Sunscreen composition

Abstract

Provided is a sunscreen composition excellent in ultraviolet protection effect and feeling of use. A sunscreen composition according to the present invention comprises: (A) a compound selected from the group consisting of glycyrrhetinic acid and a derivative thereof, and o-cymene-5-ol; and (B) an ultraviolet protective agent.

Description

Sunscreen composition

[0001] The present invention relates to a sunscreen composition that is excellent in usability.

[0002] Various sunscreen compositions have been developed to minimize the adverse effects of ultraviolet rays on the skin. Generally, sunscreen compositions contain ultraviolet absorbers and ultraviolet scattering agents, which block UVA and UVB rays from reaching the skin, thereby achieving ultraviolet protection.

[0003] Therefore, in order to enhance the UV protection effect, it is common to increase the content of UV absorbers or UV scattering agents. However, since UV absorbers are often oily compounds, increasing the amount tends to make the skin sticky, and since UV scattering agents are often inorganic powders, increasing the amount tends to make the skin feel powdery during use. Therefore, when the UV protection effect is enhanced, the feeling during use tends to deteriorate, so a sunscreen composition that is excellent in both UV protection effect and feeling during use has been desired. From this perspective, various sunscreen compositions have been studied, but according to the studies of the present inventors, there is still room for improvement.

[0004] Japanese Patent Application Laid-Open No. 2014-097935

[0005] In view of the above problems, the present invention aims to provide a sunscreen composition that combines a high ultraviolet protection effect with an excellent feeling when used.

[0006] The present invention provides the following inventions. [1] A sunscreen composition comprising (A) a compound selected from the group consisting of glycyrrhetinic acid and its derivatives, and o-cymen-5-ol, and (B) an ultraviolet protection agent. [2] The composition according to [1], wherein component (A) is glycyrrhetinic acid, stearyl glycyrrhetinate, or o-cymen-5-ol. [3] The composition according to [1] or [2], wherein component (B) comprises an ultraviolet absorber. [4] The composition according to any one of [1] to [3], wherein, based on the total mass of the composition, the content of component (A) is 0.005 to 1 mass %, and the content of component (B) is 0.5 to 40 mass %. [5] The composition according to any one of [1] to [4], wherein the ratio B / A of the content of component (B) to the content of component (A) is 0.5 to 8,000. [6] The composition according to any one of [1] to [5], further comprising (C) water. [7] The composition according to any one of [1] to [6], further comprising (D) a moisturizing agent. [8] The composition according to any one of [1] to [7], further comprising (E) a silicone surfactant. [9] The composition according to any one of [1] to [8], further comprising (F) a lower alcohol.

[10] The composition according to any one of [1] to [9], further comprising (G) a thickener.

[11] The composition according to any one of [1] to

[10] , which is a water-in-oil composition.

[12] The composition according to any one of [1] to

[10] , which is an oil-based composition.

[0007] The present invention provides a sunscreen composition that has excellent UV protection effects and a pleasant feel when used. This composition also exhibits bactericidal and antiperspirant effects, making it suitable for use not only as a sunscreen cosmetic but also as a skin care cosmetic that is excellent for antiperspirant purposes. Specific Description of the Invention

[0008] The cleansing agent according to the present invention comprises: (A) a compound selected from the group consisting of glycyrrhetinic acid and its derivatives, and o-cymen-5-ol, and (B) an ultraviolet protection agent. Each of these components, as well as other components that may be added, will be described below.

[0009] (A) A compound selected from the group consisting of glycyrrhetinic acid and its derivatives, and o-cymen-5-ol The composition according to the present invention comprises a compound (hereinafter sometimes referred to as component (A)) selected from the group consisting of glycyrrhetinic acid and its derivatives, and o-cymen-5-ol. These compounds are used in the cosmetic field as antibacterial agents and disinfectants, and are often used to suppress odors caused by sweat, etc.

[0010] Through investigations into these conventional uses, the present inventors have discovered that combining component (A) with a UV protection agent provides the unexpected effect of significantly enhancing the UV protection effect, an effect that cannot be obtained with other known antibacterial agents.

[0011] One of the components (A) is glycyrrhetinic acid and its derivatives. Glycyrrhetinic acid is represented by the following formula (a-1):

[0012] Furthermore, a derivative of glycyrrhetinic acid can also be used as component (A). Such derivatives include esters of glycyrrhetinic acid and higher alcohols. Specific examples of higher alcohols include fatty alcohols having 10 to 20 carbon atoms. More specific examples of glycyrrhetinic acid derivatives include stearyl glycyrrhetinate represented by the following formula (a-1-1):

[0013] Another example of component (A) is o-cymen-5-ol, which is also known as isopropylmethylphenol and is represented by the following formula (a-2):

[0014] Component (A) is selected from the group consisting of glycyrrhetinic acid and its derivatives, and o-cymen-5-ol, as explained above, and particularly excellent effects can be obtained when glycyrrhetinic acid, stearyl glycyrrhetinate, or o-cymen-5-ol is selected.

[0015] The content of component (A) can be selected arbitrarily depending on the purpose, but in order to achieve a sufficient improvement in the UV protection effect, it is preferably 0.005 to 1 mass % based on the total mass of the cleanser, and more preferably 0.01 to 0.3 mass %.

[0016] (B) UV Protection Agent The composition according to the present invention contains a UV protection agent (hereinafter, sometimes referred to as component (B)). Component (B) has the effect of blocking UVA and UVB rays from reaching the skin. UV protection agents having such an effect can be broadly classified into UV absorbers, which absorb UV rays before they reach the skin, and UV scattering agents, which optically reflect or scatter UV rays to prevent them from reaching the skin.

[0017] The ultraviolet absorber can be arbitrarily selected from those used in general suncare cosmetics, etc. Ultraviolet absorbers can be classified into oil-soluble ultraviolet absorbers and water-soluble or water-dispersible ultraviolet absorbers, and in the present invention, oil-soluble ultraviolet absorbers are preferably used.

[0018] Examples of the oil-soluble ultraviolet absorber include cinnamic acid derivatives, benzoic acid derivatives, salicylic acid derivatives, dibenzoylmethane derivatives, β,β-diphenylacrylate derivatives, benzophenone derivatives, benzylidene camphor derivatives, phenylbenzimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, anthranil derivatives, imidazoline derivatives, benzalmalonate derivatives, 4,4-diarylbutadiene derivatives, and silicone derivatives.

[0019] More specifically, cinnamic acid derivatives such as ethylhexyl methoxycinnamate, salicylic acid derivatives such as octyl salicylate and homomenthyl salicylate (homosalate), benzoic acid derivatives such as diethylaminohydroxybenzoylhexylbenzoate, triazine derivatives such as ethylhexyl triazone, bisethylhexyloxyphenol methoxyphenyl triazine and 2,4,6-trianilino-p-(carbo-2'-ethylhexyl-1'-oxy)-1,3,5-triazine, dibenzoylmethane derivatives such as t-butylmethoxydibenzoylmethane, β,β-diphenylacrylate derivatives such as octocrylene, benzophenone derivatives such as 2-hydroxy-4-methoxybenzophenone, 2,4,6-trianilino-p-(carbo-2'-ethylhexyl-1'-oxy)-1,3,5-triazine, and the like are preferably used.

[0020] The cosmetic composition of the present invention may also contain a water-soluble or water-dispersible ultraviolet absorber. Two or more of these ultraviolet absorbers may be used in combination.

[0021] The ultraviolet scattering agent can also be selected from those commonly used in suncare cosmetics, etc. Specific examples include fine particle metal oxides such as zinc oxide, titanium oxide, iron oxide, cerium oxide, and tungsten oxide.

[0022] The ultraviolet scattering agent may be untreated or may be subjected to various hydrophobic surface treatments. Examples of surface treatment agents that can be used include those commonly used in the field of cosmetics, such as silicones such as dimethicone and alkyl-modified silicone, alkoxysilanes such as octyltriethoxysilane, dextrin fatty acid esters such as dextrin palmitate, and fatty acids such as stearic acid.

[0023] In the present invention, either an ultraviolet absorber or an ultraviolet scattering agent can be used as component (B), but it is preferable to use an ultraviolet absorber, and it is more preferable to use a combination of an ultraviolet absorber and an ultraviolet scattering agent. By using a combination of an ultraviolet absorber and an ultraviolet scattering agent, the content of each can be reduced compared to when they are used alone, and therefore stickiness and powdery feeling that occur when the content of each is excessive can be suppressed.

[0024] The content of component (B) can be selected arbitrarily depending on the purpose, but in order to achieve a sufficient improvement in the UV protection effect, it is preferably 0.5 to 40 mass % based on the total mass of the cleanser, and more preferably 5 to 30 mass %.

[0025] Furthermore, in the present invention, the combination of component (A) and component (B) produces unexpected effects. The details of the mechanism by which the combination of component (A) and component (B) enhances the UV protection effect are unknown, but the effect may vary depending on the ratio of the content of component (A) to the content of component (B). To further enhance the effects of the present invention, the ratio B / A of the content of component (B) to the content of component (A) is preferably 0.5 to 8,000, more preferably 10 to 800, and particularly preferably 20 to 400.

[0026] (C) Water The composition according to the present invention may contain water as needed. As the water, water generally used in cosmetics and pharmaceuticals, such as purified water, ion-exchanged water, tap water, etc., may be used.

[0027] (D) Moisturizer The composition according to the present invention is suitable for use in sun care or skin care applications, and may further contain a moisturizer. Moisturizers commonly used in cosmetics and pharmaceuticals can be used, but polyhydric alcohols and low-molecular-weight betaine compounds can also be used. Examples of polyhydric alcohols that can be used include dihydric alcohols such as ethylene glycol, propylene glycol, and 1,3-butylene glycol, trihydric alcohols such as glycerin, and tetrahydric or higher alcohols. Specifically, low-molecular-weight betaine compounds that form zwitterions with an inner salt of a quaternary ammonium base, sulfonium base, phosphonium base, or the like, with a molecular weight of 200 or less can be used. Care should be taken when using a low-molecular-weight betaine compound, as excessively high molecular weights can cause rough skin.

[0028] When a polyhydric alcohol is used as a moisturizing agent, it is preferable to use glycerin, and it is also preferable to further combine glycerin with at least one selected from the group consisting of polyethylene glycol, 1,3-butylene glycol, and dipropylene glycol.

[0029] (E) Silicone Surfactant When the composition according to the present invention is made into an emulsion-type or dispersion-type composition, it may further contain a silicone surfactant. The silicone surfactant is not particularly limited, but examples thereof include silicone surfactants modified with a polyether group or a polyglycerin group, and among these, silicones modified with a polyether group, i.e., polyether-modified silicones, are preferred.

[0030] Various polyether-based silicones are known, and any one that can be used in cosmetics can be selected and used. The molecular weight of such polyether-modified silicones is not necessarily limited, but polyether-modified silicones with a mass average molecular weight of 30,000 or more are preferred.

[0031] Other examples of polyether-modified silicones that can be used include poly(oxyethylene-oxypropylene) methylpolysiloxane copolymers, polyoxyethylene methylpolysiloxane copolymers, silicone chain-branched methylpolysiloxane copolymers, alkyl chain-branched polyoxyethylene methylpolysiloxane copolymers, alkyl chain-silicone chain-branched polyoxyethylene methylpolysiloxane copolymers, crosslinked polyoxyethylene methylpolysiloxanes, and alkyl group-containing crosslinked polyoxyethylene methylpolysiloxanes.

[0032] Furthermore, as the polyglycerin-modified silicone modified with a polyglycerin group, branched polyglycerin-modified silicone, cross-linked polyglycerin-modified silicone, alkyl group-containing cross-linked polyglycerin-modified silicone, alkyl group-branched polyglycerin-modified silicone, etc. can also be used.

[0033] More specific examples include PEG-9 polydimethylsiloxyethyl dimethicone, lauryl PEG-9 polydimethylsiloxyethyl dimethicone, cetyl PEG / PPG-10 / 1 dimethicone, PEG-9 methyl ether dimethicone, PEG-10 dimethicone, PEG-3 dimethicone, and the like, but are not limited to these.

[0034] (F) Lower Alcohol The composition according to the present invention may further contain a lower alcohol. In the present invention, a lower alcohol refers to an alcohol having 6 or fewer carbon atoms, such as ethanol or propanol. These lower alcohols are preferably used because they can provide a refreshing feeling when the composition is applied to the skin.

[0035] (G) Thickener The composition of the present invention may further contain a thickener. The composition of the present invention, which has excellent UV protection effect, is preferably used for sun care applications, and since it is desired that the composition adheres to the skin, it is preferable that the composition has a certain viscosity.

[0036] The thickener can be selected from those commonly used in cosmetics according to the purpose, and examples thereof include clay minerals, dextrin fatty acid esters, sucrose fatty acid esters, fatty acids and their salts.

[0037] More specifically, examples of clay minerals include disteardimonium hectorite, dimethylalkylammonium hectorite, benzyldimethylstearylammonium hectorite, and magnesium aluminum silicate treated with distearyldimethylammonium chloride; examples of dextrin fatty acid esters include dextrin palmitate, dextrin oleate, dextrin stearate, dextrin myristate, and dextrin (palmitate / 2-ethylhexanoate); examples of sucrose fatty acid esters include sucrose caprylate, sucrose caprate, sucrose laurate, sucrose myristate, sucrose palmitate, sucrose stearate, sucrose oleate, and sucrose erucate; and examples of fatty acids or salts thereof include myristic acid, palmitic acid, stearic acid, behenic acid, and calcium salts, magnesium salts, and aluminum salts thereof.

[0038] In addition to the above-mentioned components, the sunscreen composition of the present invention can also contain, as needed, ingredients commonly used in cosmetics, such as whitening agents, antioxidants, surfactants other than those mentioned above, powder components, coloring agents, etc., and can be produced by conventional methods.

[0039] The sunscreen composition according to the present invention may be any of a water-in-oil composition, an oily composition, an oil-in-water composition, or an aqueous composition. However, since it is more preferable to use an oily compound as the UV protection agent, it is preferably a water-in-oil composition or an oily composition. The type of composition to be used can be appropriately determined depending on the purpose and use. The sunscreen composition according to the present invention can be provided not only as a sunscreen cream, sunscreen emulsion, or sunscreen lotion, but also as a foundation, makeup base, makeup cosmetic, hair cosmetic, etc., imparted with sunscreen effect.

[0040] Examples 101 to 102 and Comparative Examples 101 to 103 Water-in-oil sunscreen compositions were prepared by blending the components as shown in Table 1. The physical properties of the resulting compositions were evaluated as follows.

[0041] UV Protection Effect The absorbance at a wavelength of 300 nm of each composition was measured, and the ratio (unit: %) of the absorption intensity to that of a comparative example not containing component (A) was calculated.

[0042]

[0043] There was no significant difference in the sensation of use between Examples 101 and 102 and Comparative Examples 101 to 103. In other words, the cosmetic composition of the present invention can achieve an improved UV protection effect without impairing the sensation of use.

[0044] Examples 201-202 and Comparative Examples 201-203 Water-in-oil sunscreen compositions were prepared by blending the components as shown in Table 2. The resulting compositions were evaluated in the same manner as in Example 101, etc.

[0045]

[0046] There was also no significant difference in the feeling of use between Examples 201 and 202 and Comparative Examples 201 to 203.

[0047] [Examples 301 to 306 and Comparative Example 301] Oil-based sunscreen compositions were prepared by blending the components as shown in Table 3. The resulting compositions were evaluated in the same manner as in Example 101, etc.

[0048]

[0049] Examples 301 to 306 achieved a feel in use that was equal to or better than that of Comparative Example 301, demonstrating that the oil-based sunscreen cosmetic composition of the present invention can also achieve improved UV protection effects without impairing the feel in use.

Claims

1. A sunscreen composition comprising: (A) a compound selected from the group consisting of glycyrrhetinic acid and its derivatives, and o-cymen-5-ol; and (B) an ultraviolet protection agent.

2. The composition according to claim 1, wherein component (A) is glycyrrhetinic acid, stearyl glycyrrhetinate, or o-cymen-5-ol.

3. The composition according to claim 1 or 2, wherein component (B) comprises an ultraviolet absorber.

4. The composition according to claim 1 or 2, wherein the content of component (A) is 0.005 to 1 mass %, and the content of component (B) is 0.5 to 40 mass %, based on the total mass of the composition.

5. The composition according to claim 1 or 2, wherein the ratio B / A of the content of the component (B) to the content of the component (A) is 0.5 to 8,000.

6. The composition according to claim 1 or 2, further comprising (C) water.

7. The composition according to claim 1 or 2, further comprising (D) a moisturizer.

8. The composition according to claim 1 or 2, further comprising (E) a silicone surfactant.

9. The composition according to claim 1 or 2, further comprising (F) a lower alcohol.

10. The composition of claim 1 or 2, further comprising (G) a thickening agent.

11. The composition according to claim 1 or 2, which is a water-in-oil composition.

12. The composition according to claim 1 or 2, which is an oil-based composition.

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