Skin composition

Abstract

To provide a skin composition that allows stickiness of skin after its application to be significantly reduced by simple and easy means, and enables good moisture of skin to be maintained well.SOLUTION: A skin composition contains the following component A and the following component B. The component A is coenzyme Q10 and the component B is ectoine.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a skin composition.

Background Art

[0002] One of the functions required for skin care preparations is "moisturizing". Moisturizing means imparting moisture to the skin and maintaining that moisture. Conventionally, various attempts have been made to moisturize the skin, such as supplementing the skin with moisture, preventing the evaporation of moisture in the skin, and maintaining moisture.

[0003] More specifically, components that constitute intercellular lipids in keratinocytes, such as ceramides, sphingolipids, and lecithin; components that exist within keratinocytes, such as natural moisturizing factors (NMF); components that originally exist in the dermis, such as hyaluronic acid and collagen; various components that exhibit moisturizing effects, such as polyhydric alcohols, oils, saccharides, and plant extracts, are formulated in the preparation. Among such components, coenzyme Q10 has continued to attract attention as a component having extremely excellent moisturizing ability.

[0004] However, while coenzyme Q10 can exhibit extremely excellent moisturizing ability, when trying to formulate it at a high concentration in a preparation, there are problems such as a significant deterioration in the feel of use and a sticky feeling continuing after application. Therefore, since coenzyme Q10 cannot be formulated at a high concentration and the desired moisturizing effect cannot be sufficiently imparted, there is a problem that a good moisturizing effect cannot be sustained.

[0005] Various attempts have been made to suppress stickiness in preparations containing coenzyme Q10 (see, for example, Patent Documents 1 and 2). Although these attempts can reduce the stickiness after application to some extent, conventional attempts have drawbacks such as requiring ingenuity in formulation and being time-consuming to prepare. Therefore, those skilled in the art are required to develop both a technique for suppressing the stickiness of a preparation containing coenzyme Q10 by simple means and a technique for sustaining the desired moisturizing effect.

Prior Art Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2007-077084 [Patent Document 2] Japanese Patent Publication No. 2013-136545 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The present invention has been made in view of the above-mentioned prior art, and aims to provide a skin composition that can significantly reduce the sticky feeling after application by simple means and exhibits excellent moisturizing effects. [Means for solving the problem]

[0008] In other words, the present invention provides a skin composition comprising the following component A and the following component B. Ingredient A: Coenzyme Q10 Ingredient B: Ectoin

[0009] It is preferable that the content of component A is greater than 0.3% by mass and 1% by mass or less.

[0010] The content of component B is preferably 0.1% by mass or more and 1% by mass or less.

[0011] The above skin composition preferably further contains the following component C. Ingredient C: Serine

[0012] The above skin composition preferably further contains the following component D. Component D: At least one selected from the group consisting of hydrolyzed hyaluronic acid, hyaluronic acid salts, and hyaluronic acid derivatives.

[0013] The above skin composition preferably further contains the following component E. Ingredient E: Niacinamide [Effects of the Invention]

[0014] The skin composition of the present invention, by satisfying the above constituent requirements, has the effect of significantly reducing the feeling of stickiness after application. Furthermore, despite being non-sticky, the skin composition of the present invention exhibits an exceptionally superior effect in terms of sustained moisture, providing a moist and pleasant feeling that lasts. [Modes for carrying out the invention]

[0015] The present invention provides a skin composition characterized by containing component A: coenzyme Q10 and component B: ectoin.

[0016] The details of each component used in the skin composition of the present invention are described below.

[0017] [Component A] The above-mentioned component A is coenzyme Q10. Coenzyme Q10 is a compound also known as coenzyme Q10, CoQ10, ubiquinone, or ubicarenone. In this invention, by using component A, it is possible to provide the skin with significantly superior moisture, or so-called moisturizing effect, after application.

[0018] Furthermore, the above-mentioned component A is not particularly limited, whether it is a single raw material or a mixed raw material with other components, as long as the desired effect is achieved. In the present invention, the above-mentioned component A can be a commercially available product. Examples of commercially available coenzyme Q10 include Solfonte Q10, Phytopresome Q10, Phytopresome Lipo-Q, and Presome Q10 (trade names, all manufactured by Nippon Seika Co., Ltd.).

[0019] The content of component A in the skin composition of the present invention is not particularly limited as long as the desired effect can be fully exerted. Usually, from the viewpoint of imparting moisture, it is preferably 0.1% by mass or more, more preferably more than 0.3% by mass, in 100% by mass of the composition. Further, from the viewpoint of suppressing excessive stickiness, it is preferably 1.5% by mass or less, more preferably 1% by mass or less, in 100% by mass of the composition. The content of the above component A is the amount converted to the pure component.

[0020] [Component B] The above component B is ectoin. Ectoin is an amino acid having a structure in which the side chain forms a ring among amino acids, and is a compound classified as a heterocyclic amino acid (also called a cyclic amino acid). Further, ectoin is also a component mainly formulated as an emollient in skin compositions. [[ID=??]]

[0021] In the present invention, surprisingly, by using the above component B and the above component A in combination, a particularly remarkable effect that has never been known conventionally, that is, the excessive stickiness after application caused by component A can be reduced, is exerted. Therefore, even when the content of the above component A in the skin composition is more than 0.3% by mass, it is possible to reduce the stickiness.

[0022] The above component B is not particularly limited as long as the desired effect can be exerted, whether it is a single raw material or a mixed raw material with other components. In the present invention, commercially available products can be used as the above component B. Examples of commercially available products of ectoin include RonaCare Ection, RonaCare Cyclopeptide-5 (trade names, both manufactured by Merck), Ectoin natural (trade name, manufactured by Bitop AG), and the like.

[0023] It should be noted that in the provided text, there seems to be an error in line 7 where the tag is "??" instead of a proper number. If this is a mistake, please correct it according to the actual situation for a more accurate translation.The content of component B in the skin composition of the present invention is not particularly limited as long as the desired effect is sufficiently achieved. However, from the viewpoint of reducing excessive stickiness caused by component A and providing sustained moisture, it is preferably 0.01% by mass or more, and more preferably 0.1% by mass or more, per 100% by mass of the composition. Furthermore, from the viewpoint of usability, it is preferably 2.0% by mass or less, and more preferably 1.0% by mass or less, per 100% by mass of the composition. Note that the content of component B is the amount converted to pure content.

[0024] In the present invention, from the viewpoint of significantly reducing the excessive stickiness after application caused by component A, the ratio of the content of component B to component A (component B / component A) is preferably in the range of 0.01 to 20.0, more preferably in the range of 0.02 to 10.0, even more preferably in the range of 0.1 to 5.0, and most preferably in the range of 0.3 to 2.0.

[0025] In addition to the above-mentioned components A and B, the skin composition of the present invention preferably further contains component C, from the viewpoint of significantly reducing the excessive stickiness after application caused by component A.

[0026] [Component C] The above component C is serine. Serine is a type of amino acid that has an alcohol in its side chain. Surprisingly, in this invention, by further combining component C with the above-mentioned combination system of component A and component B, it is possible to significantly reduce the excessive stickiness after application caused by component A, exhibiting a remarkably significant effect that was completely unknown in the past.

[0027] Furthermore, the above-mentioned component C is not particularly limited, whether it is a single raw material or a mixed raw material with other components, as long as the desired effect is achieved. In the present invention, the above-mentioned component C can be a commercially available product. Examples of commercially available serine products include L-serine (trade name, manufactured by Nippon Rikagaku Yakuhin Co., Ltd.), L-serine (trade name, manufactured by Junsei Kagaku Co., Ltd.), PPAA-C (trade name, manufactured by Seiwa Kasei Co., Ltd.), PRODEW400, PRODEW500, PRODEW600 (all trade names, manufactured by Ajinomoto do Brasil Ind.e.com.de Alimentos Ltda.).

[0028] The content of component C in the skin composition of the present invention is not particularly limited as long as the desired effect is sufficiently achieved. However, from the viewpoint of significantly reducing the excessive stickiness caused by component A and enhancing sustained moisture, it is preferably 0.001% by mass or more, and more preferably 0.01% by mass or more, per 100% by mass of the composition. Furthermore, from the viewpoint of usability, it is preferably 1.0% by mass or less, and more preferably 0.5% by mass or less, per 100% by mass of the composition. Note that the content of component C is the amount converted to pure content.

[0029] The skin composition of the present invention, by combining component A and component B as described above, or by combining component A, component B, and component C as described above, can reduce the excessive stickiness after application caused by component A, and moreover, it can exhibit a remarkably superior effect of providing long-lasting moisture, making it possible to further incorporate component D, which provides excellent moisture.

[0030] [Component D] The above component D is at least one selected from the group consisting of hydrolyzed hyaluronic acid, hyaluronic acid salts, and hyaluronic acid derivatives. Hyaluronic acid is a high molecular weight polysaccharide compound in which disaccharides consisting of glucosidic bonds between N-acetyl-D-glucosamine and D-glucuronic acid are repeated units.

[0031] In the present invention, hydrolyzed hyaluronic acid is obtained by reducing the molecular weight of the above-mentioned hyaluronic acid. Examples of hyaluronic acid salts include sodium salts, potassium salts, and basic amino acid salts. Examples of hyaluronic acid derivatives include acetylated hyaluronic acid, which is obtained by acetylating hyaluronic acid; hyaluronic acid propylene glycol ester, which is obtained by esterifying the carboxyl group at position 6 of the D-glucuronic acid of hyaluronic acid with propylene glycol; and salts of these hyaluronic acid derivatives. These components D may be used individually or in appropriate combinations of two or more.

[0032] Furthermore, the above-mentioned component D is not particularly limited as long as the desired effect is achieved, whether as a single ingredient or a mixture with other ingredients. In the present invention, commercially available products can be used for component D. Examples of commercially available hydrolyzed hyaluronic acid include Hyalo-Oligo (product name, manufactured by Kewpie Corporation). Examples of commercially available sodium hyaluronate include Hyaluronic Acid HA-LQ (product name, manufactured by Kewpie Corporation), Hyaluronic Acid FCH-60, 80, 120, 150, 200 (product names, all manufactured by Kikkoman Biochemifa Co., Ltd.). Examples of commercially available acetylated sodium hyaluronate include Acetylated Sodium Hyaluronate (product name, manufactured by Shiseido Co., Ltd.).

[0033] The content of component D in the skin composition of the present invention is not particularly limited as long as the desired effect is sufficiently achieved. However, from the viewpoint of further enhancing sustained moisture, it is generally preferable to have 0.0001% by mass or more, and more preferably 0.001% by mass or more, per 100% by mass of the composition. Furthermore, from the viewpoint of preventing stickiness, it is preferable to have 0.5% by mass or less, and more preferably 0.1% by mass or less, per 100% by mass of the composition. Note that the above content of component D is the amount converted to pure content.

[0034] The skin composition of the present invention can reduce excessive stickiness after application caused by component A while maintaining moisture, thus allowing for the further incorporation of functional component E without affecting the user experience.

[0035] [Component E] The above ingredient E is niacinamide. Niacinamide is nicotinamide, also known as vitamin B3, and is an ingredient that exhibits wrinkle formation inhibiting effects.

[0036] Furthermore, the above-mentioned component E is not particularly limited, whether it is a single raw material or a mixed raw material with other components, as long as the desired effect is achieved. In the present invention, the above-mentioned component E can be a commercially available product. Examples of commercially available niacinamides include nicotinamide and Niacinamide PC (trade names, both manufactured by DSM).

[0037] The content of component E in the skin composition of the present invention is not particularly limited as long as it does not affect the feeling of stickiness, but it is preferably 0.01% by mass or more, and more preferably 0.1% by mass or more, per 100% by mass of the composition. Furthermore, from the viewpoint of usability, it is preferably 10% by mass or less, and more preferably 6% by mass or less, per 100% by mass of the composition. Note that the above content of component E is the amount converted to pure content.

[0038] The dosage form of the skin composition of the present invention is not particularly limited, but from the viewpoint of suppressing stickiness and exhibiting a moisturizing effect with excellent persistence, an emulsifier type is preferred. In the present invention, a nonionic surfactant is used as the emulsifier. In this specification, the nonionic surfactant may be referred to as component F.

[0039] Examples of the above-mentioned component F include sorbitan fatty acid esters, glycerin fatty acid esters, and alkylene oxide adducts thereof; alkylene oxide adducts of castor oil or hydrogenated castor oil; polyglycerin fatty acid esters, glycol fatty acid esters, polyoxyalkylene fatty acid esters (polyethylene glycol fatty acid esters), polyoxyalkylene alkyl ethers, polyoxyalkylene alkylphenol ethers, polyoxyethylene sorbitol tetra fatty acid esters, polyoxyethylene alkylphenyl formaldehyde condensates, polyoxyethylene sterols and their derivatives, polyoxyethylene lanolin and its derivatives, polyoxyethylene beeswax derivatives, and sugar esters. These components F may be used individually or in appropriate combinations of two or more.

[0040] In the present invention, among the above-mentioned component F, it is preferable to use a nonionic surfactant selected from the group consisting of sorbitan fatty acid esters, glycerin fatty acid esters, alkylene oxide adducts thereof, and polyglycerin fatty acid esters, from the viewpoint of providing excellent storage stability (emulsification stability) of the formulation, which is important for exhibiting the effects of the present invention.

[0041] Specific examples of sorbitan fatty acid esters include sorbitan stearate, sorbitan isostearate, sorbitan oleate, sorbitan palmitate, sorbitan myristate, sorbitan sesquistearate, sorbitan sesquioleate, sorbitan tristearate, and sorbitan trioleate. These components may be used individually or in appropriate combinations of two or more.

[0042] Among the above sorbitan fatty acid esters, it is preferable to use sorbitan stearate, sorbitan isostearate, or sorbitan oleate from the viewpoint of providing excellent storage stability (emulsification stability) of the formulation, which is important for exhibiting the effects of the present invention.

[0043] Furthermore, the above-mentioned sorbitan fatty acid ester is not particularly limited, whether it is a single raw material or a mixed raw material with other components, as long as the desired effect is achieved. In the present invention, commercially available sorbitan fatty acid esters can be used. Examples of commercially available sorbitan stearate include Rheodol SP-S10V (product name, manufactured by Kao Corporation), examples of commercially available sorbitan isostearate include NIKKOL SI-10RV (product name, manufactured by Nippon Surfactant Industry Co., Ltd.), and examples of commercially available sorbitan monooleate include Rheodol SP-O10V (product name, manufactured by Kao Corporation).

[0044] Specific examples of glycerin fatty acid esters include glyceryl stearate, glyceryl laurate, glyceryl caprylate, glyceryl coconut oil, glyceryl myristate, glyceryl isostearate, glyceryl monohydroxystearate, glyceryl oleate, glyceryl linoleate, glyceryl ricinoleate, glyceryl erucate, glyceryl behenate, wheat germ oil fatty acid glycerides, safflower oil fatty acid glycerides, hydrogenated soybean fatty acid glycerides, saturated fatty acid glycerides, cottonseed oil fatty acid glycerides, monomyristate monoisostearate, monobovine fatty acid glycerides, monolanolin fatty acid glycerides, glyceryl sesquioleate, glyceryl distearate, diisostearate glyceryl, and glyceryl diarachinate. These components may be used individually or in combination of two or more as appropriate.

[0045] Among the glycerin fatty acid esters mentioned above, it is preferable to use glyceryl stearate, glyceryl laurate, and glyceryl caprylate, from the viewpoint of providing excellent storage stability (emulsification stability) of the formulation, which is important for exhibiting the effects of the present invention.

[0046] Furthermore, the above-mentioned glycerin fatty acid ester is not particularly limited as long as the desired effect is achieved, whether as a single raw material or a mixed raw material with other components. In the present invention, commercially available glycerin fatty acid esters can be used. Examples of commercially available glyceryl stearate include NIKKOL MGS-BV2 (trade name, manufactured by Nippon Surfactant Industry Co., Ltd.), examples of commercially available glyceryl laurate include Sunsoft No. 750-C (trade name, manufactured by Taiyo Kagaku Co., Ltd.), and examples of commercially available glyceryl caprylate include Sunsoft No. 700P-2-C (trade name, manufactured by Taiyo Kagaku Co., Ltd.).

[0047] Specific examples of alkylene oxide adducts of sorbitan fatty acid esters include POE(20) sorbitan monostearate, POE(20) sorbitan monooleate, POE(20) sorbitan monopalmitate, POE(6) sorbitan monostearate, POE(20) sorbitan tristearate, POE(20) sorbitan trioleate, and POE(6) sorbitan monolaurate. "POE" is an abbreviation for polyoxyethylene, and the number in parentheses represents the number of moles of ethylene oxide added. The number of moles of ethylene oxide added is not particularly limited, but from the viewpoint of storage stability (emulsification stability), it is preferably 2 to 100, and more preferably 4 to 90. These components may be used individually or in appropriate combinations of two or more.

[0048] Among the alkylene oxide adducts of the above-mentioned sorbitan fatty acid esters, it is preferable to use POE(20) sorbitan monostearate, POE(20) sorbitan monooleate, or POE(20) sorbitan monopalmitate, from the viewpoint of providing excellent storage stability (emulsification stability) of the formulation, which is important for exhibiting the effects of the present invention.

[0049] Furthermore, the alkylene oxide adduct of the above-mentioned sorbitan fatty acid ester is not particularly limited, whether it is a single raw material or a mixed raw material with other components, as long as the desired effect is achieved. In the present invention, commercially available products can be used as the alkylene oxide adduct of the above-mentioned sorbitan fatty acid ester. Examples of commercially available products of POE(20) sorbitan monostearate include Rheodol TW-S120V (product name, manufactured by Kao Corporation), examples of commercially available products of POE(20) sorbitan monooleate include Rheodol TW-O120V (product name, manufactured by Kao Corporation), and examples of commercially available products of POE(20) sorbitan monopalmitate include NIKKOL TP-10 (product name, manufactured by Nippon Surfactant Industry Co., Ltd.).

[0050] Specific examples of alkylene oxide adducts of glycerin fatty acid esters include POE(40) glyceryl monostearate, POE(5) glyceryl triisostearate, POE(10) glyceryl isostearate, POE(7) glyceryl coconut oil fatty acid, POE(8) (caprylic / capric acid) glyceryl, and POE(30) glyceryl oleate. "POE" is an abbreviation for polyoxyethylene, and the number in parentheses represents the number of moles of ethylene oxide added. The number of moles of ethylene oxide added is not particularly limited, but from the viewpoint of storage stability (emulsification stability), it is preferably 2 to 100, and more preferably 4 to 90. These components may be used individually or in appropriate combinations of two or more.

[0051] Among the alkylene oxide adducts of the above-mentioned glycerin fatty acid esters, it is preferable to use POE(40) glyceryl monostearate, POE(5) glyceryl triisostearate, or POE(10) glyceryl isostearate, from the viewpoint of providing excellent storage stability (emulsification stability) of the formulation, which is important for exhibiting the effects of the present invention.

[0052] Furthermore, the alkylene oxide adduct of the glycerin fatty acid ester described above is not particularly limited, whether it is a single raw material or a mixed raw material with other components, as long as the desired effect is achieved. In the present invention, commercially available products can be used as the alkylene oxide adduct of the glycerin fatty acid ester described above. Examples of commercially available products include NIKKOL MYS-40V (trade name, manufactured by Nippon Surfactant Industry Co., Ltd.), EMALEX GWIS-305 (trade name, manufactured by Nippon Emulsion Co., Ltd.), and GWIS-110 (trade name, manufactured by Nippon Emulsion Co., Ltd.).

[0053] Specific examples of polyglycerin fatty acid esters include, for example, polyglyceryl caprate such as polyglyceryl-2 caprate, polyglyceryl-3 caprate, polyglyceryl-4 caprate, and polyglyceryl-10 caprate; polyglyceryl laurate such as polyglyceryl-2 laurate, polyglyceryl-4 laurate, polyglyceryl-5 laurate, polyglyceryl-6 laurate, and polyglyceryl-10 laurate; polyglyceryl myristate such as polyglyceryl-5 myristate, polyglyceryl-6 myristate, and polyglyceryl-10 myristate; polyglyceryl palmitate such as polyglyceryl-3 palmitate and polyglyceryl-10 palmitate; and polyglyceryl stearate. Examples include polyglyceryl stearate such as -2, polyglyceryl stearate-3, polyglyceryl stearate-4, polyglyceryl stearate-5, polyglyceryl stearate-6, and polyglyceryl stearate-10; polyglyceryl isostearate such as polyglyceryl-2, polyglyceryl-4, polyglyceryl-6, and polyglyceryl-10; polyglyceryl oleate such as polyglyceryl-2, polyglyceryl-3, polyglyceryl-4, polyglyceryl-5, polyglyceryl-6, and polyglyceryl-10; and polyglyceryl-10 linoleate. The integers listed after the above components represent the average degree of polymerization of polyglycerin. These components may be used individually or in combination of two or more as appropriate.

[0054] Among the polyglycerin fatty acid esters mentioned above, it is preferable to use polyglyceryl-10 laurate, polyglyceryl-10 myristate, and polyglyceryl-10 stearate, from the viewpoint of providing excellent storage stability (emulsification stability) of the formulation, which is important for exhibiting the effects of the present invention.

[0055] Furthermore, the above-mentioned polyglycerin fatty acid ester is not particularly limited as long as the desired effect is achieved, whether as a single raw material or a mixed raw material with other components. In the present invention, commercially available polyglycerin fatty acid esters can be used. Examples of commercially available polyglyceryl-10 laurate include SY Glister ML-750 (product name, manufactured by Sakamoto Pharmaceutical Co., Ltd.), examples of commercially available polyglyceryl-10 myristate include Decaglyn 1-M (product name, manufactured by Nippon Surfactant Industry Co., Ltd.), and examples of commercially available polyglyceryl-10 stearate include Sunsoft Q-18Y-C (product name, manufactured by Taiyo Kagaku Co., Ltd.).

[0056] The content of component F in the skin composition of the present invention is not particularly limited, but from the viewpoint of providing excellent storage stability (emulsification stability), it is preferably 0.05% by mass or more, and more preferably 0.1% by mass or more, per 100% by mass of the composition. Furthermore, from the viewpoint of usability, it is preferably 2.0% by mass or less, and more preferably 1.5% by mass or less, per 100% by mass of the composition. Note that the above content of component F is the amount converted to pure content.

[0057] The skin composition of the present invention may further contain a thickening polymer from the viewpoint of improving storage stability (emulsification stability). Examples of thickening polymers include water-soluble natural polymers, semi-synthetic polymers, and synthetic polymers. In this specification, the thickening polymer may be referred to as component G.

[0058] Examples of component G include natural polymers such as gum arabic, tragacanth gum, guar gum, locust bean gum, karaya gum, xanthan gum, iris moss, quince seed, gelatin, shellac, rosin, and casein; semi-synthetic polymers such as sodium carboxymethylcellulose, hydroxyethylcellulose, methylcellulose, ethylcellulose, sodium alginate, ester gum, nitrocellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, and crystalline cellulose; and synthetic polymers such as polyvinyl alcohol, sodium polyacrylate, carboxyvinyl polymer, (acrylates / alkyl acrylate (C10-30)) crosspolymer, (acrylic acid / alkyl methacrylate copolymer), polyvinyl methylcellulose, and polyamide resin. These components G may be used individually or in appropriate combinations of two or more types.

[0059] The content of component G in the skin composition of the present invention is not particularly limited, but from the viewpoint of improving storage stability (emulsification stability), it is preferably 0.01% by mass or more, and more preferably 0.1% by mass or more, per 100% by mass of the composition. Furthermore, from the viewpoint of usability, it is preferably 2.0% by mass or less, and more preferably 1.0% by mass or less, per 100% by mass of the composition. Note that the above content of component G is the amount converted to pure content.

[0060] [Other ingredients] In addition to the above-mentioned components, the skin composition of the present invention may appropriately contain, as long as it does not impair the effects of the present invention, oils such as oils and fats, waxes, hydrocarbon oils, higher fatty acids, higher alcohols, fatty acid ester oils, and silicone oils; surfactants other than component F, such as anionic surfactants, cationic surfactants, and amphoteric surfactants; divalent or trivalent polyhydric alcohols; humectants, film-forming agents, sugar alcohols, UV absorbers, whitening agents, anti-inflammatory agents, cooling agents, pH adjusters, neutralizing agents, fragrances, preservatives, etc., depending on the purpose.

[0061] The remainder of the skin composition of the present invention is purified water. The amount of purified water is not particularly limited, but from the viewpoint of storage stability, it is preferably 30 to 95% by mass, and more preferably 50 to 90% by mass.

[0062] The method for producing the skin composition of the present invention is not particularly limited, but can be produced by known methods, for example. Specifically, examples include mixing the above-mentioned components and stirring using known methods, such as a disper mixer or disper mill, or emulsifying by a phase inversion emulsification method using a homomixer, but the present invention is not limited to these production methods.

[0063] The use of the skin composition according to one embodiment of the present invention is not particularly limited, but it is preferably used as a skin cosmetic, and more specifically, it is preferably used as a moisturizing cosmetic, a whitening cosmetic, an acne care cosmetic, or an anti-aging cosmetic for purposes such as wrinkle suppression and sagging suppression. Furthermore, the skin composition of the present invention may take the form of cosmetics, quasi-drugs, designated quasi-drugs, general merchandise, etc.

[0064] Furthermore, the areas to which the skin composition according to one embodiment of the present invention is applied are not particularly limited, but as an example, it can be used on the face (forehead, around the eyes, corners of the eyes, cheeks, around the mouth, etc.), arms, elbows, back of the hands, fingertips, feet, knees, heels, neck, décolleté, armpits, back, etc. [Examples]

[0065] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples. Unless otherwise specified, the amounts of each ingredient are expressed in "mass%".

[0066] (Sample preparation 1) According to the compositions listed in Tables 1 and 2, the skin compositions of Examples 1-10 and Comparative Examples 1-7 were prepared into emulsifier forms according to conventional methods and subjected to the following evaluation. The results are shown in Tables 1 and 2. Note that all amounts in the tables are converted to pure content.

[0067] (Test Example 1: Evaluation after application) Approximately 1g of each sample from the examples and comparative examples was placed in the palm of the hand and applied to both cheeks. Thirty minutes after application, sensory evaluation was conducted on the "suppression of stickiness" and "sustained moisturizing effect" of the applied area, and scores were assigned according to the evaluation criteria below. The evaluation was conducted under conditions of 25°C by 10 expert evaluators, and the final result was determined by combining the evaluations of each evaluator.

[0068] For "stickiness suppression," products that were not sticky during the evaluation were rated as "good." On the other hand, for "sustained moisturizing effect," products that provided a feeling of moisturizing hydration during the evaluation were rated as "good." Furthermore, the evaluation was determined based on the average score calculated according to the evaluation criteria below, according to the judgment criteria below.

[0069] <Evaluation Criteria> 5 points: Good 4 points: Fairly good 3 points: Average 2 points: Slightly poor 1 point: Defective

[0070] <Judgment criteria> ◎: Average 4.0 points or more ○: Average score of 3.0 or higher but less than 4.0 △: Average score between 2.0 and 3.0 ×: Average score below 2.0

[0071] [Table 1]

[0072] [Table 2]

[0073] The results shown in Tables 1 and 2 indicate that the skin compositions obtained in each example, compared to those obtained in each comparative example, exhibit significantly superior effects in terms of usability. Despite containing a high concentration of coenzyme Q10, they provide long-lasting moisture without the stickiness caused by coenzyme Q10.

[0074] As is clear from these results, the skin composition of the present invention is able to fully exhibit both effects that were difficult to achieve in conventional attempts: a high concentration of coenzyme Q10, yet without stickiness, and a long-lasting, moisturizing feeling. This results in a satisfactory user experience.

Claims

1. A skin composition comprising the following component A and the following component B, wherein the ratio of the content of component B to component A (component B / component A) is 0.3 to 2.

0. Component A: Coenzyme Q10 Ingredient B: Ectoin

2. The skin composition according to claim 1, wherein the content of component A is more than 0.3% by mass and 1% by mass or less.

3. The skin composition according to claim 1 or 2, wherein the content of component B is 0.1% by mass or more and 1% by mass or less.

4. The skin composition according to any one of claims 1 to 3, further comprising the following component C. Ingredient C: Serine

5. The skin composition according to any one of claims 1 to 4, further comprising the following component D. Component D: At least one selected from the group consisting of hydrolyzed hyaluronic acid, hyaluronic acid salts, and hyaluronic acid derivatives.

6. The skin composition according to any one of claims 1 to 5, further comprising the following component E. Ingredient E: Niacinamide

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