Single-phase UV-resistant cosmetic

Abstract

Provided is a single-phase UV-resistant cosmetic containing a non-aqueous volatile component, which has both excellent UV-resistant effect and excellent usability. The single-phase anti-UV cosmetic of the present disclosure contains an ultraviolet absorber, hydrophobic particles, an oil gelling agent, and a non-aqueous volatile component.

Description

Technical Field

[0001] The present disclosure relates to anti-UV cosmetics. Background Art

[0002] In recent years, various anti-UV cosmetics have been developed.

[0003] Patent Document 1 describes a sunscreen product that is substantially water-free and contains (A) a cosmetically acceptable substantially non-aqueous carrier and (B) a UV-active substance. The non-aqueous carrier contains an alcohol and an ester in an amount of 20 to 48% (w / w) based on the weight of the sunscreen product. The non-aqueous carrier contains an ester in an amount of 20% to 50% by weight based on the total weight of the non-aqueous carrier. The ester is selected from any one of a combination of diisopropyl adipate and phenethyl benzoate, a combination of diisopropyl adipate, isodecyl neopentanoate, and isostearyl neopentanoate, a combination of diisopropyl adipate and isodecyl neopentanoate, a combination of diisopropyl adipate, tridecyl neopentanoate, and lauryl lactate, and a combination of tridecyl neopentanoate and lauryl lactate. The alcohol is ethanol, and the sunscreen product does not substantially turn white after application to wet skin.

[0004] Patent Document 2 describes a sunscreen composition that contains a combination of one or more oil-soluble UV filters and a film-forming agent, is water-free and sprayable. The film-forming agent contains a copolymer of at least one of trimethylolpropane, adipic acid, neopentyl glycol, and hexanediol and at least one acrylate / octylacrylamide copolymer having a molecular weight of at least 50 kDa measured by dynamic light scattering.

[0005] Patent Document 3 describes a topical skin preparation that contains (A) an oil-soluble ultraviolet absorber, (B) an oil gelling agent in an amount of 0.5% by mass or more and 20% by mass or less, and (C) a non-aqueous volatile component in an amount of 50% by mass or more.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Patent No. 6068443 Gazette

[0009] Patent Document 2: Japanese Patent Application Laid-Open No. 2021-059534 Gazette

[0010] Patent Document 3: Japanese Patent Application Laid-Open No. 2021-123591 Gazette Summary of the Invention

[0011] Problems to be Solved by the Invention

[0012] In the field of anti-UV cosmetics, there is a need for cosmetics with high UV protection effects (SPF) and excellent usability.

[0013] The present inventors first studied the effects of the dosage form of cosmetics on SPF and usability (such as stickiness). As a result, the present inventors found that in the case of a two-phase separation system and an emulsion system composed of an oil phase and an aqueous phase, not only was the performance of SPF insufficient, but the usability was also unsatisfactory. On the other hand, it was found that in the case of a single phase containing a non-aqueous volatile component such as ethanol, although the performance of SPF was insufficient, the usability was satisfactory, and there was room for improvement in such a dosage form.

[0014] Therefore, the subject of the present disclosure is to provide a single-phase anti-UV cosmetic containing a non-aqueous volatile component, which has excellent UV protection effects and usability.

[0015] Means for solving the problem

[0016] <Scheme 1>

[0017] A single-phase anti-UV cosmetic, which contains an ultraviolet absorber, hydrophobic particles, an oil gelling agent, and a non-aqueous volatile component.

[0018] <Scheme 2>

[0019] For the cosmetic according to Scheme 1, the content of the above-mentioned hydrophobic particles is 0.1% by mass or more, and the content of the above-mentioned oil gelling agent is 0.1% by mass or more.

[0020] <Scheme 3>

[0021] For the cosmetic according to Scheme 1 or 2, the above-mentioned non-aqueous volatile component contains ethanol.

[0022] <Scheme 4>

[0023] For the cosmetic according to Scheme 3, the content of the above-mentioned ethanol is 30% by mass or more and less than 50% by mass.

[0024] <Scheme 5>

[0025] For the cosmetic according to any one of Schemes 1 to 4, the above-mentioned non-aqueous volatile component contains ethanol and volatile polydimethylsiloxane.

[0026] <Scheme 6>

[0027] For the cosmetic according to any one of Schemes 1 to 5, it further contains a non-volatile oil component.

[0028] <Scheme 7>

[0029] The cosmetic according to any one of Aspects 1 to 6, wherein the average particle diameter of the hydrophobic particles is 5 to 30 nm.

[0030] <Aspect 8>

[0031] The cosmetic according to any one of Aspects 1 to 7, wherein the hydrophobic particles are dimethylsilylated silica.

[0032] <Aspect 9>

[0033] The cosmetic according to any one of Aspects 1 to 8, having an SPF value of 30 or more and a viscosity of 100 mPa·s or less.

[0034] <Aspect 10>

[0035] The cosmetic according to any one of Aspects 1 to 9 is used by spraying with a sprayer.

[0036] Effects of the Invention

[0037] According to the present disclosure, it is possible to provide a single-phase UV protection cosmetic containing a non-aqueous volatile component, which has excellent ultraviolet ray protection effect and usability. Detailed Description of Embodiments

[0038] Hereinafter, embodiments of the present disclosure will be described in detail. The present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the gist of the invention.

[0039] The single-phase UV protection cosmetic of the present disclosure contains an ultraviolet absorber, hydrophobic particles, an oil gelling agent, and a non-aqueous volatile component.

[0040] Although not limited by theory, it is considered that the action principle of the single-phase UV protection cosmetic containing a non-aqueous volatile component of the present disclosure, which has excellent ultraviolet ray protection effect and usability, is as follows.

[0041] Typically, since UV protection cosmetics are often used in the hot season of summer, there is a tendency to expect a refreshing feeling without stickiness. In general, cosmetics such as two-phase separation systems composed of an emulsion system, an oil phase, and a water phase are not easily obtained a refreshing feeling because the water content is large and the drying after application to the skin is slow. On the other hand, a single-phase cosmetic containing a non-aqueous volatile component typically contains a large amount of non-aqueous volatile components such as ethanol that are easily volatilized because the water content is less than that of the above-mentioned dosage forms, and thus it is considered that a good feeling of use is easily obtained.

[0042] On the other hand, it is difficult for a single-phase cosmetic containing a non-aqueous volatile component to obtain a sufficient UV protection effect. Non-aqueous volatile components in cosmetics, such as ethanol, are believed to be easily compatible with the UV absorber mixed in the cosmetic due to their hydrophobic and hydrophilic properties. Therefore, when such a cosmetic is applied to the skin, for example, although it is expected that the UV absorber will be evenly spread on the skin and the UV protection effect will be improved, contrary to expectations, a sufficient UV protection effect cannot be obtained.

[0043] The present inventors have conducted various studies on the components to be mixed with cosmetics, and as a result, found that, in the case of a single-phase cosmetic containing a non-aqueous volatile component, when hydrophobic particles and an oil gelling agent are selected from various components that can be mixed with cosmetics and mixed with them in the cosmetic, the ultraviolet protection effect is improved. It should be noted that, in a single-phase cosmetic containing a non-aqueous volatile component, the effect of improving the ultraviolet protection performance cannot be obtained by mixing either hydrophobic particles or an oil gelling agent.

[0044] When a single-phase cosmetic containing a non-aqueous volatile component is applied to the skin, the non-aqueous volatile component volatilizes, so that non-volatile components such as ultraviolet absorbers remain on the surface of the skin in the form of a film. It is further believed that in the case of a single-phase cosmetic containing a non-aqueous volatile component, the ultraviolet absorber contained in the non-volatile component after the non-aqueous volatile component has volatilized is arranged on the surface of the skin in a well-balanced and uniformly dispersed state due to the influence of the hydrophobic particles and the oil gelling agent, resulting in an improved ultraviolet protection effect. It is believed that in a single-phase cosmetic containing a non-aqueous volatile component, although a large amount of non-aqueous volatile components typically volatilize, the combined use of hydrophobic particles and the oil gelling agent can give uniform dispersibility to the ultraviolet absorber in the remaining film in such a state that is easy to volatilize, and exert its effect.

[0045] Definitions of terms in this disclosure are as follows.

[0046] In the present disclosure, the so-called "single phase" refers to a single phase consisting essentially of non-aqueous volatile components, or non-aqueous volatile components and oil components compatible with the components, in which the continuous phase does not substantially contain emulsified particles of oil droplets. Therefore, the so-called "single phase" in the present disclosure may be a phase of any insoluble solid such as hydrophobic particles. However, within the scope that does not affect the effect of the present disclosure, it is allowed that the cosmetic contains, for example, a certain amount of water or emulsified particles, a certain amount of oil components incompatible with the non-aqueous volatile components (for example, oil components in a state of being solubilized (solubilized) by solvents such as alcohol).

[0047] In the present disclosure, the so-called "UV protection cosmetic", which can also be referred to as a sunscreen cosmetic, refers to a cosmetic used to protect the skin, hair, etc. from the ultraviolet rays (UV) contained in sunlight, fluorescent lamps, etc. Here, the so-called "ultraviolet rays" in the present disclosure refer to ultraviolet rays in region A (UVA), ultraviolet rays in region B (UVB), or ultraviolet rays in both region A and region B.

[0048] 《Single-phase UV protection cosmetic》

[0049] The single-phase UV protection cosmetic of the present disclosure (sometimes simply referred to as "cosmetic") contains an ultraviolet absorber, hydrophobic particles, an oil gelling agent, and a non-aqueous volatile component.

[0050] 〈Ultraviolet absorber〉

[0051] The ultraviolet absorber may be appropriately blended in such a manner as to obtain the desired ultraviolet protection performance, and there is no particular limitation on its blending amount. For example, as the blending amount of the ultraviolet absorber, it may be 1.0% by mass or more, 3.0% by mass or more, 5.0% by mass or more, 7.0% by mass or more, or 10% by mass or more with respect to the total amount of the cosmetic. There is no particular limitation on the upper limit value of the blending amount of the ultraviolet absorber. For example, it may be 30% by mass or less, 25% by mass or less, 20% by mass or less, 15% by mass or less, 10% by mass or less, or 8.0% by mass or less.

[0052] There is no particular limitation on the ultraviolet absorber, and for example, an oil-soluble ultraviolet absorber can be used. Since the oil-soluble ultraviolet absorber is hydrophobic, it is easily adsorbed to the hydrophobic particles described later. As a result, after the non-aqueous volatile component volatilizes, it is easily dispersed uniformly with the hydrophobic particles in the film composed of the oil gelling agent, etc. remaining on the surface of the skin, etc., so that the performance such as the ultraviolet protection effect can be further improved. The ultraviolet absorber can be used alone or in combination of two or more.

[0053] (Oil-soluble ultraviolet absorber)

[0054] There is no particular limitation on the oil-soluble ultraviolet absorber, and for example, an oil-soluble or oil-dispersible oil-soluble ultraviolet absorber can be used. Examples of such an ultraviolet absorber include benzoic acid-based ultraviolet absorbers such as p-aminobenzoic acid (PABA), PABA monoglyceride, N,N-dipropoxyethyl p-aminobenzoate, N,N-diethoxyethyl p-aminobenzoate, N,N-dimethyl ethyl p-aminobenzoate, N,N-dimethyl butyl p-aminobenzoate, diethylamino hydroxybenzoyl benzoic acid hexyl ester, etc.; high octyl-N-acetylanthranilate and other anthranilic acid-based ultraviolet absorbers; amyl salicylate, salicylic acid ester, homosalate (salicylic acid high Salicylic acid-based UV absorbers such as octyl salicylate (ethylhexyl salicylate), phenyl salicylate, benzyl salicylate, and p-isopropoxyphenyl salicylate; Cinnamic acid-based UV absorbers such as octyl cinnamate, ethyl-4-isopropylcinnamate, methyl-2,5-diisopropylcinnamate, ethyl-2,4-diisopropylcinnamate, methyl-2,4-diisopropylcinnamate, propyl-p-methoxycinnamate, isopropyl-p-methoxycinnamate, isoamyl-p-methoxycinnamate, octyl-p-methoxycinnamate, ethylhexyl methoxycinnamate (2-ethylhexyl-p-methoxycinnamate), 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl-di-p-methoxycinnamate, 3,4,5-trimethoxycinnamic acid 3-methyl-4-[methylbis(trimethylsilyloxy)silyl]butyl ester; 2-phenyl-5-methylbenzo azole, 2,2'-hydroxy-5-methylphenylbenzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, dibenzalazine, dianisoylmethane, tert-butylmethoxydibenzoylmethane (4-methoxy-4'-tert-butyldibenzoylmethane), 5-(3,3-dimethyl-2-norbornenyl)-3-pentan-2-one, bis-ethylhexyloxyphenol methoxyphenyltriazine, ethylhexyl triazone, octocrylene, polyorganosiloxane-15, oxybenzone-3, methylene bis-benzotriazolyl tetramethylbutylphenol, etc. Among them, from the viewpoints of UV protection effect and usability in a single-phase system dosage form containing a non-aqueous volatile component, tert-butylmethoxydibenzoylmethane, homosalate, ethylhexyl salicylate, and octocrylene are preferred. The oil-based UV absorber can be used alone or in combination of two or more.

[0055] 〈Hydrophobic particles〉

[0056] The hydrophobic particles can improve the UV protection performance of the cosmetic of the present disclosure through a synergistic effect with the oil gelling agent described later. In addition, since such particles exhibit hydrophobicity, the hydrophobic particles applied to the skin or the like can exhibit a water-repellent effect. Therefore, the hydrophobic particles can also exhibit the property of improving the water resistance of the cosmetic applied to the skin or the like.

[0057] The blending amount of the hydrophobic particles can be appropriately selected in such a way as to obtain desired properties such as UV protection effect and usability. As such a blending amount, for example, relative to the total amount of the cosmetic, it can be 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 1.5% by mass or more, 2.0% by mass or more, 2.5% by mass or more, or 3.0% by mass or more. As the upper limit value of the blending amount of the hydrophobic particles, there is no particular limitation. For example, it can be 10% by mass or less, 8.0% by mass or less, 7.0% by mass or less, 6.0% by mass or less, 5.0% by mass or less, or 4.0% by mass or less. In a single-phase dosage form containing a non-aqueous volatile component, if the hydrophobic particles are used together with the oil gelling agent described later, the UV protection effect can be significantly improved. Such a property can also be referred to as "enhancement" or "enhancement effect". From the viewpoint of enhancement, the blending amount of the hydrophobic particles is preferably 1.0% by mass or more, 1.5% by mass or more, 2.0% by mass or more, more than 2.0% by mass, 2.1% by mass or more, 2.3% by mass or more, or 2.5% by mass or more.

[0058] There is no particular limitation on the hydrophobic particles. For example, they can be particles that are hydrophobic by themselves, or particles that have been hydrophobized. As the particles constituting the hydrophobic particles, either inorganic particles or organic particles can be used. Here, in the "inorganic particles" in the present disclosure, in addition to particles formed of materials such as carbon, inorganic oxides, and inorganic nitrides, which are called inorganic substances or inorganic compounds, it also includes, for example, particles called metal particles, metal alloy particles, and metal compound particles. The hydrophobic particles can be used alone or in combination of two or more.

[0059] (Inorganic particles)

[0060] There is no particular limitation on the material of the inorganic particles constituting the hydrophobic particles. Examples thereof include metals such as silver, copper, and aluminum, inorganic oxides such as silica (e.g., pyrogenic silica, silicic acid, or anhydrous silica), zinc oxide, titanium dioxide, alumina, zirconia, and cerium oxide, carbon, mica, clay, chalk, talc, calcite (e.g., CaCO3), barium sulfate, zinc sulfide, aluminum silicate dioxide, and calcium silicate. Among them, from the viewpoints of UV protection effect, enhancement effect, and usability accompanying the use with the oil gelling agent, inorganic oxides are preferred, and silica is more preferred. In addition, silica, especially pyrogenic silica, can also play a role in making the film composed of the oil gelling agent and the like remaining on the surface of the skin and the like after the non-aqueous volatile component volatilizes uniform.

[0061] (Organic particles)

[0062] As the material of the organic particles constituting the hydrophobic particles, there is no particular limitation, and examples thereof include acrylic acid, methacrylic acid, polyolefins (e.g., polyethylene), styrene, polyamides, silicones, polyurethanes, cellulose, polylactic acid, polycaprolactone, and polyhydroxybutyric acid.

[0063] The hydrophobic particles may be particles that have been hydrophobized. As the hydrophobization treatment, there is no particular limitation, and any treatment that can modify the surface of such particles with an organic compound to make them hydrophobic can be cited. For example, organosilicon-based treatments or silane-based treatments using methylhydrogenpolysiloxane, dimethylpolysiloxane (polydimethylsiloxane), alkylsilanes, etc.; fluorine-based treatments using perfluoroalkyl phosphates, perfluoroalcohols, etc.; titanate-based treatments using alkyl titanates, etc.; amino acid treatments using N-acylglutamic acid, etc. In addition, lecithin treatment; metal soap treatment; fatty acid treatment; alkyl phosphate treatment can be cited. The hydrophobization treatment can be used alone or in combination of multiple ones. The hydrophobization treatment can be carried out using a hydrophobizing agent.

[0064] As the organosilicon of the hydrophobizing agent, examples include known organosilicons having a hydrogen-silicon bond such as methylhydrogenpolysiloxane (polydimethylsiloxane / polymethylsiloxane) copolymer. In addition, those having an alkoxy-silicon bond as a reactive group such as triethoxysilylethyl polydimethylsilyloxyethyl polydimethylsiloxane, triethoxysilylethyl polydimethylsilyloxyethyl hexyl polydimethylsiloxane can also be cited. In addition, dimethylpolysiloxane, etc. can also be used.

[0065] (Silane-based treating agent)

[0066] As the silane-based treating agent, examples include silylating agents into which an organic group has been introduced, silane coupling agents, and examples thereof include triethoxyoctylsilane.

[0067] (Titanate-based treating agent)

[0068] As the titanate-based treating agent, examples include titanate coupling agents such as alkyl titanates, pyrophosphate-type titanates, phosphite-type titanates, amino acid-type titanates, etc.

[0069] The average particle diameter of the hydrophobic particles can be appropriately selected in such a way as to obtain the ultraviolet ray defense effect, enhancement effect, and desired effects related to usability when used in combination with the oil gelling agent. The average particle diameter of the hydrophobic particles can be defined by the average particle diameter calculated by the static light scattering method. As such an average particle diameter, for example, it can be 5 nm or more, 10 nm or more, 20 nm or more, 30 nm or more, 40 nm or more, 50 nm or more, 60 nm or more, or 70 nm or more. There is no particular limitation on the upper limit value of the average particle diameter. For example, it can be 1 μm (1,000 nm) or less, 800 nm or less, 700 nm or less, 500 nm or less, 300 nm or less, 100 nm or less, 50 nm or less, 30 nm or less, or 20 nm or less. For example, the use of hydrophobic particles having an average particle diameter of 5 to 30 nm can not only suppress the clogging of the spray nozzle in a spray-type cosmetic container, but also apply uniform and dense hydrophobic particles to the skin, etc., so that the water resistance of the applied cosmetic can be further improved. In other words, this performance can also be said to be able to further reduce or suppress the water absorption of the cosmetic applied to the skin, etc., or the reduction in the ultraviolet ray defense effect (SPF) when sweating after applying the cosmetic. In addition, the present inventors have also found that by blending dimethylsilylated silica (especially dimethylsilylated pyrogenic silica) having a specified particle diameter into the cosmetic, a uniform coating film can be formed on the skin, thereby improving the ultraviolet ray defense ability and further achieving excellent usability.

[0070] 〈Oil gelling agent〉

[0071] The oil gelling agent can improve the ultraviolet ray defense performance of the cosmetic of the present disclosure through the synergistic effect with the above-mentioned hydrophobic particles. After the non-aqueous volatile components in the cosmetic evaporate, a film composed of the remaining oil gelling agent, etc. can be formed on the surface of the skin, etc., and the oil gelling agent can exhibit the property of uniformly dispersing the ultraviolet ray absorber and the hydrophobic particles in the film.

[0072] The blending amount of the oil gelling agent can be appropriately selected in such a way as to obtain performance such as the desired ultraviolet ray defense effect and usability. As such a blending amount, for example, relative to the total amount of the cosmetic, it can be 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.7% by mass or more, or 1.0% by mass or more. There is no particular limitation on the upper limit value of the blending amount of the oil gelling agent. For example, it can be 5.0% by mass or less, 4.0% by mass or less, 3.0% by mass or less, 2.0% by mass or less, or 1.5% by mass or less.

[0073] As the oil gelling agent, there is no particular limitation, and for example, dextrin fatty acid ester, sucrose fatty acid ester, glycerol fatty acid ester, amino acid-based gelling agent, fatty acid or its salt, or organically modified clay mineral can be used. Among them, from the viewpoints of ultraviolet ray protection effect accompanying the use with hydrophobic particles, usability, etc., an amino acid-based gelling agent and / or a fatty acid or its salt are preferred. The oil gelling agent can be used alone or in combination of two or more kinds.

[0074] (Dextrin fatty acid ester)

[0075] Dextrin fatty acid ester is an ester of dextrin or reducing dextrin and a higher fatty acid. As the dextrin or reducing dextrin, a substance having an average sugar polymerization degree of 3 to 100 can be used. As the fatty acid constituting the dextrin fatty acid ester, a saturated fatty acid having 8 to 22 carbon atoms can be used. Specific examples of such fatty acids include dextrin palmitate, dextrin oleate, dextrin stearate, dextrin myristate, and dextrin (palmitic acid / 2-ethylhexanoic acid) ester.

[0076] (Sucrose fatty acid ester)

[0077] For the sucrose fatty acid ester, a substance having 12 to 22 carbon atoms in which the fatty acid is linear or branched and saturated or unsaturated can be used. Specific examples of the sucrose fatty acid ester include, for example, sucrose octanoate, sucrose decanoate, sucrose laurate, sucrose myristate, sucrose palmitate, sucrose stearate, sucrose oleate, and sucrose erucate.

[0078] (Glycerol fatty acid ester)

[0079] Glycerol fatty acid ester is an esterification reaction product obtained by reacting glycerol, a dibasic acid having 18 to 28 carbon atoms, and a fatty acid having 8 to 28 carbon atoms (excluding the dibasic acid). Specific examples of the glycerol fatty acid ester include, for example, ( oleic acid / isostearic acid / eicosanedioic acid) glyceride, ( oleic acid / eicosanedioic acid) glyceride, and ( oleic acid / eicosanedioic acid) polyglycerol ester-10.

[0080] (Amino acid-based gelling agent)

[0081] Examples of the amino acid-based gelling agent include, for example, dibutyl lauroyl glutamine, dibutyl ethylhexanoyl glutamine, polyamide-8, and polyamide-3. Among them, from the viewpoints of ultraviolet ray protection effect accompanying the use with hydrophobic particles and usability, etc., polyamide-8 is preferred.

[0082] (Fatty acid or its salt)

[0083] Fatty acids can use substances that are solid at normal temperature. Examples include myristic acid, palmitic acid, stearic acid, behenic acid, and 12-hydroxystearic acid. As salts of fatty acids, examples include calcium salts, magnesium salts, and aluminum salts. Among them, from the viewpoints of the ultraviolet ray defense effect and usability accompanying the use with hydrophobic particles, palmitic acid, 12-hydroxystearic acid, or their salts are preferred. Here, in the present disclosure, "normal temperature" means a temperature range of 15°C to 25°C. As the salts of fatty acids, examples include calcium salts, magnesium salts, and aluminum salts. Among them, from the viewpoints of the ultraviolet ray defense effect and usability accompanying the use with hydrophobic particles, palmitic acid, 12-hydroxystearic acid, or their salts are preferred. Here, in the present disclosure, "normal temperature" means a temperature range of 15°C to 25°C.

[0084] (Organically modified clay mineral)

[0085] As the organically modified clay mineral, examples include water-swellable clay minerals treated with quaternary ammonium salts. Specific examples of the organically modified clay mineral include lithium montmorillonite dimethyldistearylammonium, lithium montmorillonite dimethylalkylammonium, lithium montmorillonite benzyl dimethylstearylammonium, and magnesium aluminum silicate treated with dimethyldistearylammonium chloride.

[0086] 〈Non-aqueous volatile component〉

[0087] The cosmetic of the present disclosure contains a non-aqueous volatile component. Since such a cosmetic is a single-phase dosage form containing a non-aqueous volatile component, excellent usability can be exhibited. Here, "volatile" means that the volatile component exceeds 5% when left at 105°C for 3 hours under atmospheric pressure. As the volatile component serving as an index of volatility, it can be 10% or more, 20% or more, 40% or more, 50% or more, 60% or more, 80% or more, or 100%. On the other hand, "non-volatile" means that the volatile component is 5% or less when left at 105°C for 3 hours. The non-aqueous volatile component can be used alone or in combination of two or more.

[0088] The non-aqueous volatile component can be appropriately blended in a manner to obtain the desired ultraviolet ray defense performance and usability, and there is no particular limitation on its blending amount. As the blending amount of the non-aqueous volatile component, for example, it can be 30% by mass or more, 32% by mass or more, or 35% by mass or more relative to the total amount of the cosmetic. There is no particular limitation on the upper limit value of the blending amount of the non-aqueous volatile component. For example, it can be less than 50% by mass, 49% by mass or less, 47% by mass or less, or 45% by mass or less. If the blending amount of the non-aqueous volatile component, especially ethanol, is in such a range, caking accompanying the sedimentation of hydrophobic particles can be reduced or suppressed.

[0089] In addition, if a volatile or non-volatile silicone oil described below is used in combination with a lower alcohol, particularly a volatile or non-volatile polydimethylsiloxane and ethanol, caking accompanied by the sedimentation of hydrophobic particles can be further reduced or suppressed. When a volatile or non-volatile silicone oil and a lower alcohol are used in combination to reduce caking, the blending amount of the lower alcohol may be the above-mentioned blending amount. Regarding the blending amount of the volatile or non-volatile silicone oil, based on the total amount of the cosmetic, it is preferably 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 1.5% by mass or more, or 2.0% by mass or more, and preferably 10% by mass or less, 7.0% by mass or less, 5.0% by mass or less, or 4.0% by mass or less. By blending a small amount of a volatile or non-volatile silicone oil (such as a volatile or non-volatile polydimethylsiloxane) with a lower alcohol such as ethanol, the hydrophobic property in the non-aqueous volatile component can be improved. As a result, the hydrophobic particles can be stably dispersed in the cosmetic.

[0090] The non-aqueous volatile component is not particularly limited, and examples thereof include volatile silicone oils, lower alcohols, and other volatile oils other than volatile silicone oils. Among them, from the viewpoint of usability, a volatile silicone oil (such as a volatile polydimethylsiloxane) and / or a lower alcohol (such as ethanol) is preferred. In addition, as described above, among the non-aqueous volatile components, a lower alcohol, particularly ethanol, tends to cause the sedimentation of hydrophobic particles. However, the present inventors have also found that if a volatile or non-volatile silicone oil is used in combination with a lower alcohol, particularly a volatile or non-volatile polydimethylsiloxane and ethanol, the sedimentation of hydrophobic particles in the cosmetic can be suitably reduced or suppressed, that is, the dispersion stability of the hydrophobic particles in the cosmetic can be improved.

[0091] (Volatile silicone oil)

[0092] Examples of the volatile silicone oil include volatile non-cyclic silicone oils and volatile cyclic silicone oils. Among them, volatile non-cyclic silicone oils are preferred.

[0093] Examples of the volatile non-cyclic silicone oil that can be used include volatile linear silicone oils and volatile branched silicone oils. Among them, volatile linear silicone oils are preferred.

[0094] Examples of the volatile linear silicone oils include, for example, decamethyltetrasiloxane, octamethyltrisiloxane, ethyltrisiloxane, octylpolymethylsiloxane, and volatile polydimethylsiloxane (sometimes referred to as volatile dimethylpolysiloxane). Among them, volatile polydimethylsiloxane is preferred. Examples of such polydimethylsiloxanes include low molecular weight linear polydimethylsiloxanes such as polydimethylsiloxane with a viscosity of 0.65 cSt, polydimethylsiloxane with a viscosity of 1 cSt, polydimethylsiloxane with a viscosity of 1.5 cSt, and polydimethylsiloxane with a viscosity of 2 cSt. Here, these viscosities refer to the kinematic viscosities in an atmosphere of 25°C.

[0095] Examples of the volatile branched silicone oils include, for example, methylpolymethyltrisiloxane, tris(trimethylsilyl)methylsilane, tetra(trimethylsilyl)silane, and other low molecular weight branched siloxanes.

[0096] Examples of the volatile cyclic silicone oils include, for example, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

[0097] (Lower alcohols)

[0098] Examples of the lower alcohols include, for example, linear or branched monohydric alcohols having 1 to 6 carbon atoms, preferably linear or branched saturated monohydric alcohols having 1 to 6 carbon atoms. Here, the number of carbon atoms of the lower alcohol is preferably 1 to 4, more preferably 2 to 3.

[0099] Specific examples of the lower alcohols include ethanol, n-propanol, isopropanol, and butanol. Among them, from the viewpoints of usability and the like, ethanol and isopropanol are preferred, and ethanol is more preferred.

[0100] (Other volatile oils)

[0101] The volatile oils other than the volatile silicone oils are not particularly limited, and examples include, for example, volatile hydrocarbon oils. Examples of the volatile hydrocarbon oils include, for example, linear or branched hydrocarbons having 8 to 16 carbon atoms. Specific examples of the volatile hydrocarbon oils include octane, isooctane, nonane, isononane, decane, isodecane, undecane, isoundecane, dodecane, isododecane, tridecane, isotridecane, tetradecane, isotetradecane, pentadecane, isopentadecane, hexadecane, and isohexadecane. In addition, isoparaffin-based volatile hydrocarbon oils such as light isoparaffin can also be used.

[0102] 〈Optional component〉

[0103] In the single-phase UV-protective cosmetic of the present disclosure, various components can be appropriately blended within a range that does not affect the effects of the present disclosure. Examples of such components include a dispersant, a surfactant (anionic surfactant, cationic surfactant, amphoteric surfactant, nonionic surfactant), a humectant, an aqueous or oily polymer, a sequestering agent, a polyol, a higher alcohol, various extracts, an amino acid, an organic amine, a neutralizing agent, a chelating agent, an ultraviolet scattering agent, a skin nutrient, a vitamin, a medicament applicable to quasi-drugs or cosmetics, a preservative, a propellant, a pigment, a dye, a colorant, a fragrance, water, and other oils other than the above-mentioned volatile oil components (e.g., non-volatile oil components). The optional components can be used alone or in combination of two or more.

[0104] (Water)

[0105] The cosmetic of the present disclosure can contain water (e.g., ion-exchanged water, distilled water, ultrapure water, tap water), but if a large amount of water is contained, the usability and other properties may sometimes deteriorate. Therefore, from the viewpoint of usability and the like, as the blending amount of water, relative to the total amount of the cosmetic, it is preferably 10% by mass or less, 7.0% by mass or less, 5.0% by mass or less, 3.0% by mass or less, 1.0% by mass or less, 0.5% by mass or less, or 0.1% by mass or less, and it is more preferable that water is substantially not contained in the cosmetic. Here, the term "substantially" means that a trace amount of water adsorbed or the like is allowed to be present in the components blended in the cosmetic.

[0106] (Dispersant)

[0107] In some embodiments, the single-phase UV-protective cosmetic of the present disclosure contains a dispersant. By blending the dispersant in the cosmetic, the dispersibility of the hydrophobic particles is further improved, so that the hydrophobic particles can be more uniformly dispersed in the remaining film after the cosmetic is applied to the skin or the like. As a result, for example, the ultraviolet absorber adsorbed on the hydrophobic particles can also be uniformly dispersed, so that the ultraviolet protection performance can be further improved, or the water resistance of the film can be further improved by the hydrophobic particles uniformly dispersed in the film.

[0108] There is no particular limitation on the blending amount of the dispersant. For example, relative to the total amount of the cosmetic, it can be 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.2% by mass or more, or 0.3% by mass or more. There is no particular limitation on the upper limit value of the blending amount of the dispersant. For example, it can be 5.0% by mass or less, 3.0% by mass or less, or 1.0% by mass or less.

[0109] As the dispersant, there is no particular limitation, and examples thereof include liquid higher fatty acids, sorbitan fatty acid esters, polyglycerol fatty acid esters, polyglycerol-modified silicone, and polyhydroxystearic acid. Among them, from the viewpoints of ultraviolet ray shielding performance, water resistance, usability, etc., polyglycerol fatty acid esters, polyglycerol-modified silicone, and polyhydroxystearic acid are preferred, and polyhydroxystearic acid is more preferred. The dispersant can be used alone or in combination of two or more.

[0110] As the liquid higher fatty acid, a substance that is liquid at normal temperature can be used, and examples thereof include isostearic acid, oleic acid, linoleic acid, and linolenic acid.

[0111] Examples of the sorbitan fatty acid esters include sorbitan sesquiisostearate, sorbitan isostearate, sorbitan sesquioleate, and sorbitan trioleate.

[0112] Examples of the polyglycerol fatty acid esters include polyglyceryl-2 stearate, polyglyceryl-2 oleate, polyglyceryl-2 dioleate, polyglyceryl-2 isostearate, polyglyceryl-2 diisostearate, polyglyceryl-2 triisostearate, polyglyceryl-4 stearate, polyglyceryl-4 oleate, polyglyceryl-4 tristearate, polyglyceryl-4 pentaoleate, polyglyceryl-6 laurate, polyglyceryl-6 myristate, polyglyceryl-6 stearate, polyglyceryl-6 oleate, polyglyceryl-6 tristearate, polyglyceryl-6 tetrastearate, polyglyceryl-6 pentastearate, polyglyceryl-6 pentaoleate, polyglyceryl-6 polyricinoleate, polyglyceryl-10 laurate, polyglyceryl-10 myristate, polyglyceryl-10 stearate, polyglyceryl-10 isostearate, polyglyceryl-10 oleate, polyglyceryl-10 linoleate, polyglyceryl-10 distearate, polyglyceryl-10 diisostearate, polyglyceryl-10 tristearate, polyglyceryl-10 trioleate, polyglyceryl-10 pentastearate, polyglyceryl-10 pentahydroxystearate, polyglyceryl-10 pentaisostearate, polyglyceryl-10 pentaoleate, polyglyceryl-10 heptastearate, polyglyceryl-10 heptaoleate, polyglyceryl-10 decastearate, polyglyceryl-10 diisodecastarate, polyglyceryl-10 decaoleate, polyglyceryl-10 decamacadamiate, and polyglyceryl-10 polyricinoleate. Among them, from the viewpoints of ultraviolet ray shielding performance, water resistance, usability, etc., polyglyceryl-6 polyricinoleate is preferred.

[0113] Examples of the polyglycerol-modified silicone include a linear polyglycerol-modified silicone represented by the following formula A (also sometimes referred to as "organosilylated polyglycerol at both ends").

[0114]

[0115] ​In Formula A, R1 represents a linear or branched alkyl group having 1 to 12 carbon atoms or a phenyl group, R2 represents an alkylene group having 2 to 11 carbon atoms, p is 10 to 120, and q is 1 to 11. Specific examples of the polyglycerol-modified silicone include dibutyl polydimethylsiloxane polyglyceryl-3 and the like. Among them, from the viewpoints of ultraviolet ray protection performance, water resistance, usability, etc., dibutyl polydimethylsiloxane polyglyceryl-3 is preferred.

[0116] Polyhydroxystearic acid is a polymer of hydroxystearic acid having one hydroxyl group. The degree of polymerization of hydroxystearic acid is preferably 3 to 12, and more preferably 4 to 8.

[0117] (Non-volatile oil component)

[0118] In some embodiments, the single-phase UV-protective cosmetic of the present disclosure contains a non-volatile oil component. If a non-volatile oil component is included in the cosmetic, thickening or gelation occurs in the remaining film after applying the cosmetic to the skin or the like through the above oil gelling agent. Therefore, components such as hydrophobic particles and ultraviolet absorbers can be immobilized in the film, and properties such as ultraviolet ray protection performance and water resistance can be further improved. The non-volatile oil component can be used alone or in combination of two or more.

[0119] The blending amount of the non-volatile oil component is not particularly limited. For example, it can be 1.0% by mass or more, 5.0% by mass or more, 10% by mass or more, 15% by mass or more, or 20% by mass or more with respect to the total amount of the cosmetic. In addition, it can be 45% by mass or less, 40% by mass or less, 35% by mass or less, or 30% by mass or less.

[0120] The type of the non-volatile oil component is not particularly limited, and examples thereof include hydrocarbon oils, ester oils, silicone oils, and fats and oils.

[0121] Examples of the non-volatile hydrocarbon oil include liquid paraffin, hydrogenated polyisobutene, squalane, squalene, paraffin, isoparaffin, ceresine, isododecane, isocetane, ozokerite, pristane, and petrolatum.

[0122] Examples of the non-volatile ester oil include triglyceride (caprylic / capric acid), pentaerythritol tetraethylhexanoate, cetyl ethylhexanoate, jojoba oil, di(phytosteryl / octyldodecyl) lauroyl glutamate, triglyceride triisostearate, diglyceride diisostearate, triglyceride (ethylhexanoic acid), dimer dilinoleic acid (phytosteryl / mountain base) ester, dimer dilinoleic acid (phytosteryl / isostearyl / cetyl / stearyl / isostearyl / cetyl / stearyl / mountain (Acid / benzoic acid / ethylhexanoic acid)pentaerythritol ester, ethylhexyl palmitate, myristyl myristate, isopropyl myristate, dipropylene glycol dipivalate (dipivalic acid PPG-3), diisopropyl sebacate, isodecyl neopentanoate, octyl octanoate, nonyl nonanoate, cetyl octanoate, octyldodecyl myristate, butyl stearate, hexyl laurate, decyl oleate, hexyl decyl dimethyl octanoate, cetyl lactate, myristyl lactate, isocetyl stearate, isoisocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl diol monoisostearate, neopentyl glycol didecanoate, tripropylene glycol neopentanoate, diisostearyl malate, glyceryl di-2-heptylundecanoate, glyceryl diisostearate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, glyceryl trioctanoate, glyceryl tripalmitate, cetyl 2-ethylhexanoate-2-ethylhexyl palmitate, glyceryl trimyristate, glyceryl tri-2-heptylundecanoate, methyl ricinoleate, oleyl oleate, acetyl glyceride, 2-heptylundecyl palmitate, diisobutyl adipate, 2-octyldodecyl N-lauroyl-L-glutamate, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, 2-ethylhexyl succinate, triethyl citrate and C12-C15 alkyl benzoate.

[0123] As non-volatile silicone oils, for example, non-volatile polydimethylsiloxane and phenyl-modified silicone can be cited.

[0124] As non-volatile oils and fats, for example, linseed oil, camellia oil, macadamia nut oil, corn oil, olive oil, avocado oil, camellia flower oil, castor oil, safflower oil, rapeseed oil, soybean oil, peanut oil, triglyceride, sesame oil, peach kernel oil, wheat germ oil, cottonseed oil, perilla oil, camellia seed oil, torreya nucifera oil, rice bran oil, white tung oil, Japanese tung oil, jojoba oil, germ oil, etc. can be cited. In addition, as solid oils and fats, for example, cocoa butter, coconut oil, hydrogenated coconut oil, palm oil, palm kernel oil, candlenut oil, hydrogenated oil, candelilla wax and hydrogenated castor oil can be cited.

[0125] In addition, for example, non-volatile components such as non-volatile polyols can also be treated as non-volatile oil components. Specific examples of such polyols can include ethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol (e.g., PPG-17), polyethylene glycol / polypropylene glycol, diethylene glycol monoalkyl ether, glycerin, diglycerin, triglycerin, polyglycerin.

[0126] 〈Ultraviolet protection performance (SPF)〉

[0127] The cosmetic of the present disclosure can exhibit excellent ultraviolet ray defense performance. The ultraviolet ray defense performance of the cosmetic can be appropriately adjusted according to the required performance corresponding to the use environment, etc., by the types and blending amounts of the ultraviolet absorber, hydrophobic particles, and oil gelling agent blended in the cosmetic. Specifically, the cosmetic of the present disclosure can exhibit, for example, an SPF value of 30 or more, 40 or more, 50 or more, 60 or more, 80 or more, 85 or more, 90 or more, or 100 or more. As the upper limit value of the SPF value, there is no particular limitation, and for example, it can be 200 or less, 180 or less, 160 or less, or 150 or less. Here, the SPF value can be evaluated using the apparatus and method described in the following examples. In addition, this SPF value can typically serve as an indicator of the ultraviolet ray defense effect when the cosmetic is applied to the skin or the like.

[0128] 〈Viscosity〉

[0129] There is no particular limitation on the viscosity of the cosmetic of the present disclosure, and for example, it can be appropriately set according to the dosage form. As the viscosity of the cosmetic, for example, it can be 3,000 mPa·s or less, 2,000 mPa·s or less, 1,000 mPa·s or less, 500 mPa·s or less, 300 mPa·s or less, 100 mPa·s or less, or 80 mPa·s or less. As the lower limit value of the viscosity, there is no particular limitation, and for example, it can be 1 mPa·s or more, 5 mPa·s or more, 10 mPa·s or more, 30 mPa·s or more, or 50 mPa·s or more. The viscosity can be measured using an L-type viscometer (manufactured by Shibaura Semtec Co., Ltd.) under the conditions of 30 °C, rotor No. 1, and 12 rpm.

[0130] The cosmetic of the present disclosure can be used, for example, as a mist-type cosmetic that can be sprayed with a sprayer. Since the cosmetic of the present disclosure is in the form of a single phase containing a non-aqueous volatile component, its viscosity can be low, and it can be suitably used as a liquid cosmetic, a spray cosmetic, etc. In addition, if the viscosity of the cosmetic is low, it can exhibit comfortable usability. From the viewpoints of the use of liquid or spray cosmetics, etc. and the usability of the cosmetic, the viscosity of the cosmetic is preferably 100 mPa·s or less, 80 mPa·s or less, 50 mPa·s or less, 30 mPa·s or less, or 10 mPa·s or less.

[0131] 〈Enhancement rate〉

[0132] The so-called "improvement rate" is the value obtained by subtracting 100 from the ratio (percentage) of the SPF value of a test sample prepared in the same manner using a cosmetic containing the same amount and type of ultraviolet absorber as the reference cosmetic (sometimes referred to as the "reference cosmetic") but containing no hydrophobic particles and no oil gelling agent, and a cosmetic containing the same amount and type of ultraviolet absorber as the reference cosmetic, as well as hydrophobic particles and an oil gelling agent, relative to the SPF value of the reference cosmetic. Therefore, it can be said that if the improvement rate exceeds 0%, more excellent ultraviolet protection performance is obtained compared to the reference cosmetic. In addition, it can also be said that in a cosmetic in which the improvement rate can be increased, the ultraviolet absorber is uniformly applied to the skin or hair compared to a cosmetic containing no hydrophobic particles and no oil gelling agent, showing good ultraviolet shielding performance. Therefore, the uniform application state and good ultraviolet shielding performance related to the cosmetic applied to the surface of the skin or hair can also be indirectly defined by this improvement rate.

[0133] The cosmetic of the present disclosure can achieve an improvement rate of 5% or more, 10% or more, 20% or more, 30% or more, or 40% or more. There is no particular limitation on the upper limit value of the improvement rate. For example, it can be 100% or less, 90% or less, or 80% or less. This improvement rate can be evaluated using the apparatus and method described in the following examples.

[0134] 〈Water resistance (water-resistant ultraviolet protection performance)〉

[0135] In some embodiments

[0136] the cosmetic of the present disclosure also has excellent ultraviolet protection performance after being wetted with water or sweating. Such performance can also be appropriately adjusted according to the required performance corresponding to the use environment, etc., by the types and blending amounts of the ultraviolet absorber, hydrophobic particles, dispersant, etc. blended in the cosmetic. Regarding water resistance, its performance can be defined by the water resistance evaluation described below. Specifically, the cosmetic of the present disclosure can exhibit, for example, an absorbance integration rate of 80% or more, more than 80%, 85% or more, 90% or more, 93% or more, or 95% or more. There is no particular limitation on the upper limit value of the absorbance integration rate. For example, it can be 100% or less or less than 100%.

[0137] 〈Method for manufacturing a cosmetic〉

[0138] There is no particular limitation on the method for manufacturing the cosmetic of the present disclosure. For example, the above-mentioned ultraviolet absorber, hydrophobic particles, oil gelling agent, and any components as required can be appropriately mixed and stirred in a non-aqueous volatile component to prepare the cosmetic. During the preparation of the cosmetic, heating or cooling can be performed as required.

[0139] 〈Form of the cosmetic〉

[0140] The dosage form of the cosmetic of the present disclosure is not particularly limited, and examples thereof include liquid, gel, spray, etc. Since the cosmetic of the present disclosure is in the form of a single phase containing a non-aqueous volatile component, the viscosity can be low, and thus excellent usability can be exhibited as compared with conventional cream-like UV protection cosmetics. Among these dosage forms, the cosmetic of the present disclosure can be suitably used as a liquid cosmetic and a spray cosmetic, and the use as a spray cosmetic is most suitable. Here, in the present disclosure, the so-called "liquid cosmetic" refers to, for example, a cosmetic such as a lotion taken on the hand or a cotton pad and applied to the skin. The "spray cosmetic" of the present disclosure refers to a cosmetic in which the cosmetic in the container is also a liquid, but such a cosmetic is applied to the skin in a spray manner. In addition, in the present disclosure, the so-called "spray" can include a fog-type spray, an aerosol-type spray, etc.

[0141] 《UV Protection (Sun Protection) Cosmetics》

[0142] The single-phase UV protection cosmetic of the present disclosure can be housed in various containers and provided as a UV protection cosmetic. The product form of this cosmetic is not particularly limited, and various product forms that can be used for the skin, hair, etc. can be adopted. Specifically, examples include lotion, essence, gel, spray, etc. Among them, the cosmetic of the present disclosure can have a low viscosity and is suitable for spraying from the nozzle of a sprayer. In addition, even if it is sprayed with a sprayer and applied to the skin, etc. and spread, the ultraviolet absorber, hydrophobic particles, etc. can be evenly maintained on the surface of the skin, etc. Therefore, it is advantageous to use it as a UV protection cosmetic that houses such a cosmetic in a sprayer container and can be sprayed with a sprayer.

[0143] Examples

[0144] Examples are given below to further illustrate the present disclosure in detail, but the present disclosure is not limited to these. It should be noted that hereinafter, unless otherwise specified, the blending amounts are expressed in mass%. In addition, the various evaluation methods described in the examples are not limited to the cosmetics described in the examples, and can be similarly implemented for cosmetics containing the above-mentioned respective components.

[0145] 《Examples 1 to 7 and Comparative Examples 1 to 6》

[0146] The cosmetics obtained by the formulations shown in Tables 1 to 2 and the manufacturing method shown below were evaluated as follows, and the results are shown in Tables 1 to 2.

[0147] 〈Evaluation Method〉

[0148] (Evaluation of SPF Value)

[0149] The SPF value, also known as the ultraviolet protection index, of the cosmetics obtained through the formulations and manufacturing methods shown in Tables 1 - 2 below was evaluated. Here, the SPF value was calculated as follows. In addition, in Tables 1 - 2, an SPF value of 30 or less was expressed as "C", a value exceeding 30 and less than 50 was expressed as "B", and a value of 50 or more was expressed as "A". It should be noted that the values in parentheses in the table are the SPF values.

[0150] On a measurement plate (S plate) (a 5×5 cm V - groove PMMA (polymethyl methacrylate) plate, SPFMASTER (trademark) PA01), each composition (cosmetic) was dropped in an amount of 2 mg / cm 2 , smeared with a finger for 60 seconds, and after drying for 15 minutes, the absorbance of the formed film was measured using a U - 3500 type self - recording spectrophotometer manufactured by Hitachi, Ltd. The non - smeared plate was set as a control, and the absorbance (Abs) was calculated from the following formula 1. The measured values in the range of 290 nm - 320 nm (UVB region) and 320 - 400 nm (UVA region) were accumulated, and the sum of the accumulated values in the UVB region and the UVA region was set as the absorbance cumulative value of the sample. The SPF value was calculated by converting this absorbance cumulative value through a known method. Here, T refers to the transmittance of the sample, and T0 refers to the transmittance of the non - smeared sample:

[0151] Absorbance (Abs)= - log(T / T0)…Formula 1

[0152] (Enhancement rate)

[0153] Taking the SPF value of the cosmetic in Comparative Example 1, which does not contain hydrophobic particles and oil gelling agents, as a reference value, this reference value and the SPF value of the test sample for evaluation were introduced into the following formula 2 to calculate the enhancement rate:

[0154] Enhancement rate (%)=(SPF value of the test sample for evaluation × 100 / reference value)-100…Formula 2

[0155] (Usability evaluation)

[0156] The compositions (cosmetics) of each example housed in a container equipped with a spray nozzle with a diameter of 0.25 - 0.4φ were spray - misted onto the skin of professional reviewers with makeup, and the usability (stickiness) after application was evaluated sensorially according to the following evaluation criteria:

[0157] A: No stickiness at all.

[0158] B: Slightly sticky.

[0159] C: Slightly sticky but no problem.

[0160] D: Sticky.

[0161] (Water resistance evaluation: integrated absorbance ratio after water resistance test)

[0162] On a measurement plate (S plate) (a 5×5 cm V-groove PMMA plate, SPF MASTER (trademark) PA01, manufactured by Shiseido Co., Ltd.), the prepared cosmetic was dropped in an amount of 2 mg / cm 2 , spread with a finger for 60 seconds, and after drying for 15 minutes, its absorbance in the wavelength range of 280 to 400 nm was measured using a U-3500 type self-recording spectrophotometer manufactured by Hitachi, Ltd. Glycerol without ultraviolet absorption was used as a control, and the absorbance was calculated by the following formula 3. Here, T in formula 2 refers to the transmittance of the sample, and T0 refers to the transmittance of glycerol:

[0163] Absorbance = -log(T / T0) … Formula 3

[0164] The measured plate was fully immersed in water with a hardness of 50 to 500, and directly stirred in water at 300 rpm for 30 minutes using a Three One Motor. Then, it was dried for about 15 to 30 minutes until the water droplets on the surface disappeared, and the absorbance was measured again. The integrated absorbance ratio (sometimes also called the “absorbance change rate”) was calculated from the cumulative value (total value) of the absorbance before and after the water bath by the following formula 4. Here, if the integrated absorbance ratio is 80% or more, it exhibits performance equal to or better than that before the water resistance test even after the water resistance test, so it can be said that the water resistance (that is, the effect of being able to suppress the reduction of ultraviolet ray defense performance when wetted) is excellent. In Table 1, an integrated absorbance ratio less than 80% is marked as “C”, 80% or more and less than 100% is marked as “B”, and 100% is marked as “A”. It should be noted that the values in parentheses in the table are the values of the integrated absorbance ratio (%):

[0165] Integrated absorbance ratio (%) = cumulative value of absorbance after water bath × 100 / cumulative value of absorbance before water bath … Formula 4

[0166] 〈Manufacturing method of cosmetic〉

[0167] (Comparative Example 1: Single-phase cosmetic containing non-aqueous volatile components)

[0168] Various components shown in Table 1 were mixed in ethanol as a non-aqueous volatile component and uniformly mixed to obtain a single-phase cosmetic containing non-aqueous volatile components of Comparative Example 1.

[0169] (Examples 1 to 7 and Comparative Examples 2 to 3: Single-phase cosmetics containing non-aqueous volatile components)

[0170] The prescription ingredients and compounding amounts were changed to those shown in Table 1, and except for this, the operation was carried out in the same manner as in Comparative Example 1, and single-phase cosmetics containing non-aqueous volatile components of Examples 1 to 7 and Comparative Examples 2 to 3 were obtained.

[0171] (Comparative Example 4: Two-phase separation cosmetic)

[0172] Ethanol as a non-aqueous volatile component was mixed with water, and various components described in Table 2 were compounded therein, and the two-phase separation cosmetic of Comparative Example 4 was obtained by uniformly mixing.

[0173] (Comparative Example 5: Emulsion cosmetic)

[0174] Ethanol as a non-aqueous volatile component was mixed with water, and various components described in Table 2 were compounded therein, and the emulsion cosmetic of Comparative Example 5 was obtained by uniformly mixing.

[0175] (Comparative Example 6: Nanoemulsion emulsion cosmetic)

[0176] Ethanol as a non-aqueous volatile component was mixed with water, and various components described in Table 2 were compounded therein, and the nanoemulsion emulsion cosmetic of Comparative Example 6 was obtained by uniformly mixing.

[0177]

[0178] Table 2

[0179] 〈Results〉

[0180] It was clarified from the results in Table 2 that the cosmetics of Comparative Examples 4 to 6 mainly containing water all showed a sticky feeling after being applied to the skin and did not obtain good usability. In addition, from the results in Table 1, it was known that in the case of single-phase cosmetics containing non-aqueous volatile components, good results were obtained in terms of usability, but if the results of Comparative Examples 1 to 3 were observed, it was known that good UV protection performance could not be obtained when the cosmetic contained only either hydrophobic particles or an oil gelling agent. On the other hand, it was clarified from the results of Examples 1 to 7 that in the case of single-phase cosmetics containing non-aqueous volatile components, if both hydrophobic particles and an oil gelling agent were compounded in the cosmetic, good results could be confirmed not only in terms of usability but also in UV protection performance.

[0181] In addition, from the results in Table 1, it was known that if both hydrophobic particles and an oil gelling agent were contained in the cosmetic, the water resistance was also excellent.

[0182] Furthermore, from the results in Table 1, it was known that the SPF values of the cosmetics of Examples 1 to 7 were increased compared with those of the cosmetic of Comparative Example 1, and a good improvement rate could be presented.

[0183] It should be noted that the cosmetics of Examples 6 and 7 using sugar fatty acid esters such as dextrin palmitate and dextrin (palmitic acid / ethylhexanoic acid) ester as oil gelling agents tend to be inferior in terms of the dispersion stability of hydrophobic particles and the transparency of the cosmetics compared to the cosmetics of other examples.

Claims

1. A single-phase UV-protective cosmetic containing an ultraviolet absorber, hydrophobic particles, an oil gelling agent, and a non-aqueous volatile component.

2. The cosmetic according to claim 1, wherein the content of the hydrophobic particles is 0.1% by mass or more, and the content of the oil gelling agent is 0.1% by mass or more.

3. The cosmetic according to claim 1 or 2, wherein the non-aqueous volatile component contains ethanol.

4. The cosmetic according to claim 3, wherein the content of the ethanol is 30% by mass or more and less than 50% by mass.

5. The cosmetic according to claim 1 or 2, wherein the non-aqueous volatile component contains ethanol and volatile polydimethylsiloxane.

6. The cosmetic according to claim 1 or 2, which further contains a non-volatile oil component.

7. The cosmetic according to claim 1 or 2, wherein the average particle diameter of the hydrophobic particles is 5 to 30 nm.

8. The cosmetic according to claim 7, wherein the hydrophobic particles are dimethylsilylated silica.

9. The cosmetic according to claim 1 or 2, having an SPF value of 30 or more and a viscosity of 100 mPa·s or less.

10. The cosmetic according to claim 1 or 2, which is used by spraying with a sprayer.

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