (a considerable remaining feeling is felt) [Sensory cleaning effect] ；: Evaluation point 75 (The cleaning effect is very high.) 50-75 points △ (cleaning effect is high.); Evaluation point 25-50 points (slightly cleaning effect high.) ×: less evaluation points 25 points (no at all cleaning effect.)

[PH Measurement] The samples of Examples and Comparative Examples were dissolved in ion-exchanged water to prepare 1% aqueous solutions. The 1% aqueous solution sample was measured at 25 ° C with a pH meter (Castany LAB pH meter F-13: manufactured by Horiba, Ltd.).

[Evaluation Method and Evaluation Criteria of Stability] The samples of Examples and Comparative Examples were filled into glass bottles (with lids) until the 9th minute, and left in a thermo-hygrostat at 40 ° C. and 75% humidification. Was observed and evaluated after 4 weeks according to the following evaluation criteria. ◎; no change in state even after 4 weeks. ほ と ん ど: little change in state even after 4 weeks. Δ: change in state after 4 weeks. ×: significant change in state after 4 weeks.

[Evaluation Results] In Table 1, Comparative Example 1 had poor foaming and slightly poor stability after 4 weeks at 40 ° C., whereas Example 1 in which N-coconut oil fatty acid acylglutamate sodium salt was blended exhibited foaming. Stability has been improved,
Furthermore, the pH was closer to the pH of human skin (about 5.5). Example 2 also foams more than Comparative Example 2 and has improved stability. Comparing Example 2 with Comparative Example 2, N-
The total amount of both coconut oil fatty acid acylglycine sodium salt and N-coconut oil fatty acid gluglutamate sodium salt is 13%, but Example 2 in which N-coconut oil fatty acid acylglutamate sodium salt is blended in 2% is more preferable. It can be seen that both the foaming stability is improved. Example 3
Even when comparing Comparative Example 3 with Comparative Example 3, foaming stability of Example 3 in which N-coconut oil fatty acid acylglutamate sodium salt was blended was improved. From Comparative Example 3, citric acid was increased in order to bring the pH closer to that of human skin (Comparative Examples 4 and 5), but the foaming was further decreasing. That is, it was found that the foaming stability was improved by the acylglutamate while the pH was closer to the pH value of human skin. When citric acid was removed compared to Example 3, pH
Is 7 or more, and separation occurs at a high temperature, resulting in poor stability (Comparative Example 6). In Comparative Example 7, although the composition ratio of N-coconut oil fatty acid acylglycine sodium salt and N-coconut oil fatty acid acylglutamate sodium salt was changed, foaming was slightly lowered and stability was not good. In Comparative Example 8, the alkali metal salt (sodium salt) of acylglycine was replaced with a triethanolamine salt, but it did not become a paste-like detergent.

Other examples of the weakly acidic skin cleanser of the present invention will be described below.

<Example 4> Paste-like detergent (containing acylglutamic acid) N-coconut oil fatty acid acylglycine sodium salt 20% by weight N-coconut oil fatty acid acylglutamic acid potassium salt 2 Hydroxyalkyl ether carboxylate 5 Glycerin 30 citrate Acid 1 preservative appropriate amount water residue

<Example 5> Paste detergent (acylglutamic acid compounding system) N-coconut oil fatty acid acylglycine sodium salt 20% by weight N-coconut oil fatty acid acylglutamic acid TEA salt 4 Sodium hydroxyalkyl ether carboxylate 5 Glycerin 30 Citric acid Acid 1 preservative appropriate amount water residue

Example 6 Paste-like detergent (containing acylglutamic acid) N-coconut oil fatty acid acylglycine sodium salt 20% by weight N-lauroylglutamic acid sodium salt 5 Sodium hydroxyalkyl ether carboxylate 5 Glycerin 30 Lactic acid 2 Preservative Appropriate amount of water residue

<Example 7> Pasty detergent (containing acylglutamic acid) N-coconut oil fatty acid acylglycine sodium salt 20% by weight N-lauroylglutamic acid sodium salt 5 acylmethyltaurine sodium salt 5 glycerin 30 citric acid 1 preservative Appropriate amount of water residue

<Example 8> Liquid detergent (containing acylglutamic acid) N-coconut oil fatty acid acylglycine potassium salt 12% by weight N-lauroylglutamic acid dipotassium salt 3 Acylmethyltaurine sodium salt 5 Glycerin 5 Succinic acid 1 Preservative Appropriate amount Water residue

Example 9 Solid Washing Agent (Acyl Glutamic Acid Blended System) N-coconut Fatty Acid Acylglycine Sodium Salt 70% by Weight N-coconut Fatty Acid Acylglutamate Sodium Salt 15 Cetyl Alcohol 5 Stearic Acid Monoglyceride 5 Lanolin Derivative 0. 2 Citric acid 4 Corn starch Appropriate amount Perfume Appropriate amount Dye Appropriate amount Antioxidant, sequestrant Appropriate amount Purified water residue

Example 10 Solid Washing Agent (Acyl Glutamic Acid Blended System) N-coconut Fatty Acid Acylglycine Sodium Salt 55% by Weight N-coconut Fatty Acid Acylglutamate Sodium Salt 10 Cetyl Alcohol 7 Stearic Acid Monoglyceride 10 Lanolin Derivative 1 Quin Acid 4 Corn starch Appropriate amount Perfume Appropriate amount Dye Appropriate amount Antioxidant, sequestering agent Appropriate amount Purified water residue

<Example 11> Powdered detergent (acylglutamic acid-containing system) N-coconut oil fatty acid acylglycine sodium salt 60% by weight N-coconut oil fatty acid acylglutamic acid sodium salt 15 Talc 9 Citric acid 4 Corn starch Appropriate amount Perfume Appropriate amount Dye Appropriate amount Antioxidant, sequestering agent Appropriate amount Purified water residue

[0048]

According to the present invention, there is provided a weakly acidic skin cleansing agent containing an acyl glycine alkali metal salt as a main component, which is excellent in high-temperature stability on a pH side (acid side) closer to human skin. Can be provided. The weakly acidic skin cleansing agent of the present invention is a cleansing agent excellent in a dirt removing effect, a sensory cleaning effect, a quick foam removal, a creamy and rich foaming effect.

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Claims (4)

[Claims] 1. A weakly acidic skin cleanser comprising an alkali metal salt of acylglycine, an alkaline salt of acylglutamic acid, an organic acid, and water. 2. The method according to claim 1, wherein said paste contains 5 to 35% by weight of an alkali metal salt of acylglycine and 0.2 to 6% by weight of an alkali metal salt of acylglutamic acid based on the total amount of the weakly acidic skin cleanser. The weakly acidic skin cleanser according to claim 1, 3. The content ratio of the alkali metal salt of acyl glycine to the alkali salt of acyl glutamic acid is 3% by weight.
The weakly acidic skin cleanser according to claim 1 or 2, wherein the ratio is from 0: 1 to 3: 1. 4. The weakly acidic skin cleanser according to claim 1, further comprising a water-soluble compound having a hydroxyl group.