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

Cosmetic composition

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

[0002] Protecting skin from UV rays is an important issue in skin care and body care. Not only mid-wavelength UV rays (UVB region: wavelength 290-320 nm), which are known to cause sunburn and inflammation, but also long-wavelength UV rays (UVA region: wavelength 320-400 nm), are known to have effects on the skin (such as photoaging).

[0003] Conventional cosmetics for UV protection often contain 2-ethylhexyl p-methoxycinnamate as an ultraviolet absorber. Although 2-ethylhexyl p-methoxycinnamate has the effect of absorbing ultraviolet rays in the UVB region, there is a demand for ultraviolet absorbers with better ultraviolet absorption ability in the UVA region.

[0004] In contrast to this, the ultraviolet absorber disclosed in Patent Document 1 is said to have an unprecedented property in that it has an absorption capacity in both the UVA region and the UVB region, has an ultraviolet suppression effect over a wide range of wavelengths, and increases its ultraviolet absorption capacity in the UVA and UVB regions with the passage of time during ultraviolet irradiation.

[0005] More specifically, the ultraviolet absorber of Patent Document 1 is represented by the general formula I: (wherein -OA represents an alkoxy group) as an active ingredient.

[0006] International Publication No. 2009 / 041098

[0007] However, when the integrated absorbance values ​​at 290 to 400 nm (the entire UVA and UVB regions) of a conventional cosmetic containing a conventional UV absorber (e.g., octocrylene) and a cosmetic using the compound of Patent Document 1 instead of this conventional UV absorber were compared, no significant difference was found between these cosmetic compositions.

[0008] Therefore, there is still room for improvement in the cosmetic composition containing the ultraviolet absorber of Patent Document 1 in terms of its ultraviolet absorption ability across the entire UVA and UVB ranges.

[0009] The present invention is intended to improve the above situation, and its object is to provide a cosmetic composition having improved ultraviolet absorbing ability over the entire UVA and UVB ranges.

[0010] The present invention that achieves the above object is as follows.

[0011] <Aspect 1> A composition comprising the following components (i) to (iii) and an oil capable of at least partially dissolving the component (i), wherein: (i) a compound I having the structure of the following formula (I): (wherein -OA represents an alkoxy group), (ii) ultraviolet scattering agent particles, and (iii) a dispersant, wherein the content of the ultraviolet scattering agent particles is greater 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. 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 dispersants. Aspect 4: The composition according to any one of Aspects 1 to 3, wherein the polyglyceryl-based dispersant is a 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 oil-based cosmetic. <Aspect 10> The composition according to any one of Aspects 1 to 9, which is a sunscreen cosmetic composition.

[0012] According to the present invention, it is possible to provide a cosmetic composition having an improved ultraviolet absorbing ability over the entire UVA and UVB ranges.

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the preferred embodiments. However, the present invention is not limited to the following embodiments, and various modifications can be made within the scope of the present invention.

[0014] Cosmetic Composition The cosmetic composition of the present invention (hereinafter also referred to simply as "the composition of the present invention") contains the following components (i) to (iii), and an oil component capable of at least partially dissolving component (i), and the composition comprises: (i) a compound I having a structure of the following formula (I): (wherein -OA represents an alkoxy group), (ii) ultraviolet scattering agent particles, and (iii) a dispersant, wherein the content of the ultraviolet 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, polyglyceryl-based dispersants, and sorbitan-based dispersants.

[0015] Through extensive research, the present inventors have unexpectedly found that when a specific dispersant is contained and the amount of ultraviolet scattering agent particles in a cosmetic composition is relatively large (for example, greater than 7.0% by mass), the integrated value of absorbance in the range of 290 to 400 nm (i.e., ultraviolet absorption ability across the entire UVA and UVB regions) is significantly improved by using compound I having the structure of formula (I) above as an ultraviolet absorber instead of a conventional ultraviolet absorber.

[0016] <Component (i): Compound I> Compound I according to the present invention has the structure of the following formula (I): (wherein —OA represents an alkoxy group)

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

[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 exerting the effects of the present invention, it is preferred that Compound I is at least partially dissolved, particularly 50% by mass or more dissolved, more particularly 90% by mass or more dissolved, even more particularly 99% by mass or more dissolved, and most particularly 100% by mass dissolved.

[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, and may be 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, for example, relative to the entire cosmetic composition.

[0021] <Component (ii): Ultraviolet Scattering Agent Particles> The ultraviolet scattering agent particles contained in the composition of the present invention can enhance the ultraviolet protection effect. In the present invention, the ultraviolet scattering agent particles are not particularly limited and may be, for example, particles of at least one metal oxide selected from the group consisting of titanium oxide, zinc oxide, iron oxide, and cerium oxide.

[0022] The ultraviolet scattering agent particles may also be hydrophobized. Here, the hydrophobization treatment may be carried out using a known surface treatment agent for hydrophobization, and examples thereof 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, and silazane compound treatment. Among these treatments, fatty acid treatment with dextrin palmitate, aluminum stearate, or the like, and silicone treatment are preferred from the viewpoint of dispersion stability, etc.

[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 diameter of a circle equivalent to the projected area of ​​the primary particles in an SEM image.

[0024] The shape of the ultraviolet scattering agent particles is not particularly limited, and examples thereof include spherical, plate-like, rod-like, spindle-like, needle-like, and irregular shapes.

[0025] In the composition of the present invention, the content of the ultraviolet scattering agent particles is more than 7.0% by mass relative to the total cosmetic composition, and more specifically, it may be, for example, more 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 the ultraviolet scattering agent particles is not particularly limited, and may be, for example, 30% by mass or less, 20% by mass or less, or 18% by mass or less relative to the total cosmetic composition.

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

[0027] Furthermore, the present inventors have unexpectedly found that the integrated value of absorbance in the range of 290 to 400 nm of the composition can be further improved by using a specific dispersant described below as a dispersant for dispersing ultraviolet scattering agent particles.

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

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

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

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

[0032] In formula (II), R １ represents a linear or branched alkyl group having 1 to 12 carbon atoms or a phenyl group; R ２ 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 a solution of chloroplatinic acid in isopropyl alcohol to a mixed liquid of polyglycerin diallyl ether and one-end hydrogenated dimethylpolysiloxane, heating and reacting the mixture, adding an aqueous hydrochloric acid solution to the mixture, subjecting the mixture to thermal hydrolysis, adding aqueous sodium bicarbonate to neutralize the mixture, purifying the mixture, and evaporating the mixture. However, the polyglycerin-modified silicone according to the present invention is not limited to this production method.

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

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

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

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

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

[0039] (Sorbitan-based dispersants) In the present invention, examples of 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, and 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, relative to the entire cosmetic composition.

[0041] <Oil> 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 above-mentioned compound I, and therefore can at least partially dissolve the above-mentioned compound I.

[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, and may be 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 component is not particularly limited as long as it can at least partially dissolve the above-mentioned compound I. More specifically, the oil component may contain, for example, one or more of polar oil, silicone oil, hydrocarbon oil, etc. From the viewpoint of dissolving the above-mentioned compound I, it is preferable that the oil component contains a polar oil.

[0044] (Polar Oil) In the present invention, "polar oil" refers to an oil with high polarity among oils that can be used in cosmetics other than silicone oil, and refers to, for example, an oil with an IOB value of 0.10 or more, 0.11 or more, 0.12 or more, or 0.13 or more. Furthermore, the IOB value of the polar oil according to the present invention may be 0.50 or less, 0.45 or less, or 0.40 or less. The IOB value is an abbreviation for Inorganic / Organic Balance (inorganic / organic ratio), and is a value that represents the ratio of the inorganic value to the organic value, and is an index that indicates the degree of polarity of an organic compound. Specifically, the IOB value is expressed as IOB value = inorganic value / organic value. The "inorganic value" and "organic value" are set according to the type of atom or functional group, such as 20 for one carbon atom in a molecule and 100 for one hydroxyl group. The IOB value of an organic compound can be calculated by integrating the "inorganic values" and "organic values" of all atoms and functional groups in the organic compound (see, for example, "Organic Conceptual Diagram - Fundamentals and Applications" by Yoshio Koda, pp. 11-17, Sankyo Publishing, 1984).

[0045] In the present invention, oils having an IOB value of 0.10 or more and used as ultraviolet absorbents are excluded from the term "polar oil" herein.

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

[0047] More specifically, polar oils include, for example, bisethoxydiglycol cyclohexane-1,4-dicarboxylate (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 (IOB value = 0.18), 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-glutamate-2-octyl The alkyl acrylate may be at least one selected from the group consisting of ethyldodecyl ester (IOB value=0.29), 2-hexyldecyl adipate (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 caprylic / capric triglyceride (IOB value=0.33), but is not limited thereto.

[0048] In the present invention, the amount of polar oil contained in the oil content is not particularly limited, and may be, for example, 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, relative to 100 parts by mass of the total oil content, and may be 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, when the oil component of the composition of the present invention contains a polar oil, the polar oil and the above-mentioned compound I may be blended in the following composition ratios. More specifically, with respect to 100 parts by mass of the total of the polar oil and compound I, the compound I may be blended in an amount of 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 ... 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 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 the present invention, silicone oil refers to oils that can be used in cosmetics and have a main skeleton formed by siloxane bonds.

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

[0052] In the present invention, the boiling point at 1 atmosphere (101.325 kPa) can be used as an indicator of "volatility." This boiling point may be, for example, 250°C or less, 240°C or less, or 230°C or less, or 80°C or more, 100°C or more, 120°C or more, 150°C or more, or 160°C or more. In the present disclosure, "non-volatile" refers to a substance that exhibits a volatile content of 5% or less when a sample is placed in a sufficiently large flat-bottomed dish and left at 105°C for 3 hours.

[0053] In the present invention, the silicone oil may be a non-cyclic silicone oil (i.e., a chain 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 thereof. Furthermore, from the viewpoint of texture when used, acyclic silicone oils are particularly preferred.

[0055] In the present invention, the amount of silicone oil contained in the oil content is not particularly limited, and may be, for example, 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, relative to 100 parts by mass of the total oil content, and may be 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] (Hydrocarbon Oil) In the present invention, the hydrocarbon oil refers to a hydrocarbon oil other than the above-mentioned polar oils.

[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 thereof.

[0059] <Uses and Forms of the Composition of the Present Invention> The composition of the present invention can be suitably used as a cosmetic or a raw material thereof. That is, the present invention particularly provides a sunscreen cosmetic composition.

[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, a water-in-oil emulsion cosmetic composition, or an oil-based cosmetic composition.

[0061] Other Components The cosmetic composition of the present invention may further contain any aqueous or other components that can be used in the cosmetic field, in addition to the components described above. Examples of other components include, but are not limited to, other UV absorbers, surfactants, moisturizers, sequestering agents, natural and synthetic polymers, water-soluble and oil-soluble polymers, various extracts, coloring agents such as organic dyes, preservatives, antioxidants, pigments, thickeners, pH adjusters, fragrances, cooling agents, antiperspirants, disinfectants, skin activators, other drugs, and various powders.

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

[0063] In the present invention, examples of 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, anthranil derivatives, imidazoline derivatives, benzalmalonate derivatives, and 4,4-diarylbutadiene derivatives.

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

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

[0066] In the composition of the present invention, when a surfactant is contained, the content thereof is not particularly limited and is, for example, from 1.0% by mass to 10% by mass.

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

[0068] Furthermore, when a water-soluble component is contained, its content is not particularly limited and may be, for example, 1.0 to 10% by mass.

[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 to 3, Comparative Examples 1 to 4, and Examples 1 to 4> Based on the compositions (mass%) in Table 1 below, the compositions of Reference Examples 1 to 3, Comparative Examples 1 to 4, and Examples 1 to 4 were prepared.

[0071] In Reference Examples 1 and 3, Examples 1 to 4, and Examples 5 to 20 described below, the compound I used was a compound represented by the following structural formula:

[0072] The ultraviolet absorption wavelength of each composition prepared was measured, and the integrated value of absorbance in the range of 290 to 400 nm (the entire UVA and UVB region) was calculated. Then, as shown in Table 1, the improvement effect of the ultraviolet absorption ability of each composition was determined as a "boost rate" from the example serving as the "calculation standard for the boost rate" (hereinafter, the other examples and comparative examples were calculated in the same manner). The boost rate was calculated based on the following formula: Boost rate = (integrated value of absorbance of the example to be determined / integrated value of absorbance of the example serving as the calculation standard for the boost rate) × 100%

[0073] For example, the boost rate of Reference Example 1 was calculated based on that of Reference Example 2. More specifically, the boost rate of Reference Example 1 = (integrated value of absorbance of Reference Example 1 / integrated value of absorbance of Reference Example 2) × 100%).

[0074]

[0075] The details of the "other" ingredients 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 the composition of Reference Example 2 using octocrylene as the UV absorber is used as the standard, the boost rate of the composition of Reference Example 1 using Compound I instead of octocrylene was 100%. This shows that the UV absorption ability of the composition of Reference Example 1 is comparable to that of the composition of Reference Example 2, that is, when no UV scattering agent particles are contained, even if another dispersant (PEG-9 polydimethylsiloxyethyl dimethicone) is contained, the UV absorption ability of Compound I is comparable to that of the conventional UV absorber octocrylene in terms of the integrated value of absorbance over the entire UVA and UVB ranges.

[0077] Furthermore, the boost rate of the composition of Reference Example 3, which used polyhydroxystearic acid, one of the specific dispersants of the present invention, as a dispersant, was 100% when the composition of Reference Example 1 was used as the standard. This shows that the ultraviolet absorption ability of the composition of Reference Example 3 is comparable to that of the composition of Reference Example 1, i.e., when no ultraviolet scattering agent particles are contained, even if the specific dispersant of the present invention is further contained, the ultraviolet absorption ability of Compound I is comparable to that of octocrylene, a conventional ultraviolet absorber, in terms of the integrated value of absorbance over the entire UVA and UVB ranges.

[0078] Furthermore, when the composition contained 7.0% by mass of ultraviolet scattering agent particles, the compositions of Comparative Examples 1 and 2 both showed a slight improvement in ultraviolet absorption ability compared to the composition of Reference Example 1. Furthermore, in this case, the ultraviolet absorption ability of the composition of Comparative Example 1, which used polyhydroxystearic acid, one of the specific dispersants of the present invention, in addition to another dispersant (PEG-9 polydimethylsiloxyethyl dimethicone) as a dispersant, was comparable to the ultraviolet absorption ability of the composition of Comparative Example 2, which used isostearic acid, one of the specific dispersants of the present invention, in addition to another dispersant (PEG-9 polydimethylsiloxyethyl dimethicone) as a dispersant. In other words, even when the composition contained 7.0% by mass of ultraviolet scattering agent particles and the specific dispersant of the present invention, it can be seen that the ultraviolet absorption ability of Compound I was comparable to that of octocrylene, a conventional ultraviolet absorber, in terms of the integrated value of absorbance across the entire UVA and UVB regions.

[0079] On the other hand, when the content of the ultraviolet scattering agent particles in the composition was further increased to 10% by mass, the compositions of Examples 1 and 2 using Compound I exhibited a larger boost rate (i.e., the ultraviolet absorption ability was greatly improved across the entire UVA and UVB ranges) compared to the compositions of Comparative Examples 3 and 4 using octocrylene. This demonstrates that when the content of the ultraviolet scattering agent particles in the composition is relatively high (for example, greater than 7.0% by mass), the ultraviolet absorption ability is greatly improved by including the specific dispersant of the present invention and using Compound I instead of octocrylene.

[0080] Furthermore, compared with 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, had a larger boost rate (i.e., the ultraviolet absorption ability was greatly improved across the entire UVA and UVB ranges). From this, it can be seen that a synergistic effect between Compound I and the specific dispersant of the present invention (e.g., polyhydroxystearic acid) is produced only when the content of ultraviolet scattering agent particles in the composition is at a certain level or higher, thereby greatly improving the ultraviolet absorption ability of the composition.

[0081] In contrast, the compositions of Comparative Examples 3 and 4 using octocrylene showed similar boost rates when polyhydroxystearic acid was used as the specific dispersant of the present invention in addition to another dispersant (PEG-9 polydimethylsiloxyethyl dimethicone) (Comparative Example 3) and when isostearic acid was used as the specific dispersant of the present invention in addition to another dispersant (PEG-9 polydimethylsiloxyethyl dimethicone) (Comparative Example 4). This demonstrates that there is no synergistic effect when combining octocrylene, a conventional UV absorber, with a dispersant, even if the content of UV scattering agent particles in the composition is above a certain level.

[0082] When the content of the ultraviolet scattering agent particles in the composition was further increased to 15% by mass, the boost rate of both the compositions of Examples 3 and 4 was further increased (i.e., the ultraviolet absorption ability across the entire UVA and UVB ranges was further improved). This suggests that the effect of improving the ultraviolet absorption ability by Compound I is more significantly improved as the content of the ultraviolet scattering agent particles in the composition increases beyond 7.0% by mass. It also suggests that when the content of the ultraviolet scattering agent particles in the composition is relatively high (for example, when it exceeds 7.0% by mass), a synergistic effect is also produced by combining Compound I with a specific dispersant.

[0083] Comparative Examples 5 and 6 Compositions of Comparative Examples 5 and 6 were prepared based on the compositions (mass %) in Table 1 below.

[0084] The ultraviolet absorption wavelength of each of the prepared compositions was measured, and the integrated value of absorbance in the range of 290 to 400 nm (the entire UVA and UVB region) was calculated. Then, the boost rate of each of Comparative Example 3, Example 1, and Comparative Example 6 was calculated based on Comparative Example 5, and the results are shown in Table 2. The details of the "other" components in Table 2 are the same as those in Table 1 above.

[0085]

[0086] As is clear from Table 2, even when the content of ultraviolet scattering agent particles in the composition was 10% by mass, the composition of Comparative Example 6 using Compound I did not contain a dispersant, and therefore its boost rate was low. From this, it can be understood that when the content of ultraviolet scattering agent particles in the composition is equal to or higher than a certain level, it is necessary to use Compound I in combination with a dispersant in order to improve the ultraviolet absorption ability of the composition.

[0087] Examples 5 to 7 and Comparative Examples 7 to 13 Compositions of Examples 5 to 7 and Comparative Examples 7 to 13 were prepared based on the formulations in the following Tables 3 and 4. The compositions of Comparative Examples 8 to 13 each have the same composition as the compositions of Examples 2, 5, 6, 1, and 7 and Comparative Example 7, except that they do not contain "Compound I" and instead the amount of water is increased accordingly.

[0088] The improvement effect of the ultraviolet absorbing ability of each of the compositions of Examples 2, 5, 6, 1, and 7, and Comparative Example 7 was determined as a "boost rate." The results are shown in Table 3. When calculating the boost rate, Comparative Examples 8 to 13 were used as the standard for Examples 2, 5, 6, 1, and 7, and Comparative Example 7, respectively.

[0089]

[0090]

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

[0092] As is clear from Table 3, the compositions of Examples 2, 5, 6, 1, and 7, which contained Compound I, all had a higher boost rate (i.e., the ultraviolet absorption ability was greatly improved across the entire UVA and UVB ranges) compared to Comparative Examples 8 to 12, which did not contain Compound I.

[0093] It was also found that the compositions of Examples 2, 5, 6, 1, and 7, which contained different types of dispersants, had different effects on improving UV absorption ability depending on the type of dispersant. Among these, the compositions of Examples 2, 5, 6, 1, and 7, which used isostearic acid, sorbitan sesquiisostearate, bisbutyldimethicone polyglyceryl-3, and polyhydroxystearic acid, polyglyceryl-6 polyricinoleate, respectively, had a larger boost rate (i.e., the UV absorption ability was greatly improved across the entire UVA and UVB ranges).

[0094] Preparation of Oil-Based Cosmetic Compositions Examples 8 to 12, Comparative Examples 14 to 20 Compositions of Examples 8 to 12 and Comparative Examples 13 to 20 were prepared based on the compositions (mass%) in Tables 5 and 6 below. The compositions of Comparative Examples 15 to 20 each have the same composition as the compositions of Examples 8 to 12 and Comparative Example 14, except that they do not contain "Compound I" and instead have an increased amount of oil to compensate for this.

[0095] The improvement effect of the ultraviolet absorbing ability of each of the compositions of Examples 8 to 13 and Comparative Example 15 was determined as a "boost rate." The results are shown in Table 5. When calculating the boost rate, Comparative Examples 15 to 20 were used as the standard for Examples 8 to 13 and Comparative Example 15, respectively.

[0096]

[0097]

[0098] The details of the "other" ingredients 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, pentaerythrityl tetra(di-t-butylhydroxyhydrocinnamate) 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 containing Compound I all had a higher boost rate (i.e., the ultraviolet absorption ability was greatly improved across the entire UVA and UVB ranges) compared to Comparative Examples 15 to 19 which did not contain Compound I.

[0100] Furthermore, it was found that the compositions of Examples 8 to 12, which contained different types of dispersants, had different effects on improving UV absorption ability depending on the type of dispersant. Among these, the compositions of Examples 8 to 124, which used isostearic acid, sorbitan sesquiisostearate, bisbutyldimethicone polyglyceryl-3, and polyhydroxystearic acid, polyglyceryl-6 polyricinoleate, respectively, as dispersants, had a larger boost rate (i.e., the UV absorption ability was greatly improved across the entire UVA and UVB ranges).

[0101] Preparation of Oil-in-Water Cosmetic Compositions Examples 13 to 17, Comparative Examples 21 to 27 The compositions of Examples 13 to 17 and Comparative Examples 21 to 27 were prepared based on the formulations in the following Tables 7 and 8. The compositions of Comparative Examples 22 to 27 each have the same formulation as the compositions of Examples 13 to 17 and Comparative Example 21, except that they do not contain "Compound I" and instead contain an increased amount of water.

[0102] The improvement effect of the ultraviolet absorbing ability of each of the compositions of Examples 13 to 17 and Comparative Example 21 was determined as a "boost rate." The results are shown in Table 7. When calculating the boost rate, Comparative Examples 22 to 27 were used as the standard for Examples 13 to 17 and Comparative Example 21, respectively.

[0103]

[0104]

[0105] The details of the "other" ingredients 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] The details of "buffer" 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 containing Compound I all had a higher boost rate (i.e., the ultraviolet absorption ability was greatly improved across the entire UVA and UVB ranges) compared to Comparative Examples 20 to 25 which did not contain Compound I.

[0108] Furthermore, it was found that the compositions of Examples 13 to 17, which contained different types of dispersants, had different effects on improving UV absorption ability depending on the type of dispersant. Among these, the compositions of Examples 13 to 17, which used isostearic acid, sorbitan sesquiisostearate, bisbutyldimethicone polyglyceryl-3, and polyhydroxystearic acid, polyglyceryl-6 polyricinoleate, respectively, as dispersants, had a larger boost rate (i.e., the UV absorption ability was greatly improved across the entire UVA and UVB ranges).

Claims

Claim 1 containing the following components (i) to (iii) and an oil component capable of at least partially dissolving component (i): (i) Compound I having the structure of the following formula (I): 【Chemical 1】 (In the formula, -OA represents an alkoxy group) (ii) Ultraviolet scattering agent particles, and (iii) a dispersant, the content of the ultraviolet scattering agent particles being more than 7.0% by mass and the dispersant containing at least one dispersant selected from the group consisting of polyhydroxystearic acid, isostearic acid, polyglyceryl-based dispersants, and sorbitan-based dispersants, a cosmetic composition. Claim 2 The composition according to claim 1, wherein the content of the ultraviolet scattering agent particles is 10% by mass or more. Claim 3 The composition according to claim 1, wherein the dispersant contains at least one dispersant selected from the group consisting of the polyhydroxystearic acid and the polyglyceryl-based dispersant. Claim 4 The composition according to claim 1, wherein the polyglyceryl-based dispersant is polyglycerin-modified silicone or a fatty acid polyglyceryl ester having 3 to 8 glycerin units. Claim 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. Claim 6 The composition according to claim 1, wherein the oil component contains a polar oil. Claim 7 The composition according to any one of claims 1 to 6, which is an oil-in-water cosmetic. Claim 8 The composition according to any one of claims 1 to 6, which is a water-in-oil cosmetic. Claim 9 The composition according to any one of claims 1 to 6, which is an oily cosmetic. Claim 10 The composition according to any one of claims 1 to 6, which is a sunscreen cosmetic composition.

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