Cosmetic

Abstract

To provide a cosmetic containing a composite powder of titanium oxide and 4-tert-butyl-4' - methoxydibenzoylmethane, and ethylhexyl methoxycinnamate, and excellent in ultraviolet screening effect and stability with time.SOLUTION: A cosmetic comprising: a composite powder of titanium oxide and 4-tert-butyl-4' - methoxydibenzoylmethane; and ethylhexyl methoxycinnamate, wherein a content of the composite powder is 3.0 mass% to 30.0 mass% with respect to a total mass of the cosmetic, and a content ratio of the ethylhexyl methoxycinnamate to the composite powder is 0.10 to 0.80 on a mass basis.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to cosmetics. [Background technology]

[0002] Ultraviolet rays cause photoaging such as wrinkles, sagging, and dullness of the skin. Therefore, various techniques have been proposed to incorporate ultraviolet protection agents into topical skin preparations such as cosmetics in order to improve the ultraviolet blocking effect of the preparations.

[0003] Patent Document 1 discloses a water-in-oil cosmetic that contains an oil agent containing silicone oil, a modified silicone surfactant with a hydrophilic-lipophilic balance value of less than 6, at least one ultraviolet protection agent selected from the group consisting of ultraviolet absorbers and ultraviolet scattering agents, a water-absorbing polymer in an amount of more than 0% by mass and not more than 5% by mass relative to the total amount of the water-in-oil cosmetic, and water.

[0004] Patent Document 2 discloses a sunscreen cosmetic comprising (A): a UVA absorber, (B): a UVB absorber, (C): a photoresponsive capsule comprising a wall membrane containing at least one DNA and at least a portion of which is decomposed by irradiation with light, and an oil-soluble antioxidant component encapsulated in the wall membrane, (D): at least one ester oil that is liquid at 20°C selected from the group consisting of isopropyl lauroyl sarcosine, caprylic / capric triglyceride, diisopropyl sebacate, and diethyl sebacate, and (E): water, wherein the content of (B) relative to the total weight of the sunscreen cosmetic is 1% by mass or more and 3% by mass or less, and the total content of the ester oils including (D) relative to the total weight of the sunscreen cosmetic is 1% by mass or more and 10% by mass or less.

[0005] Patent document 3 discloses the use of a composite material comprising nanoparticles of at least one metal derivative and at least one organic sun filter derivative covalently chemically bonded to the nanoparticles in the form of an ultraviolet protection agent. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-38781 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-8433 [Patent Document 3] Japanese Patent Application Laid-Open No. 2009-503040 Summary of the Invention [Problem to be solved by the invention]

[0007] Cosmetics intended to protect against ultraviolet rays, such as sunscreen cosmetics, must contain a necessary and sufficient amount of ultraviolet protection agent to achieve a high ultraviolet protection effect. Examples of ultraviolet protection agents include organic ultraviolet absorbers and inorganic ultraviolet scattering agents (e.g., inorganic powders such as titanium oxide and zinc oxide). Composite powders obtained by combining inorganic powders with ultraviolet absorbers that are organic compounds are also known.

[0008] Because composite powders of titanium oxide and organic UV absorbers have a high UV absorption effect, they are useful in cosmetics where a high UV shielding effect is desired, and various improvements have been made to cosmetics containing such composite powders. Among organic UV absorbers, 4-tert-butyl-4'-methoxydibenzoylmethane (also known as avobenzone) is particularly capable of absorbing long-wave UV rays more than any other UV absorber that can be used in cosmetics, making it ideal as a UV absorber to be composited with inorganic powders.

[0009] However, incorporating a large amount of titanium oxide and 4-tert-butyl-4'-methoxydibenzoylmethane composite powder (hereinafter also referred to as "avobenzone composite titanium oxide") into a cosmetic product can worsen the feel during use. Therefore, to further improve UV protection, it is desirable to use avobenzone composite titanium oxide in combination with other UV protection agents. The incorporation of inorganic UV scattering agents, such as inorganic powders like titanium oxide and zinc oxide, into a cosmetic product can cause a rough feeling due to the presence of the powder, thereby worsening the feel during use. Therefore, when combining avobenzone composite titanium oxide with other UV protection agents to improve UV protection, the incorporation of organic UV absorbers is preferred over inorganic UV scattering agents. On the other hand, many organic UV absorbers are oil-soluble and solid, and dissolving oil-soluble, solid UV absorbers requires the use of highly polar ester oils. However, the incorporation of ester oils in a cosmetic product can cause a greasy feel during use, which is undesirable.

[0010] Since ethylhexyl methoxycinnamate is a liquid ultraviolet absorber, it is conceivable to use avobenzone complex titanium oxide and ethylhexyl methoxycinnamate to improve the ultraviolet protection effect and achieve a good feeling in use. However, since ethylhexyl methoxycinnamate also functions as a solvent for dissolving solid ultraviolet absorbers, the combined use of ethylhexyl methoxycinnamate and avobenzone complex titanium oxide can cause problems such as the generation of precipitates due to the avobenzone dissolving and recrystallizing from the avobenzone complex titanium oxide over time in cosmetics, and syneresis of cosmetics constituted as an emulsion.

[0011] The present disclosure has been made in consideration of the above circumstances. An object of one embodiment of the present disclosure is to provide a cosmetic that contains a composite powder of titanium oxide and 4-tert-butyl-4'-methoxydibenzoylmethane, and ethylhexyl methoxycinnamate, and that has excellent UV blocking effect and stability over time. [Means for solving the problem]

[0012] The present disclosure includes the following aspects.

[0013] <1> A cosmetic comprising a composite powder of titanium oxide and 4-tert-butyl-4'-methoxydibenzoylmethane, and ethylhexyl methoxycinnamate, wherein the content of the composite powder is 3.0% by mass to 30.0% by mass relative to the total mass of the cosmetic, and the content ratio of the ethylhexyl methoxycinnamate to the composite powder is 0.10 to 0.80 by mass. <2> The content of the composite powder is 3.0% by mass or more and 21.0% by mass or less relative to the total mass of the cosmetic. <1> The cosmetic composition according to claim 1. <3> Further containing a solid oil-soluble ultraviolet absorber, <1> or <2> The cosmetic composition according to claim 1. <4> Further containing water-dispersible ultraviolet absorber particles, <1> ~ <3> A cosmetic composition according to any one of the above. <5> Further containing zinc oxide, <1> ~ <4> A cosmetic composition according to any one of the above. <6> It is a water-in-oil cosmetic. <1> ~ <5> A cosmetic composition according to any one of the above. <7> It is a sunscreen cosmetic. <1> ~ <6> The cosmetic composition according to any one of the preceding claims [Effects of the Invention]

[0014] According to one embodiment of the present disclosure, a cosmetic can be provided that contains a composite powder of titanium oxide and 4-tert-butyl-4'-methoxydibenzoylmethane, and ethylhexyl methoxycinnamate, and that has excellent UV blocking effect and stability over time. DETAILED DESCRIPTION OF THE INVENTION

[0015] An example of an embodiment of the cosmetic according to the present disclosure will be described in detail below.

[0016] In the present disclosure, a numerical range indicated using "to" means a range that includes the numerical values ​​before and after "to" as the minimum and maximum values, respectively. In the numerical ranges described in stages in the present disclosure, the upper or lower limit value described in a certain numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. Furthermore, in the numerical ranges described in the present disclosure, the upper or lower limit value described in a certain numerical range may be replaced with a value shown in the examples. In the present disclosure, the amount of each component in a cosmetic refers to the total amount of multiple substances present in the cosmetic, unless otherwise specified, when multiple substances corresponding to each component are present in the cosmetic. In the present disclosure, a combination of two or more preferred embodiments is a more preferred embodiment. In the present disclosure, "oil phase" means the continuous phase in a water-in-oil formulation, or the dispersed phase in an oil-in-water formulation, and includes the liquid medium of the oil phase and any components dispersed or dissolved in that liquid medium. In this disclosure, "aqueous phase" means the dispersed phase in a water-in-oil dosage form, or the continuous phase in an oil-in-water dosage form, and includes the liquid medium of the dispersed phase and any components dispersed or dissolved in that liquid medium. In the present disclosure, "mass %" and "weight %" are synonymous.

[0017] In the present disclosure, a cosmetic having "excellent stability over time" means that the properties of the cosmetic are maintained for a specified period of time. Factors that impair the properties of a cosmetic include the formation of precipitates, precipitation of crystals, syneresis, etc. The specified period may be the storage period set for the cosmetic.

[0018] [Cosmetics] The cosmetic according to the present disclosure contains a composite powder of titanium oxide and 4-tert-butyl-4'-methoxydibenzoylmethane (avobenzone composite titanium oxide), and ethylhexyl methoxycinnamate, wherein the content of the avobenzone composite titanium oxide is 3.0% by mass to 30.0% by mass relative to the total mass of the cosmetic, and the content ratio of the ethylhexyl methoxycinnamate to the avobenzone composite titanium oxide is 0.10 to 0.80 by mass.

[0019] The cosmetic according to the present disclosure contains avobenzone complex titanium oxide and ethylhexyl methoxycinnamate, and has excellent UV blocking effect and stability over time.

[0020] The cosmetic according to the present disclosure is preferably an emulsion composition, which may be an oil-in-water emulsion composition (O / W emulsion composition) or a water-in-oil emulsion composition (W / O emulsion composition), and can be selected depending on the intended use of the cosmetic.

[0021] From the viewpoint of stably containing an ultraviolet absorbing component such as avobenzone complex titanium oxide, the cosmetic according to the present disclosure is preferably a water-in-oil emulsion composition (W / O emulsion composition), more preferably a water-in-oil cosmetic (W / O cosmetic).

[0022] When the cosmetic according to the present disclosure is an oil-in-water emulsion composition (O / W emulsion composition) or a water-in-oil emulsion composition (W / O emulsion composition), from the viewpoint of suppressing changes over time on the application surface, the ratio of aqueous phase to oil phase, by mass, is preferably 10 / 90 to 30 / 70, more preferably 20 / 80 to 60 / 40, and even more preferably 25 / 75 to 45 / 55.

[0023] The combined use of avobenzone complex titanium dioxide and ethylhexyl methoxycinnamate is expected to provide excellent UV protection. However, as mentioned above, cosmetics containing avobenzone complex titanium dioxide and ethylhexyl methoxycinnamate can suffer from problems such as the formation of precipitates, precipitation of crystals, and syneresis over time.

[0024] In contrast, the cosmetic according to the present disclosure contains avobenzone complex titanium oxide and ethylhexyl methoxycinnamate, and the content of avobenzone complex titanium oxide is 3.0% by mass to 30.0% by mass relative to the total mass of the cosmetic, and the content ratio of ethylhexyl methoxycinnamate to the specific complex powder is 0.10 to 0.80 by mass. Therefore, even though the cosmetic contains avobenzone complex titanium oxide and ethylhexyl methoxycinnamate, it has excellent UV blocking effect and stability over time.

[0025] On the other hand, the aforementioned Patent Document 1 (JP 2019-38781 A), Patent Document 2 (JP 2016-8433 A), and Patent Document 3 (JP 2009-503040 A) do not pay attention to improving the UV blocking effect and stability over time in cosmetics containing avobenzone complex titanium oxide and ethylhexyl methoxycinnamate.

[0026] Patent Document 1 describes an example of a water-in-oil cosmetic that combines ultraviolet absorber-coated titanium dioxide with polysilicone-15, a liquid, oil-soluble ultraviolet absorber. However, polysilicone-15 has a weaker function as a solvent for dissolving ultraviolet absorbers than ethylhexyl methoxycinnamate. Therefore, even when ultraviolet absorber-coated titanium dioxide and polysilicone-15 are used together, polysilicone-15 does not function as a solvent for dissolving ultraviolet absorbers, and problems such as the ultraviolet absorber dissolving from the ultraviolet absorber-coated titanium dioxide do not occur. Patent Document 3 describes a combination of a composite powder of titanium oxide and hydroxymethoxybenzophenone sulfonic acid with ethylhexyl methoxycinnamate. However, hydroxymethoxybenzophenone sulfonic acid is water-soluble. Therefore, even when a composite powder of titanium oxide and hydroxymethoxybenzophenone sulfonic acid is used together with ethylhexyl methoxycinnamate, problems such as the hydroxymethoxybenzophenone sulfonic acid dissolving from the composite powder do not occur.

[0027] The components contained in the cosmetic composition according to the present disclosure will be described in detail below.

[0028] <Composite powder of titanium oxide and 4-tert-butyl-4'-methoxydibenzoylmethane (avobenzone composite titanium oxide)> The cosmetic according to the present disclosure contains a composite powder of titanium oxide and 4-tert-butyl-4'-methoxydibenzoylmethane (avobenzone composite titanium oxide).

[0029] The cosmetic according to the present disclosure may contain one type of avobenzone complex titanium oxide alone, or may contain two or more types.

[0030] By containing avobenzone complex titanium oxide, the cosmetic composition according to the present disclosure can improve the effectiveness of blocking ultraviolet rays (UVA region and / or UVB region) that are harmful to the skin.

[0031] The titanium oxide constituting the avobenzone-complex titanium oxide is not particularly limited, and may be titanium oxide of any crystalline type, such as anatase type, rutile type, brookite type, etc. From the viewpoint of improving the ultraviolet ray shielding ability, the crystalline type of titanium oxide is preferably rutile type.

[0032] Titanium oxide may be surface-treated with an inorganic substance such as aluminum hydroxide, silicon oxide, or zirconium oxide, or may be surface-treated with a fatty acid such as stearic acid, isostearic acid, or lauric acid, or may be surface-treated with both an inorganic substance and a fatty acid. By surface-treating titanium oxide with an inorganic substance such as aluminum hydroxide, the titanium oxide can be inactivated. Furthermore, by surface-treating titanium oxide with a fatty acid such as stearic acid, the surface of titanium oxide can be made hydrophobic.

[0033] From the viewpoint of UV-shielding effect and transparency of the cosmetic, the average primary particle diameter of titanium oxide is, for example, preferably 1 nm to 90 nm, and more preferably 5 nm to 50 nm. The average primary particle diameter of titanium oxide is determined by photographing 1,000 or more particles with a transmission electron microscope, processing the images of each photographed particle using an image analysis particle size distribution analyzer, and measuring the circle-equivalent diameter. When using a commercially available titanium oxide product, the average primary particle diameter listed in the catalog or the like can be used as is.

[0034] In the avobenzone-complexed titanium oxide, the ultraviolet absorber combined with titanium oxide is 4-tert-butyl-4'-methoxydibenzoylmethane, from the viewpoint of its ability to block ultraviolet rays in the UVA region or thereabouts. Note that 4-tert-butyl-4'-methoxydibenzoylmethane will be referred to as avobenzone, its alternative name, where appropriate.

[0035] The avobenzone-complex titanium oxide preferably has a surface treatment layer containing avobenzone on the surface of the titanium oxide. The surface treatment layer is preferably present on the entire surface of the titanium oxide, but there may be areas where the surface treatment layer is not present. The bonding mode between the titanium oxide surface (when the titanium oxide is surface-treated with at least one of an inorganic substance and a fatty acid, the inorganic substance or fatty acid disposed on the surface) and avobenzone is not particularly limited as long as the titanium oxide and avobenzone behave as a single entity, and may be a chemical bond such as a covalent bond, or a non-chemical bond such as adsorption.

[0036] The presence of avobenzone on the surface of titanium oxide can be confirmed by measuring the reflectance spectrum of the avobenzone-complex titanium oxide.

[0037] The ratio of titanium oxide to avobenzone in the avobenzone-complex titanium oxide is not particularly limited. From the viewpoint of ultraviolet ray shielding ability, for example, it can be 0.03 to 1 part by mass of avobenzone per 1 part by mass of titanium oxide.

[0038] The average particle size of the avobenzone complex titanium oxide is preferably less than 1 μm. If the average particle size of the avobenzone complex titanium oxide is less than 1 μm, coloration of the cosmetic due to the avobenzone complex titanium oxide itself is suppressed, and the so-called white cast is less likely to occur. From the viewpoints of UV shielding effect and usability, the average particle size of the avobenzone complex titanium oxide is more preferably 1 nm to 500 nm, and even more preferably 3 nm to 100 nm. The average particle size of avobenzone-complex titanium oxide can be measured by the same method as for the average primary particle size of titanium oxide.

[0039] The avobenzone complex titanium oxide may be, for example, the composite powder disclosed in International Publication No. 2010 / 098249. Avobenzone complex titanium oxide is also commercially available. Examples of commercially available composite powders include HXMT-100ZA and HXMT-10EXA from Teika Corporation. HXMT-100ZA is a titanium oxide surface-treated with aluminum hydroxide and stearic acid, on which a surface-treated layer containing 4-tert-butyl-4'-methoxydibenzoylmethane is formed. HXMT-10EXA is a titanium oxide surface-treated with aluminum hydroxide and isostearic acid, on which a surface-treated layer containing 4-tert-butyl-4'-methoxydibenzoylmethane is formed.

[0040] The content of avobenzone complex titanium oxide is 3.0% by mass to 30.0% by mass relative to the total mass of the cosmetic, and from the viewpoint of further improving the UV blocking ability and the feeling of use, it is preferably 3.0% by mass to 21.0% by mass, and more preferably 3.0% by mass to 18.0% by mass.

[0041] When the cosmetic is an emulsion, the avobenzone complex titanium oxide may be contained in either the oil phase or the water phase. From the viewpoints of improving the water resistance, feel in use (smoothness, refreshing feeling), and UV shielding effect of the cosmetic, it is preferable that the avobenzone complex titanium oxide be contained in the oil phase.

[0042] For example, when avobenzone complex titanium oxide is blended into the oil phase, a slurry may be prepared using an oil such as silicone oil, and the slurry may be blended with other components. The content of the avobenzone complex titanium oxide in the slurry is not particularly limited. In general, the content of the complex powder in the slurry is preferably 10% by mass to 80% by mass, and more preferably 20% by mass to 60% by mass, of the total mass of the slurry. If the content of the avobenzone complex titanium oxide in the slurry is within the above range, the avobenzone complex titanium oxide tends to be stably contained in the cosmetic.

[0043] <Ethylhexyl methoxycinnamate> The cosmetic composition according to the present disclosure contains ethylhexyl methoxycinnamate. Ethylhexyl methoxycinnamate has excellent UVB radiation blocking properties, and therefore, by containing both avobenzone complex titanium oxide and ethylhexyl methoxycinnamate, the cosmetic composition according to the present disclosure can block UVA and UVB radiation in a balanced manner.

[0044] Furthermore, since ethylhexyl methoxycinnamate also functions as a solvent for dissolving solid ultraviolet absorbers, when the cosmetic composition according to the present disclosure further contains a solid, oil-soluble ultraviolet absorber described below as another ultraviolet absorber, it can also function well as a dissolving solvent for that absorber.

[0045] In the cosmetic according to the present disclosure, the content ratio of ethylhexyl methoxycinnamate to avobenzone complex titanium oxide is, by mass, 0.10 to 0.80, and more preferably 0.20 to 0.80. When the content ratio of ethylhexyl methoxycinnamate to avobenzone complex titanium oxide is 0.10 to 0.80, elution of avobenzone from the avobenzone complex titanium oxide is effectively suppressed.

[0046] <Other UV absorbers> From the viewpoint of further improving the UV-shielding effect, the cosmetic according to the present disclosure preferably contains, in addition to the avobenzone complex titanium oxide and ethylhexyl methoxycinnamate, another UV absorber, such as a solid oil-soluble UV absorber or water-dispersible UV absorber particles.

[0047] -Solid oil-soluble UV absorber- From the viewpoint of further improving the ultraviolet shielding effect, the cosmetic according to the present disclosure preferably further contains a solid oil-soluble ultraviolet absorber. Note that the solid oil-soluble ultraviolet absorber contained in the cosmetic according to the present disclosure as another ultraviolet absorber does not include a form in which a solid oil-soluble ultraviolet absorber is combined with an inorganic powder.

[0048] In the present disclosure, an ultraviolet absorber being "solid" means that the ultraviolet absorber is in the form of a solid that does not flow or deform under its own weight under conditions of atmospheric pressure and standard temperature (Japanese Pharmacopoeia: 20°C), or in the form of a paste that does not flow or deform under its own weight.

[0049] In the present disclosure, the term "oil-soluble ultraviolet absorber" refers to an ultraviolet absorber that is dissolved in an amount of 1 part by mass or more in 100 parts by mass of ethylhexyl methoxycinnamate at a liquid temperature of 20°C.

[0050] Examples of solid oil-soluble ultraviolet absorbers include 4-tert-butyl-4'-methoxydibenzoylmethane, diethylaminohydroxybenzoylhexylbenzoate, 2,4-bis-[{4-(2-ethylhexyloxy)-2-hydroxy}-phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine, and 2,4,6-tris(4-(2-ethylhexyloxycarbonyl)anilino)-1,3,5-triazine.

[0051] In the cosmetic according to the present disclosure, the content of the solid oil-soluble ultraviolet absorber is preferably 0.5% by mass to 10% by mass relative to the total mass of the cosmetic, from the viewpoints of ultraviolet shielding ability and usability.

[0052] -Water-dispersible UV absorber particles- From the viewpoint of further improving the ultraviolet shielding effect, the cosmetic according to the present disclosure preferably further contains water-dispersible ultraviolet absorber particles.

[0053] In the present disclosure, "water-dispersible ultraviolet absorber particles" refers to particles of an oil-soluble ultraviolet absorber having a particle diameter of 1000 nm or less and exhibiting dispersibility in water at a liquid temperature of 20° C. The water-dispersible ultraviolet absorber particles may be in either a form obtained by pulverizing an oil-soluble ultraviolet absorber into fine particles or a form obtained by encapsulating an oil-soluble ultraviolet absorber in microcapsules.

[0054] The particle size of the water-dispersible ultraviolet absorber particles is defined as the value obtained by photographing 1,000 or more zinc oxide particles using a transmission electron microscope, processing the images of each of the photographed particles using an image analysis type particle size distribution measuring device, and measuring the circle-equivalent diameter. When a commercially available product is used as the water-dispersible ultraviolet absorbent particles, the particle size described in the catalog or the like can be applied as is.

[0055] Examples of water-dispersible ultraviolet absorber particles include 2,4-bis-[{4-(2-ethylhexyloxy)-2-hydroxy}-phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine and methylenebisbenzotriazolyltetramethylbutylphenol particles. The water-dispersible ultraviolet absorber particles can be blended into cosmetics in the form of finely dispersed particles in water.

[0056] From the viewpoint of ultraviolet shielding ability and usability, the water-dispersible ultraviolet absorber particles are preferably particles of methylenebisbenzotriazolyltetramethylbutylphenol.

[0057] In the cosmetic according to the present disclosure, the content of the water-dispersible ultraviolet absorber particles is preferably 0.1% by mass to 10% by mass, more preferably 0.3% by mass to 6% by mass, and even more preferably 0.5% by mass to 3% by mass, relative to the total mass of the cosmetic.

[0058] <Zinc oxide> The cosmetic according to the present disclosure preferably further contains zinc oxide. The zinc oxide is not particularly limited as long as it is zinc oxide that can be used in cosmetics. Zinc oxide can function as an ultraviolet light scattering agent.

[0059] The zinc oxide is preferably in the form of powder. The average primary particle size of zinc oxide is not particularly limited, but is preferably 1 nm to 90 nm, and more preferably 5 nm to 50 nm, from the viewpoint of UV blocking ability and transparency of the cosmetic preparation. The average primary particle diameter of zinc oxide is determined by photographing 1,000 or more zinc oxide particles using a transmission electron microscope, processing the images of each photographed particle using an image analysis type particle size distribution analyzer, and measuring the circle equivalent diameter. When a commercially available zinc oxide is used, the average primary particle size listed in the catalog or the like can be applied as is.

[0060] The zinc oxide may be one in which a part of the surface of the zinc oxide is surface-treated, or one in which the entire surface of the zinc oxide is surface-treated.

[0061] A preferred embodiment of the zinc oxide comprises at least one zinc oxide (A) selected from the group consisting of zinc oxide (a1) surface-treated with a fatty acid and zinc oxide (a2) surface-treated with an alkylalkoxysilane.

[0062] In zinc oxide (a1), the fatty acid used for surface treatment of zinc oxide is not particularly limited, but from the viewpoint of dispersion stability, it is preferably a fatty acid having 10 to 22 carbon atoms, more preferably a fatty acid having 12 to 20 carbon atoms, even more preferably a fatty acid having 16 to 20 carbon atoms, particularly preferably stearic acid and / or isostearic acid, which are fatty acids having 18 carbon atoms, and most preferably isostearic acid. That is, zinc oxide (A) is most preferably zinc oxide surface-treated with isostearic acid. The term "fatty acid" as used herein includes fatty acids and their salts. Examples of salts include Ca salts, Mg salts, Zn salts, and Al salts.

[0063] The surface treatment of zinc oxide with a fatty acid can be carried out, for example, by mixing and stirring zinc oxide in a fatty acid for a certain period of time.

[0064] In the zinc oxide (a2), the alkylalkoxysilane used for the surface treatment of zinc oxide is not particularly limited. The alkyl group in the alkylalkoxysilane is preferably an alkyl group having 6 to 18 carbon atoms (for example, a hexyl group, an octyl group, a decyl group, or an octadecyl group) from the viewpoint of dispersion stability. The alkoxy group in the alkylalkoxysilane is preferably an alkoxy group having 1 to 3 carbon atoms (for example, a methoxy group, an ethoxy group, or a propoxy group) from the viewpoint of dispersion stability, for example.

[0065] Specific examples of alkylalkoxysilanes used in the surface treatment of zinc oxide include trimethoxyhexylsilane, trimethoxyoctylsilane, trimethoxydecylsilane, trimethoxyoctadecylsilane, triethoxyhexylsilane, triethoxyoctylsilane (cosmetic name: triethoxycaprylylsilane), triethoxydecylsilane, and triethoxyoctadecylsilane. The alkylalkoxysilane used for the surface treatment of zinc oxide is preferably triethoxyoctylsilane.

[0066] The surface treatment of zinc oxide with alkylalkoxysilane can be carried out, for example, by mixing and stirring zinc oxide in alkylalkoxysilane for a certain period of time.

[0067] The zinc oxide (A) may be zinc oxide (a1), zinc oxide (a2), or both zinc oxide (a1) and zinc oxide (a2). However, zinc oxide (a2), i.e., zinc oxide surface-treated with an alkylalkoxysilane, is preferred, and zinc oxide surface-treated with triethoxycaprylylsilane is more preferred.

[0068] The cosmetic preparation according to the present disclosure may contain only one type of zinc oxide, or may contain two or more types. The cosmetic preparation according to the present disclosure may, for example, contain only one or more zinc oxides (a1) out of zinc oxides (a1) and zinc oxides (a2), or may contain only one or more zinc oxides (a2), or may contain one or more zinc oxides (a1) and one or more zinc oxides (a2).

[0069] The content of zinc oxide in the cosmetic composition according to the present disclosure is not particularly limited. The content of zinc oxide is set at the following ratio relative to the total mass of the cosmetic from the viewpoint of UV protection and usability: The content is preferably 3% by mass to 25% by mass, and more preferably 5% by mass to 20% by mass. The zinc oxide may be contained in one type alone or in two or more types. When the cosmetic contains two or more types of zinc oxide, the above content is the total content of two or more types of other particles.

[0070] <Other particles> The cosmetic according to the present disclosure may contain particles other than the above-described avobenzone complex titanium oxide, water-dispersible ultraviolet absorber particles, and zinc oxide (hereinafter also referred to as "other particles"), from the viewpoint of effectively suppressing stickiness on the application surface of the cosmetic.

[0071] The other particles are preferably resin particles with a particle size of 1 μm to 50 μm, more preferably 3 μm to 50 μm, and even more preferably 5 μm to 45 μm. When the particle size of the resin particles is 1 μm or more, the stickiness suppression effect is improved and a good tactile feel tends to be obtained. Furthermore, when the particle size of the other particles is 50 μm or less, particle detachment from the cosmetic coating film and significant protrusion are suppressed, and the tactile feel tends to be further improved.

[0072] In the present disclosure, the particle size of other particles refers to the average primary particle size obtained by arithmetically averaging the equivalent circle diameters of 100 particles evaluated using a scanning electron microscope (SEM).

[0073] The shape of the resin particles may be spherical, plate-like, cubic, etc. even in a dry state, and particles that maintain such a clear three-dimensional structure can be suitably used as resin particles.

[0074] Other examples of particles include particles containing resins or polymers such as nylon, polyethylene, polypropylene, melamine, polyphenylene sulfide, polyethersulfone, polyamideimide, polylactic acid, ethyl cellulose, dimethicone (siloxane), dimethiconol, vinyl dimethicone, silsesquioxane, polyethylene oxide, or crosspolymers thereof, acrylate crosspolymers, collagen, etc., and from the viewpoint of suppressing stickiness, particles containing acrylate crosspolymers are preferred.

[0075] In this disclosure, acrylate-based crosspolymer refers to a crosspolymer that includes structural units derived from acrylic acid esters and / or methacrylic acid esters.

[0076] Acrylate crosspolymers include methyl methacrylate crosspolymer, (methyl methacrylate / glycol dimethacrylate) crosspolymer, (butyl acrylate / glycol dimethacrylate) crosspolymer, (acrylic acid / VP) crosspolymer, (acrylic acid / phosphorylcholine glycol acrylate) crosspolymer, (sodium acrylate / acryloyldimethyltaurine / dimethylacrylamide) crosspolymer, (butyl acrylate / isopropylacrylamide / PEG-18 dimethacrylate) crosspolymer, (acrylic acid / VP ... Acrylates / C10-30 alkyl acrylate crosspolymer, Acrylates / C10-30 alkyl acrylate crosspolymer potassium, Acrylates / C10-30 alkyl acrylate crosspolymer sodium, Acrylates / ethylhexyl acrylate crosspolymer, Acrylates / ethylhexyl acrylate / glycidyl methacrylate crosspolymer, Acrylates / vinyl isodecanoate crosspolymer, Acrylates / vinyl isodecanoate crosspolymer sodium, Acrylates / PEG-4 dimethacrylate Crosspolymer, (Acrylates / Vinyl Neodecanoate) Crosspolymer, (Acrylates / C12,13 Alkyl Methacrylate / Methoxyethyl Acrylate) Crosspolymer, (Acrylates / Steareth-20 Methacrylate) Crosspolymer, (Acrylates / Ceteareth-20 Methacrylate) Crosspolymer, (Acrylates / Trimethylsiloxypropyl Methacrylate) Crosspolymer, (Acrylates / Beheneth-25 Methacrylate) Sodium Crosspolymer, (Acrylates / Methoxy PEG-90 Methacrylate) Crosspolymer, (Sodium acryloyldimethyltaurate / VP) crosspolymer, (Sodium acryloyldimethyltaurate / PEG-8 diacrylate) crosspolymer, (Ammonium acryloyldimethyltaurate / Carboxyethylammonium acrylate) crosspolymer, (Ammonium acryloyldimethyltaurate / Steareth-25 methacrylate) crosspolymer, (Ammonium acryloyldimethyltaurate / Beheneth-25 methacrylate) crosspolymer, (Hexylene glycol dimethacrylate / Glycol dimethacrylate) crosspolymer,Styrene / Acrylates / Dimethicone Acrylate Crosspolymer, Styrene / Stearyl Methacrylate Crosspolymer, Polyurethane-24 / Methyl Methacrylate Crosspolymer, Diethylaminoethyl Methacrylate / HEMA / Perfluorohexylethyl Methacrylate Crosspolymer, Stearyl Methacrylate / Lauryl Methacrylate Crosspolymer, Methyl Methacrylate / PEG Methacrylate / PPG-4 / 3 Crosspolymer, Lauryl Methacrylate / Glycol Dimethacrylate Crosspolymer, Lauryl Methacrylate / Sodium Methacrylate Crosspolymer, Sodium Acrylate Crosspolymer, Lauryl Acrylate Crosspolymer, Acrylates Crosspolymer, Acrylates Crosspolymer Polyacrylate crosspolymer-2-Na, acrylate crosspolymer-3, acrylate crosspolymer-4, acrylate polyacrylate crosspolymer-9-AMP, acrylate crosspolymer K, glycol dimethacrylate crosspolymer, polyacrylate-1 crosspolymer, polyacrylate-2 crosspolymer, polyacrylate crosspolymer-1-Na, polyacrylate crosspolymer-10, polyacrylate crosspolymer-11, polyacrylate crosspolymer-14, polyacrylate crosspolymer-3, polyacrylate crosspolymer-5, polyacrylate crosspolymer-6, allyl methacrylate crosspolymer, propyl methacrylate trimethicone crosspolymer, etc.

[0077] Those containing the above acrylate crosspolymer and in particulate form can be suitably used as the other particles in the present disclosure. In the above examples of acrylate crosspolymers, "VP" stands for "vinylpyrrolidone," "HEMA" stands for "hydroxyethyl methacrylate," and "AMP" stands for "aminomethylpropanol." The other particles may contain only one type of acrylate crosspolymer, or may contain two or more types.

[0078] Furthermore, examples of inorganic particles that can be used as other particles include silica particles, porous silica particles, mica, kaolin, bentonite, calcium carbonate, and talc particles. Examples of silica particles include particles of silica, silica silylate, silica dimethyl silylate, and silica dimethicone silicate.

[0079] Other commercially available particle products include Matsumoto Microsphere S-100 (Matsumoto Yushi Pharmaceutical Co., Ltd., acrylate crosspolymer particles, 20 μm), Matsumoto Microsphere S-102 (Matsumoto Yushi Pharmaceutical Co., Ltd., acrylate crosspolymer particles, 20 μm), Matsumoto Microsphere M (Matsumoto Yushi Pharmaceutical Co., Ltd., acrylate crosspolymer particles, 15 μm), Matsumoto Microsphere M-305 (Matsumoto Yushi Pharmaceutical Co., Ltd., acrylate crosspolymer particles, 15 μm), Techpolymer ACX-1502C (Sekisui Plastics Co., Ltd., particle size 15 μm), Techpolymer ACX-2502 (Sekisui Plastics Co., Ltd.), and SILICA MICRO BEAD (Nikki Catalysts & Chemicals Co., Ltd., silica particles, particle size: 5 μm).

[0080] When the cosmetic contains other particles, the content of the other particles is preferably 0.1% by mass to 5% by mass, more preferably 0.5% by mass to 3% by mass, from the viewpoint of simultaneously achieving skin compatibility, stickiness suppression, and UV protection effects. The other particles may be contained in one type alone or in two or more types. When the cosmetic contains two or more types of other particles, the above content is the total content of the two or more types of other particles.

[0081] <Oil> The cosmetic preparation according to the present disclosure preferably contains an oil. When the cosmetic preparation is constituted as an emulsion, the oil is a component that serves as a solvent or dispersion medium in the composition that forms the oil phase. There are no particular limitations on the oil, as long as it is liquid at room temperature (25°C). Examples of oils include silicone oil, ester oil, and hydrocarbon oil, and it is preferable to contain silicone oil. The cosmetic preparation according to the present disclosure may contain one type of oil agent alone, or may contain two or more types of oil agents.

[0082] Examples of silicone oils include linear or branched polysiloxanes such as dimethicone (dimethylpolysiloxane), methylphenylpolysiloxane, methylhydrogenpolysiloxane, and diphenylsiloxyphenyltrimethicone; cyclic polysiloxanes such as octamethylcyclotetrasiloxane, cyclopentasiloxane (decamethylcyclopentasiloxane), dodecamethylcyclohexasiloxane, and tetramethyltetrahydrogencyclotetrasiloxane; and caprylyl methicone. Commercially available silicone oils include KF-96L-0.65cs, KF-96L-1cs, KF-96L-1.5cs, KF-96L-2cs, KF-96L-5cs, KF-96A-5cs, KF-96A-6cs, KF-96-10cs, KF-96-20cs, KF-995, and KF-56A (all manufactured by Shin-Etsu Chemical Co., Ltd.), SH200 C Fluid 1CS, SH200 Fluid 1.5CS, SH200 C 2CS, SH200 C Fluid 5CS, SH200 C Fluid 6CS, SH200 C Fluid 10CS, SH200 C Fluid 20CS, 2-1184 Fluid, SH245 Fluid, DC246 Fluid, and DC345. Fluid, SS-3408 (all manufactured by Toray Dow Corning Co., Ltd.), TSF404, TSF405, TSF4045 (all manufactured by Momentive Performance Materials Co., Ltd.), etc.

[0083] Examples of ester oils include pentaerythrityl tetraethylhexanoate, cetyl ethylhexanoate, jojoba oil, di(phytosteryl / octyldodecyl) lauroyl glutamate, triisostearin, glyceryl diisostearate, triethylhexanoin, phytosteryl / behenyl dimer dilinoleate, phytosteryl / isostearyl / cetyl / stearyl / behenyl dimer dilinoleate, isopropyl palmitate, phytosteryl macadamiate, pentaerythrityl tetra(behenate / benzoate / ethylhexanoate), ethylhexyl palmitate, myristyl myristate, tripropylene glycol dipivalate, and isotridecyl isononanoate.

[0084] The hydrocarbon oil may be either linear or branched. Examples of the hydrocarbon oil include isoalkanes (isoparaffins) having 8 to 16 carbon atoms, such as isodecane, isododecane, and isohexadecane.

[0085] The content of the oil in the cosmetic is, for example, preferably 5% by mass to 80% by mass, more preferably 10% by mass to 80% by mass, even more preferably 10% by mass to 70% by mass, particularly preferably 15% by mass to 70% by mass, and most preferably 20% by mass to 60% by mass, relative to the total mass of the cosmetic.

[0086] When the cosmetic according to the present disclosure is a water-in-oil cosmetic, it preferably contains 40% by mass or more of silicone oil relative to the total mass of the oil phase excluding avobenzone complex titanium oxide. If the silicone oil content in the oil phase excluding avobenzone complex titanium oxide of the cosmetic agent is 40% by mass or more, the water resistance and feel (refreshing feeling) of the cosmetic tend to be improved. The oil content includes the oil contained together with the silicone gel when a commercially available silicone gel, described below, is used in producing the cosmetic composition according to the present disclosure.

[0087] From the viewpoints of water resistance and usability (specifically, a refreshing feel) of the cosmetic according to the present disclosure, it is preferable that the cosmetic contains dimethicone (dimethylpolysiloxane), cyclopentasiloxane (decamethylcyclopentasiloxane), and diphenylsiloxyloxyphenyl trimethicone. In this case, the content ratio (A:B:C) of dimethicone (A), cyclopentasiloxane (B), and diphenylsiloxyloxyphenyl trimethicone (C) is preferably 1-20:50-95:1-20, and more preferably 5-15:60-90:1-10, by mass.

[0088] The total content of dimethicone, cyclopentasiloxane, and diphenylsiloxyphenyl trimethicone in the cosmetic is, for example, preferably 5% by mass to 80% by mass, more preferably 10% by mass to 70% by mass, and even more preferably 20% by mass to 60% by mass, relative to the total mass of the cosmetic.

[0089] <Polyether-modified silicone> The cosmetic according to the present disclosure may contain a polyether-modified silicone. When the topical skin preparation contains a polyether-modified silicone, emulsion stability tends to be improved when the cosmetic is formulated as an emulsion. The cosmetic may contain one type of polyether-modified silicone alone, or two or more types.

[0090] Polyether-modified silicone is a polymer having a silicone chain as a main chain and a polyether chain introduced by modification. The silicone chain may be a linear silicone chain or a branched silicone chain. Examples of the polyether chain include a polyethylene glycol (PEG) chain and a polypropylene glycol (PPG) chain. The polyether-modified silicone may further have an alkyl chain having 8 to 22 carbon atoms introduced by modification.

[0091] From the viewpoint of emulsion stability of the topical skin preparation, the HLB (Hydrophile-Lipophile Balance) value of the polyether-modified silicone is preferably 1 to 10, more preferably 2 to 8. In this specification, the HLB value of the polyether-modified silicone is a value calculated from the molecular weight and the number of ethylene oxide groups. When using a commercially available product, the HLB value listed in the catalog or the like can be applied as is.

[0092] Examples of polyether-modified silicones include PEG-11 methyl ether dimethicone, PEG / PPG-20 / 22 butyl ether dimethicone, PEG / PPG-19 / 19 dimethicone, PEG-9 dimethicone, PEG-9 methyl ether dimethicone, PEG-10 dimethicone, PEG-21 methyl ether dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, and lauryl PEG-9 polydimethylsiloxyethyl dimethicone. Polyether-modified silicones are also available as commercially available products, such as KF-6011, KF-6011P, KF-6012, KF-6013, KF-6015, KF-6016, KF-6017, KF-6017P, KF-6043, KF-6028, KF-6028P, and KF-6038 (all manufactured by Shin-Etsu Chemical Co., Ltd.).

[0093] From the viewpoint of emulsion stability of the topical skin preparation, the polyether-modified silicone is preferably a polyether-modified silicone having a branched silicone chain, and more preferably at least one selected from PEG-9 polydimethylsiloxyethyl dimethicone and lauryl PEG-9 polydimethylsiloxyethyl dimethicone.

[0094] When a cosmetic contains polyether-modified silicone, the content of polyether-modified silicone is, for example, preferably 0.01% to 10% by mass, more preferably 0.1% to 9% by mass, and even more preferably 1% to 8% by mass, relative to the total mass of the cosmetic. If the content of polyether-modified silicone is 0.01% by mass or more, emulsion stability tends to improve when the cosmetic is formulated as an emulsion, and if the content of polyether-modified silicone is 10% by mass or less, stickiness after application of the cosmetic tends to decrease.

[0095] <Silicone gel> The cosmetic preparation according to the present disclosure may contain a silicone gel from the viewpoint of emulsion stability and the like. In the present disclosure, silicone gel refers to a cross-linked silicone material in which silicone chains forming the main chain skeleton are cross-linked with each other via polyether chains, polyglycerin chains, silicone chains, or the like. Depending on the chain structure used for crosslinking, there are various types, such as polyether-modified silicone gel, polyglycerin-modified silicone gel, polyether-alkyl co-modified silicone gel, and polyglycerin-alkyl co-modified silicone gel. These can be used without limitation in the cosmetic compositions according to the present disclosure.

[0096] Specific examples of silicone gels include (dimethicone / (PEG-10 / 15) crosspolymer, (PEG-15 / lauryl dimethicone) crosspolymer, (PEG-10 / lauryl dimethicone) crosspolymer, (PEG-15 / lauryl polydimethylsiloxyethyl dimethicone) crosspolymer, (dimethicone / polyglycerin-3) crosspolymer, (lauryl dimethicone / polyglycerin-3) crosspolymer, (polyglyceryl-3 / lauryl polydimethylsiloxyethyl dimethicone) crosspolymer, (dimethicone / vinyl dimethicone) crosspolymer, (dimethicone / phenyl vinyl dimethicone) crosspolymer, (vinyl dimethicone / lauryl dimethicone) crosspolymer, and (lauryl polydimethylsiloxyethyl dimethicone / bis vinyl dimethicone) crosspolymer.

[0097] Commercially available silicone gels include KSG-210, KSG-240, KSG-310, KSG-320, KSG-330, KSG-340, KSG-320Z, KSG-350Z, KSG-360Z, KSG-380Z, KSG-710, KSG-810, KSG-820, KSG-830, KSG-840, and KSG-820. Z, KSG-850Z, KSG-15, KSG-1510, KSG-16, KSG-1610, KSG-18A, KSG-19, KSG-016F, KSG-41A, KSG-42A, KSG-43A, KSG-44A, KSG-042Z, KSG-045Z, KSG-048Z (all manufactured by Shin-Etsu Chemical Co., Ltd.), and the like.

[0098] Among silicone gels, from the viewpoints of availability, swelling ability in oily agents such as silicone oil, and emulsion stability, at least one selected from the group consisting of (dimethicone / (PEG-10 / 15) crosspolymer and (dimethicone / vinyl dimethicone) crosspolymer is preferred, and it is more preferred to use (dimethicone / (PEG-10 / 15) crosspolymer and (dimethicone / vinyl dimethicone) crosspolymer in combination.

[0099] The content of silicone gel in the cosmetic is, for example, preferably 0.1% to 8% by mass, more preferably 0.1% to 6% by mass, and even more preferably 0.1% to 4% by mass, relative to the total mass of the cosmetic.

[0100] The cosmetic may contain one type of silicone gel alone or two or more types. When the cosmetic contains two or more types of silicone gel, the above content is the total content of the two or more types of silicone gel.

[0101] <Surfactant> The cosmetic according to the present disclosure may contain a surfactant. When the cosmetic contains a surfactant, the viscosity stability, emulsion stability, etc. of the cosmetic tend to be improved. The cosmetic may contain one type of surfactant alone, or two or more types of surfactants.

[0102] The surfactant may be either a nonionic surfactant or an ionic surfactant. Examples of ionic surfactants include alkyl sulfonates, alkyl sulfates, monoalkyl phosphates, and lecithin. Examples of nonionic surfactants include sorbitan fatty acid esters, glycerin fatty acid esters, organic acid monoglycerides, polyglycerin fatty acid esters, propylene glycol fatty acid esters, polyglycerin condensed ricinoleic acid esters, sucrose fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene alkyl ethers, polyoxypropylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene propylene glycol fatty acid esters, polyoxyethylene castor oil, and polyoxyethylene hydrogenated castor oil.

[0103] When a cosmetic contains a surfactant, the surfactant content is, for example, preferably 0.01% by mass to 30% by mass, more preferably 0.05% by mass to 20% by mass, and even more preferably 0.1% by mass to 10% by mass, relative to the total mass of the cosmetic. If the surfactant content is 0.01% by mass or more, the viscosity stability of the cosmetic tends to improve, and if the surfactant content is 30% by mass or less, the feel during use tends to improve.

[0104] <Water> The cosmetic according to the present disclosure preferably contains water. When the cosmetic is formulated as an emulsion, water is a component that serves as a solvent or dispersion medium in the composition that constitutes the aqueous phase. There are no particular limitations on the water as long as it is applicable to cosmetics.

[0105] <Polyhydric alcohol> The cosmetic preparation according to the present disclosure may contain a polyhydric alcohol. When the topical skin preparation contains a polyhydric alcohol, the feeling of use (moisturizing properties) of the topical skin preparation tends to be improved. The cosmetic preparation may contain one type of polyhydric alcohol alone, or two or more types of polyhydric alcohols.

[0106] Examples of polyhydric alcohols include glycerin, polyglycerin, ethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,2-pentanediol, 1,2-hexanediol, polyethylene glycol, glucose, galactose, sucrose, sorbitol, maltitol, erythritol, xylitol, and trehalose.

[0107] From the viewpoint of improving affinity with the skin, the cosmetic composition according to the present disclosure preferably contains 1,3-butylene glycol.

[0108] <Other ingredients> The cosmetic according to the present disclosure may contain other ingredients as long as the effects of the cosmetic according to the present disclosure are not impaired. Other ingredients include fatty acids, lipophilic thickeners, water-soluble organic solvents (ethanol, etc.), preservatives (phenoxyethanol, methylparaben, etc.), pH adjusters, emollients, moisturizers, antioxidants, colorants, fragrances, and other functional ingredients.

[0109] <Uses of cosmetics> The formulation of the cosmetic to which the cosmetic according to the present disclosure is applied may be either an oil-in-water type or a water-in-oil type, but a water-in-oil type cosmetic is more preferable because it allows for stable incorporation of an ultraviolet blocking component. Examples of the cosmetic include skin care cosmetics, sunscreen cosmetics, and makeup cosmetics such as makeup bases, and the present invention can be suitably applied to sunscreen cosmetics.

[0110] [Cosmetic manufacturing method] The method for producing the cosmetic according to the present disclosure is not particularly limited, and the cosmetic can be produced according to a known method for producing a cosmetic. An example of a manufacturing method for producing a cosmetic according to the present disclosure as a water-in-oil cosmetic is shown below.

[0111] For example, when avobenzone complex titanium oxide is blended into the oil phase, an oil phase composition containing avobenzone complex titanium oxide and other oil phase components (e.g., zinc oxide, other particles, oils, and other optional components) is prepared, and the resulting oil phase composition is mixed with an aqueous phase composition to produce a water-in-oil cosmetic. Furthermore, when avobenzone complex titanium oxide is blended into the aqueous phase, an aqueous phase composition containing avobenzone complex titanium oxide and other aqueous phase components is prepared, and the obtained aqueous phase composition is mixed with an oil phase composition to produce an oil-in-water cosmetic. The emulsification method used to obtain a water-in-oil cosmetic as a water-in-oil emulsion by mixing the oil phase composition and the aqueous phase composition is not particularly limited, and can be carried out according to a conventional method. [Example]

[0112] The cosmetic and oily composition according to the present disclosure will be explained in more detail below using examples, but the cosmetic according to the present disclosure is not limited to the following examples. The cosmetics of each example can be suitably used as sunscreen cosmetics.

[0113] [Manufacturing Example 1] Cyclopentasiloxane (trade name: KF-995, Shin-Etsu Chemical Co., Ltd.), avobenzone complex titanium oxide (trade name: HXMT-100ZA, composite powder, Teika Corporation), and PEG-9 polydimethylsiloxyethyl dimethicone (trade name: KF-6028, Shin-Etsu Chemical Co., Ltd.) were thoroughly mixed and stirred at room temperature (25°C, the same applies below) using a disper. Thereafter, ethylhexyl methoxycinnamate (trade name: Uvinul MC80 N, BASF Japan Ltd.) was further added, and the mixture was stirred and mixed to homogenize, thereby obtaining an oily composition of Production Example 1.

[0114] The composition (parts by mass) of the oily composition prepared in Production Example 1 is shown in Table 1.

[0115] [Production Examples 2 to 4, Comparative Production Examples 1 to 3] In preparing the oily composition of Production Example 1, the amount of ethylhexyl methoxycinnamate added was changed to the amount shown in Table 1, and the oily compositions of Production Examples 2 to 4 and Comparative Production Examples 1 to 3 were obtained in the same manner as in Production Example 1.

[0116] [Evaluation of oily compositions] Each oily composition obtained was filled into a glass vial in an amount of 30 mL, sealed, and stored at 25°C for 2 days. between After standing, each oily composition was visually inspected for the presence or absence of precipitation and evaluated according to the following evaluation criteria. The results are shown in Table 1.

[0117] =Evaluation criteria= A: No precipitation was observed. B: Precipitation was observed.

[0118] [Table 1]

[0119] As shown in Table 1, each oily composition of the production examples did not produce precipitation upon addition of ethylhexyl methoxycinnamate, and it is clear that the composition has good stability over time. On the other hand, Comparative Production Example 1, in which the content ratio of ethylhexyl methoxycinnamate to avobenzone complex titanium oxide (composite powder) was 0.9 or more, precipitates formed after leaving the mixture at 25°C for 2 days, resulting in poor stability over time. This is thought to be due to the avobenzone adsorbed on the surface of the composite powder dissolving in the ethylhexyl methoxycinnamate, which reduced the dispersion stability of the composite powder.

[0120] [Example 1] Water-in-oil cosmetics were prepared as follows, according to the formulations shown in Table 1, so that the total amount of each component was 100% by mass.

[0121] (Preparation of Oil Phase Composition) Cyclopentasiloxane (trade name: KF-995, Shin-Etsu Chemical Co., Ltd.), avobenzone complex titanium oxide (trade name: HXMT-100ZA, composite powder, Teika Corporation), and PEG-9 polydimethylsiloxyethyl dimethicone (trade name: KF-6028, Shin-Etsu Chemical Co., Ltd.) were thoroughly mixed and stirred at room temperature (25°C, the same applies below) using a disper. Subsequently, dimethicone / vinyl dimethicone crosspolymer (trade name: KSG-16, Shin-Etsu Chemical Co., Ltd.), dimethicone / PEG-10 / 15 crosspolymer (trade name: KSG-210, Shin-Etsu Chemical Co., Ltd.), ethylhexyl methoxycinnamate (Uvinul MC80 N, BASF Japan Ltd.), butyl acrylate / glycol dimethacrylate crosspolymer and butyl methacrylate / glycol dimethacrylate crosspolymer (trade name: Matsumoto Microsphere S-100, particle size: 15 μm, Matsumoto Yushi Pharmaceutical Co., Ltd.), sorbitan sesquioleate (trade name: NIKKOL SO-15V, Nikko Chemicals Co., Ltd.), dimethicone (trade name: KF-96A-5cs, Shin-Etsu Chemical Co., Ltd.), diphenylsiloxyphenyl trimethicone (trade name: KF-56A, Shin-Etsu Chemical Co., Ltd.), and tri(trimethylsiloxy)silylpropylcarbamate pullulan (trade name: TSP-30-D5, Shin-Etsu Chemical Co., Ltd.) were further added, and the mixture was stirred and mixed to homogenize, to obtain an oil phase composition.

[0122] (Preparation of aqueous phase composition) Magnesium sulfate, sodium citrate, dipotassium glycyrrhizinate, carambola leaf extract, crape myrtle leaf extract, centaurea cyanus flower extract, and fragrance were added to purified water, phenoxyethanol, BG (1,3-butylene glycol), and ethanol, and the mixture was stirred and mixed at room temperature to obtain a homogenous aqueous phase composition.

[0123] (Preparation of water-in-oil cosmetic) Next, the oil phase composition and the aqueous phase composition were mixed according to a conventional method and stirred for 15 minutes at 3000 rpm using a homogenizer (trade name: HM-310, AS ONE Corporation), to obtain the water-in-oil cosmetic of Example 1.

[0124] [evaluation] 1. UV protection effect The SPF and UVA-PF values ​​of each water-in-oil cosmetic composition were calculated using a simulator provided by BASF (www.basf.com / sunscreensimulator; Herzog, B.; Osterwalder, U. In Silico Determination of Topical Sun Protection. Cosm Sci Tech. 2011;62:1-8).

[0125] Based on the calculated SPF and UVA-PF values, the UV blocking effect was evaluated according to the following evaluation criteria. Evaluation ranks of "AAA", "AA", "A" and "B" are practically acceptable, with "AAA", "AA" and "A" being preferred, "AAA" and "AA" being more preferred, and "AAA" being particularly preferred.

[0126] =Evaluation criteria= AAA: SPF 50 or higher, UVA-PF 16 or higher. AA: SPF between 30 and 50, and UVA-PF between 8 and 16. A: SPF is between 10 and 30, and UVA-PF is between 4 and 8. B: SPF is between 5 and 10, and UVA-PF is between 2 and 4. C: SPF less than 5 and UVA-PF less than 2.

[0127] 2. Stability over time 50 mL of each water-in-oil cosmetic was filled into a glass vial, sealed, and stored at 25°C for 60 days. After aging, the water-in-oil cosmetics were visually inspected for syneresis, and the stability over time was evaluated according to the following evaluation criteria. The results are shown in Table 2. =Evaluation criteria= A: No syneresis was observed after time had passed. B: Syneresis was observed after time had passed.

[0128] [Examples 2 to 4, Comparative Examples 1 and 2] The water-in-oil cosmetics of Examples 2 to 4 and Comparative Examples 1 and 2 were obtained in the same manner as in Example 1, except that the blending amounts of each component used in preparing the water-in-oil cosmetic in Example 1 were changed to the components and blending amounts shown in Table 2 below. Each of the obtained water-in-oil cosmetic compositions was evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0129] [Table 2]

[0130] As shown in Table 2, it can be seen that the water-in-oil cosmetic preparations of Examples 1 to 4 are excellent in both UV blocking effect and stability over time. On the other hand, the water-in-oil cosmetic of Comparative Example 1 had an avobenzone complex titanium oxide content of less than 3.0% by mass relative to the total mass of the cosmetic, and thus did not achieve sufficient UV blocking effect.The water-in-oil cosmetic of Comparative Example 2 had an ethylhexyl methoxycinnamate to avobenzone complex titanium oxide content ratio of 0.9 or more, and as a result, had poor stability over time.

[0131] [Examples 5 to 7] Water-in-oil cosmetics of Examples 5 to 7 were obtained in the same manner as in Example 1, except that the amounts of avobenzone complex titanium oxide and cyclopentasiloxane in Example 1 were changed to the amounts shown in Table 3.

[0132] [evaluation] Each of the obtained water-in-oil cosmetic compositions was evaluated for "1. UV protection effect" and "2. Stability over time" in the same manner as in Example 1. Furthermore, each of the obtained water-in-oil cosmetic compositions was evaluated for "3. Spreadability" shown below.

[0133] 3. Good spreadability Four expert panelists spread 100 μL of each water-in-oil cosmetic on the inside of their forearms with their fingers, and evaluated whether the cosmetic followed the movement of their fingers and spread easily according to the following evaluation criteria. The evaluation ranks are "A", "B" and "C" are preferred, "A" and "B" are more preferred, and "A" is even more preferred. The evaluation rank with the most people was used as the evaluation result for the stretchability.

[0134] =Evaluation criteria- A: It has very good stretch. B: Good stretch. C: Moderately spreadable to an acceptable extent as a cosmetic.

[0135] The above results are shown in Table 3.

[0136] [Table 3]

[0137] As shown in Table 3, all of the water-in-oil cosmetics of the examples were excellent in UV blocking effect and stability over time, and it was found that when the content of avobenzone complex titanium was within the range of 3.0% by mass to 21.0% by mass relative to the total mass of the cosmetic, they were superior in "spreadability."

[0138] [Examples 8 to 11] The water-in-oil cosmetics of Examples 8 to 11 were obtained in the same manner as in Example 3, except that diethylaminohydroxybenzoylhexylbenzoate (solid oil-soluble UV absorber, trade name Uvinul A Plus Granular, BASF Japan Ltd.), methylenebisbenzotriazolyltetramethylbutylphenol (water-dispersible UV absorber particles, trade name Tinosorb M, BASF Japan Ltd.), and triethoxycaprylylsilane-treated zinc oxide (zinc oxide, trade name MZX-508OTS, Teika Corporation) were further added to the components used to prepare the water-in-oil cosmetic in Example 3, in the amounts shown in Table 4 below.

[0139] Note that blank spaces in the composition column in Table 4 indicate that the corresponding component was not blended.

[0140] [evaluation] Using each of the obtained water-in-oil cosmetic compositions, "1. UV blocking effect" and "2. stability over time" were evaluated in the same manner as in Example 3. The results are shown in Table 4.

[0141] [Table 4]

[0142] As shown in Table 4, it was found that the water-in-oil cosmetics of Examples 8 to 11, which were prepared by adding a solid oil-based UV absorber (diethylaminohydroxybenzoylhexylbenzoate), a water-dispersible particulate UV absorber (methylenebisbenzotriazolyltetramethylbutylphenol), and / or zinc oxide to the water-in-oil cosmetic of Example 3, had improved UV blocking effect compared to Example 3 and had the same stability over time as Example 3.

Claims

1. Contains a composite powder of titanium oxide and 4-tert-butyl-4'-methoxydibenzoylmethane, and ethylhexyl methoxycinnamate, the content of the composite powder is 3.0% by mass to 30.0% by mass relative to the total mass of the cosmetic; The content ratio of the ethylhexyl methoxycinnamate to the composite powder is 0.10 to 0.80 by mass. Cosmetics.

2. 2. The cosmetic according to claim 1, wherein the content of the composite powder is 3.0% by mass to 21.0% by mass relative to the total mass of the cosmetic.

3. The cosmetic according to claim 1 or 2, further comprising a solid oil-soluble ultraviolet absorber.

4. The cosmetic preparation according to claim 1 or 2, further comprising water-dispersible ultraviolet absorber particles.

5. The cosmetic preparation according to claim 1 or 2, further comprising zinc oxide.

6. The cosmetic according to claim 1 or 2, which is a water-in-oil cosmetic.

7. The cosmetic according to claim 1 or 2, which is a sunscreen cosmetic.

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