JPH0913093A - Skin-care soap - Google Patents

Abstract

PURPOSE: To obtain a skin-care soap provided with film-forming properties and moisture retentivity to prevent the moisture content of a horny substance from decreasing even when sebum decreases, by blending a soap with a humectant obtained by allowing hydrolyzable collagen to interact with chitosan modified with a carboxylic acid. CONSTITUTION: This soap contains a humectant capable of covering and smoothing the skin by adsorption and obtained by allowing hydrolyzable collagen to interact with chitosan modified with a carboxylic acid. For example, ascorbic, citric, lactic, malic or adipic acid can be used as the carboxylic acid for modifying chitosan.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soap for skin care containing a moisturizing agent having an adsorptive coating property.

[0002]

2. Description of the Related Art Toilet soap is produced by saponifying fats and oils or fatty acids with an alkali. Fats and oils include beef tallow, coconut oil, palm oil, soybean oil, cottonseed oil, peanut oil, castor oil and the like, and fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid. , Ricinoleic acid, etc. are used. As the saponifying agent, caustic soda and caustic potash are used, and soda carbonate, sodium silicate, triethanolamine and the like are used to enhance fatty acid neutralization and detergency.

When soap is dissolved in water, p
It is said to be unfavorable to people with weak skin because it exhibits alkalinity exceeding H9. As a soap that does not show alkalinity, there is also a method of obtaining an acidic soap by reacting a fatty acid generated by hydrolysis of soap with soap, but since acidic soap is poorly soluble in water, it becomes a suspension and soap properties are difficult to practically use. Is.

[0004]

Toilet soap can cleanse the skin by removing dirt, but at the same time, it also removes sebum on the skin surface. The sebum on the skin surface plays an important role in maintaining the water content of the keratin, and the decrease in sebum leads to a decrease in the keratin water content, which is a serious drawback especially for people with weak skin. To keep your skin healthy 2
It is necessary to contain about 0% of water, and when the water content of the keratin decreases, the flexibility is lost and the skin becomes rough. If the sebum decreases due to the use of soap, it will interfere with the maintenance of the water content of the keratin, leading to rough skin and hypersensitivity of atopic or allergic diseases.

As a measure against this, castor oil, rosin, glycerin, sugar and the like are mixed in soap, but since they are emulsified and removed by soap, they are not retained on the skin and a sufficient skin protection effect is not obtained. It was difficult.

From the viewpoint of skin care, acidic soaps which do not show alkalinity are preferable, but they cannot be used as toilet soaps because they are sparingly soluble and suspended so that the cleaning effect cannot be exhibited.

[0007] There is a strong demand for a skin care soap that can be used for atopic diseases and allergic diseases without causing rough skin even for people with weak skin. In response to this problem, the present invention provides a skin care soap in which a soap has a film-forming moisturizing function so as to prevent rough skin from being deteriorated even when the amount of sebum is reduced to prevent rough skin.

It is also possible to provide an acidic soap having a moisturizing function as a skin care soap for rough skin, atopic diseases and allergic diseases.

As a conventionally known moisturizer and care agent using chitosan, a method for care and cleaning of hair and an agent therefor (Japanese Patent Publication No. 58-58).
31324), which contains a chitosan salt of formic acid, acetic acid or lactic acid. However, although it can be used for hair, it is not suitable as a skin care soap because it is unsatisfactory in its adsorptivity to skin, moisture retention and smooth coverage.

As a chitosan-based cosmetic having excellent moisturizing properties, a cosmetic containing carboxymethyl chitosan (CPCM chitosan) and collagen (Japanese Patent Laid-Open No. 6-27).
9231) is known. This has excellent moisturizing power due to the synergistic effect of CPCM chitosan and collagen,
Since it has a high hygroscopicity, it is sticky and has a problem in touch, and because the film-forming coating is weak, the effect of protecting keratin water is not sufficient when the skin is exposed to harsh conditions.

[0011]

The present invention relates to a skin care soap characterized in that chitosan modified with carboxylic acid contains a smooth moisturizer which is adsorbable and coated on the skin on which hydrolyzed collagen is made to act. is there.

Further, in the present invention, the carboxylic acid for modifying chitosan is ascorbic acid, citric acid,
It includes a skin care soap which is at least one component selected from lactic acid, malic acid and adipic acid.

The moisturizing agent of the present invention is mixed with chitosan in carboxylic acid and, if necessary, water is added to the humectant at 4 to 8 at 20 to 50 ° C.
It is obtained by stirring for a time, then adding hydrolyzed collagen and stirring. When this moisturizing agent is blended with soap, a skin care soap having a skin care effect at the same time as washing the skin can be obtained. As the soap, alkaline soap or acidic soap can be used.

[0014]

INDUSTRIAL APPLICABILITY According to the present invention, by coating hydrolyzed collagen on chitosan obtained by modifying chitosan into a water-soluble chitosan salt with a carboxylic acid, a smooth and film-forming coating having adsorptivity to the skin is obtained. This coating has a high moisturizing property, and due to its moisturizing power and coating effect, it has an effect of maintaining keratin water even under severe conditions. This moisturizer has adsorptivity to the skin, so even if blended with soap,
It is not removed during use, and since it covers the skin, it is effective even after washing. Further, in the carboxylate of chitosan, a part of the carboxyl groups neutralizes the alkalinity when the soap is dissolved, so that the pH can be maintained at 8 to 6, and the skin can be protected from alkali.

The feel of this soap after use is such that the skin surface is refreshing and has excellent smoothness, and the tackiness caused by conventional moisturizers can be eliminated. It can solve dry skin roughness and is also effective for atopic and allergic diseases.

This humectant can be effectively added to conventional alkaline soaps, but when added to acidic soaps, the action of modified chitosan and hydrolyzed collagen allows the acidic soaps to be used without being suspended.

[0017]

Example 1 500 g of powdered chitosan, 500 lactic acid
g and 400 g of water were mixed and stirred at 40 ° C. for 5 hours, then 600 g of hydrolyzed collagen was added and stirred at 30 ° C. for 3 hours to obtain a moisturizing agent. Add this moisturizer to coconut oil soap 8
%, And kneaded and stamped to obtain soap.

The pH of the solution of this soap in practical use was 8. After washing the skin with this soap and thoroughly washing the soap with hot water, a coating with excellent smoothness was obtained. As a result of daily use of this soap, rough skin was cured after 1 week.

[0019]

Example 2 500 g of powdered chitosan, 40 malic acid
0 g and 400 g of water were mixed and stirred at 45 ° C for 6 hours, then 400 g of hydrolyzed collagen was added and the mixture was added at 30 ° C for 2 hours.
The mixture was stirred for a time to obtain a moisturizer. Add this moisturizer to acidic soap 1
0% was blended and kneaded to obtain soap.

The pH of the solution of this soap in practical use was 6. As a result of daily use of this soap for atopic disease, the atopic disease was cured after 2 weeks.

Claims (2)

[Claims] 1. A skin care soap comprising a chitosan modified with a carboxylic acid, and a smooth moisturizing agent capable of adsorbing and covering skin to which hydrolyzed collagen is applied. 2. The skin care soap according to claim 1, wherein the carboxylic acid for modifying chitosan is at least one component selected from ascorbic acid, citric acid, lactic acid, malic acid and adipic acid.