Oil-in-water emulsion cosmetics

Abstract

To provide an oil-in-water type emulsion cosmetic which has an excellent ultraviolet protection effect, has excellent emulsion stability and has good freshness and skin compatibility during application and to provide a method for producing the oil-in-water type emulsion cosmetic.SOLUTION: There are provided: an oil-in-water type emulsion cosmetic which comprises the following components (A) to (E) and has a lamellar structure; and a method for producing the oil-in-water type emulsion cosmetic. A component (A): a nonionic surfactant having an HLB of 6.0 or less, a component (B): a sucrose fatty acid ester having an HLB of more than 6.0, a component (C): a higher alcohol, a component (D): an ultraviolet absorber and a component (E): water.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an oil-in-water emulsion cosmetic having an excellent ultraviolet protection effect and a method for producing said oil-in-water emulsion cosmetic. [Background technology]

[0002] In recent years, as the importance of protection from ultraviolet rays in daily life has increased, the need for sunscreen cosmetics has also increased. In response to such market needs, oil-in-water emulsion sunscreen cosmetics, which have a refreshing feel and are easy to use over time, have been developed. These cosmetics contain ultraviolet absorbers to enhance the ultraviolet protection effect. For example, Patent Document 1 describes an oil-in-water emulsion cosmetic that contains a nonionic surfactant with an HLB of 6 or less, a sucrose fatty acid ester with an HLB of more than 6, untreated starch and / or etherified starch, a higher alcohol, an oil-soluble UV absorber, an UV absorber having a sulfonic acid group or a salt thereof, and water, for the purpose of providing an oil-in-water emulsion cosmetic that has excellent UV protection effect, good emulsion stability, and is not sticky. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-118931 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, although the oil-in-water emulsion cosmetic described in Patent Document 1 has an excellent ultraviolet protection effect, good emulsion stability, and can suppress stickiness upon application, it does not provide a sufficient fresh feeling upon application or blend well with the skin, and there is room for improvement. An object of the present invention is to provide an oil-in-water emulsion cosmetic which has an excellent ultraviolet protection effect, is excellent in emulsion stability, feels fresh when applied, and blends well with the skin, and a method for producing the oil-in-water emulsion cosmetic. [Means for solving the problem]

[0005] The present inventors have discovered that by containing a nonionic surfactant and a sucrose fatty acid ester, each having an HLB within a specified range, a higher alcohol, an ultraviolet absorber, and water, and by having a lamellar structure, it is possible to obtain an oil-in-water emulsion cosmetic that has high emulsion stability, excellent ultraviolet protection ability, a fresh feeling when applied, and good compatibility with the skin.

[0006] That is, the present invention relates to the following [1] and [2]. [1] An oil-in-water emulsion cosmetic preparation comprising the following components (A) to (E) and having a lamellar structure: Component (A): Nonionic surfactant with HLB of 6.0 or less Ingredient (B): Sucrose fatty acid ester with HLB above 6.0 Ingredient (C): Higher alcohol Component (D): UV absorber Component (E): Water [2] A method for producing an oil-in-water emulsion cosmetic composition having a lamellar structure, comprising the following components (A) to (F): Component (A): Nonionic surfactant with HLB of 6.0 or less Ingredient (B): Sucrose fatty acid ester with HLB above 6.0 Ingredient (C): Higher alcohol Component (D): UV absorber Component (E): Water Ingredient (F): Water-soluble thickener Component (D) is a combination of a water-insoluble ultraviolet absorber as component (D1) and an ultraviolet absorber having a sulfonic acid group or a salt thereof as component (D2), A method for producing an oil-in-water emulsion cosmetic, comprising the following steps 1 to 5: Step 1: Mixing and dissolving component (D2) and a portion of component (E) to obtain preparation (i) Step 2: Heating and dissolving the aqueous phase components, including component (A), component (B), and the remainder of component (E), to obtain preparation (ii). Step 3: Heating and dissolving the oil phase components including component (C) and component (D1) to obtain preparation (iii) Step 4: mixing the preparation (ii) obtained in step 2 with the preparation (iii) obtained in step 3, and emulsifying the mixture under heating to obtain preparation (iv). Step 5: A step of cooling the preparation (iv) obtained in step 4, and then adding and mixing the preparation (i) obtained in step 1 and component (F) to obtain an oil-in-water emulsion cosmetic. Effect of the Invention

[0007] The present invention can provide an oil-in-water emulsion cosmetic that has an excellent ultraviolet protection effect, is excellent in emulsion stability, feels fresh when applied, and blends well with the skin, and a method for producing the oil-in-water emulsion cosmetic. [Brief description of the drawings]

[0008] [Figure 1] 1 is a polarizing microscope photograph of the oil-in-water emulsion cosmetic of Example 2. [Diagram 2] 1 is a polarizing microscope photograph of the oil-in-water emulsion cosmetic of Comparative Example 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Oil-in-water emulsion cosmetics] The oil-in-water emulsion cosmetic of the present invention contains the following components (A) to (E) and has a lamellar structure. Component (A): Nonionic surfactant with HLB of 6.0 or less Ingredient (B): Sucrose fatty acid ester with HLB above 6.0 Ingredient (C): Higher alcohol Component (D): UV absorber Component (E): Water In the present invention, "containing component (A), component (B), component (C), component (D), and component (E)" also means "comprising a blend of component (A), component (B), component (C), component (D), and component (E)."

[0010] The present invention can provide an oil-in-water emulsion cosmetic that has an excellent ultraviolet protection effect, is excellent in emulsion stability, and has a fresh feeling and good compatibility with the skin upon application. Although the reason for this is not clear, it is thought to be as follows. The oil-in-water emulsion cosmetic of the present invention contains a nonionic surfactant and a sucrose fatty acid ester, each of which has an HLB within a specified range, as well as a higher alcohol, and is therefore capable of forming oil phase droplets covered with a coating having a lamellar structure in the aqueous phase, which is the continuous phase. Furthermore, since the oil phase droplets are covered with a coating having a strong lamellar structure, it is believed that coalescence of the oil phase droplets is suppressed, thereby improving emulsion stability. Furthermore, when the oil-in-water emulsion cosmetic of the present invention is applied to the skin, the lamellar structure of the coating that covers the oil phase droplets is maintained, and the oil phase droplets are less likely to collapse, so that a coating film containing the oil phase droplets in the aqueous phase, which is a continuous phase, can be formed on the skin surface. As a result, the aqueous phase is sufficiently retained in the coating film, which is thought to improve the UV protection effect and provide a fresh feeling and good skin compatibility when applied.

[0011] <Component (A): Nonionic surfactant with HLB of 6.0 or less> The oil-in-water emulsion cosmetic of the present invention contains a nonionic surfactant having an HLB of 6.0 or less as component (A). From the viewpoints of forming a lamellar structure, improving emulsion stability, providing a fresh feeling and good skin compatibility upon application, and enhancing the UV protection effect, component (A) is preferably an ester-type nonionic surfactant, more preferably one or more selected from the group consisting of glycerin fatty acid esters, sorbitan fatty acid esters, polyglycerin fatty acid esters, and propylene glycol fatty acid esters, even more preferably a sorbitan fatty acid ester, still more preferably one or more selected from the group consisting of sorbitan fatty acid monoesters, sorbitan fatty acid diesters, and sorbitan fatty acid triesters, and even more preferably a sorbitan fatty acid monoester.

[0012] The number of carbon atoms of the fatty acids constituting the nonionic surfactant of component (A) is preferably 8 or more and 24 or less, more preferably 12 or more and 22 or less, from the viewpoints of forming a lamellar structure, improving emulsion stability, providing a fresh feeling and good compatibility with the skin upon application, and enhancing the UV protection effect. Examples of fatty acids constituting the nonionic surfactant of component (A) include saturated fatty acids such as palmitic acid and stearic acid; and unsaturated fatty acids such as oleic acid and elaidic acid.

[0013] From the viewpoints of forming a lamellar structure, improving emulsion stability, providing a fresh feeling and good compatibility with the skin upon application, and enhancing the UV protection effect, the HLB of component (A) is 6.0 or less, preferably 5.5 or less, more preferably 5.0 or less, and is preferably 3.0 or more, more preferably 3.5 or more, and even more preferably 4.0 or more. Here, the HLB (hydrophile-lipophile balance) of component (A) is an index that represents the ratio of the relative affinity of a surfactant for both liquids in an oil-water system, and can be calculated from the following formula using the Griffin method (J. Soc. Cosm. Chem., 1954, 5:249-256). HLB = 20 x [(molecular weight of hydrophilic group contained in surfactant) / (molecular weight of surfactant)] Examples of the hydrophilic group contained in the surfactant include a hydroxyl group and an ethyleneoxy group.

[0014] Specific examples of component (A) include glyceryl myristate (HLB: 3.5), glyceryl monostearate (HLB: 4.0), glyceryl isostearate (HLB: 4.0), glyceryl oleate (HLB: 2.5), sorbitan monostearate (HLB: 4.7), sorbitan monooleate (HLB: 4.3), sorbitan monoisostearate (HLB: 5.0), sorbitan tristearate (HLB: 2.1), sorbitan trioleate (HLB: 1.7), diisostearate (HLB: 2.2), and glyceryl oleate (HLB: 2.2). Examples of such fatty acids include glyceryl (HLB: 5.0), diglyceryl monooleate (HLB: 5.5), diglyceryl isostearate (HLB: 5.5), tetraglyceryl monostearate (HLB: 6.0), hexaglyceryl tristearate (HLB: 2.5), decaglyceryl pentastearate (HLB: 3.5), decaglyceryl pentaisostearate (HLB: 3.5), decaglyceryl pentaoleate (HLB: 3.5), and propylene glycol monostearate (HLB: 3.5). The component (A) may be contained as one type alone or as a combination of two or more types.

[0015] Among these, from the viewpoints of forming a lamellar structure, improving emulsion stability, improving moisture and skin compatibility upon application, and enhancing the UV protection effect, component (A) is preferably glyceryl myristate, glyceryl monostearate, glyceryl isostearate, sorbitan monostearate, sorbitan monooleate, sorbitan monoisostearate, diglyceryl monostearate, diglyceryl monooleate, diglyceryl isostearate, decaglyceryl pentastearate, decaglyceryl pentaisostearate, decaglyceryl pentaoleate, decaglyceryl pentaoleate, or decaglyceryl pentaoleate. The monomer unit is preferably one or more selected from the group consisting of glyceryl monostearate, glyceryl isostearate, sorbitan monostearate, sorbitan monooleate, sorbitan monoisostearate, and diglyceryl monostearate, more preferably one or more selected from the group consisting of sorbitan monostearate, sorbitan monooleate, and sorbitan monoisostearate, and even more preferably sorbitan monostearate. Commercially available products of component (A) include the Rheodol series manufactured by Kao Corporation. Component (A) may also be produced by known methods.

[0016] The content of component (A) in the oil-in-water emulsion cosmetic of the present invention is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.3% by mass or more, even more preferably 0.7% by mass or more, even more preferably 1% by mass or more, and is preferably 6% by mass or less, more preferably 5% by mass or less, even more preferably 4% by mass or less, even more preferably 3% by mass or less, even more preferably 2% by mass or less, from the viewpoints of forming a lamellar structure, improving emulsion stability, improving freshness and skin compatibility upon application, and enhancing UV protection effect. More specifically, it is preferably 0.1 to 6% by mass, more preferably 0.2 to 5% by mass, even more preferably 0.3 to 4% by mass, even more preferably 0.7 to 3% by mass, even more preferably 1 to 3% by mass, and even more preferably 1 to 2% by mass.

[0017] <Component (B): Sucrose fatty acid ester with HLB above 6.0> The oil-in-water emulsion cosmetic of the present invention contains, as component (B), a sucrose fatty acid ester having an HLB value of more than 6.0. Component (B) is not particularly limited as long as it is a sucrose fatty acid ester that is generally used as a food or cosmetic raw material, but is preferably a sucrose fatty acid ester having an average fatty acid substitution degree of 2 or more. A sucrose fatty acid ester having a substitution degree of 2 or more is an ester in which two or more hydrogen atoms of the hydroxyl groups of sucrose are substituted with fatty acid acyl groups, and from the viewpoints of improving emulsion stability, improving freshness and compatibility with the skin upon application, and enhancing ultraviolet protection effect, it is more preferably a sucrose fatty acid ester having an average fatty acid substitution degree of 2 or more and 6 or less.

[0018] The HLB of component (B) is more than 6.0, from the viewpoints of forming a lamellar structure, improving emulsion stability, improving the fresh feeling and affinity with the skin upon application, and enhancing the UV protection effect, and is preferably 8.0 or more, more preferably 10.0 or more, even more preferably 12.0 or more, still more preferably 14.0 or more, and is preferably 20.0 or less, more preferably 18.0 or less, and even more preferably 17.0 or less. Here, the HLB of the component (B) can be determined from the above formula by the Griffin method, as described above.

[0019] The number of carbon atoms of the fatty acids constituting the sucrose fatty acid ester of component (B) is preferably 8 or more, more preferably 10 or more, even more preferably 12 or more, from the viewpoints of forming a lamellar structure, improving emulsion stability, providing a fresh feeling and good skin compatibility upon application, and enhancing the UV protection effect, and is preferably 20 or less, more preferably 18 or less, even more preferably 16 or less.

[0020] Specific examples of component (B) include sucrose caprylate, sucrose caprate, sucrose laurate, sucrose myristate, sucrose palmitate, sucrose stearate, and sucrose oleate. The component (B) may be contained as one type alone or as a combination of two or more types.

[0021] Among these, from the viewpoints of forming a lamellar structure, improving emulsion stability, providing a fresh feeling and good skin compatibility upon application, and enhancing UV protection effect, component (B) preferably contains one or more types selected from the group consisting of sucrose laurate, sucrose myristate, sucrose palmitate, and sucrose stearate, more preferably contains one or more types selected from the group consisting of sucrose laurate, sucrose myristate, and sucrose palmitate, and even more preferably contains one or more types selected from the group consisting of sucrose laurate and sucrose myristate. When component (B) contains one or more members selected from the group consisting of sucrose laurate and sucrose myristate, the total content of sucrose laurate and sucrose myristate in component (B) is preferably 50% by mass or more, more preferably 55% by mass or more, and even more preferably 60% by mass or more. Furthermore, from the viewpoints of forming a lamellar structure, improving emulsion stability, providing a fresh feeling and good compatibility with the skin upon application, and enhancing the ultraviolet protection effect, component (B) is preferably composed of naturally occurring fatty acids such as coconut oil, palm oil, palm kernel oil, etc., and is more preferably a coconut oil fatty acid sucrose ester. Commercially available products of component (B) include "Ryoto Sugar Ester L-1695", "Ryoto Sugar Ester M-1695", "Ryoto Sugar Ester P-1570", "Ryoto Sugar Ester P-1670", "Ryoto Sugar Ester S-1570", "Ryoto Sugar Ester S-1670", and "Ryoto Sugar Ester O-1570" (all manufactured by Mitsubishi Chemical Foods Corporation).

[0022] The content of component (B) in the oil-in-water emulsion cosmetic of the present invention is preferably 0.01% by mass or more, more preferably 0.03% by mass or more, even more preferably 0.07% by mass or more, even more preferably 0.1% by mass or more, and is preferably 1.5% by mass or less, more preferably 1% by mass or less, even more preferably 0.7% by mass or less, even more preferably 0.5% by mass or less, even more preferably 0.3% by mass or less, from the viewpoints of forming a lamellar structure, improving emulsion stability, improving moisture and skin compatibility upon application, and enhancing UV protection effect. More specifically, it is preferably 0.01 to 1.5% by mass, more preferably 0.03 to 1% by mass, even more preferably 0.07 to 0.7% by mass, even more preferably 0.1 to 0.5% by mass, and even more preferably 0.1 to 0.3% by mass.

[0023] In the present invention, a nonionic surfactant other than components (A) and (B) may be contained, but the combined HLB of the nonionic surfactants including components (A) and (B) is preferably 3.0 or more, more preferably 4.0 or more, even more preferably 5.0 or more, from the viewpoints of forming a lamellar structure, improving emulsion stability, improving the fresh feeling and affinity with the skin upon application, and enhancing the UV protection effect, and is preferably 12.0 or less, more preferably 9.0 or less, even more preferably 7.0 or less. Here, the mixed HLB is a weighted average of the HLB of each nonionic surfactant based on the mass ratio of the surfactants contained therein, and is calculated by the following formula. Mixed HLB=Σ(HLBx×Wx) / ΣWx (HLBx indicates the HLB of nonionic surfactant X. Wx indicates the mass (g) of nonionic surfactant X.)

[0024] The total content of component (A) and component (B) in the oil-in-water emulsion cosmetic of the present invention is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.3% by mass or more, even more preferably 0.7% by mass or more, even more preferably 1% by mass or more, and is preferably 6% by mass or less, more preferably 5% by mass or less, even more preferably 4% by mass or less, even more preferably 3% by mass or less, from the viewpoints of forming a lamellar structure, improving emulsion stability, improving freshness and skin compatibility upon application, and enhancing UV protection effect. More specifically, it is preferably 0.1 to 6% by mass, more preferably 0.2 to 5% by mass, even more preferably 0.3 to 4% by mass, even more preferably 0.7 to 3% by mass, even more preferably 1 to 3% by mass.

[0025] The mass ratio [(A) / (B)] of the content of component (A) to the content of component (B) in the oil-in-water emulsion cosmetic of the present invention is preferably 0.5 or more, more preferably 2.0 or more, even more preferably 5.0 or more, even more preferably 7.0 or more, from the viewpoint of forming a lamellar structure, improving emulsion stability, improving freshness and skin compatibility upon application, and enhancing ultraviolet protection effect, and is also preferably 20.0 or less, more preferably 16.0 or less, even more preferably 14.0 or less, even more preferably 12.0 or less, even more preferably 11.0 or less. More specifically, it is preferably 0.5 to 20.0, more preferably 2.0 to 16.0, even more preferably 5.0 to 14.0, even more preferably 7.0 to 12.0, even more preferably 7.0 to 11.0.

[0026] <Component (C): Higher alcohol> The oil-in-water emulsion cosmetic of the present invention contains a higher alcohol as component (C). The number of carbon atoms of the higher alcohol which is component (C) is preferably 10 or more and 24 or less, more preferably 12 or more and 24 or less, even more preferably 14 or more and 24 or less, and still more preferably 20 or more and 24 or less, from the viewpoints of forming a lamellar structure, improving emulsion stability, improving the fresh feeling and affinity with the skin upon application, and enhancing the UV protection effect. Component (C) may be either linear or branched, and may be either saturated or unsaturated, but from the same viewpoints as above, it is preferably a linear or branched saturated higher alcohol, and more preferably a linear saturated higher alcohol.

[0027] Specific examples of component (C) include myristyl alcohol, cetyl alcohol, stearyl alcohol, isostearyl alcohol, arachidyl alcohol, behenyl alcohol, carnaubinyl alcohol, and oleyl alcohol. The component (C) may be contained as one type alone or as a combination of two or more types.

[0028] Among these, from the viewpoints of forming a lamellar structure and achieving a fresh feeling and good skin compatibility upon application, component (C) is preferably one or more selected from the group consisting of cetyl alcohol, stearyl alcohol, arachyl alcohol, and behenyl alcohol, more preferably one or more selected from the group consisting of cetyl alcohol, stearyl alcohol, and behenyl alcohol, and even more preferably behenyl alcohol.

[0029] The content of component (C) in the oil-in-water emulsion cosmetic of the present invention is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.3% by mass or more, even more preferably 0.7% by mass or more, even more preferably 1% by mass or more, even more preferably 2% by mass or more, and is preferably 15% by mass or less, more preferably 13% by mass or less, even more preferably 10% by mass or less, even more preferably 8% by mass or less, even more preferably 6% by mass or less, even more preferably 4% by mass or less, from the viewpoint of forming a lamellar structure, improving emulsion stability, improving freshness and skin compatibility upon application, and enhancing UV protection effect. More specifically, it is preferably 0.05 to 15% by mass, more preferably 0.1 to 13% by mass, even more preferably 0.3 to 10% by mass, even more preferably 0.7 to 8% by mass, even more preferably 1 to 6% by mass, even more preferably 2 to 4% by mass.

[0030] The mass ratio of the content of component (C) to the total content of components (A) and (B) in the oil-in-water emulsion cosmetic of the present invention [(C) / [(A)+(B)]] is preferably 0.3 or more, more preferably 0.5 or more, even more preferably 0.7 or more, even more preferably 1.0 or more, even more preferably 1.3 or more, and is preferably 6.0 or less, more preferably 5.0 or less, even more preferably 4.0 or less, even more preferably 3.0 or less, even more preferably 2.0 or less, even more preferably 1.7 or less, from the viewpoint of forming a lamellar structure, improving emulsion stability, improving freshness and skin compatibility upon application, and enhancing ultraviolet protection effect. More specifically, it is preferably 0.3 to 6.0, more preferably 0.5 to 5.0, even more preferably 0.7 to 4.0, even more preferably 1.0 to 3.0, even more preferably 1.3 to 2.0, even more preferably 1.3 to 1.7.

[0031] <Component (D): UV absorber> The oil-in-water emulsion cosmetic of the present invention contains an ultraviolet absorbing agent as component (D) in order to improve the ultraviolet protection effect. Examples of component (D) include those typically used in cosmetics, and among these, one or more selected from the group consisting of the following components (D1) and (D2) are preferred. Ingredient (D1): Non-water-soluble UV absorber Component (D2): UV absorber having a sulfonic acid group or its salt In the present invention, the term "water-insoluble" refers to a solubility in water of 1 w / w % or less.

[0032] [Component (D1): Water-insoluble UV absorber] Examples of the component (D1) include water-insoluble organic ultraviolet absorbers, such as cinnamic acid-based ultraviolet absorbers, triazine-based ultraviolet absorbers, benzoylmethane-based ultraviolet absorbers, salicylic acid-based ultraviolet absorbers, para-aminobenzoic acid-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, and other organic ultraviolet absorbers.

[0033] Examples of water-insoluble cinnamic acid-based ultraviolet absorbers include 2-ethylhexyl paramethoxycinnamate (e.g., "UVINUL MC80" manufactured by BASF), glyceryl di-paramethoxycinnamate mono-2-ethylhexanoate, methyl 2,5-diisopropylcinnamate, 2-ethoxyethyl paramethoxycinnamate, methyl bis(trimethylsiloxy)silylisopentyl trimethoxycinnamate, and a mixture of isopropyl paramethoxycinnamate and diisopropyl cinnamate.

[0034] Examples of water-insoluble triazine-based ultraviolet absorbers include 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine (hereinafter also referred to as "ethylhexyltriazone"; for example, "UVINUL T-150" manufactured by BASF), bis(ethylhexyloxyphenol)methoxyphenyltriazine (for example, "TINOSORB S" manufactured by BASF), and the like. Examples of the water-insoluble benzoylmethane ultraviolet absorbers include 4-isopropyldibenzoylmethane and 4-tert-butyl-4'-methoxydibenzoylmethane (for example, "PARSOL 1789" manufactured by DSM).

[0035] Examples of water-insoluble salicylic acid-based ultraviolet absorbers include ethylene glycol salicylate, 2-ethylhexyl salicylate (e.g., "PARSOL EHS" manufactured by DSM), butyloctyl salicylate, benzyl salicylate, and homomenthyl salicylate (homosalate, e.g., "PARSOL HMS" manufactured by DSM). Examples of the water-insoluble para-aminobenzoic acid-based ultraviolet absorbers include para-aminobenzoic acid, ethyldihydroxypropylpara-aminobenzoate, octyldimethylpara-aminobenzoate, amyl para-dimethylaminobenzoate, 2-ethylhexyl para-dimethylaminobenzoate, and glyceryl para-aminobenzoate.

[0036] Examples of the water-insoluble benzophenone ultraviolet absorbers include 4-(2-β-glucopyranosyloxy)propoxy-2-hydroxybenzophenone, dihydroxydimethoxybenzophenone, dihydroxydimethoxybenzophenone sodium disulfonate, 2-hydroxy-4-methoxybenzophenone (e.g., "UVINUL M40" manufactured by BASG), 2-hydroxy-4-methoxybenzophenone-5-sulfuric acid, 2,2'-dihydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, and 2-hydroxy-4-N-octoxybenzophenone.

[0037] Other water-insoluble UV absorbers include octocrylene (e.g., DSM's "PARSOL 340"); diethylaminohydroxybenzoylhexylbenzoate (e.g., BASF's "UVINUL A PLUS GRANULAR"); dimethicodiethylbenzalmalonate (polysilicone-15, e.g., DSM's "PARSOL SLX"); dimethoxybenzylidene dioxoimidazolidinepropionate 2-ethylhexyl (e.g., Ajinomoto Co.'s "Soft Shade DH"); copolymers of adipic acid and neopentyl glycol, the ends of which are blocked with octyldodecanol or cyanodiphenylpropenoic acid (polyester-8, Hall Chemical Industries, Ltd.); "Polycrylene" manufactured by Star; 1-(3,4-dimethoxyphenyl)-4,4-dimethyl-1,3-pentanedione; cinoxate; methyl-o-aminobenzoate, 3-(4-methylbenzylidene) camphor; methylene bisbenzotriazolyl tetramethylbutylphenol (for example, "TINOSORB M" manufactured by BASF); drometrizole trisiloxane, and the like. The component (D1) may be contained as one type alone or as a combination of two or more types.

[0038] Among these, component (D1) preferably contains one or more selected from the group consisting of water-insoluble cinnamic acid-based UV absorbers, water-insoluble triazine-based UV absorbers, and water-insoluble benzoylmethane-based UV absorbers, more preferably contains one or more selected from the group consisting of 2-ethylhexyl paramethoxycinnamate, ethylhexyl triazone, bis(ethylhexyloxyphenol) methoxyphenyl triazine, 4-tert-4'-butylmethoxydibenzoylmethane, octocrylene, diethylaminohydroxybenzoyl hexyl benzoate, polysilicone-15, and drometrizole trisiloxane, and even more preferably contains one or more selected from the group consisting of 2-ethylhexyl paramethoxycinnamate, ethylhexyl triazone, bis(ethylhexyloxyphenol) methoxyphenyl triazine, 4-tert-4'-butylmethoxydibenzoylmethane, and diethylaminohydroxybenzoyl hexyl benzoate.

[0039] From the viewpoint of improving the ultraviolet protection effect, the content of component (D1) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 0.5% by mass or more, more preferably 1% by mass or more, even more preferably 3% by mass or more, even more preferably 5% by mass or more, even more preferably 7% by mass or more, and preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 13% by mass or less, even more preferably 11% by mass or less. More specifically, it is preferably 0.5 to 20% by mass, more preferably 1 to 15% by mass, even more preferably 3 to 15% by mass, even more preferably 5 to 15% by mass, even more preferably 5 to 13% by mass, even more preferably 7 to 11% by mass.

[0040] [Component (D2): UV absorber having a sulfonic acid group or its salt] Specific examples of the component (D2) include ultraviolet absorbers having a sulfonic acid group, such as hydroxymethoxybenzophenone sulfonic acid (e.g., "UVINUL MS40" manufactured by BASF), phenylbenzimidazole sulfonic acid (e.g., "EUSOLEX 232" manufactured by Merck, and "Neo Heliopan Hydro" manufactured by Symrise), phenyldibenzimidazole tetrasulfonic acid (e.g., "Neo Heliopan AP" manufactured by Symrise), and terephthalidenedicamphor sulfonic acid (e.g., "Solfilter-TDSA-H" manufactured by Chirochem).

[0041] Although an ultraviolet absorber having a sulfonic acid group is an ultraviolet absorber that has low solubility in water when not neutralized, it becomes highly water-soluble when neutralized with a basic compound to form a salt. From this viewpoint, it is preferable to use a salt of an ultraviolet absorber having a sulfonic acid group as component (D2). The basic compound is an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide. metal hydroxides of Group 2 elements such as calcium hydroxide and magnesium hydroxide; organic amines such as triethanolamine, monoethanolamine, triethylamine, aminomethylpropanol, and trishydroxymethylaminomethane (tromethamine); ammonia; and basic amino acids such as arginine and lysine. Examples of salts of ultraviolet absorbents having a sulfonic acid group include alkali metal salts such as sodium salts and potassium salts; metal salts of Group 2 elements such as calcium salts and magnesium salts; organic amine salts such as triethanolamine salts, monoethanolamine salts, triethylamine salts, aminomethylpropanol salts and trishydroxymethylaminomethane (tromethamine) salts; ammonium salts; and basic amino acid salts such as arginine salts and lysine salts.

[0042] Among these, from the viewpoints of commercial availability, biological safety, and obtaining a good UV protection effect, component (D2) preferably contains one or more selected from the group consisting of phenylbenzimidazole sulfonic acid, terephthalylidene dicamphor sulfonic acid, and salts thereof, more preferably contains one or more salts selected from the group consisting of phenylbenzimidazole sulfonic acid and terephthalylidene dicamphor sulfonic acid, even more preferably contains one or more alkali metal salts or organic amine salts selected from the group consisting of phenylbenzimidazole sulfonic acid and terephthalylidene dicamphor sulfonic acid, still more preferably contains one or more organic amine salts selected from the group consisting of phenylbenzimidazole sulfonic acid and terephthalylidene dicamphor sulfonic acid, and even more preferably contains one or more triethanolamine salts selected from the group consisting of phenylbenzimidazole sulfonic acid and terephthalylidene dicamphor sulfonic acid. The oil-in-water emulsion cosmetic of the present invention may contain an ultraviolet absorber having a sulfonic acid group and a basic compound as component (D2) to form a salt in the oil-in-water emulsion cosmetic.

[0043] The content of component (D2) in the oil-in-water emulsion cosmetic of the present invention (content as unneutralized amount) is, from the viewpoint of improving the UV protection effect, preferably 0.3% by mass or more, more preferably 1% by mass or more, even more preferably 1.5% by mass or more, still more preferably 2% by mass or more, and is preferably 10% by mass or less, more preferably 8% by mass or less, even more preferably 6% by mass or less, still more preferably 4% by mass or less. More specifically, it is preferably 0.3 to 10% by mass, more preferably 1 to 8% by mass, even more preferably 1.5 to 6% by mass, and still more preferably 2 to 4% by mass.

[0044] From the viewpoints of providing a fresh feeling and good compatibility with the skin upon application and enhancing the ultraviolet protection effect, it is preferable that component (D) is a combination of component (D1) and component (D2). When component (D1) and component (D2) are used in combination, the total content of component (D1) and component (D2) in the oil-in-water emulsion cosmetic of the present invention is preferably 1% by mass or more, more preferably 2% by mass or more, even more preferably 3% by mass or more, still more preferably 5% by mass or more, even more preferably 10% by mass or more, and preferably 30% by mass or less, more preferably 20% by mass or less, even more preferably 17% by mass or less, even more preferably 15% by mass or less. More specifically, it is preferably 1 to 30% by mass, more preferably 2 to 20% by mass, even more preferably 3 to 17% by mass, even more preferably 5 to 15% by mass, even more preferably 10 to 15% by mass. The mass ratio [(D1) / (D2)] of the content of component (D1) to the content of component (D2) (content as unneutralized amount) in the oil-in-water emulsion cosmetic of the present invention is, from the viewpoint of improving the ultraviolet protection effect, preferably 1.0 or more, more preferably 1.5 or more, even more preferably 2.0 or more, and is preferably 10.0 or less, more preferably 7.0 or less, even more preferably 5.0 or less. More specifically, it is preferably 1.0 to 10.0, more preferably 1.5 to 7.0, even more preferably 2.0 to 5.0.

[0045] <Component (E): Water> The oil-in-water emulsion cosmetic of the present invention contains water as component (E). The water content in the oil-in-water emulsion cosmetic of the present invention is, from the viewpoint of achieving a fresh feeling and good skin compatibility upon application, preferably 40% by mass or more, more preferably 45% by mass or more, even more preferably 50% by mass or more, even more preferably 55% by mass or more, even more preferably 60% by mass or more, and preferably 90% by mass or less, more preferably 85% by mass or less, even more preferably 80% by mass or less, and even more preferably 75% by mass or less. More specifically, it is preferably 40 to 90% by mass, more preferably 45 to 85% by mass, even more preferably 50 to 80% by mass, even more preferably 55 to 75% by mass, and even more preferably 60 to 75% by mass.

[0046] In addition to components (A) to (E), the oil-in-water emulsion cosmetic of the present invention may contain optional components used according to the intended use of the cosmetic, as appropriate, to the extent that the effects of the present invention are not impaired. Examples of such optional components include surfactants, water-soluble polymers, oils, neutralizing agents, pH adjusters, bactericides, anti-inflammatory agents, preservatives, colorants, chelating agents, whitening agents, antiperspirants, insect repellents, bioactive ingredients, salts, antioxidants, fragrances, etc., other than components (A) to (E). In the present invention, the aqueous medium may further contain, as an aqueous medium other than the component (E), a saturated monohydric alcohol having 1 to 3 carbon atoms, such as ethanol, propyl alcohol, or isopropyl alcohol.

[0047] <Component (F): Water-soluble thickener> From the viewpoint of obtaining good emulsion stability, the oil-in-water emulsion cosmetic of the present invention preferably further contains a water-soluble thickener as component (F). Component (F) is preferably a water-soluble polymer having a thickening effect, and is not limited as long as it is one that is commonly used in cosmetics, and any of natural polymers, semi-synthetic polymers, and synthetic polymers can be used. Examples of natural polymers include xanthan gum, carrageenan, and alginic acid. Among these, xanthan gum is preferred from the viewpoint of obtaining good emulsion stability. Examples of the semi-synthetic polymer include modified polysaccharides such as hydroxycellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, sodium carboxymethyl cellulose, methyl cellulose, hydroxymethyl cellulose, and cationic cellulose. Among these, hydroxyethyl cellulose is preferred from the viewpoint of obtaining good emulsion stability. Examples of synthetic polymers include crosslinked polyacrylic acid (carbomer, carboxyvinyl polymer), polyacrylic acid, (acrylic acid / alkyl methacrylate) copolymers and salts thereof, vinyl polymers containing structural units derived from (meth)acrylic acid or structural units derived from (meth)acrylic acid derivatives, such as polyacrylic acid amide; polyvinylpyrrolidone, polyvinyl alcohol, and cationized polyvinylpyrrolidone. Among these, from the viewpoint of obtaining good emulsion stability, component (F) is preferably one or more selected from the group consisting of natural polymers, semi-synthetic polymers, and synthetic polymers, more preferably one or more selected from the group consisting of xanthan gum, hydroxyethyl cellulose, and vinyl polymers containing a structural unit derived from (meth)acrylic acid or a structural unit derived from a (meth)acrylic acid derivative, and even more preferably contains a vinyl polymer containing a structural unit derived from (meth)acrylic acid or a structural unit derived from a (meth)acrylic acid derivative, and from the viewpoint of obtaining a fresh feeling upon application and good compatibility with the skin, contains a crosslinked polyacrylic acid (carbomer, carboxyvinyl polymer).

[0048] Commercially available hydroxyethyl cellulose products include "HEC Daicel SE400", "HEC SE550", "HEC SE600", "HEC SE850", and "HEC Daicel SE900" (all from Daicel Miraize Co., Ltd.). Commercially available carbomer products include "Carbopol 910," "Carbopol 934," "Carbopol 940," "Carbopol 941," "Carbopol 980," and "Carbopol 981" (all manufactured by Lubrizol Advanced Materials). Commercially available polyacrylic acid amide products include "SEPIGEL305" (manufactured by SEPPIC). Commercially available products of (acrylic acid / alkyl methacrylate) copolymers include "Carbopol 1382", "Carbopol ETD2020", "PEMULEN TR-1", and "PEMULEN TR-2" (all manufactured by Lubrizol Advanced Materials).

[0049] The content of component (F) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 0.01% by mass or more, more preferably 0.03% by mass or more, even more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more from the viewpoint of obtaining good emulsion stability, and is preferably 1% by mass or less, more preferably 0.7% by mass or less, even more preferably 0.5% by mass or less, and even more preferably 0.4% by mass or less from the viewpoint of obtaining good moisture and skin compatibility upon application. More specifically, it is preferably 0.01 to 1.0% by mass, more preferably 0.03 to 0.7% by mass, even more preferably 0.05 to 0.5% by mass, and even more preferably 0.1 to 0.4% by mass. When component (F) contains a crosslinked polyacrylic acid (carbomer, carboxyvinyl polymer), the content of the crosslinked polyacrylic acid (carbomer, carboxyvinyl polymer) in component (F) is preferably 50% by mass or more, more preferably 55% by mass or more, even more preferably 60% by mass or more, and still more preferably 65% ​​by mass or more.

[0050] <Component (G): Oil> From the viewpoint of improving emulsion stability, the oil-in-water emulsion cosmetic of the present invention preferably further contains a liquid oil as component (G). Component (G) is an oil agent that has fluidity under an atmosphere of 1 atmosphere and 25°C. As the component (G), preferably, one or more types selected from the group consisting of ester oils, silicone oils, hydrocarbon oils, and higher fatty acids are used. The component (G) may be contained as one type alone or as a combination of two or more types.

[0051] Examples of the ester oil include synthetic ester oils and natural fats and oils, such as esters of monovalent carboxylic acids and monovalent alcohols, esters of monovalent carboxylic acids and polyvalent alcohols, and esters of polyvalent carboxylic acids and monovalent alcohols.

[0052] Examples of the ester of a monovalent carboxylic acid and a monohydric alcohol include the ester represented by the following general formula (1). R1 -COO-R 2 (1) In the general formula (1), R 1 represents a linear or branched alkyl or alkenyl group having 1 to 25 carbon atoms, which may be substituted with a hydroxyl group, or an aromatic hydrocarbon group having 6 to 24 carbon atoms, R 2 represents a linear or branched alkyl or alkenyl group having 1 to 30 carbon atoms.

[0053] R 1 When is an alkyl group or an alkenyl group, it preferably has 7 or more carbon atoms and preferably has 23 or less, more preferably 21 or less, even more preferably 19 or less, and still more preferably 17 or less. R 1 When is an aromatic hydrocarbon group, the number of carbon atoms is preferably 6 or more and preferably 22 or less, more preferably 20 or less. R 2 The number of carbon atoms is preferably 2 or more, and is preferably 28 or less, more preferably 24 or less, and further preferably 20 or less.

[0054] Specific examples of the ester represented by the general formula (1) include cetyl isooctanoate, stearyl isooctanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isostearyl laurate, butyl myristate, isopropyl myristate, decyl myristate, isotridecyl myristate, isocetyl myristate, isostearyl myristate, 2-octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, and isostearyl palmitate. Examples of the alkyl esters include one or more selected from the group consisting of allyl, 2-hexyldecyl palmitate, 2-ethylhexyl stearate, 2-hexyldecyl stearate, isopropyl isostearate, 2-hexyldecyl isostearate, ethyl oleate, isodecyl oleate, oleyl oleate, octyldodecyl oleate, ethyl linoleate, isopropyl linoleate, lanolin acetate, methyl castor oil fatty acid (methyl ricinoleate), and alkyl benzoate (alkyl having 12 to 15 carbon atoms).

[0055] Examples of the ester of a monovalent carboxylic acid and a monohydric alcohol include an ester represented by the following general formula (2). R 3 -COO-(AO) n -R 4 (2) In the general formula (2), R 3 represents a linear or branched alkyl or alkenyl group having 1 to 25 carbon atoms, which may be substituted with a hydroxyl group; R 4 represents an aromatic hydrocarbon group having 6 to 24 carbon atoms, AO represents an alkyleneoxy group having 2 to 4 carbon atoms, and n represents the average number of moles added of 1 to 50. R 3 is preferably an alkyl group having 7 or more carbon atoms and preferably 23 or less, more preferably 21 or less, and even more preferably 19 or less. R 4 is preferably an aromatic-containing hydrocarbon group having 6 or more carbon atoms and preferably 22 or less, more preferably 20 or less, even more preferably 18 or less, and still more preferably a benzyl group. The AO group is preferably a propyleneoxy group, and n is preferably 1 or more and 10 or less, more preferably 1 or more and 5 or less. Specific examples of the ester represented by general formula (2) include an ester of myristic acid and a 3-mol propylene oxide adduct of benzyl alcohol (Croda: Crodamol STS), and an ester of 2-ethylhexanoic acid and a 3-mol propylene oxide adduct of benzyl alcohol (Croda: Crodamol SFX).

[0056] Examples of the ester of a monovalent carboxylic acid and a polyhydric alcohol include the ester represented by the following general formula (3). R 5 -(OCOR 6 ) p (3) In the general formula (3), R 5 represents a polyhydric alcohol residue, preferably a hydrocarbon group having 2 to 10 carbon atoms; R 6 represents a monovalent carboxylic acid residue having 1 to 25 carbon atoms, and p represents an integer of 2 to 10. In addition, R 5 may have an ether bond, but is preferably a linear or branched hydrocarbon group having from 2 to 10 carbon atoms. Also, p is the same number as the number of hydroxy groups in the polyhydric alcohol. R 6 is preferably an alkyl group having 7 or more carbon atoms, and from the same viewpoint as above, preferably 23 or less, more preferably 21 or less, and even more preferably 19 or less.

[0057] Examples of the ester represented by general formula (3) include propylene glycol dicaprate, propylene glycol dioleate, neopentyl glycol dicaprate, neopentyl glycol di-2-ethylhexanoate, di(caprylic / capric)propanediol, propanediol diisostearate, ethylene glycol di-2-ethylhexanoate, tri(caprylic / capric)glyceryl, tri-2-ethylhexyl glyceryl, tri-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexylate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, and natural fats and oils. Examples of natural fats and oils include triglycerides such as avocado oil, olive oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed oil, castor oil, cottonseed oil, and mink oil.

[0058] Examples of the esters of polyvalent carboxylic acids and monohydric alcohols include esters represented by the following general formula (4). R 7 -(COOR 8 ) q (4) In the general formula (4), R 7 is a polycarboxylic acid residue having 2 to 10 carbon atoms, and R 8 represents a monohydric alcohol residue having 1 to 25 carbon atoms, and q is an integer of 2 to 10. In addition, q is the same number as the number of carboxy groups possessed by the polyvalent carboxylic acid. R 8 is preferably 3 or more, and from the same viewpoint as above, is preferably 23 or less, more preferably 21 or less, and further preferably 19 or less. Specific examples include diisostearyl malate, di-2-ethylhexyl succinate, diisobutyl adipate, di-2-heptylundecyl adipate, di-2-ethylhexyl sebacate, diisopropyl sebacate, and tri-2-ethylhexyl trimellitate.

[0059] Among these, from the viewpoint of improving emulsion stability, the ester oil is preferably an ester represented by general formula (1), general formula (3) or general formula (4), and more preferably a monoester of a linear or branched fatty acid having from 8 to 18 carbon atoms and a linear or branched monohydric alcohol having from 2 to 24 carbon atoms, a triester of a branched fatty acid having from 6 to 18 carbon atoms and glycerin, a tetraester of a branched fatty acid having from 6 to 18 carbon atoms and pentaerythritol, a triester of a branched monohydric alcohol having from 6 to 18 carbon atoms and trimellitic acid, and an alkyl benzoate (C12-15) (for example, "Finsorb TN" (Innospec Active Chemicals) Preferably, the ester is at least one selected from the group consisting of cetyl 2-ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, octyldodecyl myristate, isopropyl palmitate, glyceryl tri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, diisopropyl sebacate, tri-2-ethylhexyl trimellitate, and alkyl benzoate (C12-15).

[0060] From the viewpoint of improving emulsion stability, the silicone oil is preferably at least one selected from the group consisting of dimethyl silicone and modified silicone, more preferably at least one selected from the group consisting of dimethylpolysiloxane and phenyl-modified silicone, and even more preferably at least one selected from the group consisting of dimethylpolysiloxane and phenyl-modified silicone, and further preferably at least one having a kinetic viscosity of 5,000 mm at 25° C. 2 The silicone oil is at least one selected from the group consisting of dimethylpolysiloxane and phenyl-modified silicone having a viscosity of not more than 1 / s. Examples of phenyl-modified silicones include phenyl trimethicone, diphenyl dimethicone, diphenylsiloxyphenyl trimethicone, and phenyl methicone. The kinetic viscosity of the silicone oil at 25° C. can be measured by an Ubbelohde viscometer in accordance with ASTM D 445-46T or JIS Z 8803. Commercially available silicone oils include "KF-96A-6cs" (dimethylpolysiloxane), "KF-96A-10cs" (dimethylpolysiloxane), "KF-96A-20cs" (dimethylpolysiloxane), and "KF-96A-100cs" (dimethylpolysiloxane) manufactured by Shin-Etsu Chemical Co., Ltd.; "DOWSIL SH 556 Fluid" (phenyl trimethicone) manufactured by Dow Chemical Japan Co., Ltd., and "DOWSIL FZ-209" (diphenylsiloxyphenyl trimethicone) manufactured by Dow Chemical Japan Co., Ltd., and the like.

[0061] Specific examples of the hydrocarbon oil include liquid paraffin, hydrogenated polyisobutene (liquid isoparaffin, heavy liquid isoparaffin), cycloparaffin, liquid ozokerite, squalene, squalane, pristane, α-olefin oligomer, polybutene, and isohexadecane.

[0062] From the viewpoint of improving emulsion stability, the component (G) preferably contains one or more selected from the group consisting of ester oils and silicone oils, more preferably contains one or more selected from the group consisting of esters represented by general formula (1), general formula (3) or general formula (4), dimethylpolysiloxanes and phenyl-modified silicones, and even more preferably contains one or more selected from the group consisting of a monoester of a linear or branched fatty acid having from 8 to 18 carbon atoms and a linear or branched monohydric alcohol having from 2 to 24 carbon atoms, a triester of a branched fatty acid having from 6 to 18 carbon atoms and glycerin, a tetraester of a branched fatty acid having from 6 to 18 carbon atoms and pentaerythritol, a triester of a branched monohydric alcohol having from 6 to 18 carbon atoms and trimellitic acid, an alkyl benzoate (C12-15), and a carboxylic acid having a kinetic viscosity of 5000 mm at 25° C. 2 / s or less, and more preferably, the composition contains one or more selected from the group consisting of cetyl 2-ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, octyldodecyl myristate, isopropyl palmitate, glyceryl tri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, diisopropyl sebacate, tri-2-ethylhexyl trimellitate, alkyl benzoate (C12-15), and a kinetic viscosity at 25°C of 5000 mm 2 The composition contains one or more types selected from the group consisting of dimethylpolysiloxane and phenyltrimethicone having a viscosity of 1:1 or less.

[0063] From the viewpoint of improving emulsion stability, the content of component (G) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 1% by mass or more, more preferably 3% by mass or more, even more preferably 5% by mass or more, and preferably 30% by mass or less, more preferably 25% by mass or less, even more preferably 20% by mass or less, still more preferably 15% by mass or less, and even more preferably 10% by mass or less. More specifically, it is preferably 1 to 30% by mass, more preferably 3 to 25% by mass, even more preferably 5 to 20% by mass, still more preferably 5 to 15% by mass, and even more preferably 5 to 10% by mass.

[0064] <Component (H): Polyhydric alcohol> From the viewpoints of providing a fresh feeling upon application and good compatibility with the skin, it is preferable that the oil-in-water emulsion cosmetic of the present invention further contains a polyhydric alcohol as component (H). Examples of the component (H) include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (average molecular weight less than 650), 1,2-propanediol (propylene glycol), 1,3-propanediol (propanediol), dipropylene glycol, polypropylene glycol (average molecular weight less than 650), isoprene glycol, and 1,3-butylene glycol; and polyhydric alcohols such as glycerin, diglycerin, and polyglycerin. Among these, the component (H) is preferably a polyhydric alcohol having 2 to 12 carbon atoms, more preferably one or more selected from the group consisting of ethylene glycol, diethylene glycol, 1,2-propanediol (propylene glycol), 1,3-propanediol (propanediol), dipropylene glycol, 1,3-butylene glycol, and glycerin, and even more preferably one or more selected from the group consisting of propanediol, dipropylene glycol, 1,3-butylene glycol, and glycerin. These alcohols can be used alone or in combination of two or more.

[0065] From the viewpoint of ensuring a fresh feeling and good compatibility with the skin upon application, the content of component (H) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 0.5% by mass or more, more preferably 1% by mass or more, even more preferably 3% by mass or more, still more preferably 5% by mass or more, and is preferably 15% by mass or less, more preferably 13% by mass or less, and even more preferably 10% by mass or less.

[0066] The content of the oil phase component in the oil-in-water emulsion cosmetic of the present invention is preferably 3% by mass or more, more preferably 5% by mass or more, and even more preferably 10% by mass or more from the viewpoint of enhancing the ultraviolet protection effect, and is preferably 35% by mass or less, more preferably 30% by mass or less, even more preferably 25% by mass or less, and even more preferably 20% by mass or less from the viewpoint of improving emulsion stability and improving freshness and skin compatibility upon application. More specifically, it is preferably 3 to 35% by mass, more preferably 5 to 30% by mass, even more preferably 10 to 25% by mass, and even more preferably 10 to 20% by mass.

[0067] The oil-in-water emulsion cosmetic of the present invention can be suitably used as hair cosmetics such as shampoos, rinses, conditioners, etc., and skin cosmetics such as facial cleansers, cleansing cosmetics, sunscreen cosmetics, packs, massage cosmetics, etc. Among these, the oil-in-water emulsion cosmetic of the present invention has excellent ultraviolet protection effect, and is therefore preferably used for sunscreen applications such as sunscreen cosmetics (lotion, cream, milky lotion, serum, etc.), suntan, makeup base cosmetics, foundations, etc. The oil-in-water emulsion cosmetic of the present invention can be in the form of a liquid, emulsion, cream, paste, solid, etc., and can also be used as a sheet, spray, or mousse.

[0068] [Method of manufacturing oil-in-water emulsion cosmetics] The method for producing the oil-in-water emulsion cosmetic of the present invention is preferably a method comprising a step of emulsifying, under low shear force, an aqueous phase component preparation containing at least component (A) and component (B) and an oil phase component preparation containing at least component (C), from the viewpoints of forming a lamellar structure, improving emulsion stability, providing a fresh feeling and good compatibility with the skin upon application, and enhancing the ultraviolet protection effect.

[0069] The stirring means used for emulsification is not particularly limited as long as it can apply low shear force, and examples thereof include homomixers, "Disper" (product name, manufactured by Primix Corporation), "Clearmix" (product name, manufactured by M Technique Co., Ltd.), and "Cavitron" (product name, manufactured by Pacific Machinery Works Co., Ltd.). Among these, homomixers are preferred from the viewpoint of emulsification with low shear force. When a homomixer is used, the rotation speed of the homomixer is preferably 500 rpm or more, more preferably 1,000 rpm or more, even more preferably 1,500 rpm or more, and is preferably 8,000 rpm or less, more preferably 7,000 rpm or less, even more preferably 6,000 rpm or less.

[0070] In the production method of the present invention, from the viewpoint of emulsifying with low shear force, it is preferable to adjust the order of compounding the components of the oil-in-water emulsion cosmetic to adjust the viscosity of the mixture of the aqueous phase component preparation and the oil phase component preparation. In the production method of the present invention, for example, when the oil-in-water emulsion cosmetic further contains component (F), component (F) is preferably added after emulsification of the aqueous phase component preparation and the oil phase component preparation.

[0071] In the production method of the present invention, when component (D) is a combination of component (D1) and component (D2) and further contains component (F), it is preferable to include the following steps 1 to 5. Step 1: Mixing and dissolving component (D2) and a portion of component (E) to obtain preparation (i) Step 2: Heating and dissolving the aqueous phase components, including component (A), component (B), and the remainder of component (E), to obtain preparation (ii). Step 3: Heating and dissolving the oil phase components including component (C) and component (D1) to obtain preparation (iii) Step 4: mixing the preparation (ii) obtained in step 2 with the preparation (iii) obtained in step 3, and emulsifying the mixture under heating to obtain preparation (iv). Step 5: A step of cooling the preparation (iv) obtained in step 4, and then adding and mixing the preparation (i) obtained in step 1 and component (F) to obtain an oil-in-water emulsion cosmetic.

[0072] In step 1, the amount of component (E) is preferably 100 parts by mass or more, more preferably 200 parts by mass or more, even more preferably 300 parts by mass or more, per 100 parts by mass of the unneutralized amount of component (D2), and is preferably 1,000 parts by mass or less, more preferably 800 parts by mass or less, even more preferably 700 parts by mass or less.

[0073] In step 4, from the viewpoint of emulsifying with low shear force, it is preferable to perform emulsification by adjusting the viscosity of the mixture of preparation (ii) and preparation (iii) to preferably 10 mPa s or more, more preferably 50 mPa s or more, and preferably 20,000 mPa s or less, more preferably 10,000 mPa s or less. The heating temperature in steps 2 to 4 is preferably 30°C or higher and 90°C or lower, more preferably 50°C or higher and 90°C or lower, and further preferably 70°C or higher and 90°C or lower. In step 5, preparation (iv) obtained in step 4 is preferably cooled to a temperature range of 15°C or more and 35°C or less, and then preparation (i) obtained in step 1 and component (F) are added thereto.

[0074] In step 5, it is preferable to obtain an oil-in-water emulsion cosmetic by first mixing and dissolving or dispersing component (F) in water, and then adding and mixing it with preparation (i) obtained in step 1. That is, in the present invention, in addition to the above steps 1 to 5, it is preferable to further include the following step 1-1 prior to step 5. Step 1-1: A step of mixing component (F) and a part of component (E) to obtain a preparation (i-1) of component (F). The concentration of component (F) in preparation (i-1) varies depending on the molecular weight of component (F), but is preferably 0.5% by mass or more, more preferably 1% by mass or more, and preferably 3% by mass or less. EXAMPLES

[0075] The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these.

[0076] Examples 1 to 16 According to the formulations shown in Tables 1 and 2, each oil-in-water emulsion cosmetic was obtained by the following method. (Process 1-1) Components 17, 18 and a portion of component 36 were mixed to obtain preparation (i-1) having a concentration of components 17 and 18 of 2 mass%. (Process 1) Components 13 to 16 and a portion of component 36 (500 parts by mass relative to 100 parts by mass of the total blend amount of components 13 and 14) were mixed and dissolved to obtain preparation (i). (Process 2) Ingredients 1, 29 to 32 and the remainder of ingredient 36 were mixed and heated to 80° C. to dissolve, thereby obtaining preparation (ii). (Step 3) Components 2 to 12 and 22 to 27 were mixed and heated to 80° C. to dissolve, thereby obtaining preparation (iii). (Step 4) Preparation (ii) obtained in step 2 and preparation (iii) obtained in step 3 were mixed and emulsified using a homomixer (manufactured by Primix Corporation, model: TK Robomix, rotation speed 5,000 rpm) while maintaining the temperature at 80°C to obtain preparation (iv). (Step 5) Preparation (iv) obtained in step 4 was cooled to 35°C, and then preparation (i-1) obtained in step 1-1, preparation (i) obtained in step 1, and components 33 and 34 were added and mixed to obtain each oil-in-water emulsion cosmetic.

[0077] Example 17 An oil-in-water emulsion cosmetic was obtained in the same manner as in Example 1, except that step 1-1 was not performed and a commercially available thickener "SEPIGEL305" (containing 40% by mass of polyacrylic acid amide, 30% by mass of light liquid isoparaffin, 24% by mass of polyoxyethylene lauryl ether (HLB 12.5), and 6% by mass of purified water) (manufactured by SEPPIC) was used in place of preparation (i-1) in step 5.

[0078] Example 18 An oil-in-water emulsion cosmetic was obtained in the same manner as in Example 1, except that in step 1-1, component 20 was used instead of components 17 and 18.

[0079] Example 19 An oil-in-water emulsion cosmetic was obtained in the same manner as in Example 1, except that in step 1-1, component 21 was used instead of components 17 and 18.

[0080] Comparative Example 1 According to the formulation shown in Table 2, an oil-in-water emulsion cosmetic was obtained by the following method. (Process 1-1) Components 17, 18 and a portion of component 36 were mixed to obtain preparation (i-1) having a concentration of components 17 and 18 of 2 mass%. (Process 1) Components 13 to 16 and a portion of component 36 (500 parts by mass relative to 100 parts by mass of the total blend amount of components 13 and 14) were mixed and dissolved to obtain preparation (i). (Process 2) Preparation (i-1) obtained in step 1-1, components 1, 29 to 32, and the remainder of component 36 were mixed and heated to 80° C. to dissolve, thereby obtaining preparation (ii′). (Step 3) Components 2 to 12 and 22 to 27 were mixed and heated to 80° C. to dissolve, thereby obtaining preparation (iii). (Step 4) Preparation (ii') obtained in step 2 and preparation (iii) obtained in step 3 were mixed and emulsified using a homomixer (manufactured by Primix Corporation, model: TK Robomix, rotation speed 10,000 rpm) while maintaining the temperature at 80°C to obtain preparation (iv'). (Step 5) Preparation (iv') obtained in step 4 was cooled to 35°C, and then preparation (i) obtained in step 1 and components 33 and 34 were added and mixed to obtain an oil-in-water emulsion cosmetic.

[0081] Comparative Example 2 According to the formulation shown in Table 2, an oil-in-water emulsion cosmetic was obtained in the same manner as in Example 1, except that components 2 to 4 were not added in step 3 of Example 1.

[0082] The oil-in-water emulsion cosmetics obtained in the Examples and Comparative Examples were evaluated for the following: (1) confirmation of lamellar structure, (2) UV protection ability, (3) emulsion stability, and (4) usability (freshness upon application, compatibility with skin upon application). The results are shown in Tables 1 and 2.

[0083] (1) Confirmation of lamellar structure The lamellar structure was confirmed by polarized observation using a polarizing microscope "ECLIPSE LV100 POL" (Nikon Corporation). In the polarized observation, a lamellar structure was confirmed as "present", and a lamellar structure was not confirmed as "absent". Polarized microscope photographs of Example 2 and Comparative Example 1 are shown in Fig. 1 and Fig. 2, respectively. In Example 2, as shown in FIG. 1, a Maltese cross was observed, indicating that a lamellar structure had been formed. However, in Comparative Example 1, as shown in FIG. 2, no Maltese cross could be observed.

[0084] (2) UV protection ability The in vitro SPF value was determined in accordance with Example 1 described in JP 2017-146211 A.

[0085] (3) Emulsion stability Each oil-in-water emulsion cosmetic was allowed to stand at 60°C for one month, and the appearance of the emulsion was visually observed and evaluated according to the following criteria. 〔Judgment criteria〕 5: No change in appearance upon staring. 4: There is little change in appearance even with staring. 3: A slight change in appearance is discernible on close inspection, but no change at first glance. 2: Coalescence of emulsion droplets occurs, resulting in a rough appearance. 1: The oil and water phases are separated and the appearance appears heterogeneous.

[0086] (4) Sensation of use (freshness upon application, compatibility with skin upon application) A test was conducted on each oil-in-water emulsion cosmetic product by 10 expert panelists evaluating the cosmetics. Each expert panelist used each cosmetic product and rated it on a 5-point scale for "freshness upon application" and "skin compatibility upon application" based on the following evaluation criteria, and the average score was calculated from the sum of the scores of the 10 expert panelists for each cosmetic product. [Evaluation Criteria] 5: Good 4: Fairly good 3: Normal 2: Somewhat poor 1: Defective The average values ​​of each evaluation are shown in Tables 1 and 2. A higher average value indicates a better effect, with the average value exceeding 4.0 being very good, the average value being 4.0 or less and exceeding 3.0 being good, the average value being 3.0 or less and exceeding 2.0 being slightly poor, and the average value being 2.0 or less being poor.

[0087] [Table 1]

[0088] [Table 2]

[0089] Details of the components used in Tables 1 and 2 are shown below. *1: Croda's "SP Alacel 2121 MBAL-FL-(MV)" (a mixture of sorbitan monostearate and sucrose coconut oil fatty acid ester, mass ratio (sorbitan monostearate / sucrose coconut oil fatty acid ester) = 9) *2: BASF "UVINUL MC80" *3: BASF "UVINUL T-150" *4: BASF "TINOSORB S" *5: DSM "PARSOL 340" *6: BASF "UVINUL A PLUS GRANULAR" *7: DSM's "PARSOL SLX" *8: DSM "PARSOL 1789" *9:Merck "EUSOLEX 232" *10: Chirochem "Solfilter-TDSA-H" *11:3V SIGMA "Sinterlen L" *12: "Echo Gum" manufactured by DSP Gokyo Food & Chemical Co., Ltd. *13: SEPPIC "SEPIGEL305" *14: Lubrizol Advanced Materials' "PEMULEN TR-1" *15: "HEC Daicel SE400" manufactured by Daicel Miraize Co., Ltd. *16: "KF-96-10cs" manufactured by Shin-Etsu Chemical Co., Ltd. *17: "DOWSIL FZ-209" manufactured by Dow Chemical Japan Co., Ltd.

[0090] It can be seen from Tables 1 and 2 that the oil-in-water emulsion cosmetics according to the examples of the present invention have superior UV protection ability, excellent emulsion stability, and provide a fresh feeling and good skin compatibility upon application, compared to the oil-in-water emulsion cosmetics of the comparative examples.

Claims

1. An oil-in-water emulsion cosmetic preparation comprising the following components (A) to (E) and having a lamellar structure: Component (A): A nonionic surfactant containing a sorbitan fatty acid ester and having an HLB of 6.0 or less. Component (B): Sucrose fatty acid ester with HLB of more than 6.0 Component (C): higher alcohol having 14 to 24 carbon atoms Component (D): UV absorber Component (E): Water wherein the mass ratio of the content of component (C) to the total content of components (A) and (B) [(C) / [(A)+(B)]] is 0.5 or more and 5.0 or less; In the oil-in-water emulsion cosmetic, the content of the oil phase component is 5% by mass or more and 35% by mass or less.

2. 2. The oil-in-water emulsion cosmetic according to claim 1, wherein the component (D) is one or more members selected from the group consisting of the following components (D1) and (D2): Component (D1): Water-insoluble UV absorber Component (D2): UV absorber having a sulfonic acid group or its salt

3. 3. The oil-in-water emulsion cosmetic according to claim 2, wherein component (D) is a combination of component (D1) and component (D2).

4. 4. The oil-in-water emulsion cosmetic according to claim 2 or 3, wherein component (D2) comprises one or more members selected from the group consisting of phenylbenzimidazole sulfonic acid, terephthalylidene dicamphor sulfonic acid, and salts thereof.

5. 5. The oil-in-water emulsion cosmetic according to claim 1, wherein component (A) is sorbitan monostearate, and component (B) is a sucrose coconut oil fatty acid ester.

6. The oil-in-water emulsion cosmetic according to any one of claims 1 to 5, further comprising a water-soluble thickener as component (F).

7. The oil-in-water emulsion cosmetic according to any one of claims 1 to 6, wherein the content of the oil phase component is 5% by mass or more and 30% by mass or less.

8. The oil-in-water emulsion cosmetic according to any one of claims 1 to 7, which is used for sunscreen purposes.

9. A method for producing an oil-in-water emulsion cosmetic composition having a lamellar structure, comprising the steps of: Component (A): A nonionic surfactant containing a sorbitan fatty acid ester and having an HLB of 6.0 or less. Component (B): Sucrose fatty acid ester with HLB of more than 6.0 Component (C): higher alcohol having 14 to 24 carbon atoms Component (D): UV absorber Component (E): Water Component (F): Water-soluble thickener wherein component (D) is a combination of a water-insoluble ultraviolet absorber as component (D1) and an ultraviolet absorber having a sulfonic acid group or a salt thereof as component (D2), a mass ratio of the content of component (C) to the total content of components (A) and (B), [(C) / [(A)+(B)]], is 0.5 or more and 5.0 or less; In the oil-in-water emulsion cosmetic, the content of the oil phase component is 5% by mass or more and 35% by mass or less, A method for producing an oil-in-water emulsion cosmetic, comprising the following steps 1 to 5: Step 1: A step of mixing and dissolving component (D2) and a part of component (E) to obtain preparation (i) Step 2: Heating and dissolving the aqueous phase components including component (A), component (B), and the remaining component (E) to obtain preparation (ii). Step 3: A step of heating and dissolving the oil phase components including the component (C) and the component (D1) to obtain the preparation (iii) Step 4: A step of mixing the preparation (ii) obtained in step 2 with the preparation (iii) obtained in step 3 and emulsifying the mixture under heating to obtain a preparation (iv). Step 5: A step of cooling the preparation (iv) obtained in step 4, and then adding and mixing the preparation (i) obtained in step 1 and component (F) to obtain an oil-in-water emulsion cosmetic.

Images