Emulsified cosmetics

Abstract

To provide emulsion cosmetics with an unprecedented innovative ability where their ultraviolet protection effects increase, rather than decrease, due to heat applied in the usage environment.SOLUTION: The present invention pertains to emulsion cosmetics comprising (A) an ultraviolet protectant, (B) a polyhydric alcohol having an IOB value of 5.0 or lower, and (C) an ester oil having an IOB value of 0.3 or higher.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an emulsion cosmetic having a sunscreen effect, and more specifically to an emulsion cosmetic having the unprecedented property that, upon heating, the ultraviolet protection effect is improved compared to immediately after application. [Background technology]

[0002] Cosmetics with sunscreen effects have the effect of suppressing adverse effects on the skin by reducing the amount of ultraviolet rays that reach the skin to which the cosmetic is applied through the action of ultraviolet absorbers and ultraviolet scattering agents contained in the cosmetic.

[0003] The Sun Protection Factor (SPF) is the most widely known indicator of the UV protection effect of cosmetics, and UV protection effect is expressed as an SPF value (e.g., "SPF30"). In Japan, PFA (Protection Factor of UVA) or UVAPF (UVA Protection Factor of product) is used for UVA rays, and the degree of UVA protection effect of a product is expressed as a PA (Protection Grade of UVA) classification (e.g., "PA++") based on the PFA or UVAPF value. In the United States, the Critical Wavelength (CW) is used to indicate the balance of UVA and UVB protection effects.

[0004] In recent years, in order to suppress the adverse effects of ultraviolet rays on the skin, there has been a demand for cosmetics that provide high UV protection across a wide wavelength range from UVA to UVB. For example, sunscreen products with SPF 50 or higher (50+) and PA++++ have been launched on the market.

[0005] The UV protection effect of sunscreen products is achieved by the UV protection agents contained in them, namely UV absorbers and UV scattering agents. However, some UV absorbers lose their UV absorption ability when exposed to light (photodegradation), and UV absorbers and UV scattering agents can also be washed away from the skin surface when they come into contact with water.

[0006] Many ideas have been proposed to suppress photodegradation of UV protection effects (Patent Document 1), and in terms of water resistance, cosmetics have been developed with innovative properties that do not reduce UV protection effects even when in contact with water, but rather improve protection effects (Patent Document 2).

[0007] On the other hand, just like light and moisture, the reduction in UV protection effect due to heat cannot be ignored. Generally, when heat is applied to a cosmetic product applied to the skin, the UV absorbers and other ingredients contained in the cosmetic product deteriorate, resulting in a reduction in UV protection effect. However, with regard to heat, although there are examples that have investigated the effect of heat on the emulsion stability of emulsion cosmetics containing cosmetic products (Patent Document 3), the change in UV protection effect due to heat has not been investigated to date, and no cosmetic product has been proposed to date that aims to prevent the reduction in UV protection effect due to heat. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] International Publication No. 2017 / 057676 [Patent Document 2] International Publication No. 2016 / 068300 [Patent Document 3] Patent No. 4397286 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0009] The present invention is based on the discovery, made in the course of research into developing cosmetics with UV protection effects, of a phenomenon in which the UV protection effect is not reduced but rather improved by heat applied in the usage environment. The object of the present invention is to provide an emulsion cosmetic having unprecedented, innovative properties in which the UV protection effect is improved by heat. [Means for solving the problem]

[0010] As a result of extensive research into solving the above-mentioned problems, the present inventors discovered that an emulsion cosmetic having the above-mentioned desired novel properties can be obtained by blending an ultraviolet protection agent, a specific polyhydric alcohol, and a specific ester oil, and thus completed the present invention.

[0011] That is, the present invention is (A) an ultraviolet protection agent; (B) a polyhydric alcohol having an IOB value of 5.0 or less; (C) Ester oil with an IOB value of 0.3 or more The present invention provides an emulsified cosmetic comprising: [Effects of the Invention]

[0012] By adopting the above-described configuration, the emulsion cosmetic of the present invention does not deteriorate its UV protection effect when heat is applied during actual use, but rather significantly improves its UV protection effect compared to immediately after application of the cosmetic to the skin. In other words, the emulsion cosmetic of the present invention is an innovative cosmetic that possesses properties contrary to conventional wisdom, in that heat, which has been considered a cause of deterioration in the UV protection effect of conventional cosmetics, actually improves its UV protection effect. DETAILED DESCRIPTION OF THE INVENTION

[0013] The emulsion cosmetic of the present invention is characterized by containing (A) an ultraviolet protection agent, (B) a polyhydric alcohol having an IOB value of 5.0 or less, and (C) an ester oil having an IOB value of 0.3 or more. Each component constituting the emulsion cosmetic of the present invention will be described in detail below.

[0014] <(A) UV Protection Agent (UV Absorber and / or UV Scatterer)> The ultraviolet protection agent (A) (hereinafter sometimes simply referred to as "component (A)") incorporated into the emulsion cosmetic of the present invention refers to an ultraviolet absorber and / or an ultraviolet scattering agent, and those that are typically incorporated into cosmetics can be used.

[0015] The ultraviolet absorber that can be used in the present invention is not particularly limited, but examples thereof include benzoic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, dibenzoylmethane derivatives, β,β-diphenylacrylate derivatives, benzophenone derivatives, benzylidene camphor derivatives, phenylbenzimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, anthranil derivatives, imidazoline derivatives, benzalmalonate derivatives, 4,4-diarylbutadiene derivatives, etc. Specific examples and trade names are listed below, but the present invention is not limited to these.

[0016] Examples of benzoic acid derivatives include ethyl para-aminobenzoate (PABA), ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA (e.g., Escarol 507; ISP), glyceryl PABA, PEG-25-PABA (e.g., Uvinal P25; BASF), and diethylaminohydroxybenzoylhexyl benzoate (e.g., Uvinal A Plus).

[0017] Examples of salicylic acid derivatives include homosalate (Eusolex HMS; Rona / EM Industries), ethylhexyl salicylate or octyl salicylate (e.g., NeoHeliopan OS; Herman & Reimer), dipropylene glycol salicylate (e.g., Dipsal; Skell), and TEA salicylate (e.g., NeoHeliopan TS; Herman & Reimer).

[0018] Examples of cinnamic acid derivatives include octyl methoxycinnamate or ethylhexyl methoxycinnamate (e.g., Parsol MCX; DSM), isopropyl methoxycinnamate, isoamyl methoxycinnamate (e.g., Neo Heliopan E1000; Herman & Reimer), cinnoxate, DEA methoxycinnamate, diisopropyl methylcinnamate, glyceryl ethylhexanoate dimethoxycinnamate, and di-(2-ethylhexyl)-4'-methoxybenzalmalonate.

[0019] Examples of dibenzoylmethane derivatives include 4-tert-butyl-4'-methoxydibenzoylmethane (for example, "Parsol 1789"; DSM Co., Ltd.).

[0020] Examples of β,β-diphenylacrylate derivatives include octocrylene (for example, "Uvinal N539T"; BASF).

[0021] Examples of benzophenone derivatives include benzophenone-1 (e.g., "Uvinal 400"; BASF), benzophenone-2 (e.g., "Uvinal D50"; BASF), benzophenone-3 or oxybenzone (e.g., "Uvinal M40"; BASF), benzophenone-4 (e.g., "Uvinal MS40"; BASF), benzophenone-5, benzophenone-6 (e.g., "Helisorb 11"; Norquay), benzophenone-8 (e.g., "Spectra-Sorb UV-24"; American Cyanamid), benzophenone-9 (e.g., "Uvinal DS-49"; BASF), and benzophenone-12.

[0022] Examples of benzylidene camphor derivatives include 3-benzylidene camphor (e.g., "Mexoryl SD"; Cimex), 4-methylbenzylidene camphor, benzylidene camphorsulfonic acid (e.g., "Mexoryl SL"; Cimex), camphor benzalkonium methosulfate (e.g., "Mexoryl SO"; Cimex), terephthalidenedicamphorsulfonic acid (e.g., "Mexoryl SX"; Cimex), and polyacrylamidomethylbenzylidene camphor (e.g., "Mexoryl SW"; Cimex).

[0023] Examples of phenylbenzimidazole derivatives include phenylbenzimidazole sulfonic acid (e.g., "Eusolex 232"; Merck) and disodium phenyldibenzimidazole tetrasulfonate (e.g., "Neo Heliopan AP"; Herman & Reimer).

[0024] Examples of triazine derivatives include bisethylhexyloxyphenol methoxyphenyl triazine (e.g., "Tinosorb S"; Ciba Specialty Chemicals), ethylhexyl triazone (e.g., "Uvinal T150"; BASF), diethylhexylbutamido triazone (e.g., "Uvasorb HEB"; Sigma-3V), 2,4,6-tris(diisobutyl-4'-aminobenzalmalonate)-s-triazine, and 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine.

[0025] Examples of phenylbenzotriazole derivatives include drometrizole trisiloxane (e.g., "Silatrizole"; Rhodia-Chemie), methylenebis(benzotriazolyltetramethylbutylphenol) (e.g., "Tinosorb M"; Ciba Specialty Chemicals).

[0026] Examples of anthranil derivatives include menthyl anthranilate (for example, "Neo Heliopan MA"; Herman & Reimer).

[0027] Examples of imidazoline derivatives include ethylhexyldimethoxybenzylidene dioxoimidazoline propionate.

[0028] Examples of benzalmalonate derivatives include polyorganosiloxanes having benzalmalonate functional groups (for example, polysilicone-15; "Parsol SLX"; DSM Nutrition Japan).

[0029] Examples of 4,4-diarylbutadiene derivatives include 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene.

[0030] Particularly preferred examples of UV absorbers include, but are not limited to, ethylhexyl methoxycinnamate, octocrylene, dimethicone diethyl benzalmalonate, polysilicon-15, 4-tert-butyl-4'-methoxydibenzoylmethane (t-butylmethoxydibenzoylmethane), ethylhexyl triazone, diethylaminohydroxybenzoyl hexyl benzoate, bisethylhexyloxyphenol methoxyphenyl triazine, oxybenzone, methylenebisbenzotriazolyltetramethylbutylphenol, phenylbenzimidazole sulfonic acid, 3-(4'-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor, homosalate, and ethylhexyl salicylate. Among these, when at least octocrylene is included as component (A), a good UV protection effect can be obtained.

[0031] However, when 4-tert-butyl-4'-methoxydibenzoylmethane is added, its amount is preferably 10 mass% or less based on the total amount of component (A). This is because 4-tert-butyl-4'-methoxydibenzoylmethane tends to hinder the improvement in UV protection effect due to heating when the polyhydric alcohol (B) and the ester oil (C) are added, making it difficult to realize the enhanced UV protection effect due to heat.

[0032] The ultraviolet scattering agent used in the present invention is not particularly limited, but specific examples include fine particle metal oxides such as zinc oxide, titanium oxide, iron oxide, cerium oxide, and tungsten oxide.

[0033] The ultraviolet scattering agent may be untreated or may be subjected to various hydrophobic surface treatments, but those subjected to hydrophobic surface treatments are preferably used. Surface treatment agents that can be used include those commonly used in the field of cosmetics, such as silicones such as dimethicone and alkyl-modified silicone, alkoxysilanes such as octyltriethoxysilane, dextrin fatty acid esters such as dextrin palmitate, and fatty acids such as stearic acid.

[0034] The ultraviolet protection agent (A) in the present invention includes an embodiment consisting of only an ultraviolet absorber, an embodiment consisting of only an ultraviolet scattering agent, and an embodiment containing both an ultraviolet absorber and an ultraviolet scattering agent.

[0035] The blending amount of (A) UV protection agent is not particularly limited, but is usually 5% by mass or more, for example, 5 to 40% by mass, preferably 6 to 40% by mass, and more preferably 7 to 35% by mass, relative to the total amount of the emulsion cosmetic. If the blending amount of (A) UV protection agent is less than 5% by mass, it is difficult to obtain a sufficient UV protection effect, and even if it is blended in more than 40% by mass, it is not possible to expect an increase in UV protection effect commensurate with the blending amount, and stability will be reduced, which is not preferable.

[0036] <(B) Polyhydric alcohols with an IOB value of 5.0 or less> The polyhydric alcohol (B) (hereinafter sometimes simply referred to as "component (B)") incorporated into the emulsion cosmetic of the present invention is often incorporated as a moisturizing agent in conventional cosmetics. In the present invention, by incorporating a specific polyhydric alcohol, it is possible to significantly improve the UV protection effect of the cosmetic after heat is applied to the skin compared to immediately after application.

[0037] The (B) polyhydric alcohol has an IOB of 5.0 or less, more preferably 3.0 or less, and even more preferably 2.5 or less. If the IOB value is too high, the effect of improving UV protection ability due to heat may not be sufficiently obtained. On the other hand, the lower limit of the IOB value is not particularly limited, but is preferably 0.5 or more, and more preferably 0.8 or more.

[0038] Here, IOB stands for Inorganic / Organic Balance, which is a value that represents the ratio of inorganic value to organic value and serves as an index of the degree of polarity of an organic compound. Specifically, the IOB value is expressed as IOB value = inorganic value / organic value. The "inorganic value" and "organic value" are set according to various atoms or functional groups, such as an "organic value" of 20 for one carbon atom in a molecule and an "inorganic value" of 100 for one hydroxyl group. The IOB value of an organic compound can be calculated by adding up the "inorganic value" and "organic value" of all atoms and functional groups in the organic compound (see, for example, Yoshio Koda, "Organic Conceptual Diagram - Fundamentals and Applications," pp. 11-17, Sankyo Publishing, 1984).

[0039] Furthermore, the polyhydric alcohol (B) preferably has an ether bond, which is thought to make it more soluble in water and also in oil than one that does not have an ether bond.

[0040] Examples of the polyhydric alcohol (B) that can be used in the present invention include polyalkylene glycols of the formula (I) described below, as well as butylene glycol, dipropylene glycol, diglycerin, propanediol, erythritol, xylitol, methyl gluceth-10, and sorbitol.

[0041] Here, the polyalkylene glycol is represented by the following formula (I): HO(RO) p H (I) (wherein RO represents an oxyalkylene group having 2 to 4 carbon atoms, and p is 3 to 500). It is expressed as: Specifically, the glycol is selected from those widely used in cosmetics, such as polyethylene glycol (also referred to as "PEG"), polypropylene glycol (also referred to as "PPG"), and polybutylene glycol (also referred to as "PBG").

[0042] Among these, preferred is polyethylene glycol in which, in the above formula (I), RO is an oxyethylene group and p is in the range of 3 to 500, more preferably 3 to 60. The average molecular weight of preferred polyethylene glycols is in the range of 150 to 23,000, more preferably 150 to 3,000. Specific examples include polyethylene glycol 300, polyethylene glycol 400, polyethylene glycol 1500, and polyethylene glycol 20,000.

[0043] Polyalkylene glycols with relatively smaller molecular weights tend to be more effective at improving UV protection by heat, and therefore, among the polyethylene glycols listed above, polyethylene glycol 300 or polyethylene glycol 400 provides particularly high effects.

[0044] The blending amount of component (B) is at least 1.0% by mass, more preferably 2.5% by mass or more, and 30% by mass or less, more preferably 25% by mass or less, based on the total amount of the emulsion cosmetic. If the blending amount is less than 1.0% by mass, the effect of improving UV protection ability due to heat may not be sufficiently achieved. In particular, if the blending amount is 2.5% by mass or more, this effect can be more reliably achieved. Furthermore, if the blending amount exceeds 30% by mass, stability and usability may be affected.

[0045] <(C) Ester oil with an IOB value of 0.3 or more> The ester oil (C) (hereinafter sometimes referred to simply as "component (C)") blended in the emulsion cosmetic of the present invention is an ester oil commonly used in cosmetics, and has an IOB value of 0.3 or more, preferably 0.38 or more. If the IOB value is too low, the effect of improving UV protection ability due to heat may not be sufficiently obtained.

[0046] The ester oil (C) used in the present invention is not particularly limited, but specific examples include propylene glycol dicaprylate (IOB=0.32), di-2-ethylhexyl succinate (IOB=0.32), pentaerythritol tetra-2-ethylhexanoate (IOB=0.35), glyceryl tri-2-ethylhexanoate (IOB=0.36), pentaerythritol tetraoctanoate (IOB=0.35), diisopropyl sebacate (IOB=0.40), and tripropylene glycol dineopentanoate (IOB=0.52).

[0047] The blending amount of (C) ester oil is 1.0% by mass or more, for example, 1.0 to 60% by mass, and preferably 3.0 to 50% by mass, based on the total amount of the emulsion cosmetic. If the blending amount is less than 1.0% by mass, the effect of improving UV protection ability due to heat may not be sufficiently obtained, while if the blending amount exceeds 60% by mass, stability and usability may be affected.

[0048] <Optional ingredients> In addition to the above components (A) to (C), the emulsion cosmetic of the present invention can contain components commonly used in cosmetics, provided that the effects of the present invention are not impaired. Examples of such components include alkylene oxide derivatives, lower alcohols, oil phase thickeners, surfactants, oils other than (C), powder components, etc.

[0049] Alkylene oxide derivatives, like the above-mentioned component (B), are often blended as moisturizing agents in ordinary cosmetic compositions. In the emulsion cosmetic of the present invention, polyoxyalkylene-polyoxyethylene copolymer dialkyl ether represented by the following formula (II) is particularly preferred. R1O-[(AO) m (EO) n ]-R2(II) In the above formula, AO represents an oxyalkylene group having 3 to 4 carbon atoms. Specific examples include an oxypropylene group, an oxybutylene group, an oxyisobutylene group, an oxytrimethylene group, and an oxytetramethylene group. Preferred are an oxypropylene group and an oxybutylene group. EO represents an oxyethylene group.

[0050] R1 and R2 each independently represent a hydrocarbon group having 1 to 4 carbon atoms or a hydrogen atom. Examples of the hydrocarbon group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, and a tert-butyl group. A methyl group or an ethyl group is preferred. R1 and R2 in one molecule may each be the same hydrocarbon group, or may be a mixture of hydrocarbon groups and hydrogen atoms, or may be a mixture of multiple hydrocarbon groups with different numbers of carbon atoms. However, for each of R1 and R2, the ratio of the number of hydrocarbon groups and hydrogen atoms (Y) to the number of hydrocarbon groups (X), (Y / X), is preferably 0.15 or less, more preferably 0.06 or less.

[0051] m is the average number of moles of AO added and is 1≦m≦70, preferably 2≦m≦20, and more preferably 2≦m≦10. n is the average number of moles of EO added and is 1≦n≦70, preferably 2≦n≦20, and more preferably 2≦n≦10. Furthermore, m+n is 40 or less, preferably 25 or less, and more preferably 20 or less.

[0052] The order in which AO and EO are added is not particularly limited. AO and EO may be added in blocks to form a block copolymer, or may be added randomly to form a random copolymer. Block copolymers include not only two-stage block copolymers but also copolymers containing three or more stages of blocks. Random copolymers are preferably used. The molecular weight of the polyoxyalkylene-polyoxyethylene copolymer dialkyl ether represented by the formula (II) is 100 to 10,000, preferably 150 to 5,000, further preferably 200 to 3,000, and even more preferably 300 to 2,000. The ratio of EO to the total of AO and EO in one molecule [EO / (AO+EO)] is preferably 20 to 80% by mass.

[0053] Specific examples of polyoxyalkylene-polyoxyethylene copolymer dialkyl ethers that can be preferably used in the present invention include, but are not limited to, the following polyoxypropylene-polyoxyethylene copolymer dimethyl ethers: PEG / PPG-9 / 2 dimethyl ether PEG / PPG-17 / 4 dimethyl ether PEG / PPG-14 / 7 dimethyl ether PEG / PPG-11 / 9 dimethyl ether PEG / PPG-55 / 28 dimethyl ether PEG / PPG-36 / 41 dimethyl ether PEG / PPG-6 / 3 dimethyl ether PEG / PPG-8 / 4 dimethyl ether PEG / PPG-6 / 11 dimethyl ether PEG / PPG-14 / 27 dimethyl ether

[0054] Polyoxyalkylene-polyoxyethylene copolymer dialkyl ethers with relatively smaller molecular weights tend to have better UV protection against heat. Therefore, among the polyoxypropylene-polyoxyethylene copolymer dimethyl ethers listed above, PEG / PPG-9 / 2 dimethyl ether and the like show the highest effectiveness.

[0055] Examples of lower alcohols include alcohols with 1 to 5 carbon atoms, such as ethanol and isopropanol. By incorporating a lower alcohol, the spreadability of the emulsion cosmetic can be improved when applied. When incorporating a lower alcohol, the amount can be, for example, 5 to 30% by mass of the total amount of the emulsion cosmetic.

[0056] Preferred oil phase thickeners are substances used as components that thicken the oil phase by dissolving in or swelling with oil in emulsion cosmetics, etc. Examples include dextrin fatty acid esters such as dextrin palmitate and dextrin myristate, sucrose fatty acid esters such as sucrose caprylate, solid or semi-solid hydrocarbon oils such as petrolatum, hydrogenated palm oil, and hydrogenated castor oil, organically modified clay minerals such as disteardimonium hectorite and benzyldimethylstearylammonium hectorite, and higher fatty acids having 8 to 22 carbon atoms that are solid at room temperature, such as lauric acid, myristic acid, palmitic acid, and stearic acid, or salts thereof.

[0057] In the case of water-in-oil emulsion cosmetics, the surfactant is preferably one that has a silicone skeleton (polysiloxane structure) and an HLB value of less than 8. For example, it is preferable to use polyether-modified silicone, polyether-alkyl co-modified silicone, polyglycerin-modified silicone, and / or polyglycerin-alkyl co-modified silicone, with polyether-modified silicone and polyether-alkyl-modified silicone being more preferred.

[0058] On the other hand, in the case of oil-in-water emulsion cosmetics, one or more nonionic surfactants selected from those conventionally used in oil-in-water emulsion cosmetics may be used, with those with an HLB value of 6 or higher being preferred. In particular, in terms of formulation stability and the effect of improving absorbance upon contact with water, it is particularly preferred to contain polyoxyethylene hydrogenated castor oil. Specific examples of polyoxyethylene hydrogenated castor oil include PEG-10 hydrogenated castor oil, PEG-20 hydrogenated castor oil, PEG-25 hydrogenated castor oil, PEG-30 hydrogenated castor oil, PEG-40 hydrogenated castor oil, PEG-50 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-80 hydrogenated castor oil, and PEG-100 hydrogenated castor oil. On the other hand, if polyoxyethylene hydrogenated castor oil is not included, it is preferred to use a nonionic surfactant with an HLB value of 8 or higher, preferably 10 or higher, and more preferably 12 or higher.

[0059] Furthermore, the emulsion cosmetic of the present invention may further contain, in addition to the (C) ester oil, volatile oils or non-volatile oils that are commonly used in cosmetics. Volatile oils include volatile hydrocarbon oils and volatile silicone oils. The volatile hydrocarbon oil is not particularly limited as long as it is a hydrocarbon oil that is volatile at room temperature (25°C) and has been conventionally used in cosmetics, etc. Specific examples include isododecane, isohexadecane, and hydrogenated polyisobutene. Volatile silicone oils are silicone oils that are volatile at room temperature (25°C) and have traditionally been used in cosmetics and the like, and include cyclic dimethylpolysiloxanes having 4 to 6 silicon atoms and linear dimethylpolysiloxanes having 2 to 5 silicon atoms. Specific examples include cyclic silicone oils such as hexamethylcyclotrisiloxane (D3), octamethyltetracyclosiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6), diphenylsiloxyphenyl trimethicone, and volatile dimethicone (commercially available products include KF-96L-1.5cs and KF-96L-2cs, manufactured by Shin-Etsu Chemical Co., Ltd.).

[0060] Examples of non-volatile oils include hydrocarbon oils, vegetable oils, ester oils, high molecular weight polyoxyalkylene glycols, and silicone oils. Specific examples include liquid oils and fats such as palm oil, linseed oil, camellia oil, macadamia nut oil, corn oil, olive oil, avocado oil, camellia oil, castor oil, safflower oil, apricot kernel oil, cinnamon oil, jojoba oil, grape oil, almond oil, rapeseed oil, sesame oil, sunflower oil, wheat germ oil, rice germ oil, rice bran oil, cottonseed oil, soybean oil, peanut oil, tea seed oil, evening primrose oil, egg yolk oil, cod liver oil, triglycerin, glyceryl trioctanoate, glyceryl triisopalmitate, and isostearic acid; hydrocarbon oils such as hydrogenated polyisobutene, liquid paraffin, squalane, and hydrogenated polydecene; and silicone oils such as polyoxybutylene polyoxypropylene glycol and non-volatile dimethicone (commercially available product is KF-96A-6cs, manufactured by Shin-Etsu Chemical Co., Ltd.). Ester oils with an IOB value of less than 0.3, such as cetyl ethylhexanoate, can also be blended within a range that does not impair the effects of the present invention.

[0061] It is also preferable to further contain spherical powder. By incorporating spherical powder, stickiness is suppressed, the feel during use is improved, and a smooth, pleasant texture can be achieved. Any spherical powder commonly used in cosmetics can be used without particular limitations. Examples include (meth)acrylic ester resin powder, polyamide resin powder (nylon powder), polyethylene powder, polystyrene powder, styrene-(meth)acrylic acid copolymer resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder, cellulose powder, and trimethylsilsesquioxane powder, as well as organopolysiloxane elastomer spherical powder or composite spherical powders using this as a base powder. The average particle size of the spherical powder is preferably 3 to 20 μm. If the particle size is less than 3 μm, the effect of suppressing stickiness is not observed, and if it is more than 20 μm, roughness may occur. The amount of spherical powder incorporated is not particularly limited, but is preferably 3 to 30% by mass, more preferably 7 to 20% by mass.

[0062] An example of a commercially available spherical organic resin powder is Ganzpearl (Aica Kogyo Co., Ltd.), and an example of a commercially available spherical silicone resin powder is Trefil E-505C, Trefil E-506C, Trefil E-506S, Trefil HP40T (all manufactured by Toray Dow Corning Silicones Co., Ltd.), Tospearl 2000B (Momentive Performance Materials Co., Ltd.), and silicone powders KSP-100 and KSP-300 (Shin-Etsu Chemical Co., Ltd.).

[0063] In addition to the above, the emulsion cosmetic of the present invention can contain ingredients commonly used in cosmetics, depending on the formulation to be prepared, as long as the effects of the present invention are not impaired. For example, pH adjusters, chelating agents, preservatives, antioxidants, drugs, alcohols, coloring agents, pigments, etc. can be appropriately contained. Examples of drugs include ascorbic acid (vitamin C), tranexamic acid, kojic acid, ellagic acid, arbutin, alkoxysalicylic acid, nicotinamide, glycyrrhizic acid, tocopherol, retinol, and salts or derivatives thereof (e.g., sodium L-ascorbate, magnesium L-ascorbate, L-ascorbic acid glucoside, 2-O-ethyl-L-ascorbic acid, 3-O-ethyl-L-ascorbic acid, sodium 4-methoxysalicylate, potassium 4-methoxysalicylate, dipotassium glycyrrhizinate, stearyl glycyrrhizinate, tocopherol acetate, retinol acetate, retinol palmitate, etc.).

[0064] The emulsion cosmetic of the present invention can be provided in the form of an oil-in-water emulsion cosmetic or a water-in-oil emulsion cosmetic. In general, water-in-oil emulsion cosmetics tend to be more effective in improving the UV protection effect due to heat than oil-in-water emulsion cosmetics. The specific dosage form of the emulsified cosmetic of the present invention is a milky lotion or cream, and can be produced using a conventional method suited to each dosage form. The emulsion cosmetic of the present invention can be used not only as a sunscreen cosmetic, but also as a makeup cosmetic such as a foundation or a makeup base imparted with a sunscreen effect, a hair cosmetic (including various hair products such as hair sprays and hair treatments for protecting hair and scalp from ultraviolet rays), and a spray-type cosmetic.

[0065] The emulsion cosmetic of the present invention has the novel property that the UV protection effect of the coating film is improved by heat. Here, "the UV protection effect is improved by heat" means that the thermal reaction rate calculated using the following formula exceeds 100% from the integrated absorbance value of the coating film before heat treatment (unheated sample) measured with a spectrophotometer or the like over a wavelength range of 280 to 400 nm and the integrated absorbance value of the coating film after heat treatment (heated sample) measured in the same manner. Thermal reaction rate (%) = (integrated absorbance value after heat treatment) / (integrated absorbance value before heat treatment) × 100 In the emulsion cosmetic of the present invention, the thermal reactivity rate is at least more than 100%, preferably 103% or more, more preferably 105% or more, even more preferably 110% or more, and particularly preferably 115% or more.

[0066] When investigating the improvement of UV protection effect due to heat, the heating temperature is preferably in the range of 30°C to 70°C, and can be, for example, 32°C or higher, 35°C or higher, 37°C or higher, or 40°C or higher, and can be 65°C or lower, 60°C or lower, 55°C or lower, or 50°C or lower. Heating temperatures above 70°C can cause problems such as melting of the resin measurement plate. In order to accurately evaluate the influence of heat, the heating time is preferably 1 minute or more, more preferably 10 minutes or more. The upper limit of the heating time is not particularly limited, but is usually 60 minutes or less, preferably 30 minutes or less. [Example]

[0067] The present invention will be described in more detail below with reference to specific examples, but the present invention is not limited to the following examples. Furthermore, the blending amounts in the following examples are expressed as % by mass unless otherwise specified. Before describing each example in detail, the evaluation methods employed will be described.

[0068] <Change in integrated absorbance value after thermal irradiation (thermal reaction rate)> The prepared emulsion cosmetic was applied to a PMMA skin mimic plate (SPFMASTER-PA01) at 2 mg / cm 2 The coating was applied with a finger for 60 seconds and then dried for 15 minutes to form a coating film. Using an uncoated plate as a control, the absorbance (280-400 nm) of the coating film was measured using a Hitachi U-3500 self-recording spectrophotometer, and the integrated absorbance value before heat treatment was calculated from the obtained measurement data. Next, the plate with the coating film was placed in a thermostatic bath and subjected to heat treatment at 37°C for 30 minutes, and the integrated absorbance value was determined in the same manner as above. The change in the integrated absorbance value before and after thermal irradiation (thermal reaction rate) was calculated using the following formula. Thermal reaction rate (%) = (integrated absorbance value after heat treatment) / (integrated absorbance value before heat treatment) × 100

[0069] (1) Water-in-oil emulsion cosmetics The water-in-oil emulsion cosmetic compositions shown in Table 1 below were prepared. Specifically, the powder was dispersed in the oily components mixed using a homomixer, and then the well-mixed aqueous components were added to obtain the compositions.

[0070] [Table 1]

[0071] As shown in Table 1, the incorporation of a polyhydric alcohol with an IOB value of 5.0 or less was confirmed to improve the UV protection effect due to heat (Test Examples 1 to 4), but this effect could not be confirmed when glycerin with an IOB value that was too high (IOB value = 6.0) was used (Test Example 5). Also, it was observed that the lower the molecular weight of polyethylene glycol, the greater the improvement in UV protection effect due to heat.

[0072] (2) Water-in-oil emulsion cosmetics The water-in-oil emulsion cosmetic compositions shown in Table 2 below were prepared.

[0073] [Table 2]

[0074] As shown in Table 2, by incorporating an ester oil with an IOB value of 0.3 or more, it was confirmed that the UV protection effect due to heat was improved (Test Examples 6 to 8). In particular, when an ester oil with an IOB value of 0.38 or more was used, the UV protection effect was greatly improved. On the other hand, when cetyl ethylhexanoate with an IOB value that was too low was used, the same effect could not be confirmed (Test Example 9).

[0075] (3) Water-in-oil emulsion cosmetics The water-in-oil emulsion cosmetic compositions shown in Table 3 below were prepared.

[0076] [Table 3]

[0077] As shown in Table 3, when t-butyl methoxydibenzoylmethane (4-tert-butyl-4'-methoxydibenzoylmethane) was blended as the (A) UV protection agent, a high thermal reactivity was obtained by setting the blending amount to 10 mass% or less of the total amount of the (A) UV protection agent.

[0078] (4) Water-in-oil emulsion cosmetics The water-in-oil emulsion cosmetic samples shown in Table 4 below were prepared.

[0079] [Table 4]

[0080] As shown in Table 4, by further blending an alkylene oxide derivative (PEG / PPG-9 / 2 dimethyl ether) in addition to a polyhydric alcohol (polyethylene glycol) with an IOB value of 5.0 or less, the improvement in the UV protection effect due to heat was more significant.

[0081] (5) Water-in-oil emulsion cosmetics The water-in-oil emulsion cosmetic samples shown in Table 5 below were prepared.

[0082] [Table 5]

[0083] As shown in Table 5, it was confirmed that increasing the blending amount of polyhydric alcohol tends to increase the UV protection effect. In particular, by making the blending amount of polyhydric alcohol 1% by mass or more, the improvement of the UV protection effect could be more reliably achieved.

[0084] (6) Water-in-oil emulsion cosmetics The water-in-oil emulsion cosmetic samples shown in Table 6 below were prepared.

[0085] [Table 6] As shown in Table 6, when octocrylene was used as the ultraviolet protection agent (A), the higher the blending amount of octocrylene, the higher the thermal reactivity rate obtained.

[0086] (7) Water-in-oil emulsion cosmetics and oil-in-water emulsion cosmetics As shown in Table 7 below, samples of a water-in-oil (W / O) emulsion cosmetic and an oil-in-water (O / W) emulsion cosmetic having similar compositions were prepared.

[0087] [Table 7]

[0088] As shown in Table 7, it was confirmed that the UV protection effect was improved by heating for both the water-in-oil and oil-in-water cosmetic compositions.

[0089] (8) Oil-in-water emulsion cosmetics The oil-in-water emulsion cosmetic compositions shown in Table 8 below were prepared.

[0090] [Table 8]

[0091] As shown in Table 8, when t-butyl methoxydibenzoylmethane (4-tert-butyl-4'-methoxydibenzoylmethane) was blended as the (A) UV protection agent, a high thermal reactivity was obtained by setting the blending amount to 10 mass% or less of the total amount of the (A) UV protection agent.

[0092] The formulations of the cosmetic of the present invention are exemplified below. It goes without saying that the present invention is not limited to these formulation examples and is defined by the claims. All blend amounts are expressed in mass % relative to the total amount of the cosmetic.

[0093] Formulation example 1: Water-in-oil sunscreen (Ingredient name) Compounding amount (mass%) water residue Ethanol 10 Polyethylene Glycol 400 10 Disteardimonium Hectorite 0.5 PEG-9 Polydimethylsiloxyethyl Dimethicone 2 Diisopropyl Sebacate 10 Dimethicone 20 Octocrylene 5 Bis-ethylhexyloxyphenol methoxyphenyl triazine 1 Diethylaminohydroxybenzoylhexyl benzoate 1 Ethylhexyl Triazone 1 Ethylhexyl methoxycinnamate 5 Hydrophobic treated titanium dioxide particles 2 Hydrophobic treated zinc oxide particles 10 Hydrophobic treated talc 2 Spherical Silica 2 Spherical silicone rubber powder 2 Spherical cross-linked PMMA powder 2 Chelating agent (appropriate amount)

[0094] Formulation example 2: Two-layer makeup base (Ingredient name) Compounding amount (mass%) Purified water remainder Ethanol 5 Polyethylene Glycol 300 5 Glycerin 1 Xylitol 1 Tormentilla extract 0.3 Sodium hyaluronate 0.1 2-O-Ethyl-L-ascorbic acid 0.1 Dipotassium glycyrrhizinate 0.05 Isododecane 3 Diisopropyl Sebacate 10 PBG / PPG-9 / 1 copolymer 1 Dimethicone 13 Caprylyl Methicone 3 Highly Polymerized Aminopropyl Dimethicone 20% Dimethicone 1 50% Trifluoroalkyldimethyltrimethylsiloxysilicate Dimethicone Solution 3 Dextrin palmitate 0.5 Ethylhexyl methoxycinnamate 7 Octocrylene 5 Diethylaminohydroxybenzoylhexyl benzoate 1 Bis-ethylhexyloxyphenol methoxyphenyl triazine 0.5 Hydrophobic fine particle titanium dioxide 2 Hydrophobic treated zinc oxide particles 5 Hydrophobic treated pigment grade titanium dioxide 1 Hydrophobic treated iron oxide 0.07 Methyl methacrylate crosspolymer 2 (Vinyl dimethicone / methicone silsesquioxane) crosspolymer 2 Hydrophobic treated talc 2 PEG-9 Polydimethylpolysiloxyethyl Dimethicone 1.5 PEG / PPG-19 / 19 Dimethicone 0.3 Dimethyl distearyl ammonium hectorite 0.4 Isostearic acid 0.3 EDTA・3Na Appropriate amount Salt (appropriate amount) Sodium pyrosulfite (appropriate amount) Tocopherol (appropriate amount) Fragrance (appropriate amount)

[0095] Formulation example 3: Cream foundation (Ingredient name) Compounding amount (mass%) Purified water remainder Ethanol 5 Phenoxyethanol 1 Polyethylene Glycol 300 5 Glycerin 3 Erythritol 1 Xylitol 1 Tormentilla Extract 1 Glycylglycine 0.1 Tranexamic acid 1 Dipotassium glycyrrhizinate 0.05 Tripropylene glycol pivalate 2 Diisopropyl Sebacate 5 Dimethicone 10 Cyclomethicone 5 50% trisiloxysilicate solution in cyclopentasiloxane 2 Dextrin palmitate 1 Ethylhexyl methoxycinnamate 7 Hydrophobic fine particle titanium dioxide 3 Hydrophobic fine particle zinc oxide 3 Hydrophobic treated pigment grade titanium dioxide 6 Hydrophobic treated iron oxide 3.2 Hydrophobic treated barium sulfate coated titanium mica 0.01 Hydrophobic treated titanium mica 0.01 Dimethicone Crosspolymer 13% Cyclopentasiloxane Blend 2 Polymethylsilsesquioxane 2 Methyl methacrylate crosspolymer 2 Hydrophobic fine silica particles 0.5 Lauryl PEG-9 Polydimethylpolysiloxyethyl Dimethicone 2 Dimethicone / PEG-10 / 15 Crosspolymer 1 Dimethyl distearyl ammonium hectorite 1 Isostearic acid 0.2 Tocopherol (appropriate amount) EDTA・3Na Appropriate amount Salt (appropriate amount) Sodium pyrosulfite (appropriate amount) Fragrance (appropriate amount)

[0096] Formulation example 4: Aerosol spray sunscreen (Ingredient name) Compounding amount (mass%) Purified water remainder Ethanol 5 Polyethylene Glycol 300 7 Silica 0.5 Glycerin 1 PEG / PPG-14 / 7 dimethyl ether 1 DL-α-Tocopherol Acetate 0.5 D-glutamic acid 0.1 Stearyl glycyrrhizinate 0.1 Isododecane 10 Glyceryl tri-2-ethylhexanoate 5 Isopropyl myrstate 3 Diisopropyl Sebacate 5 PBG / PPG-9 / 1 copolymer 1 Dimethicone 13 50% trisiloxysilicate solution in cyclopentasiloxane 0.5 Sucrose tetrastearate triacetate 0.5 Dextrin palmitate 1 Ethylhexyl methoxycinnamate 5 Diethylaminohydroxybenzoylhexyl benzoate 2 Bis-ethylhexyloxyphenol methoxyphenyl triazine 1 Polysilicone-15 2 Octocrylene 5 Methyl methacrylate crosspolymer 5 (Vinyl dimethicone / methicone silsesquioxane) crosspolymer 3 Hydrophobic treated talc 1 Cetyl PEG / PPG-10 / 1 Dimethicone 1 Lauryl PEG-9 Polydimethylpolysiloxyethyl Dimethicone 1 Dimethyl distearyl ammonium hectorite 0.5 Isostearic acid 0.3 Sorbitan sesquiisostearate 0.3 EDTA・3Na Appropriate amount Tocopherol (appropriate amount) Fragrance (appropriate amount) The above components were mixed to prepare a concentrate, which was then filled into a spray can in a ratio of 50:50 between the concentrate and LPG to obtain an aerosol spray type sunscreen.

[0097] The present invention includes the following aspects. [Section 1] (A) an ultraviolet protection agent; (B) a polyhydric alcohol having an IOB value of 5.0 or less; (C) Ester oil with an IOB value of 0.3 or more An emulsified cosmetic comprising: [Section 2] 2. The emulsion cosmetic according to claim 1, wherein when the (A) ultraviolet protection agent contains 4-tert-butyl-4'-methoxydibenzoylmethane, the blending amount thereof is 10 mass % or less based on the total amount of the (A) ultraviolet protection agent. [Section 3] (B) the polyhydric alcohol is at least one selected from the group consisting of polyalkylene glycol, butylene glycol, dipropylene glycol, diglycerin, propanediol, erythritol, xylitol, methyl gluceth-10, and sorbitol; The polyalkylene glycol has the following formula (I): HO(RO) p H (I) 3. The emulsion cosmetic according to claim 1 or 2, which satisfies the formula (wherein RO represents an oxyalkylene group having 2 to 4 carbon atoms, and p is 3 to 500). [Section 4] (B) The emulsion cosmetic according to item 3, wherein the polyhydric alcohol is polyethylene glycol having an average molecular weight of 150 to 23,000. [Section 5] 5. The emulsion cosmetic according to any one of items 1 to 4, wherein the IOB value of the (C) ester oil is 0.38 or more. [Section 6] 6. The emulsion cosmetic according to any one of items 1 to 5, wherein the (A) UV protection agent includes at least octocrylene. [Section 7] The following formula (II): R1O-[(AO) m (EO) n ]-R2(II) (In the formula, R1 and R2 each independently represent a hydrocarbon group having 1 to 4 carbon atoms or a hydrogen atom, AO represents an oxyalkylene group having 3 to 4 carbon atoms, and EO represents an oxyethylene group, and 1≦m≦70, 1≦n≦70, and m+n≦40.) 7. The emulsion cosmetic according to any one of items 1 to 6, further comprising a polyoxyalkylene-polyoxyethylene copolymer dialkyl ether represented by the formula: [Section 8] 8. The emulsion cosmetic according to any one of items 1 to 7, which is a water-in-oil emulsion cosmetic.

Claims

1. (A) an ultraviolet protection agent in an amount of 5 to 40% by mass relative to the total amount of the cosmetic; (B) A polyhydric alcohol having an IOB value of 5.0 or less and containing 2.5% by mass or more of the total amount of the cosmetic, and having the following formula (I): HO(RO) ｐ H (I) (wherein RO represents an oxyalkylene group having 2 to 4 carbon atoms, and p is an integer of 3 to 500). one or more selected from the group consisting of polyalkylene glycols represented by the formula (I), diglycerin, propanediol, erythritol, methyl gluceth-10, and sorbitol; (C) Ester oil with an IOB value of 0.3 or more Including, The water-in-oil emulsion cosmetic composition, wherein the ultraviolet protection agent (A) contains octocrylene in an amount of 3% by mass or more based on the total amount of the cosmetic composition.

2. The component (B) is a compound represented by the following formula (I): HO(RO) ｐ H (I) (wherein RO represents an oxyalkylene group having 2 to 4 carbon atoms, and p is an integer of 3 to 500) The emulsion cosmetic according to claim 1.

3. 3. The emulsion cosmetic according to claim 2, wherein the component (B) is polyethylene glycol having an average molecular weight of 150 to 23,000.

4. (D) Formula (II): 2 １ O[(AO) ｍ (59) ｎ )-2 ２ (99) (In the formula, R １ and R ２ each independently represent a hydrocarbon group having 1 to 4 carbon atoms or a hydrogen atom, AO represents an oxyalkylene group having 3 to 4 carbon atoms, and EO represents an oxyethylene group, and 1≦m≦70, 1≦n≦70, and m+n≦40.

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