Cosmetic composition

Abstract

Provided is a cosmetic composition having further improved ultraviolet absorption ability in the entire UVA and UVB regions.　The cosmetic composition contains (i) compound I having a structure of formula (I)　(in the formula, -OA represents an alkoxy group), (ii) UV scattering agent particles, (iii) a dispersant, and an oil capable of at least partially dissolving component (i), wherein the content of the UV scattering agent particles is more than 7.0 mass%, and the dispersant includes at least one dispersant selected from the group consisting of polyhydroxystearic acid, isostearic acid, a polyglyceryl-based dispersant, and a sorbitan-based dispersant.

Description

[[Technical Field]]

[0001] The present invention relates to a cosmetic composition. [[Background Art]]

[0002] Protecting the skin from ultraviolet radiation is one of the important issues for skin care and body care. Not only medium-wavelength ultraviolet rays (UVB region: wavelength 290 to 320 nm), which are known to cause sunburn, inflammation and the like, but also the effects of long-wavelength ultraviolet rays (UVA region: wavelength 320 to 400 nm) on the skin (such as photoaging) are known.

[0003] Conventional cosmetics for ultraviolet protection have generally often contained 2-ethylhexyl p-methoxycinnamate as an ultraviolet absorber. While 2-ethylhexyl p-methoxycinnamate has an effect of absorbing ultraviolet rays in the UVB region, there is a demand for an ultraviolet absorber having better ultraviolet absorption ability in the UVA region.

[0004] In contrast, the ultraviolet absorber disclosed in Patent Document 1 has absorption ability in both the UVA region and the UVB region, exhibits an ultraviolet suppressing effect over a wide range of wavelengths, and is said to have a previously unobserved characteristic that the ultraviolet absorption ability in the UVA and UVB regions increases as the duration of ultraviolet irradiation elapses.

[0005] More specifically, the ultraviolet absorber of Patent Document 1 is represented by general formula I: [[Chemical Drawing]] wherein -OA represents an alkoxy group, which contains the compound represented by said formula as an active ingredient. [[Prior Art Literature]] [[Patent Literature]]

[0006] [[Patent Document 1]] International Publication No. 2009 / 041098 [[Summary of the Invention]] [Problems that the invention aims to solve]

[0007] However, when comparing the integrated absorbance values ​​in the 290-400 nm range (the entire UVA and UVB region) of a conventional cosmetic composition containing a conventional UV absorber (e.g., octocrylene) with a cosmetic composition using the compound described in Patent Document 1 instead of this conventional UV absorber, no significant difference was found between these cosmetic compositions.

[0008] Therefore, the cosmetic composition containing the UV absorber described in Patent Document 1 still has room for improvement in terms of its overall UV absorption capacity across the UVA and UVB regions.

[0009] The present invention aims to improve upon the above circumstances, and its objective is to provide a cosmetic composition in which the ultraviolet absorption capacity across the entire UVA and UVB region is further improved. [Means for solving the problem]

[0010] The present invention, which achieves the above objectives, is as follows:

[0011] <Aspect 1> It contains the following components (i) to (iii), and an oil that can dissolve component (i) at least partially, (i) Compound I having the structure of the following formula (I): [ka] (In the formula, -OA represents an alkoxy group.) (ii) UV scattering agent particles, and (iii) Dispersant, The content of the aforementioned ultraviolet scattering agent particles is more than 7.0% by mass, and The dispersant comprises at least one dispersant selected from the group consisting of polyhydroxystearic acid, isostearic acid, polyglyceryl-based dispersants, and sorbitan-based dispersants. A cosmetic composition. <Aspect 2> The composition according to Aspect 1, wherein the content of the ultraviolet scattering agent particles is 10% by mass or more. <Aspect 3> The composition according to Aspect 1 or 2, wherein the dispersant comprises at least one dispersant selected from the group consisting of the polyhydroxystearic acid and the polyglyceryl-based dispersant. <Aspect 4> The composition according to any one of Aspects 1 to 3, wherein the polyglyceryl-based dispersant is polyglycerin-modified silicone or a fatty acid polyglyceryl ester having 3 to 8 glycerin units. <Aspect 5> The composition according to any one of Aspects 1 to 4, wherein the content of the dispersant is 0.5% by mass or more and 3.5% by mass or less. <Aspect 6> The composition according to any one of Aspects 1 to 5, wherein the oil component comprises a polar oil. <Aspect 7> The composition according to any one of Aspects 1 to 6, which is an oil-in-water cosmetic. <Aspect 8> The composition according to any one of Aspects 1 to 6, which is a water-in-oil cosmetic. <Aspect 9> The composition according to any one of Aspects 1 to 6, which is an oily cosmetic. <Aspect 10> The composition according to any one of Aspects 1 to 9, which is a sunscreen cosmetic composition. [Effects of the Invention]

[0012] According to the present invention, a cosmetic composition having further improved ultraviolet absorption ability over the entire UVA and UVB regions can be provided. [Mode for Carrying Out the Invention]

[0013] Hereinafter, embodiments of the present invention will be described in detail. Note that the present invention is not limited to the following embodiments, and can be implemented with various modifications within the scope of the spirit of the invention.

[0014] Cosmetic Composition The cosmetic composition of the present invention (hereinafter, also simply referred to as "the composition of the present invention") contains the following components (i) to (iii), and an oil component capable of at least partially dissolving said component (i), (i) Compound I having the structure of the following formula (I):

Chemical Structure

[0015] The present inventors have found through intensive studies that, unexpectedly, when a specific dispersant is contained and the content of ultraviolet scattering agent particles in the cosmetic is relatively high (for example, more than 7.0% by mass), using Compound I having the structure of the above formula (I) as an ultraviolet absorber instead of a conventional ultraviolet absorber greatly improves the integrated absorbance at 290 to 400 nm (that is, the overall ultraviolet absorption capacity in the UVA and UVB regions).

[0016] <Component (i): Compound I> Compound I according to the present invention has a structure represented by the following formula (I):

Chemical Structure

[0017] In formula (I), -OA represents an alkoxy group, and more specifically, examples thereof include, but are not limited to, a methoxy group, an ethoxy group, and the like.

[0018] In the present invention, compound I may have the same structure as the compound represented by general formula I disclosed in Patent Document 1.

[0019] Furthermore, in the composition of the present invention, from the viewpoint of further exhibiting the effects of the present invention, it is preferable that compound I is at least partially dissolved, particularly 50% by mass or more, more particularly 90% by mass or more, even more particularly 99% by mass or more, and most particularly 100% by mass or more.

[0020] In the composition of the present invention, the content of compound I is not particularly limited and may be, for example, 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 1.5% by mass or more, 2.0% by mass or more, 2.5% by mass or more, 3.0% by mass or more, 3.5% by mass or more, 4.0% by mass or more, 4.5% by mass or more, 5.0% by mass or more, 5.5% by mass or more, 6.0% by mass or more, 6.5% by mass or more, 7.0% by mass or more, 7.5% by mass or more, 8.0% by mass or more, 8.5% by mass or more, 9.0% by mass or more, 9.5% by mass or more, or 10% by mass or more, or 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 10% by mass or less, 8.0% by mass or less, 5.0% by mass or less, or 2.0% by mass or less, relative to the entire cosmetic composition.

[0021] <Ingredient (ii): UV scattering agent particles> The composition of the present invention can enhance its UV protection effect by including UV scattering agent particles. In the present invention, the UV scattering agent particles are not particularly limited and may be, for example, at least one metal oxide particle selected from the group consisting of titanium dioxide, zinc oxide, iron oxide, and cerium oxide.

[0022] Furthermore, the ultraviolet scattering agent particles may be hydrophobized. Here, the hydrophobization treatment can be carried out using known surface treatment agents that make surfaces hydrophobic, and examples include fatty acid treatment, fluorine compound treatment, silicone treatment, silicone resin treatment, pendant treatment, silane coupling agent treatment, titanium coupling agent treatment, oil treatment, N-acylated lysine treatment, polyacrylic acid treatment, amino acid treatment, inorganic compound treatment, plasma treatment, mechanochemical treatment, silane compound treatment, silazane compound treatment, etc. Among these treatments, from the viewpoint of dispersion stability, fatty acid treatment with dextrin palmitate, aluminum stearate, etc., and silicone treatment are preferred.

[0023] The average primary particle diameter of the ultraviolet scattering agent particles is not particularly limited and may be, for example, 5 nm or more, 10 nm or more, or 15 nm or more, or 200 nm or less, 100 nm or less, or 50 nm or less. The "average primary particle diameter" may be determined as the equivalent diameter of the projected area circle of the primary particles in the SEM image.

[0024] The shape of the ultraviolet scattering agent particles is not particularly limited and may include, for example, spherical, plate-shaped, rod-shaped, spindle-shaped, needle-shaped, or irregularly shaped particles.

[0025] In the composition of the present invention, the content of ultraviolet scattering agent particles is greater than 7.0% by mass of the entire cosmetic composition, and more specifically, it may be greater than 7.0% by mass, 7.5% by mass or more, 8.0% by mass or more, 8.5% by mass or more, 9.0% by mass or more, 10% by mass or more, 11% by mass or more, 12% by mass or more, 13% by mass or more, 14% by mass or more, or 15% by mass or more. Furthermore, the upper limit of the content of ultraviolet scattering agent particles is not particularly limited, and may be 30% by mass or less, 20% by mass or less, or 18% by mass or less of the entire cosmetic composition.

[0026] <Component (iii): Dispersant> In the composition of the present invention, the dispersant can uniformly disperse ultraviolet scattering agent particles in a medium (for example, oil, etc.).

[0027] Furthermore, the inventors unexpectedly discovered that by using a specific dispersant described below as a dispersant for dispersing ultraviolet scattering agent particles, the integrated absorbance value of the composition at 290-400 nm is further significantly improved.

[0028] In the present invention, the dispersant preferably comprises at least one dispersant selected from the group consisting of polyhydroxystearic acid, isostearic acid, polyglyceryl-based dispersants, and sorbitan-based dispersants, more preferably comprises at least one dispersant selected from the group consisting of polyhydroxystearic acid and polyglyceryl-based dispersants, and particularly preferably comprises polyhydroxystearic acid. In the present invention, the above-mentioned specific dispersant is also referred to as the "specific dispersant of the present invention."

[0029] (Hydroxypolystearate) In the present invention, as polyhydroxystearic acid, a compound oligomerized by the formation of ester bonds in hydroxystearic acid can be used, and commercially available products may also be used. Furthermore, the degree of polymerization of polyhydroxystearic acid is not particularly limited and may be, for example, 4 to 8.

[0030] (Polyglyceryl-based dispersants) In the present invention, the polyglyceryl dispersant may be a polyglycerol-modified silicone or a fatty acid polyglyceryl ester having 3 to 8 glycerol units.

[0031] In the present invention, the polyglycerin-modified silicone is represented by the following formula (II): [ka]

[0032] In formula (II), R1 represents a linear or branched alkyl group or phenyl group having 1 to 12 carbon atoms; R2 represents an alkylene group having 2 to 11 carbon atoms; p is a number from 10 to 120; and q is a number from 1 to 11.

[0033] The polyglycerin-modified silicone represented by formula (II) above can be obtained, for example, by adding an isopropyl chlorplatinate solution to a mixture of polyglycerin diallyl ether and dimethylpolysiloxane hydrogenated at one end, heating and reacting the mixture, adding an aqueous hydrochloric acid solution, performing superheat hydrolysis, neutralizing with sodium bicarbonate solution, purifying the mixture, and evaporating it. However, the polyglycerin-modified silicone according to the present invention is not limited to this manufacturing method.

[0034] In the present invention, examples of polyglycerin-modified silicones include, but are not limited to, bisbutyldimethicone polyglyceryl-3 as defined by its cosmetic labeling name.

[0035] Furthermore, the polyglycerin-modified silicone represented by formula (II) above may be a commercially available product.

[0036] In the present invention, fatty acid polyglyceryl esters having 3 to 8 glycerol units include esters of polyglycerol and branched or linear fatty acids.

[0037] Here, the fatty acids constituting the fatty acid polyglycerol ester may be selected from monohydroxy fatty acids having 12 to 22 carbon atoms. For example, saturated monounsaturated fatty acids such as isostearic acid and unsaturated monounsaturated fatty acids such as ricinoleic acid are preferred, and polymers of ricinoleic acid are particularly preferred.

[0038] In the present invention, specific examples of fatty acid polyglyceryl esters having 3 to 8 glycerol units include, but are not limited to, polyglyceryl-6 polyricinoleate.

[0039] (Sorbitan-based dispersant) In the present invention, sorbitan-based dispersants include sorbitan fatty acid esters. More specifically, examples include, but are not limited to, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan isostearate, sorbitan sesquiisostearate, sorbitan monooleate, sorbitan sesquioleate, and sorbitan trioleate.

[0040] In the composition of the present invention, the content of the dispersant is not particularly limited and may be, for example, 0.5% by mass or more, 0.6% by mass or more, 0.7% by mass or more, 0.8% by mass or more, 0.9% by mass or more, 1.0% by mass or more, 1.1% by mass or more, 1.2% by mass or more, 1.3% by mass or more, 1.4% by mass or more, 1.5% by mass or more, 1.6% by mass or more, 1.7% by mass or more, 1.8% by mass or more, 1.9% by mass or more, or 2.0% by mass or more, relative to the entire cosmetic composition. Alternatively, it may be 3.5% by mass or less, 3.2% by mass or less, 3.0% by mass or less, 2.8% by mass or less, 2.5% by mass or less, 2.2% by mass or less, or 2.0% by mass or less.

[0041] <Oil content> The composition of the present invention contains an oil. The oil contained in the composition of the present invention is an oil that can at least partially dissolve the compound I described above, and therefore can at least partially dissolve the compound I described above.

[0042] In the composition of the present invention, the oil content is not particularly limited and may be, for example, 5.0% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, 30% by mass or more, 35% by mass or more, 40% by mass or more, or 50% by mass or more, or 99.9% by mass or less, 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, 55% by mass or less, 50% by mass or less, 45% by mass or less, 40% by mass or less, 35% by mass or less, or 30% by mass or less.

[0043] In the present invention, the oil is not particularly limited as long as it can at least partially dissolve the compound I described above. More specifically, the oil may contain one or more polar oils, silicone oils, or hydrocarbon oils, for example. From the viewpoint of dissolving the compound I described above, it is preferable that the oil contains a polar oil.

[0044] (polar oil) In the present invention, "polar oil" refers to oils with high polarity among oils usable in cosmetics other than silicone oil, for example, those with an IOB value of 0.10 or higher, 0.11 or higher, 0.12 or higher, or 0.13 or higher. Furthermore, the IOB value of the polar oil according to the present invention may be 0.50 or lower, 0.45 or lower, or 0.40 or lower. The IOB value is an abbreviation for Inorganic / Organic Balance, and is a value that represents the ratio of the inorganic value to the organic value, and is an indicator of the degree of polarity of an organic compound. Specifically, the IOB value is expressed as IOB value = inorganic value / organic value. For each of the "inorganic value" and "organic value," for example, one carbon atom in a molecule has an "organic value" of 20, and one hydroxyl group has an "inorganic value" of 100. These values ​​are assigned according to the type of atom or functional group, and the IOB value of an organic compound can be calculated by summing the "inorganic value" and "organic value" of all atoms and functional groups in the organic compound (see, for example, Yoshio Koda, "Organic Concept Diagram - Fundamentals and Applications," pp. 11-17, Sankyo Publishing, 1984).

[0045] In this invention, oils used as ultraviolet absorbers with an IOB value of 0.10 or higher are excluded from the term "polar oil" as used herein.

[0046] In the present invention, the polar oil may be at least one selected from the group consisting of ester oils, ether oils, higher alcohols, and fatty acids, for example, having an IOB value of 0.10 or higher.

[0047] More specifically, polar oils include, for example, cyclohexane-1,4-dicarboxylic acid bisethoxydiglycol (IOB 1.03), phenoxyethyl caprylate (IOB 0.29), PPG-30 buteth-30 (IOB 0.94), diisopropyl sebacate (IOB 0.4), neopentyl glycol diheptanoate (IOB 0.33), diethylhexyl succinate (IOB 0.32), isononyl isononanoate (IOB 0.2), isopropyl myristate (IOB value = 0.18), octyl palmitate (IOB value = 0.13), palmitic acid Isopropyl (IOB value = 0.16), Butyl stearate (IOB value = 0.14), Hexyl laurate (IOB value = 0.17), Myristyl myristate (IOB value = 0.11), Decyl oleate (IOB value = 0.11), Isotridecyl isononanoate (IOB value = 0.15), Cetyl ethylhexanoate (IOB value = 0.13), Pentaerythrityl tetraethylhexanoate (IOB value = 0.35), Dioctyl succinate (IOB value = 0.36), Glycol distearate (IOB value = 0.16), Glyceryl diisostearate (IO IOB value = 0.29), neopentyl glycol dicaprate (IOB value = 0.25), diisostearyl malate (IOB value = 0.28), trimethylolpropane triisostearate (IOB value = 0.16), glyceryl tri-2-ethylhexanoate (triethylhexanoin) (IOB value = 0.35), trimethylolpropane trioctanoate (IOB value = 0.33), trimethylolpropane triisostearate (IOB value = 0.16), diisobutyl adipate (IOB value = 0.46), N-lauroyl-L-glutamic acid-2-octanoate The substance may be at least one selected from the group consisting of tydodecyl esters (IOB value = 0.29), 2-hexyldecyl adipic acid (IOB value = 0.16), ethylhexyl methoxycinnamate (IOB value = 0.28), 2-ethylhexyl palmitate (IOB value = 0.13), 2-ethylhexyl ethylhexanoate (IOB value = 0.2), triisostearin (IOB value = 0.16), PPG-3 dipivalate (IOB value = 0.52), and tri(caprylic / capric acid) glyceryl (IOB value = 0.33), but is not limited to these.

[0048] In the present invention, the amount of polar oil contained in the oil is not particularly limited, and may be 5.0 parts by mass or more, 10 parts by mass or more, 15 parts by mass or more, or 20 parts by mass or more per 100 parts by mass of the total oil, or 90 parts by mass or less, 80 parts by mass or less, 70 parts by mass or less, 60 parts by mass or less, 50 parts by mass or less, 40 parts by mass or less, 30 parts by mass or less, or 20 parts by mass or less.

[0049] Furthermore, if the oil component of the composition of the present invention includes a polar oil, the polar oil and compound I described above may be blended in the following compositional ratios. More specifically, per 100 parts by mass of the total of the polar oil and compound I, compound I may be blended in the following amounts: 0.01 parts by mass or more, 0.05 parts by mass or more, 0.1 parts by mass or more, 0.5 parts by mass or more, 1.0 parts by mass or more, 1.5 parts by mass or more, 2.0 parts by mass or more, 2.5 parts by mass or more, 3.0 parts by mass or more, 3.5 parts by mass or more, 4.0 parts by mass or more, 4.5 parts by mass or more, 5.0 parts by mass or more, 5.5 parts by mass or more, 6.0 parts by mass or more, 6 It may be 0.5 parts by mass or more, 7.0 parts by mass or more, 7.5 parts by mass or more, 8.0 parts by mass or more, 8.5 parts by mass or more, 9.0 parts by mass or more, 9.5 parts by mass or more, 10 parts by mass or more, 15 parts by mass or more, or 20 parts by mass or more, and may also be 50 parts by mass or less, 45 parts by mass or less, 40 parts by mass or less, 35 parts by mass or less, 30 parts by mass or less, 25 parts by mass or less, 20 parts by mass or less, 15 parts by mass or less, or 10 parts by mass or less.

[0050] (Silicone oil) In this invention, silicone oil refers to oils that can be used in cosmetics and have a main skeleton consisting of siloxane bonds.

[0051] In the present invention, the silicone oil may be a volatile silicone oil or a non-volatile silicone oil.

[0052] In this invention, the boiling point at 1 atmosphere (101.325 kPa) can be used as a guideline for "volatility." This boiling point may be, for example, 250°C or lower, 240°C or lower, or 230°C or lower, and may also be 80°C or higher, 100°C or higher, 120°C or higher, 150°C or higher, or 160°C or higher. Furthermore, in this disclosure, "non-volatile" means that when a sample is placed in a sufficiently large flat-bottomed dish and left at 105°C for 3 hours, the volatile content is 5% or less.

[0053] Furthermore, in the present invention, the silicone oil may be an acyclic silicone oil (i.e., a chain-like silicone oil) or a cyclic silicone oil.

[0054] Specific examples of silicone oils include, but are not limited to, acyclic silicone oils such as polydimethylsiloxane (dimethicone), trisiloxane, caprylyl methicone, methylphenylpolysiloxane, and methylhydrogenpolysiloxane, cyclic silicone oils such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane, and mixtures of two or more of these. Furthermore, from the viewpoint of feel during use, acyclic silicones are particularly preferred as silicone oils.

[0055] In the present invention, the amount of silicone oil contained in the oil is not particularly limited, and may be 5.0 parts by mass or more, 10 parts by mass or more, 15 parts by mass or more, or 20 parts by mass or more per 100 parts by mass of the total oil, or 90 parts by mass or less, 80 parts by mass or less, 70 parts by mass or less, 60 parts by mass or less, 50 parts by mass or less, 40 parts by mass or less, 30 parts by mass or less, or 20 parts by mass or less.

[0056] (Hydrogen oil) In the present invention, hydrocarbon oil refers to hydrocarbon oils other than the polar oils described above.

[0057] The hydrocarbon oil may be a volatile hydrocarbon oil or a non-volatile hydrocarbon oil.

[0058] Specific examples of hydrocarbon oils include, but are not limited to, decane, dodecane, isododecane, isohexadecane, liquid paraffin, squalane, squalene, paraffin, and mixtures of two or more of these.

[0059] <Uses and forms of the composition of the present invention> The compositions of the present invention can be suitably used as cosmetics or raw materials thereof. In particular, the present invention provides sunscreen cosmetic compositions.

[0060] The form of the composition of the present invention is not particularly limited and may be, for example, an oil-in-water emulsion cosmetic composition, an oil-in-oil emulsion cosmetic composition, an oily cosmetic composition based on an oil.

[0061] <Other ingredients> The cosmetic composition of the present invention may further contain any aqueous components or other components that can be used in the field of cosmetics, in addition to the components described above. Other components may include, but are not limited to, other ultraviolet absorbers, surfactants, humectants, metal ion chelating agents, natural and synthetic polymers, water-soluble and oil-soluble polymers, various extracts, colorants such as organic dyes, preservatives, antioxidants, pigments, thickeners, pH adjusters, fragrances, cooling agents, antiperspirants, bactericides, skin activators, other drugs, and various powders.

[0062] (Other UV absorbers) In the composition of the present invention, the ultraviolet absorber may further include other ultraviolet absorbers other than compound I described above.

[0063] In the present invention, other ultraviolet absorbers include, but are not limited to, benzoic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, dibenzoylmethane derivatives, β,β-diphenylacrylate derivatives, benzophenone derivatives, benzylidene camphor derivatives, phenylbenzimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, anthranyl derivatives, imidazoline derivatives, benzalmalonate derivatives, 4,4-diarylbutadiene derivatives, and the like.

[0064] (Surfactants) In the present invention, the surfactant may be one that functions as an emulsifier, or one that has both the function of an emulsifier and the function of a dispersant.

[0065] The surfactant is not particularly limited and includes, but is not limited to, PEG-10 dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, and lauryl PEG-9 polydimethylsiloxyethyl dimethicone.

[0066] In the composition of the present invention, the amount of surfactant present is not particularly limited, but is, for example, 1.0% by mass or more and 10% by mass or less.

[0067] (Water soluble component) The composition of the present invention may further contain a water-soluble component, such as a lower alcohol. Examples of lower alcohols include, but are not limited to, ethanol, propanol, butanol, pentanol, and hexanol.

[0068] Furthermore, the amount of water-soluble components present is not particularly limited and may be, for example, 1.0 to 10% by mass. [Examples]

[0069] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0070] Preparation of water-in-oil cosmetic compositions <Reference Examples 1-3, Comparative Examples 1-4, and Examples 1-4> Based on the compositions (mass%) shown in Table 1 below, the compositions for Reference Examples 1-3, Comparative Examples 1-4, and Examples 1-4 were prepared.

[0071] In Reference Examples 1 and 3, Examples 1 to 4, and Examples 5 to 20 described later, the compound I used was the compound shown in the following structural formula: [ka]

[0072] The ultraviolet absorption wavelength of each prepared composition was measured, and the integrated absorbance value in the 290-400 nm range (the entire UVA and UVB region) was calculated. Then, as shown in Table 1, the improvement in the ultraviolet absorption capacity of each composition was determined as the "boost rate," and this was calculated from the example that served as the "basis for calculating the boost rate" (the same method was used for other examples and comparative examples). The boost rate was calculated based on the following formula: Boost rate = (integrated absorbance value of the example to be calculated / integrated absorbance value of the example used as the basis for calculating the boost rate) × 100%

[0073] For example, the boost rate in Reference Example 1 was calculated using Reference Example 2 as the calculation basis. More specifically, the boost rate in Reference Example 1 = (integrated absorbance of Reference Example 1 / integrated absorbance of Reference Example 2) × 100%).

[0074] [Table 1]

[0075] The details of the "Other" components in Table 1 are as follows: • Diisopropyl sebacate (oil) 10% by mass Triethylhexanoin (oil) 10% by mass • Isododecane (oil) 10% by mass • Dimethicone (oil) 10% by mass • Ethanol 5.0% by mass Glycerin 1.0% by mass • Disteardimonium hectorite 0.5% by mass • Silica powder 5.0% by mass Phenoxyethanol 0.5% by mass • Sodium chloride 0.1% by mass ·EDTA-3Na 0.2% by mass

[0076] As is clear from Table 1, when compared to the composition of Reference Example 2, which uses octocrylene as the UV absorber, the boost rate of the composition of Reference Example 1, which uses compound I instead of octocrylene, was 100%. From this, it can be understood that the UV absorption capacity of the composition of Reference Example 1 and the composition of Reference Example 2 are of similar proportions. In other words, when UV scattering agent particles are not included, even when other dispersants (PEG-9 polydimethylsiloxyethyl dimethicone) are included, the UV absorption capacity of compound I is comparable to that of octocrylene, a conventional UV absorber, in terms of the cumulative absorbance value in the entire UVA and UVB region.

[0077] Furthermore, compared to the composition of Reference Example 1, the boost rate of the composition of Reference Example 3, which uses polyhydroxystearic acid, one of the specific dispersants of the present invention, as a dispersant, was 100%. From this, it can be understood that the ultraviolet absorption capacity of the composition of Reference Example 3 is about the same as that of the composition of Reference Example 1. In other words, even if the specific dispersant of the present invention is further included, the ultraviolet absorption capacity of compound I is about the same as that of octocrylene, a conventional ultraviolet absorber, in terms of the cumulative absorbance value in the entire UVA and UVB region, when ultraviolet scattering agent particles are not included.

[0078] Furthermore, when the composition contained 7.0% by mass of UV scattering agent particles, the compositions of Comparative Examples 1 and 2 showed only slight improvement in UV absorption capacity compared to the composition of Reference Example 1. In this case, the UV absorption capacity of the composition of Comparative Example 1, which used polyhydroxystearic acid, one of the specific dispersants of the present invention, in addition to other dispersants (PEG-9 polydimethylsiloxyethyl dimethicone), was about the same as that of the composition of Comparative Example 2, which used isostearic acid, one of the specific dispersants of the present invention, in addition to other dispersants (PEG-9 polydimethylsiloxyethyl dimethicone). In other words, even when the composition contains 7.0% by mass of UV scattering agent particles and the specific dispersant of the present invention, it is understood that the UV absorption capacity of compound I is about the same as that of octocrylene, a conventional UV absorber, in terms of the cumulative absorbance value in the entire UVA and UVB region.

[0079] On the other hand, when the content of ultraviolet scattering agent particles in the composition was further increased to 10% by mass, the compositions of Examples 1 and 2 using Compound I showed a greater boost rate compared to the compositions of Comparative Examples 3 and 4 using octocrylene (i.e., the overall ultraviolet absorption capacity in the UVA and UVB regions was greatly improved). From this, it can be understood that when the amount of ultraviolet scattering agent particles in the composition is relatively high (for example, more than 7.0% by mass), the ultraviolet absorption capacity is greatly improved by including the specific dispersant of the present invention and using Compound I instead of octocrylene.

[0080] Furthermore, compared to Example 2, in which isostearic acid was used as the specific dispersant of the present invention, the composition of Example 1, in which polyhydroxystearic acid was used as the specific dispersant of the present invention, showed a greater boost rate (i.e., the overall ultraviolet absorption capacity in the UVA and UVB regions was greatly improved). From this, it can be understood that a synergistic effect between compound I and the specific dispersant of the present invention (e.g., polyhydroxystearic acid) occurs only when the content of ultraviolet scattering agent particles in the composition is above a certain level, and this greatly improves the ultraviolet absorption capacity of the composition.

[0081] In contrast, the boost rates of the compositions of Comparative Examples 3 and 4 using octocrylene were similar whether polyhydroxystearic acid was used as the specific dispersant of the present invention in addition to other dispersants (PEG-9 polydimethylsiloxyethyl dimethicone) (Comparative Example 3) or whether isostearic acid was used as the specific dispersant of the present invention in addition to other dispersants (PEG-9 polydimethylsiloxyethyl dimethicone) (Comparative Example 4). From this, it can be understood that even if the content of ultraviolet scattering agent particles in the composition is above a certain level, there is no synergistic effect with the combination of octocrylene, a conventional ultraviolet absorber, and a dispersant.

[0082] Furthermore, when the content of UV scattering agent particles in the composition was further increased to 15% by mass, the boost rate of compositions in both Examples 3 and 4 increased even further (i.e., the overall UV absorption capacity in the UVA and UVB regions was further greatly improved). This suggests that the greater the content of UV scattering agent particles in the composition (exceeding 7.0% by mass), the greater the improvement in UV absorption capacity by compound I. It also suggests that when the amount of UV scattering agent particles in the composition is relatively high (for example, more than 7.0% by mass), a synergistic effect occurs when compound I is combined with a specific dispersant.

[0083] <Comparative Examples 5 and 6> Based on the composition (mass%) shown in Table 1 below, compositions for Comparative Examples 5 and 6 were prepared.

[0084] The ultraviolet absorption wavelength of each prepared composition was measured, and the integrated absorbance value in the 290-400 nm range (the entire UVA and UVB region) was determined. Then, using Comparative Example 5 as a reference, the boost rates for Comparative Example 3, Example 1, and Comparative Example 6 were determined, and the results are shown in Table 2. The details of the "Other" components in Table 2 are the same as in Table 1 described above.

[0085] [Table 2]

[0086] As is clear from Table 2, even when the composition contained 10% by mass of UV scattering agent particles, the composition of Comparative Example 6 using Compound I had a low boost rate because it did not contain a dispersant. From this, it can be understood that when the content of UV scattering agent particles in a composition is above a certain level, it is necessary to use Compound I in combination with a dispersant in order to improve the UV absorption capacity of the composition.

[0087] <Examples 5-7 and Comparative Examples 7-13> Based on the compositions shown in Tables 3 and 4 below, the compositions of Examples 5-7 and Comparative Examples 7-13 were prepared. The compositions of Comparative Examples 8-13 have similar compositions to those of Examples 2, 5, 6, 1, and 7, and Comparative Example 7, except that they do not contain "Compound I" and instead have an increased amount of water.

[0088] The improvement in UV absorption capacity of the compositions in Examples 2, 5, 6, 1, and 7, and Comparative Example 7, was determined as the "boost rate." The results are shown in Table 3. When calculating the boost rate, Comparative Examples 8 to 13 were used as references for Examples 2, 5, 6, 1, and 7, and Comparative Example 7, respectively.

[0089] [Table 3]

[0090] [Table 4]

[0091] The details of the "Other" components in Tables 3 and 4 are the same as those in Table 1 described above.

[0092] As is clear from Table 3, the compositions of Examples 2, 5, 6, 1, and 7, which contain compound I, all showed a greater boost rate (i.e., a significant improvement in overall UVA and UVB absorption capacity) compared to Comparative Examples 8-12, which do not contain compound I.

[0093] Furthermore, it was found that the compositions of Examples 2, 5, 6, 1, and 7, which contained different types of dispersants, showed different effects in improving UV absorption capacity depending on the type of dispersant. In particular, the compositions of Examples 2, 5, 6, 1, and 7, which used isostearic acid, sorbitan sesquiisostearate, bisbutyldimethicone polyglyceryl-3, and polyhydroxystearic acid and polyglyceryl-6 polyricinoleate as dispersants, respectively, showed a greater boost rate (i.e., a greater improvement in overall UV absorption capacity in the UVA and UVB regions).

[0094] Preparation of oil-based cosmetic compositions <Examples 8-12, Comparative Examples 14-20> Based on the compositions (mass%) shown in Tables 5 and 6 below, compositions for Examples 8-12 and Comparative Examples 13-20 were prepared. The compositions for Comparative Examples 15-20 have the same composition as those for Examples 8-12 and Comparative Example 14, except that they do not contain "Compound I" and instead have an increased oil content.

[0095] The improvement in UV absorption capacity of the compositions in Examples 8-13 and Comparative Example 15 was determined as the "boost rate." The results are shown in Table 5. When calculating the boost rate, Comparative Examples 15-20 were used as the baseline for Examples 8-13 and Comparative Example 15, respectively.

[0096] [Table 5]

[0097] [Table 6]

[0098] The details of the "Other" components in Tables 5 and 6 are as follows: • Ethanol 5.0% by mass Glycerin 1.0% by mass • Hydroxystearic acid 6.0% by mass • Polyamide-8, tetra(di-t-butylhydroxyhydrocinnamate) pentaerythrityl 2.0% by mass • Dibutyl lauroyl glutamide 2.0% by mass • Silica powder 5.0% by mass

[0099] As is clear from Table 5, the compositions of Examples 8 to 12, which contain compound I, all showed a greater boost rate compared to Comparative Examples 15 to 19, which do not contain compound I (i.e., the overall ultraviolet absorption capacity in the UVA and UVB regions was greatly improved).

[0100] Furthermore, it was found that the compositions of Examples 8 to 12, which contained different types of dispersants, showed different effects in improving UV absorption capacity depending on the type of dispersant. Of these, in particular, the compositions of Examples 8 to 124, which used isostearic acid, sorbitan sesquiisostearate, bisbutyldimethicone polyglyceryl-3, and polyhydroxystearic acid and polyglyceryl-6 polyricinoleate as dispersants, respectively, showed a greater boost rate (i.e., a significant improvement in overall UV absorption capacity in the UVA and UVB regions).

[0101] Preparation of Oil-in-Water Cosmetic Compositions <Examples 13-17, Comparative Examples 21-27> Based on the compositions shown in Tables 7 and 8 below, the compositions of Examples 13-17 and Comparative Examples 21-27 were prepared. The compositions of Comparative Examples 22-27 have the same composition as those of Examples 13-17 and Comparative Example 21, except that they do not contain "Compound I" and instead have an increased amount of water.

[0102] The improvement in UV absorption capacity of the compositions in Examples 13-17 and Comparative Example 21 was determined as the "boost rate." The results are shown in Table 7. When calculating the boost rate, Comparative Examples 22-27 were used as references for Examples 13-17 and Comparative Example 21, respectively.

[0103] [Table 7]

[0104] [Table 8]

[0105] The details of the "Other" components in Tables 7 and 8 are as follows: Glycerin 4.0% by mass • 1,3-Butylene glycol 7.0% by mass • Succinoglycan 0.12% by mass • Sucrose fatty acid ester 3.0% by mass • (Dimethylacrylamide / Sodium Acryloyldimethyltaurate) Crosspolymer 0.6% by mass • Diisopropyl sebacate 4.0% by mass Non-volatile dimethicone 2.0% by mass ·PPG-17 1.0% by mass • Cyclomethicone 12% by mass Triethylhexanoin 5.0% by mass • Silica powder 5.0% by mass

[0106] Furthermore, the details of "buffers" in Tables 7 and 8 are as follows: Citric acid: appropriate amount Sodium citrate: appropriate amount EDTA-3Na: Appropriate amount

[0107] As is clear from Table 7, the compositions of Examples 13 to 17, which contain compound I, all showed a greater boost rate compared to Comparative Examples 20 to 25, which do not contain compound I (i.e., the overall ultraviolet absorption capacity in the UVA and UVB regions was greatly improved).

[0108] Furthermore, it was found that the compositions of Examples 13 to 17, which contained different types of dispersants, showed different effects in improving UV absorption capacity depending on the type of dispersant. Of these, the compositions of Examples 13 to 17 that used isostearic acid, sorbitan sesquiisostearate, bisbutyldimethicone polyglyceryl-3, and polyhydroxystearic acid and polyglyceryl-6 polyricinoleate as dispersants, respectively, showed a greater boost rate (i.e., a significant improvement in overall UV absorption capacity in the UVA and UVB regions).

Claims

1. The following components (i) to (iii), and an oil capable of dissolving component (i) at least partially, (i) Compound I having the structure of the following formula (I): 【Chemistry 1】 (In the formula, -OA represents an alkoxy group.) (ii) UV scattering agent particles, and (iii) Dispersant, The content of the ultraviolet scattering agent particles is more than 7.0% by mass, and The dispersant comprises at least one dispersant selected from the group consisting of polyhydroxystearic acid, isostearic acid, polyglyceryl-based dispersants, and sorbitan-based dispersants. Cosmetic composition.

2. The composition according to claim 1, wherein the content of the ultraviolet scattering agent particles is 10% by mass or more.

3. The composition according to claim 1, wherein the dispersant comprises at least one dispersant selected from the group consisting of polyhydroxystearic acid and the polyglyceryl-based dispersants.

4. The composition according to claim 1, wherein the polyglyceryl dispersant is a polyglycerol-modified silicone or a fatty acid polyglyceryl ester having 3 to 8 glycerol units.

5. The composition according to claim 1, wherein the content of the dispersant is 0.5% by mass or more and 3.5% by mass or less.

6. The composition according to claim 1, wherein the oil component includes a polar oil.

7. The composition according to any one of claims 1 to 6, which is an oil-in-water cosmetic.

8. The composition according to any one of claims 1 to 6, which is a water-in-oil cosmetic.

9. The composition according to any one of claims 1 to 6, which is an oil-based cosmetic.

10. A sunscreen cosmetic composition according to any one of claims 1 to 6.

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