sunscreen cosmetics

Abstract

To provide a sunscreen cosmetic which has a sufficient ultraviolet protective effect even without substantially containing an organic ultraviolet absorber, is further excellent in lack of a feeling of burden on the applied film and seawater resistance and also has an excellent elution suppression effect of metal ions.SOLUTION: There is provided a sunscreen cosmetic which comprises (A) 10 to 40 mass% of hydrophobic surface treated zinc oxide and / or titanium oxide having an average particle diameter of less than 100 nm and (B) one or two or more monovalent alkali metal salts selected from the group consisting of alginic acid, acylmethyltaurine and acylglutamic acid, and substantially contains no organic ultraviolet absorber.SELECTED DRAWING: None

Description

[Technical Field]

[0001] This invention relates to sunscreen cosmetics. It also relates to a method for inhibiting the elution of metal ions from compositions containing zinc oxide and / or titanium dioxide, and to a metal ion elution inhibitor. [Background technology]

[0002] Conventional sunscreen cosmetics contain organic UV absorbers and metal oxides as ingredients to protect the skin from ultraviolet rays. In recent years, due to consumer preferences, there has been a demand for the development of sunscreen cosmetics that do not contain organic UV absorbers. There is a need to develop formulations that provide satisfactory UV protection using only metal oxides, without containing organic UV absorbers. To achieve this, it is necessary to increase the content of metal oxides, but this can lead to problems such as a heavy feeling on the applied film and poor spreadability during application.

[0003] Furthermore, some studies have reported that sunscreen cosmetics may have an impact on the marine environment. Research is also progressing on the effects of metal oxides on the marine environment. For example, it has been suggested that zinc ions, when present in seawater at concentrations of 0.1 ppm or higher, may affect Stylophora pistillata, a type of hard coral (see, for example, Non-Patent Document 1). In particular, when sunscreens that do not contain organic UV absorbers and rely solely on metal oxides to provide UV protection, it becomes necessary to consider such environmental impacts.

[0004] Furthermore, while sunscreen cosmetics are required to function for extended periods, friction with clothing during daily life and contact with moisture from the external environment such as sweat and seawater can cause the cosmetic to be removed from the skin, raising concerns about a decrease in UV protection effectiveness. Against this backdrop, technologies to suppress the decrease in UV protection effectiveness are being investigated. For example, in oil-in-water emulsion sunscreen cosmetics that maintain high UV protection effectiveness even when in contact with water or sweat and have a superior feel, a technology has been disclosed in which the UV protection ability is improved upon contact with water by blending a UV protection agent and a fatty acid that is solid at room temperature in a specific ratio (see, for example, Patent Document 1). In particular, in situations where the risk of UV exposure is high, such as swimming in the sea during the summer, and where the sunscreen coating film is likely to be removed by sweat or seawater, sufficient UV protection effectiveness, and even the suppression of the decrease in UV protection effectiveness, is especially important. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] Coral Reefs 2019.38:109-122 [Patent Documents]

[0006] [Patent Document 1] International Publication No. 2016 / 068299 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, while the technology disclosed in Patent Document 1 offers excellent UV protection, it contains an organic UV absorber, and there were cases where it was desirable to further enhance its seawater resistance. In addition to the above, there were also cases where it was desirable to further reduce the burden on the coated film.

[0008] Furthermore, regarding metal oxides, while numerical ranges that could potentially affect the marine environment have been suggested and investigated, technologies for suppressing them based on those ranges have not been sufficiently considered.

[0009] Therefore, the present invention has been made in view of the above circumstances, and its main objective is to provide a sunscreen cosmetic that has sufficient UV protection effect even without substantially containing organic UV absorbers, and furthermore has excellent lightness of the applied film and excellent seawater resistance, and also has excellent effect in suppressing the elution of metal ions. [Means for solving the problem]

[0010] In light of the above issues, the inventors conducted thorough research. As mentioned above, in order to maintain sufficient UV protection, it is necessary to retain the sunscreen cosmetic on the skin. However, it is known that metal oxides dissolve upon contact with water. Therefore, the inventors focused on the possibility of improving film strength by including a component in the cosmetic film that reacts with divalent metal ions in seawater upon contact with seawater to produce an insoluble salt, in order to suppress the dissolution of metal ions upon contact with water, especially seawater. As a result of examining various components capable of forming insoluble salts, the inventors found that including one or more monovalent alkali metal salts selected from the group consisting of alginic acid, acylmethyl taurine, and acyl glutamic acid in the sunscreen cosmetic increases film strength and provides a particularly excellent effect in suppressing the dissolution of metal ions.

[0011] In other words, the present invention provides the following: (A) Hydrophobically treated zinc oxide and / or titanium oxide with an average particle size of less than 100 nm, 10-40% by mass (B) One or more monovalent alkali metal salts selected from the group consisting of alginic acid, acylmethyltaurine, and acylglutamic acid. This is a sunscreen cosmetic that contains [ingredient name] and substantially does not contain organic UV absorbers. The component (B) may be one or more monovalent alkali metal salts selected from the group consisting of alginic acid, stearoyl methyl taurine, myristoyl methyl taurine, lauroyl methyl taurine, stearoyl glutamic acid, myristoyl glutamic acid, and lauroyl glutamic acid. The component (B) may be one or more monovalent alkali metal salts selected from the group consisting of alginic acid, stearoylmethyl taurine, and lauroyl glutamic acid. The mass ratio of component (A) to component (B), (A) / (B), may be between 10 and 3000. The content of component (B) may be 0.01 to 1% by mass in the sunscreen cosmetic. Place 2g of sunscreen cosmetic on a glass plate at 1000cm 2 After applying the solution to the specified area and allowing it to dry, the concentration of zinc ions and / or titanium ions in the seawater after immersion in 50 L of seawater for one week may be less than 0.1 ppm. A method for suppressing the elution of metal ions from a composition containing component (A) using the following component (B) may also be used. (A) Hydrophobized zinc oxide and / or titanium oxide with an average particle size of less than 100 nm. (B) One or more monovalent alkali metal salts selected from the group consisting of alginic acid, acylmethyltaurine, and acylglutamic acid. The composition may be a sunscreen cosmetic, and the method may also involve inhibiting the elution of metal ions. The following component (B) may be used as an inhibitor of metal ion elution from a composition containing component (A). (A) Hydrophobically treated zinc oxide and / or titanium oxide with an average particle size of less than 100 nm. (B) One or more monovalent alkali metal salts selected from the group consisting of alginic acid, acylmethyltaurine, and acylglutamic acid.

[0012] Furthermore, this technology can also incorporate the following additional configurations. It may also be a method for suppressing the elution of zinc ions and / or titanium ions into seawater using the component (B). It may also be a method for suppressing the elution of zinc ions and / or titanium ions by forming insoluble salts using the component (B). It may also be a method for suppressing the elution of zinc ions and / or titanium ions by contact with seawater using the component (B). It may also be a method for suppressing the elution of zinc ions and / or titanium ions by improving the film strength using the component (B). It may also be an elution inhibitor for zinc ions and / or titanium ions used in a sunscreen cosmetic substantially free of an organic ultraviolet absorber. It may also be an elution inhibitor for zinc ions and / or titanium ions into seawater using the component (B). It may also be an elution inhibitor for zinc ions and / or titanium ions by forming insoluble salts using the component (B). It may also be an elution inhibitor for zinc ions and / or titanium ions by contact with seawater using the component (B). It may also be an elution inhibitor for zinc ions and / or titanium ions by improving the film strength using the component (B).

Advantages of the Invention

[0013] The sunscreen cosmetic of the present invention exhibits a high ultraviolet protection effect despite substantially containing no ultraviolet absorber, and is excellent in the lack of a burden feeling of the coating film. Furthermore, it is also excellent in seawater resistance and the effect of suppressing the elution of metal ions. Also, according to the present invention, even without containing a film-forming agent, a solid oil agent, a surfactant, etc., the elution of metal ions is suppressed and an excellent ultraviolet protection effect can be exhibited, so that a sunscreen cosmetic having no burden feeling on the coating film, no stickiness, and good spreading can be obtained.

Embodiments for Carrying Out the Invention

[0014] Hereinafter, preferred embodiments for implementing the present invention will be described. The embodiments described below show an example of a typical embodiment of the present invention, and the scope of the present invention is not construed narrowly thereby. Also, in this specification, percentages are expressed by mass unless otherwise specified. In this specification, "X~Y" indicating a range includes X and Y and means "X or more and Y or less".

[0015] 1. First Embodiment According to the Present Invention

[0016] This first embodiment can provide a sunscreen cosmetic containing (component (A)) hydrophobically surface-treated zinc oxide and / or titanium oxide with an average particle diameter of less than 100 nm, and (component (B)) one or more monovalent alkali metal salts selected from the group consisting of alginic acid, acylmethyltaurine, and acylglutamic acid, and substantially free of an organic ultraviolet absorber.

[0017] (Component (A): Hydrophobically surface-treated zinc oxide and / or titanium oxide with an average particle diameter of less than 100 nm)

[0018] The hydrophobically surface-treated zinc oxide and / or titanium oxide with an average particle diameter of less than 100 nm, which is used in the present invention, is a metal oxide that blocks ultraviolet rays by absorbing, scattering, reflecting, quenching, etc. ultraviolet rays in a wide range from UVB to UBA (290~400 nm).

[0019] For component (A), zinc oxide and titanium dioxide are preferably used in fine particle form, with an average particle diameter of less than 100 nm, preferably 80 nm or less, more preferably 50 nm or less, and even more preferably 35 nm or less. Furthermore, while the lower limit of the average particle diameter of zinc oxide in sunscreen cosmetics is not particularly limited, as smaller diameters result in better transparency, etc., it is generally preferred to be 1 nm or larger, 3 nm or larger, and more preferably 5 nm or larger. Additionally, the average particle diameter of zinc oxide is preferably 1 nm or more and less than 100 nm, more preferably 3 nm or more and less than 100 nm, even more preferably 5 to 50 nm, and even more preferably 5 to 35 nm. These ranges are preferable because they provide superior UV protection and transparency. In this invention, the average particle diameter can be measured as the average particle size by image analysis of transmission electron microscope images. Approximately 10 mg of the sample is thoroughly mixed and dispersed on a glass slide with 1-propanol to obtain a dispersion. The dispersion is stretched to obtain a thin film sample. The thin film of the sample is placed on a transmission electron microscope (TEM) mesh with a support film. The mesh (dried coating) is set in a transmission electron microscope (S-4800, Hitachi High-Technologies Corporation) and observed to obtain an image of the dried coating film showing individual particles. The image of this dried coating film surface is processed using an image analysis particle size distribution analyzer (Mac-View, Mountec Co., Ltd.) with 1000 particles each to measure, and the particle size is measured. This allows us to obtain the average particle size D50 of the sample (powder) through image analysis of transmission electron microscope (TEM) images.

[0020] The shape of the zinc oxide and titanium dioxide of component (A) is not particularly limited, as long as they are commonly used in cosmetics, quasi-drugs, pharmaceuticals, etc. Examples include granular, spherical, spindle-shaped, dendritic, balloon-shaped, etc., and in the present invention, granular, spherical, and spindle-shaped are preferred. The average particle size is measured along the longest side. Examples of commercially available zinc oxide include the FINEX series (manufactured by Sakai Chemical Co., Ltd.) and the MZ series (manufactured by Teika Co., Ltd.). Examples of commercially available titanium dioxide include the TTO-55 series, TTO-51 series (manufactured by Ishihara Sangyo Co., Ltd.), JR series, JA series, MT series (manufactured by Teika Co., Ltd.), and STR series (manufactured by Sakai Chemical Industry Co., Ltd.).

[0021] The zinc oxide and titanium oxide are subjected to surface treatment. Surface treatment is preferable because it improves seawater resistance and other properties, thereby enhancing the effects of the present invention. The hydrophobic treatment agent is not particularly limited as long as it is commonly used in cosmetics, quasi-drugs, pharmaceuticals, etc., but examples include silicone treatment agents, fluorine treatment agents, organic titanate treatment agents, fatty acids, lecithin, and acylated amino acids. Among these, from the viewpoint of UV protection effect, seawater resistance, and the lightness of the coated film, it is preferable to use one or more selected from silicone treatment agents, organic titanate treatment agents, fatty acids, and acylated amino acids, and more preferably one or more selected from silicone treatment agents and fatty acids.

[0022] Examples of silicone treatment agents include chain-like silicones such as low-molecular-weight dimethylpolysiloxane, high-molecular-weight dimethylpolysiloxane, and methylphenylpolysiloxane; modified silicones such as amino-modified silicones, alkyl-modified silicones, and alkoxy-modified silicones; silicone resins such as trimethylsiloxysilicate and acrylic-silicone graft copolymers; silicone rubbers; partially or fully crosslinked organopolysiloxanes; silylation agents; and silane coupling agents. One or more selected from this group can be used. Among these, the use of silane coupling agents is preferred.

[0023] Among silane coupling agents, trialkoxyalkylsilanes are preferred, although they are not particularly limited. Trialkoxyalkylsilanes are compounds in which three alkoxy groups and one alkyl group are bonded to a silicon atom, and these alkoxy groups react with hydroxyl groups and other elements on the powder surface to chemically modify the powder surface. In the trialkoxyalkylsilane, the alkoxy groups are preferably alkoxy groups having 1 to 3 carbon atoms, such as methoxy, ethoxy, and propoxy. In the trialkoxyalkylsilane, the alkyl group is preferably an alkyl group having 6 to 18 carbon atoms, such as hexyl, octyl, decyl, and octadecyl groups. Examples of such trialkoxyalkylsilanes include trimethoxyhexylsilane, trimethoxyoctylsilane, trimethoxydecylsilane, trimethoxyoctadecylsilane, triethoxyhexylsilane, triethoxyoctylsilane, triethoxydecylsilane, and triethoxyoctadecylsilane. Among these, it is more preferable that one or more are selected from the group consisting of trimethoxyoctylsilane and triethoxyoctylsilane.

[0024] Examples of fatty acids include fatty acids and their metal salts, among which fatty acids with 12 to 18 carbon atoms are preferred, and stearic acid is more preferred. Examples of salts thereof include calcium, magnesium, zinc, and aluminum, with aluminum salts being more preferred.

[0025] Examples of organic titanate treatment agents include alkyl titanates such as long-chain carboxylic acid type, pyrophosphate type, phosphorous acid type, and amino acid type, with alkyl titanates having an alkyl group with 8 to 24 carbon atoms being preferred. Specifically, examples of the alkyl titanates include isopropyl triisostearoyl titanate, isopropyl trioctanoyl titanate, isopropyl dimethacrylate isostearoyl titanate, isopropyl isostearoyl diacrylic titanate, and diisostearoylethylene titanate as long-chain carboxylic acid type alkyl titanates, and tetraisopropyl bis(dioctyl phosphite) titanate and tetraoctyl bis(ditridecyl phosphate) titanate as pyrophosphate type alkyl titanates. Examples of alkyl titanates include tetra(2,2-diallyloxymethyl-1-butyl)bis(ditridecylphosphite) titanate, isopropyltri(dioctyl pyrophosphate) titanate, bis(dioctyl pyrophosphate) oxyacetate titanate, and bis(dioctyl pyrophosphate) ethylene titanate, as well as amino acid type alkyl titanates. In the present invention, among these alkyl titanates, long-chain carboxylic acid type alkyl titanates are preferred, and isopropyltriisostearoyl titanate is more preferred.

[0026] Examples of fluorine treatment agents include fluorine compounds such as fluorine-modified silicones, perfluoroalkyl phosphates and their salts, perfluoropolyethers, fluoroalkoxysilanes, perfluoropolyetheralkyl phosphates and their salts, and perfluoroalkylsilanes. One or more of these can be used.

[0027] Lecithin is a lipid containing a phosphate group, regardless of whether it is animal-derived, plant-derived, hydrogenated, or unhydrogenated, and regardless of its PC (phosphatidylcholine) purity. Specifically, commercially available products such as Ajinomoto Lecithin (manufactured by Ajinomoto Co., Inc.), which is a soybean phospholipid, and Lesinol S-10 and S-10E (both manufactured by Nikko Chemicals Co., Ltd.), which are hydrogenated soybean lecithins, can be used as is. Phospholipid (lecithin) derivatives include copolymers of phospholipids and acrylic polymers.

[0028] Acylated amino acids are amino acids in which a hydrogen atom of the amino group is replaced by an acyl group. The acyl group is a linear or cyclic saturated or unsaturated group with 1 to 20 carbon atoms. Examples include N-acetylglutamic acid, N-lauroylglutamic acid, N-myristylalanine, N-oleylthreonine, N-cinnamoylglycine, and N-nicotinoylglutamic acid. Salts include sodium salts, potassium salts, and triethanolamine salts.

[0029] The method for hydrophobic treatment of component (A) is not particularly limited and can be manufactured by commonly known methods. For example, the desired hydrophobic powder can be obtained by adding the hydrophobic treatment agent and the powder particles to be treated to a solvent, stirring with a ball mill or the like, drying as necessary, repeatedly washing with water and filtering to remove impurities, and then drying and grinding. Alternatively, several types of surface treatment compounds can be used to surface-treat the material simultaneously, or the material can be surface-treated with one compound first, and then further surface-treated with other compounds.

[0030] In hydrophobized zinc oxide (hereinafter simply abbreviated as "zinc oxide of component (A)") having an average particle size of component (A) of less than 100 nm, the mass of the hydrophobizing agent is not particularly limited, but as a lower limit, from the viewpoint of UV protection effect and seawater resistance, it is preferably 0.1% by mass (hereinafter sometimes simply abbreviated as "%") or more relative to the mass of powder before treatment, more preferably 1% or more, and even more preferably 3% or more. Furthermore, as an upper limit, from the viewpoint of not feeling burdensome on the coating film, it is preferably 30% or less relative to the mass of powder before treatment, more preferably 20% or less, and even more preferably 15% or less.

[0031] In hydrophobized titanium dioxide (hereinafter simply abbreviated as "titanium dioxide of component (A)") having an average particle size of component (A) of less than 100 nm, the mass of the hydrophobizing agent is not particularly limited, but as a lower limit, from the viewpoint of UV protection effect and seawater resistance, it is preferably 10% or more, more preferably 15% or more, and even more preferably 20% or more relative to the mass of powder before treatment. Furthermore, as an upper limit, from the viewpoint of not feeling burdensome on the coating film, it is preferably 50% or less, more preferably 45% or less, and even more preferably 40% or less relative to the mass of powder before treatment.

[0032] In the present invention, the content of component (A) in the sunscreen cosmetic is preferably 15% or more, with a lower limit of 10% or more. With an upper limit of 40% or less, preferably 35% or less, and more preferably 30% or less. Furthermore, the content of component (A) in the sunscreen cosmetic is preferably 10-40%, preferably 15-35%, and more preferably 15-30%. This range is preferable because it provides superior UV protection, a light coating, and an effective suppression of metal ion elution.

[0033] In the present invention, the combined use of zinc oxide and titanium dioxide of component (A) is not essential, but when used in combination, the content of zinc oxide is not particularly limited, however, as a lower limit, it is preferably 8% or more, more preferably 10% or more, and even more preferably 15% or more in the sunscreen cosmetic. As an upper limit, it is preferably 30% or less, and even more preferably 25% or less. Furthermore, when used in combination, the content of zinc oxide is preferably 8-30%, more preferably 10-30%, and even more preferably 15-25%. This range is preferable because it provides superior UV protection and a lighter feel on the skin. When component (A) is used in combination, the content of titanium dioxide is not particularly limited, but as a lower limit, it is preferably 2% or more, more preferably 5% or more in the sunscreen cosmetic. As an upper limit, it is preferably 20% or less, and even more preferably 15% or less. Furthermore, when used in combination, the titanium dioxide content is preferably 2-20%, more preferably 2-15%, and even more preferably 5-15%. This range is preferable because it provides superior UV protection and a less burdensome coating.

[0034] (Component (B): One or more monovalent alkali metal salts selected from the group consisting of alginic acid, acylmethyl taurine, and acyl glutamic acid)

[0035] The component (B) used in this invention, which is one or more monovalent alkali metal salts selected from the group consisting of alginic acid, acylmethyl taurine, and acyl glutamic acid (hereinafter sometimes simply referred to as "component (B)"), is not particularly limited as long as it is commonly used in cosmetics, quasi-drugs, pharmaceuticals, etc.

[0036] The acyl in component (B), acylmethyltaurine and acylglutamic acid, is derived from long-chain fatty acids. The number of carbon atoms in these fatty acids is not particularly limited, but is generally between 8 and 22, and more preferably between 12 and 18. The fatty acids can be straight-chain or branched-chain, derived from saturated or unsaturated fatty acids. More specifically, examples of fatty acids include caprylic acid, capric acid, lauric acid, myristic acid, stearic acid, isostearic acid, palmitic acid, oleic acid, linoleic acid, behenic acid, coconut oil fatty acid, and palm fatty acid. One of these may be used, or two or more selected from the above group may be used in combination. Among these, at least one selected from the group consisting of stearic acid, myristic acid, and lauric acid is more preferable. Using these components improves the membrane strength when reacting with divalent metal ions in seawater to produce insoluble salts, and is more preferable because it provides superior effects of the present invention, such as seawater resistance and suppression of metal ion elution.

[0037] In component (B), alkali metals are the elements of Group 1 of the periodic table excluding hydrogen, such as sodium and potassium. Furthermore, the alkali metal salt in component (B) may be a pre-formed salt or a salt produced by a neutralization reaction during manufacturing. More specifically, examples of alginates include sodium alginate and potassium alginate, with sodium alginate being more preferred. Examples of acylmethyltaurine salts include sodium N-stearoyl-N-methyltaurine, sodium N-myristoyl-N-methyltaurine, sodium coconut oil fatty acid methyltauride, and sodium lauryl methyltauride, with sodium N-stearoyl-N-methyltaurine being more preferred. Examples of acyl glutamate salts include potassium N-lauroyl-L-glutamate, potassium N-myristoyl-L-glutamate, arginine salt N-stearoyl-L-glutamate, potassium N-stearoyl-L-glutamate, and sodium N-stearoyl-L-glutamate, with sodium N-lauroyl-L-glutamate being more preferred. These may be used individually or in combination of two or more.

[0038] In the present invention, the content of component (B) is not particularly limited, but preferably at a lower limit of 0.01% or more, more preferably at 0.05% or more, and preferably at an upper limit of 1% or less, more preferably at 0.5% or less, and even more preferably at 0.2% or less. Furthermore, the content of component (B) is preferably 0.01 to 1%, more preferably 0.05 to 1%, even more preferably 0.05 to 0.5%, and even more preferably 0.05 to 0.2%. This range is preferable because it provides superior resistance to seawater, a light coating, and an effect of suppressing the elution of metal ions. Note that the content of component (B) refers to the content as a salt.

[0039] The aforementioned component (B) has the following effects: inhibiting the elution of zinc oxide and / or titanium dioxide; inhibiting the elution of zinc oxide and / or titanium dioxide into seawater; inhibiting the elution of zinc oxide and / or titanium dioxide by forming insoluble salts; inhibiting the elution of zinc oxide and / or titanium dioxide by contact with seawater; and inhibiting the elution of zinc oxide and / or titanium dioxide by improving film strength.

[0040] Although the present invention can be obtained by appropriately including component (A) and component (B), it is preferable to specify the mass ratio of component (A) and component (B) so that higher effects can be expected in terms of seawater resistance, lack of burden on the coating film, and suppression of metal ion elution. The mass ratio of (A) / (B) is not particularly limited, but as a lower limit, it is preferably 10 or more, more preferably 30 or more, even more preferably 100 or more, even more preferably greater than 100, and particularly preferably 150 or more. As an upper limit, it is preferably 3000 or less, more preferably 1000 or less, even more preferably 500 or less, even more preferably 400 or less, particularly preferably less than 400, and even more preferably 300 or less. Furthermore, the mass ratio of (A) / (B) is preferably 10 to 3000, more preferably 30 to 3000, even more preferably 100 to 1000, even more preferably over 100 and 500 or less, particularly preferably 150 to 400, more preferably 150 or more and less than 400, and most preferably 150 to 300.

[0041] In the present invention, specifying the mass ratio of zinc oxide in component (A) and component (B) is preferable because it allows for high effectiveness in terms of seawater resistance, the lightness of the coating film, and the suppression of metal ion elution. The mass ratio of (zinc oxide of component (A)) / (B) is not particularly limited, but as a lower limit, it is preferably 20 or more, more preferably 50 or more, even more preferably 80 or more, even more preferably greater than 80, and particularly preferably 100 or more. As an upper limit, it is preferably 2000 or less, more preferably 1000 or less, even more preferably 500 or less, even more preferably 250 or less, particularly preferably less than 250, and even more preferably 200 or less. Furthermore, the mass ratio of (zinc oxide of component (A)) / (B) is preferably 20 to 2000, more preferably 50 to 1000, even more preferably 80 to 500, even more preferably greater than 80 and 250 or less, particularly preferably 100 to 250, more preferably 100 to less than 250, and most preferably 100 to 200. In addition, in the present invention, specifying the mass ratio of titanium oxide of component (A) and component (B) is preferable because it can be expected to have a high effect in terms of seawater resistance, lack of burden on the coating film, and suppression of metal ion elution. While such a mass ratio of (titanium oxide of component (A)) / (B) is not particularly limited, as a lower limit, it is preferably 10 or more, more preferably 20 or more, even more preferably greater than 20, even more preferably 40 or more, and even more preferably 60 or more. As an upper limit, it is preferable that it be 1000 or less, more preferably 500 or less, even more preferably 300 or less, even more preferably 150 or less, particularly preferably less than 150, and more preferably 100 or less. Furthermore, the mass ratio of (titanium dioxide of component (A)) / (B) is preferably 10 to 1000, more preferably 20 to 500, even more preferably over 20 and 300, even more preferably 40 to 150, particularly preferably 60 to 150, more preferably 60 or more and less than 150, and more preferably 60 to 100.

[0042] Cosmetics containing the above components (A) and (B) have the following effects: inhibiting the elution of zinc oxide and / or titanium dioxide; inhibiting the elution of zinc oxide and / or titanium dioxide into seawater; inhibiting the elution of zinc oxide and / or titanium dioxide by the formation of insoluble salts; inhibiting the elution of zinc oxide and / or titanium dioxide by contact with seawater; and inhibiting the elution of zinc oxide and / or titanium dioxide by improving film strength.

[0043] Furthermore, the present invention preferably contains substantially no organic UV absorbers, and by substantially containing no organic UV absorbers, a sunscreen cosmetic that satisfies consumer preferences can be obtained. In the present invention, organic UV absorbers include any that are commonly used in cosmetics, such as water-soluble organic UV absorbers and oil-soluble organic UV absorbers. Specifically, for example, 2-hydroxy-4-methoxybenzophenone, 2,4,6-trianilino-p-(carbo-2'-ethylhexyl-1'-oxy)-1,3,5-triazine, 2-ethylhexyl salicylate, ethyl paradihydroxypropylbenzoate, 2-ethylhexyl paramethoxycinnamate, 4-tert-4'-methoxydibenzoylmethane, hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate, dimethoxybenzylidene dio Examples include 2-ethylhexyl xoimidazolidinepropionate, 2,2'-methylenebis[6-(2H-benzotriazol-2yl)-4-(1,1,3,3-tetramethylbutyl)phenol], 2,4-bis[{4-(2-ethylhexyloxy)-2-hydroxy}phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine, dimethiconediethylbenzalmalonate, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid and its sodium salt. Here, "substantially absent" in the present invention means 1% or less in the sunscreen cosmetic, preferably 0.5% or less, more preferably 0.1% or less, and even more preferably 0% (not present).

[0044] The sunscreen cosmetic of the present invention is more preferably used in an environment in which it may come into contact with water containing salt. This environment is preferable because it allows the effects of the present invention to be more easily exhibited. The environment in which it may come into contact with water containing salt is not particularly limited, but examples include sandy beaches, beaches, seashores, lakeshores, riverbanks, shorelines, swimming areas such as beaches and lakeshores. Even in such environments in which it may come into contact with water containing salt, it is possible to maintain the ultraviolet protection effect. Therefore, the sunscreen cosmetic of this first embodiment may be a cosmetic intended for use in an environment in which it may come into contact with water containing salt.

[0045] Furthermore, as another aspect of this first embodiment, a product kit comprising a product containing a composition containing component (A) and a product containing a composition containing component (B), or a product containing component (A) and a product containing component (B) may be used together, either simultaneously or separately, to combine component (A) and component (B). Alternatively, the sunscreen cosmetic of this first embodiment may be prepared by simultaneously or separately mixing component (A) and component (B) contained in the product kit, or a product kit capable of such preparation may be provided. For example, a practitioner or end-user may mix component (A) and component (B) before use and apply the mixture to the skin, or they may apply component (A) and component (B) to the skin simultaneously or separately and mix them on the skin to prepare the composition of this first embodiment.

[0046] Furthermore, as another aspect of this first embodiment, it is possible to provide agents containing component (A) and component (B) or the use thereof for the purposes described above, such as suppressing the elution of zinc oxide and / or titanium dioxide, suppressing the elution of zinc oxide and / or titanium dioxide into seawater, suppressing the elution of zinc oxide and / or titanium dioxide by the formation of insoluble salts, suppressing the elution of zinc oxide and / or titanium dioxide by contact with seawater, and suppressing the elution of zinc oxide and / or titanium dioxide by improving film strength, and these can be contained in or blended into various agents or compositions.

[0047] Furthermore, as another aspect of this first embodiment, the sunscreen cosmetic of this first embodiment can be used in methods for inhibiting the elution of zinc oxide and / or titanium dioxide, methods for inhibiting the elution of zinc oxide and / or titanium dioxide into seawater, methods for inhibiting the elution of zinc oxide and / or titanium dioxide by the formation of insoluble salts, methods for inhibiting the elution of zinc oxide and / or titanium dioxide by contact with seawater, methods for inhibiting the elution of zinc oxide and / or titanium dioxide by improving film strength, etc. Also, using component (B), it can be used in methods for inhibiting the elution of zinc oxide and / or titanium dioxide, methods for inhibiting the elution of zinc oxide and / or titanium dioxide into seawater, methods for inhibiting the elution of zinc oxide and / or titanium dioxide by the formation of insoluble salts, methods for inhibiting the elution of zinc oxide and / or titanium dioxide by contact with seawater, methods for inhibiting the elution of zinc oxide and / or titanium dioxide by improving film strength, etc.

[0048] The seawater used in this invention is not particularly limited, and natural seawater, artificial seawater, or a combination of natural and artificial seawater can be used.

[0049] Natural seawater is not limited to any seawater that exists in nature, but examples include surface water and deep-sea water. Deep-sea water is seawater collected from the deep ocean at depths of 200m or more, and it has excellent properties such as nutrient deficiency, purity, low temperature, and water quality stability. Deep-sea water has little fluctuation in water quality, and its properties remain almost stable throughout the year.

[0050] Artificial seawater is seawater prepared by carefully blending essential trace elements found in natural seawater in a balanced manner. In this invention, artificial seawater can be used without any particular limitations. The method for preparing artificial seawater is not particularly limited, but it is preferable to use commercially available artificial seawater mix, and it is more preferable to use artificial seawater with a specific gravity of 1.020 to 1.024. Examples of commercially available products include GEX's artificial seawater, Seawater.

[0051] The agent or sunscreen cosmetic containing component (A) and component (B) of the present invention may contain, in addition to the essential components described above, other components commonly used in cosmetics, as necessary, within a quantitative and qualitative range that does not impair the effects of the present invention. For example, it may contain oily components, surfactants other than component (B), powders other than component (A), water-soluble polymers other than component (B), aqueous components such as moisturizers, antioxidants, cosmetic ingredients, preservatives, fragrances, cooling agents, etc.

[0052] Oily components include, for example, solid oils, semi-solid oils, liquid oils, and volatile oils of animal origin, vegetable oils, synthetic oils, etc., regardless of their properties, such as solid oils, semi-solid oils, liquid oils, and volatile oils, as well as hydrocarbons, fats and oils, hydrogenated oils, ester oils, fatty acids, higher alcohols, silicone oils, fluorinated oils, and lanolin derivatives. Specifically, examples include hydrocarbons such as liquid paraffin, squalane, polyisobutylene, and polybutene; fats and oils such as olive oil, castor oil, mink oil, and macadamia nut oil; jojoba oil, cetyl 2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, diglyceryl isostearate, diglyceryl diisostearate, diglyceryl triisostearate, diglyceryl tetraisostearate, isotridecyl isononanoate, isostearyl lactate, octyldodecyl lactate, and oleopropyl lactate. Iol, stearyl lactate, diisostearyl malate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, pentaerythritol rosinate, neopentyl glycol dioctanoate, neopentyl glycol dioctanoate, cholesterol fatty acid esters, phytosterol fatty acid esters and other esters, fatty acids such as stearic acid, lauric acid, myristic acid, behenic acid, isostearic acid, oleic acid, stearyl alcohol, ceti Examples of suitable materials include higher alcohols such as methyl alcohol, lauryl alcohol, oleyl alcohol, isostearyl alcohol, and behenyl alcohol; high-molecular-weight methylphenylpolysiloxane, cross-linked methylpolysiloxane, polyoxy-modified organopolysiloxane, cross-linked polyether-modified methylpolysiloxane, methacrylic-modified polysiloxane, stearyl-modified methylpolysiloxane, oleyl-modified methylpolysiloxane, behenyl-modified methylpolysiloxane, polyvinylpyrrolidone-modified methylpolysiloxane, high-molecular-weight dimethylpolysiloxane, polyoxyalkylene-alkylmethylpolysiloxane-methylpolysiloxane copolymer, alkoxy-modified polysiloxane, and fluorine-modified polysiloxane; fluorinated oils such as perfluorodecane, perfluorooctane, and perfluoropolyether; and lanolin derivatives such as lanolin, lanolin acetate, isopropyl lanolin fatty acid, and lanolin alcohol. One or more of these can be used.Examples include ester oils, silicone oils, natural oils, hydrocarbon oils, higher fatty acids, and higher alcohols. In the present invention, when an oily component is included, the content of the oily component is not particularly limited, but it is preferably 10-80%, more preferably 15-75%, and even more preferably 20-70% in the sunscreen cosmetic.

[0053] The surfactant is not particularly limited as long as it is a surfactant commonly used in cosmetics, and nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, etc., can be used. Examples include glycerin fatty acid esters and their alkylene glycol adducts, polyglycerin fatty acid esters and their alkylene glycol adducts, sorbitan fatty acid esters and their alkylene glycol adducts, polyoxyethylene hydrogenated castor oil, polyoxyalkylene alkyl copolymerized organopolysiloxanes, polyether-modified organopolysiloxanes, lecithin, and the like.

[0054] The aqueous component can be any component that is soluble in water, and in addition to water, examples include alcohols such as ethyl alcohol, glycols such as propylene glycol, 1,3-butylene glycol, dipropylene glycol, tripropylene glycol, and polyethylene glycol, glycerols such as glycerin, diglycerin, and polyglycerin, and plant extracts such as aloe vera, witch hazel, witch hazel, cucumber, lemon, lavender, and rose.

[0055] The present invention can be manufactured using generally known methods, and any general dispersion and emulsification equipment such as a dispersion machine can be used as the manufacturing equipment. For example, it can be manufactured by uniformly mixing a dispersion obtained by uniformly dispersing component (A) in a three-roll mill with a liquid oil, and then adding and mixing an aqueous portion containing component (B).

[0056] The formulation of the sunscreen cosmetic of the present invention is not particularly limited. Examples include oil-based, water-in-oil, and oil-in-water formulations, and among these, the water-in-oil formulation is preferred because it more effectively exhibits the effects of the present invention.

[0057] The form of the sunscreen cosmetic of the present invention is not particularly limited and includes, for example, liquid, emulsion, cream, gel, solid, aerosol mist, aerosol spray, etc. Examples of applications include, in addition to sunscreen, skincare cosmetics such as daytime serums and body creams, makeup cosmetics such as foundations, makeup bases, face colors, color correctors, concealers, BB creams, CC creams, lip balms, and eyeshadows, and out-of-bath hair cosmetics such as hair mists and hair essences. In particular, skincare cosmetics such as sunscreens and daytime serums, and makeup cosmetics such as foundations, makeup bases, face colors, BB creams, and CC creams are preferred in order to obtain the effects of the present invention.

[0058] 2. Second Embodiment According to the Present Invention

[0059] This second embodiment provides a method for suppressing the elution of zinc oxide and / or titanium dioxide after use, a method for suppressing the elution of zinc oxide and / or titanium dioxide into seawater, a method for suppressing the elution of zinc oxide and / or titanium dioxide by the formation of insoluble salts, a method for suppressing the elution of zinc oxide and / or titanium dioxide by contact with seawater, and a method for suppressing the elution of zinc oxide and / or titanium dioxide by improving film strength, etc., when using component (A) and component (B), or a combination thereof or a mixture thereof, the sunscreen cosmetic of this first embodiment, etc. on the skin. The aforementioned use is not particularly limited, but is preferably by application, rubbing, massage, spraying, etc., to the skin. The area of ​​application to the skin is not particularly limited as long as it is skin, but is preferably one or more selected from the whole body, scalp, face, arms, legs, hands, etc. Furthermore, the user may be a professional practitioner such as a massage therapist, esthetician, or beautician, or a general user or end user. The amount of the aforementioned sunscreen cosmetic used or applied to the target area is not particularly limited, but is generally between 1 and 10 mg / cm³. 2 Preferably, 1 to 5 mg / cm³ 2 More preferably, 1-3 mg / cm³ 2 More preferably, 2 mg / cm³ 2 That is particularly preferable.

[0060] In describing the method of this second embodiment, explanations of components (A), components (B), their respective contents, their respective mass ratios, manufacturing methods, their respective configurations, their respective methods, and their respective terms, which overlap with the explanations in "1. First Embodiment According to the Present" and "3. Third Embodiment According to the Present" below, will be omitted as appropriate. However, the explanations in "1. First Embodiment According to the Present" and "3. Third Embodiment According to the Present" below also apply to this second embodiment and can be adopted as appropriate.

[0061] 3. Third Embodiment According to the Present Invention

[0062] This third embodiment can provide a zinc oxide and / or titanium dioxide elution inhibitor, a zinc oxide and / or titanium dioxide elution inhibitor into seawater, a zinc oxide and / or titanium dioxide elution inhibitor by insoluble salt formation, a zinc oxide and / or titanium dioxide elution inhibitor by contact with seawater, and a zinc oxide and / or titanium dioxide elution inhibitor by improving film strength, which can be used in sunscreen compositions or sunscreen cosmetics. Furthermore, component (B) can be used as a zinc oxide and / or titanium dioxide elution inhibitor, a zinc oxide and / or titanium dioxide elution inhibitor into seawater, a zinc oxide and / or titanium dioxide elution inhibitor by insoluble salt formation, a zinc oxide and / or titanium dioxide elution inhibitor by contact with seawater, and a zinc oxide and / or titanium dioxide elution inhibitor by improving film strength. The agent of this third embodiment is more preferably added to the sunscreen composition or sunscreen cosmetic at a concentration of 10-50%, and it is more preferably added so that the total amount of component (A) and component (B) in the sunscreen composition or sunscreen cosmetic is 10-50%.

[0063] In describing the agent of this third embodiment, explanations of component (A), component (B), their respective contents, their respective mass ratios, manufacturing methods, their respective compositions, their respective methods, and their respective terms, which overlap with the explanations of "1. First Embodiment According to the Present Invention" and "2. Second Embodiment According to the Present Invention" described above, will be omitted as appropriate. However, the explanations of "1. First Embodiment According to the Present Invention" and "2. Second Embodiment According to the Present Invention" described above also apply to this third embodiment and can be adopted as appropriate. Content and mass ratio may also be expressed as usage amount and usage mass ratio. Furthermore, a composition containing the agent of this third embodiment, preferably such a composition, can be provided as a cosmetic or a topical skin preparation. It is preferable to include or blend the agent of this third embodiment in such a way that the content and mass ratio of component (A) and component (B) in the composition described in "1. First Embodiment According to the Present Invention" are the same. [Examples]

[0064] The present technology will be described in more detail below based on examples and other relevant information. The examples and other relevant information described below are merely representative examples of the present technology and should not be interpreted as narrowing the scope of the present technology.

[0065] Examples 1-10 and Comparative Examples 1-10: Water-in-oil sunscreen creams Water-in-oil sunscreen creams with the compositions shown in Tables 1 and 2 were prepared using the following manufacturing method. Each of the following items was evaluated and judged according to the evaluation method and criteria shown below: a. UV protection effect, b. Seawater resistance, c. No feeling of burden on the applied film, and d. Inhibition of metal ion elution effect. The results are also shown in Tables 1 and 2.

[0066] [Table 1]

[0067] [Table 2]

[0068] *1: MZX-304OTS (manufactured by Teika Co., Ltd.) (average particle size 35nm) *2: MT-01 (manufactured by Teika Co., Ltd.) (average particle size 10 nm) *3: XZ-300F (manufactured by Sakai Chemical Industry Co., Ltd.) (average particle size 300nm) *4:OTS-MP1133 (manufactured by Daito Kasei Kogyo Co., Ltd.) (average particle size 250nm) *5: MZ-300 (manufactured by Teika Co., Ltd.) (average particle size 35nm) *6: A3189 (manufactured by Teika Corporation) (average particle size 15nm) *7: Snow Algin M (manufactured by Fuji Chemical Industries Co., Ltd.) *8: Nikkor SMT (manufactured by Nikko Chemicals Co., Ltd.) *9: Amisoft LS-11 (manufactured by Ajinomoto Co., Inc.) *10: SR1000 (manufactured by Momentive Performance Materials) *11: KP-545 (30% polymer content, manufactured by Shin-Etsu Chemical Co., Ltd.) *12: CITHROL DPHS (manufactured by Croda) *13: KF-6028P (manufactured by Shin-Etsu Chemical Co., Ltd.) *14: Godball E-90C (manufactured by Suzuki Oil & Fat Industry Co., Ltd.)

[0069] (Manufacturing method) A: Components (1) to (6) and components (14) to (18) are uniformly dispersed using a three-roll mill. B: Mix ingredients (19) to (22) uniformly at 80°C. C: Mix components (7) to (13) and components (23) to (26) uniformly at 70°C. D: At 25℃, B was added and mixed in the order of A and C while stirring to obtain a water-in-oil sunscreen cream.

[0070] (Evaluation criteria) I. UV protection effect b. Seawater resistance H. The coating film does not feel burdensome. II. Effect of suppressing the elution of metal ions

[0071] [I. UV protection effect] Each sample was placed on a PMMA plate (HELIOPLATE HD6, Labsphere) at a concentration of 2 mg / cm². 2 After applying the required amount with a finger, the sample was left to stand for 20 minutes. SPF simulation measurements were then performed using an SPF analyzer (UV-2000S, Labsphere), and the SPF simulation value was measured. Based on the obtained SPF simulation values, the UV protection effect was evaluated according to the following criteria.

[0072] [3-stage evaluation criteria] (Judgment criteria) : (Judgment) SPF simulation value of 50 or higher: ◎ (Excellent) SPF simulation value of 30 or higher, less than 50: ○ (Good) SPF simulation value less than 30: × (Not allowed)

[0073] [b. Seawater resistance] Each sample was placed on a PMMA plate (HELIOPLATE HD6, Labsphere) at a concentration of 2 mg / cm². 2 After applying the required amount with a finger, the sample was left to stand for 20 minutes. SPF simulation measurements were then performed using an SPF analyzer (UV-2000S, Labsphere), and the SPF simulation value was measured. Next, a seawater bath test was conducted. For the seawater, 108g of artificial seawater mix (manufactured by GEX) was dissolved in 3000g of purified water. The seawater bath conditions were as follows: at a room temperature of 25°C, the coated sample was attached to the side of a container (14cm in diameter x 15cm in height) containing 2L of seawater, and the seawater in the container was stirred at 300rpm for 5 minutes using a paddle mixer. After stirring, the coated sample was removed from the container and allowed to stand and dry for 20 minutes under conditions of 25°C and 60% humidity. Then, the SPF simulation value after the seawater bath was measured using the SPF analyzer. Based on the obtained SPF simulation values ​​before and after the seawater bath, the seawater resistance was determined according to the following criteria.

[0074] [4-level evaluation criteria] (Judgment criteria) : (Judgment) (SPF measurement after swimming) / (SPF measurement before swimming) = 0.9 or higher: ◎ (Excellent) (SPF measurement after swimming) / (SPF measurement before swimming) = 0.7 or higher, less than 0.9: ○ (Good) (SPF measurement after swimming) / (SPF measurement before swimming) = 0.5 or higher, less than 0.7: △ (Somewhat unsuitable) (SPF measurement after swimming) / (SPF measurement before swimming) = less than 0.5: × (Not allowed)

[0075] [H. The coating film does not feel burdensome.] Ten women in their 20s to 40s, trained in sensory evaluation and capable of evaluating according to a set standard, were selected as a cosmetics expert panel. Each 0.5g sample was evaluated by the cosmetics expert panel at 2mg / cm³. 2 The product was applied to the skin in the following manner, and after drying, the feeling of no burden on the skin was scored using the following 5-point absolute evaluation scale. For each sample, the average score was calculated from the sum of the scores of all panel members, and the result was evaluated according to the following 4-point evaluation criteria.

[0076] [Absolute evaluation criteria] (Rating) : (Evaluation) 4 points: No feeling of burden 3 points: I hardly feel any burden. 2 points: I feel burdened. 1 point: I feel very burdened.

[0077] [4-level evaluation criteria] (Average score): (Judgment) 3.2 points or higher: ◎ (Excellent) 2.8 points or higher, less than 3.2 points: ○ (Good) 1.6 points or higher, less than 2.8 points: △ (Slightly Poor) 1.6 points or less: × (Poor)

[0078] [II. Effect of suppressing the elution of metal ions] To assess the effect of suppressing the elution of metal ions, 100 mg of each sample was uniformly applied by finger to a 10 cm x 5 cm area on a glass plate (20 cm wide, 10 cm long, 0.5 cm thick), and left to stand for 12 hours to create a coated sample. The coated sample was attached to the side of a glass tank (68 L capacity, 65 cm wide x 30 cm long x 35 cm high) containing 50 L of seawater (1800 g of artificial seawater mix (manufactured by GEX) dissolved in 50 kg of purified water), and the seawater in the container was stirred at 50 rpm using a paddle mixer for one week. 20 mL of the stirred seawater was taken and centrifuged at 50,000 rpm for 30 minutes using an ultracentrifuge (CS100FNX: manufactured by Eppendorf Hi-Mac Technologies, Inc.) to allow insoluble matter to settle. 5 mL of the supernatant after centrifugation was collected, and zinc and titanium ions were quantified using ICP-OES (Optima 5300DV: PerkinElmer). Based on the obtained quantification values, the metal ion concentration in the seawater (total of zinc and titanium ion concentrations) was calculated, and the effect of suppressing metal ion elution was evaluated according to the following criteria. The following criteria were determined based on the zinc ion concentration of 0.1 ppm in seawater, which significantly adversely affected the growth of Stylophora pistillata, a type of hard coral, in the experiment described in Reference 1. A concentration of less than 0.05 ppm was preferred, and less than 0.01 ppm was considered even more preferred.

[0079] [4-level evaluation criteria] (Evaluation) : (Judgment) Metal ion concentration in seawater = less than 0.01 ppm: ◎ (Excellent) Metal ion concentration in seawater = 0.01 ppm or higher and less than 0.05 ppm: ○ (Good) Metal ion concentration in seawater = 0.05 ppm or higher and less than 0.1 ppm: △ (Somewhat unacceptable) Metal ion concentration in seawater = 0.1 ppm or higher: × (Not acceptable)

[0080] As is clear from Tables 1 and 2, the water-in-oil sunscreen creams of Examples 1 to 10 of the present invention were excellent in all aspects, including "ultraviolet protection effect," "seawater resistance," "lack of burden on the applied film," and "inhibition of metal ion elution effect."

[0081] In contrast, Comparative Example 1, in which the content of component (A) exceeded 40%, showed excellent UV protection, but did not yield satisfactory results in terms of seawater resistance, lack of burden on the coating film, and suppression of metal ion elution. On the other hand, Comparative Example 2, in which the content of component (A) was less than 10%, did not yield satisfactory UV protection. Furthermore, Comparative Example 3, in which zinc oxide and titanium oxide with an average particle size of 100 nm or more were used instead of component (A), did not yield satisfactory results in terms of UV protection and lack of burden on the coating film. Furthermore, Comparative Example 4, in which unhydrophobized zinc oxide and titanium oxide with an average particle size of less than 100 nm were used instead of component (A), did not yield satisfactory results in terms of UV protection, lack of burden on the coating film, and suppression of metal ion elution. In Comparative Examples 5 or 6, which used agarose or dextran, which have high gelling performance and readily form films, instead of component (B), and in Comparative Examples 7 and 8, which used neutralized (sodium salt form) carbomer or (acrylates / alkyl acrylate) crosspolymer, satisfactory results were not obtained in terms of seawater resistance and suppression of metal ion elution. Furthermore, in Comparative Examples 9 and 10, which used trimethylsiloxysilicate or acrylate silicone, which are commonly used as oil-soluble film-forming agents, instead of component (B), satisfactory results were not obtained in terms of seawater resistance, lack of burden on the coated film, and suppression of metal ion elution.

[0082] Example 11: Water-in-oil sunscreen lotion (component) (mass%) (1) Isopropyl titanium triisostearate-treated zinc oxide microparticles (Average particle size: 25nm) *15 18 (2) Dimethicone / hydrogen dimethicone treated titanium dioxide fine particles (Average particle diameter: 10 nm) *16 10 (3) Polyhydroxystearic acid 0.4 (4) Propylene glycol dicaprate 5 (5) Dimethicone (kinematic viscosity at 25°C 6 mm 2 / s) 5 (6) Methyltrimethicone 3 (7) Decamethylcyclopentasiloxane 15 (8) Lauryl PEG-9 polydimethylsiloxyethyl dimethicone *17 1.5 (9) Neopentyl glycol diethylhexanoate 5 (10) Decyl tetradecanol 5 (11) Isononyl isononanoate 1 (12) Methylphenyl polysiloxane 3 (13) (PEG-15 / lauryl dimethicone) Crosspolymer *18 5 (14) Spherical PMMA *19 3 (15) Fragrance 0.03 (16) Purified water balance (17) Sodium alginate *7 0.1 (18) 1,3-Butylene glycol 5 (19) Sodium chloride 0.1 (20) Ethanol 2 [[ID=4又]](21) Phenoxyethanol 0.05 *15: ITT MZ-500 (manufactured by Daito Kasei Kogyo Co., Ltd.) *16: MTY-110M3S (manufactured by Teika Co., Ltd.) *17: KF-6038 (manufactured by Shin-Etsu Chemical Co., Ltd.) *18: KSG-310 (polymer pure content 30%, manufactured by Shin-Etsu Chemical Co., Ltd.) *19: Matsumoto Microsphere M311 (manufactured by Matsumoto Yushi Seiyaku Co., Ltd.)

[0083] (Manufacturing method) A: Components (1) to (6) are uniformly dispersed by a three-roll mill. B: Components (7) to (15) are uniformly mixed at room temperature. C: Mix components (16) to (21) uniformly at room temperature. D: At 25℃, B was stirred while adding A and then C in that order to obtain a water-in-oil sunscreen lotion.

[0084] The water-in-oil sunscreen lotion of Example 11 demonstrated excellent "UV protection effect," "seawater resistance," "lightness of the applied film," and "inhibition of metal ion elution."

[0085] Example 12: Oil-in-water sunscreen cream (component) (mass%) (1) Dimethicone / octylsilylated zinc oxide microparticles (Average particle size: 25nm) *20 12 (2) Stearic acid-treated titanium dioxide microparticles (Average particle size: 7nm) *21 4 (3) Polyhydroxystearic acid 0.3 (4) (Dimethicone / Vinyl Dimethicone) Crosspolymer *22 1 (5) Di(caprylic / capric acid) PG 5 (6) Isotridecyl isononanoate 5 (7) Tri(caprylic / capric acid)glyceryl 3 (8) PEG-80 Hydrogenated Castor Oil *23 1 (9) Sorbitan sesquioleate *24 0.2 (10) Cetostearyl alcohol 0.3 (11) Behenyl alcohol 0.3 (12) Glycerin fatty acid ester 0.3 (13) (Sodium Acrylate / Sodium Acryloyldimethyl Taurate) Copolymer *25 1 (14) Xanthan gum 0.1 (15) Carbomer *26 0.1 (16)(Acrylates / C10-30 Alkyl Acrylate) Crosspolymer *27 0.1 (17) Purified water remaining amount (18) Sodium myristoyl methyl taurate *28 0.1 (19) Spherical polymethylsilsesquioxane *29 1 (20) Ethanol 5 (21) 1,3-Butylene glycol 5 (22) Water-dispersible zinc oxide *30 8 (23) Phenoxyethanol 0.05 (24) Purified water 5 *20: SALT MZ-500 (manufactured by Miyoshi Chemical Co., Ltd.) *21: MT-N1 (manufactured by Teika Co., Ltd.) *22: KSG-16 (25% polymer content, manufactured by Shin-Etsu Chemical Co., Ltd.) *23: HCO-80 (manufactured by Nikko Chemicals Co., Ltd.) *24: Leodor AO-15V (manufactured by Kao Corporation) *25: SIMULGEL EG (polymer purity 37.5%, manufactured by SEPPIC) *26: CARBOPOL 980 (manufactured by LUBRIZOL) *27: CARBOPOL 1382 (manufactured by LUBRIZOL) *28: Nikkor MMT (manufactured by Nikko Chemicals Co., Ltd.) *29: TOSPEARL 3000A (manufactured by LUBRIZOL) *30: MZX-304OTSW (manufactured by Teika Co., Ltd.)

[0086] (Manufacturing method) A: Components (1) to (5) are uniformly dispersed using a three-roll mill. B: Mix A and ingredients (6) to (12) uniformly at 80°C. C: Mix components (13) to (18) uniformly at 80°C. D: Mix ingredients (19) to (24) uniformly at room temperature. E: Add B to C while stirring at 80°C and emulsify. After cooling F:E to 40°C, D was added while stirring to obtain an oil-in-water type sunscreen cream.

[0087] The oil-in-water sunscreen cream of Example 12 exhibited excellent "UV protection effect," "seawater resistance," "lightness of the applied film," and "inhibition of metal ion elution."

[0088] Example 13: Oil-based solid sunscreen stick (component) (mass%) (1) Hydrogen dimethicone / isostearate / hydrated silica-treated zinc oxide microparticles (Average particle size: 25nm) *30 15 (2) Silica / aluminum hydroxide treated titanium dioxide fine particles (Average particle size: 10nm) *31 10 (3) (Acrylates / Ethylhexyl Acrylate / Dimethicone Methacrylate) Copolymer *32 0.5 (4) (Ethylene / Propylene) Copolymer *33 3 (5) Silylated fumes of silica *34 1 (6) Diglyceryl triisostearate 10 (7) Diisostearyl malate 3 (8) Isononyl isononanoate 5 (9) Sodium stearoyl glutamate *35 0.1 (10) Synthetic wax *36 7 (11) Microcrystalline wax *37 1 (12) Candelilla Low *38 0.5 (13) Carnauba wax *39 0.5 (14) Glyceryl tri-2-ethylhexanoate *7 remaining amount (15) Ethylhexyl palmitate *40 5 (16) Cyclomethicone 15 (17) Methylphenylpolysiloxane *41 5 (18) Liquid paraffin *42 5 (19) Methyl methacrylate crosspolymer *43 5 (20) Spherical silica *44 3 (21) Phenoxyethanol 0.1 (22) Dibutylhydroxytoluene 0.02 *30: MZY-500SHE (manufactured by Teika Co., Ltd.) *31: MT-05 (manufactured by Teika Co., Ltd.) *32: KP-578P (manufactured by Shin-Etsu Chemical Co., Ltd.) *33: EPS wax (manufactured by Japan Natural Products Co., Ltd.) *34: AEROSIL R972 (manufactured by Nippon Aerosil Co., Ltd.) *35: Amisoft HS-11P (manufactured by Ajinomoto Co., Inc.) *36: CIREBELLE 109L (manufactured by CIREBELLE) *37: MULTIWAX W445 (manufactured by SONNNEBORN) *38: Refined Candelilla Wax SR-3 (manufactured by Nippon Natural Products Co., Ltd.) *39: TOWAX-1F3 (manufactured by Toa Chemical Co., Ltd.) *40: PALMESTER 1543 (manufactured by PALM OLEO) *41: KF-56 (manufactured by Shin-Etsu Chemical Co., Ltd.) *42: KLEAROL (manufactured by SONNNEBORN) *43: Matsumoto Microsphere M305 (manufactured by Matsumoto Oil & Fat Pharmaceutical Co., Ltd.) *44: Silysia 550 (manufactured by Fuji Silysia Chemical Co., Ltd.)

[0089] (Manufacturing method) A: Components (1) to (9) are heated and melted at 90°C, then uniformly dispersed using a three-roll mill. B: Add ingredients (10) to (22) to A, and heat to 90°C to dissolve. At 90°C, B was poured into a stick container and cooled to 5°C to obtain an oil-based solid sunscreen stick.

[0090] The oil-based solid sunscreen stick of Example 13 demonstrated excellent "UV protection effect," "seawater resistance," "lightness of the applied film," and "inhibition of metal ion elution."

[0091] Example 14: Water-in-oil sunscreen foam (aerosol) (component) (mass%) (1) Hydrogen dimethicone-treated zinc oxide microparticles (Average particle size: 35nm) *45 16 (2) Octylsilylated titanium dioxide fine particles (Average particle size: 15nm) *46 5 (3) PEG-9 polydimethylsiloxyethyl dimethicone *13 0.5 (4) Cetyl 2-ethylhexanoate 5 (5) Cyclomethicone 2 (6) Red 226 0.1 (7) Titanium mica *47 1 (8) Alkyl (C12-15) benzoate 5 (9) Isopropyl myristate 3 (10) Dioctyl succinate 10 (11) Neopentyl glycol diethylhexanoate 5 (12) Cetyl 2-ethylhexanoate remaining amount (13) Cyclomethicone 15 (14) (Dimethicone / Polyglycerin-3) Crosspolymer *48 3 (15) Talc 5 (16) Nylon - 12 * 49 3 (17) Purified water 10 (18) Ethanol 5 (19) 1,3-Butylene glycol 4 (20) Sodium myristoyl glutamate *50 0.1 *45: FINEX-30S-LPT (manufactured by Sakai Chemical Industry Co., Ltd.) *46: STR-100W-OTS (manufactured by Sakai Chemical Industry Co., Ltd.) *47: FLAMENCO RED (manufactured by Shin-Etsu Chemical Co., Ltd.) *48: KSG-710 (24% polymer content, manufactured by Shin-Etsu Chemical Co., Ltd.) *49: Orgasol 2002D (manufactured by Arkema) *50: Amisoft MS-11 (manufactured by Ajinomoto Co., Inc.)

[0092] (Manufacturing method) A: Components (1) to (7) are uniformly dispersed using a three-roll mill. B: Add ingredients (8) to (16) to A and mix uniformly. C: Mix components (17) to (20) uniformly at room temperature. D:C was added to B and mixed uniformly to obtain a water-in-oil emulsion type sunscreen concentrate. After filling 90g of the cosmetic concentrate obtained in E:D into a pressure vessel, the valve was fixed in place, and 10g of LPG 0.15 was filled into the pressure vessel through the valve to obtain a water-in-oil sunscreen foam (aerosol).

[0093] The water-in-oil sunscreen foam (aerosol) of Example 14 exhibited excellent "UV protection effect," "seawater resistance," "lightness of the applied film," and "inhibition of metal ion elution."

Claims

1. (A) Hydrophobically treated zinc oxide and / or titanium oxide with an average particle size of less than 100 nm, 10 to 40% by mass (B) One or more selected from the group consisting of monovalent alkali metal salts of alginate, monovalent alkali metal salts of myristoyl methyl taurine, monovalent alkali metal salts of lauroyl methyl taurine, monovalent alkali metal salts of myristoyl glutamate, monovalent alkali metal salts of lauroyl glutamate, monovalent potassium salt of stearoyl methyl taurine, and monovalent potassium salt of stearoyl glutamate. It contains, A sunscreen cosmetic that substantially does not contain an organic ultraviolet absorber, wherein the content of component (B) is 0.01 to 1% by mass in the sunscreen cosmetic.

2. The sunscreen cosmetic composition according to claim 1, wherein the mass ratio (A) / (B) of component (A) to component (B) is 10 to 3000.

3. Place 2g of the sunscreen cosmetic on a glass plate at a rate of 1000cm ２ The sunscreen cosmetic composition according to claim 1 or 2, wherein after being applied to the area and dried, the concentration of zinc ions and / or titanium ions in the seawater after being immersed in 50 L of seawater for one week is less than 0.1 ppm.

4. (A) Hydrophobically treated zinc oxide and / or titanium oxide with an average particle size of less than 100 nm, 10 to 40% by mass (B) One or more selected from the group consisting of monovalent alkali metal salts of alginate, monovalent alkali metal salts of myristoyl methyl taurine, monovalent alkali metal salts of lauroyl methyl taurine, monovalent alkali metal salts of myristoyl glutamate, monovalent alkali metal salts of lauroyl glutamate, monovalent potassium salt of stearoyl methyl taurine, and monovalent potassium salt of stearoyl glutamate. It contains, A sunscreen cosmetic that substantially does not contain an organic ultraviolet absorber, wherein the mass ratio (A) / (B) of component (A) to component (B) is 10 to 3000.

5. (A) Hydrophobically treated zinc oxide and / or titanium oxide with an average particle size of less than 100 nm, 10 to 40% by mass (B) One or more monovalent alkali metal salts selected from the group consisting of alginic acid, acylmethyltaurine, and acylglutamic acid. It contains, When component (A) includes zinc oxide, the ratio of zinc oxide in component (A) to component (B), which is the ratio of zinc oxide in component (A) to component (B), is 100 to 2000, and A sunscreen cosmetic that substantially does not contain an organic ultraviolet absorber, wherein, when component (A) contains titanium dioxide, the mass ratio of titanium dioxide in component (A) to component (B), i.e., titanium dioxide in component (A) / (B), is 60 to 1000.

6. A method for suppressing the elution of metal ions from a composition containing component (A) using the following component (B): A method for suppressing the elution of metal ions, wherein the content of component (B) is 0.01 to 1% by mass in the composition. (A) Hydrophobically treated zinc oxide and / or titanium oxide with an average particle size of less than 100 nm. (B) One or more selected from the group consisting of monovalent alkali metal salts of alginate, monovalent alkali metal salts of myristoyl methyl taurine, monovalent alkali metal salts of lauroyl methyl taurine, monovalent alkali metal salts of myristoyl glutamate, monovalent alkali metal salts of lauroyl glutamate, monovalent potassium salt of stearoyl methyl taurine, and monovalent potassium salt of stearoyl glutamate.

7. The method for suppressing the elution of metal ions according to claim 6, wherein the composition is a sunscreen cosmetic.

8. An inhibitor of metal ion elution from a composition containing component (A) using the following component (B): A metal ion elution inhibitor wherein the content of component (B) is 0.01 to 1% by mass in the composition. (A) Hydrophobically treated zinc oxide and / or titanium oxide with an average particle size of less than 100 nm. (B) One or more selected from the group consisting of monovalent alkali metal salts of alginate, monovalent alkali metal salts of myristoyl methyl taurine, monovalent alkali metal salts of lauroyl methyl taurine, monovalent alkali metal salts of myristoyl glutamate, monovalent alkali metal salts of lauroyl glutamate, monovalent potassium salt of stearoyl methyl taurine, and monovalent potassium salt of stearoyl glutamate.

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