Stick-shaped sunscreen cosmetic

Abstract

To provide a stick-shaped sunscreen cosmetic which has good moldability, when molded into a stick shape, is excellent in high-temperature stability, after packed in a container, hardly gives an unpleasant feeling, such as stickiness and a squeaky feeling, and hardly changes in spreadability, when used under high-temperature conditions.SOLUTION: The stick-shaped sunscreen cosmetic contains (A) 5-35 mass% of a UV protective agent, (B) 5-30 mass% of a solid oil having a melting point of 60-90 °C, (C) 0.1-10 mass% of a divalent metal salt of a fatty acid having 12-22 carbon atoms, and (D) 40-85 mass% of a liquid oil having a viscosity of 200 mPa·s or less at 25 °C.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a stick-type sunscreen cosmetic. [Background technology]

[0002] The effects of ultraviolet rays on the skin are widely recognized, and people of all ages use sunscreen cosmetics not only for leisure activities but also for daycare. Sunscreen cosmetics are frequently used, especially in the summer when the sun's rays are strong and the amount of ultraviolet light increases. Because people tend to sweat more easily in the summer and outdoor leisure activities such as swimming in the sea are popular, even if sunscreen is applied, it can be washed away by sweat and seawater. For this reason, in order to maintain UV protection, sunscreen cosmetics must be periodically reapplied. Furthermore, there are increasing opportunities for cosmetics carried when going out to be exposed to high temperatures, such as on extremely hot days, and sunscreen cosmetics with good storage stability and ease of use under high-temperature conditions are in demand.

[0003] Furthermore, in recent years, sunscreen cosmetics in the form of a stick, in which the oil is solidified, have also appeared. Stick-type sunscreen cosmetics are characterized by the fact that they do not stain the hands when applied and are easy to reapply when out and about. For example, Patent Document 1 proposes a highly stable stick-type solid cosmetic that contains a UV absorber and a specific oil. In such stick-type sunscreen cosmetics, the UV protection agent has a significant impact on stability and moldability, and in order to achieve a high UV protection effect, the amount of UV protection agent blended must be increased, resulting in an unpleasant finish such as a rough or sticky feeling, or separation of oily components onto the surface of the cosmetic.

[0004] In response to these issues, Patent Document 2 proposes a stick-type cosmetic composition that is excellent in stability, moldability, and usability, and that is formulated with a UV protection agent, silicone resin wax, and volatile silicone oil. However, because the volatile silicone oil is formulated at a high level, when the composition is filled into a stick container, changes in composition due to evaporation under high-temperature storage conditions can cause chipping when the cosmetic is dispensed, and changes in hardness can cause changes in the feel when the cosmetic is spread, resulting in an uncomfortable feel when used by general consumers under certain conditions of actual use, and therefore there is room for improvement in terms of high-temperature stability and usability under high-temperature conditions. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-129281 [Patent Document 2] Japanese Patent Application Publication No. 2023-8324 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, there is a demand for a stick-type sunscreen cosmetic that is easy to mold, has excellent high-temperature stability after being filled into a container, causes little discomfort such as stickiness or a squeaky feeling, and exhibits little change in spreadability when used under high-temperature conditions.

[0007] The object of the present invention is to provide a stick-type sunscreen cosmetic which has good moldability when molded into a stick shape, excellent high-temperature stability after being filled into a container, little unpleasant feeling such as stickiness or squeaky feeling, and furthermore, little change in spreadability when the cosmetic is used under high-temperature conditions. [Means for solving the problem]

[0008] As a result of extensive research in light of the above-mentioned problems, the present inventors have discovered that a stick-type suntan cosmetic that can solve the above-mentioned problems can be obtained by combining, in specified amounts, a UV protection agent, a solid oil having a melting point of 60 to 90°C, a divalent metal salt of a fatty acid having 12 to 22 carbon atoms, and a liquid oil having a viscosity of 200 mPa·s or less at 25°C, and have thus completed the present invention.

[0009] That is, the present invention is as follows. (1) A stick-type sunscreen cosmetic comprising (A) 5 to 35% by mass of an ultraviolet protection agent, (B) 5 to 30% by mass of a solid oil having a melting point of 60 to 90°C, (C) 0.1 to 10% by mass of a divalent metal salt of a fatty acid having 12 to 22 carbon atoms, and (D) 40 to 85% by mass of a liquid oil having a viscosity of 200 mPa·s or less at 25°C.

[0010] (2) (E) A stick-type sunscreen cosmetic according to (1), characterized in that it contains 0.01 to 10% by mass of a fatty acid ester having a viscosity of more than 200 mPa·s at 25°C. [Effects of the Invention]

[0011] The stick-type sunscreen cosmetic of the present invention has good moldability when molded into a stick shape, excellent high-temperature stability after being filled into a container, little unpleasant feeling such as stickiness or a squeaky feeling, and further, there is little change in spreadability when the cosmetic is used under high-temperature conditions. DETAILED DESCRIPTION OF THE INVENTION

[0012] The stick-type sunscreen cosmetic of the present invention contains at least the following components (A), (B), (C) and (D). Each component will be explained below.

[0013] ((A) UV protection agent) Component (A) used in the present invention is an ultraviolet protection agent. An ultraviolet protection agent refers to a substance that can protect the skin and the like from ultraviolet rays by reflecting / scattering or absorbing ultraviolet rays. Examples of ultraviolet protection agents that can be used in the present invention include ultraviolet scattering agents and ultraviolet absorbers.

[0014] Examples of ultraviolet scattering agents include titanium oxide, zinc oxide, iron oxide, zirconium oxide, and aluminum oxide.

[0015] As the ultraviolet scattering agent, these ultraviolet scattering agents may be microparticulated or composited. The titanium oxide and zinc oxide used as the ultraviolet scattering agent may be the titanium oxide and zinc oxide commonly used in cosmetics. Preferably, the stick-type sunscreen cosmetic contains an ultraviolet scattering agent with better dispersibility, or an ultraviolet scattering agent whose surface has been treated, specifically, hydrophobized, by a known method as needed.

[0016] Examples of methods for surface treatment of ultraviolet scattering agents 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; and alkyl phosphate ester treatment.

[0017] The ultraviolet scattering agent is preferably microparticulated to have an average primary particle diameter of 8 to 80 nm, more preferably 10 to 30 nm. The average primary particle diameter can be measured by observing with a transmission electron microscope (TEM), measuring the diameters of any 20 primary particles, and calculating the average value.

[0018] When an ultraviolet scattering agent is used as an ultraviolet protection agent, it is preferable to use titanium oxide and zinc oxide in combination, making two or more kinds. The mass ratio of titanium oxide to zinc oxide is preferably 3:1 to 1:4, and more preferably 2.5:1 to 1:3.

[0019] UV absorbers include t-butyl methoxydibenzoylmethane, ethylhexyl methoxycinnamate (octyl methoxycinnamate), phenyl salicylate, octyl salicylate, homomenthyl salicylate (homosalate), ethylhexyl salicylate, octocrylene, 2-hydroxy-4-methoxybenzophenone, polysilicon-15, ethylhexyl triazone, diethylaminohydroxybenzoyl hexyl benzoate, bisethylhexyloxyphenol methoxyphenyl triazine, oxybenzone-3, methylenebisbenzotriazolyltetramethylbutylphenol, phenylbenzimidazole sulfonic acid, 2,4,6-trianilino-p-(carbo-2'- ethylhexyl-1'-oxy)-1,3,5-triazine, {2-[4-(diethylamino)-2-hydroxybenzoyl]}benzoic acid hexyl ester, 2,4-bis-[{4-(2-ethylhexyloxy)-2-hydroxy}-phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine, and the like.

[0020] When an ultraviolet absorber is used as (A) an ultraviolet protection agent, it is preferable that the ultraviolet absorber contains one or more selected from the group consisting of ethylhexyl methoxycinnamate, homosalate, ethylhexyl salicylate, t-butylmethoxydibenzoylmethane, diethylaminohydroxybenzoylhexylbenzoate, bisethylhexyloxyphenol methoxyphenyl triazine, and octocrylene. In order to obtain a sufficient ultraviolet protection effect, it is more preferable that the ultraviolet absorber contains two or more selected from the group consisting of ethylhexyl methoxycinnamate, t-butylmethoxydibenzoylmethane, and bisethylhexyloxyphenol methoxyphenyl triazine.

[0021] The content of the UV protection agent (A) is 5 to 35% by mass, preferably 7 to 33% by mass, and more preferably 10 to 30% by mass, relative to the total mass of the stick-type sunscreen cosmetic. By making the content of component (A) 5% by mass or more, the sunscreen cosmetic can achieve sufficient UV protection effects. By making the content of component (A) 35% by mass or less, the high-temperature stability is good and discomfort after application can be suppressed.

[0022] In addition, it is preferable to incorporate two or more types of ultraviolet protection agents, and it is more preferable to use an ultraviolet absorber and an ultraviolet scattering agent in combination, because of their high ultraviolet reflection / scattering or absorption effect.

[0023] When two or more UV absorbers are used, it is preferable to use two or more selected from a UV absorber having an absorption maximum at wavelengths of 290 nm or more but less than 320 nm, a UV absorber having an absorption maximum at wavelengths of 320 nm or more but less than 400 nm, and a UV absorber having an absorption maximum at both wavelengths of 290 nm or more but less than 320 nm and 320 nm or more but less than 400 nm. When a UV absorber having an absorption maximum at wavelengths of 290 nm or more but less than 320 nm and a UV absorber having an absorption maximum at wavelengths of 320 nm or more but less than 400 nm are used in combination, the ratio by mass is preferably 2:1 to 6:1, more preferably 2.5:1 to 5:1. Preferred UV absorbers having an absorption maximum at wavelengths of 290 nm or more but less than 320 nm include ethylhexyl methoxycinnamate, homosalate, and ethylhexyl salicylate. Preferred ultraviolet absorbers having an absorption maximum in the wavelength range of 320 nm or more and 400 nm or less include t-butyl methoxydibenzoylmethane and diethylamino hydroxybenzoyl hexyl benzoate. Preferred ultraviolet absorbers having an absorption maximum in the wavelength range of both 290 nm or more and less than 320 nm and 320 nm or more and 400 nm or less include bisethylhexyloxyphenol methoxyphenyl triazine.

[0024] ((B) Solid oil with a melting point of 60-90°C) Component (B) used in the present invention is a solid oil having a melting point of 60°C or higher and 90°C or lower. There are no limitations on the solid oil (B) as long as it is one commonly used in cosmetics, but hydrocarbon waxes and ester waxes are preferred. One or more types of solid oil (B) can be used.

[0025] Specific examples of (B) solid oils include hydrocarbon waxes such as paraffin wax, polyethylene wax, microcrystalline wax, ceresin, and synthetic wax, and ester waxes such as sunflower seed wax, rice wax, candelilla wax, carnauba wax, behenyl behenate, arachidyl behenate, and hydrogenated castor oil. The melting point of the wax can be measured using a differential scanning calorimeter (DSC).

[0026] The content of (B) solid oil is 5 to 30% by mass, preferably 6 to 25% by mass, and more preferably 7 to 20% by mass, based on the total mass of the stick-type sunscreen cosmetic. By setting the content of (B) solid oil to 5% by mass or more, high-temperature stability, minimal discomfort after application, and minimal change in spreadability when the cosmetic is used under high-temperature conditions can be sufficiently achieved. By setting the amount of (B) solid oil to 30% by mass or less, moldability can be improved.

[0027] ((C) Divalent metal salts of fatty acids having 12 to 22 carbon atoms) Component (C) used in the present invention is a divalent metal salt of a fatty acid having at least 12 but no more than 22 carbon atoms. Hereinafter, (C) a divalent metal salt of a fatty acid having 12 to 22 carbon atoms may be simply referred to as a "specific metal salt."

[0028] The (C) specific metal salt may be contained alone or in combination of two or more. The fatty acid may be an unsaturated fatty acid or a saturated fatty acid. The fatty acid may be a branched fatty acid or a straight-chain fatty acid. The fatty acid is preferably a saturated fatty acid, and more preferably a straight-chain fatty acid. The number of carbon atoms in the fatty acid is more preferably 14 or more, and even more preferably 18 or less. The fatty acid is particularly preferably stearic acid.

[0029] The divalent metal is preferably selected from zinc, calcium, and magnesium, and is particularly preferably zinc.

[0030] Specific examples of the (C) specific metal salt 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. Of the above examples, zinc stearate is particularly preferred.

[0031] The (C) specific metal salt is preferably particulate. The particle size of the particulate (C) specific metal salt is not particularly limited, and those commonly used in the cosmetics field can be used, but those with an average primary particle size of 1 to 50 μm are particularly preferred. Two or more (C) specific metal salts with different average primary particle sizes may also be combined. The average primary particle size can be measured by microtrack laser diffraction. Microtrack laser diffraction is a method that uses scattered light obtained by irradiating particles with laser light. In the present invention, a sample can be measured by a wet method in which a surfactant and a specific metal salt are added to water, dispersed by ultrasonic treatment, and then directly introduced into circulating water. The average primary particle size can be measured, for example, using a Microtrack MT-3000 manufactured by Nikkiso Co., Ltd.

[0032] The content of the (C) specific metal salt is 0.1 to 10% by mass, preferably 0.3 to 8% by mass, and more preferably 0.5 to 5% by mass, relative to the total mass of the stick-type sunscreen cosmetic. By setting the content of the (C) specific metal salt to 0.1% by mass or more, discomfort after application is suppressed and changes in spreadability when the cosmetic is used under high-temperature conditions are sufficiently reduced. Furthermore, by setting the content of the (C) specific metal salt to 10% by mass or less, good moldability and high-temperature stability are achieved, and discomfort after application is suppressed.

[0033] ((D) Liquid oil with a viscosity of 200 mPa·s or less at 25°C) Component (D) used in the present invention is a liquid oil with a viscosity of 200 mPa·s or less at 25°C. (D) Liquid oil with a viscosity of 200 mPa·s or less at 25°C is not limited as long as it is selected from the group consisting of polar oils and non-polar oils used in cosmetics. Polar oils include triglycerides (e.g., caprylic / capric triglyceride, triethylhexanoin, triisostearin, olive oil, sunflower oil, rice bran oil) and ester oils (e.g., cetyl ethylhexanoate, ethylhexyl palmitate, alkyl benzoates (C12-C15), isononyl isononanoate). Non-polar oils include hydrocarbon oils (e.g., hydrogenated polyisobutene, mineral oil, light isoparaffin) and silicone oils (e.g., dimethicone, cyclopentasiloxane, methylphenylpolysiloxane).

[0034] (D) Liquid oils having a viscosity of 200 mPa·s or less at 25°C can be contained alone or in combination of two or more types, and it is particularly preferred that the polar oil is a triglyceride and the non-polar oil is a hydrocarbon oil.

[0035] The content of (D) liquid oil having a viscosity of 200 mPa·s or less at 25°C is 40 to 85% by mass, preferably 45 to 80% by mass, and more preferably 50 to 75% by mass, based on the total mass of the stick-type sunscreen cosmetic. By setting the content of (D) liquid oil having a viscosity of 200 mPa·s or less at 25°C to 40% by mass or more, good moldability is achieved, and sufficient stability in elongation can be achieved when the cosmetic is used under high-temperature conditions. Furthermore, by setting the content of (D) liquid oil having a viscosity of 200 mPa·s or less at 25°C to 85% by mass or less, good high-temperature stability can be achieved, and discomfort after application can be suppressed.

[0036] Furthermore, from the viewpoints of moldability, high-temperature stability, minimal discomfort, and minimal change in elongation when the cosmetic is used under high-temperature conditions, the ratio of the total content of (A) the UV protection agent and (C) the specific metal salt to the content of (D) the liquid oil having a viscosity of 200 mPa s or less at 25°C [((A) + (C)) / (D)] is preferably 1 / 12 to 4 / 5 by mass, more preferably 1 / 10 to 3 / 4, and particularly preferably 1 / 8 to 2 / 3.

[0037] ((E) Fatty acid ester with a viscosity of more than 200 mPa·s at 25°C) Component (E) used in the present invention is a fatty acid ester having a viscosity of more than 200 mPa·s at 25°C. Specifically, the (E) fatty acid ester is preferably a viscous liquid fatty acid ester having a viscosity of more than 200 mPa·s at 25°C as measured with a Brookfield rotational viscometer, or a semi-solid fatty acid ester having a melting point of 25°C or higher but not completely solidified at 25°C.

[0038] Examples of (E) fatty acid esters include dipentaerythrityl hexa(hydroxystearate / stearic acid / rosinate), hydrogenated castor oil hydroxystearate, bisdiglyceryl polyacyladipate-2, dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate, dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate, glyceryl tri(caprylate / caprate / myristic acid / stearate), dimer dilinoleyl dimer dilinoleate, trimethylolpropane triisostearate, diisostearyl malate, pentaerythrityl tetraisostearate, glyceryl isostearate, triisostearin, dipentaerythrityl tri-polyhydroxystearate, and pentaerythrityl tetraethylhexanoate.

[0039] The (E) fatty acid ester may be contained either alone or in combination of two or more.

[0040] The content of (E) fatty acid ester is 0.01 to 10% by mass, preferably 0.05 to 8% by mass, and more preferably 0.2 to 6% by mass, relative to the total mass of the stick-type sunscreen cosmetic. By setting the content of component (E) to 0.01% by mass or more, good high-temperature stability and a lack of discomfort after application can be sufficiently achieved. Furthermore, by setting the content of component (E) to 10% by mass or less, discomfort after application can be suppressed and changes in spreadability when the cosmetic is used under high-temperature conditions can be reduced.

[0041] (additives) In addition to the above components (A) to (E), the stick-type sunscreen cosmetic of the present invention may contain, if necessary, additives used in cosmetics, quasi-drugs, pharmaceuticals, etc., within the scope of the invention. The total content of such additives is preferably 15% by mass or less, and more preferably 10% by mass or less, of the total mass of the stick-type sunscreen cosmetic.

[0042] Such additives include surfactants, moisturizers, preservatives, antioxidants, perfumes, and the like.

[0043] Examples of surfactants include sorbitan fatty acid esters such as sorbitan oleate, sorbitan sesquioleate, and sorbitan isostearate; glycerin (polyglycerin) fatty acids such as glyceryl stearate and polyglyceryl monooleate; polyoxyethylene hydrogenated castor oils such as PEG-40 hydrogenated castor oil and PEG-60 hydrogenated castor oil; fatty acid polyoxyethylene sorbitans such as polysorbate 60 and polysorbate 80; and polyoxyethylene alkyl ethers such as steareth-2, steareth-20, oleth-2, and oleth-15.

[0044] Examples of moisturizing agents include polyethylene glycol, glycerin, 1,3-butylene glycol, 1,3-propanediol, 1,2-pentylene glycol, ethylhexylglycerin, sorbitol, and maltitol.

[0045] Examples of preservatives include methylparaben, ethylparaben, butylparaben, phenoxyethanol, etc. Examples of antioxidants include tocopherols, etc. Examples of fragrances include natural fragrances such as essential oils obtained by steam distillation or the like from the flowers, stems, leaves, fruits, peels, and roots of plants, and synthetic fragrances such as esters, ethers, aldehydes, ketones, aromatic alcohols, and hydrocarbons.

[0046] (Manufacturing method) The stick-type sunscreen cosmetic of the present invention is prepared by dispersing, melting, and mixing the above-mentioned components to obtain a semi-finished product, which is poured into a desired mold or container and cooled to solidify, thereby forming the product into a stick shape. The mixing method is not particularly limited, and any conventional method can be used. For example, a stick-type sunscreen cosmetic can be produced by mixing, dispersing, and dissolving (A) an ultraviolet protection agent and (C) a specific metal salt in (D) a liquid oil having a viscosity of 200 mPa·s or less at 25°C, followed by mixing and dissolving (B) a solid oil at 70 to 100°C, followed by filling and cooling to solidify. [Example]

[0047] (Manufacturing method) (D) (A) UV protection agent and (C) specific metal salt are added to liquid oil having a viscosity of 200 mPa·s or less at 25°C, and the mixture is dispersed uniformly using a disperser to obtain (1) dispersion. (1) The dispersion and (B) the solid oil are mixed uniformly at 90°C to obtain (2) a mixture. (2) The mixture was poured into a direct-fill stick container (ST-15, manufactured by GLASEL Co., Ltd.), cooled and solidified at room temperature, and the surface was remelted to obtain a stick-type sunscreen cosmetic.

[0048] (Evaluation method) (Moldability) The solidification state of the cosmetic material when filled into the container was confirmed by visual evaluation. Evaluation criteria : ◎: Sufficient fluidity during filling, with little solidification of the cosmetic at the spout ○: Fluidity is good when filling, and the amount of solidification of the cosmetic at the spout is slightly small ×: Poor fluidity during filling, and a large amount of cosmetic solidified at the spout

[0049] (high temperature stability) The stick-type sunscreen cosmetic composition after cooling and solidifying was stored at 50°C for one month, and then dispensed five times, after which the condition was visually evaluated. Evaluation criteria: ◎: No chipping or crumbling of makeup, no oil separation ○: Almost no chipping or crumbling of makeup, and almost no separation of oil ×: Cosmetics chipped or crumbled, or oil separation was observed

[0050] (Less discomfort after application) Twenty women (aged 23 to 55) were used as panelists, and the stick-type sunscreen cosmetics of the Examples and Comparative Examples were applied to a 3×3 cm area on the forearm. 2 The discomfort felt after the spread cosmetic was blended was scored according to the following evaluation criteria. The total points of the evaluation scores of the 20 panelists were calculated, and a stick-type sunscreen cosmetic with a total score of 20 points or more was judged to be one that caused little discomfort after blending.

[0051] Evaluation criteria : 2 points: If you feel that there is little stickiness or discomfort after blending 1 point: If you feel slight discomfort such as stickiness or a squeaky feeling after blending 0 points: If you feel any discomfort such as stickiness or a squeaky feeling after blending Total points : ◎: Total score is 30 or more 〇: Total score is between 20 and 30 points △: Total score is between 10 and 20 points ×: Total points are less than 10 points

[0052] (Low change in elongation when using cosmetics under high temperature conditions) Twenty women (aged 23 to 55) were used as panelists, and the stick-type sunscreen cosmetics of the Examples and Comparative Examples were applied to a 3×3 cm area on the forearm. 2 The patient was then placed in a constant temperature and humidity chamber at 40°C and 70% humidity for 30 minutes to acclimate. After that, the stick-type sunscreen cosmetic that had been stored at 40°C for one day was again applied to a 3 x 3 cm area on the forearm. 2The stick-type sunscreen cosmetic was then stored for one day in a constant temperature and humidity room at 25°C and 50% humidity, and the spreadability of the product was compared with that of the product when used in the same manner. The scores were calculated based on the following evaluation criteria. The total scores of the 20 panelists were calculated. A total score of 20 or more was determined to be a stick-type sunscreen cosmetic that showed little change in spreadability when reapplied after sweating.

[0053] Evaluation criteria : 2 points: If you feel that there is little change in spreadability when applying 1 point: If you feel a slight change in spreadability when applying 0 points: If you feel a change in spreadability when applying Total points : ◎: Total score is 30 or more Yes: The total score is 20 or more but less than 30 points △: The total score is 10 or more but less than 20 points ×: The total score is less than 10 points

[0054] The compositions and evaluation results of Examples 1 to 11 and Comparative Examples 1 to 4 are shown in Table 1. The compositions shown in Table 1 indicate the ratio (% by mass) of each component to the total mass of the cosmetic.

[0055] [Table 1]

[0056] [Table 2]

[0057] [Table 3]

[0058] The materials used in the stick-type sunscreen cosmetic are as follows: Ethylhexyl methoxycinnamate: BASF Japan Ltd. "Uvinul (registered trademark) MC 80" t-Butyl methoxydibenzoylmethane: DSM Co., Ltd. "Parsol (registered trademark) 1789" Bis-ethylhexyloxyphenol methoxyphenyl triazine: BASF Japan Ltd. "Tinosorb(R) S" Titanium oxide: "MT-100Z" manufactured by Teika Corporation, average primary particle size 15 nm Zinc oxide: Teika Corporation "MZY-505EX", average primary particle size 25 nm Synthetic wax: Nippon Seiro Co., Ltd. "FNP-0080", melting point 81°C Sunflower seed wax: "TOWAX-6F2" manufactured by Toa Kasei Co., Ltd., melting point 73.5-79.5°C Zinc stearate: "Zinc stearate plant extract" manufactured by NOF Corporation Calcium stearate: NOF Corporation "Calcium stearate plant extract" Zinc myristate: NOF Corporation "Powder Base M" Hydrogenated polyisobutene: NOF Corporation "Pearleam (registered trademark) 6" Cetyl ethylhexanoate: BASF Japan Ltd. "Cetiol (registered trademark) SN-1" Caprylic / capric triglyceride: NOF Corporation "Panasate 810S"

[0059] All of the samples of Examples 1 to 11 were stick-type sunscreen cosmetics that exhibited good moldability, high-temperature stability, and little discomfort after application, and also showed little change in elongation when used under high-temperature conditions.

[0060] On the other hand, in Comparative Example 1, the content of component (B) was high and the content of component (D) was insufficient, resulting in insufficient moldability and minimal change in elongation when the cosmetic was used under high temperature conditions. In Comparative Example 2, component (C) was not included, and therefore the discomfort felt after application and the change in spreadability when the cosmetic was used under high temperature conditions were insufficient. In Comparative Example 3, the content of component (C) was high, and therefore the reduction in discomfort after application was insufficient. In Comparative Example 4, the content of component (A) was high, and therefore high-temperature stability, minimal discomfort after blending, and minimal change in spreadability when the cosmetic was used under high-temperature conditions were insufficient. [Industrial Applicability]

[0061] The stick-type sunscreen cosmetic of the present invention can be applied to the skin, such as the face or skin, and has unique effects that cannot be obtained with conventional stick-type sunscreen cosmetics, specifically, good moldability, high-temperature stability, little discomfort after blending, and little change in spreadability when the cosmetic is used under high-temperature conditions, and therefore is expected to be applicable to sunscreen cosmetics, makeup bases, etc.

Claims

1. A stick-type sunscreen cosmetic comprising (A) 5 to 35 mass% of an ultraviolet protection agent, (B) 5 to 30 mass% of a solid oil having a melting point of 60 to 90°C, (C) 0.1 to 10 mass% of a divalent metal salt of a fatty acid having 12 to 22 carbon atoms, and (D) 40 to 85 mass% of a liquid oil having a viscosity of 200 mPa s or less at 25°C.

2. 2. The stick-type sunscreen cosmetic according to claim 1, comprising (E) 0.01 to 10% by mass of a fatty acid ester having a viscosity at 25°C of more than 200 mPa·s.

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