sunscreen cosmetics

Abstract

To provide a sunscreen cosmetic that offers sufficient UV protection while being non-greasy, maintaining moisture even in low temperature and low humidity conditions, blending well with the skin, and not feeling powdery even on dry skin. [Solution] The sunscreen cosmetic is characterized by containing (A) an ultraviolet scattering agent, (B) a starch-acrylic acid graft polymer salt, and (C) an oil with a melting point of 35°C or higher and 60°C or lower.

Description

Technical Field

[0001] The present invention relates to a sunscreen cosmetic containing an ultraviolet scattering agent as an ultraviolet protecting agent.

Background Art

[0002] In sunscreen cosmetics, an ultraviolet protecting agent is blended to obtain an SPF (Sun Protection Factor) effect. Examples of ultraviolet protecting agents include inorganic metal oxides (ultraviolet scattering agents) that scatter ultraviolet rays, such as titanium oxide and zinc oxide, and organic ultraviolet absorbers that absorb ultraviolet rays, such as oxybenzone and octinoxate. In recent years, as the adverse effects of ultraviolet rays on the skin have become generally recognized, sunscreen cosmetics have come to be used daily throughout the year. Against this background, there has been an increase in the number of people who are concerned about the burden on the skin with respect to sunscreen cosmetics used daily. As a result, so-called non-chemical type sunscreen cosmetics that contain only an ultraviolet scattering agent, which is an inorganic metal oxide, as an ultraviolet protecting agent have attracted attention.

[0003] However, when only an ultraviolet scattering agent is used, in order to achieve a sufficient SPF in daily life, the amount of the metal oxide, which is an ultraviolet scattering agent, to be blended increases, resulting in a problem that the spreadability during application deteriorates.

[0004] In contrast, Patent Document 1 proposes a cosmetic containing a metal oxide containing an ultraviolet scattering agent having a specific average particle diameter, a paste oil having a hydrophilic group, and a (acrylates / ethylhexyl acrylate / dimethicone methacrylate) copolymer. This cosmetic is described as having high dispersion stability even after 3 hours have passed since application, little resistance feeling due to powder, and being easy to spread on the skin.

[0005] Furthermore, Patent Document 2 proposes a sunscreen cosmetic containing fine metal oxide particles, a hydrophilic film-forming polymer, a liquid oil, and niacinamide. This sunscreen cosmetic is described as being non-greasy, not drying out over time, and having good high-temperature stability. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] WO2019 / 188842A1 [Patent Document 2] Japanese Patent Publication No. 2022-161428 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, the sunscreen cosmetic described in Patent Document 1 had a problem in terms of improving the stickiness of the skin after application.

[0008] Furthermore, sunscreen cosmetics are increasingly being used year-round to suit various lifestyles, and are now commonly used not only in summer but also in autumn and winter. However, the sunscreen cosmetic described in Patent Document 2 had the problem that when applied to dry skin in autumn and winter, it did not blend well with the skin and tended to feel powdery. Moreover, there was room for improvement in terms of the duration of moisturizing effect under the low temperature and low humidity conditions of autumn and winter.

[0009] The objective of this invention is to provide a sunscreen cosmetic that has sufficient UV protection, is non-sticky, maintains a moisturizing effect even in low temperature and low humidity conditions, blends well with the skin, and does not feel powdery when applied, even on dry skin. [Means for solving the problem]

[0010] The present invention relates to (1) and (2) below. (1) A sunscreen cosmetic characterized by containing (A) an ultraviolet scattering agent, (B) a starch-acrylic acid graft polymer salt, and (C) an oil having a melting point of 35°C or higher and 60°C or lower.

[0011] (2) The sunscreen cosmetic according to (1), further characterized by comprising (D) at least one of a whitening agent and an anti-inflammatory agent. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a sunscreen cosmetic that has sufficient UV protection effect, is non-sticky, maintains a moisturizing feeling even in low temperature and low humidity conditions, blends well with the skin, and does not feel powdery when applied, even on dry skin. [Modes for carrying out the invention]

[0013] ((A) UV scattering agent) An ultraviolet scattering agent refers to a substance that can scatter ultraviolet rays and protect the skin and other parts from ultraviolet radiation. Materials that can be used as ultraviolet scattering agents in this invention include metal oxides such as titanium dioxide, zinc oxide, iron oxide, zirconium oxide, and aluminum oxide. Furthermore, ultraviolet scattering agents can be made by micronizing or compounding these materials.

[0014] The ultraviolet scattering agent material preferably contains one or more selected from titanium dioxide and zinc oxide. The titanium dioxide and zinc oxide used as the ultraviolet scattering agent material may be titanium dioxide particles and zinc oxide particles commonly used in cosmetics.

[0015] Preferably, a more dispersible material can be used, for example, a material in which the surface of the ultraviolet scattering agent particles has been surface-treated by a known method as needed. Examples of such surface treatments include hydrophobic treatment and hydrophilic treatment. Methods for surface treatment of ultraviolet scattering agent particles include silicone treatment such as methylhydrogenpolysiloxane and methylpolysiloxane; fluorine treatment with perfluoroalkyl phosphate esters, perfluoroalcohols, etc.; amino acid treatment with N-acyl glutamic acid, etc.; alkylalkoxysilane treatment such as octyltriethoxysilane and octyltrimethoxysilane; and other treatments such as lecithin treatment, silica treatment, metal soap treatment, fatty acid treatment, and alkyl phosphate ester treatment.

[0016] The titanium dioxide particles and zinc oxide particles used as ultraviolet scattering agents are preferably micronized to a primary particle size of 8 to 80 nm, and more preferably to a primary particle size of 8 to 50 nm. Furthermore, from the viewpoint of further enhancing the ultraviolet protection effect, it is preferable to combine and blend ultraviolet scattering agent particles that have been hydrophilized with ultraviolet scattering agent particles that have been hydrophobic.

[0017] (A) The concentration of the UV scattering agent is preferably 3 to 20% by mass when the total amount of the sunscreen cosmetic is considered to be 100% by mass. (A) A UV scattering agent content of 3% by mass or more makes it easier to obtain sufficient UV protection, and 4.5% by mass or more is even more preferable. In addition, (A) a UV scattering agent content of 20% by mass or less can reduce stickiness and suppress powderiness when used on dry skin, but 18% by mass or less is preferable, 15% by mass or less is even more preferable, and 12% by mass or less is most preferable.

[0018] ((B) Starch-acrylic acid graft polymer salt) The sunscreen cosmetic composition of the present invention contains (B) a starch-acrylic acid graft polymer salt.

[0019] (B) The starch-acrylic acid graft polymer salt is a salt of a graft polymer in which starch is the main chain and at least acrylic acid is graft polymerized to the main chain. The type of salt is not particularly limited, but alkali metal salts such as lithium salts, sodium salts, and potassium salts are preferred, and sodium salts are particularly preferred. The starch source is not limited, but unprocessed starch and processed starch can be used. Unprocessed starch is starch obtained by extraction and purification from plant raw materials, and examples include sweet potato starch, potato starch, wheat starch, corn starch, rice starch, and tapioca starch. Modified starch is starch whose properties have been modified by subjecting the above-mentioned unmodified starch to physical, chemical, or enzymatic treatment. Examples include acetylated starch, octenyl succinate starch, hydroxypropylated starch, acetylated adipic acid cross-linked starch, acetylated phosphate cross-linked starch, acetate starch, oxidized starch, phosphate monoesterified phosphate cross-linked starch, phosphorylated starch, phosphate cross-linked starch, and hydroxypropylated phosphate cross-linked starch. Among these, corn-derived starch is preferred from the viewpoint of ease of availability.

[0020] (B) The starch-acrylic acid graft polymer salt may have starch as the main chain, with only acrylic acid graft polymerized to the main chain. Alternatively, with starch as the main chain, in addition to acrylic acid, one or more comonomers selected from the group consisting of acrylate monomers other than acrylic acid and methacrylate monomers may be graft polymerized to the main chain. Acrylamide is an example of such a comonomer. (B) Starch-acrylic acid graft polymer salts can be obtained by known methods described in Japanese Patent Application Publication No. 2023-35831, etc.

[0021] Examples of commercially available products include "MAKIMOUSSE7" (average particle size: approximately 7 μm), "MAKIMOUSSE12" (average particle size: approximately 12 μm), "MAKIMOUSSE25" (average particle size: approximately 25 μm), and "MAKIMOUSSE400" (average particle size: approximately 400 μm) (all manufactured by Daito Kasei Kogyo Co., Ltd.), "Surangeol ST-100SP" (average particle size: approximately 13 μm), "Surangeol ST-100MC" (average particle size: approximately 30 μm), "Surangeol 300" (average particle size: approximately 30 μm), "Surangeol 1000" (average particle size: approximately 400 μm) (all manufactured by Sanyo Chemical Industries, Ltd.), etc., which can be used.

[0022] In addition, examples of commercially available products of the sodium salt of a graft polymer (display name: starch / acrylamide / sodium acrylate copolymer) in which acrylic acid and acrylamide are graft-polymerized onto the starch main chain include "WaterLock A-240, A-180, B-204, D-223, A-100, C-200, and D-223" (manufactured by Grain Processing). Among them, from the viewpoint of enhancing the persistence of the moisturizing feeling under low-temperature and low-humidity conditions while suppressing stickiness, it is preferable to use a (B) starch-acrylic acid graft polymer salt (particularly preferably the sodium salt) having an average particle size of 10 μm to 50 μm, more preferably an average particle size of 10 μm to 30 μm. The average particle size is measured by dispersing the (B) component in methanol and using a laser diffraction particle size distribution measuring device [such as Microtrac (manufactured by Nikkiso Co., Ltd.)].

[0023] (B) When the total amount of the sunscreen cosmetic is 100% by mass, the concentration of the starch-acrylic acid graft polymer salt is preferably 0.005 to 1% by mass. By setting the concentration of the starch-acrylic acid graft polymer salt to 0.005% by mass or more, the sticky feeling is suppressed, and the powdery feeling when used on dry skin is further suppressed. It is more preferably 0.01% by mass or more, and still more preferably 0.02% by mass or more. Also, by setting the concentration of the starch-acrylic acid graft polymer salt to 1% by mass or less, the persistence of the moisturizing feeling is improved, and the powdery feeling when used on dry skin is suppressed. Preferably it is 0.8% by mass or less, more preferably 0.5% by mass or less, and still more preferably 0.3% by mass or less.

[0024] ((C) An oil agent having a melting point of 35°C or higher and 60°C or lower) The oil agent (C) having a melting point of 35°C or higher and 60°C or lower used in the present invention is not particularly limited as long as it is used in cosmetics. Specifically, regardless of the origin such as animal oil, vegetable oil, synthetic oil, etc., hydrocarbons such as petrolatum, oils and fats such as coconut oil, ester oils such as pentaerythritol fatty acid, silicone oils such as highly polymerized dimethylpolysiloxane, lanolin and lanolin derivatives, etc., which are usually used in cosmetics, can be mentioned, and one or more of these can be used. Among these, it is preferable to use ester oils, and among them, it is preferable to use diester forms of dimer acid and / or dimer diol, phytosterol fatty acid ester, and dipentaerythritol fatty acid ester. From the viewpoint of reducing the powdery feeling and enhancing the moisturizing feeling, it is more preferable to use dipentaerythritol fatty acid ester, and it is particularly preferable to use dipentaerythrityl hexahydroxystearate.

[0025] Diesters of dimer acids and / or dimer ols refer to esters of dimer acids obtained by dimerizing mono- or di-unsaturated fatty acids and then hydrogenating them as needed, with various alcohols, as well as esters of dimer ols obtained by reducing dimer acids with various fatty acids, and esters of dimer acids and dimer ols. Examples include di(phytosteryl / isostearyl / cetyl / stearyl / behenyl) dimer dilinoleate, di(isostearyl / phytosteryl) dimer dilinoleate, dilinoleyl diisostearate, and dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate. These compounds are commercially available from Nippon Seika Co., Ltd. as follows: di(phytosteryl / isostearyl / cetyl / stearyl / behenyl) dimer dilinoleate as "Plandool(registered trademark)-H", di(isostearyl / phytosteryl) dimer dilinoleate as "LUSPLAN(registered trademark)PI-DA", dilinoleyl dimer dilinoleate as "LUSPLAN(registered trademark)DD-DA5" and "LUSPLAN(registered trademark)DD-DA7", dimer dilinoleyl diisostearate as "LUSPLAN(registered trademark)DD-IS", and dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate as "Plandool(registered trademark)-G", etc. These can be purchased and used.

[0026] Examples of phytosterol fatty acid esters include macadamia nut oil fatty acid phytosteryl, lanolin fatty acid phytosteryl, stearate phytosteryl, isostearate phytosteryl, hydroxystearate phytosteryl, oleate phytosteryl, dihydrophytosteryl oleate, ricinoleate phytosteryl, nonanoate phytosteryl, rice bran oil fatty acid phytosteryl, palmitate phytosteryl, 2-ethylhexanoate phytosteryl, caprate phytosteryl, laurate phytosteryl, and butyrate phytosteryl. Examples of commercially available phytosterol esters include "Plandool-MAS" (macadamia nut fatty acid phytosteryl), "Plandool-ISS" (isostearate phytosteryl), "Plandool-SUN" (oleate phytosteryl), "Plandool-LG1", "Plandool-LG3", "Plandool-LG4" (lauroyl glutamate di(octyldodecyl / phytosteryl / behenyl)), and "Plandool-LG2" (lauroyl Examples include: Di(phytosteryl / octyldodecyl) glutamate (manufactured by Nippon Seika Co., Ltd.); "Eldew PS-203" (Di(phytosteryl / octyldodecyl) lauroyl glutamate), "Eldew PS-304", "Eldew PS-306" (Di(octyldodecyl / phytosteryl / behenyl) lauroyl glutamate), "Eldew APS-307" (Phytosteryl / decyltetradecyl myristoylmethyl-β-alanine) (manufactured by Ajinomoto Co., Inc.); "Saracos FH" (Phytosteryl hydroxystearate), "Saracos PO(T)" (Phytosteryl oleate) (manufactured by Nisshin Oillio Group Ltd.).

[0027] Dipentaerythrityl fatty acid esters are a type of ester oil that has an ester bond, formed by the condensation of multiple different fatty acids (e.g., hydroxystearic acid, a combination of stearic acid and rosinic acid, or a combination of hydroxystearic acid and isostearic acid) with the polyhydric alcohol dipentaerythritol. Specific examples of dipentaerythrityl fatty acid esters include hexa(hydroxystearic acid / stearic acid / rosinic acid)dipentaerythrityl (e.g., "Cosmoll 168ARV" (product name: Nisshin Oillio Co., Ltd.)), tetra(hydroxystearic acid / isostearic acid)dipentaerythrityl (e.g., "Cosmoll 168EV" (product name: manufactured by Nisshin Oillio Co., Ltd.)), and hexahydroxystearate dipentaerythrityl (e.g., "Cosmoll 168M" (product name: manufactured by Nisshin Oillio Co., Ltd.)).

[0028] In this invention, the melting point of the oil is measured by Method 3 of the general test methods described in the Cosmetic Raw Materials Standards. Specifically, the sample is gradually heated to 90-92°C while stirring to melt it, then the heating is stopped and the sample is allowed to cool to a temperature 8-10°C above its melting point. Next, the thermometer (a petrolatum melting point thermometer specified in Japanese Industrial Standard B7410) is cooled to 5°C, the moisture is wiped off with filter paper, half of the mercury bulb is inserted into the sample, and then immediately removed. The sample is kept vertical and allowed to cool. When the attached sample becomes cloudy, it is immersed in water at a temperature of 16°C or lower for 5 minutes. Next, the thermometer is inserted into the test tube and fixed with a cork so that the distance between the lower end of the thermometer and the bottom of the test tube is 15 mm. The test tube is placed in a 500 mL beaker containing water at approximately 16°C, with the distance between the bottom of the test tube and the bottom of the beaker being 15 mm. The water is heated at a rate of 2°C per minute until the water temperature reaches 30°C. Then, heating is continued at a rate of 1°C per minute, and the temperature is measured when a drop of the sample leaves the thermometer. This test is performed three times. If the difference in measurements is less than 1°C, the average value is taken. If the difference is 1°C or greater, five measurements are taken and the average value is taken as the melting point. If the average melting point obtained from the measurements is a decimal value, it is rounded to the nearest integer.

[0029] The melting point of the (C) oil agent used in the present invention, which has a melting point of 35°C or higher and 60°C or lower, is preferably 35°C or higher and 50°C or lower, and more preferably 35°C or higher and 45°C or lower. Furthermore, the concentration of the (C) oil agent used in the present invention, which has a melting point of 35°C or higher and 60°C or lower, is preferably 0.05 to 5% by mass when the total amount of the sunscreen cosmetic is 100% by mass, from the viewpoint of enhancing the ultraviolet protection effect. By setting the concentration of the (C) oil agent, which has a melting point of 35°C or higher and 60°C or lower, to 0.05% by mass or higher, skin compatibility is improved, the duration of moisturizing effect is improved, and powderiness when used on dry skin is suppressed, but 0.1% by mass or higher is more preferable, 0.3% by mass or higher is even more preferable, and 0.5% by mass or higher is particularly preferable. Furthermore, (C) by setting the concentration of the oil with a melting point of 35°C or higher and 60°C or lower to 5% by mass or less, the feeling of stickiness is suppressed, but 4% by mass or less is preferred, 3% by mass or less is more preferred, and 1% by mass or less is even more preferred.

[0030] Furthermore, from the viewpoint of enhancing the effects of the present invention, it is preferable that the ratio ((A) / (C)) of the concentration of (A) the ultraviolet scattering agent to the concentration of (C) the oil with a melting point of 35°C or higher and 60°C or lower is in the range of 1 to 60, and more preferably in the range of 1 to 30. By setting the ratio (A) / (C) to 1 or higher, skin compatibility is improved and stickiness can be further reduced. By setting (A) / (C) to 60 or lower, powderiness can be further reduced.

[0031] Furthermore, the ratio ((A) / (B)) of the concentration of (A) the ultraviolet scattering agent to the concentration of (B) the starch-acrylic acid graft polymer salt is preferably in the range of 5 to 800, and more preferably in the range of 30 to 500. By setting the ratio (A) / (B) within this range, powderiness can be further suppressed.

[0032] ((D): At least one of a skin whitening agent and an anti-inflammatory agent) (D) Whitening agents and anti-inflammatory agents may be those that have been conventionally used in topical skin preparations such as cosmetics.

[0033] The whitening agents that may be included in the sunscreen cosmetic according to the present invention are not particularly limited, but it is preferable that they include one or more selected from the group consisting of L-ascorbic acid and its derivatives, tranexamic acid and its derivatives, alkoxysalicylic acid and its derivatives, and nicotinic acid and its derivatives.

[0034] Examples of derivatives of L-ascorbic acid include sodium L-ascorbate, magnesium L-ascorbic acid ester salt, L-ascorbic acid glucoside, 2-O-ethyl-L-ascorbic acid, and 3-O-ethyl-L-ascorbic acid, but among these, L-ascorbic acid glucoside is particularly preferred.

[0035] Examples of tranexamic acid and its derivatives include trans-4-(trans-aminomethylcyclohexanecarbonyl)aminomethylcyclohexanecarboxylic acid hydrochloride, 4-(trans-aminomethylcyclohexanecarboxylic acid 4'-hydroxyphenyl ester), 2-(trans-4-aminomethylcyclohexylcarbonyloxy)-5-hydroxybenzoic acid, trans-4-aminomethylcyclohexanecarboxylic acid methylamide, trans-4-(p-methoxybenzoyl)aminomethylcyclohexanecarboxylic acid, and trans-4-guanidinomethylcyclohexanecarboxylic acid. Among these, tranexamic acid is particularly preferred.

[0036] Examples of alkoxysalicylic acids and their derivatives include 3-methoxysalicylic acid, 3-ethoxysalicylic acid, 4-methoxysalicylic acid, 4-ethoxysalicylic acid, 4-propoxysalicylic acid, 4-isopropoxysalicylic acid, 4-butoxysalicylic acid, 5-methoxysalicylic acid, 5-ethoxysalicylic acid, or 5-propoxysalicylic acid, or salts of these alkoxysalicylic acids. Examples of nicotinic acid derivatives include benzyl nicotinate, nicotinamide, and dl-α-tocopherol nicotinate, among which nicotinamide is particularly preferred.

[0037] Examples of anti-inflammatory agents include glycyrrhizic acid and its derivatives, glycyrrhetinic acid and its derivatives, salicylic acid and its derivatives, and ufenamate. Among these, it is preferable to include glycyrrhizic acid and its derivatives. Examples of glycyrrhizic acid derivatives include dipotassium glycyrrhizate and monoammonium glycyrrhizate, with dipotassium glycyrrhizate being particularly preferred.

[0038] The total amount of whitening agent and anti-inflammatory agent in the sunscreen cosmetic of the present invention is not particularly limited, but is preferably 0.01 to 5% by mass relative to the total amount of the sunscreen cosmetic.

[0039] The formulation of the sunscreen cosmetic of the present invention can take any form known as a cosmetic, pharmaceutical, or quasi-drug. Among such known forms, examples include liquids, suspensions, emulsions, creams, gels, aerosols, sheets impregnated with a medicinal solution (such as nonwoven fabric), and lip emulsions. Of these, liquids, suspensions, emulsions, creams, and gels are preferred in terms of their pleasant feel during use.

[0040] The external composition of the present invention may be an oil-in-water (O / W) composition or a water-in-oil (W / O) composition. Here, an oil-in-water (O / W) composition means an emulsion composition in which the aqueous component is a continuous phase and the oily component is a dispersed phase. A water-in-oil (W / O) composition means an emulsion composition in which the oily component is a continuous phase and the aqueous component is a dispersed phase. When the sunscreen cosmetic of the present invention is an oil-in-water (O / W) composition, water-based emulsions, aqueous gels, and water-based creams are preferred formulations. When the sunscreen cosmetic of the present invention is a water-in-oil (W / O) composition, emulsions and creams are preferred formulations. When the sunscreen cosmetic of the present invention is an emulsion composition, it may be either an oil-in-water (O / W) or water-in-oil (W / O) emulsion composition, but an oil-in-water (O / W) emulsion composition is particularly preferred from the viewpoint of obtaining an even higher UV protection effect.

[0041] Furthermore, the sunscreen cosmetic composition of the present invention may contain additives used in cosmetics, quasi-drugs, pharmaceuticals, etc., as needed, to the extent that they do not impair the effects of the present invention. For example, natural fragrances and synthetic fragrances may be added to enhance palatability. Natural fragrances are essential oils obtained from the flowers, stems, leaves, fruits, peels, and roots of plants by steam distillation, etc., and the separated water can also be used as aromatic water. Synthetic fragrances are not particularly limited and include esters, ethers, aldehydes, ketones, aromatic alcohols, hydrocarbons, etc. Other additives include, for example, glycols such as dipropylene glycol, 1,3-butylene glycol, and polyethylene glycol; glycerins such as diglycerin and polyglycerin; sugar alcohols such as sorbitol and maltitol; liquid oils at room temperature such as hydrocarbon oils, ester oils, silicone oils, and vegetable oils; lower alcohols such as ethanol and isopropanol; sugars such as lactose and sucrose; anionic surfactants such as acylmethyl taurate salts, alkyl ether sulfate salts, and amide ether sulfate salts; organic or inorganic salts such as citrates, malates, and sodium chloride; acids and alkalis as pH adjusters; parabens; preservatives; plant and animal extracts; amino acids; dyes; pigments, etc.

[0042] The method for producing the sunscreen cosmetic of the present invention is not particularly limited and can be prepared by conventional methods. For example, it can be prepared by adding an aqueous component containing component (A), component (B), and component (D) to an oily component containing component (A) and component (C) and emulsifying it. [Examples]

[0043] Using the components listed in Tables 1, 2, and 3, and the common components listed in Table 4, oil-in-water (O / W) type sunscreen cosmetics (Examples 1-13 and Comparative Examples 1-3) were prepared by conventional methods and evaluated as follows.

[0044] The evaluation criteria consisted of five items: "UV protection effect," "skin compatibility," "non-stickiness," "persistence of moisturizing effect under low temperature and low humidity conditions," and "powdery feel when applied to dry skin." These were evaluated according to the evaluation criteria described below.

[0045] (UV protection effect) The resulting sunscreen cosmetic was placed on a PMMA plate at a concentration of 2 mg / cm². 2 After coating the sample at the specified density, the sample was left to stand for 20 minutes under light-shielding conditions, and the SPF was measured using an SPF analyzer (UV-2000S, Labsphere). ○: If the SPF value is 10 or higher. ×: If the SPF value is less than 10.

[0046] (Skin compatibility) Twenty women (ages 25-45) served as panelists, and their ability to absorb sunscreen (2.0g) onto their hands and arms was evaluated according to the following criteria. Specifically, a total score of 35 points or higher was rated "◎" (Excellent), 25-34 points was rated "○" (Good), 15-24 points was rated "△" (Acceptable), and 14 points or lower was rated "×" (Poor). In this evaluation, products rated "◎" (Excellent) and "○" (Good) were considered pass, while those rated "△" (Acceptable) and "×" (Poor) were considered fail. 2 points: It spreads very well, can be applied evenly to the skin, and blends in well. 1 point: When it spreads well, can be applied evenly to the skin, and blends in fairly well. 0 points: If the product doesn't spread well, cannot be applied evenly to the skin, and doesn't blend well with the skin.

[0047] (Non-sticky) Twenty women (ages 25-45) participated as panelists. They applied sunscreen (0.3g) to the inside of their arms and evaluated the lack of stickiness after blending it in with their hands, according to the following criteria. Specifically, a total score of 35 points or higher was rated "◎" (Excellent), 25-34 points was rated "○" (Good), 15-24 points was rated "△" (Acceptable), and 14 points or lower was rated "×" (Poor). Products rated "◎" (Excellent) and "○" (Good) were considered pass, while those rated "△" (Acceptable) and "×" (Poor) were considered fail. 2. The applied area does not feel sticky and does not cause any discomfort. 1 point: The applied area feels slightly sticky, but the discomfort is minimal. 0 points: If you feel stickiness or discomfort in the area where the product was applied.

[0048] (Persistence of moisturizing effect under low temperature and low humidity conditions) Twenty women (ages 25-45) served as panelists. On a clear winter day (December-February) with temperatures below 10°C and humidity below 10%, they applied sunscreen (1g) to the back of their hands and spent three hours outdoors. The duration of the moisturizing effect was evaluated according to the following criteria. Specifically, a total score of 35 points or higher was rated "◎" (Excellent), 25-34 points was rated "○" (Good), 15-24 points was rated "△" (Acceptable), and 14 points or lower was rated "×" (Poor). Products rated "◎" (Excellent) and "○" (Good) were considered pass, while those rated "△" (Acceptable) and "×" (Poor) were considered fail. 2 points: If it provides long-lasting moisturizing effects. 1 point: When the moisturizing effect lasts somewhat longer. 0 points: If the moisturizing effect does not last.

[0049] (Powdery texture when applied to dry skin) Twenty women (ages 25-45) participated as panelists. After applying ethanol to their entire hands and arms, they waited in a room with constant humidity for 20 minutes. Then, they applied sunscreen cosmetic (2g) from their elbows to their wrists and evaluated the powderiness according to the following criteria. Specifically, a total score of 35 points or higher was rated "◎" (Excellent), 25-34 points was rated "○" (Good), 15-24 points was rated "△" (Acceptable), and 14 points or lower was rated "×" (Poor). In this evaluation, "◎" (Excellent) and "○" (Good) were considered passing grades, while "△" (Acceptable) and "×" (Poor) were considered failing grades. 2 points: If you don't feel any dryness or powderiness. 1 point: If it has a slightly dry, powdery texture. 0 points: If the product is very dry and powdery.

[0050] [Table 1]

[0051] [Table 2]

[0052] [Table 3]

[0053] [Table 4]

[0054] Furthermore, the "Notes 1," "2," "3," and "4" shown in Tables 1, 2, and 3 are specifically as follows: Note 1: SSQP50ZJEJ (Primary particle size: 20 nm): Manufactured by KOBO Dispatik Corporation Note 2: SSQP40TIJ (Primary particle size: 10 nm): Manufactured by KOBO Dispatik Corporation Note 3: MT-05 (Primary particle size: 10 nm): Manufactured by Teika Corporation Note 4: Saranjour ST-100SP (average particle size approximately 13 μm): Manufactured by Sanyo Chemical Industries, Ltd.

[0055] The sunscreen cosmetics of Examples 1-13 had UV protection effects, blended well with the skin (highly uniform application), were non-greasy, provided excellent sustained moisturizing effect under low temperature and low humidity conditions, and did not feel powdery when applied to dry skin.

[0056] On the other hand, in Comparative Examples 1-3, sufficient effects were not obtained. In other words, in Comparative Example 1, because ingredient (B) was not included, a sticky feeling occurred, and a powdery texture was felt when applied to dry skin. In Comparative Examples 2 and 3, the melting point of the (C') oil was outside the range of the present invention, resulting in a lack of sustained moisturizing effect under low temperature and low humidity conditions, and also causing stickiness. [Industrial applicability]

[0057] The sunscreen cosmetic of the present invention can be applied to skin such as the face and skin, and provides unique effects that cannot be obtained with conventional sunscreen cosmetics. Specifically, it has sufficient UV protection without stickiness, maintains a moisturizing feeling even in low temperature and low humidity conditions, blends well with the skin, and does not feel powdery when applied even to dry skin, so it is expected to have a wide range of applications in sunscreen cosmetics.

Claims

1. A sunscreen cosmetic characterized by containing (A) an ultraviolet scattering agent, (B) a starch-acrylic acid graft polymer salt, and (C) an oil having a melting point of 35°C or higher and 60°C or lower.

2. Furthermore, (D) the sunscreen cosmetic composition according to claim 1, characterized in that it further comprises at least one of a whitening agent and an anti-inflammatory agent.

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