JP3125477B2 - Cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cosmetics, and more particularly, to the ability to remove dirt and make-up cosmetics even when the skin is wet by using a solubilized composition comprising specific components as a base. The present invention relates to a cosmetic which has a (cleansing power), a good feel during use, and can be easily washed away with water after use.

[0002]

2. Description of the Related Art Conventionally, cleansing products for removing makeup include creamy products, emulsion types and lotion types, and more recently, oily or gel-like cleansing materials to be washed away and used. Used.

JP-A-59-46123 discloses that a gel emulsion composed of an oil in a surfactant is suitable for a cleansing agent, and has excellent emulsifying and dispersing properties in water and can be washed away with water alone. It became. However, since this emulsion is a composition in a two-phase region, it has problems in stickiness during use and storage stability after a long time.

Means for solving such a problem have been proposed in Japanese Patent Application Laid-Open Nos. Sho 62-53910 and Hei 1-102012. However, these materials have a problem that they are heavy and uncomfortable when used in a state containing water or under high humidity, and thus cannot be used in a bathroom.

A method for solving this problem is disclosed in Japanese Unexamined Patent Publication No.
No. 5212 and Japanese Patent Application Laid-Open No. 4-5213, these cleansing agents containing a polyhydric alcohol such as glycerin or sorbitol have a feeling of fever on the skin and have been recently used for the cool use. A cool type with a feeling could not be prepared.

[0006]

SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above-mentioned problems, and has an excellent water-washing property and improved cleansing power and feeling in use when the skin is wet. The purpose of the present invention is to obtain a cosmetic that can be washed and used.

[0007]

Means for Solving the Problems The present inventors have made intensive studies to solve the above problems, and as a result, have found that N-acyl acidic amino acids or salts thereof, branched fatty acids having 14 to 40 carbon atoms, oil components and water. It has been found that the solubilized state composition obtained from the above becomes a cosmetic base meeting the above-mentioned object, and the present invention has been completed.

[0008] That is, the present invention relates to a cosmetic composition for washing after use based on a solubilized 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.

[0009] 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. The acyl group is an acyl group derived from a saturated or unsaturated fatty acid having 8 to 22 carbon atoms. For example, in addition to an acyl group formed by a fatty acid having a single composition such as lauric acid, palmitic acid, stearic acid, and oleic acid, palm It may be an acyl group of a mixed fatty acid obtained from nature such as oil fatty acid, tallow fatty acid, and hardened tallow fatty acid, or a fatty acid obtained by synthesis. Glutamic acid, aspartic acid, cysteic acid and the like can be used as acidic amino acids. N-acyl acidic amino acids can also be used as salts of sodium, potassium, triethanolamine and the like. These may be used alone or in combination of two or more. N-
The acyl acidic amino acid is usually from 1 to 1 based on the total amount of the composition.
50% by weight (hereinafter simply indicated as%), preferably 2-3%
It is blended in the range of 0%. If it is less than 1%, no solubilized state is formed, and if it exceeds 50%, the composition solidifies, which is not preferable.

As the branched fatty acid having 14 to 40 carbon atoms used in the present invention, a liquid fatty acid at room temperature is suitable, for example, 2-propylundecanoic acid, 2-ethyltridecanoic acid, 2-propyldodecanoic acid, -Butylundecanoic acid, 2-pentyldecanoic acid 2-hexylnonanoic acid, 2-
Propyltridecanoic acid, 2-butyldodecanoic acid, 2-hexylundecanoic acid, 2-heptyldecanoic acid, 2-pentyltridecanoic acid, 2-hexyldodecanoic acid, 2-heptyldodecanoic acid, 2-heptylundecanoic acid, 2- Fatty acids such as octyldecanoic acid, 2-octylundecanoic acid, 2-decyltetradecanoic acid and 2-decylpentadecanoic acid are exemplified. These may be used alone or in combination of two or more. The amount of the branched fatty acid having 14 to 40 carbon atoms varies depending on the feel and cleansing power of the composition, but is usually 5 to 90%, preferably 10 to the total amount.
It is blended in the range of ５０50%. If it is less than 5%, the cleansing power is lacking, and if it exceeds 90%, the composition is solidified, which is not preferable.

The oil component used in the present invention may be a liquid oil commonly used in cosmetics, pharmaceuticals, etc., for example, hydrocarbons such as liquid paraffin, higher alcohols such as octyldodecanol, octyldodecyl myristate, Synthetic oils such as ethylhexanoic acid triglyceride, and animal and vegetable oils such as olive oil, jojoba oil, and squalane. These may be used alone or in combination of two or more. In addition, beeswax, solid oil such as paraffin,
It may be used in liquid form in combination with liquid oil. The oil component is usually blended in an amount of 1 to 75%, preferably 10 to 70%, based on the total amount of the composition. If it is less than 1%, no solubilized state is formed, and if it is more than 75%, it is not preferable because it lacks moisture resistance.

Although the amount of water affects the cleansing power and the state of the composition, it is usually added in the range of 1 to 75% based on the total amount of the composition.

[0013] The solubilized state composition used in the cosmetic of the present invention forms 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 manufactured by mixing with the following composition. The solubilized state composition referred to in the present invention refers to an oil continuous phase state in which the aqueous phase component is incorporated into the reverse micelles, a water-oil bicontinuous phase in which the aqueous phase component and the oil phase component are incorporated in the surfactant phase. A composition that is in a thermodynamically stable state, such as a state. Such a composition can be appropriately determined by preparing a phase diagram by a mixing test of each component usually performed by an expert in this field. In some cases, the formation of a solubilized state composition can be promoted by adding a salt or acid such as sodium chloride, potassium chloride, or 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 disclosed in the publication cannot be the solubilized composition described in the present invention, and the properties of the obtained composition are completely different.

Examples of the method for producing the solubilized composition which is the base of the cosmetic of the present invention include N-acyl acidic amino acid salts,
A branched fatty acid having 14 to 40 carbon atoms, an oil component, water, and the like, if necessary, salts and the like are added, mixed, dissolved by heating, and cooled to around room temperature with stirring.
In this case, since the composition is in a uniform one-phase region, the same composition is obtained irrespective of the mixing order of the components.

The cosmetic composition of the present invention is based on the solubilized composition, and is used as a medicinal agent, preservative, bactericide, amphoteric surfactant, wetting agent, ultraviolet absorber, or the like commonly used in cosmetics and pharmaceuticals. It can be obtained by mixing a tackifier, a dye, a fragrance and the like as needed at the time of preparing the composition or after preparing the composition.

The reason why the cosmetic of the present invention exhibits excellent cleansing power even when the skin is wet is that the oil component and water can be appropriately blended in a region where the solubilized state is not destroyed by a small amount of water. Conceivable. It is considered that the product of the present invention containing a branched fatty acid having 14 to 40 carbon atoms can easily disperse skin stains and makeup stains in cosmetics, and thus can obtain excellent cleansing power.

[0018]

The cosmetic of the present invention has good stretch on the skin,
The feeling of use and the cleansing power in the wet state of the skin are greatly improved. In addition, since the conventional gel cleansing agent used a polyhydric alcohol such as glycerin, it caused a hydration reaction with water on the skin and caused a feeling of heat, but the product of the present invention does not use a polyhydric alcohol. A cosmetic with a cool feel can be prepared.

[0019]

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

For the evaluation, the following evaluation method was used. 1. Solubilized state; observed visually. 2. Washability: Sensory test was conducted by a panel of 10 professionals. The evaluation was performed on a scale of 1 (poor) to 5 (good), and those having an average score of 4 or more were rated as ○, those with an average score of 3 or more but less than 4 were rated as Δ, and those with less than 3 were rated as x. 3. Cleansing power (dry skin); 10cm panel with lipstick (Kao Sofina 213) 2cm x 3
After applying to the forearm in an area of cm and leaving it to stand for 30 minutes, it is massaged with a 1 ml sample to remove dirt for 30 seconds and rinsed with water. The degree of dirt removal was visually evaluated on a scale of 1 (no removal at all) to 10 (completely removal) and averaged. 4. Feeling of use (dry skin): The feeling of use when used in a dry state was evaluated by sensory evaluation (equivalent to the evaluation of water washability). 5. Cleansing power (wet skin condition); 2cm x 3 lipsticks (Kao Sofina 213) on 10 specialized panels
After applying to the forearm in an area of about 30 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 to remove dirt for 30 seconds, and rinse with water. . The degree of dirt removal was visually evaluated on a scale of 1 (no removal at all) to 10 (completely removal) and averaged. 6. Feeling of use (wet skin condition): A feeling of use when used with hands wet was evaluated by sensory evaluation (equivalent to evaluation of water washability).

Preparation Example An aqueous component and an oil component are each heated and mixed at 80 ° C. to be uniform, and then both components are mixed. This was stirred and cooled to around room temperature to obtain a solubilized composition.

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

[0023]

[Table 1]

As can be seen from Table 1, the product of the present invention was excellent in use feeling and 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 excellent cleansing power even when the skin was wet. ○ Aqueous component ・ 30% aqueous solution of N-coconut fatty acid acyl-L-glutamic acid monotriethanolamine 60 (%) ○ Oilous component ・ Isostearic acid 14 ・ Octyldodecanol 6 ・ Menthol 0.2 ・ Ethanol 19.8

Continuation of the front page (56) References JP-A-6-116118 (JP, A) JP-A-5-255696 (JP, A) JP-A-5-17342 (JP, A) JP-A-2-175799 (JP) JP-A-1-146816 (JP, A) JP-A-3-285996 (JP, A) JP-A-60-214724 (JP, A) JP-A-4-5212 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) A61K 7/02 A61K 7/00

Claims (1)

(57) [Claims] 1. A cosmetic composition to be washed out and used based on a solubilized 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.