Oil-in-water sunscreen cosmetics

Abstract

To provide oil-in-water sunscreen cosmetics which can have the content of a UV protector to be reduced owing to an SPF improver, while having a high UV protection effect, with a good feeling of adhesion and an effect of rendering pores inconspicuous.SOLUTION: Oil-in-water sunscreen cosmetics contain (A) a divalent metal salt of a C12-18 fatty acid of 0.1 mass%-5 mass%, (B) at least one selected from the group consisting of titanium oxide and zinc oxide of 1 mass%-30 mass%, (C) an oil solution that is liquid at 25°C of 1 mass%-20 mass%, (D) a polyacrylic acid-based water-soluble polymer of 0.1 mass%-1 mass%, and (E) a specific alkylene oxide derivative of 0.1 mass%-10 mass%.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] When UV rays hit the skin, they immediately cause sunburn such as erythema and darkening, and in the long term they cause photoaging phenomena such as spots and wrinkles. This knowledge is gradually spreading among the general consumer, and sunscreen cosmetics are becoming something that is used not only for summer leisure activities but also on a daily basis.

[0003] As sunscreen cosmetics become more widely used among consumers, they are being sought after for various added value, such as skin care benefits in addition to UV protection. For example, Patent Document 1 proposes a sunscreen cosmetic that combines an organically modified clay mineral, a specific form of hydrophobic titanium oxide, oil, and water, and is characterized by its excellent adhesion. Furthermore, Patent Document 2 proposes a cosmetic composition containing a crosslinked organopolysiloxane polymer, butyl methoxydibenzoylmethane, tribehenin, and a specific liquid oil to reduce the appearance of pores.

[0004] Meanwhile, the UV protection effect of sunscreen cosmetics is quantified by an SPF value, with higher UV protection effects corresponding to higher SPF values. UV protection agents that provide UV protection can be broadly divided into UV absorbers, such as ethylhexyl methoxycinnamate, and UV scattering agents, such as titanium oxide. A high SPF requires a high blend of these. However, a high blend of UV absorbers can lead to stickiness and a poor feel. Furthermore, a high blend of UV scattering agents can cause a rough, dry skin. To address these issues, incorporating an SPF improver that enhances the effectiveness of the UV protection agent can provide sufficient UV protection while reducing the amount of UV protection agent used. For example, Patent Document 3 proposes a sunscreen cosmetic containing an inorganic UV protection agent consisting of a carboxylic acid-modified silicone, a vinyl polymer emulsion, a basic compound, and hydrophobic metal oxide microparticles, and describes how the combined use of the carboxylic acid-modified silicone and the vinyl polymer emulsion improves the SPF. However, Patent Document 3 is insufficient in terms of effects such as adhesion and pore invisibility. Therefore, there is a need for the development of an oil-in-water sunscreen cosmetic that has excellent adhesion and pore-invisibility effects, and that has a high UV protection effect while reducing the amount of UV protection agent used due to its SPF boost effect. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 7-258055 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-26234 [Patent Document 3] International Publication No. 2020 / 036064 Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the present invention is to provide an oil-in-water sunscreen cosmetic that has a high ultraviolet protection effect while reducing the amount of ultraviolet protection agent blended by using an SPF improver, and has excellent adhesion and the effect of making pores less noticeable. [Means for solving the problem]

[0007] As a result of extensive research into solving the above-mentioned problems, the present inventors have found that an oil-in-water sunscreen cosmetic that can solve the above-mentioned problems can be obtained by incorporating a combination of a divalent metal salt of a fatty acid having 12 to 18 carbon atoms, at least one member selected from the group consisting of titanium oxide and zinc oxide, an oil that is liquid at 25°C, a water-soluble polyacrylic acid polymer, and an alkylene oxide derivative, each in a specific range of content, and have thus completed the present invention. That is, the present invention relates to the following [1].

[0008] [1] (A) 0.1% by mass to 5% by mass of a divalent metal salt of a fatty acid having 12 to 18 carbon atoms, An oil-in-water sunscreen cosmetic comprising (B) 1% by mass to 30% by mass of at least one selected from the group consisting of titanium oxide and zinc oxide, (C) 1% by mass to 20% by mass of an oil agent that is liquid at 25°C, (D) 0.1% by mass to 1% by mass of a polyacrylic acid-based water-soluble polymer, and (E) 0.1% by mass to 10% by mass of an alkylene oxide derivative represented by the following formula (1): Z-[O(PO)m(EO)n(BO)pH]a...Equation (1) (In formula (1), Z is a residue obtained by removing hydroxyl groups from a polyhydric alcohol having 2 to 4 hydroxyl groups, a is 2 to 4, PO is an oxypropylene group, EO is an oxyethylene group, and BO is an oxybutylene group. m and n are the average numbers of moles of the oxypropylene groups PO and the oxyethylene groups EO added, respectively, and 0≦m≦50 and 0≦n≦50. p is the average number of moles of the oxybutylene groups BO added, and 0≦p≦5, provided that m, n, and p are not all 0. When m and n are not all 0, the mass ratio of PO to EO (PO / EO) is 1 / 5 to 5 / 1.) [Effects of the Invention]

[0009] The oil-in-water sunscreen cosmetic of the present invention has a high UV protection effect while reducing the amount of UV protection agent blended due to the SPF improver, and is excellent in adhesion and the effect of making pores less noticeable. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described. The oil-in-water sunscreen cosmetic of the present invention contains (A) a divalent metal salt of a fatty acid having 12 to 18 carbon atoms, (B) at least one member selected from the group consisting of titanium oxide and zinc oxide, (C) an oil agent that is liquid at 25°C, (D) a polyacrylic acid-based water-soluble polymer, and (E) an alkylene oxide derivative. Each component is described below.

[0011] [(A) Divalent metal salt of fatty acid having 12 to 18 carbon atoms] Examples of divalent metal salts of fatty acids having 12 to 18 carbon atoms (component (A)) used in the oil-in-water sunscreen cosmetic of the present invention include zinc laurate, calcium laurate, magnesium laurate, zinc myristate, calcium myristate, magnesium myristate, zinc palmitate, calcium palmitate, magnesium palmitate, zinc stearate, calcium stearate, magnesium stearate, etc., with zinc stearate being preferred. Component (A) corresponds to an SPF improver.

[0012] The component (A) in the oil-in-water sunscreen cosmetic of the present invention is not particularly limited and any component commonly used in the cosmetic field can be used, but from the standpoints of SPF boosting effect and making pores less noticeable, those with an average particle size of 1 to 50 μm are preferred. The oil-in-water sunscreen cosmetic of the present invention can contain, as component (A), one or a combination of two or more of zinc, calcium, or magnesium fatty acids having 12 to 18 carbon atoms. Furthermore, from the viewpoint of SPF-boosting effect, component (A) preferably contains a combination of a divalent metal salt of a fatty acid having an average particle size of 1 to 5 μm and a divalent metal salt of a fatty acid having an average particle size of 10 to 50 μm. These two types of divalent metal salts of fatty acids with average particle sizes are preferably divalent metal salts of the same type of fatty acid. Of these, it is particularly preferred that component (A) contain a combination of zinc stearate having an average particle size of 1 to 5 μm and zinc stearate having an average particle size of 10 to 50 μm. In this specification, the average particle size is the average particle size (D50) measured using a laser scattering particle size distribution analyzer. The average particle size (D50) means the cumulative 50% particle size on a volume basis. The content of the component (A) in the oil-in-water sunscreen cosmetic of the present invention is 0.1 to 5% by mass, preferably 0.2 to 4.5% by mass, and more preferably 0.3 to 3.5% by mass. If the content of component (A) is less than 0.1% by mass, the SPF boost effect may be reduced or the effect of making pores less noticeable may be inferior, and if the content of component (A) is more than 5% by mass, the feeling of adhesion may be reduced.

[0013] [(B) At least one selected from the group consisting of titanium oxide and zinc oxide] The at least one selected from the group consisting of titanium oxide and zinc oxide (component (B)) used in the oil-in-water sunscreen cosmetic of the present invention is not particularly limited, and any oxide commonly used in the cosmetic field can be used. Component (B) corresponds to an ultraviolet protection agent. In addition, titanium oxide or zinc oxide may be untreated or may be subjected to various surface treatments, but preferably is subjected to surface treatments that have excellent dispersibility.Surface treatment agents that can be used include, for example, inorganic minerals such as aluminum hydroxide and hydrated silica, 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.In addition, titanium oxide and zinc oxide may be in the form of fine particles, and preferably have an average primary particle size of 50 nm or less.

[0014] The oil-in-water sunscreen cosmetic of the present invention may contain titanium oxide or zinc oxide as component (B) either singly or in combination of two kinds, and a combination of two kinds is preferred. The content of the component (B) in the oil-in-water sunscreen cosmetic of the present invention is 1 to 30% by mass, preferably 3 to 25% by mass, and more preferably 5 to 20% by mass. If the content of component (B) is less than 1% by mass, the SPF and pore invisibility may decrease, and if the content of component (B) is more than 30% by mass, the feeling of adhesion may decrease.

[0015] [(C) Oil that is liquid at 25°C] The oil agent (component (C)) that is liquid at 25°C and is used in the oil-in-water sunscreen cosmetic of the present invention can be any oil agent that is commonly used in ordinary cosmetics without any particular limitations. Liquid oils that can be used in the oil-in-water sunscreen cosmetic of the present invention include hydrocarbon oils such as liquid paraffin, squalane, and hydrogenated polyisobutene; silicones such as methylpolysiloxane (e.g., dimethicone), methylphenylpolysiloxane, methylhydrogenpolysiloxane, and methylcyclopolysiloxane (e.g., cyclopentasiloxane); triglycerides such as olive oil, sunflower oil, and triethylhexanoin; and ester oils such as isononyl isononanoate, octyldodecyl myristate, ethylhexyl palmitate, pentaerythrityl tetraethylhexanoate, and jojoba oil. Among these, hydrogenated isopolybutene, dimeconone, cyclopentasiloxane, and isononyl isononanoate are preferred as component (C), with cyclopentasiloxane being more preferred. The oil-in-water sunscreen cosmetic of the present invention may contain one type of liquid oil alone or two or more types in combination as component (C). The content of the component (C) in the oil-in-water sunscreen cosmetic of the present invention is 1 to 20% by mass, preferably 2 to 18% by mass, and more preferably 4 to 15% by mass. If the content of component (C) is less than 1% by mass, the feeling of adhesion may decrease, and if the content of component (C) is more than 20% by mass, the pores may not be as visible.

[0016] [(D) Polyacrylic acid-based water-soluble polymer] The polyacrylic acid-based water-soluble polymer (component (D)) used in the oil-in-water sunscreen cosmetic of the present invention is not particularly limited, but examples include acrylic acid-based polymers, which are polymers of monomer components containing at least one selected from the group consisting of acrylic acid, methacrylic acid, and acrylic acid amide, and crosslinked products thereof. Examples of component (D) include acrylic acid-based polymers such as polyacrylic acid, carboxyvinyl polymers, alkyl-modified carboxyvinyl polymers, polyacrylic acid amides, and acrylamide / acrylic acid copolymers. These acrylic acid-based polymers are usually neutralized with sodium hydroxide, potassium hydroxide, triethanolamine, triethylamine, basic amino acids such as lysine and arginine, or the like. Among these, as the component (D), a carboxyvinyl polymer or an alkyl-modified carboxyvinyl polymer is preferred, and an alkyl-modified carboxyvinyl polymer is more preferred. The carboxyvinyl polymer is a crosslinked acrylic acid polymer obtained by crosslinking the acrylic acid polymer with, for example, pentaerythritol allyl ether, sucrose allyl ether, or propylene allyl ether. The alkyl-modified carboxyvinyl polymer is a crosslinked copolymer of (meth)acrylic acid and an alkyl (meth)acrylate having an alkyl group with 10 to 30 carbon atoms. The crosslinked copolymer can be obtained by crosslinking the copolymer with, for example, an allyl ether of sucrose or an allyl ether of pentaerythritol. Here, (meth)acrylic acid means acrylic acid or methacrylic acid.

[0017] In the present invention, the component (D) can be a commercially available cosmetic raw material. Specific examples of such products include "Carbopol 940" (carboxyvinyl polymer), "Carbopol 941" (carboxyvinyl polymer), "Carbopol 1342" (alkyl-modified carboxyvinyl polymer), "Carbopol ETD2020" (alkyl-modified carboxyvinyl polymer), "Carbopol Ultrez10" (carboxyvinyl polymer), and "Carbopol Ultrez21" (alkyl-modified carboxyvinyl polymer), all manufactured by Lubrizol Advanced Materials; "AQUPEC HV-505E" (carboxyvinyl polymer) and "AQUPEC HV-501ER" (alkyl-modified carboxyvinyl polymer), all manufactured by Sumitomo Seika Chemicals; and "Syntaren K" (carboxyvinyl polymer) and "Syntaren L" (carboxyvinyl polymer), all manufactured by 3V Sigma.

[0018] The oil-in-water sunscreen cosmetic of the present invention may contain, as component (D), one type of polyacrylic acid-based water-soluble polymer, or two or more types in combination. The content of the component (D) in the oil-in-water sunscreen cosmetic of the present invention is 0.1 to 1 mass %, preferably 0.15 to 0.6 mass %, and more preferably 0.2 to 0.5 mass %. If the content of component (D) is less than 0.1% by mass, the feeling of adhesion may decrease, and if the content of component (D) is more than 1% by mass, the feeling of adhesion and the invisibility of pores may decrease.

[0019] [(E) Alkylene oxide derivatives] The alkylene oxide derivative (component (E)) used in the oil-in-water sunscreen cosmetic of the present invention is represented by formula (1). Z-[O(PO)m(EO)n(BO)pH]a...Equation (1) In formula (1), Z is a polyhydric alcohol having 2 to 4 hydroxyl groups, i.e., a residue obtained by removing all hydroxyl groups from (Z(OH)a), where a is the number of hydroxyl groups in the polyhydric alcohol and is 2 to 4. The polyhydric alcohol (Z(OH)a) is preferably a hydroxyl group-containing hydrocarbon, more preferably a hydroxyl group-containing saturated hydrocarbon. For example, when a=2, ethylene glycol, propanediol, or butylene glycol is used; when a=3, glycerin or trimethylolpropane is used; when a=4, erythritol, pentaerythritol, sorbitan, alkyl glycoside, or diglycerin is used; or a mixture of these may also be used. Among these, as the polyhydric alcohol (Z(OH)a), glycerin and alkyl glucosides having 1 to 2 carbon atoms are preferred, and glycerin is particularly preferred. From the viewpoint of sustained inconspicuousness of pores, it is more preferable that Z is a residue obtained by removing all hydroxyl groups from a polyhydric alcohol having 3 to 4 hydroxyl groups (Z(OH)a), and a is 3 to 4.

[0020] In formula (1), PO is an oxypropylene group, EO is an oxyethylene group, and BO is an oxybutylene group. m, n, and p are the average number of moles of oxypropylene groups PO, oxyethylene groups EO, and oxybutylene groups BO added per one hydroxyl group, respectively. m and n are 0≦m≦50 and 0≦n≦50, respectively. p is 0≦p≦5. In terms of adhesion, m, n, and p are not all 0 at the same time, and the total number of moles of m, n, and p added in one molecule of component (E), a×(m+n+p), is preferably 2 to 50, and more preferably 2 to 30. When m=0, n=1 to 10 and p=0 are preferred, and n=5 to 10 and p=0 are more preferred. When n=0, m=1 to 10 and p=0 are preferred, and m=1 to 5 and p=0 are more preferred. When m and n are not both 0, m and n are preferably 1 to 10 and p=0 to 2, and more preferably m and n are 1 to 8 and p=1 to 2. Among these, those in which m=0, n=5 to 10 and p=0 are particularly preferred.

[0021] When neither m nor n is 0, the mass ratio of PO to EO (PO / EO) is 1 / 5 to 5 / 1. If the mass ratio of PO to EO (PO / EO) is less than 1 / 5, the feeling of adhesion may decrease, and if the mass ratio of PO to EO (PO / EO) is more than 5 / 1, the pores may not be as noticeable. The mass ratio of PO to EO (PO / EO) is preferably 1 / 4 to 4 / 1, and more preferably 1 / 2 to 2 / 1. When two or more types of structures among EO, PO, and BO are contained, they may be added randomly or in blocks, or may contain a mixture of random and block portions.

[0022] The content of the component (E) in the oil-in-water sunscreen cosmetic of the present invention is from 0.1 to 10% by mass, preferably from 0.3 to 8% by mass, and more preferably from 0.5 to 5% by mass, from the viewpoints of adhesion and inconspicuousness of pores. If the content of component (E) is less than 0.1% by mass, the feeling of adhesion may decrease, and if the content of component (E) is more than 10% by mass, the feeling of adhesion and the invisibility of pores may decrease. From the viewpoint of adhesion, the content ratio of the component (E) to the component (A) [(E) / (A)] is preferably 1 / 5 to 5, more preferably 1 / 3 to 3, and even more preferably 1 / 2 to 2.

[0023] [Other ingredients] The oil-in-water sunscreen cosmetic of the present invention generally contains water in addition to the above components (A) to (E). Examples of water include purified water such as distilled water and deionized water, tap water, and industrial water, and water suitable for producing cosmetics, quasi-drugs, pharmaceuticals, and the like is used. The water content in the oil-in-water sunscreen cosmetic of the present invention is set so that the total amount of components (A) to (E) after adding the additives described below as necessary is 100% by mass, and is typically 30% to 80% by mass, preferably 60% to 75% by mass, and more preferably 50% to 70% by mass.

[0024] In addition to the above components (A) to (E) and water, the oil-in-water sunscreen cosmetic of the present invention may contain, as necessary, general additives used in cosmetics, quasi-drugs, pharmaceuticals, etc., within limits that do not impair the characteristics of the present invention. Examples of such additives include ultraviolet absorbers such as ethylhexyl methoxycinnamate, t-butylmethoxydibenzoylmethane, and bisethylhexyloxyphenol methoxyphenyl triazine; lower alcohols such as ethanol and isopropanol; dihydric polyhydric alcohols such as 1,3-butylene glycol, dipropylene glycol, and propylene glycol; sugars such as lactose and sucrose; silicone derivatives such as amino-modified dimethylpolysiloxane; anionic surfactants such as acylmethyl taurine salts, alkyl ether sulfate ester salts, and amide ether sulfate ester salts; water-soluble polymers such as carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl methylcellulose; cationic polymers such as ceramide, cholesterol, and cationized cellulose; thickening polysaccharides such as xanthan gum; organic or inorganic salts such as citrate, malate, and salt; acids and alkalis as pH adjusters; parabens; preservatives; anti-inflammatory agents; disinfectants; viscosity modifiers; cooling agents; chelating agents; extracts derived from plants and animals; vitamins; amino acids; colorants; pigments; and fragrances.

[0025] The oil-in-water sunscreen cosmetic of the present invention may contain one of the above additives alone or two or more of them in combination, as needed. The content of the above-mentioned additives in the oil-in-water sunscreen cosmetic of the present invention can be set according to the amount normally used in cosmetics and the like depending on the purpose, but is usually 20% by mass or less, preferably 0.1 to 15% by mass, and more preferably 0.5 to 10% by mass.

[0026] The oil-in-water sunscreen cosmetic of the present invention is a sunscreen cosmetic comprising an oil phase dispersed in a continuous aqueous phase, formed by emulsifying an oily component and an aqueous component, and can be produced by a commonly used method. For example, it can be produced by mixing and dissolving an oily component such as component (C), dispersing component (A) therein, and adding the resulting mixture to an aqueous component such as components (D) and (E) or water with stirring to emulsify. Furthermore, since component (B) disperses in different phases depending on the surface treatment condition, it is best to add it to the aqueous or oily phase depending on the surface treatment condition. [Example]

[0027] EXAMPLES The present invention will be explained in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0028] [Examples 1 to 18 and Comparative Examples 1 to 6] Oil-in-water sunscreen cosmetics Oil-in-water sunscreen cosmetics were prepared using components (A) to (E), component (A'), component (E'), other additives, and purified water according to the formulations shown in Tables 2 and 3. The four types of component (E) used in this preparation had the composition shown in Table 1. The raw materials shown below were used for each component shown in Tables 2 and 3. The numerical values ​​corresponding to each component in Tables 2 and 3 indicate the content (% by mass) of each component relative to the total amount of the oil-in-water sunscreen cosmetic, and "-" in the tables indicates that the component was not contained.

[0029] Component (A) (A-1): Zinc stearate "MZ-2" (NOF Corporation) (average particle size 1.5 μm) (A-2): Calcium stearate "MC-2" (NOF Corporation) (average particle size 2 μm) (A-3): Magnesium stearate "MM-2" (NOF Corporation) (average particle size 3 μm) (A-4): Zinc myristate "Powder Base M" (NOF Corporation) (average particle size 5 μm) (A-5): Zinc stearate (manufactured by NOF Corporation) (average particle size: 20 μm) Component (A') (A'-1): Talc "Crown Talc JS" (Matsumura Sangyo Co., Ltd.)

[0030] (B) Component (B-1): Titanium oxide "DIS-AB-10W" (manufactured by Sakai Chemical Industry Co., Ltd.) (titanium oxide content = 37% by mass) (B-2): Zinc oxide "DIF-AB-33W" (manufactured by Sakai Chemical Industry Co., Ltd.) (zinc oxide content = 55% by mass)

[0031] (C) Component (C-1): Cyclopentasiloxane "KF-995" (Shin-Etsu Chemical Co., Ltd.) (C-2): Dimethicone "KF-96A-100cs" (Shin-Etsu Chemical Co., Ltd.) (C-3): Hydrogenated polyisobutene "Pearleam 4" (NOF Corporation) (C-4): Isononyl isononanoate "KAK99" (Kyukyu Alcohol Kogyo Co., Ltd.)

[0032] (D) Component Alkyl-modified carboxyvinyl polymer; acrylic acid / alkyl methacrylate copolymer "Carbopol Ultrez 21" (manufactured by Lubrizol Japan, Inc.)

[0033] (E) Component (E-1): "Uniox G-1200" (NOF Corporation) (E-2): "Wilbride MG-2070" (NOF Corporation) (E-3): "Wilbride S-753" (NOF Corporation) (E-4): "MacbioBride MG-10E" (NOF Corporation) (E') component Polyethylene glycol (number average molecular weight 1500) "PEG#1540" (NOF Corporation)

[0034] Other additives The 11 additives shown in Table 4 were used.

[0035] The oil-in-water sunscreen cosmetics of Examples 1 to 18 and Comparative Examples 1 to 6 were applied in the following manner and evaluated for (1) SPF, (2) SPF boost effect, (3) adhesion, and (4) pore invisibility. For (3) and (4), 20 women (aged 25 to 45) were used as panelists, and each panelist applied approximately 0.5 g of each sunscreen cosmetic to the entire face.

[0036] (1) SPF The measurement sample was 1.3 mg / cm 2 The coating was applied to a polymethyl methacrylate plate (HELIOPLATE HD6, manufactured by Helioscience, France) with a surface roughness of 6 μm so that the coating was as shown in the figure, and the plate was irradiated with ultraviolet light. The amount of transmitted light was measured using a UV-2000S SPF analyzer (manufactured by Labsphere, USA). Each measurement was repeated five times, and the average value was used.

[0037] (2) SPF boost effect Calculation was performed using the following formula. A = SPF value of metal salt formulation (SPF value in the example) B = SPF value without metallic salts SPF improvement effect (%) = A / B x 100 The evaluation was based on the following criteria, and "◎" and "◯" were judged as passing. ◎: SPF improvement effect of 150% or more ○: SPF improvement effect is 130% or more but less than 150% △: SPF improvement effect is 110% or more but less than 130% ×: SPF improvement effect is less than 110%

[0038] (3) Adhesion The feeling of adhesion after application to the face was evaluated according to the following evaluation criteria, and the total score of the 20 panelists was calculated and judged according to the following evaluation criteria. Evaluation Criteria 2 points: If you feel that the fit is sufficient 1 point: If you feel a sense of close contact 0 points: If you feel there is no adhesion <Judgment criteria> ⊚: Total score of 30 or more; oil-in-water sunscreen cosmetic with very good adhesion after application. Good: Total score is 20 or more but less than 30 points; an oil-in-water sunscreen cosmetic that adheres well to the skin after application. △: Total score is 10 or more but less than 20 points; this is an oil-in-water sunscreen cosmetic that does not adhere well to the skin after application. ×: Total score less than 10 points; oil-in-water sunscreen cosmetic with poor adhesion after application.

[0039] (4) Less noticeable pores Immediately after application to the face, the subjects were asked to evaluate the inconspicuousness of pores according to the following evaluation criteria, and the total score of the 20 subjects was calculated and judged according to the following evaluation criteria. Evaluation Criteria 2 points: If you feel that your pores are not as noticeable as before applying the oil-in-water sunscreen 1 point: If you feel that your pores are less noticeable than before applying the oil-in-water sunscreen 0 points: If you feel that there is no change in the visibility of your pores compared to before applying the oil-in-water sunscreen cosmetic <Judgment criteria> ⊚: Total score of 30 points or more; an oil-in-water sunscreen cosmetic that makes pores extremely inconspicuous. Good: Total score is 20 or more but less than 30 points; an oil-in-water sunscreen cosmetic that is highly effective at making pores less noticeable. △: Total score is 10 or more but less than 20 points; this is an oil-in-water sunscreen cosmetic that is somewhat less effective at making pores less noticeable. ×: Total score less than 10 points; oil-in-water sunscreen cosmetic with low pore visibility.

[0040] The evaluation results are shown in Tables 2 and 3. The numbers in parentheses accompanying each evaluation result indicate the improvement rate of SPF for (2), and the total score for (3) adhesion and (4) pore invisibility.

[0041] [Table 1]

[0042] [Table 2]

[0043] [Table 3]

[0044] [Table 4]

[0045] As shown in Table 2, the oil-in-water sunscreen cosmetics of Examples 1 to 18 were all evaluated as having improved SPF due to the SPF enhancer, and as having excellent adhesion and the effect of making pores less noticeable. In particular, Example 7, in which the contents of the components (A) to (E) were within the more preferred ranges described above and the components (A) had two different average particle sizes, was rated as "Excellent" in all evaluation items. On the other hand, none of the oil-in-water sunscreen cosmetics of Comparative Examples 1 to 6 received a rating of "good" or higher in any of the evaluation items. The above evaluation results suggest that the oil-in-water sunscreen cosmetics of the examples of the present invention have excellent adhesion and pore-invisibility effects, and that the SPF boost effect allows them to achieve high UV protection effects while reducing the amount of UV protection agent used.

[0046] Table 5 shows an example of a sunscreen cosmetic formulation (o / w emulsion type).

[0047] [Table 5]

[0048] The oil-in-water sunscreen cosmetic composition having the composition shown in Table 5 had a high UV protection effect while reducing the amount of UV protection agent used due to the SPF improver, and was excellent in terms of adhesion and the effect of making pores less noticeable.

Claims

[Claim 1] (A) 0.1% by mass to 5% by mass of a divalent metal salt of a fatty acid having 12 to 18 carbon atoms, (B) 1% by mass to 30% by mass of at least one selected from the group consisting of titanium oxide and zinc oxide, (C) 1% by mass to 20% by mass of an oil agent that is liquid at 25°C, (D) 0.1% by mass to 1% by mass of a polyacrylic acid-based water-soluble polymer, (E) An oil-in-water sunscreen cosmetic containing 0.1% by mass to 10% by mass of an alkylene oxide derivative represented by the following formula (1): Z-[O(PO)m(EO)n(BO)pH]a...Formula (1) (In formula (1), Z represents a residue obtained by removing hydroxyl groups from a polyhydric alcohol having 2 to 4 hydroxyl groups, a is 2 to 4, PO is an oxypropylene group, EO is an oxyethylene group, and BO is an oxybutylene group. m and n represent the average number of moles of the oxypropylene groups PO and the oxyethylene groups EO added, respectively, and 0≦m≦50 and 0≦n≦50. p represents the average number of moles of the oxybutylene groups BO added, and 0≦p≦5, provided that m, n, and p are not all 0 at the same time. When m and n are not 0, the mass ratio of PO to EO (PO / EO) is 1 / 5 to 5 / 1.)

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