Cosmetic composition

Abstract

The present invention provides a cosmetic composition that exhibits excellent UV protection and visible light transmission when applied to the skin. [Solution] The cosmetic composition of the present invention is characterized by comprising silicon element or a silicon compound containing 80 atomic percent or more of silicon, and comprising particles (A) with an average particle diameter of 5 nm or more and less than 80 nm, and an ultraviolet shielding agent other than the particles (A).

Description

Technical Field

[0001] The present invention relates to a cosmetic composition that can exhibit excellent ultraviolet shielding ability and visible light transmittance when applied to the skin.

Background Art

[0002] In various cosmetics such as sunscreen applied to the skin, those containing inorganic powders such as zinc oxide and titanium oxide are known (Patent Documents 1 to 3, etc.).

[0003] Also, recently, a nanoparticle film with high concealability of visible light, containing inorganic nanoparticles with a refractive index of 3 or more such as Si nanoparticles, has been developed, and it has also been proposed to use this for coloring applications of cosmetics (Patent Document 4).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the above-mentioned cosmetics, for example, when increasing the blending amount of inorganic powder to enhance the ultraviolet shielding ability, the texture such as the spreadability when applying the cosmetics to the skin may be impaired, or in the case of an emulsion cosmetic, its emulsion stability may be impaired. Therefore, in cosmetics containing an ultraviolet shielding agent, there is also a demand for the development of a technology to enhance the ultraviolet shielding ability by a method other than simply increasing the amount of the ultraviolet shielding agent.

[0006] The present invention has been made in view of the above circumstances, and its object is to provide a cosmetic composition that can exhibit excellent ultraviolet shielding ability and visible light transmittance when applied to the skin. [Means for solving the problem]

[0007] The cosmetic composition of the present invention is characterized by comprising silicon element or a silicon compound containing 80 atomic percent or more of silicon, and containing particles (A) with an average particle diameter of 5 nm or more and less than 80 nm, and an ultraviolet shielding agent other than the particles (A). [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a cosmetic composition that exhibits excellent ultraviolet shielding ability and visible light transmittance when applied to the skin. [Modes for carrying out the invention]

[0009] Particles of elemental silicon or silicon compounds containing 80 atomic percent or more of silicon have a refractive index of 3.5 or higher, which is higher than that of titanium dioxide (refractive index: 2.7) and zinc oxide (refractive index: 2.0), inorganic materials commonly used in cosmetic compositions. The inventors have discovered that by adjusting and controlling the particle size of elemental silicon or silicon compounds containing 80 atomic percent or more of silicon, ultraviolet light can be effectively scattered and shielded, and visible light can be transmitted well, thus completing the present invention.

[0010] In other words, the cosmetic composition of the present invention comprises silicon element or a silicon compound containing 80 atomic percent or more of silicon, and is formulated with particles (A) having an average particle diameter of 5 nm or more and less than 80 nm. In the cosmetic composition, particles (A) function as an ultraviolet shielding agent, and are particularly excellent at shielding ultraviolet A rays (UVA) and ultraviolet B rays (UVB).

[0011] In this specification, "ultraviolet shielding agent" refers to a material that has the function of shielding ultraviolet (UV) rays in the wavelength range of 100 to 400 nm. Furthermore, "function of shielding ultraviolet A rays (UVA)" refers to the function of shielding UV A rays in the wavelength range of 320 to 400 nm, and "function of shielding ultraviolet B rays (UVB)" refers to the function of shielding UV B rays in the wavelength range of 280 to 320 nm. Note that the ultraviolet rays that particles (A) can shield also include ultraviolet C rays (UVC) in wavelength ranges other than UVA and UVB (100 to 280 nm).

[0012] The constituent elements of particle (A) may be pure silicon, or they may be compounds containing silicon and other elements (for example, at least one element selected from the group consisting of boron, carbon, nitrogen, oxygen, fluorine, sodium, magnesium, aluminum, phosphorus, sulfur, chlorine, scandium, titanium, chromium, vanadium, manganese, iron, cobalt, nickel, copper, zinc, gallium, germanium, arsenic, selenium, yttrium, zirconium, niobium, molybdenum, silver, indium, lanthanum, tantalum, tungsten, tin, tellurium, and antimony), in which the proportion of silicon is 80 atomic percent or more. That is, if the constituent elements of particle (A) are silicon compounds, then the silicon compound is Si a X b (wherein X is at least one element selected from the group consisting of B, C, N, O, F, Na, Mg, Al, P, S, Cl, Sc, Ti, Cr, V, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Y, Zr, Nb, Mo, Ag, In, La, Ta, W, Sn, Te, and Sb, and is represented by the empirical formula a+b=1, a≧0.8).

[0013] Particle (A) may be crystalline or amorphous, or a mixture of crystalline and amorphous parts. However, if the crystallinity is low and it approaches amorphous, it will absorb visible light, which may reduce the transparency of the cosmetic composition when applied to the skin. Therefore, it is more preferable that the particle (A) is crystalline.

[0014] In this context, "crystal" means that the atoms forming the elemental silicon or silicon compound containing 80 atomic percent or more of silicon that constitute particle (A) are arranged in an aligned manner. The elemental silicon or silicon compound containing 80 atomic percent or more of silicon adopts a cubic crystal structure, but a diamond structure is preferred.

[0015] If particles (A) are too small, their structure approaches amorphous, causing them to absorb visible light, which reduces the transparency of the cosmetic composition when applied to the skin. Conversely, if particles (A) are too large, their ability to scatter visible light increases rapidly, which may also reduce the transparency of the cosmetic composition when applied to the skin. Therefore, from the viewpoint of ensuring a good balance between UV absorption capacity and visible light transmittance, the average particle diameter of particles (A) is preferably 5 nm or more, preferably 20 nm or more, more preferably 30 nm or more, and preferably less than 80 nm and 70 nm or less.

[0016] In this specification, the average particle diameter of particle (A) is defined as the particle diameter of 50% of the volume-based particle size distribution, obtained by measuring the particle size distribution obtained from 500 primary particle images of particle (A) obtained by observing them at 100,000x magnification using a transmission electron microscope, using image analysis-based particle size distribution measurement software. 50 This refers to the median diameter. The values ​​shown in the examples below were obtained using a JEOL Ltd. "JEM-1230" transmission electron microscope and Mountec Co., Ltd. "Mac-View" image analysis particle size distribution measurement software.

[0017] Particles (A) are commercially available, for example, from Almedio, and such commercially available particles (A) can be used in cosmetic compositions.

[0018] The particles (A) incorporated into the cosmetic composition may be surface-treated. Examples of surface treatments for particles (A) include coating with an inorganic compound containing at least one element selected from the group consisting of aluminum, magnesium, calcium, silicon, zinc, titanium, zirconium, iron, cerium, and tin; and coating with at least one organic compound selected from the group consisting of fatty acids and their salts, silicone compounds, coupling agents, and fluorine compounds. For the organic compound coating, it is preferable to use one or more compounds selected from silicone oils, fatty acids, and alkylsilanes. Examples of silicone oils include so-called straight silicone oils such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane, and so-called branched silicone oils such as trimethylsiloxysilicate and triethoxysilylethylpolydimethylsiloxyethylhexyldimethicone. Examples of fatty acids include stearic acid, isostearic acid, lauric acid, myristic acid, and palmitic acid. Examples of alkylsilanes include alkoxysilanes such as methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, dimethyldiethoxysilane, phenyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, octyltriethoxysilane, and decyltrimethoxysilane, as well as silazanes such as hexamethyldisilazane.

[0019] In a composition for cosmetics, the blending amount of particles (A) [when the particles (A) are coated with various compounds, the amount including this coating. The same applies to the blending amounts of the particles (A) and the ultraviolet ray blocking agent described below.] is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, from the viewpoint of ensuring good effects by its use. However, in a composition for cosmetics, if the blending amount of particles (A) is too large, there is a risk that the feel such as spread when applying to the skin may deteriorate, or it may become difficult to enhance the emulsion stability in the case of an emulsion. Therefore, the blending amount of particles (A) in the composition for cosmetics is preferably 30% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, and particularly preferably 5% by mass or less.

[0020] In the composition for cosmetics, an ultraviolet ray blocking agent other than particles (A) can also be blended together with particles (A).

[0021] Specific examples of the ultraviolet ray blocking agent other than particles (A) include ultraviolet ray scattering agents such as titanium oxide, zinc oxide, cerium oxide, iron oxide, zirconium oxide, and alumina; organic ultraviolet ray absorbers such as ethylhexyl methoxycinnamate, hexyl diethylaminohydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, polysilicone-15, ethylhexyl salicylate, octocrylene, phenylbenzimidazole sulfonic acid, t-butylmethoxydibenzoylmethane, droxometholone trisiloxane, terephthalylidene dicamphor sulfonic acid, homosalate, and oxybenzone; etc. When an ultraviolet ray blocking agent other than particles (A) is blended in the composition for cosmetics, for example, only one kind of the above-exemplified ultraviolet ray scattering agent and organic ultraviolet ray absorber may be blended, or two or more kinds may be blended. Titanium oxide and zinc oxide are preferable as the ultraviolet ray scattering agent, and ethylhexyl methoxycinnamate, hexyl diethylaminohydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and ethylhexyl triazone are preferable as the ultraviolet ray absorber.

[0022] When a composition for cosmetics contains particle (A) and an ultraviolet light screening agent other than particle (A), the amount of particle (A) is set within the range satisfying the above-mentioned preferred amount, and the total amount of ultraviolet light screening agents in the composition for cosmetics [total amount of particle (A) and the ultraviolet light screening agent other than particle (A)] is preferably 30% by mass or less.

[0023] The composition for cosmetics can adopt various dosage forms used in known cosmetics. Preferred dosage forms include emulsions and powders (powder cosmetics).

[0024] When the composition for cosmetics is an emulsion, it can be an oil-in-water emulsion (O / W type emulsion), a water-in-oil emulsion (W / O type emulsion), etc.

[0025] When the composition for cosmetics is an emulsion, in addition to an ultraviolet light screening agent such as particle (A), (B) water [hereinafter sometimes referred to as component (B)], (C) an oily component [hereinafter sometimes referred to as component (C)], (D) an emulsifier [hereinafter sometimes referred to as component (D)], etc. are blended.

[0026] As (B) water, purified water, ion-exchanged water, etc. can be used.

[0027] (C) Examples of oily components include silicone oils (cyclomethicone, cyclopentasiloxane, dimethicone, phenyl trimethicone, etc.), hydrocarbons (liquid paraffin, mineral oil, squalane, polyisobutene, etc.), higher fatty acids, higher alcohols (cetearyl alcohol, behenyl alcohol, etc.), oils and fats, waxes, and ester oils [triethylhexanoin, alkyl (C12-15) benzoate, diisopropyl sebacate, isononyl isononanoate, PG dicaprate, diethylhexyl succinate, isotridecyl isononanoate, cetyl ethylhexanoate, decyl oleate, caprylic / capric triglyceride, etc.]. Among these, cyclopentasiloxane, dimethicone, phenyl trimethicone, liquid paraffin, squalane, polyisobutene, triethylhexanoin, alkyl (C12-15) benzoate, diisopropyl sebacate, isononyl isononanoate, cetyl ethylhexanoate, and caprylic / capric triglyceride are preferred.

[0028] (D) Examples of emulsifiers include various surfactants (cationic surfactants, anionic surfactants, nonionic surfactants, amphoteric surfactants), polyether-modified silicones, and organically modified clay minerals.

[0029] Examples of nonionic surfactants include polyoxyethylene hydrogenated castor oil (PEG-100 hydrogenated castor oil, etc.), polyoxyethylene (20) sorbitan monolaurate, polyoxyethylene (20) sorbitan oleate, polyoxyethylene (20) cetearyl ether, polyglyceryl-10 stearate, polyhydroxystearic acid, and sorbitan sesquiisostearate. Examples of polyether-modified silicones include PEG-9 polydimethylsiloxyethyl dimethicone, lauryl PEG-9 polydimethylsiloxyethyl dimethicone, PEG-9 dimethicone, PEG-10 dimethicone, PEG-12 dimethicone, PEG-11 methyl ether dimethicone, PEG / PPG-20 / 23 dimethicone, and hydroxypropyl methyl silicone. Examples of organically modified clay minerals include disteardimonium hectorite, polyether-modified lauryl bentonite, and polyethylene glycol-modified montmorillonite. Preferred nonionic surfactants include polyoxyethylene hydrogenated castor oil, sorbitan oleate, polyhydroxystearic acid, and sorbitan sesquiisostearate; preferred polyether-modified silicones include PEG-9 polydimethylsiloxyethyl dimethicone, lauryl PEG-9 polydimethylsiloxyethyl dimethicone, and PEG-10 dimethicone; and preferred organically modified clay minerals include disteardimonium hectorite.

[0030] Furthermore, cosmetic compositions that are emulsions may also contain (E) additives [hereinafter sometimes referred to as (E) components], which are ingredients commonly used in various cosmetics, such as those for skin. Examples of such components include humectants (hyaluronic acid; lower alcohols such as ethanol; polyhydric alcohols such as propylene glycol, 1,3-butylene glycol, pentylene glycol, glycerin, polyethylene glycol, and polypropylene glycol), viscosity modifiers (carbomer, xanthan gum, acrylates copolymer, inulin stearate, dextrin palmitate, silylated silica, etc.), pH adjusters [acids such as citric acid; alkalis such as basic amines (triethanolamine, etc.)], preservatives (phenoxyethanol, methylparaben, ethylparaben, etc.), antioxidants (dibutylhydroxytoluene, tocopherol, etc.), chelating agents (EDTA-2Na, sodium polyphosphate, etc.), fragrances, colorants, and anti-inflammatory agents. Preferred humectants include ethanol, 1,3-butylene glycol, and glycerin, while preferred viscosity modifiers include carbomer, xanthan gum, (acrylates / C10-30 alkyl acrylate) crosspolymer, (sodium acrylate / sodium acryloyldimethyl taurate) copolymer, inulin stearate, dextrin palmitate, and silylated silica.

[0031] When the cosmetic composition is an oil-in-water emulsion, the amounts of various components other than the UV-blocking agent containing particle (A) are preferably as follows: (B) component: 40-90% by mass, (C) component: 5-40% by mass, (D) component: 0.5-10% by mass, and (E) component: 10% by mass or less.

[0032] Furthermore, when the cosmetic composition is a water-in-oil emulsion, the amounts of various components other than the UV-blocking agent containing particle (A) are preferably as follows: for example, component (B): 1 to 70% by mass, component (C): 20 to 95% by mass, component (D): 0.5 to 10% by mass, and component (E): 10% by mass or less.

[0033] An emulsion-type cosmetic composition can be manufactured by a process of emulsifying particles (A), (B) water, (C) an oily component, and optionally (D) an emulsifier. In this case, the components constituting the aqueous phase [(B) water, and hydrophilic components of the UV shielding agent containing particles (A), hydrophilic components of (E), and optionally (D)] and the components constituting the oil phase [(C) an oily component, and lipophilic components of the UV shielding agent containing particles (A), lipophilic components of (E), and optionally (D)] can be prepared in advance and mixed to manufacture an emulsion-type cosmetic composition.

[0034] When a cosmetic composition is made into a powder cosmetic, for example, in addition to UV-blocking agents such as particles (A), (C) oily components, (D) emulsifiers, (E) additives, etc., can be incorporated. Components (C), (D), and (E) can be the same as those previously exemplified as those that can be incorporated when the cosmetic composition is made into an emulsifier.

[0035] When the cosmetic composition is a powder cosmetic, the amounts of various components other than the UV-blocking agent containing particle (A) are preferably as follows: (B) component: 1 to 70% by mass, (C) component: 20 to 95% by mass, (D) component: 0.5 to 10% by mass, and (E) component: 10% by mass or less.

[0036] Cosmetic compositions, which are powdered cosmetic materials, can be manufactured by mixing their constituent components.

[0037] In the cosmetic composition of the present invention, by using particles (A) that have excellent ultraviolet shielding ability and visible light transmittance, it is possible to suppress white cast (where the applied area appears white and raised) and the occurrence of a bluish tint when applied to the skin, and because of its good transparency, the skin color can be well maintained in the applied area.

[0038] Furthermore, the cosmetic composition of the present invention uses particles (A) that have superior UV shielding ability compared to conventional UV shielding agents. As a result, high UV shielding ability can be ensured with a relatively small amount, providing greater flexibility in formulation. Moreover, by avoiding excessive increases in quantity when ensuring high UV shielding ability, it is easy to improve the feel of the product (such as its spreadability when applied to the skin) or, in the case of an emulsion, to ensure high emulsion stability.

[0039] Furthermore, particle (A) can constitute the ultraviolet shielding agent of the present invention either alone or in a mixed form with other components (such as ultraviolet shielding agents other than particle (A)). Various agents such as cosmetics containing the ultraviolet shielding agent of the present invention can ensure excellent ultraviolet shielding ability and visible light transmittance.

[0040] When the cosmetic composition of the present invention is an emulsion, it can be applied to applications such as sunscreens, foundations, lotions, and skin creams in the form of, for example, a cream or lotion. Furthermore, when the cosmetic composition of the present invention is a powder cosmetic, it can be applied to applications such as powder foundations.

[0041] Furthermore, the ultraviolet shielding agent of the present invention can be used by incorporating it into various agents such as cosmetics that require ultraviolet shielding ability. [Examples]

[0042] The present invention will be described in detail below based on examples. However, the following examples are not intended to limit the present invention.

[0043] <Preparation of particle (A)> Almedio's 100nm silicon particles (product code: Si-E100NM2NA) were placed in deionized water, and the particles were dispersed using an ultrasonic homogenizer manufactured by Nippon Seiki Seisakusho Co., Ltd. to prepare a slurry with a particle content of 2.5% by mass. The obtained slurry was centrifuged at 1000G for 240 minutes using a centrifuge manufactured by Tommy Seikou Co., Ltd., and particles with a particle size of 100nm or larger were removed by aspirating a portion 4cm from the surface of the sedimentation tube, obtaining a slurry containing "particle (A)-1" with an average particle size of 50nm. This slurry was then dried to extract "particle (A)-1".

[0044] Furthermore, except for changing the classification conditions using a centrifuge, "particle (A)-2" with an average particle diameter of 30 nm, "particle (A)-3" with an average particle diameter of 75 nm, and "particle (a)" with an average particle diameter of 115 nm were obtained in the same manner as particle (A)-1.

[0045] <Preparation of silica-alumina treated particles (A)> An aqueous slurry was prepared by adding "particle (A)-1" to water at a ratio of 5% by mass. While stirring this slurry, sodium silicate in an amount equal to 10% by mass and sulfuric acid in an amount equal to 50% by mass were added and reacted to form silica on the surface of "particle (A)-1" in an amount of 3 parts by mass per 100 parts by mass of "particle (A)-1", thereby surface-treating "particle (A)-1". Subsequently, sodium aluminate in an amount equal to 10% by mass and sulfuric acid in an amount equal to 50% by mass were added to this slurry and reacted to form aluminum hydroxide in an amount of 3 parts by mass per 100 parts by mass of "particle (A)-1", thereby further surface-treating the silica-treated surface of "particle (A)-1". After that, the slurry was filtered and the filtrate was washed, and the resulting cake was placed in a dryer and dried at 105°C for 2 hours, and then pulverized to obtain silica-alumina treated particles (A) [silica-alumina treated particles (A)].

[0046] <Preparation of silicone oil-treated particles (A)> Hydrogen dimethicone (KF-9901, manufactured by Shin-Etsu Chemical Co., Ltd.), a silicone oil treatment agent, was added to "particle (A)-1" in an amount of 5 parts by mass per 100 parts by mass of "particle (A)-1". This mixture was stirred in a tabletop blender for 20 minutes to perform surface treatment on "particle (A)-1". After surface treatment, the resulting powder was placed in a dryer, dried at 105°C for 2 hours, and then pulverized to obtain particles (A) [silicone oil treated particles (A)] with a silicone oil treated surface.

[0047] <Preparation of alkylsilane-treated particles (A)-1> To "Particle (A)-1," octyltriethoxysilane (A-137, manufactured by Momentive Performance Materials Japan), an alkylsilane treatment agent, was added in an amount of 5 parts by mass per 100 parts by mass of "Particle (A)-1." This mixture was then stirred in a tabletop blender for 20 minutes to surface-treat "Particle (A)-1." After surface treatment, the resulting powder was placed in a dryer, dried at 105°C for 2 hours, and then pulverized to obtain Particle (A) [Alkylsilane-treated Particle (A)-1] with an alkylsilane-treated surface.

[0048] <Preparation of alkylsilane-treated particles (A)-2> To "Particle (A)-1," octyltriethoxysilane (A-137, manufactured by Momentive Performance Materials Japan), an alkylsilane treatment agent, was added in an amount of 15 parts by mass per 100 parts by mass of "Particle (A)-1." This mixture was then stirred in a tabletop blender for 20 minutes to surface-treat "Particle (A)-1." After surface treatment, the resulting powder was placed in a dryer, dried at 105°C for 2 hours, and then pulverized to obtain Particle (A) [Alkylsilane-treated Particle (A)-2] with an alkylsilane-treated surface.

[0049] Preparation of cosmetic compositions (oil-in-water emulsions) Examples 1-6, Comparative Example 1 Cosmetic compositions for Examples 1-6 and Comparative Example 1 were prepared by mixing each component shown in Table 1 in the compositions shown in Table 1. All of the resulting cosmetic compositions were oil-in-water emulsions.

[0050] The cosmetic compositions of Examples 1-6 and Comparative Example 1 were evaluated as follows.

[0051] [Evaluation of UV shielding ability and transparency] The UV shielding performance was evaluated using the SPF measurement method (ISO 24443).

[0052] In the SPF measurement method, each of the cosmetic compositions of Examples 1-6 and Comparative Example 1 was measured at 1.3 mg / cm³ on an evaluation plate [HELIOPLATE® HD6 manufactured by Helioscreen]. 2 After applying the sample in the specified amount and drying it at room temperature for 30 minutes, the SPF, UVAPF (Ultraviolet A Protection Factor), and critical wavelength (CWL) were measured using an SPF analyzer (Labsphere "UV-2000S").

[0053] Transparency evaluation was performed using the following method. Each of the cosmetic compositions of Examples 1-6 and Comparative Example 1 was uniformly coated onto a PP film (OPP "#40" manufactured by Mitsui Chemicals Tohcello Co., Ltd.) using a coating machine (manufactured by Imoto Seisakusho Co., Ltd.) and a bar coater ("No. 6" manufactured by Mitsuwa Frontech Co., Ltd.) to prepare a thin film. The transmittance curve of the obtained thin film was measured using a spectrophotometer ("U-4100" manufactured by Hitachi, Ltd.) to determine the transmittance at a wavelength of 600 nm. Transparency can be evaluated as good if the transmittance is 80% or higher.

[0054] [Evaluation of color] Each of the cosmetic compositions from Examples 1-6 and Comparative Example 1 was applied to the same area of ​​skin on the same person, and the skin color after application was visually evaluated. If no change in skin color was observed before and after application of the cosmetic composition, it means that the cosmetic composition applied to the skin did not absorb light in the visible light region, and therefore the cosmetic composition can be said to have excellent visible light transmittance.

[0055] These evaluation results are listed in Table 1. In Table 1, the amount of each component is shown as a percentage so that it equals 100% of the entire cosmetic composition. All percentages are by mass, and in these tables, the percentage notation is omitted, and only the numerical value representing the amount is shown (the same applies to the tables below). Furthermore, in Table 1, for the evaluation results of color, "○" is written when there was no change in skin color before and after application, and "△" is written when a bluish or yellowish tint was observed on the skin after application (the same applies to the tables below). In addition, "Titanium Dioxide Powder-1" listed in Table 1 is "MT-100Z" manufactured by Teika Co., Ltd. (the same applies to the tables below).

[0056] [Table 1]

[0057] As shown in Table 1, the cosmetic compositions of Examples 1 to 6, in which particle (A) was incorporated into the aqueous or oil phase, showed higher SPF, UVAPF, and CWL compared to the cosmetic composition of Comparative Example 1, which did not contain particle (A), demonstrating superior UV shielding ability. Furthermore, all cosmetic compositions of Examples 1 to 6 maintained high transparency, with a light transmittance of 80% or more at a wavelength of 600 nm. In addition, while the cosmetic composition of Comparative Example 1 produced a bluish tint when applied to the skin, this was suppressed in the cosmetic compositions of Examples 1 to 6, and no white cast occurred, with almost no change in skin tone before and after application.

[0058] Examples 7, 8, Comparative Example 2 The cosmetic compositions of Examples 7, 8, and Comparative Example 2 were prepared by mixing each component shown in Table 2 in the compositions shown in Table 2. The resulting cosmetic compositions were oil-in-water emulsions.

[0059] The cosmetic compositions of Examples 7 and 8 and Comparative Example 2 were evaluated for UV shielding ability, transparency, and color in the same manner as the cosmetic composition of Example 1. These results are shown in Table 2. Table 2 also includes the composition and evaluation results of the cosmetic composition of Example 2.

[0060] [Table 2]

[0061] As shown in Table 2, the cosmetic compositions of Examples 2, 7, and 8, which contained particles (A) [particles (A)-1 to (A)-3] with an appropriate average particle size, all had high SPF, UVAPF, and CWL, demonstrating excellent UV shielding ability. Furthermore, the cosmetic compositions of Examples 2, 7, and 8 all exhibited high transmittance of light at a wavelength of 600 nm, maintaining high transparency. In contrast, the cosmetic composition of Comparative Example 2, which contained particles (a) with an unsuitable average particle size instead of particle (A), had low transmittance of light at a wavelength of 600 nm and poor transparency. Moreover, it had low SPF, UVAPF, and CWL, and poor UV shielding ability. The transparency of the cosmetic composition of Comparative Example 2 was also inferior to that of the cosmetic composition of Example 1 shown in Table 1. Furthermore, while the cosmetic composition of Comparative Example 2 produced a yellowish tint when applied to the skin, this was suppressed in the cosmetic compositions of Examples 2, 7, and 8. In addition, there was no bluish tint or white cast, and there was almost no change in skin tone before and after application.

[0062] In Examples 2, 7, and 8, the cosmetic compositions were identical except for the difference in the average particle size of particle (A). However, it was observed that the UV shielding ability tended to improve as the average particle size of particle (A) increased. On the other hand, transparency (visible light transmittance) tended to decrease as the average particle size of particle (A) increased.

[0063] Comparative Example 3 Comparative Example 3, a cosmetic composition, was prepared by mixing the components shown in Table 3 in the composition shown in Table 3. The resulting cosmetic composition was an oil-in-water emulsion.

[0064] The cosmetic composition of Comparative Example 3 was evaluated for its UV shielding ability, transparency, and color in the same manner as the cosmetic composition of Example 1. These results are shown in Table 3. The composition and evaluation results of the cosmetic composition of Example 1 are also shown in Table 3. The "Titanium Dioxide Powder-2" listed in Table 3 is "MT-150A" manufactured by Teika Co., Ltd. (the same applies to the tables below).

[0065] [Table 3]

[0066] As shown in Table 3, the cosmetic composition of Example 1 had higher SPF, UVAPF, and CWL values ​​compared to the cosmetic composition of Comparative Example 3, which contained the same amount of titanium dioxide powder-2 in the aqueous phase instead of particle (A)-1, and exhibited superior ultraviolet shielding ability. Furthermore, the cosmetic composition of Example 1 showed almost no change in skin tone before and after application, while the cosmetic composition of Comparative Example 3 produced a bluish tint when applied to the skin.

[0067] Comparative Example 4 Comparative Example 4, a cosmetic composition, was prepared by mixing the components shown in Table 4 in the composition shown in Table 4. The resulting cosmetic composition was an oil-in-water emulsion.

[0068] The cosmetic composition of Comparative Example 4 was evaluated for its UV shielding ability and color in the same manner as the cosmetic composition of Example 1. These results are shown in Table 4. Table 4 also includes the composition and evaluation results of the cosmetic composition of Example 2.

[0069] [Table 4]

[0070] As shown in Table 4, the cosmetic composition of Example 2 had higher SPF, UVAPF, and CWL values ​​compared to the cosmetic composition of Comparative Example 4, which contained the same amount of titanium dioxide powder-2 instead of particle (A)-1 in the aqueous phase, demonstrating superior UV shielding ability. Furthermore, the cosmetic composition of Example 2 showed almost no change in skin tone before and after application, while the cosmetic composition of Comparative Example 4 produced a bluish tint when applied to the skin. The difference in UV shielding ability between the cosmetic composition of Example 2, which had a higher amount of particle (A)-1 and titanium dioxide powder-2, and the cosmetic composition of Comparative Example 4 was greater than the difference in UV shielding ability between the cosmetic composition of Example 1, which had a lower amount of particle (A)-1 and titanium dioxide powder-2, and the cosmetic composition of Comparative Example 3.

[0071] <Preparation of cosmetic compositions (powdered cosmetics)> Example 9 and Comparative Example 5 The cosmetic compositions of Example 9 and Comparative Example 5 were prepared by mixing each component shown in Table 5 in the compositions shown in Table 5.

[0072] The cosmetic compositions of Example 9 and Comparative Example 5 were evaluated for their ultraviolet shielding ability in the same manner as the cosmetic composition of Example 1. The results are shown in Table 5.

[0073] [Table 5]

[0074] As shown in Table 5, the cosmetic composition of Example 9, which is a powder cosmetic containing particles (A) whose surface has been treated with silicone oil, was found to have higher SPF, UVAPF, and CWL compared to the cosmetic composition of Comparative Example 5, and was confirmed to have excellent ultraviolet shielding ability.

[0075] Preparation of cosmetic compositions (oil-in-water emulsions) Examples 10-14, Comparative Example 6 Cosmetic compositions for Examples 10-14 and Comparative Example 6 were prepared by mixing each component shown in Table 6 in the composition shown in Table 6. The resulting cosmetic compositions were oil-in-water emulsions.

[0076] The cosmetic compositions of Examples 10-14 and Comparative Example 6 were evaluated for their UV shielding ability and color in the same manner as the cosmetic composition of Example 1. The results are shown in Table 6.

[0077] [Table 6]

[0078] As shown in Table 6, the cosmetic compositions of Examples 10 to 12 were oil-in-water emulsions obtained by changing the ingredients from the cosmetic composition of Example 1, etc. The cosmetic composition of Example 13 was prepared by substituting silica-alumina treated particles (A) for particle (A)-1, and the cosmetic composition of Example 14 was prepared by incorporating particle (A)-1 into the oil phase. Compared to the cosmetic composition of Comparative Example 6, which did not contain particle (A), it was confirmed that the SPF, UVAPF, and CWL were all higher, indicating excellent UV shielding ability. Furthermore, there was almost no change in skin tone before and after application with the cosmetic compositions of Examples 10 to 14, but a bluish tint appeared when the cosmetic composition of Comparative Example 6 was applied to the skin.

[0079] Example 15 and Comparative Example 7 The cosmetic compositions of Example 15 and Comparative Example 7 were prepared by mixing each component shown in Table 7 in the composition shown in Table 7. The resulting cosmetic compositions were oil-in-water emulsions.

[0080] The cosmetic compositions of Example 15 and Comparative Example 7 were evaluated for their UV shielding ability and color in the same manner as the cosmetic composition of Example 1. The results are shown in Table 7.

[0081] [Table 7]

[0082] As shown in Table 7, the cosmetic composition of Example 15 was prepared using an aqueous phase containing particle (A) and an oil phase containing the organic UV absorbers ethylhexyl methoxycinnamate and diethylamino hydroxybenzoyl hexyl benzoate. Compared to the cosmetic composition of Comparative Example 7, which did not contain particle (A), it was confirmed that it had superior UV shielding ability, with higher SPF, UVAPF, and CWL. Furthermore, with the cosmetic composition of Example 15, there was almost no change in skin tone before and after application.

[0083] Example 16 and Comparative Example 8 The cosmetic compositions of Example 16 and Comparative Example 8 were prepared by mixing each component shown in Table 8 in the composition shown in Table 8. The resulting cosmetic compositions were oil-in-water emulsions.

[0084] The cosmetic compositions of Example 16 and Comparative Example 8 were evaluated for their UV shielding ability and color in the same manner as the cosmetic composition of Example 1. The results are shown in Table 8.

[0085] [Table 8]

[0086] As shown in Table 8, the cosmetic composition of Example 16 was prepared using an aqueous phase containing particle (A) and an oil phase containing titanium dioxide powder-1, an ultraviolet scattering agent, and ethylhexyl methoxycinnamate and diethylamino hydroxybenzoyl hexyl benzoate, both organic ultraviolet absorbers. Compared to the cosmetic composition of Comparative Example 8, which did not contain particle (A), it was confirmed that the SPF, UVAPF, and CWL were all higher, indicating excellent ultraviolet shielding ability. Furthermore, with the cosmetic composition of Example 16, there was almost no change in skin tone before and after application.

[0087] Examples 17, 18 and Comparative Example 9 The cosmetic compositions of Examples 17, 18, and Comparative Example 9 were prepared by mixing each component shown in Table 9 in the composition shown in Table 9. The resulting cosmetic compositions were oil-in-water emulsions.

[0088] The cosmetic compositions of Examples 17 and 18 and Comparative Example 9 were evaluated for their UV shielding ability and color in the same manner as the cosmetic composition of Example 1. These results are shown in Table 9. Table 9 also includes the composition and evaluation results of the cosmetic composition of Example 12.

[0089] [Table 9]

[0090] As shown in Table 9, the cosmetic compositions of Examples 12, 17, and 18, which contained particles (A) [particles (A)-1 to (A)-3] with an appropriate average particle size, had higher SPF, UVAPF, and CWL values ​​compared to the cosmetic composition of Comparative Example 9, which contained particles (a) with an unsuitable average particle size, demonstrating superior UV shielding ability. Furthermore, the cosmetic compositions of Examples 12, 17, and 18 showed almost no change in skin tone before and after application, while the cosmetic composition of Comparative Example 9 produced a bluish tint when applied to the skin.

[0091] Comparative Example 10 Comparative Example 10 cosmetic composition was prepared by mixing each component shown in Table 10 in the composition shown in Table 10. The resulting cosmetic composition was an oil-in-water emulsion.

[0092] The cosmetic composition of Comparative Example 10 was evaluated for its UV shielding ability and color in the same manner as the cosmetic composition of Example 1. These results are shown in Table 10. Table 10 also includes the composition and evaluation results of the cosmetic composition of Example 10.

[0093] [Table 10]

[0094] As shown in Table 10, the cosmetic composition of Example 10 had higher SPF, UVAPF, and CWL values ​​compared to the cosmetic composition of Comparative Example 10, which contained the same amount of titanium dioxide powder-2 in the aqueous phase instead of particle (A)-1, and exhibited superior ultraviolet shielding ability. Furthermore, the cosmetic composition of Example 10 showed almost no change in skin tone before and after application, while the cosmetic composition of Comparative Example 10 produced a bluish tint when applied to the skin.

[0095] Comparative Example 11 Comparative Example 11 of cosmetic composition was prepared by mixing each component shown in Table 11 in the composition shown in Table 11. The resulting cosmetic composition was an oil-in-water emulsion.

[0096] The cosmetic composition of Comparative Example 11 was evaluated for its UV shielding ability and color in the same manner as the cosmetic composition of Example 1. These results are shown in Table 11. Table 11 also includes the composition and evaluation results of the cosmetic composition of Example 12.

[0097] [Table 11]

[0098] As shown in Table 11, the cosmetic composition of Example 12 had higher SPF, UVAPF, and CWL values ​​compared to the cosmetic composition of Comparative Example 11, in which the same amount of titanium dioxide powder-2 was added to the aqueous phase instead of particle (A)-1, and exhibited superior ultraviolet shielding ability.

[0099] <Preparation of cosmetic compositions (water-in-oil emulsions)> Examples 19-22, Comparative Example 12 The cosmetic compositions of Examples 19-22 and Comparative Example 12 were prepared by mixing each component shown in Table 12 in the compositions shown in Table 12. The resulting cosmetic compositions were water-in-oil emulsions.

[0100] The cosmetic compositions of Examples 19-22 and Comparative Example 12 were evaluated for their UV shielding ability and color in the same manner as the cosmetic composition of Example 1. The results are shown in Table 12.

[0101] [Table 12]

[0102] As shown in Table 12, the cosmetic compositions of Examples 19-22, which incorporated particle (A) into the aqueous phase, had higher SPF, UVAPF, and CWL values ​​compared to the cosmetic composition of Comparative Example 12, which did not contain particle (A), demonstrating superior UV shielding ability. Furthermore, the cosmetic compositions of Examples 19-22 showed almost no change in skin tone before and after application.

[0103] Examples 23, 24 The cosmetic compositions of Examples 23 and 24 were prepared by mixing each component shown in Table 13 in the composition shown in Table 13. The resulting cosmetic compositions were water-in-oil emulsions.

[0104] The cosmetic compositions of Examples 23 and 24 were evaluated for their UV shielding ability and color in the same manner as the cosmetic composition of Example 1. These results are shown in Table 13. Table 13 also includes the composition and evaluation results of the cosmetic composition of Comparative Example 12.

[0105] [Table 13]

[0106] As shown in Table 13, the cosmetic composition of Example 23, in which silicone oil-treated particles (A) were incorporated into the oil phase, and the cosmetic composition of Example 24, in which silica-alumina-treated particles (A) were incorporated into the aqueous phase, all had higher SPF, UVAPF, and CWL compared to the cosmetic composition of Comparative Example 12, which did not contain particles (A), and exhibited superior ultraviolet shielding ability. Furthermore, the cosmetic compositions of Examples 23 and 24 showed almost no change in skin tone before and after application.

[0107] Example 25 The cosmetic composition of Example 25 was prepared by mixing each component shown in Table 14 in the composition shown in Table 14. In the cosmetic composition of Example 25, particle (A)-1 was dispersed in water to form a slurry [the proportion of particle (A)-1 was 10% by mass], and the aqueous phase formed using this slurry was used. The resulting cosmetic composition was a water-in-oil emulsion.

[0108] The cosmetic composition of Example 25 was evaluated for its UV shielding ability and color in the same manner as the cosmetic composition of Example 1. These results are shown in Table 14. Table 14 also includes the composition and evaluation results of the cosmetic compositions of Example 20 and Comparative Example 12.

[0109] [Table 14]

[0110] As described above, the cosmetic composition of Example 25 was prepared using a slurry containing particle (A). Similar to the cosmetic composition of Example 20, which used powdered particle (A) in the same amount, it had higher SPF, UVAPF, and CWL than the cosmetic composition of Comparative Example 12, which did not contain particle (A), and exhibited excellent UV shielding ability. Furthermore, with the cosmetic composition of Example 25, there was almost no change in skin tone before and after application.

[0111] Comparative Example 13 Comparative Example 13 of the cosmetic composition was prepared by mixing each component shown in Table 15 in the composition shown in Table 15. The resulting cosmetic composition was a water-in-oil emulsion.

[0112] The cosmetic composition of Comparative Example 13 was evaluated for its UV shielding ability and color in the same manner as the cosmetic composition of Example 1. These results are shown in Table 15. Table 15 also includes the compositions and evaluation results of the cosmetic compositions of Example 21 and Comparative Example 12.

[0113] [Table 15]

[0114] As shown in Table 15, the cosmetic composition of Example 21, which contains particles (A) and UV-blocking agents other than particles (A), was found to have significantly higher SPF and UVAPF compared to the cosmetic composition of Comparative Example 12, which does not contain particles (A), and the cosmetic composition of Comparative Example 13, which does not contain UV-blocking agents other than particles (A), demonstrating excellent UV-blocking ability.

[0115] Example 26, Comparative Example 14 The cosmetic compositions of Example 26 and Comparative Example 14 were prepared by mixing each component shown in Table 16 in the composition shown in Table 16. The resulting cosmetic compositions were water-in-oil emulsions.

[0116] The cosmetic compositions of Example 26 and Comparative Example 14 were evaluated for their UV shielding ability and color in the same manner as the cosmetic composition of Example 1. The results are shown in Table 16.

[0117] [Table 16]

[0118] As shown in Table 16, the cosmetic composition of Example 26 was prepared using an aqueous phase containing particle (A) and an oil phase containing ethylhexyl methoxycinnamate, an organic ultraviolet absorber. Compared to the cosmetic composition of Comparative Example 14, which did not contain particle (A), it was confirmed that it had superior ultraviolet shielding ability, with higher SPF, UVAPF, and CWL. Furthermore, with the cosmetic composition of Example 26, there was almost no change in skin tone before and after application.

[0119] Example 27, Comparative Example 15 The cosmetic compositions of Example 27 and Comparative Example 15 were prepared by mixing each component shown in Table 17 in the composition shown in Table 17. The resulting cosmetic compositions were water-in-oil emulsions.

[0120] The cosmetic compositions of Example 27 and Comparative Example 15 were evaluated for their UV shielding ability and color in the same manner as the cosmetic composition of Example 1. The results are shown in Table 17.

[0121] [Table 17]

[0122] As shown in Table 16, the cosmetic composition of Example 27 was prepared using an aqueous phase containing particle (A) and an oil phase containing titanium dioxide powder-1, an ultraviolet scattering agent, and ethylhexyl methoxycinnamate, an organic ultraviolet absorber. Compared to the cosmetic composition of Comparative Example 15, which did not contain particle (A), it was confirmed that it had superior ultraviolet shielding ability, with higher SPF, UVAPF, and CWL. Furthermore, with the cosmetic composition of Example 27, there was almost no change in skin tone before and after application.

[0123] Example 28, Comparative Example 16 Cosmetic compositions for Example 28 and Comparative Example 16 were prepared by mixing each component shown in Table 18 in the compositions shown in Table 18. In the cosmetic composition for Example 28, particle (A)-1 was dispersed in water to form a slurry [the proportion of particle (A)-1 was 10% by mass], and the aqueous phase formed using this slurry was used. The zinc oxide powder used in the oil phase was Teika's "MZX-508OTS" with an average particle size of 25 nm, surface-treated with triethoxycaprylylsilane. The resulting cosmetic composition was a water-in-oil emulsion.

[0124] The cosmetic compositions of Example 28 and Comparative Example 16 were evaluated for their UV shielding ability and color in the same manner as the cosmetic composition of Example 1. The results are shown in Table 18.

[0125] [Table 18]

[0126] As described above, the cosmetic composition of Example 28 was prepared using an aqueous phase containing a slurry with particle (A) and an oil phase containing zinc oxide powder, which is an ultraviolet scattering agent. Compared to the cosmetic composition of Comparative Example 16, which did not contain particle (A), it had higher SPF, UVAPF, and CWL, and exhibited excellent ultraviolet shielding ability. Furthermore, with the cosmetic composition of Example 28, there was almost no change in skin tone before and after application.

Claims

1. The material consists of particles (A) made of elemental silicon or silicon compounds containing 80 atomic percent or more of silicon, with an average particle diameter of 5 nm or more and less than 80 nm, and is a mixture of titanium dioxide and / or zinc oxide. The amount of particle (A) blended is 0.01 to 30% by mass. A cosmetic composition characterized in that, when the amount of the particles (A) is set to 1 by mass, the amount of titanium dioxide and / or zinc oxide is 7 to 200.

2. The cosmetic composition according to claim 1, wherein the average particle diameter of the above-mentioned particles (A) is 20 nm or more and 70 nm or less.

3. The cosmetic composition according to claim 1, which is an emulsion further containing water and oil components.

4. The cosmetic composition according to claim 1, which is a powder cosmetic.

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