Oil-in-water emulsion cosmetics

Abstract

To provide an oil-in-water type emulsion cosmetic having a high SPF value because of good washability, good blending stability of an ultraviolet scattering agent in an oil-in-water system and good dispersibility of an ultraviolet scattering agent.SOLUTION: There is provided an oil-in-water type emulsion cosmetic which comprises (A) 5 mass% or more of an ultraviolet scattering agent subjected to hydrophobic treatment, (B) a nonionic surfactant having an HLB of 14 or more, (C) an oil component, and (D) a dispersant, wherein the hydrophobic treatment is performed by a higher fatty acid (provided that a divalent metal salt of a higher fatty acid is excluded) or a higher fatty acid ester and the ultraviolet scattering agent (A) is contained in the internal phase.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water emulsion cosmetic containing a hydrophobically treated ultraviolet scattering agent in the internal phase. [Background technology]

[0002] Oil-in-water emulsion compositions provide a refreshing and moist feel when applied to the skin, and are therefore widely used as bases for external skin preparations such as skin cosmetics that are applied directly to the skin. In particular, they are suitable for use in sunscreen cosmetics because of their moist and moist feel when used.

[0003] Meanwhile, oil-in-water emulsion cosmetics containing powders such as titanium oxide and zinc oxide, i.e., so-called UV scattering agents, are known as sunscreen cosmetics. For example, Patent Document 1 describes an oil-in-water sunscreen cosmetic containing titanium oxide particles that have been surface-treated with a surface treatment agent having a carboxyl group, a water-soluble polymer having structural units derived from (meth)acrylic acid or sulfonic acid, a nonionic surfactant with an HLB value of 6 to 10, and an oil that is liquid at 25°C.

[0004] Furthermore, oil-in-water emulsion compositions are known in which a hydrophobized metal oxide is present in the internal phase (oil phase) so that the inherently fresh feel of the oil-in-water emulsion composition is not impaired even when a high amount of the hydrophobized metal oxide is incorporated. For example, Patent Document 2 describes an oil-in-water emulsion composition containing a polyether-modified silicone having an HLB of 5 to 14, a hydrophilic thickener, a metal oxide that has been hydrophobized with methylhydrogenpolysiloxane, dimethylpolysiloxane, fatty acid dextrin, or the like, and an oil component, in which the hydrophobized metal oxide is present in the internal phase. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-197434 [Patent Document 2] Patent No. 6535329 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0006] It is unclear whether the oil-in-water sunscreen cosmetic described in Patent Document 1 contains titanium oxide in its internal phase. Furthermore, since it may contain an ultraviolet absorber, if the SPF (Sun Protection Factor) value is to be increased, it is sufficient to incorporate an ultraviolet absorber, and therefore there is little need to incorporate a high amount of ultraviolet scattering agent. In fact, in many of the examples in Patent Document 1, the titanium oxide content is around 8% by mass. On the other hand, users who prefer natural products or have sensitive skin tend to desire cosmetics that do not contain ultraviolet absorbers, which are relatively harsh on the skin. Furthermore, while Patent Document 1 describes that the cosmetic is easily washed off the skin with a cleanser or the like, no consideration is given to cleansing properties when a high amount of ultraviolet scattering agent is incorporated.

[0007] The present invention has been made in view of the above problems, and aims to provide an oil-in-water emulsion cosmetic that has good cleansing properties, good blending stability of an ultraviolet scattering agent in an oil-in-water system, and good dispersibility of the ultraviolet scattering agent, resulting in a high SPF value. [Means for solving the problem]

[0008] The oil-in-water emulsion cosmetic of the present invention comprises: (A) a hydrophobized ultraviolet scattering agent in an amount of 5% by mass or more relative to the total amount of the cosmetic; (B) a nonionic surfactant having an HLB value of 14 or more; (C) oil, (D) a dispersant; An oil-in-water emulsion cosmetic comprising: The hydrophobic treatment is a hydrophobic treatment using a higher fatty acid (excluding divalent metal salts of higher fatty acids) or a higher fatty acid ester, (A) An ultraviolet scattering agent is contained in the internal phase.

[0009] The content of the (A) ultraviolet scattering agent is preferably 20 to 30% by mass relative to the total amount of the cosmetic.

[0010] (B) The nonionic surfactant is preferably a fatty acid polyglyceryl and / or polyoxyethylene hydrogenated castor oil.

[0011] The silicone oil in the oil component (C) may be less than 5% by mass relative to the total amount of the cosmetic.

[0012] The amount of non-volatile oil having a molecular weight exceeding 400 in the oil component (C) is preferably 30% by mass or more relative to the total amount of the oil component.

[0013] Preferably, the fixed oil having a molecular weight above 400 is caprylic / capric triglyceride.

[0014] The dispersant (D) preferably contains sorbitan sesquiisostearate in an amount of 35% by mass or more based on the total amount of the dispersant.

[0015] The oil-in-water emulsion cosmetic of the present invention preferably does not contain an ultraviolet absorber. [Effects of the Invention]

[0016] The oil-in-water emulsion cosmetic of the present invention comprises: (A) a hydrophobized ultraviolet scattering agent in an amount of 5% by mass or more relative to the total amount of the cosmetic; (B) a nonionic surfactant having an HLB value of 14 or more; (C) oil, (D) a dispersant; An oil-in-water emulsion cosmetic comprising: The hydrophobic treatment is a hydrophobic treatment using a higher fatty acid (excluding divalent metal salts of higher fatty acids) or a higher fatty acid ester, and (A) an ultraviolet scattering agent is contained in the internal phase, so that the cleaning properties are good, the blending stability of the ultraviolet scattering agent in oil-in-water systems is good, and the dispersibility of the ultraviolet scattering agent is good, so that a high SPF value can be achieved. DETAILED DESCRIPTION OF THE INVENTION

[0017] The oil-in-water emulsion cosmetic of the present invention comprises: (A) a hydrophobized ultraviolet scattering agent in an amount of 5% by mass or more relative to the total amount of the cosmetic; (B) a nonionic surfactant having an HLB value of 14 or more; (C) oil, (D) a dispersant; An oil-in-water emulsion cosmetic comprising: The hydrophobic treatment is a hydrophobic treatment using a higher fatty acid (excluding divalent metal salts of higher fatty acids) or a higher fatty acid ester, (A) An ultraviolet scattering agent is contained in the internal phase.

[0018] Each component will be described in detail below. In this specification, PEG stands for polyethylene glycol, PPG for polypropylene glycol, POE for polyoxyethylene, and POP for polyoxypropylene.

[0019] (A) Hydrophobized UV scattering agent The hydrophobized UV scattering agent contained in the oil-in-water emulsion cosmetic of the present invention (hereinafter simply referred to as (A) UV scattering agent) is one that has been hydrophobized with a higher fatty acid (excluding divalent metal salts of higher fatty acids) or a higher fatty acid ester. "Excluding divalent metal salts of higher fatty acids" means that the higher fatty acid treatment does not include treatment with divalent metal salts of higher fatty acids. Hereinafter, parentheses will be omitted. Because the (A) UV scattering agent has been hydrophobized with a higher fatty acid or a higher fatty acid ester, good cleansing properties can be maintained and a high amount of UV scattering agent can be incorporated.

[0020] Suitable examples of higher fatty acids include palmitic acid, isostearic acid, stearic acid, lauric acid, myristic acid, behenic acid, oleic acid, rosin acid, 12-hydroxystearic acid, etc. Examples of higher fatty acid esters include dextrin fatty acid esters, cholesterol fatty acid esters, sucrose fatty acid esters, and starch fatty acid esters of the above higher fatty acids.

[0021] The powder (mother nucleus) to be hydrophobized is not particularly limited as long as it is a powder used as an ultraviolet scattering agent in the field of cosmetics, and specific examples include one or more selected from titanium oxide, zinc oxide, barium sulfate, iron oxide, talc, mica, sericite, kaolin, titanium mica, iron blue, chromium oxide, chromium hydroxide, silica, cerium oxide, etc.

[0022] (A) The hydrophobized UV scattering agent is contained in an amount of 5% by mass or more, preferably 20 to 30% by mass, and more preferably 20 to 28% by mass, based on the total amount of the cosmetic. By containing 20% ​​by mass or more of the hydrophobized UV scattering agent based on the total amount of the cosmetic, the SPF value can be increased, and by containing 30% by mass or less, usability can be maintained at a higher level.

[0023] (B) Nonionic surfactants with an HLB of 14 or more The oil-in-water emulsion cosmetic of the present invention contains (B) a nonionic surfactant with an HLB value of 14 or more (hereinafter simply referred to as (B) nonionic surfactant). HLB (Hydrophile-Lipophile Balance) represents the degree of affinity for water and oil, and by incorporating a nonionic surfactant with an HLB value of 14 or more, the cosmetic becomes an oil-in-water type, and the incorporation stability of (A) an ultraviolet scattering agent into the oil-in-water system can be improved.

[0024] The nonionic surfactant is not particularly limited as long as it has an HLB value of 14 or higher and is commonly used in cosmetics, and examples include glycerin or polyglycerin fatty acid esters, propylene glycol fatty acid esters, polyoxyethylene (POE) sorbitan fatty acid esters, POE sorbit fatty acid esters, POE glycerin fatty acid esters, POE fatty acid esters, POE alkyl ethers, POE alkylphenyl ethers, POE-polyoxypropylene (POP) alkyl ethers, POE castor oil or POE hydrogenated castor oil, alkanolamides, POE propylene glycol fatty acid esters, POE alkylamines, POE fatty acid amides, POE-modified silicones, POE-POP-modified silicones, and the like.

[0025] Among these, fatty acid polyglyceryl or polyoxyethylene hydrogenated castor oil is particularly preferred. For example, preferred examples of fatty acid polyglyceryl include polyglyceryl-10 stearate, polyglyceryl-10 myristate, and polyglyceryl-10 laurate, and preferred examples of polyoxyethylene hydrogenated castor oil include PEG100 hydrogenated castor oil and PEG60 hydrogenated castor oil. These may be used alone or in combination. When multiple types of nonionic surfactants are used, the weighted average of the HLB values ​​of each nonionic surfactant is the HLB value of the entire nonionic surfactant. From the viewpoint of emulsion stability, polyglyceryl-10 stearate, PEG100 hydrogenated castor oil, and PEG60 hydrogenated castor oil are more preferred.

[0026] The content of (B) nonionic surfactant is preferably 1.5 to 6.0% by mass, more preferably 2.0 to 4.5% by mass, and even more preferably 2.5 to 3.5% by mass, of the total cosmetic. When the content of (B) nonionic surfactant is 1.5% by mass or more of the total cosmetic, the blending stability of (A) UV scattering agent in an oil-in-water system can be improved and cleansing properties can be improved, while when the content is 6.0% by mass or less, usability can be improved.

[0027] (C) Oil content The oil (C) used in the oil-in-water emulsion cosmetic of the present invention, together with the ultraviolet scattering agent (A), constitutes the internal phase (oil phase) of the oil-in-water emulsion cosmetic. Examples of oils that can be used in the oil-in-water emulsion cosmetic of the present invention include hydrocarbon oils, ester oils, silicone oils, fats and oils, fragrances, ultraviolet absorbers, etc.

[0028] Examples of hydrocarbon oils include liquid paraffin, squalane, squalene, paraffin, isoparaffin, ceresin, isododecane, isohexadecane, ozokerite, pristane, and petrolatum.

[0029] Ester oils include caprylic / capric triglyceride, pentaerythrityl tetraethylhexanoate, cetyl ethylhexanoate, jojoba oil, phytosteryl / octyldodecyl lauroyl glutamate, triisostearin, glyceryl diisostearate, triethylhexanoin, phytosteryl / behenyl dimer dilinoleate, phytosteryl / isostearyl / cetyl / stearyl / isostearyl / cetyl / stearyl / behenyl dimer dilinoleate, isopropyl palmitate, and macadamia nut fatty acid phytosteryl. Tosteryl, Pentaerythrityl Tetrabehenate / Tetrabenzoate / Tetraethylhexanoate, Ethylhexyl Palmitate, Myristyl Myristate, Isopropyl Myristate, Tripropylene Glycol Dipivalate, Diisopropyl Sebacate, Isodecyl Neopentanoate, Octyl Octanoate, Nonyl Nonanoate, Cetyl Octanoate, Octyldodecyl Myristate, Butyl Stearate, Hexyl Laurate, Decyl Oleate, Hexyldecyl Dimethyloctanoate, Cetyl Lactate, Myristyl Lactate, Isocetyl Stearate, Isocetyl Isostearate , cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, tripropylene glycol pivalate, diisostearyl malate, glycerin di-2-heptylundecanoate, glycerin diisostearate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, tri-2-ethyl Glyceryl hexanoate, glyceryl trioctanoate, glyceryl triisopalmitate, cetyl 2-ethylhexanoate-2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate,Examples include 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, 2-ethylhexyl succinate, and triethyl citrate.

[0030] Examples of silicone oils include linear polysiloxanes (e.g., dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc.), cyclic polysiloxanes (e.g., octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.), silicone resins that form a three-dimensional network structure, silicone rubber, various modified polysiloxanes (amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, fluorine-modified polysiloxane, etc.), and acrylic silicones.

[0031] Examples of liquid oils and fats include linseed oil, camellia oil, macadamia nut oil, corn oil, olive oil, avocado oil, camellia oil, castor oil, safflower oil, rapeseed oil, soybean oil, peanut oil, triglycerin, sesame oil, persic oil, wheat germ oil, cottonseed oil, perilla oil, tea seed oil, kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, etc. Examples of solid oils and fats include cocoa butter, coconut oil, hardened coconut oil, palm oil, palm kernel oil, Japan wax kernel oil, hardened oil, Japan wax, and hardened castor oil.

[0032] Examples of the ultraviolet absorber include benzoic acid-based ultraviolet absorbers such as para-aminobenzoic acid (PABA), PABA monoglycerin ester, N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA ethyl ester, and N,N-dimethyl PABA butyl ester; anthranilic acid-based ultraviolet absorbers such as homomenthyl-N-acetylanthranilate; amyl salicylate, menthyl salicylate, homomenthyl salicylate, and octyl salicylate; salicylic acid-based ultraviolet absorbers such as phenyl salicylate, phenyl salicylate, benzyl salicylate, and p-isopropanol phenyl salicylate; octyl cinnamate, ethyl 4-isopropyl cinnamate, methyl 2,5-diisopropyl cinnamate, ethyl 2,4-diisopropyl cinnamate, methyl 2,4-diisopropyl cinnamate, propyl p-methoxycinnamate, isopropyl p-methoxycinnamate, isoamyl p-methoxycinnamate, octyl Cinnamic acids such as p-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-paramethoxycinnamate, and 3,4,5-trimethoxycinnamate 3-methyl-4-[methylbis(trimethylsiloxy)silyl]butyl -based ultraviolet absorbers; examples thereof include 2-phenyl-5-methylbenzoxazole, 2,2'-hydroxy-5-methylphenylbenzotriazole, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2-(2'-hydroxy-5'-methylphenylbenzotriazole, dibenzalazine, dianisoylmethane, 4-methoxy-4'-t-butyldibenzoylmethane, 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, and octocrylene.

[0033] It should be noted that users who prefer natural cosmetics or who have sensitive skin tend to desire cosmetics that do not contain ultraviolet absorbers, which are relatively harsh on the skin. However, even if the oil-in-water emulsion cosmetic of the present invention does not contain an ultraviolet absorber, it is possible to incorporate a high amount of (A) ultraviolet scattering agent, thereby enabling the cosmetic to have a high SPF value.

[0034] The blending amount of the oil component (C) in the cosmetic of the present invention is not particularly limited, but is preferably 5 to 35 mass % and more preferably 10 to 30 mass % based on the total amount of the cosmetic.

[0035] The silicone oil in the (C) oil component can be less than 5% by mass of the total cosmetic. Natural-oriented users and those with sensitive skin tend to avoid cosmetics containing silicone oil, but the emulsion stability of the cosmetic of the present invention is not affected even if the silicone oil content is less than 5% by mass of the total cosmetic, or even if the cosmetic does not contain any silicone oil. In fact, the absence of silicone oil improves the dispersibility of the (A) UV scattering agent, allowing for a higher SPF value.

[0036] The (C) oil preferably contains 30% by mass or more of a non-volatile oil having a molecular weight exceeding 400 relative to the total amount of oil. By containing 30% by mass or more of a non-volatile oil having a molecular weight exceeding 400 relative to the total amount of oil, emulsion stability can be improved. More preferably, the non-volatile oil having a molecular weight exceeding 400 is contained in an amount of 40 to 90% by mass, and even more preferably 50 to 80% by mass, relative to the total amount of oil.

[0037] Preferred examples of non-volatile oils having a molecular weight of more than 400 include caprylic / capric triglyceride, squalane, triethylhexanoin, pentaerythrityl tetraethylhexanoate, hydrogenated polyisobutene, diisostearyl malate, neopentyl glycol dicaprate, triisostearin, and jojoba oil.

[0038] (D) Dispersant The oil-in-water emulsion cosmetic of the present invention contains (D) a dispersant. Examples of dispersants include sorbitan sesquiisostearate, isostearic acid, palmitic acid, and silicone surfactants, and one type can be used alone or two or more types can be used in appropriate combination. Among these, sorbitan sesquiisostearate is preferred from the viewpoints of its ability to stably disperse (A) the UV scattering agent in the internal phase and its ability to increase the SPF value due to its good dispersibility.

[0039] The blending amount of (D) dispersant is not particularly limited, but is preferably 0.5 to 5% by mass, more preferably 1.0 to 3.0% by mass, and even more preferably 1.5 to 2.5% by mass, of the total amount of the cosmetic. When the blending amount of (D) dispersant is 0.5% by mass or more, the dispersibility of (A) UV scattering agent can be improved and the SPF value can be increased, and when the blending amount is 5% by mass or less, usability can be maintained good.

[0040] When the (D) dispersant contains sorbitan sesquiisostearate, the blending amount of sorbitan sesquiisostearate is preferably 35% by mass or more relative to the total amount of dispersant. It is more preferably 50 to 100% by mass, and even more preferably 70 to 100% by mass. The entire (D) dispersant may be sorbitan sesquiisostearate. By blending an amount of sorbitan sesquiisostearate of 35% by mass or more relative to the total amount of dispersant, the dispersibility of the (A) ultraviolet scattering agent can be improved, and the SPF value can be further increased.

[0041] The oil-in-water emulsion cosmetic of the present invention can contain other optional components that can be incorporated into ordinary cosmetics or quasi-drugs, provided that the effects of the present invention are not impaired. Examples of other optional components include, but are not limited to, powder components, coloring agents, moisturizing agents, aqueous thickeners, preservatives, and various pharmaceuticals.

[0042] Examples of powder components include extender pigments such as talc, mica, kaolin, silica, corn starch, and cellulose, and polymer powders such as polyethylene powder, polymethyl methacrylate powder, and nylon powder.

[0043] Examples of moisturizing agents include polyhydric alcohols such as glycerin, 1,3-butylene glycol, dipropylene glycol, and propylene glycol, and water-soluble polymers such as trehalose, hyaluronic acid, and chondroitin sulfate.

[0044] Examples of aqueous thickeners include succinoglycan, (dimethylacrylamide / sodium acryloyldimethyltaurate) crosspolymer, cellulose gum, carboxyvinyl polymer, xanthan gum, (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, and the like.

[0045] The oil-in-water emulsion cosmetic of the present invention can be produced, for example, by dispersing powder in an oil phase component using a homomixer or the like, and then adding the obtained oil phase to an aqueous phase using a homomixer or the like, followed by stirring and emulsifying.

[0046] The oil-in-water emulsion cosmetic of the present invention can be provided as a cosmetic in various formulations such as a liquid, emulsion, cream, gel, or Bavarian cream. Furthermore, the oil-in-water emulsion cosmetic of the present invention can be provided as a sunscreen cosmetic, a cosmetic containing a coloring agent, a foundation, a makeup base, a BB cream, and the like. [Example]

[0047] The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. All blend amounts are in mass % unless otherwise specified.

[0048] (Examples 1 and 2 and Comparative Example 1 and 2) Oil-in-water emulsion cosmetics were prepared according to the formulations shown in Table 1 below, and the prepared cosmetics were evaluated according to the following criteria.

[0049] (stability) A cylindrical container was half-filled with the prepared oil-in-water emulsion cosmetic (sample), and the sample was subjected to a rolling motion at 45 rpm for 4 hours at room temperature using a rolling tester (manufactured by Nigorikawa Rika Kogyo Co., Ltd.), and the changes in the state of the sample were observed and evaluated according to the following criteria. A: No change is observed B: A slight change in viscosity or an increase in emulsion particles is observed. C: Significant change in viscosity or increase in emulsified particles is observed, making it difficult to use

[0050] (dispersibility) Immediately after dispersing the ultraviolet scattering agent in the mixture of oil and dispersant, the state was visually observed and evaluated according to the following criteria. A: Uniformly dispersed B: A small amount of undispersed material is visible. C: Undispersed areas are visible

[0051] (cleanability) The oil-in-water emulsion cosmetics thus prepared were used by 10 expert panelists, who evaluated them according to the following criteria. <Evaluation criteria> A: 9 or more people rated it as good for cleaning B: 6 to 8 people rated it as good at cleaning C: 5 or fewer people rated the cleaning ability as good

[0052] The formulation and evaluation results are shown in Table 1. The commercial names of the main ingredients shown in the table are listed below. PEG-100 hydrogenated castor oil: Nikkol HCO-100FF (Nikko Chemicals) PEG-60 hydrogenated castor oil: Nikkol HCO-60 (manufactured by Nikko Chemicals) PEG-40 hydrogenated castor oil: Nikkol HCO-40 (manufactured by Nikko Chemicals) Polyglyceryl-10 stearate: S-Face S-1001P (manufactured by Sakamoto Pharmaceutical Co., Ltd.) Polyglyceryl-10 myristate: S Face M-1001 (Sakamoto Pharmaceutical Co., Ltd.) Polyglyceryl-10 laurate: SY-GlysterML-750 (manufactured by Sakamoto Pharmaceutical Co., Ltd.) Zinc oxide / dextrin palmitate: WSX-MZ-500 (manufactured by Teika Co., Ltd.) Titanium oxide / aluminum hydroxide / stearic acid: Titanium oxide ST-485SA (manufactured by Titanium Kogyo Co., Ltd.)

[0053] [Table 1]

[0054] In Examples 1 and 2 and Comparative Examples 1 and 2, the hydrophobic treatment of the UV scattering agent was changed, but as shown in Table 1, the cosmetics of Examples 1 and 2 had good cleansing properties and the UV scattering agent had good blending stability in oil-in-water systems. On the other hand, in Comparative Examples 1 and 2, the UV scattering agent was treated with a silicone system, so the cleansing properties were extremely poor.

[0055] (Examples 1, 3 to 6 and Comparative Examples 3 to 5) Oil-in-water emulsion cosmetics were prepared according to the formulations shown in Table 2 below, and the prepared cosmetics were evaluated according to the above criteria.

[0056] [Table 2]

[0057] In Examples 1, 3 to 6 and Comparative Examples 3 to 5, the type of surfactant was changed, but as shown in Table 2, Examples 1, 3 to 6, which used a nonionic surfactant with an HLB of 14 or more, all had good cleaning properties and good blending stability of the UV scattering agent into an oil-in-water system. On the other hand, in Comparative Examples 3 to 5, which used a nonionic surfactant with an HLB of less than 14, the blending stability of the UV scattering agent into an oil-in-water system was poor. Note that, since the stability of Comparative Examples 3 to 5 was poor, cleaning properties were not evaluated.

[0058] (Examples 7 to 14) Oil-in-water emulsion cosmetics were prepared according to the formulations shown in Table 3 below, and the prepared cosmetics were evaluated according to the above criteria.

[0059] [Table 3]

[0060] Examples 7 to 14 used different types of oil, but Examples 7 to 11, which used non-volatile oils with molecular weights exceeding 400, showed higher stability than Examples 8 to 14, which used oils with molecular weights of 400 or less.

[0061] (Examples 15 to 17) Oil-in-water emulsion cosmetics were prepared according to the formulations shown in Table 4 below, and the prepared cosmetics were evaluated according to the above criteria.

[0062] [Table 4]

[0063] Examples 15 to 17 used different types of dispersants, but Example 15, which used sorbitan sesquiisostearate, had higher dispersibility and stability than Example 16, in which two-thirds of the sorbitan sesquiisostearate was replaced with isostearic acid, and Example 17, in which half of the sorbitan sesquiisostearate was replaced with isostearic acid. Because of its favorable dispersibility, it also had a high SPF value. The SPF was measured by the following method.

[0064] (SPF measurement) Each cosmetic sample was applied at 2 mg / cm to a measurement plate (S plate) (5 x 5 cm V-groove PMMA plate, SPFMASTER-PA01). 2 was applied with a finger for 60 seconds, and after drying for 15 minutes, the in vitro SPF was measured using SPF MASTER (registered trademark) (manufactured by Shiseido Irika Technology Co., Ltd.).

[0065] (Examples 1 and 18) Oil-in-water emulsion cosmetics were prepared according to the formulations shown in Table 5 below, and the prepared cosmetics were evaluated according to the above criteria.

[0066] [Table 5]

[0067] In Example 18, part of the oil in the formulation of Example 1 was replaced with silicone oil. Example 18, which contained 4% by mass of silicone oil, had the same stability as Example 1, which did not contain silicone oil, but Example 1, which did not contain silicone oil, had better dispersibility. Some embodiments of the present disclosure are described in [Item 1] to [Item 8] below. [Item 1] (A) a hydrophobized ultraviolet scattering agent in an amount of 5% by mass or more relative to the total amount of the cosmetic; (B) a nonionic surfactant having an HLB value of 14 or more; (C) oil, (D) a dispersant; An oil-in-water emulsion cosmetic comprising: the hydrophobization treatment is a hydrophobization treatment using a higher fatty acid (excluding divalent metal salts of higher fatty acids) or a higher fatty acid ester, An oil-in-water emulsion cosmetic containing the ultraviolet scattering agent (A) in the internal phase. [Item 2] 2. The oil-in-water emulsion cosmetic according to item 1, wherein the (A) ultraviolet scattering agent is contained in an amount of 20 to 30% by mass relative to the total amount of the cosmetic. [Item 3] 3. The oil-in-water emulsion cosmetic according to item 1 or 2, wherein the (B) nonionic surfactant is fatty acid polyglyceryl and / or polyoxyethylene hydrogenated castor oil. [Item 4] 4. The oil-in-water emulsion cosmetic according to item 1, 2, or 3, wherein the silicone oil in the oil component (C) is less than 5% by mass with respect to the total amount of the cosmetic. [Item 5] 5. The oil-in-water emulsion cosmetic according to any one of items 1 to 4, wherein the non-volatile oil having a molecular weight exceeding 400 in the oil component (C) is 30% by mass or more of the total amount of the oil component. [Item 6] Item 6. The oil-in-water emulsion cosmetic according to Item 5, wherein the non-volatile oil having a molecular weight of more than 400 is caprylic / capric triglyceride. [Item 7] 7. The oil-in-water emulsion cosmetic according to any one of items 1 to 6, wherein the dispersant (D) contains sorbitan sesquiisostearate in an amount of 35% by mass or more based on the total amount of the dispersant. [Item 8] 8. The oil-in-water emulsion cosmetic according to any one of items 1 to 7, which does not contain an ultraviolet absorber.

Claims

1. (A) a hydrophobized ultraviolet scattering agent in an amount of 5% by mass or more relative to the total amount of the cosmetic; (B) a nonionic surfactant having an HLB of 14 or more, in an amount of 2.0 to 6.0% by mass relative to the total amount of the cosmetic; (C) oil; (D) 1.0 to 5% by mass of a dispersant relative to the total amount of the cosmetic; An oil-in-water emulsion cosmetic comprising: the hydrophobization treatment is a hydrophobization treatment using a higher fatty acid (excluding divalent metal salts of higher fatty acids) or a higher fatty acid ester, The (A) ultraviolet scattering agent is contained in the internal phase, The cosmetic contains the ultraviolet scattering agent (A) in an amount of 20 to 30% by mass relative to the total amount of the cosmetic, Does not contain UV absorbers Oil-in-water emulsion cosmetics.

2. (A) a hydrophobized ultraviolet scattering agent in an amount of 5% by mass or more relative to the total amount of the cosmetic; (B) a nonionic surfactant having an HLB of 14 or more, in an amount of 2.0 to 6.0% by mass relative to the total amount of the cosmetic; (C) oil; (D) 1.0 to 5% by mass of a dispersant relative to the total amount of the cosmetic; An oil-in-water emulsion cosmetic comprising: the hydrophobization treatment is a hydrophobization treatment using a higher fatty acid (excluding divalent metal salts of higher fatty acids) or a higher fatty acid ester, The (A) ultraviolet scattering agent is contained in the internal phase, the (B) nonionic surfactant is fatty acid polyglyceryl and / or polyoxyethylene hydrogenated castor oil, Does not contain UV absorbers Oil-in-water emulsion cosmetics.

3. (A) a hydrophobized ultraviolet scattering agent in an amount of 5% by mass or more relative to the total amount of the cosmetic; (B) a nonionic surfactant having an HLB of 14 or more, in an amount of 2.0 to 6.0% by mass relative to the total amount of the cosmetic; (C) oil; (D) 1.0 to 5% by mass of a dispersant relative to the total amount of the cosmetic; An oil-in-water emulsion cosmetic comprising: the hydrophobization treatment is a hydrophobization treatment using a higher fatty acid (excluding divalent metal salts of higher fatty acids) or a higher fatty acid ester, The (A) ultraviolet scattering agent is contained in the internal phase, the silicone oil in the (C) oil component is less than 5% by mass relative to the total amount of the cosmetic; Does not contain UV absorbers Oil-in-water emulsion cosmetics.

4. (A) a hydrophobized ultraviolet scattering agent in an amount of 5% by mass or more relative to the total amount of the cosmetic; (B) a nonionic surfactant having an HLB of 14 or more, in an amount of 2.0 to 6.0% by mass relative to the total amount of the cosmetic; (C) oil; (D) 1.0 to 5% by mass of a dispersant relative to the total amount of the cosmetic; An oil-in-water emulsion cosmetic comprising: the hydrophobization treatment is a hydrophobization treatment using a higher fatty acid (excluding divalent metal salts of higher fatty acids) or a higher fatty acid ester, The (A) ultraviolet scattering agent is contained in the internal phase, The non-volatile oil having a molecular weight exceeding 400 in the (C) oil component is 30% by mass or more of the total amount of oil component, Oil-in-water emulsion cosmetics.

5. 5. The oil-in-water emulsion cosmetic according to claim 2, wherein the ultraviolet scattering agent (A) is contained in an amount of 20 to 30% by mass relative to the total amount of the cosmetic.

6. The oil-in-water emulsion cosmetic according to any one of claims 1 and 3 to 5, wherein the nonionic surfactant (B) is a fatty acid polyglyceryl and / or polyoxyethylene hydrogenated castor oil.

7. 7. The oil-in-water emulsion cosmetic according to any one of claims 1, 2, and 4 to 6, wherein the silicone oil in the oil component (C) is less than 5 mass % of the total amount of the cosmetic.

8. The oil-in-water emulsion cosmetic according to any one of claims 1 to 3 and 5 to 7, wherein the non-volatile oil having a molecular weight exceeding 400 in the oil component (C) is 30 mass % or more of the total amount of the oil component.

9. 9. The oil-in-water emulsion cosmetic according to claim 4 or 8, wherein the non-volatile oil having a molecular weight exceeding 400 is caprylic / capric triglyceride.

10. The oil-in-water emulsion cosmetic according to any one of claims 1 to 9, wherein the dispersant (D) contains sorbitan sesquiisostearate in an amount of 35 mass% or more based on the total amount of the dispersant.

11. The oil-in-water emulsion cosmetic according to any one of claims 4 to 10, which does not contain an ultraviolet absorber.

Images