Oil-in-water type sunscreen cosmetic

Abstract

An object of the present invention is to provide an oil-in-water sunscreen cosmetic that, while containing a UV protection agent, has a fresh sensation during use and is stable over time, regardless of whether ethanol or a volatile cyclic silicone oil is used.SOLUTION: The above object is achieved by an oil-in-water sunscreen cosmetic comprising the following components (A) to (D): (A) (acrylate / acryloyldimethyltaurate) (C) a water-soluble thickener, and (D) a UV protection agent, wherein a content of the ingredient (A) is from 0.5% by mass to 1.0% by mass, and a ratio of a content of the ingredient (C) to a content of the ingredient (A) [ingredient (C) / ingredient (A)] is 0.4 or less, and the total content of the components (A) to (C) is 1.0% by mass to 2.0% by mass.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water sunscreen cosmetic. [Background technology]

[0002] As sunscreen cosmetics, oil-in-water emulsions tend to be preferred from the viewpoints of convenience, such as a light and refreshing feel when used and the ability to wash off with soap without the need for cleansing agents.

[0003] In such oil-in-water sunscreen cosmetics, the balance between the aqueous phase and the oil phase is adjusted to provide a fresh feeling when used. That is, if the proportion of the oil phase, which is the internal phase, is high, the viscosity of the cosmetic increases and the oily feeling becomes stronger, thereby impairing the fresh feeling. Therefore, in order to achieve a fresh feeling when used, oil-in-water sunscreen cosmetics are prepared by lowering the proportion of the oil phase and relatively increasing the proportion of the aqueous phase.

[0004] However, while oil-in-water sunscreen cosmetics use UV protection agents such as UV absorbers and UV scattering agents as components that exert UV protection functions, it is preferable to use most UV absorbers as oil-phase components from the standpoints of solubility and skin irritation, and UV scattering agents from the standpoint of usability, such as a squeaky feeling. Therefore, in order to achieve excellent UV protection, the proportion of UV protection agents in oil-in-water sunscreen cosmetics must be high, resulting in a high proportion of the oil phase. Known examples of such oil-in-water sunscreen cosmetics include an oil-in-water sunscreen cosmetic that contains, in addition to the UV protection agent, 2.30% of (sodium acrylate / sodium acryloyldimethyltaurate) copolymer / isohexadecane / polysorbate 80 / water, 2.00% of a polyoxyalkylene glyceryl ether such as PEG / PPG / polybutylene glycol-8 / 5 / 3 glycerin, and 1.50% of a water-soluble thickener such as aluminum / magnesium silicate, agar, and xanthan gum (see, for example, Patent Document 1).

[0005] On the other hand, ethanol is used to impart a fresh feeling to oil-in-water sunscreen cosmetics despite the high proportion of oil phase components, but ethanol causes problems such as a dry feeling and a distinctive alcohol odor to oil-in-water sunscreen cosmetics.

[0006] Known examples of oil-in-water sunscreen cosmetics that have a fresh feel when used and are stable over time even without containing ethanol include an oil-in-water sunscreen cosmetic that contains, together with a UV protection agent, 15% cyclopentasiloxane, 1.0% sodium acrylate-sodium acryloyldimethyltaurate copolymer / isohexadecane / polysorbate 80, 2.0% of a higher alcohol such as cetanol, stearyl alcohol, or behenyl alcohol, and 0.15% of a water-soluble thickener such as xanthan gum or hydroxypropyl methylcellulose stearoxy ether (see, for example, Patent Document 2); and a sunscreen cosmetic that contains, together with a UV protection agent, 0.488% (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, 0.5% cetanol, and 1.20% of a water-soluble thickener such as xanthan gum or stearoxyhydroxypropyl methylcellulose (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 7260215 [Patent Document 2] Patent No. 7504642 [Patent Document 3] Patent No. 6616994 Summary of the Invention [Problem to be solved by the invention]

[0008] When the proportion of the oil phase in an oil-in-water emulsion cosmetic is high, a large amount of the internal phase (oil phase) is contained within a small amount of the external phase (aqueous phase), which tends to reduce stability. On the other hand, when the proportion of the oil phase is low, the viscosity decreases, which makes the emulsion particles more likely to flow and coalesce, and the coalesced particles separate over time. Therefore, as a means of solving the above problem, increasing the viscosity of the formulation while reducing the proportion of the oil phase has been studied.

[0009] The oil-in-water UV protective cosmetic composition described in Patent Document 1 contains a relatively large amount of a water-soluble thickener, which is a thickening component, and can achieve a relatively high viscosity. However, according to the inventors' investigations, oil-in-water cosmetic compositions with a high content of water-soluble thickener have the problem of not being sufficiently moisturizing.

[0010] The oil-in-water sunscreen cosmetic described in Patent Document 2, like Patent Document 1, contains a water-soluble thickener and a high solid oil content to achieve a relatively high viscosity, but also contains a large amount of cyclopentasiloxane, a volatile cyclic silicone oil component with high spreadability and low viscosity as a liquid oil, to create a fresh feel when used. However, cyclopentasiloxane imparts a drying feeling to oil-in-water sunscreen cosmetics, and so, like ethanol, there is a limit to the amount that can be used.

[0011] The sunscreen cosmetic described in Patent Document 3, like the oil-in-water UV protective cosmetic described in Patent Document 1, contains a relatively large amount of a water-soluble thickener, and therefore has the problem of not being sufficiently refreshing.

[0012] Therefore, an object of the present invention is to provide an oil-in-water sunscreen cosmetic that contains an ultraviolet protection agent, yet has a fresh feel when used and good stability over time, regardless of whether ethanol or a volatile cyclic silicone oil is used. [Means for solving the problem]

[0013] As a result of extensive research into solving the above-mentioned problems, the present inventors have succeeded in obtaining an oil-in-water sunscreen cosmetic that contains an (acrylate / acryloyldimethyltaurate) copolymer, a higher alcohol, and a water-soluble thickener in addition to a UV protection agent, and that has a fresh feel when used and good stability over time, regardless of whether ethanol and a volatile cyclic silicone oil are used, by further adjusting the content of the (acrylate / acryloyldimethyltaurate) copolymer, the ratio of the water-soluble thickener to the (acrylate / acryloyldimethyltaurate) copolymer, and the total content of the above three components within predetermined ranges.

[0014] Surprisingly, the oil-in-water sunscreen cosmetic composition described above can contain a relatively small amount of water-soluble thickener, reducing stickiness. Nevertheless, the composition is easy to use and does not drip.

[0015] Furthermore, the oil-in-water sunscreen cosmetic composition can be produced very easily by adding an (acrylate / acryloyldimethyltaurate) copolymer to an oil phase and then adding an aqueous phase to the resulting mixture. It is also possible to reverse the order of the oil and aqueous phases, making it highly versatile in terms of production.

[0016] Based on these successes and findings, the present inventors have succeeded in creating an oil-in-water sunscreen cosmetic that solves the problems of the present invention and contains an (acrylate / acryloyldimethyltaurate) copolymer, a higher alcohol, and a water-soluble thickener, along with an UV protection agent. The present invention was completed based on the successes and findings first achieved and discovered by the present inventors.

[0017] Therefore, as one aspect of the present invention, the following cosmetic compositions are provided. [1] An oil-in-water sunscreen cosmetic, The following ingredients (A) to (D) (A) (Acrylate / Acryloyldimethyltaurate) Copolymer (B) Higher alcohol (C) Water-soluble thickener (D) UV protection agent Including, The content of the component (A) is 0.5% by mass to 1.0% by mass, the ratio of the content of the component (C) to the content of the component (A) [component (C) / component (A)] is 0.4 or less; and The cosmetic preparation as described above, wherein the total content of the components (A) to (C) is 1.0% by mass to 2.0% by mass. [2] The cosmetic preparation according to item [1], wherein the ratio of the content of component (B) to the content of component (A) [component (B) / component (A)] is 2.0 or less. [3] The cosmetic preparation according to item [1], further comprising substantially no (E) ethanol or volatile cyclic silicone oil. [4] The cosmetic preparation according to any one of items [1] to [3], wherein the content of the component (B) is 0.1% by mass to 1.4% by mass. [5] The cosmetic preparation according to any one of items [1] to [3], wherein the content of the component (C) is 0.05% by mass to 0.35% by mass. [6] The cosmetic preparation according to any one of items [1] to [3], wherein the component (B) is at least one higher alcohol selected from the group consisting of higher alcohols having 12 to 22 carbon atoms. [7] The cosmetic preparation according to any one of items [1] to [3], wherein the component (C) is at least one water-soluble thickener selected from the group consisting of microbial thickeners, seaweed-based thickeners, cellulose-based thickeners, amino acid-based thickeners, polyethylene glycol-based thickeners, inorganic water-soluble polymers, and starch-based thickeners. [8] The cosmetic preparation according to any one of items [1] to [3], wherein the component (D) is an ultraviolet protection agent containing effective amounts of both an ultraviolet absorber and an ultraviolet scattering agent. [Effects of the Invention]

[0018] According to the present invention, it is possible to obtain a sunscreen cosmetic that has a refreshing feel when used and has good stability over time while still having UV protection due to the UV protection agent contained therein. Furthermore, according to the present invention, the content of the UV protection agent, which contains both an UV absorber and a scattering agent, can be set to a relatively large amount, making it possible to provide a sunscreen cosmetic that has excellent UV protection.

[0019] The oil-in-water sunscreen cosmetic of one embodiment of the present invention can be set to contain a low amount of water-soluble thickener, so it feels fresh, but does not drip, and is easy to use.Furthermore, it can be applied to the desired area in the desired amount with a fresh feel, so it is expected to be used comfortably on a daily basis.In addition, the oil-in-water sunscreen cosmetic of one embodiment of the present invention has excellent stability, so it can be used and stored for long periods of time.Furthermore, the oil-in-water sunscreen cosmetic of one embodiment of the present invention can be produced simply and on an industrial scale. DETAILED DESCRIPTION OF THE INVENTION

[0020] The present invention will be described in detail below, but the present invention can take various forms as long as it achieves its object.

[0021] Unless otherwise specified, each term in this specification is used in the sense commonly used by those skilled in the cosmetic field and should not be construed as having an unduly restrictive meaning. Furthermore, the theories and speculations made in this specification are based on the inventors' knowledge and experience to date, and therefore the technical scope of the present invention is not limited solely by such theories and speculations.

[0022] "Content" is synonymous with concentration and amount added (amount used), and unless otherwise specified, refers to the ratio of the amount of a component to the total amount of the oil-in-water emulsion cosmetic. However, the total amount of each component does not exceed 100%. In this specification, unless otherwise specified, the unit of content is "% by mass (wt%)." When a commercially available product is used, the content of the component is preferably the amount of the component contained in the commercially available product, but it may also be the amount of the commercially available product itself. "And / or" means any one or any or all combinations of two or more of the associated listed items. "Comprising" means that elements other than those explicitly stated as being included can be added (same meaning as "comprising at least"), but also encompasses "consisting of" and "consisting essentially of." That is, "comprising" can mean including the explicitly stated elements and any one or more elements, consisting of the explicitly stated elements, or consisting essentially of the explicitly stated elements. Elements include limitations such as ingredients, steps, conditions, and parameters. The "to" in a numerical range means a range that includes both the preceding and following numerical values, and also includes a range excluding one of the included limit values. For example, "0% by mass to 100% by mass" may mean 0% by mass or more, 100% by mass or less, or 0% by mass or more and 100% by mass or less. The term "about" in relation to a numerical value means a range of ±10% of the stated numerical value. For example, about 5% by mass would be 4.5% to 5.5% by mass. The number of digits in an integer value matches the number of significant digits. For example, 1 has one significant digit, and 10 has two significant digits. Also, the number of digits after the decimal point in a decimal value matches the number of significant digits. For example, 0.1 has one significant digit, and 0.10 has two significant digits.

[0023] An oil-in-water sunscreen cosmetic according to one embodiment of the present invention comprises an (acrylate / acryloyldimethyltaurate) copolymer (hereinafter also referred to as component (A)), a higher alcohol (hereinafter also referred to as component (B)), a water-soluble thickener (hereinafter also referred to as component (C)), and an ultraviolet protection agent (hereinafter also referred to as component (D)).

[0024] A "sunscreen cosmetic" is a cosmetic that is composed of a combination of multiple ingredients and is applied to the skin to reduce or prevent sunburn. The ingredients are used to produce the sunscreen cosmetic, and may exist in the sunscreen cosmetic after production, either maintaining their original structure or in a structurally altered state, such as ionized. The specific examples of ingredients listed in this specification are illustrative only, and are not intended to be limiting as long as they fit the definition of an ingredient. The ingredients may be either those obtained by known methods or commercially available ingredients.

[0025] [Component (A): (Acrylate / Acryloyldimethyltaurate) Copolymer] The (acrylate / acryloyldimethyltaurate) copolymer of component (A) is a copolymer of acrylate and acryloyldimethyltaurate, containing acrylate and acryloyldimethyltaurate as structural units. The salt forms of component (A) may be the same or different, but are preferably the same, and both are preferably sodium (Na). Therefore, component (A) is preferably a (sodium acrylate / sodium acryloyldimethyltaurate) copolymer.

[0026] Component (A) primarily functions as an emulsifier. Component (A) can also impart a fresh, non-sticky feel and a consistent viscosity to oil-in-water sunscreen cosmetics. Component (A) may be synthesized or extracted by known methods, or may be commercially available. An example of a commercially available product of component (A) is "SIMULGEL EG QD" (manufactured by SEPPIC). SIMULGEL EG QD contains (sodium acrylate / sodium acryloyldimethyl taurate) copolymer, isohexadecane, and polysorbate 80, of which the content of (sodium acrylate / sodium acryloyldimethyl taurate) copolymer is 37.5% by mass. Component (A) may be one of these alone or a combination of two or more.

[0027] The content of component (A) may be an amount that can exert an emulsifying effect in the oil-in-water sunscreen cosmetic, but if it is too low, it will not exert a sufficient emulsifying effect, and if it is too high, the freshness and feel of the oil-in-water sunscreen cosmetic will be impaired and the oil-in-water sunscreen cosmetic will tend to gel over time, reducing its stability. Therefore, the content of component (A) is 0.5% to 1.0% by mass, and in order to improve the feel of the oil-in-water sunscreen cosmetic and the emulsion stability, it is preferably 0.5% to 0.95% by mass, and more preferably 0.7% to 0.8% by mass.

[0028] By including components (B) and (C) in addition to component (A), the oil-in-water sunscreen cosmetic composition can achieve the desired viscosity, be fresh and moist, have good stability over time, and have a non-sticky feel and non-dripping application.If components (B) and (C) are not included, after the oil-in-water sunscreen cosmetic composition is applied to the skin and dried, the polymer aggregates on the skin, causing product residue (crumbs).

[0029] [Component (B): Higher alcohol] The higher alcohol of component (B) is a monohydric alcohol having six or more carbon atoms. Component (B), together with components (A) and (C), functions to impart a fresh feel to the oil-in-water sunscreen cosmetic and good stability over time. Component (B) also imparts viscosity to the oil-in-water sunscreen cosmetic, preventing dripping and improving usability, and can also improve emulsifiability during production.

[0030] Examples of component (B) include lauryl alcohol, myristyl alcohol, cetanol (cetyl alcohol), cetostearyl alcohol, stearyl alcohol, arachyl alcohol, behenyl alcohol, and hexyldecanol. From the viewpoints of providing a thick feel upon application, thereby improving moisture and freshness, and imparting appropriate hardness and improving stability, component (B) is preferably solid at room temperature (20°C) and atmospheric pressure (760 mmHg), and is more preferably a linear saturated higher alcohol. Furthermore, those having 12 to 24 carbon atoms are preferred, and those having 16 to 22 carbon atoms are more preferred. From the viewpoint of their proven track record as raw materials for cosmetics, cetanol, cetostearyl alcohol, stearyl alcohol, and behenyl alcohol are even more preferred, and cetanol is even more preferred. Component (B) may be one of these alone or a combination of two or more.

[0031] The content of component (B) may be any amount that, when blended with components (A) and (C), can impart a fresh feel to the oil-in-water sunscreen cosmetic and good stability over time. However, if the content of component (B) is excessive, the freshness of the oil-in-water sunscreen cosmetic may decrease and stickiness may increase. Therefore, the content of component (B) is, for example, preferably 0.1% to 1.4% by mass, more preferably 0.3% to 1.1% by mass, and even more preferably 0.5% to 1.0% by mass.

[0032] If the amount of component (B) is excessive relative to the amount of component (A), non-stickiness tends to be impaired, so the content of component (B) is preferably about the same as the content of component (A). From this perspective, the ratio of the content of component (B) to the content of component (A) [component (B) / component (A)] is, for example, preferably 2.0 or less, more preferably 0.1 to 2.0, even more preferably 0.2 to 1.9, still more preferably 0.3 to 1.8, and particularly preferably 0.6 to 1.5.

[0033] [Component (C): Water-soluble thickener] The water-soluble thickener of component (C) is a component that dissolves in water and increases the viscosity of the aqueous solution. Component (C), together with components (A) and (B), functions to impart a fresh feel to the oil-in-water sunscreen cosmetic and good stability over time. Component (C) also imparts viscosity to the oil-in-water sunscreen cosmetic, reducing stickiness and sliminess upon drying and improving adhesion to the skin.

[0034] Component (C) may be, for example, a microbial thickener such as xanthan gum, hydroxypropyl xanthan gum, dextran, sclerotium gum, or gellan gum; a seaweed-based thickener such as carrageenan, alginate, propylene glycol alginate, agar, or fucoidan; a cellulose-based thickener such as methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxymethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, carboxymethylcellulose, carboxyethylcellulose, or stearoxyhydroxypropylmethylcellulose; or a collagen-based thickener. Examples of suitable thickeners include amino acid-based thickeners; polyethylene glycol-based thickeners such as polyethylene glycol and polyethylene glycol distearate; urethane-based thickeners such as PEG-240 / decyl tetradeceth-20 / HDI copolymer and polyurethane-59; inorganic water-soluble polymers such as aluminum / magnesium silicate; starch-based thickeners such as hydroxypropyl starch phosphate and corn starch; and acrylic acid-based thickeners such as carboxyvinyl polymers and acrylates / C10-30 alkyl acrylate crosspolymers (excluding acrylate / acryloyldimethyltaurate copolymers). Component (C) is a thickening component with a proven track record as a cosmetic ingredient. Xanthan gum, dextran, tamarind gum, gellan gum, and hydroxyethyl cellulose are preferred, with xanthan gum being more preferred, due to their ability to impart appropriate viscosity and stability. Component (C) may be one of these alone or a combination of two or more.

[0035] The content of component (C) may be any amount that can impart a fresh feel to the oil-in-water sunscreen cosmetic and good stability over time when blended with components (A) and (B). However, if the content of component (C) is excessive, the freshness of the oil-in-water sunscreen cosmetic may decrease, stickiness may increase, and stringiness may occur. Therefore, the content of component (C) is, for example, preferably 0.05% to 0.35% by mass, more preferably 0.08% to 0.3% by mass.

[0036] If the amount of component (C) is excessive relative to the amount of component (A), the freshness tends to be lost. Therefore, the content of component (C) is smaller than the content of component (A). Specifically, the ratio of the content of component (C) to the content of component (A) [component (C) / component (A)] is 0.4 or less, preferably 0.05 to 0.4, and more preferably 0.05 to 0.3.

[0037] An oil-in-water sunscreen cosmetic can have excellent stability over time by containing component (A) in an appropriate amount to provide a fresh, non-sticky feel when used, while also containing components (B) and (C) in specified amounts. Therefore, the total content of components (A), (B), and (C) is 1.0% to 2.0% by mass. To improve the feel when used and emulsion stability of the oil-in-water sunscreen cosmetic, it is preferably 1.2% to 2.0% by mass, and more preferably 1.3% to 2.0% by mass. If the total content of components (A), (B), and (C) is excessive, stickiness may increase. If the total content of these three components is too low, viscosity may decrease, causing dripping. Furthermore, stability may also decrease.

[0038] [Component (D): UV protection agent] Component (D) is a UV protection agent that protects the skin from ultraviolet (UV) rays and reduces the effects of UV rays on the skin. UV protection agents are broadly classified into UV absorbers and UV scattering agents.

[0039] UV absorbers are components that absorb light in the UV wavelength range, and can convert UV to light of a different wavelength by absorbing UV or temporarily change their own molecular structure. UV refers to the electromagnetic waves contained in sunlight with wavelengths in the 100-400 nm range. Generally, light with a wavelength of 320-400 nm is called UV-A, and light with a wavelength of 290-320 nm is called UV-B. The UV absorbers contained in oil-in-water sunscreen cosmetics can be UV absorbers for UV-A (UV-A absorbers), UV absorbers for UV-B (UV-B absorbers), or a combination thereof. However, to absorb UV rays over a wide wavelength range, a combination of UV-A absorbers and UV-B absorbers is preferred. While either oil-soluble or water-soluble UV absorbers can be used, they are preferably incorporated into the internal phase (oil phase) from the standpoint of skin irritation. Therefore, oil-soluble UV absorbers are preferred.

[0040] Examples of UV-A absorbers include diethylaminohydroxybenzoyl hexyl benzoate, 2-hydroxy-4-methoxybenzophenone, bisethylhexyloxyphenol methoxyphenyl triazine, 2-(2-hydroxy-5-methylphenyl)benzotriazole, dimethoxybenzylidene dioxoimidazolidine 2-ethylhexyl propionate, bis(resulcinyl)triazine, methylenebisbenzotriazolyl tetramethylbutylphenol, t-butylmethoxydibenzoylmethane, etc., and these can be used alone or in combination of two or more.As UV-A absorbers, those that can exhibit high UV-A absorbing effect even in small amounts are preferred, and diethylaminohydroxybenzoyl hexyl benzoate is more preferred.

[0041] Examples of UV-B absorbers include ethylhexyl methoxycinnamate (2-ethylhexyl paramethoxycinnamate), bisethylhexyloxyphenol methoxyphenyl triazine, 2-ethylhexyl 2-cyano-3,3-diphenylacrylate, dimethicone diethyl benzalmalonate, 2,4,6-trianilino-p-(carbo-2'-ethylhexyl-1'-oxy)-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, homomenthyl salicylate, and octyl salicylate. These may be used alone or in combination of two or more. As UV-B absorbers, those that can exhibit high UV-B absorption activity even in small amounts are preferred, and ethylhexyl methoxycinnamate is more preferred.

[0042] When a UV-A absorber and a UV-B absorber are used in combination as ultraviolet absorbers, diethylaminohydroxybenzoylhexyl benzoate and ethylhexyl methoxycinnamate are preferred, respectively, from the viewpoints of compatibility and providing good ultraviolet protection effects.

[0043] The content of the UV absorber may be any amount that provides a UV absorbing effect, and for example, in order for the oil-in-water sunscreen cosmetic to exhibit good UV protection effect, it is preferably 0.1% to 25% by mass, more preferably 1% to 20% by mass, even more preferably 5% to 15% by mass, and even more preferably 6% to 10% by mass. If the content of the UV absorber exceeds 25% by mass, the resulting oil-in-water sunscreen cosmetic may have an oily feel and stickiness (particularly when a solid UV absorber is used), and may be more irritating and less safe.

[0044] UV scattering agents are components capable of scattering or reflecting UV light. They are not particularly limited as long as they are commonly used as UV scattering agents in cosmetics, and the shape, hydrophobic surface treatment method, type of metal oxide, shape and particle size of the fine particles, etc., can be selected appropriately. Examples of UV scattering agents include fine particle metal oxides such as zinc oxide, titanium oxide, and cerium oxide, which are spherical, rod-like, needle-like, spindle-like, plate-like, or irregular in shape and have a volume average particle size of the nano-order (e.g., about 10 nm to 100 nm). The UV scattering agent may be one of these alone or a combination of two or more.

[0045] The fine metal oxide particles used as UV scattering agents are preferably surface-treated to reduce their photocatalytic activity and minimize their impact on the skin to which they are applied. Examples of surface treatments for fine metal oxide particles include silica treatment with hydrated silica or silica; silicone treatment with methylhydrogenpolysiloxane, methylhydrogenpolysiloxane-dimethylpolysiloxane copolymer, dimethylpolysiloxane, methylpolysiloxane, etc.; aluminum treatment with aluminum hydroxide or aluminum oxide, etc.; silane treatment with triethoxycaprylylsilane, octyltriethoxysilane, hexyltrimethoxysilane, etc.; fatty acid treatment with palmitic acid, stearic acid, isostearic acid, etc.; metal soap treatment with alkali metal salts or alkaline earth metal salts of fatty acids, etc.; fluorine treatment with perfluoroalkyl phosphate esters, perfluoroalkyl phosphate diethanolamine salts, perfluoroalkyltrimethoxysilane, etc.; amino acid treatment with N-acylglutamic acid, etc.; lecithin treatment, alkyl phosphate ester treatment, etc. Here, the fine particle metal oxide to be incorporated into the oil-in-water emulsion is preferably incorporated into the internal phase (oil phase) because incorporating it into the external phase (aqueous phase) tends to cause a feeling of squeakiness and deteriorates the feel when used. Therefore, among the above surface treatments, those that can impart lipophilicity (hydrophobicity) are preferred. In view of their ability to impart lipophilicity and the fact that surface treatment of fine particle metal oxides has a long track record in the cosmetics field, silicone treatment and / or aluminum treatment are preferred, and a combination of these treatments is even more preferred.

[0046] The content of the UV scattering agent may be any amount that provides a light scattering or light reflecting effect, and for example, in order for the oil-in-water sunscreen cosmetic to exhibit good UV protection effect, it is preferably 0.1% to 30% by mass, more preferably 0.5% to 20% by mass, and even more preferably 1% to 15% by mass. If the content of the UV scattering agent exceeds 30% by mass, the resulting oil-in-water sunscreen cosmetic may have a strong squeaky feeling upon application and may also have a strong white cast.

[0047] The UV protection agent may be one or more UV absorbers and / or one or more UV scattering agents, but in order for the oil-in-water sunscreen cosmetic to achieve good UV protection effects, the UV protection agent is preferably a combination of one or more UV absorbers and one or more UV scattering agents. When the UV protection agent is a combination of a UV absorber and a UV scattering agent, it is possible to impart a high UV protection effect to the oil-in-water sunscreen cosmetic within the limited blending ratio of the internal phase (oil phase) without bringing about the negative effects associated with blending high amounts of UV scattering agents and UV absorbers alone.

[0048] The respective contents of the ultraviolet absorber and ultraviolet scattering agent are as described above, but the total content of the ultraviolet absorber and ultraviolet scattering agent as an ultraviolet protection agent is, for example, preferably 0.5% to 40% by mass, more preferably 1% to 30% by mass, and even more preferably 5% to 25% by mass, in order for the oil-in-water sunscreen cosmetic to exhibit good ultraviolet protection effect.

[0049] [Ingredient (E): Non-containing ingredient] Ethanol can reduce the viscosity of oil-in-water sunscreen cosmetics and provide a fresh feel when used. The ethanol content that provides this effect is 1% by mass or more. However, this amount of ethanol can cause dryness and irritation after application to oil-in-water sunscreen cosmetics. Examples of volatile cyclic silicone oils include cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane. Like ethanol, when the content is 1% by mass or more, volatile cyclic silicone oils can reduce the viscosity and provide a fresh feel when used, but they also cause dryness and irritation after application.

[0050] Therefore, it is preferable that the oil-in-water sunscreen cosmetic is substantially free of ethanol and volatile cyclic silicone oil. "Substantially free" of ethanol, etc. means that ethanol, etc. is not intentionally included, except in cases where ethanol, etc. is inevitably mixed in due to raw materials containing ethanol, etc., together with components other than ethanol, etc., or due to the manufacturing process, etc. Therefore, "substantially free" means that ethanol, etc. is completely absent, or if present, only in trace amounts, and the total content of ethanol and volatile cyclic silicone oil is 0% to 1% by mass, preferably 0% to 0.5% by mass, and more preferably 0% to 0.1% by mass.

[0051] [Other ingredients] The oil-in-water sunscreen cosmetic composition of one embodiment of the present invention may contain other components in addition to component (A), component (B), component (C), and component (D), as long as the object of the present invention can be achieved.

[0052] Examples of other components include components typically used in cosmetics, such as bases, oils, hydrophilic emulsifiers, lipophilic emulsifiers, emulsifier aids, moisturizers, preservatives, pH adjusters, antioxidants, cooling agents, chelating agents, whitening agents, vitamins, cosmetic ingredients, medicinal ingredients, fragrances, coloring pigments, and coloring materials such as pearlescent agents. The content of other components can be appropriately determined by those skilled in the art as long as it does not interfere with the solution of the problems of the present invention. Some of the other components are listed below, but these are merely examples and are not limiting.

[0053] The base is typically water. Water is used as the base for the aqueous phase. The water may be any water normally used to prepare cosmetics, such as purified water or tap water. The water content may be an amount sufficient to form an oil-in-water cosmetic, and is, for example, preferably 50% to 85% by mass, more preferably 55% to 80% by mass, and even more preferably 59% to 75% by mass. The content of the aqueous phase containing water is preferably 70% to 80% by mass.

[0054] Examples of oily agents include oil-based emollient components, such as triethylhexanoin, isononyl isononanoate, isotridecyl isononanoate, diisostearyl malate, ethylhexyl palmitate, cetyl ethylhexanoate, dipentaerythrityl hexahydroxystearate, pentaerythrityl tetraisostearate, dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate, dimethicone, methylphenylpolysiloxane, diphenylsiloxyphenyl trimethicone, squalane, mineral oil, hydrogenated poly(C6-12 olefin), polyglyceryl-2 triisostearate, olive fruit oil, jojoba seed oil, lavender oil, evening primrose oil, avocado oil, camellia seed oil, and macadamia seed oil. These may be used alone or in combination. The content of the oily agent is preferably 1% to 10% by mass. The content of the oil phase containing the oil agent is preferably 20% by mass to 30% by mass.

[0055] The hydrophilic emulsifier is a water-soluble emulsifier that is solubilized in water, and examples thereof include emulsifiers having a hydrophilic-lipophilic balance (HLB) of preferably 7 or more, more preferably an emulsifier having an HLB of 10 to 18, and even more preferably an emulsifier having an HLB of 12 to 16. Examples of emulsifiers having an HLB of 12 to 16 include polyglycerin fatty acid esters such as polyglyceryl-6 laurate, polyglyceryl-10 myristate, polyglyceryl-10 stearate, and polyglyceryl-10 isostearate; polyoxyethylene glycerin fatty acid esters such as PEG-15 glyceryl stearate and PEG-15 glyceryl isostearate; polysorbate 40, polysorbate 60, polysorbate 80, and PEG-20 sorbitan isostearate; Examples of suitable hydrophilic emulsifiers include oxyethylene sorbitan fatty acid esters; polyoxyethylene sorbitan fatty acid esters such as sorbeth-6 laurate, sorbeth-40 tetraoleate, and sorbeth-60 tetraoleate; polyoxyethylene hydrogenated castor oils such as PEG-50 hydrogenated castor oil and PEG-60 hydrogenated castor oil; polyethylene glycol fatty acid esters such as PEG-10 laurate, PEG-10 stearate, and PEG-25 stearate; and lecithin derivatives such as hydrogenated lecithin and hydrogenated lysolecithin. The hydrophilic emulsifier may be one of these alone or a combination of two or more. The use of a hydrophilic emulsifier, preferably polysorbate 60, allows for stable emulsification of oil-in-water sunscreen cosmetics. The content of the hydrophilic emulsifier is preferably 0.2% to 5.0% by mass, for example, to promote emulsification of the oil-in-water sunscreen cosmetics.

[0056] The lipophilic emulsifier may be any emulsifier that is relatively poorly soluble in water, and for example, preferably an emulsifier having an HLB of less than 7, more preferably an emulsifier having an HLB of 1 to 6, and even more preferably an emulsifier having an HLB of 3 to 6. Examples of emulsifiers having an HLB of 3 to 6 include sorbitan stearate, sorbitan isostearate, sorbitan sesquiisostearate, sorbitan monooleate, sorbitan sesquioleate, glyceryl stearate, glyceryl stearate (SE), polyglyceryl-2 triisostearate, polyglyceryl-2 diisostearate, polyglyceryl-2 distearate, polyglyceryl-2 oleate, and PEG-3 glyceryl isostearate. The lipophilic emulsifier may be one of these alone or a combination of two or more. The content of the lipophilic emulsifier is preferably 0.5% by mass to 3% by mass, for example, in order to promote emulsification of the oil-in-water sunscreen cosmetic.

[0057] Examples of moisturizing agents include glycerin, concentrated glycerin, butylene glycol (BG), propylene glycol (PG), diglycerin, dipropylene glycol (DPG), pentylene glycol, 1,2-hexanediol, heptanediol, ethylhexylglycerin, methyl gluceth-10, methyl gluceth-20, PEG / PPG / polybutylene glycol-8 / 5 / 3 glycerin, polyethylene glycol, polyquaternium-51, trehalose, xylitol, maltitol, maltose, sorbitol, erythritol, raffinose, glucose, fructose, hydrolyzed elastin, sodium lactate, cyclodextrin, pyrrolidone carboxylic acid, hyaluronic acid, sodium hyaluronate, acetylated hyaluronic acid, sodium acetylated hyaluronate, and sodium chondroitin sulfate. These may be used alone or in combination. The content of the moisturizing agent is preferably 0% to 20% by mass.

[0058] Examples of preservatives include phenoxyethanol, methylparaben, propylparaben, benzoic acid, salicylic acid, carbolic acid, sorbic acid, parachlormetacresol, hexachlorophene, benzalkonium chloride, chlorhexidine chloride, trichlorocarbanilide, and photosensitizers, which can be used alone or in combination of two or more. The content of the preservative is preferably 0% by mass to 2% by mass.

[0059] Examples of chelating agents include alanine, disodium edetate, tetrasodium edetate, pentasodium diethylenetriaminepentaacetate, sodium polyphosphate, sodium metaphosphate, sodium phytate, trisodium phosphate, etc. These can be used alone or in combination of two or more. The content of the chelating agent is preferably about 0% by mass to 0.5% by mass.

[0060] Examples of antioxidants include vitamin E and its derivatives such as dibutylhydroxytoluene, butylhydroxyanisole, and δ-tocopherol; thiotaurine, evening primrose extract, β-carotene, catechin compounds, flavonoid compounds, polyphenol compounds, and sodium pyrosulfite, and these can be used alone or in combination of two or more. The content of the antioxidant is preferably 0% by mass to 1% by mass.

[0061] Examples of pH adjusters include lactic acid, citric acid, sodium citrate, glycolic acid, succinic acid, tartaric acid, malic acid, sodium malate, etidronic acid, potassium carbonate, sodium bicarbonate, ammonium bicarbonate, sodium hydroxide, potassium hydroxide, arginine, triethanolamine, and monoethanolamine, and these can be used alone or in combination of two or more. The content of the pH adjuster is preferably 0% by mass to 1% by mass. The pH adjuster is also called a neutralizing agent.

[0062] Examples of cosmetic ingredients include apple tannin, licorice root extract, resveratrol, isomerized sugar, Morinda citriodora juice, Citrus fruit extract, dipotassium glycyrrhizinate, stearyl glycyrrhetinate, tranexamic acid, etc., and these can be used alone or in combination of two or more. The content of the cosmetic ingredient is preferably 0% to 5% by mass.

[0063] Examples of coloring materials include metal oxides such as titanium oxide, zinc oxide, iron oxide, red iron oxide, yellow iron oxide, red iron oxide, black iron oxide, Prussian blue, ultramarine, chromium oxide, and chromium hydroxide; metal complexes such as manganese violet and cobalt titanate; inorganic pigments such as carbon black; Red No. 3, Red No. 104, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 227, Examples of pigments include synthetic organic pigments such as Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Orange No. 203, Orange No. 204, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 401, Blue No. 1, and Blue No. 404; natural organic pigments such as β-carotene, caramel, and paprika pigment; and pearl pigments in which base particles such as mica are coated with titanium dioxide. These pigments can be used alone or in combination. The content of the colorant is preferably 0% to 5% by mass. When a colorant is used, it is preferable to use an oil such as polyhydroxystearic acid, polyglyceryl-2 triisostearate, diisostearyl malate, or triethylhexanoin as a pigment dispersant.

[0064] [Oil-in-water sunscreen cosmetics] The oil-in-water sunscreen cosmetic of one embodiment of the present invention is used by applying it to the skin in the same way as ordinary sunscreen cosmetics to reduce or prevent sunburn. The oil-in-water sunscreen cosmetic of one embodiment of the present invention contains, in addition to component (D) an ultraviolet protection agent, component (A) an (acrylate / acryloyldimethyltaurate) copolymer, component (B) a higher alcohol, and component (C) a water-soluble thickener in specified amounts and ratios, thereby providing a fresh feel when used and good stability over time.

[0065] The fresh feeling in use of the oil-in-water sunscreen cosmetic of one embodiment of the present invention may be such that it is more easily perceived as fresh than a cosmetic that does not contain components (A) to (D), or does not contain them in the specified amounts and proportions, and for example, is such that it is not rated as "×", more preferably as "◎" or "○", and even more preferably as "◎", by the method described in the examples below.

[0066] The temporal stability of the oil-in-water sunscreen cosmetic of one embodiment of the present invention may be such that it is stable over time compared to a cosmetic that does not contain components (A) to (D), or does not contain them in the specified amounts and proportions, and for example, is such that it is not rated as "×", and more preferably is rated as "○", by the method described in the Examples below.

[0067] The oil-in-water sunscreen cosmetic according to one embodiment of the present invention can further have a non-sticky feel and drip-free application.

[0068] The non-sticky feel of the oil-in-water sunscreen cosmetic of one embodiment of the present invention may be such that it feels less sticky than a cosmetic that does not contain components (A) to (D), or does not contain them in the specified amounts and proportions, and for example, is such that it is not rated as "X", more preferably as "◎" or "○", and even more preferably as "◎", by the method described in the Examples below.

[0069] The drip-free usability of the oil-in-water sunscreen cosmetic of one embodiment of the present invention may be such that dripping is less likely to be observed compared to a cosmetic that does not contain components (A) to (D), or does not contain them in the specified amounts and proportions, and for example, such that it is not rated as "×", more preferably as "◎" or "○", and even more preferably as "◎", by the method described in the examples below.

[0070] The oil-in-water sunscreen cosmetic of one embodiment of the present invention is not particularly limited in appearance or other properties. The oil-in-water sunscreen cosmetic of one embodiment of the present invention preferably has an appearance of a translucent or opaque milky white to white emulsion, more preferably colored with a coloring material, and even more preferably cream-like; viscosity (20°C) is preferably 20,000 mPa·s to 50,000 mPa·s, more preferably 21,000 mPa·s to 45,000 mPa·s, and even more preferably 22,000 mPa·s to 32,000 mPa·s; pH is preferably 5.8 to 6.8; SPF (Sun Protection Factor) is preferably 40 or higher, more preferably 50+; and PA (Protection Grade of UVA) is preferably PA++ or higher, more preferably PA++++.

[0071] The oil-in-water sunscreen cosmetic of one embodiment of the present invention can be obtained by mixing components (A) to (D) and, optionally, other components, and emulsifying the mixture. For example, component (A) can be added to an oil phase containing components (B) and (D) to obtain a suspension, and then an aqueous phase containing component (C) can be added to the resulting suspension and subjected to an emulsification treatment to obtain the oil-in-water sunscreen cosmetic of one embodiment of the present invention. The oil and aqueous phases may also be reversed. Specifically, the oil-in-water sunscreen cosmetic of one embodiment of the present invention can be prepared by the method described in the Examples below.

[0072] In the manufacturing method of an oil-in-water sunscreen cosmetic, blending an ultraviolet scattering agent in the external phase (aqueous phase) may adversely affect the feel during use, such as a squeaky feeling during application, and from the viewpoint of the solubility of an ultraviolet absorber, it is preferable to blend component (D) in the internal phase (oil phase). Furthermore, a hydrophilic emulsifier such as polysorbate 60 may be a component of either the aqueous phase or the oil phase.

[0073] The oil-in-water sunscreen cosmetic of one embodiment of the present invention is not particularly limited in its mode of use or formulation, and can be used, for example, in skin care cosmetics, body care cosmetics, and base makeup cosmetics, specifically gel creams, creams, emulsions, serums, sunscreen milks, sunscreen creams, sunscreen gels, makeup bases, liquid foundations, cream foundations, BB creams, hand creams, eye creams, neck creams, all-in-one cosmetics, etc. The oil-in-water sunscreen cosmetic of one embodiment of the present invention is preferably in a formulation having a certain viscosity, such as a cream, emulsion, or serum, because it provides a fresh feeling, is stable over time, and also has a non-sticky feel and drip-free application.

[0074] The oil-in-water sunscreen cosmetic of one embodiment of the present invention can reduce or prevent sunburn on the skin when applied to the skin. The method of applying the oil-in-water sunscreen cosmetic of one embodiment of the present invention to the skin is not particularly limited, and examples include methods of applying the oil-in-water sunscreen cosmetic of one embodiment of the present invention to the skin and then spreading it with fingers or an applicator. Furthermore, the oil-in-water sunscreen cosmetic of one embodiment of the present invention can prevent evaporation of water from the skin surface due to the moisturizing effect of the oil. Furthermore, by containing water and a moisturizing agent, the oil-in-water sunscreen cosmetic of one embodiment of the present invention can improve dry skin to which it is applied or prevent further deterioration due to dryness.

[0075] The oil-in-water sunscreen cosmetic of one embodiment of the present invention, when dispensed onto the skin, can remain on the skin without dripping even when the contact area is large. The oil-in-water sunscreen cosmetic of one embodiment of the present invention is preferably in a formulation that gives a refreshing feeling, and is preferably a milky white to white or colored cream.

[0076] The present invention will be explained in more detail below with reference to examples. However, the present invention is not limited to these examples, and the present invention can take various forms as long as the object of the present invention can be achieved. [Example]

[0077] [1. Preparation of test cosmetics] Various oil-in-water emulsion cosmetics were prepared as test cosmetics according to the following procedure, in accordance with the formulations shown in Table 1. The values ​​indicating the content of each component in the table represent mass % (wt%).

[0078] A homogeneous oil phase was prepared by mixing and stirring ingredients 1 to 9 at 80° C. A homogeneous water phase was prepared by mixing and stirring ingredients 11 to 24 at 80° C.

[0079] Component 10 was added to the oil phase, and the mixture was stirred and mixed using a Disper ("Labo-Lution"; manufactured by Primix Corporation) at 80°C at 1,000 rpm for 3 minutes to obtain a suspension. The aqueous phase was added to the resulting suspension, and the mixture was emulsified using a Disper ("Labo-Lution"; manufactured by Primix Corporation) at 80°C at 4,500 rpm for 3 minutes to obtain an emulsified product.

[0080] The resulting emulsified product was cooled to 30°C while being gently stirred with a paddle, to obtain an oil-in-water sunscreen cosmetic as a test cosmetic.

[0081] [2. Evaluation Method] (2-1) Usability: Viscosity The test cosmetic was placed in a Mayonnaise Bottle M-225 (Tokyo Glass Co., Ltd.) and allowed to stand overnight at 20°C. Next, using a BM-type viscometer (VISCOMETER TVB-25L; Toki Sangyo Co., Ltd.), the viscosity (mPa s) was measured 3 minutes after the start of measurement under conditions of Spindle No. M4 and 6 rpm.

[0082] (2-2) Usability: Dripping 0.50g of the test cosmetic was placed on a horizontally placed black acrylic plate, and then the acrylic plate was stood upright at 90 degrees (vertical). After standing upright for 1 minute, the length between the starting point where the test cosmetic was placed and the end point of the dripping tip of the test cosmetic was measured. Based on the measured length, dripping was evaluated according to the following criteria. ○: Length is less than 5.0 cm ×: Length is 5.0 cm or more

[0083] (2-3) Usability Seven panelists trained in the sensory evaluation of cosmetics applied the test cosmetic directly to the skin (upper arm) and rated the "freshness" and "non-stickiness" of the cosmetic on the skin during application, using "Junhadajitsu Daytime Cream" (manufactured by Chifure Cosmetics Co., Ltd.) as a control product, according to the following evaluation criteria. "Freshness" refers to the smooth spread of the cosmetic from the beginning to the middle of application, without any friction or weightiness. "Non-stickiness" refers to the absence of any sticky or tacky feeling that makes the cosmetic stick to the skin or fingers when it dries in the latter half of application. [Evaluation criteria] 3 points: Better than the control 2 points: Same as the control product 1 point: Inferior to the control

[0084] Furthermore, based on the number of panelists who rated the test cosmetic as superior to the control product (3 points), the test cosmetic was evaluated according to the following comprehensive evaluation criteria. [Overall evaluation criteria] ◎:80% or more (6~7 people) ○: 40% or more (3 to 5 people) ×: Less than 40% (0-2 people)

[0085] (2-4) Stability over time The test cosmetic was filled into a standard glass bottle and stored in a thermostatic chamber at 45°C for two weeks or one month. After storage, the cosmetic was visually inspected to evaluate its stability over time for "syneresis, separation, and poor emulsification" and "gelation and polymer aggregation" according to the following criteria.

[0086] [Presence or absence of syneresis, separation, and poor emulsification] ○: The entire cosmetic is uniform, and no syneresis, layer separation, or other emulsification defects are observed. △: Signs of syneresis and layer separation are observed, but the degree is slight and not significant. ×: Separation and layer separation were observed in the cosmetic material

[0087] [Gelling and polymer aggregation] ○: The entire cosmetic is uniform, and no gelation or polymer aggregation is observed. △: Signs of gelation and polymer aggregation are observed, but the degree is slight and not significantly different ×: Gelation and polymer aggregation were observed in the cosmetic.

[0088] [3. Evaluation Results] The results of various measurements are shown in Table 2. As shown in Table 2, the test cosmetics of Examples 1 to 8, which contained an (acrylate / acryloyldimethyltaurate) copolymer, a higher alcohol, and a water-soluble thickener along with a UV protection agent, had a fresh feel when used and were stable over time. Furthermore, the test cosmetics of Examples 1 to 8 could be easily produced by adding an aqueous phase to an oil phase to which an (acrylate / acryloyldimethyltaurate) copolymer had been added. It should be noted that these could also be produced by reversing the oil and aqueous phases. The test cosmetics of Examples 1 to 8 had a pH within the range of 5.8 to 6.8, SPF 40 or higher, and PA+++ or higher.

[0089] In contrast, the test cosmetics of Comparative Examples 1 to 5, which lacked at least one of the higher alcohol and water-soluble thickener, did not have a fresh feel when used, and / or felt sticky, and / or were not stable over time. In particular, in Comparative Examples 1 to 3, the cosmetics hardened slightly, and when spread and left for a while, they dried out and cracked. Furthermore, when applied to the skin, solid matter was generated in the latter half of application. This is thought to be due to the progression of gelation caused by the disappearance of the oil (higher alcohol) and moisture-retaining components remaining on the skin.

[0090] Furthermore, Comparative Examples 6 and 7, which contained a large amount of higher alcohol or water-soluble thickener, did not provide a fresh feeling when used and / or were sticky.

[0091] From the above results, it can be seen that the oil-in-water sunscreen cosmetic containing an (acrylate / acryloyldimethyltaurate) copolymer, a higher alcohol, and a water-soluble thickener together with a UV protection agent is an oil-in-water sunscreen cosmetic that, despite containing a UV protection agent, has a fresh feel when used and good stability over time, regardless of the presence or absence of ethanol or a volatile cyclic silicone oil, and can be easily produced.

[0092] [Table 1]

[0093] [Table 2]

[0094] Among the ingredients and raw materials in Table 1, the names of the products used are listed below. *1 (Sodium acrylate / sodium acryloyldimethyltaurate) copolymer: isohexadecane, polysorbate 80: "SIMULGEL EG QD" (SEPPIC) *2 Cetanol: "Cetanol" (Kyukyu Alcohol Kogyo Co., Ltd.) *3 Xanthan gum: "Monart Gum 80N" (MP Gokyo Food & Chemical Co., Ltd.) *4 Surface-treated titanium dioxide (fine particles), ethylhexyl palmitate, polyhydroxystearic acid: "IOPP40TK1J" (manufactured by KOBO Dispatec, particle size 15 nm, powder concentration 40%) *5 Ethylhexyl methoxycinnamate: "Uvinal MC80" (BASF Japan) *6 Diethylaminohydroxybenzoyl hexyl benzoate: "Uvinal A Plus Granular" (BASF Japan) *7 Coloring materials: titanium dioxide, mica, red iron oxide, ultramarine, red 202, blue 1 *8 Pigment dispersant: Polyglyceryl-2 triisostearate, triethylhexanoin, diisostearyl malate, polyhydroxystearic acid

[0095] Formulation Examples 1 to 5 are shown in Tables 3 to 7 below as other specific examples of oil-in-water sunscreen cosmetics that have a fresh feel in use, good stability over time, and can be easily produced, similar to the test cosmetics of Examples 1 to 8.

[0096] [Table 3]

[0097] [Table 4]

[0098] [Table 5]

[0099] [Table 6]

[0100] [Table 7] [Industrial Applicability]

[0101] The oil-in-water sunscreen cosmetic composition of one embodiment of the present invention has an ultraviolet protection effect due to the ultraviolet protection agent, is pleasant to use, and is stable over time, and therefore can be used as a sunscreen cosmetic such as an emulsion or cream. By using the oil-in-water sunscreen cosmetic composition of one embodiment of the present invention, users can expect to protect their skin from ultraviolet rays and prevent sunburn in a comfortable daily manner.

Claims

1. An oil-in-water sunscreen cosmetic, The following components (A) to (D) (A) (Acrylate / Acryloyldimethyltaurate) Copolymer (B) higher alcohol (C) Water-soluble thickener (D) UV protection agent Including, The content of the component (A) is 0.5% by mass to 1.0% by mass, the ratio of the content of the component (C) to the content of the component (A) [component (C) / component (A)] is 0.4 or less; and The cosmetic preparation, wherein the total content of the components (A) to (C) is 1.0% by mass to 2.0% by mass.

2. 2. The cosmetic preparation according to claim 1, wherein the ratio of the content of said component (B) to the content of said component (A) [component (B) / component (A)] is 2.0 or less.

3. The cosmetic preparation according to claim 1, further comprising substantially no (E) ethanol or volatile cyclic silicone oil.

4. The cosmetic preparation according to any one of claims 1 to 3, wherein the content of the component (B) is 0.1% by mass to 1.4% by mass.

5. The cosmetic preparation according to any one of claims 1 to 3, wherein the content of the component (C) is 0.05% by mass to 0.35% by mass.

6. The cosmetic preparation according to any one of claims 1 to 3, wherein the component (B) is at least one higher alcohol selected from the group consisting of higher alcohols having 12 to 22 carbon atoms.

7. The cosmetic preparation according to any one of claims 1 to 3, wherein the component (C) is at least one water-soluble thickener selected from the group consisting of microbial-derived thickeners, seaweed-based thickeners, cellulose-based thickeners, amino acid-based thickeners, polyethylene glycol-based thickeners, inorganic water-soluble polymers, and starch-based thickeners.

8. The cosmetic according to any one of claims 1 to 3, wherein the component (D) is an ultraviolet protection agent containing effective amounts of both an ultraviolet absorber and an ultraviolet scattering agent.

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