JP5426210B2 - Cleansing cosmetics - Google Patents

Description

The present invention relates to a cleansing cosmetic containing a specific acrylic water-soluble polymer, a liquid oil at 25 ° C., L-theanine, and water, and more specifically, has a cleansing effect and is well washed away with water, The present invention relates to a cleansing cosmetic material that has a moisturizing effect on washed skin and is excellent in stability over time.

Conventional cleansing cosmetics used to remove sebum stains and makeup cosmetics on the skin are roughly classified into oily type, emulsified type and aqueous type. For example, as an oil-based cleansing cosmetic, a surfactant is added to a liquid oil that exhibits a cleansing effect mainly by being compatible with makeup and oil stains, in order to improve the rinse with water, and after washing There is a technique (see Patent Documents 1 and 2) in which a polyhydric alcohol is blended to impart a moisturizing effect to the skin. In addition, as emulsification type cleansing, liquid oil is emulsified with a surfactant, and a water-soluble polymer such as carboxyvinyl polymer or carboxymethylcellulose is added to form a cream or emulsion (Patent Documents 3 and 4). As a water-based cleansing that specializes in the fresh feeling of use and the freshness of the skin after washing, a surfactant is added to a large amount of polyhydric alcohol, and the gel is formed with a water-soluble polymer such as polyalkyl acrylate. Technology (Patent Documents 5 and 6). On the other hand, as a technique for imparting an excellent moisturizing effect to the skin, there are a technique for blending a large amount of glycerin and polyhydric alcohol and a technique characterized by blending L-theanine, which is a kind of amino acid (Patent Document 7). 8).
JP 2007-230899 A JP-A-4-308518 JP 2005-145874 A Japanese Patent No. 4185441 JP 2002-284672 A JP-A-9-87139 JP-A-7-149621 Japanese Patent No. 3543478

However, the oil-based cleansing cosmetics according to the techniques of Patent Documents 1 and 2 contain a large amount of oily components, so that they are well-suited to oil stains and have an excellent cleansing effect. On the other hand, after wiping off or washing off, Residue on the skin caused a sticky feeling, and the skin moisturizing effect after washing was insufficient. In addition, the emulsification type and aqueous cleansing cosmetics according to the techniques of Patent Documents 3 to 6 need to contain a large amount of surfactant in order to enhance the cleansing effect. Since the sebum was excessively emulsified and removed, there was a problem that the skin after washing was stagnated and the moisture retention function of the skin was lowered. Usually, in order to enhance the skin moisturizing effect, there are techniques for blending moisturizing ingredients into the preparations of the techniques of Patent Documents 7 and 8, but these are effective for skin care preparations such as lotions, emulsions and creams. Although exerted, a sufficient effect could not be obtained with respect to a cosmetic with a washing-off action such as a cleansing cosmetic.

In view of the above situation, as a result of intensive studies, the present inventors have included a specific acrylic water-soluble polymer, a liquid oil at 25 ° C., and L-theanine, thereby having a cleansing effect and being washed away with water. It has been found that cleansing cosmetics that are good and have a moisturizing effect on the skin after washing and that are excellent in stability over time can be obtained, and the present invention has been completed.

That is, the present invention includes the following components (a) to (d):
Component (a): A copolymer comprising acrylic acid or methacrylic acid, acrylic acid alkyl ester or methacrylic acid alkyl ester, and a compound having two or more ethylenically unsaturated groups, and an electrolyte. Cleansing cosmetic characterized by containing a water-soluble polymer component (b) which exhibits a thickening viscosity when contained, an oil agent component (c) which is liquid at 25 ° C .: an L-theanine component (d): water Is to provide.

Moreover, content of a component (a) is 2.5-15.0 mass%, The said cleansing cosmetics characterized by the above-mentioned are provided.

Furthermore, the cleansing cosmetic is characterized in that the mass ratio (a) :( b) of the component (a) to the component (b) is 1: 2 to 1: 7.

Furthermore, the component (b) is a monoester of a branched fatty acid having 6 to 10 carbon atoms and an alcohol having 5 to 18 carbon atoms and is one or more ester oils that are liquid at 25 ° C. The cleansing cosmetic is characterized by the above.

Furthermore, the present invention provides the cleansing cosmetic characterized by substantially not containing a surfactant.

Furthermore, component (a) is (meth) acrylic acid 95.42-97.48 mass%, carbon number of the alkyl group is 18-24, (meth) acrylic acid alkyl ester 2.43-4.30 mass%. And a cleansing cosmetic characterized in that it is a (meth) acrylic acid / (meth) acrylic acid alkyl ester copolymer which is 0.08 to 0.29% by mass of a compound having two or more ethylenically unsaturated groups. Is to provide.

  The cleansing cosmetic according to the present invention has a cleansing effect by emulsifying a liquid oil agent at 25 ° C. using a specific acrylic water-soluble polymer, and further contains L-theanine, and is washed away with water. Is good, has a moisturizing effect on the washed skin, and is excellent in stability over time.

Hereinafter, each component will be described in detail.
The component (a) specific acrylic water-soluble polymer that can be used in the cleansing cosmetic according to the present invention is contained for the purpose of emulsifying a liquid oil agent at 25 ° C. (b). The cleansing cosmetic composition can be spread smoothly on the skin by the oil agent emulsified using the water-soluble polymer, can be well blended with makeup and oil stains, and can provide a sufficient cleansing effect.

  Component (a) in the present invention is a copolymer in which acrylic acid or methacrylic acid, acrylic acid alkyl ester or methacrylic acid alkyl ester, and a compound having two or more ethylenically unsaturated groups are bonded. Thus, it is a water-soluble polymer that exhibits thickening when it contains an electrolyte.

  The component ratio in component (a) of acrylic acid or methacrylic acid (hereinafter referred to as “(meth) acrylic acid”), which is one of the components of component (a), is particularly limited as long as the characteristics are not impaired. It can be set freely. In the present invention, it is particularly preferably 95.42% by mass (hereinafter simply referred to as “%”) or more and 97.48% or less, more preferably 95.47% or more and 97.46% or less, and 95.97% or more and 96 or less. More preferably, it is 94% or less.

  The kind of the alkyl acrylate or methacrylic acid alkyl ester (hereinafter referred to as “(meth) acrylic acid alkyl ester”), which is one of the components of the component (a), must impair the characteristics of the component (a). Although not particularly limited, in the present invention, the alkyl group preferably has 18 to 24 carbon atoms. The (meth) acrylic acid alkyl ester having 18 to 24 carbon atoms in the alkyl group refers to an ester of (meth) acrylic acid and a higher alcohol having 18 to 24 carbon atoms in the alkyl group. Examples include esters of (meth) acrylic acid and stearyl alcohol, esters of (meth) acrylic acid and eicosanol, esters of (meth) acrylic acid and behenyl alcohol, and esters of (meth) acrylic acid and tetracosanol. it can. These may be used alone or in combination of two or more.

  Among these, particularly in the present invention, considering the viscosity characteristics and texture of the neutralized viscous aqueous solution described later containing the component (a) and the neutralized viscous aqueous solution in the presence of an electrolyte, stearyl methacrylate, eicosanyl methacrylate are considered. , Behenyl methacrylate and tetracosanyl methacrylate are preferred, and (meth) acrylic acid alkyl esters containing at least 50% behenyl methacrylate are more preferred. In addition, as a (meth) acrylic-acid alkylester whose carbon number of an alkyl group is 18-24, you may use commercial items, such as brand name Blemmer VMA70 by Nippon Oil & Fats Corporation, for example.

  The composition ratio in the component (a) of the (meth) acrylic acid alkyl ester is not particularly limited as long as the characteristics are not impaired, and can be freely set. In the present invention, it is particularly preferably 2.43% to 4.3%, more preferably 2.91% to 3.84%.

  As a more detailed composition ratio in the component (a) of the (meth) acrylic acid alkyl ester, a (meth) acrylic acid alkyl ester in which the alkyl group has 18 to 24 carbon atoms is 2.43% to 4.3%. It is preferable to contain. More specifically, for example, one (meth) acrylic acid alkyl ester having 18 to 24 carbon atoms in the alkyl group may be contained in an amount of 2.43% to 4.3%. A mixture of two or more (meth) acrylic acid alkyl esters having a number of 18 or more and 24 or less may be contained in an amount of 2.43% or more and 4.3% or less.

  The type of the compound having two or more ethylenically unsaturated groups, which is one of the constituent components of component (a), is not particularly limited as long as the properties of component (a) are not impaired, but in the present invention, for example, ethylene A compound in which the unsaturated group is an allyl group can be preferably used. Specifically, pentaerythritol allyl ethers such as pentaerythritol diallyl ether, pentaerythritol triallyl ether, and pentaerythritol tetraallyl ether, diethylene glycol diallyl ether, polyethylene glycol diallyl ether, and polyallyl saccharose are particularly preferable. In addition, these compounds having two or more ethylenically unsaturated groups may be used alone or in combination of two or more.

  The component ratio in the component (a) of the compound having two or more ethylenically unsaturated groups is not particularly limited as long as the characteristics are not impaired, and can be freely set. In the present invention, 0.08% to 0.29% is particularly preferable, 0.11% to 0.24% is more preferable, and 0.15% to 0.19% is further preferable. When the composition ratio in the component (a) of the compound having two or more ethylenically unsaturated groups is less than 0.08%, sufficient viscosity cannot be obtained in the preparation, which may cause waste liquid over time. is there.

  The component (a) contained in the cleansing cosmetic according to the present invention includes the above-described acrylic acid or methacrylic acid, an acrylic acid alkyl ester or a methacrylic acid alkyl ester, and a compound having two or more ethylenically unsaturated groups. And a copolymer in which at least are bonded. The polymerization method is not particularly limited, and can be freely selected from any known methods. For example, a usual method such as a method in which these components are stirred in a solvent in an inert gas atmosphere and polymerized using a polymerization initiator can be used.

  Although the inert gas for obtaining the inert gas atmosphere used for superposition | polymerization is not specifically limited, For example, nitrogen gas, argon gas, etc. can be mentioned.

  Although the solvent used for the polymerization is not particularly limited, it dissolves (meth) acrylic acid, (meth) acrylic acid alkyl ester, and a compound having two or more ethylenically unsaturated groups, but does not dissolve the resulting water-soluble polymer. There is no particular limitation as long as it does not inhibit the polymerization reaction. Specific examples of the solvent include hydrocarbon solvents such as n-pentane, n-hexane, n-heptane, cyclopentane, and cyclohexane. These may be used alone or in combination of two or more. Among these, n-hexane and n-heptane can be preferably used. These hydrocarbon solvents can also be used in combination with organic solvents such as ketones, esters, ethers, and saturated alcohols. Specific examples of preferred organic solvents include methyl acetate, ethyl acetate, isopropyl acetate, propyl acetate, butyl acetate, methyl ethyl ketone, butyl propionate, cyclohexanone and the like.

  The amount of the solvent used for the polymerization is preferably 300 to 5000 parts by mass with respect to 100 parts by mass of (meth) acrylic acid from the viewpoint of improving the stirring operability and the economical aspect.

  Although the polymerization initiator used for polymerization is not particularly limited, for example, a radical polymerization initiator can be preferably used. Specific examples include α, α'-azoisobutyronitrile, 2,2'-azobis-2,4-dimethylvaleronitrile, 2,2'-azobismethylisobutyrate, and the like. Among these, in order to obtain a high molecular weight water-soluble polymer (a), it is preferable to use 2,2'-azobismethylisobutyrate.

  The amount of the polymerization initiator used for the polymerization is preferably 0.00003 to 0.002 mol with respect to 1 mol of (meth) acrylic acid. When the amount of the polymerization initiator used is less than 0.00003 mol, the reaction rate becomes slow, which may not be economical. On the other hand, when the amount of the polymerization initiator used exceeds 0.002 mol, the polymerization proceeds rapidly, and it may be difficult to control the reaction.

  The reaction temperature in the polymerization is not particularly limited as long as the target component (a) can be obtained, but it is preferably 50 ° C. or higher and 90 ° C. or lower, more preferably 55 ° C. or higher and 75 ° C. or lower. When the reaction temperature is less than 50 ° C., the viscosity of the reaction solution increases and it may be difficult to stir uniformly. Conversely, when the reaction temperature exceeds 90 ° C., the reaction proceeds rapidly, and it may be difficult to control the reaction. The reaction time can be appropriately set depending on the reaction temperature, but it is usually preferably 0.5 to 5 hours.

  After completion of the reaction, the component (a) contained in the cleansing cosmetic according to the present invention can be obtained by heating the reaction solution at, for example, 80 ° C. or more and 130 ° C. or less to volatilize and remove the solvent. This is because if the heating temperature is less than 80 ° C., drying may take a long time, and if it exceeds 130 ° C., the solubility of the obtained component (a) in water may be impaired.

  The component (a) used in the present invention increases viscosity by adding an electrolyte to a gel composition swollen in water. For example, a neutralized viscous aqueous solution containing 1% of Carbopol 1342 (manufactured by LUBRIZOL ADVANCED MATERIALS), which is a polyalkyl acrylate copolymer similar to component (a), is reduced in viscosity by adding 1% of sodium chloride. Cause, component (a) shows an increase in viscosity. This is because the former causes aggregation and shrinkage of the polymer due to the addition of sodium chloride, and the viscosity of the entire system decreases, whereas the component (a) has an alkyl group introduced into the polymer in the aqueous solution. It is presumed that the thickening is increased to form a coalescence.

In addition, the component (a) used in the present invention has a characteristic of increasing the viscosity by coexisting with the electrolyte, but further has a characteristic that the change in the viscosity value with respect to the temperature change is small. Specifically, when the viscosity at 50 ° C. of the neutralized viscous aqueous solution containing 1% of component (a) and 1% of sodium chloride is used in cleansing cosmetics, the temperature changes. From the viewpoint of being less susceptible to the influence of the above, it is preferably 0.8 or more and 1.2 or less, and more preferably 0.9 or more and 1.1 or less.

In addition, the component (a) used in the present invention has a characteristic that the change in viscosity value with respect to the change in electrolyte concentration is small. Specifically, neutralization containing 1% of component (a) and 0.5% of sodium chloride with respect to viscosity 1 at 25 ° C. of a neutralized viscous aqueous solution containing 1% of component (a) and 1% of sodium chloride The viscosity at 25 ° C. of the viscous aqueous solution is preferably 0.7 or more and 1.2 or less from the viewpoint that it can be easily used for various compounding formulations having different electrolyte concentrations when used in cleansing cosmetics. More preferably, it is 9 or more and 1.0 or less.

The electrolyte here is a substance that makes the solution electrically conductive when dissolved in water or other solvent, and can be used regardless of organic or inorganic if it is usually used as a cosmetic. it can. Specific examples include organic compounds such as amino acids, lactic acid, citric acid and pyrrolidone carboxylic acid, metal salts such as potassium, sodium, magnesium and calcium, and inorganic salts such as sodium chloride and magnesium chloride. The whitening electrolytes include ascorbic acid phosphates, ascorbic acid alkyl esters, ascorbic acid sulfates, ascorbic acid glucosides, and ascorbic acids such as metal salts such as sodium, potassium, magnesium, and calcium. Can be mentioned. Furthermore, naturally derived aqueous solutions containing these electrolytes, such as deep ocean water and hot spring water, are also included.

  The content of the component (a) specific acrylic water-soluble polymer in the cleansing cosmetic is not particularly limited as long as the object of the present invention is not impaired, and is appropriately adjusted depending on the purpose and the blending of other components. However, it is preferably 2.5% or more and 15.0% or less, and more preferably 5.0% or more and 10.0% or less.

  The component (b) oil agent that is liquid at 25 ° C. used in the present invention is contained for the purpose of exhibiting the effect of removing them from the skin by being compatible with cosmetics and oil stains.

Component (b) includes hydrocarbons, fats and oils, ester oils, fatty acids, higher alcohols, silicone oils, regardless of the origin of animal oils, vegetable oils, minerals, synthetic oils and the like commonly used in cosmetics. Fluorine oils, lanolin derivatives, oil-soluble ultraviolet absorbers and the like can be mentioned. Specifically, hydrocarbons such as liquid paraffin, squalane, α-olefin oligomer, oils and fats such as olive oil, castor oil, mink oil, macadamian nut oil, jojoba oil, cetyl isooctanoate, isopropyl myristate, palmitic acid Isopropyl, octyldodecyl myristate, glyceryl trioctanoate, polyglyceryl diisostearate, diglyceryl triisostearate, dialkyl carbonate, dipentanoic acid neopentyl glycol, and other esters, isostearic acid, oleic acid and other fatty acids, oleyl alcohol, isostearyl Higher alcohols such as alcohol, fluorinated oils such as perfluoropolyether, perfluorodecane and perfluorooctane, and oil-soluble purple such as 2-ethylhexyl p-methoxycinnamate Silicone oils such as linear absorbers, low polymerization dimethylpolysiloxane, high polymerization dimethylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, polyether-modified polysiloxane, fluorine-modified silicone Etc.

Among these, ester oils that are monoesters of branched fatty acids having 6 to 10 carbon atoms and alcohols having 5 to 18 carbon atoms and are liquid at 25 ° C., specifically cetyl isooctanoate, isononyl isononanoate And isotridecyl isononanoate are excellent in terms of cleansing effect and stability over time, and one or more of them can be used as necessary.

In addition, the liquid in this invention refers to the viscosity value of 1-3000 mPa * s or less at 25 degreeC, and is a property which has sufficient fluidity | liquidity. Viscosity measurement here can be measured using a B-type rotational viscometer (Toshiba System Co., Ltd., Bismetron viscometer VDA2).

  The content of the component (b), a liquid oil at 25 ° C., in the cleansing cosmetic is not particularly limited as long as the object of the present invention is not impaired, and can be appropriately adjusted according to the purpose and the blending of other components. However, it is preferably 10.0% or more and 60.0% or less, and more preferably 20.0% or more and 50.0% or less.

The blending ratio of component (a) and component (b) in the present invention is not particularly limited as long as the object of the present invention is not impaired, and can be appropriately adjusted depending on the purpose and blending of other components. From the viewpoint of emulsion stability, (a) :( b) = 1: 2 to 1: 7 is preferable, and 1: 3 to 1: 5 is more preferable.

Component (c) L-theanine used in the present invention is a kind of amino acid, is a water-soluble white crystalline powder, is a component of green tea umami, and is known to have an effect of suppressing excitement by caffeine In the present invention, together with the component (a), the moisturizing effect is synergistically shown on the skin after washing. L-theanine used in the present invention is not particularly limited as long as it is usually used in cosmetics. Examples of commercially available products include suntheanine (manufactured by Taiyo Kagaku).

  The content of the component (c) L-theanine in the cleansing cosmetic is not particularly limited as long as the object of the present invention is not impaired, and can be appropriately adjusted depending on the purpose and the blending of other components. 0.05% or more and 5.0% or less, and more preferably 0.5% or more and 3.0% or less.

The water of component (d) used in the present invention gives moisture to the skin and gives a fresh feeling of use and a refreshing feeling.

The content of the component (d) water in the cleansing cosmetic is not particularly limited as long as the object of the present invention is not impaired, and can be appropriately adjusted depending on the object and the blending of other components. 0.0-95.0% is preferable, and 30.0-70.0% is more preferable. When the component (d) is used within this range, a cleansing cosmetic excellent in fresh use feeling can be obtained.

The cleansing cosmetic composition of the present invention is capable of emulsifying an oil agent containing the component (b) by containing the component (a), and is substantially free of a surfactant for emulsification. It is what. Thereby, it becomes especially excellent in terms of safety such as irritation to the skin, and can be applied to cleansing cosmetics for sensitive skin. Here, “substantially not contained” means that it is not contained at all, or even if it is contained, it is an extremely small amount that does not affect the present invention, and the content is less than 0.1%. That means.

In addition to the above components, the cleansing cosmetic composition of the present invention may contain more component (b) than neutralized component by neutralizing component (a) with a basic substance. It becomes possible, and it can be made more preferable from the viewpoint of the cleansing effect. The kind of basic substance is not particularly limited, and a known basic substance can be freely selected and used. Specifically, for example, inorganic basic substances such as sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, sodium phosphate, disodium hydrogen phosphate, monoethanolamine, triethanolamine, diisopropanolamine Examples include basic substances such as organic amines such as aminomethyl propanol and sodium lactate, ammonia, and basic amino acids such as L-arginine, L-lysine, histidine, ornithine, and canavanine. Can be used. The pH of the aqueous solution when neutralized is not particularly limited, but if it can be prepared so that the pH at 25 ° C. is 6.5 or more and 7.5 or less, the cleansing effect is more excellent. The pH here can be measured using a glass electrode type hydrogen ion concentration meter (manufactured by Horiba, Ltd.).

In addition to the above components, the cleansing cosmetic composition of the present invention further includes components used in ordinary cosmetics, such as surfactants, electrolytes, polymer substances, moisturizing ingredients, cosmetic ingredients, bactericides, antiseptics, inorganic powders, Organic powders, antioxidants, pigments, fragrances and the like can be used within a range not impairing the effects of the present invention.

As a method for producing the cleansing cosmetic composition of the present invention, the water-soluble polymer of the component (a) is added to the water of the component (d) and the T.I. K. Using HOMODISPER (manufactured by TOKUSHU KIKA), the mixture is stirred and swollen. It can be obtained by stirring and emulsifying the component (b) at 25 ° C. while adding a liquid oil agent, and further mixing and dispersing the component (c) L-theanine.

  Examples of the method of using the cleansing cosmetic composition of the present invention include a method of using it by hand, a method of using it by impregnating a nonwoven fabric and the like.

Next, although an Example is given and this invention is demonstrated further in detail, this invention is not restrict | limited at all by these. First, a synthesis example of the component (a) of the present invention will be given and described in detail. Component (a) of the present invention is not limited to these synthesis examples.

[Synthesis Example 1]
In a 500 mL four-necked flask equipped with a stirrer, a thermometer, a nitrogen blowing tube and a cooling tube, 45 g (0.625 mol) of acrylic acid and (meth) acrylic acid alkyl ester having 18 to 24 carbon atoms in the alkyl group Blemmer VMA70 (manufactured by NOF Corporation: 10-20 parts by mass of stearyl methacrylate, 10-20 parts by mass of eicosanyl methacrylate, 59-80 parts by mass of behenyl methacrylate, and 1 mass of tetracosanyl methacrylate 1.35 g of a mixture of less than 1 part), 0.05 g of pentaerythritol allyl ether, 150 g of normal hexane and 0.081 g (0.00035 mol) of 2,2′-azobismethylisobutyrate. Subsequently, after stirring and mixing uniformly, nitrogen gas was blown into the solution in order to remove oxygen present in the upper space of the reaction vessel, the raw material and the solvent. Subsequently, it was made to react for 4 hours, hold | maintaining at 60-65 degreeC under nitrogen atmosphere. After the completion of the reaction, the resulting slurry was heated to 90 ° C. to distill off normal hexane, and further dried under reduced pressure at 110 ° C. and 10 mmHg for 8 hours to obtain (meth) acrylic acid / ( 43 g of a meth) acrylic acid alkyl ester copolymer was obtained.

[Synthesis Example 2]
In Synthesis Example 1, (meth) acrylic acid / (meth) acrylic in the form of white fine powder in the same manner as in Example 1 except that the amount of use of Blemmer VMA70 (manufactured by NOF Corporation) was changed to 1.58 g. 44 g of acid alkyl ester copolymer was obtained.

[Synthesis Example 3]
In Synthesis Example 1, (meth) acrylic acid / (meth) acrylic in the form of white fine powder in the same manner as in Example 1 except that the amount of use of Blemmer VMA70 (manufactured by NOF Corporation) was changed to 1.80 g. 45 g of acid alkyl ester copolymer was obtained.

  The component (a) thus obtained may be used as it is in cosmetics, but can also be used after being swollen in water. For example, a swollen product dispersed in pure water such as deionized water and swollen for 1 hour at a homomixer of 3000 to 5000 rotations can be blended in the cleansing cosmetic. Hereinafter, examples and comparative examples of cleansing cosmetics that are products of the present invention using the above synthesis examples will be described.

Cleansing cosmetics: Examples 1-9 and Comparative Examples 1-5
The cleansing cosmetics listed in Tables 1 to 3 below are prepared by the following manufacturing method, and the solid water-in-oil type foundation prepared by the following prescription and manufacturing method is used as a cleansing object: 1) cleansing effect, 2) Ease of washing and 3) Evaluation of the three items of the skin moisturizing effect after washing was carried out by the following evaluation methods and criteria, and the results are shown in Tables 1 to 3.

Formulation of solid water-in-oil foundation (cleansing target)
(Ingredient) (%)
1. Organically modified smectite 1.0
2. Ethanol 5.0
3. 1,2-pentanediol 2.0
4). Sodium chloride 0.5
5. Citric acid 0.1
6). Sodium citrate 0.1
7). Perfume appropriate amount 8. Purified water remaining 9. Methyl paraoxybenzoate 0.2
10. Barium sulfate coated mica titanium 1.5
11. Silicone-coated titanium oxide 7.5
12 Silicone-coated yellow iron oxide 0.4
13. Silicone coated bengara 0.07
14 Silicone-coated black iron oxide 0.01
15. Silicone surfactant * 3 2.0
16. Polyoxyethylene dipolyhydroxystearate * 4 1.0
17. Octamethylcyclotetrasiloxane 7.0
18. Isononyl isononanoate 10.0
19. Isotridecyl isononanoate 3.0
20. Sucrose fatty acid ester 1.0
21. Microcrystalline wax 6.0
22. Tocopherol acetate 0.05
* 3 KF-6028 (manufactured by Shin-Etsu Chemical Co., Ltd.)
* 4 ARASER P-135 (Crowda)

Production method A of solid water-in-oil foundation (cleansing target): Components 1 to 9 are uniformly dissolved at 70 ° C.
B: Components 10 to 22 are mixed uniformly at 70 ° C.
C: A is added to B and emulsified.
D: Pour into a container at 70 ° C. and cool to room temperature after filling.

[Production methods of Examples 1 to 9 and Comparative Examples 1 to 5]
1. Ingredients (1) to (2) and (6) to (10) are uniformly mixed and dissolved and swollen.
2. Ingredients (3) to (5) are mixed and dissolved uniformly.
The target cleansing cosmetic was obtained by adding 2 to 3.1 and dispersing and emulsifying.

[Evaluation methods of Examples 1 to 9 and Comparative Examples 1 to 5]
Each expert panel used each evaluation test by the following methods by 20 professional panels.
Apply 0.5 g of the water-in-oil foundation (cleansing target) to the face, and after 3 hours, take 2 g of the cleansing cosmetics in Tables 1 to 3 and cleanse for 1 minute with water. Washed off and evaluated. The evaluation contents and scores for each evaluation were as follows.
[Evaluation 1] Cleansing effect (visual observation)
4 points: The foundation was completely washed away.
3 points: The foundation was almost washed away.
2 points: The foundation remains in some places.
1 point: The foundation has hardly fallen.
[Evaluation 2] Ease of rinsing 4 points: The rinsing was possible within 15 seconds against running water.
3 points: Flushed with running water in 15 to 30 seconds.
2 points: It was necessary to wash away water for 30 seconds or more.
1 point: The water could not be washed away.
[Evaluation 3] Skin moisturizing effect after washing 4 points: The skin moisturizing effect lasted for 6 hours or more.
3 points: Skin moisturizing effect lasted for 3 hours or more.
2 points: The skin moisturizing effect lasted for 1 hour or more.
1 point: No skin moisturizing effect.

The scores of the evaluation results for each evaluation were totaled and evaluated according to the following evaluation criteria. In addition, in this invention, the evaluation of B or more which is 50 points or more was preferable with respect to evaluation of 80 perfect marks.
[Evaluation criteria]
(Evaluation): (Score)
A: 70 points or more A: 60 points or more and 69 points or less B: 50 points or more and 59 points or less C: 40 points or more and 49 points or less D: 30 points or more and 39 points or less E: 29 points or less

[Evaluation 4] Stability over time 40 mL of cleansing cosmetics shown in Tables 1 to 3 are poured into a wide-mouthed standard bottle (PS-No. 6), the cap is closed, and left in a 50 ° C. constant temperature bath for 1 month to separate. Observation was made visually and a determination was made according to the following criteria.
(Criteria): (Judgment)
No separation is allowed: ◎
Separated layer is less than 1 mm and has no problem: ○
The level at which the separated layer is 1 mm or more and 5 mm or less is a problem: Δ
The separated layer is 5 mm or more: ×

As is apparent from the results of Tables 1 to 3, Examples 1 to 9 according to the present invention have excellent cleansing effects, good washing with water, and also have a moisturizing effect on the washed skin, and over time. There was an effect of excellent stability. On the other hand, Comparative Example 1 and Comparative Example 2 containing an alkyl acrylate acrylate copolymer instead of the component (a) were not easily washed away with water, and the stability over time was insufficient. Further, Comparative Example 2 containing no component (c) is inferior in the moisturizing effect of the skin after washing and ease of washing, Comparative Example 3 containing glycylglycine which is another amino acid instead of the component (c), In Comparative Example 4 containing glycerin as another moisturizing agent instead of component (c), the moisturizing effect and washing off effect on the skin after washing were insufficient, and none satisfying all of them was obtained.

[Evaluation of moisturizing effect by conductance value]
It verified from the conductance value measurement about the moisturizing effect of the skin after washing. Table 4 shows measured values of conductance values after cleansing of Example 4 and Comparative Example 3. As in the previous test, after applying the solid water-in-oil foundation to the face and cleansing with each cleansing cosmetic, the conductance value was measured with SKICON-200EX (manufactured by IBS), and the results are shown in the table below. 3 shows. In all cases, the blank before applying the solid water-in-oil foundation was set to 100.

From Table 4 to Example 4, in any case after cleansing, the value was higher than the conductance value of the blank before cleansing, indicating that the moisturizing effect was maintained. On the other hand, in Comparative Example 2, after 2 hours, the conductance value was lower than before cleansing, and the moisturizing effect was not sustained.

Example 10 Cleansing Cosmetic (Ingredient) (%)
1. Isononyl isononanoate 15.0
2. Dimethylpolysiloxane 5.0
3. Water-soluble polymer (a) of Synthesis Example 2 5.0
4). L-Theanine 2.0
5. Glycylglycine 1.0
6). Ethanol 3.0
7). Glycerin 10.0
8.1,2-Pentanediol 1.0
9. Sodium hydroxide appropriate amount10. Purified water remaining amount 11. Cellulose powder 3.0

1. Ingredients (1) and (2) are uniformly mixed and dissolved.
2. Ingredients (3) to (10) are uniformly mixed and dissolved and swollen.
A cleansing cosmetic was obtained by adding 1 to 3.2 and dispersing and emulsifying.

The cleansing cosmetic of Example 10 had a cleansing effect, washes well with water, had a moisturizing effect on the washed skin, and was excellent in stability over time.

Example 11 Cleansing Cosmetic (Ingredient) (%)
1. Isotridecyl isononanoate 20.0
2. Light liquid isoparaffin 5.0
3. Water-soluble polymer (a) of Synthesis Example 3 5.0
4). L-Theanine 2.0
5. Serine 1.0
6). Ethanol 3.0
7). Glycerin 10.0
8). Sodium hydroxide appropriate amount 9. Purified water remaining amount 10. Cellulose fiber 3.0

1. Ingredients (1) and (2) are uniformly mixed and dissolved.
2. Ingredients (3) to (10) are uniformly mixed and dissolved and swollen.
A cleansing cosmetic was obtained by adding 1 to 3.2 and dispersing and emulsifying.

The cleansing cosmetic of Example 11 had a cleansing effect, washes well with water, had a moisturizing effect on the washed skin, and was excellent in stability over time.

Claims (6)

The following components (a) to (d):
Component (a): A copolymer comprising acrylic acid or methacrylic acid, acrylic acid alkyl ester or methacrylic acid alkyl ester, and a compound having two or more ethylenically unsaturated groups, and an electrolyte. Water-soluble polymer that exhibits thickening when contained
Component (b): Oil liquid at 25 ° C.
Component (c): L-theanine
Ingredient (d): Water
Contains, the content of component (a) is characterized as to torque ranging cosmetic that is 2.5 to 15.0 wt%. The following components (a) to (d):
Component (a): A copolymer comprising acrylic acid or methacrylic acid, acrylic acid alkyl ester or methacrylic acid alkyl ester, and a compound having two or more ethylenically unsaturated groups, and an electrolyte. Water-soluble polymer that exhibits thickening when contained
Component (b): Oil liquid at 25 ° C.
Component (c): L-theanine
Ingredient (d): Water
Containing, content mass ratio of components (a) and (b) (a) :( b ) is 1: 2 to 1: 7, characterized in that there are a to torque ranging cosmetics Components (a) and containing the mass ratio of component (b) (a) :( b ) is 1: 2 to 1: 7 cleansing cosmetic composition of claim 1 Symbol mounting, characterized in that there. The component (b) is a monoester of a branched fatty acid having 6 to 10 carbon atoms and an alcohol having 5 to 18 carbon atoms, and is one or more ester oils that are liquid at 25 ° C. The cleansing cosmetic according to any one of -3. The cleansing cosmetic according to any one of claims 1 to 4, which is substantially free of a surfactant. Component (a) is 95.42 to 97.48% by mass of (meth) acrylic acid, 2.43 to 4.30% by mass of (meth) acrylic acid alkyl ester having 18 to 24 carbon atoms in the alkyl group, and ethylene. 6. A (meth) acrylic acid / (meth) acrylic acid alkyl ester copolymer which is 0.08 to 0.29% by mass of a compound having two or more polymerizable unsaturated groups. The cleansing cosmetic according to any one of the items.