Emulsified composition for external use and method for producing same

Abstract

Provided is a novel composition having excellent ultraviolet absorption ability. Specifically disclosed is an emulsified composition for external use, which contains (C) diethylaminohydroxybenzoylhexyl benzoate and (A) a porous silica containing an ultraviolet light absorber, and which is characterized in that the average particle diameter of the porous silica is 1.4-40 [mu] m and the ultraviolet light absorber contained in the component (A) is a solid at 25 DEG C. Or an emulsified external composition which contains (A2) a porous silica containing an ultraviolet absorber and (B) a nonionic surfactant, the porous silica having an average particle diameter of 1.4-40 [mu] m, and the porous silica containing an ultraviolet absorber that is solid at 25 DEG C.

Description

Technical Field

[0001] The present invention relates to an emulsified external composition. More specifically, it relates to an emulsified external composition containing porous silica encapsulating an ultraviolet absorber. Background Art

[0002] Ultraviolet rays include ultraviolet A wave (UV-A), ultraviolet B wave (UV-B), and others. Among them, although UV-A is not likely to cause sunburn, recent studies have shown that it is closely related to the formation of spots and wrinkles. That is, the wavelength of UV-A is relatively long and can reach deep into the skin, for example, causing effects such as modifying collagen.

[0003] The wavelength of UV-B is relatively short. Compared with UV-A, it is blocked by the ozone layer and clouds, and the amount reaching the ground is relatively small, accounting for about 10% of the total amount of ultraviolet rays. However, the energy of UV-B is strong, which can damage the cells on the surface of the skin or cause inflammation, and thus can sometimes cause skin cancer and spots.

[0004] As the impact of ultraviolet rays on the skin has become clear, the demand for external compositions with high ultraviolet blocking effects has been increasing, and various external compositions have been proposed (Patent Document 1).

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2015-17080 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] An object of the present invention is to provide an emulsified external composition having excellent ultraviolet absorption ability.

[0010] Solutions to the Problems

[0011] The inventors of the present invention conducted in-depth research and found that an emulsified external composition containing porous silica encapsulating an ultraviolet absorber and diethylamino hydroxybenzoyl hexyl benzoate, or an emulsified external composition containing porous silica encapsulating an ultraviolet absorber and a nonionic surfactant, can provide excellent ultraviolet absorption ability and good usability, thus completing the present invention.

[0012] That is, in the first aspect of the present invention, the following emulsified external composition is provided. [1]

[0014] An emulsified external composition, which is an emulsified external composition containing (C1) hexyl diethylaminohydroxybenzoyl benzoate and (A1) porous silica encapsulating an ultraviolet absorber, wherein the average particle size of the porous silica is 1.4 to 40 μm, and the porous silica is porous silica encapsulating an ultraviolet absorber that is solid at 25°C. [2]

[0016] The emulsified external composition according to [1], wherein the ultraviolet absorber encapsulated in the component (A1) is at least one selected from the group consisting of hexyl diethylaminohydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, methylene bis-benzotriazolyl tetramethylbutylphenol, terephthalylidene dicamphor sulfonic acid, terephthalylidene dicamphor sulfonic acid, cresol triazone, ethylhexyl triazone, and phenylbenzimidazole sulfonic acid. [3]

[0018] The emulsified external composition according to [1] or [2], wherein the encapsulation rate of the ultraviolet absorber with respect to the porous silica is 30 to 50%.

[0019] The present invention further provides the following method. [4]

[0021] A method for enhancing the ultraviolet absorption ability of an emulsified external composition, which includes: making hexyl diethylaminohydroxybenzoyl benzoate and (A1) porous silica encapsulating an ultraviolet absorber coexist in the emulsified external composition. [5]

[0023] A method for manufacturing an emulsified external composition, which is a method for manufacturing an emulsified external composition containing (C1) hexyl diethylaminohydroxybenzoyl benzoate and (A1) porous silica encapsulating an ultraviolet absorber, and includes the following steps: mixing (C1) hexyl diethylaminohydroxybenzoyl benzoate and (A1) porous silica encapsulating an ultraviolet absorber, wherein the average particle size of the porous silica is 1.4 to 40 μm, and the porous silica is porous silica encapsulating an ultraviolet absorber that is solid at 25°C.

[0024] In the second aspect of the present invention, an emulsified external composition in the following emulsified form is provided. [6]

[0026] An emulsified external composition, which is an emulsified external composition containing (A2) porous silica encapsulating an ultraviolet absorber and (B) a nonionic surfactant, wherein the average particle size of the porous silica is 1.4 to 40 μm, the porous silica is porous silica encapsulating an ultraviolet absorber that is solid at 25°C, and the encapsulation rate of the ultraviolet absorber with respect to the porous silica is 30 to 50%. [7]

[0028] The emulsified external composition according to [6], wherein the nonionic surfactant is a surfactant having an HLB (hydrophile lipophile balance) value of 5.0 to 20. [8]

[0030] The emulsified external composition according to [6] or [7], further comprising (C3) an ultraviolet absorber. [9]

[0032] The emulsified external composition according to claim [8], wherein the (C3) ultraviolet absorber is diethylamino hydroxybenzoyl hexyl benzoate.

[10]

[0034] The emulsified external composition according to any one of [6] to [9], wherein the ultraviolet absorber encapsulated in the (A2) component is bis-ethylhexyloxyphenol methoxyphenyl triazine.

[11]

[0036] A method for producing an emulsified external composition, which is a method for producing an emulsified external composition containing (A2) porous silica encapsulating an ultraviolet absorber and (B) a nonionic surfactant, comprising the following steps: mixing (A2) porous silica encapsulating an ultraviolet absorber and (B) a nonionic surfactant, wherein the average particle size of the porous silica is 1.4 to 40 μm, the porous silica is porous silica encapsulating an ultraviolet absorber that is solid at 25°C, and the encapsulation rate of the ultraviolet absorber with respect to the porous silica is 30 to 50%.

[0037] Advantages of the Invention

[0038] The emulsified external composition according to the present invention can achieve excellent ultraviolet absorption ability and good usability. Detailed Description of the Invention

[0039] In this specification, in the ultraviolet region, the UVA region represents a region with a wavelength of 320 nm or more and less than about 400 nm, and the UVB region represents a region with a wavelength of 280 nm or more and less than about 320 nm.

[0040] In this specification, "excellent ultraviolet absorption ability" means having at least any one of the following abilities: excellent absorption ability for ultraviolet rays of a specific wavelength or the ability to absorb ultraviolet rays over a wide range of wavelengths.

[0041] More specifically, the ability to absorb ultraviolet rays over a wide range of wavelengths can be represented by the spectral integral value of the emulsified external composition of the present invention in the wavelength range of 280 nm to 400 nm (hereinafter, sometimes referred to as "spectral integral value").

[0042] In this specification, the spectral integral value of 280 nm to 400 nm represents a value calculated by integrating the absorbance in the region of 280 to 400 nm in the absorption spectrum of the emulsified external composition.

[0043] In this specification, "good usability" is not particularly limited. For example, it means including less stickiness, having a skin-friendly feeling or a moist feeling and / or having a watery feeling, and preferably having all of these.

[0044] In this specification, the "salt" may be any pharmaceutically, pharmacologically or physiologically acceptable salt without particular limitation. Specifically, there are salts with inorganic bases such as alkali metal salts and alkaline earth metal salts, and basic salts such as salts with organic bases. Examples include salts with sodium, potassium, calcium, magnesium, ammonium, diethanolamine or ethylenediamine. In addition, it may also be a salt of an amine such as ammonia, methylamine, dimethylamine, trimethylamine, dicyclohexylamine, tris(hydroxymethyl)aminomethane, N,N-bis(hydroxyethyl)piperazine, 2-amino-2-methyl-1-propanol, ethanolamine, N-methylglucosamine, L-glucosamine; salts with basic amino acids such as lysine, δ-hydroxylysine, arginine, etc. Moreover, it may also be a salt with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid; salts with organic acids such as methanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, acetic acid, propionic acid, tartaric acid, fumaric acid, maleic acid, malic acid, oxalic acid, succinic acid, citric acid, benzoic acid, mandelic acid, cinnamic acid, lactic acid, glycolic acid, glucuronic acid, ascorbic acid, nicotinic acid, salicylic acid, gluconic acid, palmitic acid; salts with acidic amino acids such as aspartic acid and glutamic acid. The above "salts" include solvates and hydrates of the salts.

[0045] In this specification, "encapsulating" an ultraviolet absorber means not only including the case where the ultraviolet absorber exists by entering the pores of porous silica, but also including the case where the ultraviolet absorber is supported.

[0046] [First aspect: Emulsified external composition]

[0047] In a first aspect of the present invention, there is provided an emulsified topical composition containing (C1) hexyl diethylaminohydroxybenzoylbenzoate and (A1) porous silica encapsulating an ultraviolet absorber, wherein the porous silica has an average particle size of 1.4 to 40 μm, and the porous silica is porous silica encapsulating an ultraviolet absorber that is solid at 25°C.

[0048] Hexyl diethylaminohydroxybenzoylbenzoate (DHHB) (CAS registration number 5809-23-4) is also known as hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate.

[0049] In one aspect of the present invention, there is provided a new method that can ensure the design freedom of the formulation and form of the emulsified topical composition regardless of the content of DHHB and can exhibit good ultraviolet absorption performance.

[0050] The emulsified topical composition in this aspect is characterized by containing (C1) hexyl diethylaminohydroxybenzoylbenzoate and (A1) porous silica encapsulating an ultraviolet absorber.

[0051] ((C1) Hexyl diethylaminohydroxybenzoylbenzoate)

[0052] Hexyl diethylaminohydroxybenzoylbenzoate (DHHB) has a maximum absorption wavelength at 354 nm and can particularly absorb the UVA region in ultraviolet rays. DHHB is not particularly limited as long as it can be used in topical compositions. For example, as commercially available DHHB, Uvinul A Plus Granular (manufactured by BASF) etc. can be used.

[0053] Here, hexyl diethylaminohydroxybenzoylbenzoate can also be encapsulated in a carrier such as porous silica different from the (A1) component, but it is preferably in a state of not being encapsulated or supported on a carrier.

[0054] From the viewpoint of more significantly exhibiting the ultraviolet absorption effect, the content of (C1) hexyl diethylaminohydroxybenzoylbenzoate is preferably 0.3% by mass or more, more preferably 0.5% by mass or more, and further preferably 0.7% by mass or more, relative to the total amount of the emulsified topical composition. From the viewpoint of the feeling in use, for example, it can be set to 10% by mass or less, 5% by mass or less, or 3% by mass or less.

[0055] The content of (C1) hexyl diethylaminohydroxybenzoylbenzoate relative to the total amount of the emulsified topical composition can preferably be 0.3 to 10% by mass, more preferably 0.3 to 5% by mass, and further preferably 0.7 to 3% by mass.

[0056] ((A1) Porous silica containing an ultraviolet absorber)

[0057] In the (A1) component, the ultraviolet absorber may be any ultraviolet absorber that is solid at 25°C and can be used in an external composition, and there is no particular limitation. One compound may be used alone, or two or more compounds may be used in combination. Such an ultraviolet absorber is preferably at least one selected from the group consisting of triazine derivative ultraviolet absorbers, benzylidene camphor-based ultraviolet absorbers, phenylbenzotriazole-based ultraviolet absorbers, salicylic acid-based ultraviolet absorbers, cinnamic acid-based ultraviolet absorbers, benzoylmethane-based ultraviolet absorbers, benzoate derivative ultraviolet absorbers, benzylidene malonate derivative ultraviolet absorbers, octocrylene-based ultraviolet absorbers, imidazole sulfonic acid derivative ultraviolet absorbers, and benzophenone derivative ultraviolet absorbers, and more preferably at least one selected from the group consisting of triazine derivative ultraviolet absorbers, benzylidene camphor-based ultraviolet absorbers, and phenylbenzotriazole-based ultraviolet absorbers.

[0058] Specific examples of such ultraviolet absorbers are preferably selected from the group consisting of bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT) (alias: 2,4-bis-[(4-(2-ethylhexyloxy)-2-hydroxy)phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine), methylene bis-benzotriazolyl tetramethylbutylphenol (alias: 2,2'-methylene bis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol]), terephthalylidene dicamphor sulfonic acid, terephthalylidene dicamphor sulfonic acid, cresol triazole trisiloxane, ethylhexyl triazone (alias: 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine), phenylbenzimidazole sulfonic acid, 4-tert-butyl-4'-methoxybenzoyl methane (alias: tert-butylmethoxybenzoyl methane, alias: avobenzone), 2-ethylhexyl dimethoxybenzylidene dioxoimidazoline propionate, disodium dihydroxydimethoxybenzophenone disulfonate, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid and its salts, dihydroxydimethoxybenzophenone, dihydroxybenzophenone, tetrahydroxybenzophenone (oxybenzone-2), dihydroxybenzophenone, ferulic acid, octyl salicylate (2-ethylhexyl salicylate), homomenthyl salicylate, terphenyl triazine, methyl 2,5-diisopropylcinnamate, glycerol mono-2-ethylhexanoate bis(p-methoxycinnamate), 2-ethylhexyl p-methoxycinnamate (alias: ethylhexyl methoxycinnamate), cinoxate, a mixture of isopropyl p-methoxycinnamate and diisopropyl cinnamate, polydimethylsiloxane diethylbenzylidene malonate, 2-ethylhexyl 2-cyano-3,3-diphenylacrylate (alias: octocrylene), 2-phenylbenzimidazole-5-sulfonic acid, p-aminobenzoic acid (hereinafter simply referred to as "PABA") or its derivatives (ethyl PABA, ethyl dihydroxypropyl PABA, ethylhexyl dimethyl PABA, PABA glycerol ester, etc.), 4-(2-β-glucopyranosyloxy)propoxy-2-hydroxybenzophenone, 1-(3,4-dimethoxyphenyl)-4,4-dimethyl-1,3-pentanedione, methyl bis(trimethylsilyloxy)silyl isopentyl trimethoxycinnamate, and pentyl p-dimethylaminobenzoate, and more preferably at least one selected from the group consisting of bis-ethylhexyloxyphenol methoxyphenyl triazine, methylene bis-benzotriazolyl tetramethylbutylphenol, terephthalylidene dicamphor sulfonic acid, cresol triazole trisiloxane, ethylhexyl triazone, and phenylbenzimidazole sulfonic acid.

[0059] It may also be a formulation encapsulating diethylamino hydroxybenzoyl benzoic acid hexyl ester (DHHB).

[0060] Among them, from the viewpoint of more significantly exerting the effect of this solution, the ultraviolet absorber in the (A1) component preferably has a maximum absorption wavelength in the region of 300 nm or more, more preferably in the region of 310 nm or more. The ultraviolet absorber further preferably also has a maximum absorption wavelength in the UVB region.

[0061] In the (A1) component, the porous silica encapsulating the ultraviolet absorber only needs to have pores capable of encapsulating the ultraviolet absorber, and there is no particular limitation. One or more kinds of porous silica can be used. From the viewpoint of good usability, the shape of the porous silica is preferably spherical or granular.

[0062] Regarding the size of the porous silica, the average particle diameter of the porous silica can preferably be set to 1.4 μm or more, more preferably 2 μm or more. From the viewpoint of good usability, the average particle diameter of the porous silica can preferably be set to 40 μm or less, more preferably 30 μm or less, further preferably 20 μm or less, and even more preferably 10 μm or less. The average particle diameter of the porous silica can preferably be 1.4 μm to 40 μm, more preferably 2 μm to 30 μm. Here, the average particle diameter represents the average particle diameter in the volume-based particle size distribution measured using a laser diffraction scattering type particle size distribution measuring device.

[0063] The oil absorption amount of the porous silica is not particularly limited, preferably 80 mL / 100 g or more, more preferably 90 mL / 100 g or more, further preferably 100 mL / 100 g or more, preferably 400 mL / 100 g or less, more preferably 350 mL / 100 g, and further preferably 200 mL / 100 g. For example, there is no limitation, but it can preferably be set to 90 mL / 100 g to 350 mL / 100 g, more preferably 100 mL / 100 g to 300 mL / 100 g, and further preferably 100 mL / 100 g to 200 mL / 100 g. The oil absorption amount can be confirmed by the oil absorption amount obtained by using the general test method for measuring the oil absorption amount of pigments and extender pigments in JIS K 5101-13-1.

[0064] Porous silica can be used, for example, as commercially available products such as SUNSPHERE (manufactured by AGC Si-Tech Co., Ltd.), COSMESILICA (manufactured by Fuji Silysia Chemical Ltd.), Mizupearl (manufactured by Mizusawa Chemical Industry Co., Ltd.), SILICAMICRO BEAD (manufactured by JGC Catalysts & Chemicals Ltd.), Pulzea SIT-40, Pulzea SIZ-30 (manufactured by Suzuki Oil & Fat Co., Ltd.), Godd Ball B-25C, Godd Ball D-25C (manufactured by Suzuki Oil & Fat Co., Ltd.), etc.

[0065] The surface of the porous silica can also be treated with inorganic fine particles such as metal oxides such as titanium oxide and zinc oxide. The coating layer can be about 10 to 40% by mass in the porous silica.

[0066] (A1) Porous silica encapsulating a UV absorber can be produced, for example, by adding porous silica to a solution obtained by dissolving a UV absorber in a solvent to impregnate the porous silica with the UV absorber and then removing the solvent. The solvent only needs to dissolve the UV absorber, and there are no restrictions on its type and number of components. Known solvents can be used. In the solution obtained by dissolving the UV absorber in a solvent, a solvent in which the porous silica is more preferably uniformly dispersed is preferred. The solvent is not limited, and examples thereof include toluene, cyclohexane, hexane, xylene, ethyl acetate, butyl acetate, etc., and toluene is preferred. As the solvent used herein, for example, it is preferably free of methanol or substantially free of methanol (for example, 1% by mass or less), but there is no limitation. The porous silica can be impregnated with the UV absorber by stirring and mixing using a known method. For example, as the stirring method, a magnetic stirrer, mixer, ultrasonic wave, homogenizer, high-pressure homogenizer, dispersion mixer, bead mill, colloid mill, roll mill, three-roll mill, mortar, rod mill, ball mill, jaw crusher, kneader, planetary mixer, etc. can be used, but there is no particular limitation. The removal of the solvent is not limited, and there are methods of heating to a temperature higher than the boiling point of the solvent, methods of reducing pressure, methods of increasing pressure, and methods of combining them. After removing the solvent, a known method such as drying can also be used to produce a powder.

[0067] The obtained porous silica encapsulating a UV absorber can be evaluated for its physicochemical state by methods such as scanning electron microscopy, powder X-ray diffraction measurement, differential scanning calorimetry, etc. In addition, a dissolution curve can be prepared by a dissolution test to confirm the dissolution of the UV absorber encapsulated in the porous silica. The average particle size of the obtained porous silica encapsulating a UV absorber can be measured by known methods such as a light scattering photometer and a transmission electron microscope.

[0068] The amount of the ultraviolet absorber encapsulated in the porous silica is preferably 30 to 50% by mass, more preferably 35 to 45% by mass, for example, of the ultraviolet absorber encapsulated in the porous silica.

[0069] As the component (A1), any of the following embodiments may be used, for example: an embodiment in which a plurality of ultraviolet absorbers are encapsulated in one porous silica; an embodiment in which the first porous silica encapsulating the first ultraviolet absorber is used in combination with the second porous silica encapsulating the second ultraviolet absorber; or an embodiment in which the first porous silica encapsulating one ultraviolet absorber is combined with the second porous silica encapsulating the same ultraviolet absorber, and the first porous silica and the second porous silica have different parameters (for example, the average particle size of the porous silica and the encapsulation rate of the ultraviolet absorber).

[0070] After encapsulating the ultraviolet absorber, the component (A1) can be surface-treated. The type or concentration of the surface treatment is not particularly limited. Examples of the type of surface treatment include silica, alginic acid, alumina (aluminum oxide), POE / polydimethylsiloxane copolymer, polyethylene glycol, aluminum hydroxide, amino acid, metal soap, diethanolamine salt of perfluoroalkyl ethyl phosphate, fluoroalkyl acrylate / polyalkylene glycol acrylate polymer, perfluoropolyether phosphate, anionic or cationic polymer having a perfluoropolyether chain, hydrogenated lecithin, acylated amino acid, α-tocopherol phosphate, methylhydrogen polysiloxane, α-monoalkoxy polydimethylsiloxane, α-dialkoxy polydimethylsiloxane, triethoxysilylethyl polydimethylsilanylethyl polydimethylsiloxane, amino-terminated polydimethylsiloxane, triethoxyoctanoyl silane, aminopropyltriethoxysilane, perfluorooctylethyltriethoxysilane, perfluorooctyltriethoxysilane, etc., and multiple surface treatments can also be carried out.

[0071] From the viewpoint of more significantly exerting the effects of this embodiment, the content of the porous silica encapsulating the ultraviolet absorber of the component (A1) in the emulsified external composition of this embodiment is preferably 0.0001% by mass or more, more preferably 0.001% by mass or more, further preferably 0.01% by mass or more, preferably 10% by mass or less, more preferably 5% by mass or less, and further preferably 3% by mass or less, based on the total amount of the composition.

[0072] From the viewpoint of significantly exerting the effects of this embodiment, in the emulsified external composition of this embodiment, the content of the component (A1) is preferably 0.0001 part by mass or more, more preferably 0.001 part by mass or more, further preferably 0.01 part by mass or more, preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and further preferably 1 part by mass or less, relative to 1 part by mass of the component (C1).

[0073] ((B) Nonionic surfactant)

[0074] From the viewpoint of more significantly exerting the effects of the present solution, the emulsifying external composition of the present solution may further contain one or more nonionic surfactants as the component (B). The nonionic surfactant is not particularly limited as long as it can be used in the emulsifying external composition. It should not be limited to a specific mechanism, but it is presumed that by using the nonionic surfactant to improve the dispersibility of the component (A1), it is also easy to interact with the component (C1), contributing to improving the ultraviolet absorption effect.

[0075] As nonionic surfactants, for example, sorbitan fatty acid esters can be mentioned (for example, sorbitan isostearate (HLB = 5.0), sorbitan laurate (HLB = 8.5), sorbitan palmitate (HLB = 6.7), sorbitan stearate (HLB = 4.7), diglycerol sorbitan penta-2-ethylhexanoate, diglycerol sorbitan tetra-2-ethylhexanoate, etc.); propylene glycol fatty acid esters (for example, propylene glycol monostearate (HLB = 3.5), etc.); hydrogenated castor oil derivatives (for example, polyoxyethylene hydrogenated castor oil 40 (HLB = 12.5), polyoxyethylene hydrogenated castor oil 50 (HLB = 13.5), polyoxyethylene hydrogenated castor oil 60 (HLB = 14.0), polyoxyethylene hydrogenated castor oil 80 (HLB = 15.0), etc.); polyoxyethylene sorbitan fatty acid esters (for example, polyoxyethylene (20) sorbitan laurate (polysorbate 20), polyoxyethylene (20) sorbitan stearate (polysorbate 60) (HLB = 15.0), polyoxyethylene (20) sorbitan oleate (polysorbate 80) (HLB = 15.0), polyoxyethylene (20) sorbitan isostearate (HLB = 15.0), etc.); glycerol derivatives (for example, glyceryl stearate (HLB = 3.0), polyglyceryl-10 pentaisostearate (HLB = 3.5), polyglyceryl-10 stearate (HLB = 12.0), polyglyceryl-10 isostearate (HLB = 12.0), PEG-7 glyceryl cocoate (HLB = 13.0), glyceryl stearate alkyl ether); polyoxyalkylene alkyl ethers (for example, polyoxyethylene lauryl ether (HLB = 12.0), etc.); silicone-based surfactants (for example, polyoxyethylene-methylpolysiloxane copolymer, lauryl PEG-9 dimethicone copolyol (HLB = 3.0), PEG-9 dimethicone copolyol (HLB = 4.0), bis-PEG-18 methyl ether dimethicone (HLB = 17.0), etc.); polyethylene glycol fatty acid esters (for example, PEG-10 stearate (HLB = 11.0), PEG-25 stearate (HLB = 15.0), PEG-40 stearate (HLB = 17.5)); alkyl glucosides, etc.

[0076] From the viewpoint of more significantly exerting the effects of this solution, the HLB value of the nonionic surfactant is preferably 2 to 20, more preferably 4 to 19. As nonionic surfactants having an HLB of 2 or more and less than 4, for example, any single one or a combination of two or more selected from the group consisting of propylene glycol monostearate, glyceryl stearate, polyglyceryl-10 pentaisostearate, and lauryl PEG-9 dimethicone copolyol can be mentioned.

[0077] As a nonionic surfactant having an HLB of 4 or more and less than 6, for example, any one or a combination of two or more selected from the group consisting of sorbitan isostearate, sorbitan stearate, and PEG-9 dimethylsiloxane oxyethyl polydimethylsiloxane can be mentioned.

[0078] As a nonionic surfactant having an HLB of 6 or more and less than 9, for example, any one or a combination of two or more selected from the group consisting of sorbitan laurate and sorbitan palmitate can be mentioned.

[0079] As a nonionic surfactant having an HLB of 9 or more and less than 14, for example, any one or a combination of two or more selected from the group consisting of polyoxyethylene hydrogenated castor oil 20, polyoxyethylene hydrogenated castor oil 40, polyoxyethylene hydrogenated castor oil 50, polyglycerol stearate-10, polyglycerol isostearate-10, polyoxyethylene PEG-7 glyceryl monocaprylate, polyoxyethylene lauryl cetyl ether, and PEG-6 stearate can be mentioned.

[0080] As a nonionic surfactant having an HLB of 14 or more and less than 18, for example, any one or a combination of two or more selected from the group consisting of polyoxyethylene hydrogenated castor oil 60, polyoxyethylene hydrogenated castor oil 80, polyoxyethylene (20) sorbitan stearate, polyoxyethylene (20) sorbitan oleate, polyoxyethylene (20) sorbitan isostearate, bis-PEG-18 methyl ether dimethylsilane, PEG-25 stearate, PEG-40 stearate, PEG-55 stearate, and PEG-25 isostearate can be mentioned.

[0081] In this specification, the HLB value is not particularly limited and may be a calculated value or a value obtained by experiment. The calculated value can be, for example, a calculated value based on the Griffin method (20 × sum of the formula weights of the hydrophilic part / molecular weight).

[0082] From the viewpoint of more significantly exerting the effects of this solution, the content of the nonionic surfactant in the emulsified external composition is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, further preferably 0.3% by mass or more, preferably 5% by mass or less, more preferably 4% by mass or less, and further preferably 3% by mass or less, based on the total amount of the composition.

[0083] ((C2) Other ultraviolet absorbers)

[0084] The emulsified external composition of the present solution may further contain an ultraviolet absorber in a form not encapsulated in the silica particles as the component (A1). Examples of such an ultraviolet absorber include at least one selected from the ultraviolet absorbers that can be used as the component (A1).

[0085] From the viewpoint of more significantly exerting the effects of the present solution, the content of the component (C2) in the emulsified external composition is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, still more preferably 0.5% by mass or more, preferably 10% by mass or less, more preferably 5% by mass or less, and still more preferably 3% by mass or less, relative to the total amount of the composition.

[0086] (Effect)

[0087] As shown in the examples, the emulsified external composition of the present solution can improve the ultraviolet absorption effect in the coexistence of the component (C1) and the component (A1). Although not limited to a specific mechanism, it is presumed that such an improvement in the ultraviolet absorption effect is due to the transfer of energy or particles (e.g., electrons) between the ultraviolet absorber of the component (C1) and the component (A1) via the porous silica.

[0088] Moreover, in the emulsified external composition of the present solution, the ultraviolet absorption efficiency of the component (C1) is improved, and as a result, the absorption efficiency of ultraviolet light is good. For example, from the viewpoint of more significantly exerting the effects of the present solution, the rate of change in the absorbance of the emulsified external composition of the present solution with respect to the ultraviolet light at a wavelength of 310 nm compared to the comparative composition can be preferably 5% or more, more preferably 10% or more, still more preferably 15% or more, and even more preferably 20% or more. The larger the value of the rate of change, the higher the ultraviolet absorption effect.

[0089] In addition, in the emulsified external composition of the present solution, the amount of the component (C1) used can be controlled, so the degree of freedom in formulation and form is high, and a good composition can be prepared. Moreover, as shown in the examples, the emulsified external composition of the present solution has a better feeling in use than a composition in which the ultraviolet absorber is not encapsulated in the porous silica.

[0090] [Method for enhancing ultraviolet absorption ability]

[0091] Another aspect relates to a method for enhancing the ultraviolet absorption ability of an emulsified external composition. The method is characterized by including: in the emulsified external composition, causing (C1) diethylamino hydroxybenzoyl benzoic acid hexyl ester to coexist with (A1) porous silica encapsulating an ultraviolet absorber. Here, the porous silica encapsulating the ultraviolet absorber is preferably porous silica encapsulating an ultraviolet absorber other than diethylamino hydroxybenzoyl benzoic acid hexyl ester. For example, porous silica encapsulating bis-ethylhexyloxyphenol methoxyphenyl triazine is preferred.

[0092] The state in which the component (C1) and the component (A1) coexist follows the embodiment of the emulsified external composition described in the item of [First Embodiment: Emulsified External Composition] above. Other specific embodiments such as the types and contents of the component (C1), the component (A1), and other components of the above method follow the content described in the item of [First Embodiment: Emulsified External Composition] above.

[0093] [Second Embodiment: Emulsified External Composition]

[0094] In the second embodiment of the present invention, an emulsified external composition is provided, which is an emulsified external composition containing (A2) porous silica encapsulating an ultraviolet absorber and (B) a nonionic surfactant. Among them, the average particle size of the porous silica is 1.4 to 40 μm, the porous silica is porous silica encapsulating an ultraviolet absorber that is solid at 25°C, and the encapsulation rate of the ultraviolet absorber with respect to the porous silica is 30 to 50%.

[0095] The emulsified external composition with such a configuration can take into account both excellent ultraviolet absorption ability and good usability.

[0096] ((A2) Porous silica encapsulating an ultraviolet absorber)

[0097] In the component (A2), the ultraviolet absorber may be any ultraviolet absorber that is solid at 25°C and can be used in an external composition, and there is no particular limitation. One compound may be used alone, or two or more compounds may be used in combination. Such an ultraviolet absorber is preferably at least one selected from the group consisting of triazine derivative ultraviolet absorbers, benzylidene camphor-based ultraviolet absorbers, phenylbenzotriazole-based ultraviolet absorbers, salicylic acid-based ultraviolet absorbers, cinnamic acid-based ultraviolet absorbers, benzoylmethane-based ultraviolet absorbers, benzoate derivative ultraviolet absorbers, benzylidene malonate derivative ultraviolet absorbers, octocrylene-based ultraviolet absorbers, imidazole sulfonic acid derivative ultraviolet absorbers, and benzophenone derivative ultraviolet absorbers, and more preferably at least one selected from the group consisting of triazine derivative ultraviolet absorbers, benzylidene camphor-based ultraviolet absorbers, and phenylbenzotriazole-based ultraviolet absorbers.

[0098] Specific examples of such ultraviolet absorbers are not limited, but are preferably selected from the group consisting of bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT) (alias: 2,4-bis-[{4-(2-ethylhexyloxy)-2-hydroxy}-phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine), diethylamino hydroxybenzoyl benzoic acid hexyl ester (DHHB), methylhexyl triazone, methylene bis-benzotriazolyl tetramethylbutylphenol (alias: 2,2'-methylene bis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol]), terephthalylidene dicamphor sulfonic acid, cresol triazole trisiloxane, ethylhexyl triazone (alias: 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]1,3,5-triazine), and phenylbenzimidazole sulfonic acid.

[0099] Herein, a more preferred component (A2) is porous silica encapsulating diethylamino hydroxybenzoyl benzoic acid hexyl ester (DHHB), tert-butyl methoxydibenzoylmethane (BM-DBM), or bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT).

[0100] In the component (A2), the porous silica encapsulating the ultraviolet absorber only needs to have pores capable of encapsulating the ultraviolet absorber, and there is no particular limitation. One or more kinds of porous silica can be used. From the viewpoint of good usability, the shape of the porous silica is preferably spherical or granular.

[0101] Regarding the size of the porous silica, the average particle diameter of the porous silica can be preferably set to 1.4 μm or more, more preferably 2 μm or more. From the viewpoint of good usability, the average particle diameter of the porous silica can be preferably set to 40 μm or less, more preferably 30 μm or less, further preferably 20 μm or less, and even more preferably 10 μm or less. The average particle diameter of the porous silica can be preferably 1.4 μm to 40 μm, more preferably 2 μm to 30 μm. Herein, the average particle diameter represents the average particle diameter in the volume-based particle size distribution measured using a laser diffraction scattering type particle size distribution measuring device.

[0102] The oil absorption of the porous silica is not particularly limited, preferably 80 mL / 100 g or more, more preferably 90 mL / 100 g or more, still more preferably 100 mL / 100 g or more, and preferably 400 mL / 100 g or less, more preferably 350 mL / 100 g, still more preferably 200 mL / 100 g. For example, although not limited, it can be preferably set to 90 mL / 100 g to 350 mL / 100 g, more preferably set to 100 mL / 100 g to 300 mL / 100 g, still more preferably set to 100 mL / 100 g to 200 mL / 100 g. The oil absorption can be confirmed by the oil absorption obtained by using the general test method for determining the oil absorption of pigments and extender pigments in JIS K 5101-13-1.

[0103] As the porous silica, for example, commercially available products such as SUNSPHERE (manufactured by AGC Si-Tech Co., Ltd.), COSMESILICA (manufactured by Fuji Silysia Chemical Ltd.), Mizupearl (manufactured by Mizusawa Chemical Industry Co., Ltd.), SILICAMICRO BEAD (manufactured by JGC Catalysts & Chemicals Ltd.), Pulzea SIT-40, Pulzea SIZ-30 (manufactured by Suzuki Oil & Fat Co., Ltd.), Godd Ball B-25C, Godd Ball D-25C (manufactured by Suzuki Oil & Fat Co., Ltd.) can be used.

[0104] The surface of the porous silica can also be treated with inorganic fine particles such as metal oxides such as titanium oxide and zinc oxide. The coating layer can be about 10 to 40% by mass in the porous silica.

[0105] (A2) The porous silica encapsulating the ultraviolet absorber can be produced, for example, by adding porous silica to a solution prepared by dissolving the ultraviolet absorber in a solvent, impregnating the porous silica with the ultraviolet absorber, and then removing the solvent. The solvent only needs to dissolve the ultraviolet absorber, and there are no restrictions on its type or number of components. Known solvents can be used. In the solution prepared by dissolving the ultraviolet absorber in a solvent, a solvent in which the porous silica is more preferably uniformly dispersed is preferred. The solvent is not limited, and examples thereof include toluene, cyclohexane, hexane, xylene, ethyl acetate, butyl acetate, etc., with toluene being preferred. As the solvent used herein, for example, it is preferably free of methanol or substantially free of methanol (e.g., 1% by mass or less), but there are no restrictions. The porous silica can be impregnated with the ultraviolet absorber by stirring and mixing using a known method. For example, as the stirring method, a magnetic stirrer, mixer, ultrasonic wave, homogenizer, high-pressure homogenizer, dispersion mixer, bead mill, colloid mill, roll mill, three-roll mill, mortar, rod mill, ball mill, jaw crusher, kneader, planetary mixer, etc. can be used, but there are no particular restrictions. The removal of the solvent is not limited, and methods include heating to a temperature higher than the boiling point of the solvent, reducing pressure, increasing pressure, or a combination of them. After removing the solvent, known methods such as drying can also be used to produce a powder.

[0106] The physical and chemical state of the obtained porous silica encapsulating the ultraviolet absorber can be evaluated by methods such as scanning electron microscopy, powder X-ray diffraction measurement, differential scanning calorimetry, etc. In addition, a dissolution curve can be prepared by a dissolution test to confirm whether there is dissolution of the ultraviolet absorber encapsulated in the porous silica. The average particle size of the obtained porous silica encapsulating the ultraviolet absorber can be measured by known methods such as a light scattering photometer and a transmission electron microscope.

[0107] (A2) The amount of the ultraviolet absorber encapsulated in the porous silica is 30 to 50% by mass, preferably 35 to 45% by mass. By further coexisting the porous silica having such an amount of the encapsulated ultraviolet absorber with (B) a nonionic surfactant, a sufficient ultraviolet absorption effect can be obtained.

[0108] As the component (A2), for example, any of the following schemes can be used: a scheme in which a plurality of ultraviolet absorbers are encapsulated in one kind of porous silica; a scheme in which the first porous silica encapsulating the first ultraviolet absorber is used in combination with the second porous silica encapsulating the second ultraviolet absorber; or a combination of the first porous silica encapsulating one ultraviolet absorber and the second porous silica encapsulating the same ultraviolet absorber, and a combination scheme in which the first porous silica and the second porous silica have different parameters (e.g., the average particle size of the porous silica, the encapsulation rate of the ultraviolet absorber).

[0109] From the viewpoint of more significantly exerting the effects of the present solution, the content of the porous silica encapsulating the ultraviolet absorber in the emulsified external composition is preferably 0.0001% by mass or more, more preferably 0.001% by mass or more, further preferably 0.01% by mass or more, preferably 10% by mass or less, more preferably 5% by mass or less, and further preferably 3% by mass or less, relative to the total amount of the composition.

[0110] ((B) Nonionic surfactant)

[0111] The emulsified external composition in the second solution of the present solution further contains one or more nonionic surfactants as component (B). The nonionic surfactant is not particularly limited as long as it can be used in an external composition. It should not be limited to a specific mechanism, but the dispersibility is improved by the nonionic surfactant, which can contribute to improving the ultraviolet absorption effect.

[0112] As nonionic surfactants, for example, sorbitan fatty acid esters can be mentioned (e.g., sorbitan isostearate (HLB = 5.0), sorbitan laurate (HLB = 8.5), sorbitan palmitate (HLB = 6.7), sorbitan stearate (HLB = 4.7), diglycerol sorbitan penta-2-ethylhexanoate, diglycerol sorbitan tetra-2-ethylhexanoate, etc.); propylene glycol fatty acid esters (e.g., propylene glycol monostearate (HLB = 3.5), etc.); hydrogenated castor oil derivatives (e.g., polyoxyethylene hydrogenated castor oil 40 (HLB = 12.5), polyoxyethylene hydrogenated castor oil 50 (HLB = 13.5), polyoxyethylene hydrogenated castor oil 60 (HLB = 14.0), polyoxyethylene hydrogenated castor oil 80 (HLB = 15.0), etc.); polyoxyethylene sorbitan fatty acid esters (e.g., polyoxyethylene (20) sorbitan laurate (polysorbate 20), polyoxyethylene (20) sorbitan stearate (polysorbate 60) (HLB = 15.0), polyoxyethylene (20) sorbitan oleate (polysorbate 80) (HLB = 15.0), polyoxyethylene (20) sorbitan isostearate (HLB = 15.0), etc.); glycerol derivatives (e.g., glyceryl stearate (HLB = 3.0), pentaisostearoyl polyglyceryl-10 (HLB = 3.5), polyglyceryl-10 stearate (HLB = 12.0), polyglyceryl-10 isostearate (HLB = 12.0), PEG-7 glyceryl cocoate (HLB = 13.0), glyceryl stearate alkyl ether); polyoxyalkylene alkyl ethers (e.g., polyoxyethylene lauryl ether (HLB = 12.0), etc.); silicone-based surfactants (e.g., polyoxyethylene-methylpolysiloxane copolymer, lauryl PEG-9 dimethicone copolyol (HLB = 3.0), PEG-9 dimethicone copolyol (HLB = 4.0), bis-PEG-18 methyl ether dimethicone (HLB = 17.0), etc.); polyethylene glycol fatty acid esters (e.g., PEG-10 stearate (HLB = 11.0), PEG-25 stearate (HLB = 15.0), PEG-40 stearate (HLB = 17.5)); alkyl glucosides, etc.

[0113] From the viewpoint of more significantly exerting the effects of this solution, the HLB value of the nonionic surfactant is preferably 2 to 20, more preferably 4 to 19, further preferably 8 to 18, and still more preferably 9.5 to 18. As nonionic surfactants having an HLB of 2 or more and less than 4, for example, any one or a combination of two or more selected from the group consisting of propylene glycol monostearate, glyceryl stearate, pentaisostearoyl polyglyceryl-10, and lauryl PEG-9 dimethicone copolyol can be mentioned.

[0114] As a nonionic surfactant having an HLB of 4 or more and less than 6, for example, any one or a combination of two or more selected from the group consisting of sorbitan isostearate, sorbitan stearate, and PEG-9 dimethicone copolyol can be cited.

[0115] As a nonionic surfactant having an HLB of 6 or more and less than 9, for example, any one or a combination of two or more selected from the group consisting of sorbitan laurate and sorbitan palmitate can be cited.

[0116] As a nonionic surfactant having an HLB of 9 or more and less than 14, for example, any one or a combination of two or more selected from the group consisting of polyoxyethylene hydrogenated castor oil 20, polyoxyethylene hydrogenated castor oil 40, polyoxyethylene hydrogenated castor oil 50, polyglyceryl stearate-10, polyglyceryl isostearate-10, polyoxyethylene PEG-7 glyceryl monocaprylate, polyoxyethylene lauryl cetyl ether, and PEG-6 stearate can be cited.

[0117] As a nonionic surfactant having an HLB of 14 or more and less than 18, for example, any one or a combination of two or more selected from the group consisting of polyoxyethylene hydrogenated castor oil 60, polyoxyethylene hydrogenated castor oil 80, polyoxyethylene (20) sorbitan stearate, polyoxyethylene (20) sorbitan oleate, polyoxyethylene (20) sorbitan isostearate, bis-PEG-18 methyl ether dimethylsilane, PEG-25 stearate, PEG-40 stearate, PEG-55 stearate, and PEG-25 isostearate can be cited.

[0118] In this specification, the HLB value is not particularly limited and may be a calculated value or a value obtained experimentally. The calculated value can be, for example, a calculated value based on the Griffin method (20 × sum of the formula weights of the hydrophilic moieties / molecular weight).

[0119] From the viewpoint of more significantly exerting the effects of this solution, the content of the nonionic surfactant in the emulsified external composition of this solution is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, further preferably 0.3% by mass or more, preferably 5% by mass or less, more preferably 4% by mass or less, and further preferably 3% by mass or less, relative to the total amount of the composition.

[0120] Regarding the content ratio of the porous silica encapsulating an ultraviolet absorber (A2) and the nonionic surfactant (B) in the emulsified external composition of this formulation, relative to 1 part by mass of the porous silica encapsulating the ultraviolet absorber (A2), the amount of the nonionic surfactant (B) is preferably 10 to 1000 parts by mass, more preferably 20 to 1000 parts by mass, and still more preferably 50 to 1000 parts by mass. ((C3) Other ultraviolet absorbers)

[0121] In the second embodiment of the present invention, the emulsified external composition may further contain a UV absorber other than the UV absorber encapsulated in (A2) porous silica as the (C3) component. Such a UV absorber is not limited, and for example, a scheme in which it is present in the emulsified external composition without being encapsulated in silica particles is preferred. As such a UV absorber, for example, it may be selected from the group consisting of bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT) (alias: 2,4-bis-[(4-(2-ethylhexyloxy)-2-hydroxy}-phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine), methylene bis-benzotriazolyl tetramethylbutylphenol (alias: 2,2'-methylene bis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol]), terephthalylidene dicamphor sulfonic acid, cresyl triazone, ethylhexyl triazone (alias: 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]1,3,5-triazine), phenylbenzimidazole sulfonic acid, 4-tert-butyl-4'-methoxydibenzoylmethane (alias: tert-butylmethoxydibenzoylmethane, alias: avobenzone), 2-ethylhexyl dimethoxybenzylidene dioxoimidazoline propionate, disodium dihydroxydimethoxybenzophenone disulfonate, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid and its salts, dihydroxydimethoxybenzophenone, dihydroxybenzophenone, tetrahydroxybenzophenone (oxybenzone-2), dihydroxybenzophenone, ferulic acid, octyl salicylate (2-ethylhexyl salicylate), homomenthyl salicylate, terphenyl triazine, 2,5-diisopropylcinnamic acid methyl ester, di-2-ethylhexyl glycerol monomethoxycinnamate, 2-ethylhexyl p-methoxycinnamate (alias: ethylhexyl methoxycinnamate), cinoxate, isopropyl p-methoxycinnamate - cinnamic acid diisopropyl ester mixture, polydimethylsiloxane diethylbenzylidenemalonate, 2-cyano-3,3-diphenylprop-2-enoic acid 2-ethylhexyl ester (alias: octocrylene), 2-phenylbenzimidazole-5-sulfonic acid, p-aminobenzoic acid (hereinafter, simply referred to as "PABA") or its derivatives (PABA ethyl ester, dipropyl PABA ethyl ester, dimethyl PABA ethylhexyl ester, PABA glycerol ester, etc.), 4-(2-β-glucopyranosyloxy)propoxy-2-hydroxybenzophenone, 1-(3,4-dimethoxyphenyl)-4,4-dimethyl-1,3-pentanedione, methyl bis(trimethylsiloxysilyl)isopentyl trimethoxycinnamate, and pentyl p-dimethylaminobenzoate, and more preferably at least one selected from the group consisting of bis-ethylhexyloxyphenol methoxyphenyl triazine, methylene bis-benzotriazolyl tetramethylbutylphenol, terephthalylidene dicamphor sulfonic acid, terephthalylidene dicamphor sulfonic acid, cresyl triazone, ethylhexyl triazone, and phenylbenzimidazole sulfonic acid.

[0122] From the viewpoint of more significantly exerting the effects of the present solution, the content of the component (C3) in the emulsified external composition is preferably 5% by mass or more, more preferably 8% by mass or more, still more preferably 10% by mass or more, preferably 25% by mass or less, more preferably 20% by mass or less, and still more preferably 15% by mass or less, relative to the total amount of the composition.

[0123] (Effect)

[0124] As shown in the examples, the emulsified external composition of the present solution can seek to balance the enhancement of ultraviolet absorption ability and the usability. In particular, for example, in the coexistence of the component (A2) and the component (B), the ultraviolet absorption ability can be significantly improved.

[0125] [Common optional components, manufacturing methods, etc. of the first and second solutions]

[0126] ((D) Ultraviolet scattering component)

[0127] The composition of the present invention may further contain an ultraviolet scattering component as the component (D). Examples of the ultraviolet scattering component include inorganic compounds such as zinc oxide, titanium oxide, iron oxide, cerium oxide, zirconium oxide, titanium silicate, zinc silicate, silicon anhydride, cerium silicate, and hydrated silicic acid; substances obtained by coating these inorganic compounds with inorganic powders such as hydrated silicic acid, aluminum hydroxide, mica, or talc; substances obtained by compounding these inorganic compounds with resin powders such as polyamide, polyethylene, polyester, polystyrene, or nylon; and substances obtained by treating or coating these inorganic compounds with silicone oil or aluminum fatty acid salts, etc.

[0128] Among them, inorganic compounds such as zinc oxide, titanium oxide, and iron oxide are preferred; substances obtained by treating or coating these inorganic compounds with inorganic powders such as aluminum hydroxide, hydrated silicic acid, mica, or talc, or silicone oil.

[0129] ((E) Active ingredient)

[0130] In order to impart a medicinal effect, the composition of the present invention may further contain an active ingredient as the component (E). The active ingredient is not limited, and various ingredients such as whitening functional ingredients, anti-inflammatory ingredients, antibacterial ingredients, cell activation ingredients, astringent ingredients, antioxidant ingredients, acne improvement ingredients, anti-aging ingredients, horny softening ingredients, and biosynthesis promoting ingredients such as collagen, blood circulation promoting ingredients, and moisturizing ingredients can be blended singly or in combination of two or more.

[0131] Among them, the composition of the present invention preferably contains at least a whitening functional ingredient. Examples of the whitening functional ingredient may include at least one ingredient selected from the group consisting of tocopherol, ascorbic acid and / or its salts, tranexamic acid, ascorbic acid derivatives, arbutin, 4-alkylresorcinols and / or their salts, 4-methoxysalicylic acid, hydroquinone, kojic acid, placenta extract, and plant ingredients having a whitening effect (for example, extracts of Phellodendron amurense, Saxifraga stolonifera, Aloe vera, etc.).

[0132] Examples of the anti-inflammatory ingredient may include glycyrrhetinic acid, glycyrrhic acid derivatives, azulene, ingredients derived from plants (for example, comfrey), zinc oxide, tocopheryl acetate, allantoin, aminocaproic acid, hydrocortisone, etc.

[0133] Examples of the antibacterial ingredient may include chlorhexidine, salicylic acid, benzalkonium chloride, ethacridine lactate (Acrinol), benzethonium chloride, cresol, gluconic acid and its derivatives, povidone iodine, potassium iodide, iodine, isopropylmethylphenol, triclocarban, triclosan, photosensitizer No. 101, photosensitizer No. 201, parabens, phenoxyethanol, 1,2-pentanediol, alkyl diaminoglycine hydrochloride, piroctone olamine, miconazole, etc.

[0134] Examples of the cell activation ingredient may include amino acids such as γ-aminobutyric acid, ε-aminocaproic acid, etc.; vitamins such as retinol, thiamine, riboflavin, pyridoxine hydrochloride, pantothenic acids, etc.; α-hydroxy acids such as glycolic acid, lactic acid, etc.; tannins, flavonoids, saponins, photosensitizer No. 301, etc.

[0135] Examples of the astringent ingredient may include zinc oxide, zinc sulfate, aluminum chloride, zinc phenolsulfonate, tannic acid, etc.

[0136] Examples of the antioxidant ingredient may include ingredients derived from plants (for example, grapes, Korean ginseng, comfrey, etc.); procyanidins, tocopherol and its derivatives, ascorbic acid and its derivatives, hesperidin and its derivatives, ergothioneine, sodium bisulfite, isoascorbic acid and its salts, flavonoids, glutathione, etc.

[0137] Examples of the anti-aging ingredient may include pantothenic acid, kinetin, ursolic acid, turmeric extract, sphingol derivatives, silicon, silicic acid, N-methyl-L-serine, mevalonolactone, etc.

[0138] Examples of the keratolytic ingredient may include lactic acid, salicylic acid, glycolic acid, gluconic acid, citric acid, malic acid, fruit acid, phytic acid, urea, sulfur, etc.

[0139] As the component for promoting blood circulation, components derived from plants (for example, Korean ginseng, ashitaba, arnica, ginkgo, fennel, sedum, Dutch oak, chamomile, Roman chamomile, carrot, gentian, burdock, rice, hawthorn, shiitake mushroom, ginger, hawthorn berry, juniper, chuanxiong, swertia, thyme, clove, tangerine peel, chili pepper, angelica, peach kernel, spruce, ginseng, garlic, butcher's broom, grape, peony, horse chestnut, honeywort, pomelo, coix seed, green tea, rosemary, rosehip, tangerine peel, angelica, spruce, peach, apricot, walnut, corn) can be mentioned; acetylcholine, ichthammol, cantharides tincture, γ-oryzanol, cepharanthine, tolazoline, tocopheryl nicotinate, glucosyl hesperidin, etc.

[0140] As the moisturizing component, for example, diglycerol trehalose can be mentioned; high molecular compounds such as sodium hyaluronate, heparin analogs, sodium chondroitin sulfate, collagen, elastin, keratin, chitin, chitosan, etc.; amino acids such as glycine, aspartic acid, arginine, etc.; natural moisturizing factors such as sodium lactate, urea, sodium pyrrolidone carboxylate, etc.; lipids such as ceramides, cholesterol, phospholipids, etc.; plant extracts such as chamomile extract, witch hazel extract, tea extract, perilla extract, etc.

[0141] (Other components)

[0142] In addition to containing the above components (A) to (E), the composition of the present invention can also contain various components that can be used as external preparations in the fields of pharmaceuticals, quasi-drugs or cosmetics within the range of amounts and qualities that do not impair the effects of the present invention, such as exfoliants, vitamins, peptides or their derivatives, amino acids or their derivatives, cleansing components, irritation reducers, thickeners, preservatives, colorants, dispersants, pH adjusters, fragrances and other components, as needed. These components can be contained alone or in combination of two or more arbitrarily. Water can also be contained.

[0143] (Manufacturing method, form, physical properties)

[0144] The emulsified external composition of the present invention can be made into various desired forms such as emulsion, paste, foam, gel, liquid, cream, sheet (substrate-supported), aerosol, spray, etc. by the following method: mixing the above-mentioned optional components as needed in the above components (A) to (E), further mixing other solvents, bases of commonly used external preparations, etc. as needed, and adjusting the pH as needed. They can be manufactured by the methods commonly used in the industry.

[0145] Specifically, the preparation method of the emulsified external composition of the present invention is not particularly limited, as long as appropriate heating, mixing, dispersion, etc. are carried out according to the components to be mixed. For example, a method of mixing a uniformly heated and dissolved oil phase with a uniformly heated and dissolved water phase, fully stirring with a homogenizer, and then cooling to room temperature can be mentioned.

[0146] In addition, the step of dispersing the component (A) can be carried out before or after the emulsification step, and in the case where aggregation is likely to occur, it can be carried out after the emulsification step.

[0147] The emulsified external composition of the present invention is preferably in the form of an oil-in-water emulsified external composition, and can be, for example, an emulsion-like or semi-solid composition. Here, there is no limitation, but as the content of the aqueous phase in the composition, it can be preferably 40 to 90% by mass, more preferably 50 to 90% by mass, and most preferably 60 to 90% by mass. The aqueous phase is the total amount of the aqueous solvent, and there is no limitation. For example, it can be the total amount of the aqueous solvent containing water, polyhydric alcohol, and ethanol.

[0148] From the viewpoints of suppressing irritation to the skin and mucous membranes and having a good feeling in use, the pH of the emulsified external composition of the present invention is preferably 4 to 9, more preferably 4 to 8, and further preferably 5 to 7.

[0149] The viscosity of the emulsified external composition of the present invention is not particularly limited. From the viewpoint of having a good feeling in use on the skin, for example, when measured at 25 °C using an E-type viscometer, the viscosity is, for example, 1 to 100,000 mPa·s, preferably 1 to 50,000 mPa·s, more preferably 1 to 40,000 mPa·s, and even more preferably 1 to 30,000 mPa·s. More specifically, the viscosity measurement method follows the method of measurement using a B-type viscometer (measurement time: 60 minutes).

[0150] In this specification, the spectral integral value at wavelengths of 280 nm to 400 nm represents the value calculated by integrating the absorbance in the region of wavelengths of 280 to 400 nm in the absorption spectrum of the emulsified external composition.

[0151] In this specification, the method for measuring the ultraviolet absorption effect of the emulsified external composition follows the method described in the examples.

[0152] (Use)

[0153] The emulsified external composition of the present invention is a drug, quasi-drug, cosmetic, etc., and can be used, for example, expecting an ultraviolet blocking effect and a sunburn prevention effect. The emulsified external composition of the present invention is particularly suitable for uses such as preventing and reducing the formation of spots and freckles caused by sunburn, reducing and preventing photo-degradation and photo-aging, in addition to the use of preventing sunburn. It can also be applied to uses such as anti-inflammation, anti-aging, antioxidant, and acne prevention.

[0154] The emulsified external composition of the present invention can be used, for example, as basic cosmetics such as sunscreen, essence, lotion, milk, cream, jelly, makeup primer, aqueous agent, oil agent, and facial mask; beauty cosmetics such as foundation, lipstick, lip balm, mascara, eyeshadow, eyeliner, eyebrow pencil, and nail polish; and cleaners such as facial cleanser, facial wash, and body wash. The emulsified external composition of the present invention is preferably a skin care product such as sunscreen, essence, lotion, milk, cream, or jelly.

[0155] (Usage and dosage)

[0156] The emulsified external composition of the present invention can be applied to the skin, hair, and nails, and is preferably applied to the skin. The emulsified external composition of the present invention can be used once a day to several times a day according to the usage and dosage known or commonly used according to the purpose.

[0157] In the first aspect of the present invention, the following emulsified external composition can be provided. [1]

[0159] An emulsified external composition containing (C1) diethylamino hydroxybenzoyl hexyl benzoate and (A1) porous silica encapsulating an ultraviolet absorber, wherein the average particle size of the porous silica is 1.4 to 40 μm, and the porous silica is porous silica encapsulating an ultraviolet absorber that is solid at 25°C. [2]

[0161] The emulsified external composition according to [1], wherein the ultraviolet absorber encapsulated in the component (A1) is at least one selected from the group consisting of diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, methylene bis-benzotriazolyl tetramethylbutylphenol, terephthalylidene dicamphor sulfonic acid, terephthalylidene dicamphor sulfonic acid, cresol triazole trisiloxane, ethylhexyl triazone, and phenylbenzimidazole sulfonic acid. [3]

[0163] The emulsified external composition according to [1] or [2], wherein the encapsulation rate of the ultraviolet absorber relative to the porous silica is 30 to 50%. [4]

[0165] The emulsified external composition according to any one of [1] to [3], wherein the content of the component (A1) is 0.0001 parts by mass or more and 10 parts by mass or less relative to 1 part by mass of the component (C1). [5]

[0167] The emulsified external composition according to any one of [1] to [4], further containing a nonionic surfactant. [6]

[0169] The emulsified external composition according to any one of [1] to [5], wherein the nonionic surfactant is sorbitan fatty acid ester or polyethylene glycol fatty acid ester. [7]

[0171] The emulsified external composition according to any one of [1] to [6], wherein the content of (C1) hexyl diethylaminohydroxybenzoylbenzoate is 0.5% by mass or more and 10% by mass or less. [8]

[0173] The emulsified external composition according to any one of [1] to [7], wherein the content of the component (A1) is 0.0001% by mass or more and 10% by mass or less.

[0174] In the second aspect of the present invention, an emulsified external composition in the following emulsified form can be provided. [9]

[0176] An emulsified external composition, which is an emulsified external composition containing (A2) porous silica encapsulating an ultraviolet absorber and (B) a nonionic surfactant, wherein the average particle diameter of the porous silica is 1.4 to 40 μm, the porous silica is porous silica encapsulating an ultraviolet absorber that is solid at 25°C, and the encapsulation rate of the ultraviolet absorber with respect to the porous silica is 30 to 50%.

[10]

[0178] The emulsified external composition according to [9], wherein the nonionic surfactant is a surfactant having an HLB value of 5.0 to 20.

[11]

[0180] The emulsified external composition according to [6] or [7], further comprising (C3) an ultraviolet absorber.

[12]

[0182] The emulsified external composition according to claim

[11] , wherein the (C3) ultraviolet absorber is hexyl diethylaminohydroxybenzoylbenzoate.

[13]

[0184] The emulsified external composition according to any one of [9] to

[12] , wherein the ultraviolet absorber encapsulated in the component (A2) is bis-ethylhexyloxyphenol methoxyphenyl triazine.

[14]

[0186] The emulsified external composition according to any one of [9] to

[13] , wherein the nonionic surfactant is sorbitan fatty acid ester or polyethylene glycol fatty acid ester.

[15]

[0188] The emulsified external composition according to any one of [9] to

[14] , wherein the content of the component (C3) is 5% by mass or more and 25% by mass or less.

[16]

[0190] The emulsified external composition according to any one of [9] to

[15] , wherein the content of the component (A2) is 0.0001% by mass or more and 10% by mass or less.

[0191] Examples

[0192] Next, the present invention will be specifically described by way of examples and test examples, but the present invention is not limited to the following examples and test examples. Unless otherwise specified, the unit of each component is % by mass.

[0193] The porous silica used in the following examples is as described below.

[0194] Silica A (average particle size 2.2 μm, oil absorption 150 mL / 100 g).

[0195] Silica B (average particle size 3 μm, oil absorption 120 mL / 100 g).

[0196] Silica C (average particle size 3 μm, oil absorption 300 mL / 100 g).

[0197] Silica D (average particle size 6.3 μm, oil absorption 110 mL / 100 g).

[0198] Silica E (average particle size 11 μm, oil absorption 140 mL / 100 g).

[0199] The water-in-oil emulsified external-use compositions shown in each table were prepared by conventional methods. For porous silica containing an ultraviolet absorber, bis-ethylhexyloxyphenol methoxyphenyl triazine was added to a toluene solvent and stirred to prepare a solution of bis-ethylhexyloxyphenol methoxyphenyl triazine. It was confirmed that the solid bis-ethylhexyloxyphenol methoxyphenyl triazine disappeared and was completely dissolved. Porous silica was added to the prepared solution and stirred. Next, the toluene solvent was removed by heating to a temperature higher than the boiling point of the toluene solvent, and dried to prepare porous silica containing an ultraviolet absorber (A). Gas chromatography was used to confirm that the toluene solvent in the dried (A) component was less than 500 ppm, and substantially no residue was left. The inclusion rate of the ultraviolet absorber in the (A) component can be calculated based on the amount of ultraviolet absorber used in the process of making the (A) component and the amount of porous silica used. In addition, by observing and comparing the silica containing BEMT and the silica used as a mother powder using a scanning electron microscope, it can also be confirmed that BEMT is contained by appearance observation. It was also confirmed by the dissolution test that the ultraviolet absorber encapsulated in the porous silica did not dissolve.

[0200] Next, the uniformly heated and dissolved oil phase and the uniformly heated and dissolved water phase were mixed, stirred sufficiently with a homogenizer, and then cooled to room temperature to prepare compositions of Examples and Comparative Examples.

[0201] [Test Example 1. Ultraviolet protection evaluation test]

[0202] (Evaluation of the rate of change of spectral integral value)

[0203] On a square PMMA (polymethyl methacrylate) plate ("Helioplate SB6" manufactured by HelioScreen), the 2 The external composition is evenly applied in an amount of coating, and naturally dried for 15 minutes to prepare a sample for measurement. For each sample, ultraviolet rays are irradiated from the same distance using an SPF (Sun Protection Factor) analyzer ("UV-2000SSPF Analyzer" manufactured by Labsphere). The spectral transmittance in the range of wavelengths of 280 to 400 nm is calculated for nine parts of a sample, and they are averaged to obtain a spectrum. The area value of the absorption spectrum with a wavelength of 280 nm to 400 nm, that is, the value calculated by integrating the absorbance in the region of wavelengths of 280 nm to 400 nm, is taken as the spectral integral value. The rate of change of the spectral integral value of the embodiment composition relative to the comparative example composition is calculated using Formula 1. The higher the value of the rate of change, the higher the ultraviolet absorption effect.

[0204] [Formula 1] Rate of change of spectrum integration value = (spectrum integration value of the embodiment / spectrum integration value of the comparative example) × 100 (%)

[0205] (Evaluation of the rate of change in absorbance at a wavelength of 310 nm)

[0206] On a square PMMA (polymethyl methacrylate) plate (“Helioplate SB6” manufactured by HelioScreen), an external composition was uniformly coated at a coating amount of 1.3 mg / cm 2 , and air-dried for 15 minutes to prepare a test sample. For each sample, ultraviolet rays were irradiated from the same distance using an SPF (Sun Protection Factor) analyzer (“UV-2000SSPF analyzer” manufactured by Labsphere). The absorbance at a wavelength of 310 nm was measured at nine positions of one sample. Their average value was taken as the absorbance of the external composition at a wavelength of 310 nm. The rate of change in absorbance at a wavelength of 310 nm of the composition of the example relative to the composition of the comparative example was calculated using Equation 2. The higher the value of the rate of change, the higher the ultraviolet absorption effect.

[0207] [Equation 2] Rate of change in absorbance at a wavelength of 310 nm = (Absorbance at a wavelength of 310 nm of the example / Absorbance at a wavelength of 310 nm of the comparative example) × 100 (%)

[0208] [Test Example 2. Use feeling evaluation test]

[0209] In addition, for each external composition, three professional cosmetic evaluators evaluated the use feeling when applying an equal amount on the arm based on the following evaluation criteria through consultation.

[0210] [Use feeling evaluation criterion: stickiness]

[0211] ◎: Very good, completely free of stickiness.

[0212] 〇: Good, basically free of stickiness.

[0213] Δ: Slightly sticky, but not uncomfortable.

[0214] ×: Sticky and uncomfortable.

[0215] [Use feeling evaluation criterion: skin-friendly feeling or moist feeling]

[0216] ◎: Both skin-friendly feeling and moist feeling are good.

[0217] 〇: There is a skin-friendly feeling and a moist feeling.

[0218] Δ: Slightly skin-friendly feeling and moist feeling.

[0219] ×: No skin-friendly feeling or moist feeling.

[0220] <Evaluation Criteria for Use Feel: Moisture Feel>

[0221] ◎: Extremely moist.

[0222] 〇: Moist.

[0223] Δ: Slightly moist.

[0224] ×: No moisture feel.

[0225] Using the compositions shown in Table 1, the evaluations of Test Example 1 and Test Example 2 above were carried out. For the change rate of the spectral integral value, the integral values of the compositions of Comparative Examples 1-2 to 1-4 and the integral values of the compositions of Examples 1-1 to 1-3 were calculated with respect to the integral value of the composition of Comparative Example 1-1, and the results are shown in Table 1. Compared with the corresponding comparative examples, the change rate of the spectral integral value of the compositions of each example increased significantly. In addition, in the examples, compared with the comparative examples, the increase amount of the change rate of the spectral integral value accompanying the increase in the DHHB content became larger. Therefore, it can be seen that compared with the case where BEMT coexists in the composition in a state not encapsulated in porous silica, by making BEMT coexist in the composition in a state encapsulated in porous silica, the ultraviolet absorption effect of the composition is significantly enhanced.

[0226] In addition, the compositions of the examples have a better use feel than the compositions of the comparative examples, and even when the content of DHHB increases, the use feel is still good.

[0227] [Table 1]

[0228]

[0229]

[0230] ※1: Sorbitan stearate HLB 4.7

[0231] ※2: PEG-40 stearate HLB 17.5

[0232] Using the compositions shown in Table 2, the evaluations of Test Example 1 and Test Example 2 above were carried out. For the rate of change in absorbance at a wavelength of 310 nm, the ratio of the absorbance of the composition of Example 2-1 to the absorbance of the composition of Comparative Example 2-1 was calculated, and the results are shown in Table 2. Compared with the corresponding comparative examples, the rate of change in absorbance of the compositions of each example increased significantly. In addition, in the examples, compared with the comparative examples, the increase in the rate of change in absorbance accompanying the increase in the DHHB content became larger. Therefore, it was found that the ultraviolet absorption effect of the emulsified external composition was significantly enhanced by coexisting BEMT in the composition in a state of being encapsulated in porous silica compared with the case of coexisting BEMT in the composition in a state of not being encapsulated in porous silica.

[0233] In addition, the composition of the example had a better usability than the composition of the comparative example, and even when the content of DHHB increased, the usability was good.

[0234] [Table 2]

[0235]

[0236]

[0237] Using the compositions shown in Table 3, the evaluations of Test Example 1 and Test Example 2 above were carried out. For the rate of change in absorbance at a wavelength of 310 nm, the ratio of the absorbance of the compositions of Comparative Examples 3-2 to 3-3 and Examples 3-1 to 3-5 to the absorbance of the composition of Comparative Example 3-1 was calculated, and the results are shown in Table 3. For the rate of change in the spectral integral value, the integral values of the compositions of Comparative Examples 3-1 to 3-3 and the integral values of the compositions of Examples 3-1 to 3-5 with respect to the integral value of the composition of Comparative Example 3-1 were calculated, and the results are shown in Table 3.

[0238] Compared with the corresponding comparative example compositions, the rate of change in absorbance at a wavelength of 310 nm and the rate of change in the spectral integral value of the compositions of each example increased significantly. It was found that the ultraviolet absorption effect was enhanced in the coexistence of porous silica encapsulating the ultraviolet absorber and the surfactant.

[0239] In addition, the composition of the example had a better usability than the composition of the comparative example. That is, the composition of the example had a good usability with good greasiness, skin-friendly feeling, or moist feeling and moist and smooth feeling.

[0240] [Table 3]

[0241]

[0242]

[0243] Using the compositions shown in Table 4, the evaluations of Test Example 1 and Test Example 2 above were carried out. For the rate of change of absorbance at a wavelength of 310 nm, the absorbances of the compositions of Examples 4-1 to 4-10 were calculated relative to the absorbance of the composition of Comparative Example 4-1, and the results are shown in Table 4.

[0244] Compared with the corresponding comparative examples, the rate of change of absorbance at a wavelength of 310 nm of the emulsified external use compositions of each example increased significantly. It can be seen that in the coexistence of porous silica encapsulating an ultraviolet absorber and a surfactant, the ultraviolet absorption effect is enhanced.

[0245] In addition, the compositions of the examples have a better feel in use than the compositions of the comparative examples. That is, the compositions of the examples have a good feel in use with both a sticky feeling, a skin-friendly feeling, or a moist feeling, and a moist and smooth feeling.

[0246] [Table 4]

[0247]

[0248]

[0249] Using the compositions shown in Table 5, the evaluations of Test Example 1 and Test Example 2 above were carried out. For the rate of change of absorbance at a wavelength of 310 nm, the rate of change relative to the corresponding example of the comparative example was calculated, and the results are shown in Table 5. For the rate of change of the spectral integral value, the rate of change relative to the corresponding example of the comparative example was also calculated in the same way, and the results are shown in Table 5. For example, the value of Example 5-1 is expressed as the rate of change based on the comparison with Comparative Example 5-1, and the value of Example 5-2 is expressed as the rate of change based on the comparison with Comparative Example 5-2.

[0250] Compared with the compositions of their corresponding comparative examples, the rate of change of absorbance at a wavelength of 310 nm of the compositions of each example increased significantly. It can be seen that in the coexistence of porous silica encapsulating an ultraviolet absorber and a surfactant, the ultraviolet absorption effect is enhanced.

[0251] In addition, the compositions of the examples have a better feel in use than the compositions of the comparative examples. That is, the compositions of the examples have a good feel in use with both a sticky feeling, a skin-friendly feeling, or a moist feeling, and a moist and smooth feeling.

[0252] [Table 5]

[0253]

[0254]

[0255] Next, using the compositions shown in Table 6, the evaluations of Test Example 1 and Test Example 2 above were carried out. For the rate of change in absorbance at a wavelength of 310 nm, the ratio of the absorbance of the compositions of Examples 6-1 to 6-5 to the absorbance of the composition of Comparative Example 6-1 was calculated, and the results are shown in Table 6.

[0256] Compared with the compositions of the corresponding comparative examples, the rate of change in absorbance at a wavelength of 310 nm of the compositions of each example increased significantly. It can be seen that in the coexistence of porous silica encapsulating an ultraviolet absorber and a surfactant, the ultraviolet absorption effect is enhanced.

[0257] In addition, the compositions of the examples generally had a good feel in use. That is, the compositions of the examples had a good feel in use with both a non-greasy feeling, a skin-friendly feeling, or a moist feeling, and a watery feeling being good.

[0258] [Table 6]

[0259]

[0260]

[0261] Next, using the compositions shown in Table 7, the evaluations of Test Example 1 and Test Example 2 above were carried out. For the rate of change in absorbance at a wavelength of 310 nm, the ratio of the absorbance of the compositions of Examples 7-1 to 7-3 to the absorbance of the composition of Comparative Example 7-1 was calculated, and the results are shown in Table 7.

[0262] Compared with the compositions of the corresponding comparative examples, the rate of change in absorbance at a wavelength of 310 nm of the compositions of each example increased. It can be seen that in the coexistence of porous silica encapsulating an ultraviolet absorber and a surfactant, the ultraviolet absorption effect is enhanced.

[0263] In addition, the compositions of the examples had a good feel in use. That is, the compositions of the examples had a good feel in use with both a non-greasy feeling, a skin-friendly feeling, or a moist feeling, and a watery feeling being good.

[0264] [Table 7]

[0265]

[0266]

[0267] Next, using the compositions shown in Table 8, the evaluations of Test Example 1 and Test Example 2 above were carried out. For the rate of change in absorbance at a wavelength of 310 nm, the ratio of the absorbance of the compositions of Examples 8-1 to 8-3 to the absorbance of the composition of Comparative Example 8-1 was calculated, and the results are shown in Table 8.

[0268] The change rate of the absorbance at a wavelength of 310 nm of the emulsified external composition of each example was significantly increased compared with its corresponding comparative example. It was found that the ultraviolet absorption effect was enhanced in the coexistence of porous silica encapsulating an ultraviolet absorber and a surfactant. In addition, the feel in use of the composition of the example was generally good.

[0269] [Table 8]

[0270]

[0271]

Claims

1. An emulsified topical composition, which is a topical composition containing diethylamino hydroxybenzoyl hexyl benzoate and (A) porous silica encapsulating an ultraviolet absorber, wherein, The average particle size of the porous silica is 1.4 to 40 μm, The porous silica is a porous silica encapsulating an ultraviolet absorber that is solid at 25°C.

2. The emulsified topical composition according to claim 1, wherein, The ultraviolet absorber encapsulated in the component A is at least one selected from the group consisting of diethylamino hydroxybenzoyl benzoic acid hexyl ester, bis-ethylhexyloxyphenol methoxyphenyl triazine, methylene bis-benzotriazolyl tetramethylbutylphenol, terephthalylidene dicamphor sulfonic acid, terephthalylidene dicamphor sulfonic acid, cresol triazole trisiloxane, ethylhexyl triazone, and phenylbenzimidazole sulfonic acid.

3. The emulsified topical composition according to claim 1, wherein, The encapsulation rate of the ultraviolet absorber relative to the porous silica is 30 to 50%.

4. A method for enhancing the ultraviolet absorption ability of diethylamino hydroxybenzoyl hexyl benzoate, which comprises: Diethylamino hydroxybenzoyl benzoic acid hexyl ester coexists with the porous silica (A) encapsulating an ultraviolet absorber.

5. A method for producing an emulsified topical composition, which is a method for producing an emulsified topical composition containing diethylamino hydroxybenzoyl hexyl benzoate and (A) porous silica encapsulating an ultraviolet absorber, and comprises the following steps: Mix diethylamino hydroxybenzoyl hexyl benzoate and (A) porous silica encapsulating an ultraviolet absorber, wherein, The average particle size of the porous silica is 1.4 to 40 μm, The porous silica is a porous silica encapsulating an ultraviolet absorber that is solid at 25°C.

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