JPH06145024A - Cosmetic - Google Patents

Abstract

PURPOSE:To obtain a cosmetic, good in extensibility on the skin, remarkably improved in feeling of use and cleansing power in a wet state of the skin and having the cool touch due to no use of a polyhydric alcohol. CONSTITUTION:This cosmetic comprises a composition in a solubilized state obtained from an N-acyl acidic amino acid salt, a 14-40C branched fatty acid, oils and water as a base. This cosmetic is used by washing away.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cosmetics, and more specifically, it is capable of removing stains and makeup cosmetics even when the skin is wet by using a solubilized composition composed of specific components as a base. (Cleansing power), good feeling in use, and a cosmetic that can be easily washed off with water after use.

[0002]

2. Description of the Related Art Conventionally, as a cleansing product for removing makeup, there are cream-type products, emulsion-type products, lotion-type products, etc., and recently, oil-like or gel-like cleansing products for washing off and using. It is used.

Japanese Unexamined Patent Publication No. 59-46123 discloses that a gel emulsion composed of an oil in a surfactant is suitable as a cleansing agent, and has excellent emulsification and dispersibility in water and can be washed off only with water. Became. However, since this emulsion is a composition in a two-phase region, it has problems in stickiness during use and storage stability after aging.

Means for solving such problems have been proposed in JP-A-62-53910, JP-A-1-102012 and the like. However, these materials have a problem that they are heavy and have a bad feeling when used in a water-containing state or under high humidity, and thus they cannot be used in a bathroom.

A method for solving this problem is disclosed in Japanese Unexamined Patent Publication No.
Although disclosed in JP-A No. 5212 and JP-A No. 4-5213, these cleansing agents containing polyhydric alcohols such as glycerin and sorbitol have a feeling of fever on the skin and are recently favored for cool use. A cool type with a feeling could not be prepared.

[0006]

SUMMARY OF THE INVENTION The object of the present invention was made in view of the above problems and has an excellent water washability and improved cleansing power and usability when the skin is wet. It is intended to obtain a cosmetic for washing off and using.

[0007]

As a result of intensive studies to solve the above problems, the present inventor has found that N-acyl acidic amino acids or salts thereof, branched fatty acids having 14 to 40 carbon atoms, oil components and water. It was found that the solubilized composition obtained from the above can serve as a cosmetic base that meets the above-mentioned object, and has completed the present invention.

[0008] That is, the present invention is a cosmetic for rinsing and use based on a solubilized state composition obtained from an N-acyl acidic amino acid or a salt thereof, a branched fatty acid having 14 to 40 carbon atoms, an oil component and water. It is about fees.

The N-acyl acidic amino acid used in the present invention can be obtained by a known method, for example, by reacting a fatty acid chloride with an acidic amino acid. As the acyl group, an acyl group derived from a saturated or unsaturated fatty acid having 8 to 22 carbon atoms, for example, an lauric acid, palmitic acid, stearic acid, oleic acid, or other fatty acid having a single composition, palm, It may be an acyl group of a naturally occurring mixed fatty acid such as oil fatty acid, tallow fatty acid, hardened tallow fatty acid or the like, or a fatty acid obtained by synthesis. Glutamic acid, aspartic acid, cysteic acid and the like can be used as the acidic amino acid. The N-acyl acidic amino acid can also be used as a salt of sodium, potassium, triethanolamine or the like. You may use these individually or in combination of 2 or more types. N-
The acyl acidic amino acid is usually 1 to the total amount of the composition.
50% by weight (hereinafter referred to simply as%), preferably 2-3
It is compounded in the range of 0%. If it is less than 1%, a solubilized state is not formed, and if it exceeds 50%, the composition is solidified, which is not preferable.

Suitable branched fatty acids having 14 to 40 carbon atoms used in the present invention are liquid ones at room temperature, such as 2-propylundecanoic acid, 2-ethyltridecanoic acid, 2-propyldodecanoic acid, 2 -Butylundecanoic acid, 2-pentyldecanoic acid 2-hexylnonanoic acid, 2-
Propyltridecanoic acid, 2-butyldodecanoic acid, 2-hexylundecanoic acid, 2-heptyldecanoic acid, 2-pentyltridecanoic acid, 2-hexyldecdecanoic acid, 2-heptyldodecanoic acid, 2-heptylundecanoic acid, 2- Fatty acids such as octyldecanoic acid, 2-octylundecanoic acid, 2-decyltetradecanoic acid, and 2-decylpentadecanoic acid can be mentioned. You may use these individually or in combination of 2 or more types. The amount of the branched fatty acid having 14 to 40 carbon atoms to be added varies depending on the feel and cleansing power of the composition, but is usually 5 to 90%, preferably 10% based on the total amount.
It is blended in the range of 50%. When it is less than 5%, the cleansing power is insufficient, and when it exceeds 90%, the composition is solidified, which is not preferable.

The oil component used in the present invention may be a liquid oil usually used in cosmetics, pharmaceuticals and the like. For example, hydrocarbons such as liquid paraffin, higher alcohols such as octyldodecanol, octyldodecyl myristate, 2- Examples thereof include synthetic oils such as ethylhexanoic acid triglyceride, and animal and vegetable oils such as olive oil, jojoba oil, and squalane. You may use these individually or in combination of 2 or more types. In addition, solid oil such as beeswax, paraffin,
It may be used in liquid form in combination with liquid oil. The oil component is usually added in an amount of 1 to 75%, preferably 10 to 70% based on the total amount of the composition. When it is less than 1%, a solubilized state is not formed, and when it exceeds 75%, moisture resistance is insufficient, which is not preferable.

The blending amount of water influences the cleansing power and the state of the composition, but is usually blended in the range of 1 to 75% with respect to the total amount of the composition.

The solubilized state composition used in the cosmetic of the present invention forms a solubilized state composition obtained from N-acyl acidic amino acid or a salt thereof, a branched fatty acid having 14 to 40 carbon atoms, an oil component and water. It is manufactured by mixing with the compounding composition. The solubilized state composition referred to in the present invention means an oil continuous phase state in which an aqueous phase component is incorporated into the reverse micelle, and a water-oil bicontinuous phase in which an aqueous phase component and an oil phase component are incorporated into a surfactant phase. The composition is in a thermodynamically stable state like a state. Such a compounding composition can be appropriately determined by preparing a phase diagram by a compounding test of each component that is usually performed by a person skilled in the art. In some cases, the formation of a solubilized state composition can be promoted by adding salts or acids such as sodium chloride, potassium chloride and hydrochloric acid.

On the other hand, Japanese Patent Publication No. 63-37093 also discloses a hair cosmetic composition containing an N-acyl acidic amino acid and a branched fatty acid, and the composition seems to be the same as that of the present invention. The hair cosmetic composition described in the publication cannot be the solubilized composition referred to in the present invention, and the properties of the resulting composition are completely different.

Illustrating the production method of the solubilized composition which is the base of the cosmetic of the present invention, an N-acyl acidic amino acid salt,
It can be obtained by adding a branched fatty acid having 14 to 40 carbon atoms, an oil component, water and, if necessary, a salt and the like, heating and dissolving the mixture, and cooling this to room temperature while stirring.
In this case, since the composition has a uniform one-phase region, the same composition can be obtained regardless of the mixing order of the components.

The cosmetic of the present invention is based on the solubilized composition, and is a medicinal agent, an antiseptic, a bactericide, an amphoteric surfactant, a wetting agent, an ultraviolet absorbent, and It can be obtained by blending a sticky agent, a dye, a fragrance, etc., as needed, at the time of preparing the composition or after preparing the composition.

The reason why the cosmetic composition of the present invention exhibits an excellent cleansing power even when the skin is wet is that the oil component and water can be appropriately mixed in a region where the solubilized state is not broken by a small amount of water. Conceivable. The product of the present invention containing a branched fatty acid having 14 to 40 carbon atoms is considered to be able to obtain excellent cleansing power because it easily disperses skin stains and makeup stains in cosmetics.

[0018]

EFFECTS OF THE INVENTION The cosmetic of the present invention has good elongation on the skin,
The feeling of use when the skin was wet and the cleansing power were significantly improved. Further, since the conventional gel-like cleansing agent used polyhydric alcohol such as glycerin, there was a feeling of exotherm due to hydration reaction with water on the skin, but the product of the present invention does not use polyhydric alcohol, Cosmetics with a cool feel can be prepared.

[0019]

The present invention will be described in more detail with reference to the following examples.

For evaluation, the following evaluation methods were used. 1. Solubilized state: visually observed. 2. Washability: Sensory test was conducted by a panel of 10 people. The evaluation was carried out in 5 grades from 1 (bad) to 5 (good), and those with an average score of 4 or more were evaluated as ◯, those with an average score of 3 or more and less than 4 were evaluated as Δ, and those with an average score less than 3 were evaluated as x. 3. Cleansing power (dry skin); Lipstick (Kao Sofina 213) 2 cm x 3 on a panel of 10 people
After applying it to the forearm in an area of cm and leaving it for 30 minutes, 1 ml of the sample is massaged for 30 seconds so as to remove dirt, and rinsed with water. The degree of stain removal was visually expressed in 10 levels from 1 (no removal at all) to 10 (complete removal) and averaged. 4. Feeling of use (dry state of skin): The feeling of use when used in a dry state was evaluated by sensory evaluation (similar to the evaluation of washability). 5. Cleansing power (wet skin); lipstick (Kao Sofina 213) 2cm x 3 on 10 expert panel
After applying it to the forearm in an area of cm and leaving it for 30 minutes, wet the arm with water (about 0.05 ml of water droplets on the dirt), massage with 1 ml of the sample for 30 seconds to remove the dirt, and rinse with water. . The degree of stain removal was visually expressed in 10 levels from 1 (no removal at all) to 10 (complete removal) and averaged. 6. Feeling of use (wet state of skin); The feeling of use when the hand was wet was sensory-evaluated (according to the evaluation of washability).

Preparation Example The aqueous component and the oil component are heated and dissolved and mixed at 80 ° C. to homogenize them, and then both components are mixed. This was stirred and cooled to near room temperature to obtain a solubilized composition.

Example 1 The formulations shown in Table 1 below were prepared according to the preparation examples, and the appearance, feeling of use, cleansing power and water washability were evaluated. The results are shown in Table 1. As a comparative product, a composition using polyhydric alcohol and a composition containing no N-acyl acidic amino acid were evaluated in the same manner.

[0023]

[Table 1]

As can be seen from Table 1, the product of the present invention was excellent in the feeling of use and the cleansing power when the skin was wet.

Example 2 A cool type cleansing gel was prepared according to the preparation example based on the following formulation. It had a good feeling of use and was excellent in cleansing power even when the skin was wet. ○ Aqueous component ・ N-coconut oil fatty acid acyl-L-glutamic acid monotriethanolamine 30% aqueous solution 60 (%) ○ Oil component ・ Isostearic acid 14 ・ Octyldodecanol 6 ・ Menthol 0.2 ・ Ethanol 19.8

Claims (1)

[Claims] 1. A cosmetic for rinsing and use, which is based on a solubilized state composition obtained from an N-acyl acidic amino acid or a salt thereof, a branched fatty acid having 14 to 40 carbon atoms, an oil component and water.