Water-in-oil sunscreen cosmetics

Abstract

To provide a water-in-oil sunscreen cosmetic that has a UV protection effect while suppressing the amount of UV scattering agent added, does not easily come off even when sweating, and can suppress uneven application of the cosmetic.SOLUTION: A water-in-oil sunscreen cosmetic contains: (A) 0.5 to 10 mass% of an alkylene oxide derivative represented by formula (1); (B) 5 to 35 mass% of a UV scattering agent; (C) 0.1 to 5 mass% of dextrin fatty acid ester or sucrose fatty acid ester; and (D) 0.1 to 5 mass% of cationic modified clay mineral (in formula (1), AO represents an oxyalkylene group having 3 to 4 carbon atoms; EO represents an oxyethylene group; a represents the number of moles of AO added; b represents the number of moles of EO added; a represents a number from 0 to 50; b represents a number from 1 to 50; a+b≥10; and 0≤a / b≤2 ).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a water-in-oil sunscreen cosmetic. [Background technology]

[0002] Protecting skin from UV damage is an important issue in skin and body care, and a variety of sunscreen cosmetics have been developed. Sunscreen cosmetics contain UV absorbers and UV scattering agents that provide UV protection. However, when UV scattering agents are used in large amounts to achieve a high level of sunscreen effectiveness, problems arise such as a rough feeling and a white cast after application. To achieve a comfortable feel and texture and good UV protection, it is necessary to reduce the amount of UV scattering agents used.

[0003] Water-in-oil cosmetics have the advantage that the continuous phase is oil, so they are less likely to produce the squeaky feeling that is inherent to UV scattering agents, and are also excellent in water resistance.

[0004] For example, Patent Document 1 proposes an oil-in-water or water-in-oil sunscreen cosmetic that contains an ultraviolet absorber, an ultraviolet scattering agent, isodecyl neopentanoate, and silicone oil, and thereby has excellent ultraviolet protection effect as well as ease of use, stability, and cleansing properties.

[0005] In addition, sunscreen cosmetics are often used as a base before applying makeup. In particular, when a water-in-oil sunscreen cosmetic is applied before applying makeup cosmetics such as foundation, which often contain oil-absorbing powder, the oil in the sunscreen cosmetic is absorbed, which can result in uneven application of the applied film.

[0006] Patent Document 2 proposes a water-in-oil emulsion cosmetic that combines a vinyl polymer having a carbosiloxane dendrimer structure in the side chain, hydrophobized powder, and pentaerythritol fatty acid ester, which allows foundation to adhere cleanly. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-222349 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-160191 Summary of the Invention [Problem to be solved by the invention]

[0008] Patent Document 1 proposes a water-in-oil sunscreen cosmetic that is excellent in usability, stability, etc. However, water-in-oil cosmetics tend to be sticky due to the oily feel when used. Furthermore, when sweating in the summer, the sweat contains water and salt, which causes re-emulsification, which can cause the applied film to break down (the cosmetic to come off). Furthermore, the water-in-oil sunscreen cosmetic proposed in Patent Document 1 was insufficient in terms of its ability to stay on when sweating and its ability to improve UV protection effect.

[0009] Furthermore, Patent Document 2 proposes a water-in-oil emulsion cosmetic that adheres foundation beautifully when used as a base before makeup application, and claims that this water-in-oil emulsion cosmetic can be used as a UV protection cosmetic, etc. However, the water-in-oil emulsion cosmetic proposed in Patent Document 2 is insufficient in terms of its ability to stay on when sweating.

[0010] In view of the above problems, the present invention aims to provide a water-in-oil sunscreen cosmetic that has an enhanced UV protection effect while reducing the amount of UV scattering agent blended by using an SPF-improving component, is resistant to smearing when sweating, and can prevent uneven application of makeup cosmetics such as foundation. [Means for solving the problem]

[0011] As a result of intensive research conducted in light of the above-mentioned problems, the present inventors have discovered that a water-in-oil sunscreen cosmetic that can solve the above-mentioned problems can be obtained by combining an ultraviolet light scattering agent, a dextrin or sucrose fatty acid ester, a cation-modified clay mineral, and an alkylene oxide derivative having a specific structure in specified blending amounts, and have thus completed the present invention.

[0012] That is, the present invention relates to a water-in-oil sunscreen cosmetic composition containing 0.5 to 10 mass% of the following component (A), 5 to 35 mass% of component (B), 0.1 to 5 mass% of component (C), and 0.1 to 5 mass% of component (D): (A) An alkylene oxide derivative represented by the following formula (1):

[0013] [ka]

[0014] In formula (1), AO represents an oxyalkylene group having 3 to 4 carbon atoms, EO represents an oxyethylene group, a represents the number of moles of the oxyalkylene group having 3 to 4 carbon atoms added, b represents the number of moles of the oxyethylene group added, a represents a number from 0 to 50, b represents a number from 1 to 50, a+b≧10, and 0≦a / b≦2. When the alkylene oxide derivative represented by formula (1) has both the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group, the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group are added in a random or block manner, and in the case of block addition, the order of arrangement does not matter. (B) UV scattering agent (C) Dextrin fatty acid ester or sucrose fatty acid ester (D) Cation-modified clay minerals [Effects of the Invention]

[0015] The water-in-oil sunscreen cosmetic of the present invention enhances the UV protection effect while reducing the amount of UV scattering agent blended due to the SPF-enhancing component, is resistant to smearing when sweating, and can prevent uneven application of makeup cosmetics such as foundation. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described. In this specification, a numerical range defined using the symbol "to" is intended to include the numerical values ​​on both ends (upper and lower limits) of the symbol "to." For example, "2 to 5" means 2 or more and 5 or less.

[0017] The sunscreen cosmetic of the present invention contains at least component (A), component (B), component (C) and component (D). Each component will be explained below.

[0018] [Component (A)] Component (A) is an alkylene oxide derivative represented by formula (1).

[0019] [ka]

[0020] In formula (1), AO represents an oxyalkylene group having 3 to 4 carbon atoms, EO represents an oxyethylene group, a represents the number of moles of the oxyalkylene group having 3 to 4 carbon atoms added, b represents the number of moles of the oxyethylene group EO added, a represents a number from 0 to 50, b represents a number from 1 to 50, a+b≧10, and 0≦a / b≦2. The oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group are added in a random or block manner, and in the case of block addition, the order of arrangement does not matter.

[0021] By setting a to 50 or less, it is possible to improve the SPF improvement effect and the resistance to removal when sweating, and to reduce stickiness. Therefore, a is set to 0 to 50, preferably 0 to 40, and most preferably 0 to 30.

[0022] By making b 1 or more, the SPF is improved and the effect of preventing uneven makeup application is improved. Also, by making b 50 or less, it is possible to improve the resistance to removal when sweating. Therefore, b is set to 1 to 50, preferably 10 to 40, and more preferably 10 to 30.

[0023] By making a+b 10 or more, the effect of preventing uneven makeup application can be improved. Therefore, a+b is set to 10 or more, and most preferably 20 or more. There is no particular upper limit for a+b, but from the viewpoint of improving the SPF improvement effect, it is preferably set to 50 or less.

[0024] When a is greater than 0, the oxyalkylene groups and oxyethylene groups having 3 to 4 carbon atoms are added randomly or in a block form. When added in a block form, the order of arrangement is not important. When a is greater than 0, the oxyalkylene groups and oxyethylene groups having 3 to 4 carbon atoms are preferably added randomly.

[0025] By setting the a / b ratio to 2 or less, stickiness can be reduced, the SPF effect can be improved, and makeup can be made to last longer when sweating, preventing uneven application of makeup. Therefore, the a / b ratio should be 2 or less, with 1.2 or less being most preferable. The lower limit of the a / b ratio is 0, but it can also be 0.3 or more.

[0026] Examples of the oxyalkylene group having 3 to 4 carbon atoms include an oxypropylene group and an oxybutylene group, with an oxypropylene group being the most preferred. The alkylene oxide derivative represented by formula (1) may have either an oxypropylene group or an oxybutylene group, or both. When both are present, the oxypropylene group and the oxybutylene group may be in either a random or block form. When added in a block form, the order of arrangement is not important.

[0027] The alkylene oxide derivative represented by formula (1) has a monoether structure in which an alkylene oxide is added to the first hydroxyl group among the three hydroxyl groups of glycerin. The monoether purity is 80% or more, preferably 90% or more, and more preferably 95% or more. The upper limit of the monoether purity is not particularly limited, but can be 100% or less.

[0028] Monoether purity is 1 It can be calculated from the following formula using the peak integral value obtained by H-NMR measurement.

[0029]

number

[0030] X represents the integral value of the peak at approximately 2.4 ppm, which is derived from the methylene groups at the 1- and 3-positions of glycerin to which ethylene oxide has been added, when the integral value of the peak at approximately 3.3 ppm, which is derived from the methine group at the 2-position of glycerin and which is detected only in the monoether, is set to 1. However, if the integral value of the peak at approximately 3.3 ppm, which is derived from the methine group at the 2-position of glycerin in the monoether, cannot be detected, the purity of the monoether is set to 0.

[0031] The alkylene oxide derivative of the present invention represented by formula (1) can be produced by known methods. An alkylene oxide is addition-polymerized with an alkyl alcohol, for example, isopropylidene glycol in which all but the primary hydroxyl group of glycerin have been protected, in the presence of an alkali catalyst at 50 to 160°C and 0.5 MPa (gauge pressure) or less. When using two or more alkylene oxides, in the case of a random alkylene oxide, the two or more alkylene oxides are mixed together before addition polymerization. In the case of a block alkylene oxide, AO may be polymerized first, followed by EO, or EO may be polymerized first, followed by AO. Subsequently, an acid such as hydrochloric acid, phosphoric acid, or acetic acid is added to deacetalize the mixture. The excess acid is neutralized with a base such as potassium hydroxide or sodium hydroxide, and the water and neutralization salt are then removed to obtain the alkylene oxide derivative.

[0032] The concentration of component (A) added is 0.5 to 10% by mass, preferably 1 to 8% by mass, and more preferably 1.5 to 5% by mass, based on the total mass of the water-in-oil sunscreen cosmetic. Increasing the content of component (A) improves the SPF effect, improves resistance to removal when sweating, and reduces uneven makeup application. By not including an excessive amount of component (A), it is possible to prevent a decrease in the effect of reducing uneven makeup application and prevent stickiness.

[0033] [Component (B)] Component (B) is an ultraviolet scattering agent. An ultraviolet scattering agent refers to a particulate substance that can reflect and scatter ultraviolet rays to protect the skin and the like from ultraviolet rays. Examples of ultraviolet scattering agent materials that can be used in the present invention include titanium oxide, zinc oxide, iron oxide, zirconium oxide, and aluminum oxide. Furthermore, these materials may be microparticulated or composited to be used as ultraviolet scattering agents. Due to their high ultraviolet reflection and scattering effect, it is preferable to include one or two types selected from titanium oxide and zinc oxide.

[0034] The titanium oxide and zinc oxide used as the UV scattering agent may be titanium oxide and zinc oxide that are commonly used in cosmetics. Preferably, titanium oxide and zinc oxide with better dispersibility, for example, titanium oxide and zinc oxide that have been surface-treated, specifically hydrophobized, by a known method as needed, can be contained in the skin composition.

[0035] Examples of surface treatment methods include silicone treatment with methylhydrogenpolysiloxane, methylpolysiloxane, or the like; fluorine treatment with perfluoroalkyl phosphate ester, perfluoroalcohol, or the like; amino acid treatment with N-acylglutamic acid, or the like; alkylalkoxysilane treatment with octyltriethoxysilane, octyltrimethoxysilane, or the like; lecithin treatment; metal soap treatment; fatty acid treatment; and alkyl phosphate ester treatment.

[0036] Component (B) is preferably microparticulated to an average primary particle size of 8 to 80 nm, more preferably 10 to 30 nm.

[0037] The concentration of component (B) added is 5 to 35% by mass, preferably 10 to 30% by mass, and more preferably 15 to 25% by mass, based on the total mass of the water-in-oil sunscreen cosmetic. By increasing the content of component (B), the sunscreen cosmetic can achieve sufficient UV protection. By not including an excessive amount of component (B), it is possible to prevent uneven application of makeup and suppress deterioration in the feel when used, such as a rough feeling or a white cast.

[0038] [Component (C)] Component (C) is a dextrin fatty acid ester or a sucrose fatty acid ester.

[0039] The dextrin fatty acid ester used in the present invention is an ester of a fatty acid and dextrin. The fatty acid is preferably a linear or branched, saturated or unsaturated fatty acid having 8 to 24 carbon atoms. The average degree of polymerization of the dextrin is preferably 10 to 50, more preferably 20 to 30.

[0040] Specific examples of dextrin fatty acid esters include dextrin palmitate, dextrin stearate, dextrin oleate, dextrin isostearate, dextrin myristate, and dextrin palmitate / 2-ethylhexanoate.

[0041] The sucrose fatty acid ester used in the present invention is an ester of a fatty acid and sucrose. The fatty acid is preferably a linear or branched, saturated or unsaturated fatty acid having 8 to 30 carbon atoms, more preferably 18 to 22 carbon atoms.

[0042] Specific examples of sucrose fatty acid esters include sucrose caprylate, sucrose caprate, sucrose laurate, sucrose myristate, sucrose palmitate, sucrose stearate, and sucrose oleate.

[0043] One or more selected from these can be used as component (C). From the viewpoint of preventing uneven application of makeup, dextrin palmitate is preferred.

[0044] The concentration of component (C) added is 0.1 to 5% by mass, preferably 0.5 to 3% by mass, and more preferably 0.5 to 2% by mass, based on the total mass of the water-in-oil sunscreen cosmetic. Increasing the content of component (C) improves the SPF improvement effect, sufficiently enhances the effects of preventing makeup from coming off when sweating, and preventing uneven makeup application. By not including an excessive amount of component (C), it is possible to reduce the sticky feeling during use, improve the effects of preventing makeup from coming off when sweating, and make it easier to prevent uneven makeup application.

[0045] [Component (D)] Component (D) is a cationically modified clay mineral. Component (D) is preferably a cationically modified clay mineral substituted with a quaternary ammonium ion. Component (D) is not limited as long as it is one commonly used in cosmetics, but is preferably a layered clay mineral such as bentonite, laponite, hectorite, montmorillonite, or magnesium aluminum silicate treated with a quaternary ammonium salt-type cationic surfactant.

[0046] Specific examples of component (D) include dimethyl distearyl ammonium hectorite, dimethyl distearyl ammonium bentonite, benzyl dimethyl stearyl ammonium hectorite, distearyl dimethyl ammonium chloride-treated magnesium aluminum silicate, etc. From the viewpoint of preventing uneven application of makeup, dimethyl distearyl ammonium hectorite is preferred.

[0047] Specific examples of quaternary ammonium salt type cationic surfactants include dodecyltrimethylammonium chloride, myristyltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, myristyldimethylethylammonium chloride, cetyldimethylethylammonium chloride, stearyldimethylethylammonium chloride, behenyldimethylethylammonium chloride, myristyldiethylmethylammonium chloride, cetyldiethylmethylammonium chloride, and stearyldiethylmethylammonium chloride. Examples of the ammonium chloride include ammonium chloride, behenyl diethyl methyl ammonium chloride, benzyl dimethyl myristyl ammonium chloride, benzyl dimethyl cetyl ammonium chloride, benzyl dimethyl stearyl ammonium chloride, benzyl dimethyl behenyl ammonium chloride, benzyl methyl ethyl cetyl ammonium chloride, benzyl methyl ethyl stearyl ammonium chloride, distearyl dimethyl ammonium chloride, dibehenyl dihydroxyethyl ammonium chloride, and the above compounds in which the chloride is replaced with a bromide compound, as well as dipalmityl propyl ethyl ammonium methyl sulfate.

[0048] The concentration of component (D) added is 0.1 to 5%, preferably 0.5 to 3%, and more preferably 1 to 2%, based on the total mass of the water-in-oil sunscreen cosmetic. Increasing the content of component (D) improves the SPF improvement effect and sufficiently reduces the effect of uneven makeup application. By not including an excessive amount of component (D), the SPF improvement effect is improved, the resistance to removal when sweating is sufficiently increased, the effect of preventing uneven makeup application is sufficiently achieved, and the stability of the cosmetic is less likely to decrease.

[0049] [Other ingredients] The sunscreen cosmetic of the present invention typically contains water in addition to the above components (A) to (D). Examples of water include purified water, tap water, industrial water, and deionized water. The concentration of water added to the sunscreen composition of the present invention is typically 5 to 60% by mass, preferably 10 to 55% by mass, and more preferably 15 to 50% by mass, based on the total mass of the water-in-oil sunscreen cosmetic.

[0050] In addition to the above components (A) to (D) and water, the sunscreen cosmetic of the present invention may contain additives used in cosmetics, quasi-drugs, pharmaceuticals, etc., as needed, within the scope of not impairing the object of the present invention.

[0051] Examples of such additives include ultraviolet absorbers and surfactants (excluding component (C)). Examples of ultraviolet absorbers include amyl paradimethylbenzoate, 2-ethylhexyl paradimethylaminobenzoate, ethyl 4-[N,N-di(2-hydroxypropyl)amino]benzoate, hexyl diethylaminohydroxybenzoylbenzoate, 2-ethylhexyl salicylate, 2-ethoxyethyl paramethoxycinnamate, 2-ethylhexyl paramethoxycinnamate, glyceryl di-paramethoxycinnamate mono-2-ethylhexanoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)alinino]-1,3,5-triazine, octocrylene, 4-t-butyl-4'-methoxydibenzoylmethane, dimethicodiethyl benzalmalonate, and bisethylhexyloxyphenol methoxyphenyl triazine. These ultraviolet absorbers can be used alone or in combination as needed.

[0052] The surfactant is preferably one with an HLB of 3 to 7, and examples thereof include PEG-9 polydimethylsiloxyethyl dimethicone, PEG-10 dimethicone, glyceryl oleate, glyceryl isostearate, polyglyceryl-2 oleate, and polyglyceryl-2 stearate.

[0053] When the water-in-oil sunscreen cosmetic of the present invention contains other ingredients, the content of the other ingredients relative to the total mass of the water-in-oil sunscreen cosmetic is preferably 30% by mass or less, and more preferably 0.01% by mass to 20% by mass.

[0054] The water-in-oil sunscreen cosmetic of the present invention is formed by emulsifying an oily component and an aqueous phase component, and can be produced by a commonly used method, for example, by mixing and dissolving an oily component such as an oil agent with component (C), adding components (B) and (D) while stirring, and then adding and emulsifying an aqueous phase component prepared by mixing and dissolving component (A) and the like in water.

[0055] The water-in-oil sunscreen cosmetic of the present invention can be provided in various forms according to the intended use, for example, as a milky lotion, cream, gel, etc. [Example]

[0056] The present invention will be described in detail below with reference to examples and comparative examples.

[0057] [Examples 1 to 11, Comparative Examples 1 to 7] <Synthesis Example 1: Example Compound A-1> 100 g of isopropylidene glycol and 0.5 g of potassium tert-butoxide as a catalyst were charged into an autoclave, and the air in the autoclave was replaced with dry nitrogen. The catalyst was then dissolved at 130°C with stirring. Subsequently, 866 g of ethylene oxide was added dropwise using a dropping device at 130°C and 0.2 to 0.5 MPa (gauge pressure), and the mixture was stirred for 1 hour. The reaction mixture was then removed from the autoclave, adjusted to pH 3 with hydrochloric acid, and deacetalized. The mixture was then neutralized with potassium hydroxide and treated at 100°C under reduced pressure of -0.095 MPa (gauge pressure) for 3 hours to remove the water content, followed by filtration to obtain Example Compound A-1.

[0058] <Synthesis Examples 2 to 3: Example Compound A-2, Comparative Example Compound A′-1> Example compound A-2 and comparative example compound A'-1 were obtained in the same manner as in Synthesis Example 1, except that the amounts of ethylene oxide, propylene oxide, and butylene oxide added were changed. However, in the case of a random adduct such as comparative example compound A'-1, ethylene oxide and propylene oxide or butylene oxide were mixed in advance and the mixture was added dropwise using a dropping device to carry out the reaction. In addition, in the case of a block adduct such as example compound A-2, propylene oxide was added dropwise using a dropping device to achieve a predetermined number of moles of addition, and then ethylene oxide was added dropwise using a dropping device to achieve a predetermined number of moles of addition, to carry out the reaction.

[0059] Furthermore, the number average molecular weights of the ethylene oxide and propylene oxide adducts were determined from the hydroxyl value obtained by hydroxyl value measurement in accordance with JIS K1557-1, and the values ​​of a and b in formula (1) were determined from the number average molecular weights. The total average number of moles of ethylene oxide and propylene oxide added for example compounds A-1 to A-2 and comparative example compound A'-1 are shown in Table 1. In Table 1, "AO" represents the type of oxyalkylene group (AO) possessed by the alkylene oxide derivative shown in formula (1), and "PO" represents an oxypropylene group. Table 1 also shows the monoether purity calculated by the above-mentioned method.

[0060] [Table 1]

[0061] [Evaluation method] Components (A) to (D), (A'), (D') and other components were prepared as water-in-oil sunscreen cosmetics in the compositions shown in Tables 2 and 3 (Examples) and Table 4 (Comparative Examples), and were evaluated according to the following criteria for (1) SPF improvement, (2) resistance to removal when sweating, and (3) uneven application of foundation. The compound composition of component (A) used in the evaluation is shown in Table 1.

[0062] (1) SPF improvement effect For each cosmetic composition shown in the Examples and Comparative Examples, a blank containing neither component (A) nor component (A') was prepared, and each sample was applied to a PMMA plate (HELIOPLATE HD6 manufactured by Labsphere) at a concentration of 2 mg / cm. 2 After application, the sample was left to stand in a dark place for 20 minutes, and the SPF was measured using an SPF analyzer (UV-2000S manufactured by Labsphere). Nine points on the plate were measured, and the average value was used to calculate the SPF. ブランク Each of the cosmetics in the Examples and Comparative Examples was also obtained with [SPF 試料 The rate of change in SPF relative to the blank was calculated using the following formula: SPF change rate relative to blank = [SPF 試料 ] / [SPF ブランク ] x 100

[0063] The rate of change in SPF relative to the blank was evaluated according to the following criteria, and a change of 125% or more was determined to be a water-in-oil sunscreen cosmetic having an SPF-improving effect.

[0064] <Evaluation criteria> ◎: Change rate is 150% or more ○: Change rate is 125% or more, but less than 150% △: Change rate is 110% or more but less than 125% ×: Rate of change is less than 110%

[0065] (2) Durability when sweating Twenty women (aged 23 to 55) served as panelists, and 0.1 g of each of the water-in-oil sunscreen cosmetics of the Examples and Comparative Examples was applied to the forearms. The panelists were placed in a constant temperature and humidity room at 40°C and 70% humidity for 30 minutes to induce sweating. After leaving the room, the sweat was wiped off with tissue paper. The feel of the forearm after wiping was scored according to the following evaluation criteria. The scores of the 20 panelists were totaled, and a total score of 20 or more was determined to be a water-in-oil sunscreen cosmetic that was difficult to remove with sweat.

[0066] <Evaluation criteria> 2 points: There is sufficient sunscreen remaining. 1 point: A small amount of sunscreen has come off. 0 points: Most of the sunscreen has come off.

[0067] ◎: Total score is 30 points or more ○: Total score is 20 or more but less than 30 points △: Total score is 10 or more but less than 20 points ×: Total points are less than 10 points

[0068] (3) Uneven application of foundation Twenty women (aged 23-55) served as panelists, and 0.1 g of each of the water-in-oil sunscreen cosmetics from the Examples and Comparative Examples was applied to the forearms. After drying for 3 minutes, a commercially available powder foundation was taken up with a puff and spread over the forearms. The unevenness of application was scored according to the following evaluation criteria. The scores of the 20 panelists were calculated in total, and those with a total score of 20 or more were judged to be water-in-oil sunscreen cosmetics that prevented uneven application of foundation and other makeup. Commercially available foundation: Integrate Pro Finish Foundation (Shiseido Co., Ltd.)

[0069] <Evaluation criteria> 2 points: No unevenness occurs when spreading. 1 point: There is slight unevenness in the paint when spreading. 0 points: When spreading, there is unevenness in the coating.

[0070] ◎: Total score is 30 points or more ○: Total score is 20 or more but less than 30 points △: Total score is 10 or more but less than 20 points ×: Total points are less than 10 points

[0071] The compositions and evaluation results of Examples 1 to 11 and Comparative Examples 1 to 7 are shown in Tables 2 to 4. The compositions shown in Tables 2 to 4 indicate the ratio (parts by mass) of each component when the total mass is taken as 100 parts by mass. Table 5 shows the compositions of components common to water-in-oil sunscreen cosmetics. The compositions shown in Table 5 indicate the ratio (parts by mass) of each component when the total mass of the compositions shown in Tables 2 to 4 is taken as 100 parts by mass.

[0072] The materials used in the water-in-oil sunscreen cosmetic are as follows: Titanium dioxide: Fatty acid-treated titanium dioxide fine particles ("MT-10EX" manufactured by Teika Corporation, average primary particle diameter 10 nm) Zinc oxide: Silicone-treated zinc oxide fine particles (Teikai Co., Ltd. "MZY-505M", average primary particle diameter 25 nm)

[0073] [Table 2]

[0074] [Table 3]

[0075] [Table 4]

[0076] [Table 5]

[0077] All of the samples in Examples 1 to 11 had a sufficient SPF-enhancing effect, were resistant to coming off when sweating, and were able to prevent uneven application of the foundation.

[0078] On the other hand, in Comparative Examples 1 to 7, sufficient effects were not obtained.

[0079] That is, in Comparative Example 1, because component (A) was not included, there was no SPF-improving effect, and the effects of preventing foundation from coming off when sweating and preventing uneven foundation application were insufficient. In Comparative Example 2, because component (C) was not included, the effects of preventing foundation from coming off when sweating and preventing uneven foundation application were insufficient. In Comparative Example 3, because component (D) was not included, the effects of preventing foundation from coming off when sweating were insufficient. In Comparative Example 4, because an alkylene oxide derivative different from component (A) was blended, the effects of improving SPF, preventing foundation from coming off when sweating, and preventing uneven foundation application were insufficient. In Comparative Example 5, because the content of component (A) was high, the effects of preventing foundation from coming off when sweating and preventing uneven foundation application were insufficient. In Comparative Example 6, because the content of component (C) was high, the effects of preventing foundation from coming off when sweating and preventing uneven foundation application were insufficient. In Comparative Example 7, because the content of component (D) was high, the effects of preventing foundation from coming off when sweating and preventing uneven foundation application were insufficient. [Industrial Applicability]

[0080] The medium-oil sunscreen cosmetic of the present invention can be applied to the skin, such as the face or skin, and has unique effects that cannot be obtained with conventional sunscreen cosmetics, specifically, it is resistant to being washed off by sweat and can prevent uneven application when makeup is applied, and therefore it is expected to be used as a sunscreen cosmetic, makeup base, etc.

Claims

[Claim 1] A water-in-oil sunscreen cosmetic comprising 0.5 to 10 mass% of the following component (A), 5 to 35 mass% of component (B), 0.1 to 5 mass% of component (C), and 0.1 to 5 mass% of component (D): (A) An alkylene oxide derivative represented by the following formula (1): 【Chemistry 1】 (In formula (1), AO represents an oxyalkylene group having 3 to 4 carbon atoms, EO represents an oxyethylene group, a represents the number of moles of the oxyalkylene group having 3 to 4 carbon atoms added, b represents the number of moles of the oxyethylene group added, a represents a number from 0 to 50, b represents a number from 1 to 50, a+b≧10, and 0≦a / b≦2. When the alkylene oxide derivative represented by formula (1) has both the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group, the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group are added in a random or block manner, and in the case of block addition, the order of arrangement does not matter.) (B) UV scattering agent (C) Dextrin fatty acid ester or sucrose fatty acid ester (D) Cation-modified clay minerals

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