JPH05163129A - Cosmetic - Google Patents

Abstract

PURPOSE:To obtain a cosmetic using urea, succinic acid or its salt and a specific aminocarboxylic acid or further an amino acid or its salt, having excellently softening effects, having improved stability, not emitting an ammonia smell. CONSTITUTION:A cosmetic using an aminocarboxylic acid of the formula [(n) is 3-9] or its salt (especially preferably g-aminocaproic acid), succinic acid or its salt and urea. Further the cosmetic is preferably mixed with an amino acid or its salt (especially specific basic amino acid such as lysine or histidine). By using the compound and urea, the cosmetic economically suppresses rise in pH, has excellently softening effects on skin, especially keratin layer and improved stability. The amount of the succinic acid used is approximately equivalent to that of urea, the amount of the aminocarboxylic acid is about 2/10-4/10 that of urea and the amount of the amino acid is preferably 0.1-3% based on total amount of the cosmetic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention contains urea, succinic acid or a salt thereof and a specific aminocarboxylic acid, and has an excellent softening effect on the skin, especially the stratum corneum, and a cosmetic composition with good stability. Regarding fees.

[0002]

BACKGROUND OF THE INVENTION The stratum corneum, which is the outermost layer of the skin, is liable to dry under severe weather conditions such as low temperature and low humidity in winter, so that the skin becomes dry and bulky or rough. Such phenomena have occurred. Also,
This is also seen with excessive use of detergents and solvents. These changes in the roughness of the skin are caused by the loss of the hygroscopic water-soluble component called NMF (Natural Moisturizing Factor) in the stratum corneum, which reduces the moisture in the stratum corneum and reduces the softness of the stratum corneum. It is believed that this is due to loss of sex. This NMF contains amino acids, organic acids, urea and the like. Therefore, urea and amino acids have been incorporated into cosmetics to supplement these components. However, when urea is simply added to cosmetics, the urea causes a hydrolysis reaction in the system, and in particular,
When stored at high temperature, there is a drawback that the pH rises with time and an ammonia odor is generated. Various studies have been made to solve this problem.

For example, urea blended with an amino acid as a stabilizer (JP-A-59-134707 and JP-A-61-30509), urea blended with a specific protein and a hydrolyzate thereof. (JP-A 61-3310
No. 5, JP-A-61-44806, JP-A-61.
No. 47407), a mixture of urea with a specific aminocarboxylic acid (JP-A-61-204159), and the like. However, these effects were not yet satisfactory in practical use.

Therefore, it has been desired to develop a cosmetic composition containing urea, which has an excellent softening effect on the skin and the stratum corneum, has good stability and does not generate an ammonia odor.

[0005]

In view of such circumstances, the inventors of the present invention have conducted diligent studies to stably blend urea in cosmetics, and found that a specific aminocarboxylic acid and succinic acid or a salt thereof is used. The inventors have found that a combined use of urea and a time-dependent increase in pH can provide a cosmetic material that achieves the above object, and completed the present invention.

That is, the present invention provides the following component (a),
(B) and (c) (a) urea (b) succinic acid or salt thereof (c) the following general formula (1) H ₂ N (CH ₂ ) _n COOH (1) (wherein n is 3 to 9) The present invention provides a cosmetic comprising one or more aminocarboxylic acids represented by (indicated by integer).

In the cosmetic of the present invention, the amount of urea (a) to be blended is preferably 0.1 to 5% by weight (hereinafter referred to simply as%), particularly preferably 0.5 to 2%.

The salt of succinic acid that can be used as the component (b) in the present invention includes, for example, sodium salt, potassium salt and ammonium salt of succinic acid. In the present invention, succinic acid and a salt of succinic acid may coexist.

In the cosmetic of the present invention, the succinic acid as the component (b) and the above-mentioned succinic acid salts may be used alone or in combination of two or more, and the blending amount thereof is (a). ) Component urea (b) / (a) by weight ratio
= 1/10 to 20/10 is preferable, and it is particularly preferable that the amount is approximately the same as the amount of urea as the component (a).

The aminocarboxylic acid as the component (c) used in the cosmetic composition of the present invention is represented by the above general formula (1). Specifically, 4-amino-n-butyric acid (n =
3), 6-amino-n-caproic acid [ε-aminocaproic acid] (n = 5), ω-aminocaprylic acid (n = 7) and the like. Especially, ε-aminocaproic acid is particularly preferable.

In the cosmetics of the present invention, these aminocarboxylic acids as the component (c) can be used alone or in combination of two or more, and the amount thereof is (a).
(C) / (a) = 1/10 by weight ratio to the component urea
To 5/10, especially (c) / (a) = 2/10
The amount is preferably about 4/10.

The cosmetic of the present invention can further improve the softening effect on the skin and stratum corneum and the stabilizing effect of urea by further adding an amino acid and / or a salt thereof as the component (d). Examples of the amino acid used here include lysine, histidine, arginine, ornithine, canavanine, glutamic acid, aspartic acid, serine, alanine, glycine, leucine, isoleucine, proline, threonine, valine, methionine, cystine, cysteine, and hydroxyproline. Examples of the amino acid include basic amino acids such as lysine, histidine, arginine, ornithine and canavanine. In addition, as salts of such basic amino acids,
Examples thereof include basic amino acid hydrochlorides, sulfates, nitrates and the like, and the hydrochloride is particularly preferable.

In the cosmetic of the present invention, the amino acids and salts thereof as the component (d) may be used alone or
Alternatively, two or more kinds may be used in combination, and the blending amount thereof is preferably 0.05 to 5%, and particularly preferably 0.1 to 3% with respect to the total amount of the cosmetic. If the blending amount is less than 0.05%, the stabilizing effect of urea is not sufficient, and if the blending amount exceeds 5%, stickiness occurs when applied to the skin, which is not preferable.

In the cosmetic of the present invention, it is preferable to adjust the pH within the range of 4.0 to 7.5, particularly 4.0 to 5.5 in view of the stability of urea. The pH adjuster used to adjust the pH, malic acid, lactic acid, citric acid,
Examples thereof include acids such as phosphoric acid and tartaric acid, and bases such as potassium salt, sodium salt and ammonium salt thereof.

The stabilizing effect of urea in the present invention can be obtained in either a solubilizing system or an emulsifying system.
Therefore, the cosmetic of the present invention can be made into various solubilizing or emulsifying dosage forms such as lotion, emulsion, cream, pack, foundation and the like.

If desired, the cosmetic composition of the present invention may contain various optional components commonly used in cosmetics, quasi-drugs, pharmaceuticals, etc. within a range that does not impair the effects of the present invention. Examples of such optional components include purified water, ethanol, oily components, moisturizers, thickeners, preservatives, surfactants, antioxidants, chelating agents, ultraviolet absorbers, powders,
Examples thereof include dyes, medicinal ingredients, and fragrances. Specifically, oily ingredients include liquid paraffin, petrolatum, paraffin wax, squalane, beeswax, carnauba wax, olive oil, lanolin, higher alcohols, fatty acids, synthetic esters of higher alcohols and fatty acids. Oils, silicone oils and the like can be mentioned. Moisturizing agents include sorbitol, xylitol,
Glycerin, maltitol, propylene glycol,
1,3-butylene glycol, 1,4-butylene glycol, sodium pyrrolidonecarboxylate, lactic acid, sodium lactate, polyoxypropylene fatty acid ester, polyethylene glycol and the like can be mentioned. As the thickener, carboxyvinyl polymer, carboxymethyl cellulose,
Examples include polyvinyl alcohol, water-soluble polymers such as carrageenan and gelatin, electrolytes such as sodium chloride and potassium chloride, and preservatives such as methylparaben, ethylparaben, propylparaben, butylparaben and sodium benzoate. As the activator, polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, glycerin fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitol Nonionic surfactants such as fatty acid esters can be mentioned, and powders include talc, sericite, mica, kaolin, silica, bentonite, vermiculite, zinc white. Mica, mica titanium, titanium oxide,
Magnesium oxide, zirconium oxide, barium sulfate,
Examples include red iron oxide, iron oxide, and ultramarine.

[0017]

EFFECTS OF THE INVENTION The cosmetic composition of the present invention has a high effect of suppressing the decomposition of urea contained in the cosmetic composition. Therefore, even if it is stored for a long period of time at a high temperature, its pH value slightly rises and no ammonia odor occurs. . In addition, it has no stickiness during application and has a good feel.

[0018]

The present invention will be further described with reference to examples, but the present invention is not limited thereto.

Example 1 A lotion having the composition shown in Table 1 was prepared by a conventional method, and the pH change with time when stored at 50 ° C. was measured. The results are shown in Table 2.

[0020]

[Table 1]

[0021]

[Table 2]

As is clear from the results shown in Table 2, the inventive product showed a slight increase in pH as compared with the comparative product. Further, the product of the present invention did not produce any ammonia odor.

Example 2 A lotion having the composition shown in Table 3 was prepared by a conventional method. When these were stored at 50 ° C. for 5 months, the pH hardly increased and no ammonia odor was generated.

[0024]

[Table 3]

Example 3 A W / O cream having the composition shown in Table 4 was prepared by a conventional method. When this was stored at 50 ° C. for 5 months, there was almost no increase in pH and no ammonia odor was generated.

[0026]

[Table 4]

Example 4 An O / W emulsion having the composition shown in Table 5 was prepared by a conventional method. When this was stored at 50 ° C. for 5 months, there was almost no increase in pH and no ammonia odor was generated.

[0028]

[Table 5]

Claims (2)

[Claims] 1. The following components (a), (b) and (c) (a) urea (b) succinic acid or a salt thereof (c) the following general formula (1) H ₂ N (CH ₂ ) _n COOH ( 1) A cosmetic containing one or more aminocarboxylic acids represented by the formula (wherein n represents an integer of 3 to 9). 2. The cosmetic according to claim 1, further comprising the following component (d) (d) amino acid and / or salt thereof.