Cosmetic for skin

Abstract

To provide a cosmetic for skin having good spreadability and affinity to the skin during application, capable of delivering a superior moisturizing effect with a moderate film sensation to the skin after application, while exhibiting a superior non-sticky usability.SOLUTION: Provided is a cosmetic for skin characterized in that it comprises the following components A to D: Component A: a polyhydric alcohol, Component B: polyoxyethylene glycerin, Component C: polyoxyalkylene methyl glucoside, and Component D: diethylene glycol monoethyl ether.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a cosmetic preparation for skin. [Background technology]

[0002] Skin cosmetics used in skin care are required to have the primary function of preventing dryness of the skin and providing moisturizing and moisturizing effects.

[0003] Conventionally, attempts have been made to provide a moisturizing effect by forming a film on the skin using oil as a means of preventing dryness of the skin (see, for example, Patent Document 1). However, when a film is formed using oil, it not only has drawbacks such as a poor feel after application, such as stickiness, oiliness, and a thick film, but also poor spreadability and compatibility with the skin upon application.

[0004] Therefore, attempts have been actively made to provide excellent moisturizing effects by using specific moisturizing ingredients without blending oils (see, for example, Patent Documents 2 to 5). However, although these attempts can provide a certain degree of moisturizing effect, there are drawbacks such as increased stickiness after application and a poor feel when blended in a large amount to achieve sufficient moisturizing effect. In addition, since the film-like feel of oils is not sufficiently obtained, there are also drawbacks such as the inability to suppress dryness of the skin and the moisturizing effect provided not lasting long. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 07-173043 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-179522 [Patent Document 3] Japanese Patent Application Laid-Open No. 2003-267824 [Patent Document 4] Japanese Patent Application Laid-Open No. 2003-335657 [Patent Document 5] Japanese Patent Application Laid-Open No. 2004-099564 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in view of the above-mentioned prior art, and aims to provide a skin cosmetic that spreads well upon application, blends well with the skin, provides a moderate film-like feel on the skin after application, and provides a good moisturizing effect, while also providing an excellent, non-sticky feel when used. [Means for solving the problem]

[0007] That is, the present invention provides a skin cosmetic composition characterized by containing the following components A, B, C, and D: Component A: Polyhydric alcohol Ingredient B: Polyoxyethylene glycerin Component C: Polyoxyalkylene methyl glucoside Component D: Diethylene glycol monoethyl ether

[0008] The skin cosmetic of the present invention preferably further contains the following component E. Component E: Thickening polymer

[0009] The skin cosmetic of the present invention preferably further contains the following component F. Ingredient F: PPG-6 (PEG / PPG-8 / 5) glycerin [Effects of the Invention]

[0010] By satisfying the above-mentioned constituent requirements, the skin cosmetic of the present invention exhibits remarkably excellent effects in terms of spreading on the skin upon application (so-called spreadability) and compatibility with the skin. Furthermore, when the skin cosmetic of the present invention is applied to the skin, the skin has an appropriate film-like feel, providing a moist and hydrating moisturizing effect, while also providing a non-sticky and smooth feel, thereby achieving an excellent effect in terms of feel when used. DETAILED DESCRIPTION OF THE INVENTION

[0011] The skin cosmetic of the present invention contains the following component A, component B, component C, and component D. Component A: Polyhydric alcohol Ingredient B: Polyoxyethylene glycerin Component C: Polyoxyalkylene methyl glucoside Component D: Diethylene glycol monoethyl ether

[0012] Each component used in the skin cosmetic of the present invention will be described in detail below.

[0013] [Component A] The component A is a polyhydric alcohol. In the present invention, by using the component A, it is possible to impart an excellent moisturizing effect to the skin after application. Examples of the component A that can be used include glycols, glycerins, and sugar alcohols.

[0014] Specific examples of the glycols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, 1,3-butylene glycol, 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, and 1,2-decanediol. Specific examples of the glycerin compounds include glycerin, concentrated glycerin, diglycerin, and polyglycerin. Specific examples of the sugar alcohols include sorbitol, maltitol, mannitol, xylitol, and trehalose. One type of component A may be used alone, or two or more types may be used in appropriate combination.

[0015] Commercially available products can be used as the above-mentioned component A. The commercially available product of component A may be a single raw material or a mixed raw material with other components, and is not particularly limited as long as the desired effect is exhibited.

[0016] The content of Component A in the skin cosmetic of the present invention is not particularly limited as long as the desired effect is sufficiently exhibited, but from the viewpoint of imparting an optimal moisturizing effect and suppressing stickiness after application, it is usually preferably 5 to 20 mass% and more preferably 10 to 15 mass% relative to 100 mass% of the cosmetic. Note that the content of Component A above is the amount converted into a pure content.

[0017] [Component B] Component B is polyoxyethylene glycerin. Polyoxyethylene glycerin is a component obtained by addition polymerization of ethylene oxide to glycerin. In the present invention, by using component B, the product can be well absorbed into the skin upon application and can exhibit an excellent feel when used.

[0018] The average number of moles of ethylene oxide addition polymerized to this component is not particularly limited as long as the desired effect is sufficiently exhibited, but is preferably 10 to 30. Component B may be used alone or in appropriate combination of two or more types.

[0019] A commercially available product can be used as the above-mentioned component B. The commercially available product of component B may be a single raw material or a mixed raw material with other components, and is not particularly limited as long as the desired effect is exhibited.

[0020] The content of component B in the skin cosmetic of the present invention is not particularly limited as long as the desired effect is sufficiently exhibited, but from the viewpoint of achieving good compatibility with the skin upon application, it is usually preferably 0.1 to 5 mass % and more preferably 0.5 to 3 mass % relative to 100 mass % of the cosmetic. Note that the content of component B is the amount converted to a pure content.

[0021] [Component C] Component C is a polyoxyalkylene methyl glucoside. Polyoxyalkylene methyl glucoside is a component obtained by addition polymerization of methyl glucoside with alkylene oxide. By using component C in the present invention, it is possible to impart a suitable film-like feel to the skin to which the skin cosmetic composition is applied, and to exert a moist and hydrating moisturizing effect.

[0022] Specific examples of the component C include polyoxyethylene methyl glucoside and polyoxypropylene methyl glucoside. The average number of moles of alkylene oxide added to the component is not particularly limited as long as the desired effect is sufficiently exhibited, but is preferably 10 to 25. The component C may be used alone or in appropriate combination of two or more.

[0023] As a suitable component C, it is preferable to use polyoxyethylene methyl glucoside, from the viewpoint of providing a good film-forming feel and fully exerting a moist and hydrating moisturizing effect, and among these, it is most preferable to use polyoxyethylene methyl glucoside having an average number of added moles of ethylene oxide of 10.

[0024] A commercially available product can be used as the above-mentioned component C. The commercially available product of component C may be a single raw material or a mixed raw material with other components, and is not particularly limited as long as the desired effect is exhibited.

[0025] The content of component C in the skin cosmetic of the present invention is not particularly limited as long as the desired effect is sufficiently exhibited, but from the viewpoint of imparting an appropriate film-like feel to the applied skin and exhibiting a moist and hydrated moisturizing effect, it is generally preferably 0.5 to 5 mass %, more preferably 1 to 3 mass %, based on 100 mass % of the cosmetic. Note that the content of component C above is the amount converted to a pure content.

[0026] [Component D] Component D is diethylene glycol monoethyl ether. Diethylene glycol monoethyl ether is a component consisting of the monoethyl ether of diethylene glycol. By using component D in the present invention, stickiness on the skin after application can be reduced and a smooth feel can be imparted.

[0027] A commercially available product can be used as the above-mentioned component D. The commercially available product of component D is not particularly limited, and may be a single raw material or a mixed raw material with other components, as long as the desired effect is exhibited.

[0028] The content of component D in the skin cosmetic of the present invention is not particularly limited as long as the desired effect is sufficiently exhibited, but from the viewpoint of suppressing stickiness on the skin after application and imparting a dry feel to the skin, it is usually preferably 0.3 to 3 mass %, more preferably 1 to 2 mass %, based on 100 mass % of the cosmetic. Note that the content of component D above is the amount converted to a pure content.

[0029] [Component E] The skin cosmetic of the present invention preferably further contains a thickening polymer as component E. By using component E, dripping during application can be suppressed, further improving spreadability, and the film-like feel after application can be further improved.

[0030] Examples of the component E include water-soluble natural thickening polymers, semi-synthetic thickening polymers, synthetic thickening polymers, etc. The component E may be used alone or in appropriate combination of two or more.

[0031] Specific examples of natural thickening polymers include gum arabic, tragacanth gum, guar gum, xanthan gum, gellan gum, locust bean gum, karaya gum, iris moss, quince seed, gelatin, shellac, rosin, casein, etc. These components may be used alone or in appropriate combination of two or more.

[0032] Specific examples of semi-synthetic thickening polymers include sodium carboxymethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, methylcellulose, ethylcellulose, sodium alginate, ester gum, nitrocellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, crystalline cellulose, etc. These components may be used alone or in appropriate combination of two or more.

[0033] Specific examples of synthetic thickening polymers include carboxyvinyl polymers, (acrylates / C10-30 alkyl acrylate) crosspolymers, acrylic acid / polyoxyethylene alkyl itaconic acid copolymers, alkyl acrylate / polyoxyethylene alkyl ether methacrylate copolymers, acrylic acid / hydroxyalkyl acrylate copolymers, acrylic acid / polyoxyethylene alkyl ether methacrylate crosspolymers, acrylic acid / vinyl neodecanoate crosspolymers, sodium polyacrylate, polyvinyl alcohol, polyvinyl methyl cellulose, polyamide resins, etc. These components may be used alone or in appropriate combination of two or more.

[0034] As a suitable component E, from the viewpoints of suppressing dripping during application and further enhancing spreadability, and from the viewpoints of further improving the film feel after application, it is preferable to use at least one selected from the group consisting of natural thickening polymers and synthetic thickening polymers, and among these, it is more preferable to use at least one selected from xanthan gum, carboxyvinyl polymer, and (acrylates / C10-30 alkyl acrylate) crosspolymer.

[0035] Commercially available products can be used as the above-mentioned component E. The commercially available product of component E is not particularly limited, and may be a single raw material or a mixed raw material with other components, as long as the desired effect is exhibited.

[0036] The content of component E in the skin cosmetic of the present invention is not particularly limited as long as the desired effect is sufficiently exhibited, but from the viewpoint of suppressing dripping during application and further enhancing spreadability, and from the viewpoint of further improving the film-forming feel after application, it is usually preferably 0.05 to 0.5 mass% and more preferably 0.1 to 0.3 mass% relative to 100 mass% of the cosmetic. Note that the content of component E above is the amount converted into a pure content.

[0037] [Component F] The skin cosmetic of the present invention preferably further contains PPG-6 (PEG / PPG-8 / 5) glycerin as component F. By using component F, it is possible to further improve skin compatibility when spreading, and to further enhance the moisturizing effect on the skin after application.

[0038] PPG-6 (PEG / PPG-8 / 5) glycerin is a polyoxyethylene, polyoxypropylene ether of glycerin, obtained by first reacting 8 moles of ethylene oxide with 5 moles of propylene oxide, and then further reacting with 6 moles of propylene oxide. It is a compound known by the INCI name "PPG-6 PEG / PPG-8 / 5 Glycerin."

[0039] A commercially available product can be used as the above-mentioned component F. The commercially available product of component F is not particularly limited, and may be a single raw material or a mixed raw material with other components, as long as the desired effect is exhibited.

[0040] The content of component F in the skin cosmetic of the present invention is not particularly limited as long as the desired effect is sufficiently exhibited, but from the viewpoint of further improving skin compatibility when spread and further enhancing the moisturizing effect on the skin after application, it is usually preferably 0.5 to 5 mass %, and more preferably 1 to 3 mass %, based on 100 mass % of the cosmetic. Note that the content of component F above is the amount converted to a pure content.

[0041] The skin cosmetic composition of the present invention may further contain persimmon tannin, which is the main component of persimmon tannin contained in the fruit of the persimmon tree (scientific name: Diospyros kaki Thunb), a plant of the Ebenaceae family, in order to further enhance the moisturizing effect on the skin after application.

[0042] The persimmon tannin may be a commercially available product, and is not particularly limited as long as it exhibits the desired effect, whether it is a single ingredient or a mixed ingredient with other ingredients.

[0043] The content of persimmon tannin in the skin cosmetic of the present invention is not particularly limited as long as the desired effect is sufficiently exhibited, but from the viewpoint of further enhancing the moisturizing effect on the skin after application, it is usually preferably 0.00000005 to 0.15 mass% and more preferably 0.002 to 0.07 mass% based on 100 mass% of the cosmetic. Note that the above content is the amount converted to pure content.

[0044] [Other ingredients] In addition to the above-mentioned components, the skin cosmetic composition of the present invention may contain various surfactants, higher alcohols, lower alcohols, cooling agents, fragrances, powders, colorants, antioxidants, preservatives, UV absorbers, inorganic pigments, pearlizing agents, vitamins, animal and plant extracts, sequestering agents, and the like, depending on the purpose and application, as long as the effects of the present invention are not impaired. The above-mentioned other components may be used alone or in appropriate combinations of two or more. The above-mentioned other components exclude those included in Component A, Component B, Component C, Component D, Component E, Component F, and Component G.

[0045] The balance of the skin cosmetic of the present invention is water. The water used is not particularly limited as long as it can be used as a cosmetic raw material, but purified water is usually used. The content of water is not particularly limited and can be adjusted appropriately depending on the content of other ingredients.

[0046] The form of the skin cosmetic of the present invention is not particularly limited, but examples include liquid (lotion type), gel, emulsion, cream, etc. Among these, from the viewpoint of fully exerting the desired effects, liquid (lotion type) and gel are preferred.

[0047] The method for producing the skin cosmetic of the present invention is not particularly limited, but it can be produced by, for example, a known method. Specifically, for example, the above-mentioned components are mixed and stirred using, for example, a paddle mixer, a disperser mixer, etc., but the present invention is not limited to only these production methods.

[0048] The use of the skin cosmetic of the present invention is not particularly limited, but it is preferably used, for example, as a moisturizing cosmetic, a whitening cosmetic, an acne care cosmetic, or an anti-aging cosmetic intended to inhibit wrinkles and sagging, etc. The skin cosmetic of the present invention may be any of cosmetics, quasi-drugs, designated quasi-drugs, pharmaceuticals, and miscellaneous goods.

[0049] The area to which the skin cosmetic of the present invention is applied is not particularly limited, but can be used on the skin of, for example, the face (e.g., forehead, eyes, corners of the eyes, cheeks, mouth, etc.), arms, elbows, backs of the hands, fingertips, feet, knees, heels, neck, décolleté, armpits, back, etc. Among these, it is preferable to use the cosmetic of the present invention on the face, neck, and décolleté, where the significantly superior effects of the present invention can be felt. [Example]

[0050] 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 blending amounts are expressed in "% by mass," and the blending amounts of all components in the tables are values ​​converted to pure contents. Furthermore, all evaluations were carried out at a constant temperature (25±2°C).

[0051] (Sample preparation) Skin cosmetics of Examples 1 to 8 and Comparative Examples 1 to 8 were prepared in accordance with standard methods using the compositions shown in Tables 1 and 2, and were subjected to the following evaluation tests. The results are also shown in Tables 1 and 2, respectively.

[0052] (Test Example 1: Evaluation at the time of application) Each sample obtained in the Examples and Comparative Examples was filled into a 180 g hinge-cap bottle. Next, in a use test in which 1 g of the sample was actually applied to the face, a sensory evaluation was conducted on the "spreadability" and "skin compatibility" upon application, and scores were assigned according to the following evaluation criteria of 1 to 5. The evaluation was carried out by five expert evaluators, and the average score of each evaluator was used to determine the rating.

[0053] The evaluation criteria for "spreadability" upon application were the better the spreadability, the higher the score. The evaluation criteria for "skin compatibility" were the better the feeling of penetration into the skin, the higher the score.

[0054] <Evaluation criteria> 5 points: very good 4 points: Good 3 points: normal 2 points: Defective 1 point: Very poor

[0055] <Judgment criteria> ◎:Average 4.0 or more ○: Average 3.0 or more and less than 4.0 △: Average 2.0 or more and less than 3.0 ×: Average less than 2.0

[0056] (Test Example 2: Evaluation after application) Regarding the skin condition after the evaluation of Test Example 1, a sensory evaluation was conducted from the viewpoints of "film-like feel," "moisturizing effect," and "stickiness," and scores were assigned according to the following evaluation points of 1 to 5. The evaluation was carried out by five expert evaluators, and the average score of each evaluator was used to determine the evaluation result according to the following criteria.

[0057] The evaluation criteria for "film-like feel" were a moderate film-like feel and the stronger the feeling that the cosmetic was on the skin, the higher the score. The evaluation criteria for "moisturizing effect" were a higher score, the more moisturizing the feel was. The evaluation criteria for "stickiness" were a higher score, the more smooth the feel was without stickiness.

[0058] <Evaluation criteria> 5 points: very good 4 points: Good 3 points: normal 2 points: Defective 1 point: Very poor

[0059] <Judgment criteria> ◎:Average 4.0 or more ○: Average 3.0 or more and less than 4.0 △: Average 2.0 or more and less than 3.0 ×: Average less than 2.0

[0060] [Table 1]

[0061] [Table 2]

[0062] The results shown in Table 1 show that the skin cosmetics of the present invention obtained in each example exhibited significantly superior effects in all of the evaluation items of "spreadability," "skin compatibility," "film-like feel," "moisturizing effect," and "stickiness (non-stickiness)" compared to those obtained in each comparative example.

[0063] In contrast, the comparative examples that did not contain the essential components of the present invention did not achieve fully satisfactory results in all evaluation items. From these results, it is clear that the importance of the combination of the essential components of the present invention can be understood, and that it is only by combining these essential components that a skin cosmetic that can fully achieve the effects of the present invention can be obtained.

Claims

1. A skin cosmetic comprising the following components A, B, C, and D: Component A: Polyhydric alcohol Component B: Polyoxyethylene glycerin Component C: Polyoxyalkylene methyl glucoside Component D: Diethylene glycol monoethyl ether

2. 2. The skin cosmetic according to claim 1, further comprising the following component E: Component E: Thickening polymer

3. 3. The skin cosmetic according to claim 1, further comprising the following component F: Component F: PPG-6 (PEG / PPG-8 / 5) glycerin

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