JP7800315B2 - Water-in-oil sunscreen cosmetics - Google Patents

Description

The present invention relates to a water-in-oil sunscreen cosmetic.

Protecting skin from UV damage is an important issue in skincare 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, but 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 whitish cast after application. To achieve a pleasant feel and texture, as well as good UV protection, it is necessary to reduce the amount of UV scattering agents used.

Because the continuous phase of water-in-oil cosmetics is oil, they are less likely to produce the squeaky feeling that is typical of UV scattering agents, and have other advantages, such as excellent water resistance.

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, thereby providing excellent ultraviolet protection, as well as ease of use, stability, and cleansing properties.

In addition, sunscreen cosmetics are often used as a base before applying makeup. In particular, if a water-in-oil sunscreen cosmetic is applied before applying makeup such as foundation, which often contains oil-absorbing powder, the oil in the sunscreen cosmetic can be absorbed, resulting in uneven application of the applied film.

Patent Document 2 proposes a water-in-oil emulsion cosmetic that combines a vinyl polymer with a carbosiloxane dendrimer structure in its side chain, hydrophobically treated powder, and pentaerythritol fatty acid ester, which allows foundation to adhere cleanly.

JP 2010-222349 A JP 2016-160191 A

Patent Document 1 proposes a water-in-oil sunscreen cosmetic that is excellent in terms of ease of use and stability. 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 can cause re-emulsification, resulting in the breakdown of the applied film (causing 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.

Furthermore, Patent Document 2 proposes a water-in-oil emulsion cosmetic that adheres to 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.

In view of the above problems, the present invention aims to provide a water-in-oil sunscreen cosmetic that enhances UV protection while reducing the amount of UV scattering agent blended using an SPF-improving ingredient, is resistant to smearing when sweating, and prevents uneven application of makeup such as foundation.

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

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):

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 mineral

The water-in-oil sunscreen cosmetic of the present invention enhances UV protection effects while reducing the amount of UV scattering agent used thanks to the SPF-enhancing ingredients, is resistant to smearing when sweating, and prevents uneven application of makeup such as foundation.

Embodiments of the present invention are described below. In this specification, numerical ranges defined using the symbol "to" are intended to include the numerical values at both ends of the symbol (upper and lower limits). For example, "2 to 5" means a range of 2 or more and 5 or less.

The sunscreen cosmetic of the present invention contains at least component (A), component (B), component (C), and component (D). Each component is described below.

[Component (A)]
Component (A) is an alkylene oxide derivative represented by formula (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 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 groups having 3 to 4 carbon atoms and the oxyethylene groups are added in a random or block manner, and if they are added in blocks, the order of arrangement is not important.

By setting a to 50 or less, the SPF is improved, the product stays on better when you sweat, and stickiness is reduced. Therefore, a should be between 0 and 50, with 0 to 40 being preferable and 0 to 30 being most preferable.

By setting b to 1 or greater, the SPF is improved and makeup application is prevented from becoming uneven. Furthermore, by setting b to 50 or less, the makeup is less likely to come off when sweating. Therefore, b should be between 1 and 50, with 10 to 40 being preferable, and 10 to 30 being even more preferable.

By making a+b 10 or more, the effect of preventing uneven makeup application can be improved. Therefore, a+b should be 10 or more, with 20 or more being most preferable. There is no particular upper limit for a+b, but from the perspective of improving the SPF improvement effect, it is preferable to make it 50 or less.

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 pattern. When added in a block pattern, 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.

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 makeup application. Therefore, a/b should be 2 or less, with 1.2 or less being most preferable. The lower limit of a/b is 0, but it can also be 0.3 or more.

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

The alkylene oxide derivative represented by formula (1) has a monoether structure in which an alkylene oxide is added to the first-position hydroxyl group of the three hydroxyl groups in glycerin. The monoether purity is 80% or more, preferably 90% or more, and more preferably 95% or more. There is no particular upper limit to the monoether purity, but it can be 100% or less.

The monoether purity can be calculated from the following formula using the peak integral value obtained by ¹ H-NMR measurement.

X represents the peak integral 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 at approximately 3.3 ppm, which is derived from the methine group at the 2-position of glycerin and is detected only in monoethers, is taken as 1. However, if the peak integral at approximately 3.3 ppm, which is derived from the methine group at the 2-position of glycerin in monoethers, cannot be detected, the monoether purity is taken as 0.

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 product, the two or more alkylene oxides are mixed together before addition polymerization. In the case of a block product, AO can be polymerized first followed by EO, or EO can be polymerized first followed by AO. An acid such as hydrochloric acid, phosphoric acid, or acetic acid is then added to carry out deacetalization, and excess acid is neutralized with a base such as potassium hydroxide or sodium hydroxide. The water and neutralization salts are then removed to obtain the alkylene oxide derivative.

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, improves resistance to removal when sweating, and reduces uneven makeup application. Not including an excessive amount of component (A) can reduce the effect of reducing uneven makeup application and prevent stickiness.

[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.

The titanium oxide and zinc oxide used as UV scattering agents may be the titanium oxide and zinc oxide commonly used in cosmetics. Preferably, the skin composition contains titanium oxide and zinc oxide with better dispersibility, for example, titanium oxide and zinc oxide that have been surface-treated, specifically hydrophobized, using a known method as needed.

Surface treatment methods include silicone treatment with methylhydrogenpolysiloxane, methylpolysiloxane, etc.; fluorine treatment with perfluoroalkyl phosphate ester, perfluoroalcohol, etc.; amino acid treatment with N-acylglutamic acid, etc.; alkylalkoxysilane treatment with octyltriethoxysilane, octyltrimethoxysilane, etc.; lecithin treatment; metal soap treatment; fatty acid treatment; alkyl phosphate ester treatment, etc.

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

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), sufficient UV protection effects can be achieved as a sunscreen cosmetic. By not including an excessive amount of component (B), uneven application of makeup is less likely to occur, and reduced deterioration in the feel when used, such as a rough feeling or a white cast, can be suppressed.

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

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.

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

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.

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

Component (C) can be one or more selected from these. From the viewpoint of preventing uneven application of makeup, dextrin palmitate is preferred.

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, sufficiently enhances the ability to withstand sweating and prevents uneven makeup application. By not including an excessive amount of component (C), it is possible to reduce the sticky feeling during use, improve the ability to withstand sweating, and make it easier to prevent uneven makeup application.

[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.

Specific examples of component (D) include dimethyl distearyl ammonium hectorite, dimethyl distearyl ammonium bentonite, benzyl dimethyl stearyl ammonium hectorite, and magnesium aluminum silicate treated with distearyl dimethyl ammonium chloride. Dimethyl distearyl ammonium hectorite is preferred from the viewpoint of preventing uneven makeup application.

Specific examples of quaternary ammonium salt 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 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 compounds in which the chloride of each of the above compounds is replaced with a bromide compound, as well as dipalmityl propyl ethyl ammonium methyl sulfate.

The concentration of component (D) added is 0.1 to 5% of the total mass of the water-in-oil sunscreen cosmetic, preferably 0.5 to 3%, and more preferably 1 to 2%. Increasing the content of component (D) improves the SPF and sufficiently reduces uneven makeup application. By not including an excessive amount of component (D), the SPF is improved, the makeup remains firm even when sweating, and the cosmetic is less likely to lose stability.

[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 in 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.

In addition to the above-mentioned 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, provided that the purpose of the present invention is not impaired.

Such additives include, for example, 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)anilino]-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.

Surfactants with an HLB of 3 to 7 are preferred, such as PEG-9 polydimethylsiloxyethyl dimethicone, PEG-10 dimethicone, glyceryl oleate, glyceryl isostearate, polyglyceryl-2 oleate, and polyglyceryl-2 stearate.

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

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 according to commonly used methods. For example, it can be produced 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.

The water-in-oil sunscreen cosmetic of the present invention can be provided in a variety of forms suitable for various uses, such as emulsion, cream, gel, etc.

The present invention will be explained in detail below with reference to examples and comparative examples.

[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. Thereafter, the reaction composition was removed from the autoclave, and the pH was adjusted to 3 with hydrochloric acid to carry out deacetalization. Thereafter, the reaction composition was neutralized with potassium hydroxide and treated at 100°C under a reduced pressure of -0.095 MPa (gauge pressure) for 3 hours to remove contained water, followed by filtration to obtain Example Compound A-1.

<Synthesis Examples 2 and 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.

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 this number-average molecular weight. Table 1 shows 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. 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 using the method described above.

[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 Example), 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.

(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 2 mg/ ^cm2 . The sample was then left to stand in a dark place for 20 minutes, and the SPF of the sample was measured using an SPF analyzer (UV-2000S, manufactured by Labsphere). Measurements were taken at nine points on the plate, and the [SPF _blank ] was obtained from the average value. [SPF _sample ] was also measured in the same manner for each cosmetic composition in the Examples and Comparative Examples. The rate of change in SPF relative to the blank was calculated using the following formula:
SPF change rate relative to blank = [SPF _sample ] / [SPF _blank ] x 100

The rate of change in SPF compared to the blank was evaluated according to the following criteria, and a product that was 125% or higher was determined to be a water-in-oil sunscreen cosmetic with an SPF-enhancing effect.

<Evaluation criteria>
◎: Rate of change is 150% or more ○: Rate of change is 125% or more but less than 150% point △: Rate of change is 110% or more but less than 125% ×: Rate of change is less than 110%

(2) Removal Resistance When Sweating Twenty women (aged 23 to 55) were used 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 forearm. 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 total score of the evaluations by the 20 panelists was calculated, and a cosmetic with a total score of 20 or more was judged to be a water-in-oil sunscreen cosmetic that was difficult to remove with sweat.

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

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

(3) Uneven Foundation Application Twenty women (aged 23 to 55) were used 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 forearm. After drying for 3 minutes, a commercially available powder foundation was taken up with a puff and spread over the forearm. The unevenness of application was scored according to the following evaluation criteria. The total score of the evaluations by the 20 panelists was calculated, and a total score of 20 or more was judged to be a water-in-oil sunscreen cosmetic that reduces uneven application of makeup such as foundation.
Commercially available foundation: Integrate Pro Finish Foundation (Shiseido Co., Ltd.)

<Evaluation criteria>
2 points: No unevenness in application occurs when spread.
1 point: When spread, there is slight unevenness in the coating.
0 points: When spread, the coating is uneven.

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

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 listed 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 listed in Table 5 indicate the ratio (parts by mass) of each component when the total mass of the compositions listed in Tables 2 to 4 is taken as 100 parts by mass.

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

All of the samples in Examples 1 to 11 had sufficient SPF improvement effects, were less likely to come off when sweating, and were able to reduce uneven application of the foundation.

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

That is, Comparative Example 1 did not contain component (A), so it did not improve SPF, and its effects of preventing foundation from coming off when sweating and preventing uneven application were insufficient. Comparative Example 2 did not contain component (C), so it did not contain component (D), so it did not contain component (D), so it did not contain component (D). Comparative Example 4 contained an alkylene oxide derivative different from component (A), so it did not improve SPF, prevent foundation from coming off when sweating, and prevent uneven application. Comparative Example 5 contained a high amount of component (A), so it did not contain component (A), so it did not contain component (A). Comparative Example 6 contained a high amount of component (C), so it did not contain component (C), so it did not contain component (D), so it did not contain component (D).

The medium-oil sunscreen cosmetic of the present invention can be applied to the face, skin, and other skin types, and has unique effects not available with conventional sunscreen cosmetics. Specifically, it is resistant to sweat and prevents uneven application when wearing makeup, making it promising for use as a sunscreen cosmetic or makeup base.

Claims (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):
(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 mineral