Oil-in-water emulsion cosmetic

Abstract

Provided is an oil-in-water emulsion cosmetic which contains pigment-grade hydrophobized particles and a salt- or acid-form skin whitening agent and / or a salt- or acid-form anti-inflammatory agent and is excellent in terms of emulsion stability and tone-up property.　This oil-in-water emulsion cosmetic comprises a dispersion medium including water and oil droplets dispersed in the dispersion medium, wherein the dispersion medium contains at least one agent selected from the group consisting of skin whitening agents and anti-inflammatory agents and further contains pigment-grade hydrophobized particles, the skin whitening agents including at least one agent selected from the group consisting of salt-form skin whitening agents and acid-form skin whitening agents and the anti-inflammatory agents including at least one agent selected from the group consisting of salt-form anti-inflammatory agents and acid-form anti-inflammatory agents.

Description

Oil-in-water emulsion cosmetics

[0001] The present disclosure relates to an oil-in-water emulsion cosmetic.

[0002] In the field of cosmetics, oil-in-water emulsion cosmetics containing powders such as pigments, salt-type drugs, etc. have been developed.

[0003] Patent Document 1 discloses an oil-in-water emulsion type composition containing, in a physiologically acceptable aqueous medium, i) at least one polymer containing a sulfonic acid group, ii) a polysaccharide modified with a hydrophobic chain, and iii) at least one (meth)acrylic acid polymer and / or one silicone surfactant selected from oxyethylenated polydimethylsiloxanes, and a pigment and / or a filler.

[0004] Patent Document 2 discloses an oil-in-water emulsion composition containing (A) a salt-type drug, (B) a hydrophilic nonionic surfactant, (C) an N-long-chain acyl acidic amino acid monosalt, (D) an alkali constituting two or more types of higher fatty acids and higher fatty acid soap, (E) a higher alcohol, (F) an oil component, and (G) water, and in which the emulsion particles are refined by high-pressure emulsification.

[0005] Patent Document 3 discloses an oil-in-water emulsion composition containing (A) 0.01 to 2.0% by mass of a water-soluble gelling agent, (B) 0.01 to 1.0% by mass of a water-soluble thickener, (C) 0.01 to 2.0% by mass of a gemini type anionic surfactant, (D) a water-soluble whitening agent, (E) an electrolyte other than (D), and (F) an oil.

[0006] JP-T-2016-529275 A JP-A-2012-126705 A JP-A-2019-142825 A

[0007] In oil-in-water emulsion cosmetics, generally, hydrophobically treated particles are blended in the oil phase (oil droplets), and a salt-type or acid-type drug is blended in the aqueous phase (dispersion medium).

[0008] As described in Patent Document 1 (

[0010] ), Patent Document 2 (

[0002]

[0003] ), and Patent Document 3 (

[0002] ), it is known in the art that the use of powders (e.g., pigments, fillers), salt-type agents, and the like destabilizes the emulsification performance of oil-in-water emulsion cosmetics.

[0009] Furthermore, for example, in order to achieve a tone-up effect that brightens the skin color, relatively large pigment-grade hydrophobic treated particles may be used as hydrophobic treated particles to be blended into oil-in-water emulsion cosmetics.

[0010] When an oil-in-water emulsion cosmetic containing such hydrophobically treated particles in the oil phase (oil droplets) is applied to the skin, the oil droplets containing the hydrophobically treated particles tend to adsorb and remain near the skin's ridges or sulci, which have high surface activity, with the oil attracted by the particles. As a result, oil containing hydrophobically treated particles (e.g., pigment-grade hydrophobically treated particles) is difficult to apply evenly to the skin, which can result in uneven toning.

[0011] Therefore, a subject of the present disclosure is to provide an oil-in-water emulsion cosmetic that contains pigment-grade hydrophobically treated particles and a salt-type or acid-type whitening agent and / or anti-inflammatory agent, and that has excellent emulsion stability and tone-up properties.

[0012] Aspect 1: An oil-in-water emulsion cosmetic comprising: a dispersion medium containing water; and oil droplets dispersed in the dispersion medium, wherein the dispersion medium contains at least one selected from the group consisting of a whitening agent and an anti-inflammatory agent, and pigment-grade hydrophobized particles; the whitening agent contains at least one selected from the group consisting of a salt-type whitening agent and an acid-type whitening agent; and the anti-inflammatory agent contains at least one selected from the group consisting of a salt-type anti-inflammatory agent and an acid-type anti-inflammatory agent. Aspect 2: The cosmetic according to Aspect 1, wherein the oil droplets contain a nonionic surfactant. Aspect 3: The cosmetic according to Aspect 1 or 2, wherein the oil droplets contain a higher alcohol. Aspect 4: The cosmetic according to any one of Aspects 1 to 3, wherein the dispersion medium contains polyether-modified silicone having an HLB of more than 10.0 and not more than 18.0. Aspect 5: The cosmetic according to Aspect 4, wherein the mass ratio of the pigment-grade hydrophobized particles to the polyether-modified silicone is 10 or more. Aspect 6: The cosmetic preparation according to any one of Aspects 1 to 5, wherein the salt-type whitening agent is at least one selected from the group consisting of ascorbate, tranexamate, glycyrrhizinate, nicotinate, kojic acid, ellagic acid, 1-piperidinepropionic acid, 3-O-ethyl-L-ascorbate, and alkoxysalicylate, and the acid-type whitening agent is at least one selected from the group consisting of ascorbic acid, tranexamic acid, glycyrrhizinate, nicotinic acid, kojic acid, ellagic acid, 1-piperidinepropionic acid, 3-O-ethyl-L-ascorbic acid, and alkoxysalicylic acid. Aspect 7: The cosmetic preparation according to any one of Aspects 1 to 6, wherein the anti-inflammatory agent is at least one selected from the group consisting of magnesium L-ascorbyl phosphate, dipotassium glycyrrhizinate, and ammonium glycyrrhizinate. Aspect 8: The cosmetic according to any one of Aspects 1 to 7, wherein the at least one selected from the group consisting of the salt-type whitening agent, the acid-type whitening agent, the salt-type anti-inflammatory agent, and the acid-type anti-inflammatory agent is contained in an amount of 50% by mass or more relative to the total amount of the whitening agent component and the anti-inflammatory agent component. Aspect 9: The cosmetic according to any one of Aspects 1 to 8, wherein the pigment-grade hydrophobized particles have an average particle size of 250 nm or more.Aspect 10: The cosmetic preparation according to any one of Aspects 1 to 9, wherein the content of the thickener is 1% by mass or less.

[0013] According to the present disclosure, it is possible to provide an oil-in-water emulsion cosmetic that contains pigment-grade hydrophobized particles and a salt-type or acid-type whitening agent and / or anti-inflammatory agent, and that has excellent emulsion stability and tone-up properties.

[0014] (a) is a schematic diagram of an oil-in-water emulsion cosmetic according to one embodiment of the present disclosure, (b) is a schematic diagram of the cosmetic when applied to the skin and the moisture has dried, and (c) is a schematic diagram of the cosmetic when it has blended into the skin. (a) is a schematic diagram of an oil-in-water emulsion cosmetic containing oil droplets containing pigment-grade hydrophobized particles, and (b) is a schematic diagram of the cosmetic when it has blended into the skin.

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the present invention.

[0016] The oil-in-water emulsion cosmetic of the present disclosure comprises a dispersion medium containing water and oil droplets dispersed in the dispersion medium, the dispersion medium comprising at least one selected from the group consisting of a whitening agent and an anti-inflammatory agent, and pigment-grade hydrophobized particles, the whitening agent comprising at least one selected from the group consisting of a salt-type whitening agent and an acid-type whitening agent, and the anti-inflammatory agent comprising at least one selected from the group consisting of a salt-type anti-inflammatory agent and an acid-type anti-inflammatory agent.

[0017] Without being limited by theory, the mechanism by which the cosmetic composition of the present disclosure exhibits excellent emulsion stability and tone-up properties despite containing pigment-grade hydrophobized particles and a salt-type or acid-type whitening agent and / or anti-inflammatory agent is believed to be as follows.

[0018] As mentioned above, it is well known that the use of powders (e.g., pigments, fillers), salt-type agents, etc. generally destabilizes the emulsification performance of oil-in-water emulsion cosmetics. However, the present inventors have discovered that the emulsion stability of oil-in-water emulsion cosmetics is improved when a salt-type or acid-type whitening agent and / or anti-inflammatory agent is simultaneously blended with pigment-grade hydrophobized particles in the dispersion medium (aqueous phase) of the oil-in-water emulsion cosmetic.

[0019] When an oil-in-water emulsion cosmetic contains powders (e.g., pigments, fillers), salt-type drugs, etc., each of them individually carries a certain amount of charge, which is thought to disrupt the emulsification balance of the emulsified particles (oil droplets). On the other hand, the cosmetic of the present disclosure simultaneously contains pigment-grade hydrophobically treated particles and salt-type or acid-type whitening agents and / or anti-inflammatory agents. It is believed that salt-type or acid-type whitening agents and anti-inflammatory agents carry a negative charge in the aqueous phase, while pigment-grade hydrophobically treated particles carry a positive charge. As a result, the mutual attraction between the salt-type or acid-type whitening agents and anti-inflammatory agents and the pigment-grade hydrophobically treated particles becomes dominant, reducing their effect on the emulsified particles (oil droplets), thereby further improving emulsification performance.

[0020] Furthermore, as described above, when obtaining an oil-in-water emulsion cosmetic containing hydrophobically treated particles, the hydrophobically treated particles are generally blended into the oil phase because they are hydrophobic. However, the present inventors have discovered that blending pigment-grade hydrophobically treated particles into the aqueous phase of an oil-in-water emulsion cosmetic improves the tone-up effect when the cosmetic is applied to the skin.

[0021] In conventional oil-in-water emulsion cosmetics containing pigment-grade hydrophobized particles in the oil phase, it is believed that the pigment-grade hydrophobized particles 20 are present in a densely packed state in the oil phase, as shown in Figure 2(a).

[0022] When an oil-in-water emulsion cosmetic containing such pigment-grade hydrophobized particles in the oil phase is applied to the skin, the pigment-grade hydrophobized particles 20 and oil 40 are densely packed together and are thought to tend to be adsorbed relatively unevenly near the skin ridges or sulci, which are lipophilic and have high surface activity, as shown in Figure 2(b).

[0023] On the other hand, in the oil-in-water emulsion cosmetic of the present disclosure, which contains pigment-grade hydrophobized particles in the aqueous phase, when such a cosmetic is applied to the skin, the pigment-grade hydrophobized particles 20 are believed to be more likely to be uniformly adsorbed and remain on the skin than in an oil-in-water emulsion cosmetic which contains pigment-grade hydrophobized particles in the oil phase, as shown in Figure 1(b). As a result, the pigment-grade hydrophobized particles that contribute to the tone-up effect are uniformly distributed on the skin, which is believed to result in an improved tone-up effect compared to an oil-in-water emulsion cosmetic which contains pigment-grade hydrophobized particles in the oil phase.

[0024] <Oil-in-Water Emulsion Cosmetic> <Dispersion Medium> The dispersion medium (aqueous phase) in the oil-in-water emulsion cosmetic of the present disclosure contains at least one selected from the group consisting of water, pigment-grade hydrophobized particles, a whitening agent, and an anti-inflammatory agent.

[0025] (Water) The amount of water to be blended is not particularly limited, and, for example, from the viewpoint of emulsion stability and the like, the amount of water may be 30% by mass or more, 40% by mass or more, 50% by mass or more, 60% by mass or more, 70% by mass or more, or 80% by mass or more, relative to the total amount of the cosmetic, and may be 90% by mass or less, 80% by mass or less, 70% by mass or less, or 60% by mass or less.

[0026] There are no particular limitations on the water that can be used in the oil-in-water emulsion cosmetic of the present disclosure, and for example, water used in cosmetics and quasi-drugs can be used, such as ion-exchanged water, distilled water, ultrapure water, and tap water.

[0027] (Pigment-grade hydrophobized particles) The amount of pigment-grade hydrophobized particles to be blended is not particularly limited and can be appropriately selected based on the desired effect (e.g., tone-up effect, SPF) depending on the application. The amount of pigment-grade hydrophobized particles to be blended can be, for example, 0.5% by mass or more, 1.0% by mass or more, or 1.5% by mass or more relative to the total amount of the cosmetic, and can be 15% by mass or less, 12% by mass or less, 10% by mass or less, 8.0% by mass or less, 6.0% by mass or less, or 5.0% by mass or less.

[0028] The average particle size of the pigment-grade hydrophobic treated particles can be appropriately selected so as to obtain the desired effect (e.g., tone-up effect, SPF) depending on the application. The average particle size of the pigment-grade hydrophobic treated particles can be, for example, 250 nm or more, 300 nm or more, 350 nm or more, or 400 nm or more. Pigment-grade hydrophobic treated particles with an average particle size of 300 nm or more can preferably exhibit a tone-up effect that brightens skin color. The upper limit of the average particle size is not particularly limited, and can be, for example, 100 μm or less, 70 μm or less, 50 μm or less, 30 μm or less, 10 μm or less, 5 μm or less, 1 μm (1,000 nm) or less, 800 nm or less, 700 nm or less, or 600 nm or less. Here, the average particle size of the pigment-grade hydrophobic treated particles and the hydrophobic treated fine particles of optional components described below may be the size of primary particles or aggregated secondary particles, and can be calculated by static light scattering.

[0029] The hydrophobic treatment for pigment-grade hydrophobized particles is not particularly limited, and may be any treatment that modifies the surface of such particles with an organic compound to hydrophobize them, such as silicone-based or silane-based treatments using methylhydrogenpolysiloxane, dimethylpolysiloxane (dimethicone), alkylsilane, etc.; fluorine-based treatments using perfluoroalkyl phosphate esters, perfluoroalcohols, etc.; titanate-based treatments using alkyl titanates, etc.; amino acid treatments using N-acylglutamic acid, etc.; and other treatments such as lecithin treatment, metal soap treatment, fatty acid treatment, and alkyl phosphate ester treatment. The hydrophobization treatments may be used alone or in combination. The hydrophobization treatment may also be carried out using a hydrophobization treatment agent.

[0030] Examples of silicones usable as hydrophobic treatment agents include known silicones having a hydrogen-silicon bond, such as methylhydrogenpolysiloxane (dimethicone / methicone) copolymer. Other examples include triethoxysilylethylpolydimethylsiloxyethyldimethicone and triethoxysilylethylpolydimethylsiloxyethylhexyldimethicone, which have an alkoxy group-silicon bond as a reactive group. Dimethylpolysiloxanes can also be used.

[0031] Examples of the silane-based treatment agent include a silylating agent having an organic group introduced therein and a silane coupling agent, such as triethoxycaprylylsilane.

[0032] Examples of titanate-based treatment agents include titanium coupling agents such as alkyl titanates, pyrophosphate-type titanates, phosphorous-type titanates, and amino acid-type titanates.

[0033] The type of particles constituting the pigment-grade hydrophobic treated particles is not particularly limited and can be appropriately selected to obtain the desired effect (e.g., tone-up effect, SPF) depending on the application. Examples of pigment-grade hydrophobic treated particles include inorganic particles, specifically inorganic oxide particles, such as titanium oxide particles, zinc oxide particles, and cerium oxide particles (sometimes referred to as "inorganic white pigments"). In addition, inorganic particles generally classified as pearlescent agents (luminescent pigments), colorants, or phosphors can also be used as the pigment-grade hydrophobic treated particles of the present disclosure. Organic particles can also be used as the pigment-grade hydrophobic treated particles of the present disclosure. The pigment-grade hydrophobic treated particles can be used alone or in combination of two or more types.

[0034] In the present disclosure, the term "pearl-forming agent" does not include coloring materials or phosphors, and refers to particles that exhibit brilliance. Pearling agents typically have a flat, flaky or scale-like form. In addition, in the present disclosure, the term "coloring agent" refers to a material that exhibits a color other than white, does not include pearling agents or phosphors, and does not exhibit brilliance, which can cause cosmetics to develop color. For example, from the perspective of achieving a tone-up effect, when a pearling agent is used, it is preferable to use it in combination with inorganic oxide particles such as the titanium oxide particles described above and / or a phosphor. When a coloring agent is used, it is preferable to use it in combination with at least one selected from inorganic oxide particles such as the titanium oxide particles described above, a pearling agent, and a phosphor.

[0035] Examples of pearlescent agents include titanium mica (titanium mica), iron oxide-coated titanium mica, carmine-coated titanium mica, carmine- and ferric iron oxide-coated titanium mica, iron oxide- and carmine-treated titanium mica, ferric iron oxide-treated titanium mica, iron oxide- and ferric iron oxide-treated titanium mica, chromium oxide-treated titanium mica, black titanium oxide-treated titanium mica, acrylic resin-coated aluminum powder, silica-coated aluminum powder, silica-coated mica, titanium oxide-coated mica, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, colored titanium oxide-coated mica, titanium oxide-coated synthetic mica, titanium oxide-coated silica, titanium oxide-coated alumina, titanium oxide-coated glass powder, polyethylene terephthalate-polymethyl methacrylate laminated film powder, bismuth oxychloride, fish scale foil, iron oxide-coated titanium oxide-coated mica such as red iron oxide-coated titanium oxide-coated mica, and hollow titanium oxide powder having silica sandwiched between the mica and titanium oxide coating layer. These are typically white or another color.

[0036] Colorless pearlescent agents can also be used. Examples of such pearlescent agents include those known as transparent pearlescent agents (transparent luster pigments). For example, pearlescent agents can be used that use glass particles as a base material and have a coating formed on the surface of the particles, the coating being made of a high refractive index material such as titanium oxide.

[0037] As the coloring material, for example, an inorganic pigment can be used.

[0038] Examples of inorganic pigments include inorganic red pigments (e.g., iron oxide (red iron oxide), iron titanate, etc.); inorganic brown pigments (e.g., γ-iron oxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide, ochre, etc.); inorganic black pigments (e.g., black iron oxide, low-order titanium oxide, etc.); inorganic purple pigments (e.g., manganese violet, cobalt violet, etc.); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine, Prussian blue, etc.); and metal powders (e.g., aluminum, gold, silver, copper, etc.).

[0039] The phosphor may be, for example, MnCl ２ (red), Sm ２ (SO ４ ) ３ ・8H ２ O (orange), CaWO ４ (blue), MgWO ４ (blue-white), CaMoO ４ (yellow-green), KCl:Tl (blue-green), NaCl:Mn (red), ZnO:Zn (white-green), CaS:Bi (purple), ZnS:Cu (yellow-green), ZnS:Ag (purple), Zn ２ SiO ４ : Mn (green), Ca ３ (P.O. ４ ) ２ :Ce:Mn (red), Y ２ O ３ : Eu, YVO ４ : Eu, Y ２ O ２ S: Eu, (Y, Cd)BO ３ :Eu, 0.5MgF ２ GeO ２ : Mn, Zn ２ GeO ４ :Mn, ZnS:Cu, ZnS:Cu,Al, (Zn,Cd)S:Cu,Zn ２ SiO ４ :Mn, BaMgAl １４ O ２３ :Eu ２＋ , Mn ２＋ , SrGa ２ S ４ :Eu２＋ , ZnS:Cu, Co, ZnS:Ag, Cu, Y ２ SiO ５ :Ca, ZnS:Ag, Ga, Cl, Ga ２ B ５ O ９ Cl:Eu ２＋ BaMgAl １４ O ２３ :Eu ２＋ , (Zn, Cd)S:Ag, (Zn,Cd)S:Ag,Al, (Zn,Cd)S:Au,Al, ZnS:Cu,Au,Al,Zn( S, Se): Ag, Zn (S, Se): Ag, Al, Zn (S, Se): Cu, Zn (S, Se): Cu, Al, ZnO: Zn, Zn ２ SiO ４ :Mn, ZnS:Ag, Cu, ZnS:Pb, Cu, Gd ２ O ２ S: Tb, La ２ O ２ S: Tb, Y ３ Al ５ O １２ :Ce, (Y,Gd)3Al ５ O １２ : Ce, SrGa ２ S ４ : Eu, Y ２ O ２ S: Tb, Y ２ SiO ５ :Tb, 3.5MgGeO ２ :Mn, 3BaMgO・8Al ２ O ３ :Eu ２＋ , Mn ２＋ , 3BaMgO・8Al ２ O ３ :Eu ２＋ In addition, for example, In ２ O ３ Examples of suitable phosphors include a luminescent composition containing a predetermined amount of ZnO and ZnS:Ag, and a luminescent composition containing a predetermined amount of ZnO and ZnS:Ag phosphor. Among these, zinc oxide phosphor (ZnO:Zn) is preferred from the viewpoint of safety. Zinc oxide phosphors can be obtained by firing zinc oxide in a reducing atmosphere such as H2 or CO2. In addition, magnesium titanate phosphors can also be suitably used.

[0040] (Whitening Agent) In some embodiments, the oil-in-water emulsion cosmetic of the present disclosure includes, in the dispersion medium (aqueous phase), at least one whitening agent selected from the group consisting of salt-type whitening agents and acid-type whitening agents.

[0041] The amount of the whitening agent is not particularly limited, and can be, for example, 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.7% by mass or more, or 1.0% by mass or more relative to the total amount of the cosmetic, and can be 15.0% by mass or less, 10.0% by mass or less, 8.0% by mass or less, or 5.0% by mass or less.

[0042] Such whitening agents are not particularly limited as long as they exhibit a whitening effect, and examples thereof include at least one acid-type whitening agent selected from ascorbic acid (L-ascorbic acid), tranexamic acid, glycyrrhizic acid, nicotinic acid, kojic acid, ellagic acid, 1-piperidinepropionic acid, 3-O-ethyl-L-ascorbic acid, and alkoxysalicylic acids (e.g., 4-methoxysalicylic acid); and at least one salt-type whitening agent selected from ascorbate, tranexamate, glycyrrhizinate, nicotinate, kojate, ellagate, 1-piperidinepropionic acid, 3-O-ethyl-L-ascorbate, and alkoxysalicylate (e.g., 4-methoxysalicylate). Examples of salts of salt-type whitening agents include alkali metal salts such as sodium salts and potassium salts; alkaline earth metal salts such as calcium salts and magnesium salts; zinc salts; iron salts; ammonium salts; salts with basic amino acids such as arginine, lysine, histidine, and ornithine; and salts with amines such as monoethanolamine, diethanolamine, and triethanolamine. The salt-type whitening agents and acid-type whitening agents can each be used alone or in combination of two or more.

[0043] Whitening agents other than salt-type whitening agents and acid-type whitening agents (sometimes referred to as "other whitening agents") may be used in combination. Examples of such whitening agents include ascorbic acid derivatives (e.g., ascorbic acid glucoside), tranexamic acid derivatives, glycyrrhizic acid derivatives, nicotinic acid derivatives (e.g., niacinamide), kojic acid derivatives (e.g., kojic acid dipalmitate), ellagic acid derivatives, alkoxysalicylic acid derivatives, hydroquinone, α-arbutin, β-arbutin, nicotinamide, astaxanthin, histidine dithiooctanamide (Na / zinc), chamomile extract, licorice extract, placenta extract, rosemary extract, rucinol, magnolignan, etc. The other whitening agents may be used alone or in combination of two or more.

[0044] When the cosmetic preparation of the present disclosure contains a salt-type whitening agent and / or an acid-type whitening agent, the cosmetic preparation simultaneously contains pigment-grade hydrophobized particles in the aqueous phase, thereby improving the emulsion stability of the cosmetic preparation even when a high content of the salt-type whitening agent and / or the acid-type whitening agent is contained as the whitening agent. Specifically, the cosmetic preparation of the present disclosure may contain at least one selected from the group consisting of a salt-type whitening agent and an acid-type whitening agent in an amount of 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, or 90% by mass or more relative to the total amount of the whitening agent components.

[0045] (Anti-inflammatory Agent) In some embodiments, the oil-in-water emulsion cosmetic of the present disclosure includes, in the dispersion medium (aqueous phase), at least one anti-inflammatory agent selected from the group consisting of salt-type anti-inflammatory agents and acid-type anti-inflammatory agents.

[0046] The amount of the anti-inflammatory agent is not particularly limited, and can be, for example, 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.7% by mass or more, or 1.0% by mass or more relative to the total amount of the cosmetic, and can be 15.0% by mass or less, 10.0% by mass or less, 8.0% by mass or less, or 5.0% by mass or less.

[0047] Such anti-inflammatory agents are not particularly limited as long as they exhibit anti-inflammatory activity. However, agents that exhibit both whitening and anti-inflammatory activity are considered to be whitening agents in the present disclosure. Examples of anti-inflammatory agents include magnesium L-ascorbyl phosphate, glycyrrhizin, dipotassium glycyrrhizinate, ammonium glycyrrhizinate, and allantoin. The salt-type anti-inflammatory agents and acid-type anti-inflammatory agents can each be used alone or in combination of two or more.

[0048] Anti-inflammatory agents other than salt-type anti-inflammatory agents and acid-type anti-inflammatory agents (sometimes referred to as "other anti-inflammatory agents") may also be used in combination. When the cosmetic preparation of the present disclosure contains a salt-type anti-inflammatory agent and / or an acid-type anti-inflammatory agent, the cosmetic preparation simultaneously contains pigment-grade hydrophobized particles in the aqueous phase. This allows the emulsion stability of the cosmetic preparation to be improved even when a high content of a salt-type anti-inflammatory agent and / or an acid-type anti-inflammatory agent is contained as the anti-inflammatory agent. Specifically, the cosmetic preparation of the present disclosure may contain at least one selected from the group consisting of salt-type anti-inflammatory agents and acid-type anti-inflammatory agents in an amount of 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, or 90% by mass or more relative to the total amount of the anti-inflammatory agent components.

[0049] When the above-mentioned whitening agent is also taken into consideration, the cosmetic composition of the present disclosure may contain at least one selected from the group consisting of a salt-type whitening agent, an acid-type whitening agent, a salt-type anti-inflammatory agent, and an acid-type anti-inflammatory agent in an amount of 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, or 90% by mass or more relative to the total amount of the whitening agent component and the anti-inflammatory agent component.

[0050] From the viewpoint of emulsion stability of the cosmetic, the mass ratio of the pigment-grade hydrophobized particles to the total amount of the whitening agent component and the anti-inflammatory agent component is preferably 5.0 or less, 4.5 or less, 4.0 or less, 3.5 or less, 3.0 or less, 2.5 or less, 2.0 or less, 1.5 or less, 1.0 or less, less than 1.0, or 0.9 or less. The lower limit of this mass ratio is preferably 0.1 or more, 0.3 or more, or 0.5 or more.

[0051] <Oil Droplets> The oil droplets serving as the oil phase or dispersed phase in an oil-in-water emulsion cosmetic contain oil.

[0052] (Oil Content) The oil content in the oil-in-water emulsion cosmetic of the present disclosure is not particularly limited, and can be, for example, 1.0% by mass or more, 2.0% by mass or more, 3.0% by mass or more, 5.0% by mass or more, 7.0% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, or 30% by mass or more, relative to the total amount of the cosmetic, and can also be 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 15% by mass or less, or 10% by mass or less.

[0053] A cosmetic composition containing a high amount of oil, for example, 20% by mass or more, can increase the content of, for example, an ultraviolet absorber and optional hydrophobic treated fine particles, which can be blended into the oil phase, and therefore can further improve the ultraviolet protection effect (SPF).

[0054] The type of oil is not particularly limited, and for example, volatile oils and non-volatile oils can be used. The oils can be used alone or in combination of two or more. Here, "volatile" refers to a material that exhibits a volatile content of more than 5% when left at 105°C under atmospheric pressure for 3 hours. From the viewpoint of film uniformity, the volatile content, which serves as an indicator of volatility, is preferably 10% or more, 20% or more, 40% or more, 50% or more, 60% or more, 80% or more, or 100%. Alternatively, the boiling point at 1 atmosphere (101.325 kPa) can be used as an indicator of volatility. From the viewpoint of film uniformity, the boiling point is preferably 250°C or less, 240°C or less, or 230°C or less, and is preferably 80°C or more, 100°C or more, 120°C or more, 150°C or more, or 160°C or more. In addition, in the present disclosure, "non-volatile" refers to a material that exhibits a volatile content of 5% or less when left at 105°C for 3 hours.

[0055] The volatile oil is not particularly limited, and examples thereof include volatile silicone oils and volatile hydrocarbon oils. The volatile oils may be used alone or in combination.

[0056] Examples of volatile silicone oils include volatile acyclic silicone oils and volatile cyclic silicone oils, with volatile acyclic silicone oils being preferred.

[0057] As the volatile acyclic silicone oil, for example, a volatile linear silicone oil and a volatile branched silicone oil can be used, of which the volatile linear silicone oil is preferred.

[0058] Examples of volatile linear silicone oils include low-molecular-weight linear dimethylpolysiloxanes such as dimethylpolysiloxane with a viscosity of 0.65 cSt (sometimes referred to as "dimethicone"), dimethylpolysiloxane with a viscosity of 1 cSt, dimethylpolysiloxane with a viscosity of 1.5 cSt, and dimethylpolysiloxane with a viscosity of 2 cSt. Of these, dimethylpolysiloxane with a viscosity of 1 cSt and dimethylpolysiloxane with a viscosity of 1.5 cSt are preferred. Here, these viscosities refer to kinematic viscosities in an atmosphere at 25°C.

[0059] Examples of volatile branched silicone oils include low molecular weight branched siloxanes such as methyl trimethicone, tris(trimethylsilyl)methylsilane, and tetrakis(trimethylsilyl)silane.

[0060] Volatile cyclic silicone oils include, for example, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

[0061] Examples of volatile hydrocarbon oils include heptane, isododecane, isohexadecane, and isodecane, with isododecane being preferred.

[0062] The amount of volatile oil in the oil content can be, for example, 0% by mass or more, 5% 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 45% by mass or more, or 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, 70% by mass or less, 65% by mass or less, 60% by mass or less, 55% by mass or less, or 50% by mass or less, relative to the total oil content. In this case, the remaining oil content can be non-volatile oil.

[0063] In addition to the above-mentioned volatile oils, the oils can also include oils commonly used in cosmetics, such as liquid oils, solid oils, waxes, hydrocarbon oils other than those mentioned above, silicone oils other than those mentioned above, polar oils, and higher alcohols. When other oils (e.g., non-volatile oils) are used in combination with volatile oils, after the volatile oil volatilizes, the other oils can function as binders between the particles and the skin, thereby favorably fixing the particles to the skin. The other oils can be used alone or in combination of two or more. Here, some ultraviolet absorbers act as oils, particularly polar oils. Such ultraviolet absorbers can also be considered as oils.

[0064] Examples of liquid oils and fats include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, camellia oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, and triglycerin.

[0065] Examples of solid fats and oils include cocoa butter, coconut oil, horse fat, hardened coconut oil, palm oil, beef tallow, mutton tallow, hardened beef tallow, palm kernel oil, lard, beef bone fat, Japan wax kernel oil, hardened oil, beef foot fat, Japan wax, and hardened castor oil.

[0066] Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, privet wax, spermaceti, montan wax, rice bran wax, lanolin, kapok wax, acetated lanolin, liquid lanolin, sugarcane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.

[0067] Examples of hydrocarbon oils include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax, and olefin oligomers.

[0068] Examples of silicone oils include chain silicones such as dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane (diphenylsiloxyphenyltrimethicone), and methylhydrogenpolysiloxane, all of which have a viscosity of 6 cSt or more.

[0069] As the polar oil, for example, a polar oil having an IOB of 0.10 or more can be used. Examples of such polar oils include isopropyl myristate (IOB value = 0.18), octyl palmitate (IOB value = 0.13), isopropyl palmitate (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), isononyl isononanoate (IOB value = 0.20), and isotridecyl isononanoate (IOB value = 0.11). OB value = 0.15), cetyl ethylhexanoate (IOB value = 0.13), pentaerythrityl tetraethylhexanoate (IOB value = 0.35), diethylhexyl succinate (IOB value = 0.32), dioctyl succinate (IOB value = 0.36), glycol distearate (IOB value = 0.16), glyceryl diisostearate (IOB value = 0.29), neopentyl glycol dicaprate (IOB value = 0.25), diisostearyl malate (IOB value = 0.28 ), trimethylolpropane triisostearate (IOB value = 0.16), glyceryl tri-2-ethylhexanoate (triethylhexanoin) (IOB value = 0.35), trimethylolpropane trioctanoate (IOB value = 0.33), trimethylolpropane triisostearate (IOB value = 0.16), diisobutyl adipate (IOB value = 0.46), N-lauroyl-L-glutamic acid-2-octyldodecyl ester (IOB value = 0.29), adipic acid 2-Hexyldecyl (IOB value=0.16), diisopropyl sebacate (IOB value=0.40), 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).

[0070] Examples of UV absorbers that can be considered to be oils include UV absorbers with an IOB of 0.10 or more, specifically organic UV absorbers such as ethylhexyl methoxycinnamate, octocrylene, polysilicone-15, t-butyl methoxydibenzoylmethane, ethylhexyl triazone, bisethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoylhexyl benzoate, oxybenzone-3, methylenebisbenzotriazolyltetramethylbutylphenol, homosalate, and ethylhexyl salicylate. These UV absorbers can be used alone or in combination of two or more.

[0071] The IOB value of the polar oil and the UV absorber can be, for example, 0.11 or more, 0.12 or more, or 0.13 or more, and can be 0.50 or less, 0.45 or less, or 0.40 or less. Here, the IOB value is an abbreviation for Inorganic / Organic Balance (inorganic / organic ratio), and is a value representing the ratio of the inorganic value to the organic value, and is an index showing the degree of polarity of the 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).

[0072] As the higher alcohol, for example, one having a carbon chain length of 16 or more can be used, and specific examples include linear or branched higher alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, monostearyl glycerin ether (batyl alcohol), 2-decyltetradecinol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, and octyldodecanol.

[0073] <Optional Components> The oil-in-water emulsion cosmetic of the present disclosure may contain various components as appropriate, as long as they do not adversely affect the effects of the present disclosure. Examples of the various components include additives that can be typically incorporated into cosmetics, such as anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, moisturizing agents, thickeners (e.g., water-soluble thickeners, oil-soluble thickeners), water-soluble polymers, oil-soluble polymers, film-forming agents such as siliconized polysaccharides, higher fatty acids (e.g., isostearic acid, behenic acid), sequestering agents, lower alcohols such as ethanol, polyhydric alcohols, various extracts, sugars, amino acids, organic amines, polymer emulsions, chelating agents, UV absorbers other than the above-mentioned UV absorbers, pH adjusters, neutralizing agents, skin nutrients, vitamins, water-soluble agents applicable to pharmaceuticals, quasi-drugs, cosmetics, etc., buffers, anti-fading agents, preservatives, dispersants, transdermal absorption inhibitors, propellants, fillers (e.g., usable powders such as silica), pigments other than those that can be used as the above-mentioned pearlescent agents and colorants (e.g., organic pigments), stabilizers, hydrophobically treated fine particles, dyes, colorants, and fragrances. Optional ingredients can be incorporated into the oil phase and / or the aqueous phase and can be used alone or in combination. Some of these ingredients are described below.

[0074] (Nonionic surfactant) In some embodiments, the oil-in-water emulsion cosmetic of the present disclosure contains a nonionic surfactant. Such an active agent can typically function as an emulsifier, and therefore the emulsified particles (oil droplets) can contain such an active agent.

[0075] Examples of nonionic surfactants include polyoxyalkylene alkyl ethers, polyalkylene glycol fatty acid esters, POE hydrogenated castor oil derivatives, POE alkyl ethers, POE-POP alkyl ethers, PEG fatty acid esters, polyglycerin fatty acid esters, POE glycerin fatty acid esters, PEG glyceryl isostearate, and silicone surfactants. Other nonionic surfactants such as polyglyceryl-2 diisostearate and sorbitan sesquiisostearate can also be used. These nonionic surfactants can be used alone or in combination.

[0076] Examples of polyoxyalkylene alkyl ethers include polyoxyethylene behenyl ether and polyoxyethylene stearyl ether.

[0077] Examples of polyalkylene glycol fatty acid esters include polyethylene glycol monostearate and polyethylene glycol monooleate.

[0078] Examples of POE hydrogenated castor oil derivatives (PEG hydrogenated castor oils) include POE (20-100) hydrogenated castor oil derivatives, specifically POE (20) hydrogenated castor oil derivatives, POE (40) hydrogenated castor oil derivatives, POE (60) hydrogenated castor oil derivatives, and POE (100) hydrogenated castor oil derivatives.

[0079] Examples of POE alkyl ethers include POE (2) lauryl ether, POE (4.2) lauryl ether, POE (9) lauryl ether, POE (5.5) cetyl ether, POE (7) cetyl ether, POE (10) cetyl ether, POE (15) cetyl ether, POE (20) cetyl ether, POE (23) cetyl ether, POE (4) stearyl ether, POE (20) stearyl ether, POE (7) oleyl ether, POE (10) oleyl ether, and POE (15) oleyl ether. ether, POE(20) oleyl ether, POE(50) oleyl ether, POE(10) behenyl ether, POE(20) behenyl ether, POE(30) behenyl ether, POE(2) (C12-15) alkyl ether, POE(4) (C12-15) alkyl ether, POE(10) (C12-15) alkyl ether, POE(5) secondary alkyl ether, POE(7) secondary alkyl ether, POE(9) alkyl ether, and POE(12) alkyl ether.

[0080] Examples of POE-POP alkyl ethers include POE(1) polyoxypropylene (POP)(4) cetyl ether, POE(10) POP(4) cetyl ether, POE(20) POP(8) cetyl ether, POE(20) POP(6) decyltetradecyl ether, and POE(30) POP(6) decyltetradecyl ether.

[0081] Examples of PEG fatty acid esters include polyethylene glycol monolaurate (hereinafter abbreviated as PEG) (10), PEG monostearate (10), PEG monostearate (25), PEG monostearate (40), PEG monostearate (45), PEG monostearate (55), PEG monostearate (100), PEG monooleate (10), PEG distearate, and PEG diisostearate.

[0082] Examples of polyglycerin fatty acid esters include hexaglyceryl monolaurate, hexaglyceryl monomyristate, hexaglyceryl monostearate, hexaglyceryl monooleate, decaglyceryl monolaurate, decaglyceryl monomyristate, decaglyceryl monostearate, decaglyceryl monoisostearate, decaglyceryl monooleate, decaglyceryl distearate, and decaglyceryl diisostearate.

[0083] Examples of POE glycerin fatty acid esters include polyoxyethylene (POE) (5) glyceryl monostearate, POE (15) glyceryl monostearate, POE (5) glyceryl monooleate, and POE (15) glyceryl monooleate.

[0084] Examples of PEG glyceryl isostearate include PEG(8) glyceryl isostearate, PEG(10) glyceryl isostearate, PEG(15) glyceryl isostearate, PEG(20) glyceryl isostearate, PEG(25) glyceryl isostearate, PEG glyceryl(30) isostearate, PEG(40) glyceryl isostearate, PEG(50) glyceryl isostearate, and PEG(60) glyceryl isostearate.

[0085] Examples of silicone surfactants include PEG(7) dimethicone and PEG(10) dimethicone.

[0086] The content of the nonionic surfactant is not particularly limited, and can be, for example, 0.03% by mass or more, 0.05% by mass or more, 0.07% by mass or more, or 0.1% by mass or more relative to the total amount of the cosmetic, and can be 3.0% by mass or less, 2.5% by mass or less, 2.0% by mass or less, 1.5% by mass or less, 1.0% by mass or less, or 0.5% by mass or less.

[0087] (Dispersant) In some embodiments, the oil-in-water emulsion cosmetic of the present disclosure contains a polyether-modified silicone (sometimes simply referred to as "polyether-modified silicone") having an HLB of more than 10.0 and not more than 18.0 in the dispersion medium. The polyether-modified silicone can function as a dispersant for pigment-grade hydrophobically treated particles, and can further improve the emulsion stability and tone-up properties of oil-in-water emulsion cosmetics containing salt-type or acid-type whitening agents and / or anti-inflammatory agents. The polyether-modified silicones can be used alone or in combination of two or more types.

[0088] From the viewpoints of dispersibility of pigment-grade hydrophobized particles, emulsion stability and tone-up properties of cosmetics, etc., the HLB of the polyether-modified silicone is preferably 10.5 or more, 11.0 or more, 11.5 or more, 12.0 or more, 12.5 or more, or 13.0 or more, and is preferably 17.5 or less, 17.0 or less, 16.5 or less, 16.0 or less, 15.5 or less, or 15.0 or less. Here, "HLB" generally refers to a value indicating affinity to water and oil, and is a parameter known as the hydrophilic-lipophilic balance. The HLB of the polyether-modified silicone can be easily determined by the Griffin method. Here, the HLB value according to the Griffin method can be determined by the following formula 1: HLB value = 20 × sum of formula weights of hydrophilic moieties / molecular weight ... formula 1

[0089] The amount of polyether-modified silicone may be set to 0.01% by mass or more, 0.03% by mass or more, or 0.05% by mass or more, relative to the total amount of the cosmetic, from the viewpoints of the dispersibility of pigment-grade hydrophobized particles in the aqueous phase, the emulsion stability and tone-up properties of the cosmetic, etc., and may be set to 1.0% by mass or less, 0.8% by mass or less, 0.5% by mass or less, 0.3% by mass or less, or 0.2% by mass or less.

[0090] From the viewpoints of dispersibility of the pigment-grade hydrophobized particles in the aqueous phase, emulsion stability and tone-up properties of the cosmetic, etc., the mass ratio of the pigment-grade hydrophobized particles to the polyether-modified silicone is, for example, preferably 5 or more, 7 or more, 10 or more, 12 or more, 14 or more, 15 or more, or 17 or more, and is also preferably 70 or less, 65 or less, 60 or less, 55 or less, 50 or less, 45 or less, 40 or less, 35 or less, or 30 or less.

[0091] The type of polyether-modified silicone is not particularly limited as long as it has a specific HLB, and examples thereof include PEG-9 dimethicone, PEG-10 dimethicone, PEG-12 dimethicone, PEG-10 methyl ether dimethicone, PEG-11 methyl ether dimethicone, PEG / PPG-20 / 20 dimethicone, PEG / PPG-20 / 23 dimethicone, and PEG-17 dimethicone. Of these, PEG-11 methyl ether dimethicone is preferred.

[0092] (Thickener) Generally, it is difficult to improve the emulsion stability of oil-in-water emulsion cosmetics containing powders, salt-type drugs, etc., so thickeners, particularly water-soluble thickeners, are usually used to ensure the emulsion stability of such cosmetics. However, although the incorporation of a thickener may improve emulsion stability, it is likely to cause a sticky feeling.

[0093] On the other hand, since the emulsion stability of the oil-in-water emulsion cosmetic of the present disclosure can be improved by simultaneously blending pigment-grade hydrophobized particles with a salt-type or acid-type whitening agent and / or anti-inflammatory agent, the cosmetic of the present disclosure does not need to substantially contain a thickener. That is, the thickener may be blended in at a ratio of 1% by mass or less, 0.5% by mass or less, 0.1% by mass or less, 0.01% by mass or less, or 0.001% by mass or less relative to the total amount of the cosmetic, but it is advantageous to not use a thickener from the standpoint of stickiness, etc.

[0094] (Hydrophobically Treated Microparticles) In some embodiments, the oil-in-water emulsion cosmetic of the present disclosure contains hydrophobically treated microparticles. From the viewpoints of UV protection effect, emulsion stability, etc., it is preferable that the hydrophobically treated microparticles are incorporated into the internal oil phase. Here, the above-mentioned pigment-grade hydrophobically treated particles and hydrophobically treated microparticles can be distinguished by their size. In other words, pigment-grade hydrophobically treated particles refer to hydrophobically treated particles having a particle diameter larger than that of hydrophobically treated microparticles.

[0095] The blending amount of the hydrophobized microparticles is not particularly limited and can be selected appropriately based on the desired effect (e.g., UV scattering effect) depending on the application. For example, the blending amount can be 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, or 5.0% by mass or more relative to the total amount of the cosmetic, and can also be 20% by mass or less, 17% by mass or less, 15% by mass or less, 13% by mass or less, 10% by mass or less, 8.0% by mass or less, 6.0% by mass or less, 5.0% by mass or less, 3.0% by mass or less, 1.0% by mass or less, 0.5% by mass or less, or 0.1% by mass or less.

[0096] For example, hydrophobic treated microparticles having an average particle diameter of 200 nm or less can exhibit an ultraviolet scattering effect. The average particle diameter of the hydrophobic treated microparticles can be appropriately selected based on the desired effect (e.g., ultraviolet scattering effect) depending on the application, and can be, for example, 200 nm or less, 180 nm or less, 150 nm or less, 120 nm or less, 100 nm or less, or 80 nm or less. There is no particular restriction on the lower limit of the average particle diameter of the hydrophobic treated microparticles, but it can be, for example, 10 nm or more, 20 nm or more, 30 nm or more, 40 nm or more, 50 nm or more, 60 nm or more, or 70 nm or more.

[0097] The hydrophobic treatment for the hydrophobic treated fine particles is not particularly limited, and for example, the same treatment as the hydrophobic treatment for the pigment-grade hydrophobic treated particles described above can be carried out.

[0098] The type of particles constituting the hydrophobic treated microparticles is not particularly limited and can be appropriately selected based on the desired effect (e.g., ultraviolet scattering effect) depending on the application. Examples include inorganic particles, specifically titanium oxide, zinc oxide, barium sulfate, iron oxide, talc, mica, sericite, kaolin, titanium mica, iron blue, chromium oxide, chromium hydroxide, silica, and cerium oxide. The hydrophobic treated microparticles can be used alone or in combination of two or more. When the hydrophobic treated microparticles are used as an ultraviolet scattering agent, it is preferable to use particles having a refractive index of 1.5 or more, such as zinc oxide particles or titanium oxide particles, from the viewpoint of optical properties, etc.

[0099] <Viscosity of Cosmetic> In some embodiments, the viscosity of the oil-in-water emulsion cosmetic of the present disclosure, measured at 30°C one day after preparation using the conditions and apparatus described in the Examples below, can be 10,000 mPa·s or less, 9,000 mPa·s or less, 8,000 mPa·s or less, 7,000 mPa·s or less, or 6,000 mPa·s or less, or can be 500 mPa·s or more, 1,000 mPa·s or more, 1,500 mPa·s or more, 2,000 mPa·s or more, or 2,500 mPa·s or more. Because the cosmetic of the present disclosure contains a salt-type or acid-type whitening agent and / or anti-inflammatory agent together with pigment-grade hydrophobized particles, it can exhibit good emulsification performance even at such a viscosity.

[0100] In some embodiments, the viscosity of the oil-in-water emulsion cosmetic of the present disclosure, measured at 0°C, 25°C, or 50°C four weeks after preparation using the conditions and apparatus described in the Examples below, can be 10,000 mPa·s or less, 9,000 mPa·s or less, 8,000 mPa·s or less, 7,000 mPa·s or less, or 6,000 mPa·s or less, or can be 500 mPa·s or more, 1,000 mPa·s or more, 1,500 mPa·s or more, 2,000 mPa·s or more, or 2,500 mPa·s or more.

[0101] <<Method for Preparing Oil-in-Water Emulsion Cosmetic>> There are no particular limitations on the method for preparing the oil-in-water emulsion cosmetic of the present disclosure, and it can be prepared by known methods such as dispersion methods and aggregation methods.

[0102] The dispersion method is a method of mechanically breaking down clumps of the dispersed phase into smaller particles. Specifically, it is a method of emulsifying by utilizing the crushing force of an emulsifier, and an example of such a method is a high-pressure emulsification method in which high shear force is applied using a high-pressure homogenizer.

[0103] The aggregation method is a colloid preparation method that utilizes surface chemical properties, in which a uniformly dissolved state is transformed into a supersaturated state by some means, resulting in the emergence of a dispersed phase. Specific methods known include HLB temperature emulsification, phase inversion emulsification, non-aqueous emulsification, D-phase emulsification, and liquid crystal emulsification.

[0104] Formulation of Oil-in-Water Emulsion Cosmetic There are no particular limitations on the formulation of the oil-in-water emulsion cosmetic of the present disclosure, and examples thereof include liquid, emulsion, cream, gel, spray, and mousse. Here, in the present disclosure, "spray" can include mist-type sprays, aerosol-type sprays, etc.

[0105] <<Uses of Oil-in-Water Emulsion Cosmetics>> The oil-in-water emulsion cosmetic of the present disclosure can be used, for example, as a cosmetic to be applied by spreading it on the skin, etc. Here, cosmetics to be applied to the skin can also include those known as topical skin preparations.

[0106] The product form of the cosmetics of the present disclosure is not particularly limited, but examples thereof include facial cosmetics such as lotion, serum, emulsion, and pack; makeup cosmetics such as foundation, lipstick, and eye shadow; sunscreen cosmetics (sunscreen agents); body cosmetics; hair cosmetics such as hair liquid, hair tonic, hair conditioner, shampoo, rinse, and hair growth agent; ointments, etc.

[0107] The oil-in-water emulsion cosmetic of the present disclosure will be described in more detail below using examples, but the cosmetic of the present disclosure is not limited to these. Note that, hereinafter, unless otherwise specified, the blending amounts are expressed in mass %.

[0108] Examples 1 to 9, Reference Examples 1 and 2, and Comparative Examples 1 to 6 The following tests were conducted on the oil-in-water emulsion cosmetics obtained by the formulations shown in Tables 1 to 4 and the production methods shown below, and the results are shown in Tables 1 to 4. Here, "O / W (aqueous phase)" in the tables refers to an oil-in-water emulsion cosmetic in which particles are contained in the aqueous phase, and "O / W (oil phase)" refers to an oil-in-water emulsion cosmetic in which particles are contained in the oil phase.

[0109] <Evaluation Method> (Rolling Stability Test: Emulsion Stability) The prepared cosmetic was placed in a 50 mL transparent sample tube (diameter 3 cm), and the sample tube was rotated at a speed of 45 rpm in an atmosphere of 25°C for 4 hours, and the state of particle aggregation was visually observed and evaluated according to the following criteria, where A to C grades can be considered as passing, and D grade as failing.

[0110] A: No color stripes associated with particle agglomerates were observed. B: Color stripes associated with particle agglomerates were only slightly observed. C: Color stripes associated with particle agglomerates were only slightly observed. D: Color stripes associated with particle agglomerates were clearly observed.

[0111] (Tone-up Evaluation Test) The prepared cosmetic was applied to the arm, the moisture was dried, the applied surface of the cosmetic was visually observed, and the state of tone-up was evaluated according to the following criteria. Here, ratings A to B can be considered as passing, and ratings C to D as failing. In addition to the tone-up effect, this tone-up test can also indirectly evaluate whether particles such as pigment-grade hydrophobic treated particles have been applied evenly to the skin surface. That is, it can be said that particles such as pigment-grade hydrophobic treated particles have been applied evenly to the skin surface in the order of D, C, B, and A.

[0112] A: There was no unevenness in brightness, and an excellent tone-up effect was achieved. B: There was very slight unevenness in brightness, but a good tone-up effect was achieved. C: There was slight unevenness in brightness, and a good tone-up effect was not achieved. D: There was obvious unevenness in brightness, and a good tone-up effect was not achieved.

[0113] (Evaluation test of particle dispersibility) The prepared cosmetic was placed in a 50 mL transparent sample tube (diameter 3 cm), and after storage at 25°C for 7 days, the state of particle dispersion was visually observed and evaluated according to the following criteria.

[0114] A: No sediment of pigment-grade hydrophobic treated particles was observed. B: A very slight sediment of pigment-grade hydrophobic treated particles was observed. C: A slight sediment of pigment-grade hydrophobic treated particles was observed. D: A clear sediment of pigment-grade hydrophobic treated particles was observed.

[0115] (Evaluation Test for Usability) Three expert panelists comprehensively evaluated the usability (stickiness) of each cosmetic when it was directly applied to the face, using the following evaluation criteria.

[0116] A: No stickiness felt. B: Almost no stickiness felt. C: Slight stickiness felt. D: Stickiness felt.

[0117] (Evaluation of Viscosity) The viscosity of the cosmetic preparations one day after preparation was evaluated using a B-type viscometer (TVB-type viscometer TVB-10, manufactured by Toki Sangyo Co., Ltd.) under conditions of rotor number 4, 30°C, and 12 rpm, and the viscosity of the cosmetic preparations four weeks after preparation was evaluated under conditions of rotor number 4, 0°C, 25°C, or 50°C, and 12 rpm.

[0118] <Method for producing cosmetics> Oil-in-water emulsion cosmetics were produced by the following method using the formulations shown in Tables 1 to 4. Here, the numbers shown below correspond to the numbers on the left side indicating the names of the ingredients in the formulations in Tables 1 to 4.

[0119] Example 1 Materials No. 2, No. 3, No. 5 to No. 12, and No. 18 were added to a portion of the ion-exchanged water No. 1 and mixed uniformly to obtain an aqueous phase part.

[0120] Materials Nos. 29 to 32, 34 to 36, 38, 39, 42, and 43 were uniformly mixed to obtain an oil phase part.

[0121] The remaining ion-exchanged water from No. 1 was mixed uniformly with the materials from No. 21 to No. 23 to obtain powder parts.

[0122] The oil phase part was gradually added to the aqueous phase part, and then the powder part was gradually added, and the mixture was uniformly dispersed using a homomixer to obtain the oil-in-water emulsion cosmetic of Example 1.

[0123] Examples 2 to 7 Oil-in-water emulsion cosmetics of Examples 2 to 7 were obtained in the same manner as in Example 1, except that the formulations were changed as shown in Tables 1 and 2.

[0124] Example 8 Materials No. 2, No. 4, No. 8 to No. 11, and No. 14 to No. 18 were added to a portion of the ion-exchanged water No. 1 and mixed uniformly to obtain an aqueous phase part.

[0125] Materials No. 29, No. 31, No. 33 to No. 37, No. 39 to No. 41, and No. 43 were uniformly mixed to obtain an oil phase part.

[0126] The remaining ion-exchanged water from No. 1 was mixed uniformly with the materials from No. 19, No. 22, and No. 23 to obtain powder parts.

[0127] The oil phase part was gradually added to the aqueous phase part, and then the powder part was gradually added, and the mixture was uniformly dispersed using a homomixer to obtain the oil-in-water emulsion cosmetic of Example 8.

[0128] Example 9 An oil-in-water emulsion cosmetic of Example 9 was obtained in the same manner as in Example 8, except that the formulation was changed as shown in Table 2.

[0129] (Reference Example 1) Except for not using a whitening agent or an anti-inflammatory agent, an oil-in-water emulsion cosmetic of Reference Example 1 was obtained in the same manner as in Example 1. Note that this cosmetic was in a cream form and could not be subjected to a rolling stability test, so it was designated as a Reference Example.

[0130] (Reference Example 2) An oil-in-water emulsion cosmetic of Reference Example 2 was obtained in the same manner as in Example 2, except that a whitening agent and an anti-inflammatory agent were not used. This cosmetic also had a creamy form, and the rolling stability test could not be carried out, so it was designated as a Reference Example.

[0131] Comparative Example 1 An oil-in-water emulsion cosmetic of Comparative Example 1 was obtained in the same manner as in Example 1, except that untreated polymer particles (hydrophobic) were used instead of the pigment-grade hydrophobic treated particles.

[0132] Comparative Example 2 An oil-in-water emulsion cosmetic of Comparative Example 2 was obtained in the same manner as in Example 1, except that hydrophobized fine particles having a particle size smaller than that of pigment-grade hydrophobized particles were used instead of the pigment-grade hydrophobized particles.

[0133] Comparative Example 3 An oil-in-water emulsion cosmetic of Comparative Example 3 was obtained in the same manner as in Example 1, except that untreated pigment-grade particles (hydrophilic) were used instead of the pigment-grade hydrophobized particles.

[0134] Comparative Example 4 Materials No. 2, No. 3, No. 5 to No. 13, and No. 18 were added to ion-exchanged water No. 1 and mixed uniformly to obtain an aqueous phase part.

[0135] Materials Nos. 29 to 32, Nos. 34 to 36, No. 38, No. 39, and Nos. 42 and 43 were uniformly mixed to obtain an oil phase part.

[0136] The material of No. 44 was gradually added to the oil phase part to prepare a mixed liquid. Next, this mixed liquid was gradually added to the aqueous phase part, and the mixture was uniformly dispersed using a homomixer to obtain the oil-in-water emulsion cosmetic of Comparative Example 4.

[0137] (Comparative Example 5) An oil-in-water emulsion cosmetic of Comparative Example 5 was obtained in the same manner as in Comparative Example 3, except that the whitening agent and anti-inflammatory agent were not used. This cosmetic was in a creamy form and could not be subjected to a rolling stability test, but the tone-up ability was evaluated as D, so it was selected as a comparative example.

[0138] (Comparative Example 6) An oil-in-water emulsion cosmetic of Comparative Example 6 was obtained in the same manner as in Comparative Example 4, except that the whitening agent and anti-inflammatory agent were not used. This cosmetic also had a creamy form and could not be subjected to the rolling stability test, but the tone-up effect was evaluated as D, so it was selected as a comparative example.

[0139]

[0140]

[0141]

[0142]

[0143] <Results> From the results in Tables 1 to 4, it was confirmed that the oil-in-water emulsion cosmetics of Examples 1 to 9, which contained pigment-grade hydrophobized particles and a salt-type or acid-type whitening agent and / or anti-inflammatory agent, were excellent in emulsion stability and tone-up effect.

[0144] Furthermore, the results of Examples 1 and 2 and Examples 3 to 9 show that when a polyether-modified silicone with an HLB of more than 10.0 is included, emulsion stability and tone-up properties are further improved.

[0145] <<Formulation Examples of Oil-in-Water Emulsion Cosmetics>> Formulation examples of oil-in-water emulsion cosmetics according to the present disclosure are given below, but the present invention is not limited to these examples. The numbers shown below correspond to the numbers on the left side indicating the names of ingredients in the formulations in Table 5. All of the obtained cosmetics were excellent in emulsion stability and tone-up effect.

[0146] Formulation Example 1: Materials No. 2, No. 17, No. 18, No. 20, No. 21, Nos. 27 to 29, and No. 31 were added to a portion of the ion-exchanged water No. 1 and mixed uniformly to obtain an aqueous phase part.

[0147] Materials Nos. 45 to 51 and Nos. 62 to 67 were mixed uniformly to obtain oil phase parts.

[0148] The remaining ion-exchanged water from No. 1 was uniformly mixed with the materials from No. 39 to No. 41 and No. 44 to obtain powder parts.

[0149] The oil phase part was gradually added to the aqueous phase part, and then the powder part was gradually added, and the mixture was uniformly dispersed using a homomixer to obtain a creamy oil-in-water emulsion cosmetic of Formulation Example 1.

[0150] Formulation Example 2 A creamy oil-in-water emulsion cosmetic of Formulation Example 2 was obtained in the same manner as Formulation Example 1, except that the pigment-grade hydrophobic treated particles were changed to No. 42 particles.

[0151] Formulation Example 3 A cream-like oil-in-water emulsion cosmetic of Formulation Example 3 was obtained in the same manner as Formulation Example 1, except that the material of No. 3 was also added to the aqueous phase part.

[0152] Formulation Example 4 A creamy oil-in-water emulsion cosmetic of Formulation Example 4 was obtained in the same manner as Formulation Example 3, except that the pigment-grade hydrophobic treated particles were changed to No. 43 particles.

[0153] Formulation Example 5: Materials Nos. 2 to 17, 19 to 28, 30, and 32 to 38 were added to a portion of the ion-exchanged water No. 1 and mixed uniformly to obtain an aqueous phase part.

[0154] Materials Nos. 52 to 61 and No. 63 were mixed uniformly to obtain an oil phase part.

[0155] The remaining ion-exchanged water from No. 1 was uniformly mixed with the materials from No. 39 to No. 41 and No. 44 to obtain powder parts.

[0156] The oil phase part was gradually added to the aqueous phase part, and then the powder part was gradually added, and the mixture was dispersed uniformly using a homomixer to obtain a creamy oil-in-water emulsion cosmetic of Formulation Example 5.

[0157]

[0158] 20 Pigment-grade hydrophobic treated particles 30 Water 40 Oil

Claims

1. A dispersion medium containing water, and Oil droplets dispersed in the dispersion medium An oil-in-water emulsion cosmetic comprising: the dispersion medium contains at least one selected from the group consisting of a whitening agent and an anti-inflammatory agent, and pigment-grade hydrophobized particles, The whitening agent includes at least one selected from the group consisting of salt-type whitening agents and acid-type whitening agents, The anti-inflammatory agent includes at least one selected from the group consisting of salt-type anti-inflammatory agents and acid-type anti-inflammatory agents. Oil-in-water emulsion cosmetic.

2. The cosmetic preparation according to claim 1 , wherein the oil droplets contain a nonionic surfactant.

3. The cosmetic preparation according to claim 1 or 2, wherein the oil droplets contain a higher alcohol.

4. The cosmetic preparation according to claim 1 or 2, wherein the dispersion medium comprises a polyether-modified silicone having an HLB of more than 10.0 and not more than 18.

0.

5. 5. The cosmetic preparation according to claim 4, wherein a mass ratio of said pigment-grade hydrophobized particles to said polyether-modified silicone is 10 or more.

6. 3. The cosmetic preparation according to claim 1, wherein the salt-type whitening agent is at least one selected from the group consisting of ascorbic acid, tranexamic acid, glycyrrhizic acid, nicotinic acid, kojic acid, ellagic acid, 1-piperidinepropionic acid, 3-O-ethyl-L-ascorbic acid, and alkoxysalicylic acid, and the acid-type whitening agent is at least one selected from the group consisting of ascorbic acid, tranexamic acid, glycyrrhizic acid, nicotinic acid, kojic acid, ellagic acid, 1-piperidinepropionic acid, 3-O-ethyl-L-ascorbic acid, and alkoxysalicylic acid.

7. 3. The cosmetic preparation according to claim 1, wherein the anti-inflammatory agent is at least one selected from the group consisting of magnesium ascorbyl phosphate, dipotassium glycyrrhizinate, and ammonium glycyrrhizinate.

8. 3. The cosmetic preparation according to claim 1, wherein at least one selected from the group consisting of the salt-type whitening agent, the acid-type whitening agent, the salt-type anti-inflammatory agent, and the acid-type anti-inflammatory agent is contained in an amount of 50 mass% or more based on the total amount of the whitening agent component and the anti-inflammatory agent component.

9. 3. The cosmetic preparation according to claim 1, wherein the pigment-grade hydrophobized particles have an average particle size of 250 nm or more.

10. The cosmetic preparation according to claim 1 or 2, wherein the content of the thickener is 1% by mass or less.