Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/04—Dispersions; Emulsions
  • A61K8/06—Emulsions
  • A61K8/062—Oil-in-water emulsions
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/04—Dispersions; Emulsions
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
  • A61K8/27—Zinc; Compounds thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
  • A61K8/29—Titanium; Compounds thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
  • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
  • A61K8/37—Esters of carboxylic acids
  • A61K8/375—Esters of carboxylic acids the alcohol moiety containing more than one hydroxy group
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
  • A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • A61K8/8158—Homopolymers or copolymers of amides or imides, e.g. (meth) acrylamide; Compositions of derivatives of such polymers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
  • A61K8/85—Polyesters
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
  • A61Q17/04—Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
  • A61K2800/60—Particulates further characterized by their structure or composition
  • A61K2800/61—Surface treated
  • A61K2800/62—Coated
  • A61K2800/623—Coating mediated by organosilicone compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
  • A61K2800/60—Particulates further characterized by their structure or composition
  • A61K2800/65—Characterized by the composition of the particulate/core
  • A61K2800/651—The particulate/core comprising inorganic material

Definitions

• the present invention relates to an oil-in-water emulsion cosmetic.
• ultraviolet scattering agents and ultraviolet absorbing agents are used to enhance the ultraviolet protection effect, and in particular, metal oxide powders such as titanium oxide and zinc oxide are used as ultraviolet scattering agents.
• metal oxide powders such as titanium oxide and zinc oxide are used as ultraviolet scattering agents.
• Patent Document 1 describes an oil-in-water emulsion cosmetic that contains fine metal oxide particles whose surfaces are coated with trialkoxyalkylsilane or alkyl titanate, polyhydroxystearic acid, a partially crosslinked alkyl-modified and/or phenyl-modified organopolysiloxane polymer, and a (sodium acrylate/sodium acryloyldimethyltaurate) copolymer, for the purpose of providing an oil-in-water emulsion cosmetic that is excellent in freshness during use while also exhibiting sufficient water resistance.
• the oil-in-water composition contains one or more selected from the group consisting of acrylic acid / alkyl methacrylate copolymer, (acrylates / beheneth methacrylate) copolymer, and (Na acrylate / Na acryloyldimethyl taurate) copolymer, hydrophobized titanium oxide, polyhydroxystearic acid, N-stearoyl-N-methyl taurine salt, polyoxyalkylene alkyl ether phosphoric acid or a salt thereof, an oil-soluble ultraviolet absorber that is solid at 25 ° C., and ethylhexyl methoxycinnamate, and the content of hydrophobized titanium oxide is 5 to 15% by mass, and the content mass mass
• Patent Document 3 describes a fine particle metal oxide dispersion composition that contains a fine particle metal oxide that has been surface-treated with an alkyl titanate, polyhydroxystearic acid, and a non-silicone-based oil agent, for the purpose of providing a fine particle metal oxide dispersion composition that has excellent dispersibility and stability over time, is non-sticky, and has good usability in terms of spreadability.
• the present invention comprises the following components (A), (B), (C), and (D): (A) an acrylamide polymer; (B) a hydrophobically treated fine metal oxide particle; (C) at least one member selected from the group consisting of dipentaerythrityl tri-polyhydroxystearate and polyhydroxystearic acid; and (D) a liquid oil,
• the content of component (A) is 0.6% by mass or more and 1.5% by mass or less
• the content of component (C) is 0.2% by mass or more and 5% by mass or less
• the present invention relates to an oil-in-water emulsion cosmetic, in which the content of a surfactant other than component (C) as component (E) is less than 1 mass %.
• Patent Documents 2 and 3 may not have sufficient emulsion stability, may cause stickiness after application to the skin, may not be sufficiently moist, and may cause makeup to smudge when a makeup base or foundation is applied on top of them.
• the present invention relates to an oil-in-water emulsion cosmetic which has excellent emulsion stability, forms a cosmetic coating film capable of suppressing outflow of an ultraviolet protection component into water, and can maintain an excellent ultraviolet protection effect, and furthermore is less sticky even after application, has a good fresh feeling, and suppresses makeup smudging.
• an oil-in-water emulsion cosmetic which contains an acrylamide polymer, a hydrophobically treated fine particle metal oxide, one or more selected from the group consisting of dipentaerythrityl tri-polyhydroxystearate and polyhydroxystearic acid, and a liquid oil, and in which the content of the acrylamide polymer and the content of one or more selected from the group consisting of dipentaerythrityl tri-polyhydroxystearate and polyhydroxystearic acid are within a specified range, and the content of surfactants other than dipentaerythrityl tri-polyhydroxystearate and polyhydroxystearic acid is less than a specified value, thereby forming a cosmetic coating film which has excellent emulsion stability and is capable of suppressing the outflow of UV protection ingredients into water, thereby maintaining a good UV protection effect, and further which is less sticky after application, has a good moist feeling, and is suppressed from causing makeup to smudge.
• the present invention relates to a composition
• a composition comprising the following components (A), (B), (C), and (D): (A) an acrylamide polymer; (B) a hydrophobically treated fine metal oxide particle; (C) at least one member selected from the group consisting of dipentaerythrityl tri-polyhydroxystearate and polyhydroxystearic acid; and (D) a liquid oil,
• the content of component (A) is 0.6% by mass or more and 1.5% by mass or less
• the content of component (C) is 0.2% by mass or more and 5% by mass or less
• the present invention relates to an oil-in-water emulsion cosmetic, in which the content of a surfactant other than component (C) as component (E) is less than 1 mass %.
• the present invention provides an oil-in-water emulsion cosmetic that has excellent emulsion stability, forms a cosmetic coating film that can prevent UV protection ingredients from leaking into water, and can maintain UV protection effects well, and is less sticky after application, has a good fresh feeling, and prevents makeup from smudging.
• oil-in-water emulsion cosmetic comprises the following components (A), (B), (C), and (D): (A) an acrylamide polymer; (B) a hydrophobically treated fine metal oxide particle; (C) at least one member selected from the group consisting of dipentaerythrityl tri-polyhydroxystearate and polyhydroxystearic acid; and (D) a liquid oil,
• the content of component (A) is 0.6% by mass or more and 1.5% by mass or less
• the content of component (C) is 0.2% by mass or more and 5% by mass or less
• the content of surfactants other than component (C) as component (E) is less than 1 mass %.
• “comprising component X” or “containing component X” also means “comprising component X blended therein.”
• liquid refers to a state that has fluidity under an environment of 1 atmosphere and 25°C, that is, a state under temperature conditions above the melting point (a state under temperature conditions above the melting point for amorphous substances that do not have a melting point).
• solid refers to a state that does not have fluidity under an environment of 1 atmosphere and 25°C, that is, a state under temperature conditions below the melting point (a state under temperature conditions below the melting point for amorphous substances that do not have a melting point).
• the emulsion cosmetic of the present invention has excellent emulsion stability, forms a cosmetic coating film that can prevent the UV protection component from escaping into water, and can maintain the UV protection effect well, and furthermore, even after application, it is less sticky, has a good fresh feeling, and can prevent the makeup from smudging.
• the reason for this is unclear, but it is thought to be as follows.
• the surface of the fine metal oxide is hydrophobized, and an acrylamide polymer is used as a thickener for thickening the aqueous phase, which is a continuous phase, and the content of the acrylamide polymer is within a predetermined range, so that when the fine metal oxide is applied to an oil-in-water emulsion cosmetic, the fine metal oxide can be stably present in the oil phase, improving emulsion stability, and furthermore, even after application, the fine metal oxide can be less sticky, has good moisture, and can suppress makeup smudging.
• the content of one or more selected from the group consisting of dipentaerythrityl tripolyhydroxystearate and polyhydroxystearic acid is within a predetermined range, and the content of surfactants other than dipentaerythrityl tripolyhydroxystearate and polyhydroxystearic acid is less than a predetermined value, so that even if the cosmetic coating film on the skin surface is wetted with
• the emulsion cosmetic of the present invention contains an acrylamide polymer as component (A) from the viewpoints of thickening the aqueous phase, which is the continuous phase, and allowing the fine particle metal oxide to be stably present in the oil phase to improve emulsion stability, as well as from the viewpoints of reducing stickiness after application, improving moisture and freshness, and preventing makeup from smudging.
• component (A) may be used alone or in combination of two or more.
• component (A) preferably contains one or more structural units derived from an acrylamide monomer selected from the group consisting of acrylamide and acryloyldimethyltaurate (hereinafter also referred to as "AMPS"); more preferably, it is one or more selected from the group consisting of a homopolymer of acrylamide, a homopolymer of AMPS and a salt thereof, and a copolymer containing structural units derived from one or more acrylamide monomers selected from the group consisting of acrylamide and AMPS, and a salt thereof; and even more preferably, it is one or more selected from the group consisting of a homopolymer of acrylamide, and a copolymer containing structural units derived from one or more acrylamide monomers selected from the group consisting of acrylamide and AMPS, and a salt thereof.
• AMPS acryloyldimethyltaurate
• component (A) include one or more selected from the group consisting of polyacrylamide, (acrylic acid/acrylamide) copolymer, (acrylic acid/AMPS) copolymer, (dimethylacrylamide/AMPS) copolymer, (acrylic acid/AMPS/dimethylacrylamide) copolymer, (hydroxyethyl acrylate/AMPS) copolymer, (AMPS/vinylpyrrolidone) copolymer, (AMPS/vinylformamide) copolymer, (AMPS/polyoxyethylene alkyl ester of methacrylic acid (average number of moles of ethylene oxide added: 10 to 30)) copolymer, and salts thereof.
• polyacrylamide polyacrylamide
• (acrylic acid/acrylamide) copolymer (acrylic acid/AMPS) copolymer, (dimethylacrylamide/AMPS) copolymer, (acrylic acid/AMPS/dimethylacrylamide) copolymer, (hydroxyethyl acrylate
• copolymer and salts thereof include (hydroxyethyl acrylate/sodium acryloyldimethyl taurate) copolymer (INCI name: Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer), (sodium acrylate/sodium acryloyldimethyl taurate) copolymer (INCI name: Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer), (sodium acrylate/acryloyldimethyl taurate/dimethylacrylamide) crosspolymer (INCI name: Sodium Acrylate/Acryloyldimethyltaurate/Dimethylacrylamide Crosspolymer), (ammonium acryloyldimethyltaurate/vinylpyrrolidone) copolymer (INCI name: Ammonium Acryloyldimethyltaurate/VP
• crosspolymers include acrylic acid/acrylic acid amide/
• component (A) Commercially available products containing component (A) include, for example, "SEPIGEL 501” (polyacrylamide, polysorbate 85, mineral oil, isoparaffin), “SEPIGEL 305" (polyacrylamide, hydrogenated polyisobutene (or (C13,14) isoparaffin), laureth-7, water) (polyacrylamide content: 40.0% by mass), “SIMULGEL EG” ((sodium acrylate/sodium acryloyldimethyltaurate) copolymer, isohexadecane, polysorbate 80, water, sorbitan oleate) ((acryloyldimethyltaurate) Content of (hydroxyethyl acrylate/sodium acryloyldimethyl taurate) copolymer: 37.5% by mass), “SEPIMAX ZEN” (polyacrylate crosspolymer-6, t-butanol), “SEPINOV EMT 10" ((hydroxyeth
• component (A) are more preferably one or more selected from the group consisting of (sodium acrylate/sodium acryloyldimethyltaurate) copolymer, (hydroxyethyl acrylate/sodium acryloyldimethyltaurate) copolymer, (ammonium acryloyldimethyltaurate/vinylpyrrolidone) copolymer, and polyacrylamide, from the viewpoints of thickening the aqueous phase, which is the continuous phase, and allowing the fine particle metal oxide to exist stably in the oil phase, thereby improving emulsion stability, as well as reducing stickiness after application, improving moisture, and preventing makeup from smudging.
• the content of component (A) in the total amount of the emulsified cosmetic of the present invention is 0.6% by mass or more, preferably 0.7% by mass or more, more preferably 0.8% by mass or more, from the viewpoint of thickening the aqueous phase, which is the continuous phase, and allowing the fine metal oxide particles to be stably present in the oil phase to improve emulsion stability, and is 1.5% by mass or less, preferably 1.3% by mass or less, more preferably 1.1% by mass or less, even more preferably 1.0% by mass or less, and even more preferably 0.9% by mass or less, from the viewpoint of reducing stickiness after application, improving moisture, and preventing makeup from smudging. More specifically, it is preferably 0.6 to 1.3% by mass, more preferably 0.6 to 1.1% by mass, even more preferably 0.6 to 1.0% by mass, even more preferably 0.7 to 1.0% by mass, and even more preferably 0.8 to 0.9% by mass.
• the emulsion cosmetic of the present invention contains, as component (B), fine particles of a hydrophobically treated metal oxide, from the viewpoint of absorbing or scattering ultraviolet rays and improving the ultraviolet protection effect.
• component (B) may be used alone or in combination of two or more.
• the fine metal oxide of component (B) is preferably one or more selected from the group consisting of fine zinc oxide, fine titanium oxide, and fine cerium oxide, and more preferably one or more selected from the group consisting of fine zinc oxide and fine titanium oxide.
• these fine metal oxides can contain divalent or higher metals, and metals such as iron, zirconium, calcium, manganese, magnesium, yttrium, etc. or their oxides can be contained alone or in appropriate combination of two or more in the fine metal oxide.
• hydrophobization treatment of component (B) examples include silicone treatment; alkylalkoxysilane treatment; fatty acid treatment; fluorine-containing compound treatment such as perfluoroalkyl phosphate ester, perfluoroalcohol, etc.; amino acid treatment such as N-acylglutamic acid, etc.; lecithin treatment; metal soap treatment; alkyl phosphate ester treatment; and ASI treatment using N-acylamino acid metal salt (sodium lauroyl aspartate), zinc chloride, and alkoxytitanium alkylate (isopropyl titanium triisostearate). These surface treatments may be used alone or in combination of two or more.
• the hydrophobization treatment of component (B) is preferably one or more treatments selected from the group consisting of silicone treatment, alkylalkoxysilane treatment, and fatty acid treatment, from the viewpoints of increasing the dispersibility of component (B) in the oil-in-water emulsion cosmetic and improving the UV protection effect and emulsion stability, as well as reducing stickiness after application, improving moisture, and preventing makeup from smudging.
• Silicone oils such as methylpolysiloxane, dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane, methylhydrogenpolysiloxane (methicone), dimethylsiloxane/methylhydrogensiloxane copolymer (hydrogen dimethicone), methylcyclopolysiloxane, dodecamethylcyclohexasiloxane, tetradecamethylhexasiloxane, dimethylsiloxane/methyl(polyoxyethylene)siloxane/methyl(polyoxypropylene)siloxane copolymer, dimethylsiloxane/methyl(polyoxyethylene)siloxane copolymer, dimethylsiloxane/methyl(polyoxypropylene)siloxane copolymer, dimethylsiloxane/methylcetyloxysiloxane copolymer,
• the surface treatment agent used in the silicone treatment is preferably one or more selected from the group consisting of dimethylpolysiloxane (dimethicone), methylhydrogenpolysiloxane (methicone), and dimethylsiloxane/methylhydrogensiloxane copolymer (hydrogen dimethicone), more preferably one or more selected from the group consisting of dimethylpolysiloxane (dimethicone) and methylhydrogenpolysiloxane (methicone), from the viewpoints of increasing the dispersibility of component (B) in the oil-in-water emulsion cosmetic, improving the UV protection effect and emulsion stability, as well as reducing stickiness after application, improving moisture, and preventing makeup from smudging.
• the surface treatment agent used in the alkylalkoxysilane treatment is preferably an alkylalkoxysilane having a straight or branched alkyl group having 6 to 20 carbon atoms, more preferably one or more selected from the group consisting of octyltriethoxysilane (triethoxycaprylylsilane) and octyltrimethoxysilane (trimethoxycaprylylsilane), and even more preferably octyltriethoxysilane (triethoxycaprylylsilane), from the viewpoints of increasing the dispersibility of component (B) in the oil-in-water emulsion cosmetic, improving the UV protection effect and emulsion stability, as well as reducing stickiness after application, improving moisture, and preventing makeup from smudging.
• Surface treatment agents used in the fatty acid treatment include linear or branched higher fatty acids having 12 to 22 carbon atoms.
• the surface treatment agent used in the fatty acid treatment is preferably a linear or branched higher fatty acid having 14 to 22 carbon atoms, more preferably a linear or branched higher fatty acid having 16 to 20 carbon atoms, and even more preferably one or more selected from the group consisting of stearic acid and isostearic acid, from the viewpoints of increasing the dispersibility of component (B) in the oil-in-water emulsion cosmetic, improving the UV protection effect and emulsion stability, reducing stickiness after application, improving the freshness, and preventing makeup from smudging.
• the hydrophobization treatment of component (B) is more preferably one or more selected from the group consisting of dimethylpolysiloxane (dimethicone), methylhydrogenpolysiloxane (methicone), and dimethylsiloxane/methylhydrogensiloxane copolymer (hydrogen dimethicone) as a surface treatment agent; alkylalkoxysilane treatment using an alkylalkoxysilane having a linear or branched alkyl group with 6 to 20 carbon atoms as a surface treatment agent; and fatty acid treatment using a linear or branched higher fatty acid with 14 to 22 carbon atoms as a surface treatment agent.
• the above-mentioned surface treatment agents may be used alone or in combination of two or more.
• a treatment agent such as silica, hydrous silica, or a hydrous oxide of a metal such as aluminum may be used in combination with the surface treatment agent used in the hydrophobization treatment described above.
• the amount of the hydrophobization treatment in component (B) is, from the viewpoints of increasing the dispersibility of component (B) in the oil-in-water emulsion cosmetic and improving the UV protection effect and emulsion stability, as well as reducing stickiness after application, improving the moisture, and preventing makeup from smudging, preferably 0.1% by mass or more and preferably 40% by mass or less, and more preferably 30% by mass or less of component (B).
• the mass of component (B) and the average primary particle size described below mean the mass and average primary particle size including the surface treatment agent.
• the shape of component (B) may be, for example, spherical, flake, plate, rod, spindle, needle, or irregular, but any shape can be used.
• the average primary particle diameter of component (B) is, from the viewpoint of improving the UV protection effect and emulsion stability, preferably 1 ⁇ m or less, more preferably 800 nm or less, even more preferably 500 nm or less, still more preferably 300 nm or less, still more preferably 200 nm or less, still more preferably 100 nm or less, still more preferably 90 nm or less, still more preferably 50 nm or less, still more preferably 40 nm or less, still more preferably 30 nm or less, and still more preferably 25 nm or less, and from the viewpoint of versatility, preferably 1 nm or more, more preferably 3 nm or more, and still more preferably 5 nm or more.
• the average primary particle diameter of component (B) is preferably 1 nm to 1 ⁇ m, more preferably 1 to 800 nm, even more preferably 3 to 500 nm, still more preferably 5 to 300 nm, still more preferably 5 to 200 nm, still more preferably 5 to 100 nm, still more preferably 5 to 90 nm, still more preferably 5 to 50 nm, still more preferably 5 to 40 nm, still more preferably 5 to 30 nm, and still more preferably 5 to 25 nm.
• the average primary particle size of component (B) in the present invention can be determined from an image observed with a transmission electron microscope (TEM). Specifically, the TEM is used to observe at a magnification of 50,000 times, the maximum short diameter of 300 primary particles in the observed image is measured, and the number average value is calculated.
• the maximum short diameter means the short diameter having the greatest length among the short diameters perpendicular to the long diameter, when component (B) has a shape other than a flaky or plate-like shape.
• the thickness of 300 primary particles in the observed image observed under the same conditions as above is measured, and the number average value is calculated. Specifically, it is measured by the method described in the examples.
• Component (B) can be prepared by a known method using the above-mentioned surface treatment agent from fine metal oxide particles before hydrophobization treatment as component (B').
• the surface treatment using the silicone oil can be prepared by coating fine metal oxide particles such as fine zinc oxide particles with at least one silicone compound (excluding silane compounds) composed of organopolysiloxanes and silicone resins in a non-gas phase state, and then baking at a temperature of 600 to 950 ° C. in an oxygen-containing atmosphere to coat the surface of the fine metal oxide particles with silicon oxide.
• silicone compound excluding silane compounds
• the surface treatment using the alkylalkoxysilane can be prepared by coating fine metal oxide particles with a specific polysiloxane compound, and then surface treating the surface with the alkylalkoxysilane in water.
• the preferred embodiment and measuring method of the average primary particle size of component (B') (fine particle metal oxide before hydrophobization treatment) used in the above-mentioned hydrophobization treatment are the same as the preferred embodiment and measuring method of component (B).
• hydrophobically treated zinc oxide particles include the FINEX series (manufactured by Sakai Chemical Industry Co., Ltd.), the MZ series, and the MZY series (all manufactured by Teika Corporation).
• hydrophobically treated titanium dioxide particles include the STR series (manufactured by Sakai Chemical Industry Co., Ltd.), the TTO-55 series, the TTO-51 series (all manufactured by Ishihara Sangyo Kaisha, Ltd.), the MT series, and the MTY series (all manufactured by Teika Corporation).
• the content of component (B) in the total amount of the emulsified cosmetic of the present invention is, from the viewpoints of improving the UV protection effect, improving emulsion stability, reducing stickiness after application, and improving the freshness, preferably 3% by mass or more, more preferably 4% by mass or more, even more preferably 5% by mass or more, even more preferably 7% by mass or more, and even more preferably 10% by mass or more, and from the viewpoints of improving emulsion stability, reducing stickiness after application, and improving the freshness, preferably 30% by mass or less, more preferably 27% by mass or less, even more preferably 25% by mass or less, even more preferably 20% by mass or less, and even more preferably 15% by mass or less.
• the content is preferably 3 to 30% by mass, more preferably 3 to 27% by mass, even more preferably 3 to 25% by mass, even more preferably 3 to 20% by mass, even more preferably 3 to 15% by mass, even more preferably 4 to 15% by mass, even more preferably 5 to 15% by mass, even more preferably 7 to 15% by mass, and even more preferably 10 to 15% by mass.
• the emulsion cosmetic of the present invention contains, as component (C), one or more components selected from the group consisting of dipentaerythrityl tri-polyhydroxystearate and polyhydroxystearic acid, from the viewpoints of forming a cosmetic coating film that can prevent the outflow of UV protection ingredients into water, thereby favorably maintaining the UV protection effect, and from the viewpoints of preventing the makeup from smudging.
• component (C) dipentaerythrityl tri-polyhydroxystearate and polyhydroxystearic acid may be used alone, or dipentaerythrityl tri-polyhydroxystearate and polyhydroxystearic acid may be used in combination.
• Polyhydroxystearic acid is a polymer of hydroxystearic acid. Hydroxystearic acid has one hydroxy group in the molecule, and the polymerization reaction of hydroxystearic acid is a reaction in which a hydroxy group or a carboxy group in a hydroxystearic acid molecule is esterified with a carboxy group or a hydroxy group in another hydroxystearic acid molecule, i.e., an intermolecular esterification reaction.
• the polyhydroxystearic acid may be a polymer of 12-hydroxystearic acid.
• the average degree of polymerization of the 12-hydroxystearic acid polymer is preferably 2 or more and 12 or less, more preferably 3 or more and 12 or less, and even more preferably 4 or more and 12 or less.
• An example of a commercially available product of polyhydroxystearic acid is "Salacos HS-6C" (manufactured by Nisshin Oillio Group, Ltd.).
• the content of component (C) in the total amount of the emulsified cosmetic of the present invention is 0.2% by mass or more, preferably 0.3% by mass or more, more preferably 0.5% by mass or more, and even more preferably 0.7% by mass or more, from the viewpoint of forming a cosmetic coating film that can prevent the outflow of UV protection ingredients into water and thereby maintain the UV protection effect well, and from the viewpoint of preventing the makeup from smudging, and from the viewpoint of reducing stickiness after application and improving the freshness, it is 5% by mass or less, preferably 4% by mass or less, more preferably 3% by mass or less, and even more preferably 2% by mass or less.
• the content is preferably 0.2 to 4% by mass, more preferably 0.2 to 3% by mass, even more preferably 0.3 to 3% by mass, even more preferably 0.5 to 3% by mass, even more preferably 0.7 to 3% by mass, and even more preferably 0.7 to 2% by mass.
• the mass ratio of the content of component (B) to the content of component (C) in the total amount of the emulsion cosmetic of the present invention is, from the viewpoint of forming a cosmetic coating film that can prevent the outflow of UV protection ingredients into water and thereby maintain the UV protection effect well, and from the viewpoint of preventing the makeup from smudging, preferably 0.5 or more, more preferably 1 or more, even more preferably 2 or more, even more preferably 3 or more, even more preferably 4 or more, and even more preferably 5 or more, and from the same viewpoints as above, is preferably 120 or less, more preferably 90 or less, even more preferably 75 or less, even more preferably 60 or less, even more preferably 50 or less, even more preferably 30 or less, even more preferably 20 or less, and even more preferably 15 or less.
• it is preferably 0.5 to 120, more preferably 1 to 90, even more preferably 2 to 90, even more preferably 3 to 75, even more preferably 4 to 75, even more preferably 5 to 75, even more preferably 5 to 60, even more preferably 5 to 50, even more preferably 5 to 30, even more preferably 5 to 20, and even more preferably 5 to 15.
• the mass ratio of the content of component (B) to the combined content of components (A) and (C) in the total amount of the emulsion cosmetic of the present invention is preferably 0.3 or more, more preferably 1.0 or more, even more preferably 1.5 or more, and even more preferably 2.0 or more, from the viewpoints of forming a cosmetic coating film that can prevent the outflow of UV protection components into water and thereby maintain the UV protection effect well, and of preventing the makeup from smudging, and from the same viewpoints as above, is preferably 40 or less, more preferably 30 or less, even more preferably 20 or less, even more preferably 15 or less, even more preferably 13 or less, even more preferably 10 or less, and even more preferably 8.0 or less.
• it is preferably 0.3 to 40, more preferably 1.0 to 40, even more preferably 1.5 to 30, even more preferably 2.0 to 30, even more preferably 2.0 to 20, even more preferably 2.0 to 15, even more preferably 2.0 to 13, even more preferably 2.0 to 10, and even more preferably 2.0 to 8.0.
• the emulsion cosmetic of the present invention contains a liquid oil as component (D) from the viewpoint of incorporating component (B) and improving emulsion stability.
• the component (D) may be used alone or in combination of two or more.
• the emulsion cosmetic of the present invention may contain, as component (D), a liquid water-insoluble organic ultraviolet absorber (D1) (hereinafter also referred to as "component (D1)”), from the viewpoint of further improving the ultraviolet protection effect.
• component (D1) liquid water-insoluble organic ultraviolet absorber
• water-insoluble refers to a solubility in water of 1 w/w % or less.
• liquid organic UV absorbers (D1) include cinnamic acid-based UV absorbers such as 2-ethylhexyl paramethoxycinnamate, 2-ethoxyethyl paramethoxycinnamate, a mixture of isopropyl paramethoxycinnamate and diisopropyl cinnamate, and methyl bis(trimethylsiloxy)silylisopentyl trimethoxycinnamate; paraaminobenzoic acid-based UV absorbers such as amyl paradimethylaminobenzoate and 2-ethylhexyl paradimethylaminobenzoate; salicylic acid-based UV absorbers such as ethylene glycol salicylate, 2-ethylhexyl salicylate, butyloctyl salicylate, benzyl salicylate, and homomenthyl salicylate; octocrylene; dimethicodiethylbenzalmalonate; and copolymers of a
• liquid organic ultraviolet absorbers include, for example, "UVINUL MC80" (2-ethylhexyl paramethoxycinnamate, display name: ethylhexyl methoxycinnamate, manufactured by BASF); "PARSOL 340" (display name: octocrylene, manufactured by DSM Nutrition Japan Co., Ltd.); “PARSOL EHS” (2-ethylhexyl salicylate), “PARSOL HMS” (homomenthyl salicylate), and “PA RSOL SLX” (Polysilicone-15 (INCI name: Polysilicone-15) (dimethicodiethyl benzalmalonate)) (both manufactured by DSM); "Polycrylene” (Polyester-8 (INCI name: Polyester-8) (copolymer of adipic acid and neopentyl glycol with the ends blocked with octyldodecanol or cyanodiphen
• the content of the liquid organic ultraviolet absorber (D1) in the total amount of the emulsion cosmetic of the present invention is, from the viewpoint of improving the ultraviolet protection effect, preferably 0% by mass or more, more preferably 1% by mass or more, even more preferably 3% by mass or more, even more preferably 5% by mass or more, and preferably 15% by mass or less, more preferably 10% by mass or less, even more preferably 8% by mass or less. More specifically, from the same viewpoint as above, it is preferably 0 to 15% by mass, more preferably 1 to 10% by mass, even more preferably 3 to 8% by mass, even more preferably 5 to 8% by mass.
• component (D) preferably contains another liquid oil (D2) (hereinafter also referred to as “component (D2)”) other than the liquid organic ultraviolet absorber (D1).
• component (D2) is not particularly limited as long as it is liquid under an environment of 1 atmospheric pressure and 25°C, and examples of such other liquid oil include oils used in ordinary cosmetics.
• the other liquid oil (D2) is preferably at least one selected from the group consisting of ester oil, silicone oil, hydrocarbon oil, higher alcohol, and higher fatty acid.
• the liquid oil may be contained alone or in appropriate combination of two or more.
• Ester oils include synthetic ester oils and natural fats and oils, such as esters of monocarboxylic acids and monohydric alcohols, esters of monocarboxylic acids and polyhydric alcohols, and esters of polycarboxylic acids and monohydric alcohols.
• Examples of the ester of a monovalent carboxylic acid and a monohydric alcohol include an ester represented by the following general formula (1).
• R 1 -COO-R 2 (1)
• R 1 represents a linear or branched alkyl or alkenyl group having 1 to 25 carbon atoms, or an aromatic hydrocarbon group having 6 to 24 carbon atoms, which may be substituted with a hydroxyl group
• R 2 represents a linear or branched alkyl or alkenyl group having 1 to 30 carbon atoms.
• R 1 is an alkyl group or an alkenyl group
• the number of carbon atoms in R 1 is preferably 7 or more and preferably 23 or less, more preferably 21 or less, even more preferably 19 or less, and still more preferably 17 or less.
• R 1 is an aromatic hydrocarbon group
• the carbon number of R 1 is preferably 6 or more and preferably 22 or less, more preferably 20 or less.
• the number of carbon atoms in R2 is preferably 2 or more, and preferably 28 or less, more preferably 24 or less, even more preferably 22 or less, and still more preferably 20 or less.
• esters represented by general formula (1) include cetyl isooctanoate (cetyl 2-ethylhexanoate), stearyl isooctanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isostearyl laurate, butyl myristate, isopropyl myristate, decyl myristate, isotridecyl myristate, isocetyl myristate, isostearyl myristate, 2-octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, and palmitate.
• oleic acid examples include isostearyl tincture, 2-hexyldecyl palmitate, 2-ethylhexyl stearate, 2-hexyldecyl stearate, isopropyl isostearate, 2-hexyldecyl isostearate, ethyl oleate, isodecyl oleate, oleyl oleate, 2-octyldodecyl oleate, ethyl linoleate, isopropyl linoleate, lanolin acetate, castor oil fatty acid methyl (methyl ricinoleate), and alkyl benzoate (alkyl carbon number 12 to 15).
• Examples of the ester of a monovalent carboxylic acid and a monohydric alcohol include an ester represented by the following general formula (2).
• R3 represents a linear or branched alkyl or alkenyl group having 1 to 25 carbon atoms which may be substituted with a hydroxyl group
• R4 represents an aromatic hydrocarbon group having 6 to 24 carbon atoms
• AO represents an alkyleneoxy group having 2 to 4 carbon atoms
• n represents the average number of moles added of 1 to 50.
• R 3 is preferably an alkyl group having 7 or more carbon atoms and 23 or less, more preferably 21 or less, and even more preferably 19 or less.
• R 4 is preferably an aromatic-containing hydrocarbon group having 6 or more carbon atoms and 22 or less, more preferably 20 or less, even more preferably 18 or less, and still more preferably a benzyl group.
• the alkyleneoxy group represented by AO is preferably a propyleneoxy group, and n is preferably 1 or more and 10 or less, more preferably 1 or more and 5 or less.
• ester represented by the general formula (2) examples include an ester of myristic acid and a 3-mol propylene oxide adduct of benzyl alcohol (Croda: Crodamol STS), an ester of 2-ethylhexanoic acid and a 3-mol propylene oxide adduct of benzyl alcohol (Croda: Crodamol SFX), and the like.
• Examples of the ester of a monovalent carboxylic acid and a polyhydric alcohol include an ester represented by the following general formula (3).
• R5 represents a polyhydric alcohol residue, preferably a hydrocarbon group having 2 to 10 carbon atoms
• R6 represents a monovalent carboxylic acid residue having 1 to 25 carbon atoms
• p represents an integer of 2 to 10.
• R5 may have an ether bond, but is preferably a linear or branched hydrocarbon group having from 2 to 10 carbon atoms.
• p is preferably the same number as the number of hydroxy groups contained in the polyhydric alcohol.
• R6 is an alkyl group having preferably 5 or more, more preferably 7 or more, and from the same viewpoint as above, preferably 23 or less, more preferably 21 or less, even more preferably 19 or less, and still more preferably 17 or less.
• ester represented by the general formula (3) examples include propylene glycol dicaprate, propylene glycol dioleate, neopentyl glycol dicaprate, neopentyl glycol di-2-ethylhexanoate, di(caprylic/capric)propanediol, propanediol diisostearate, ethylene glycol di-2-ethylhexanoate, tri(caprylic/capric)glyceryl, tri-2-ethylhexanoate, glyceryl tri-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexylate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, and natural fats and oils.
• natural fats and oils include triglycerides such as avocado oil, olive oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed oil, castor oil, cottonseed oil, and mink oil.
• triglycerides such as avocado oil, olive oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed oil, castor oil, cottonseed oil, and mink oil.
• esters of polyvalent carboxylic acids and monohydric alcohols include esters represented by the following general formula (4).
• R7 is a polycarboxylic acid residue having 2 to 10 carbon atoms
• R8 is a monohydric alcohol residue having 1 to 25 carbon atoms
• q is an integer of 2 to 10.
• q is preferably the same number as the number of carboxy groups in the polycarboxylic acid.
• the number of carbon atoms in R 8 is preferably 3 or more, and from the same viewpoint as above, preferably 23 or less, more preferably 21 or less, and even more preferably 19 or less.
• diisostearyl malate di-2-ethylhexyl succinate, diisobutyl adipate, di-2-heptylundecyl adipate, di-2-ethylhexyl sebacate, diisopropyl sebacate, and tri-2-ethylhexyl trimellitate.
• the ester oil is preferably an ester represented by general formula (1), general formula (3) or general formula (4), and more preferably a monoester of a linear or branched fatty acid having 8 to 18 carbon atoms and a linear or branched monohydric alcohol having 2 to 24 carbon atoms, a triester of a branched fatty acid having 6 to 18 carbon atoms and glycerin, a tetraester of a branched fatty acid having 6 to 18 carbon atoms and pentaerythritol, a diester of a linear or branched fatty acid having 6 to 18 carbon atoms and a branched dihydric alcohol having 2 to 10 carbon atoms, a monohydric alcohol having 6 to 18 carbon atoms and a tri ...
• a triester of a branched monohydric alcohol having 6 to 18 carbon atoms and a triester of a branched monohydric alcohol having 6 to 18 carbon atoms.
• alkyl benzoates C12-15
• alkyl benzoates for example, "Finsorb TN" (manufactured by Innospec Active Chemicals LLC)
• the silicone oil is preferably a dimethylpolysiloxane, and more preferably a dimethylpolysiloxane having a kinetic viscosity at 25° C. of 5,000 mm 2 /s or less.
• the kinetic viscosity of the silicone oil at 25° C. can be measured by an Ubbelohde viscometer in accordance with ASTM D 445-46T or JIS Z 8803.
• silicone oils include “KF-96A-6cs” (dimethylpolysiloxane), “KF-96A-10cs” (dimethylpolysiloxane), “KF-96A-20cs” (dimethylpolysiloxane), and “KF-96A-100cs” (dimethylpolysiloxane), manufactured by Shin-Etsu Chemical Co., Ltd.
• hydrocarbon oil examples include liquid paraffin, hydrogenated polyisobutene (liquid isoparaffin, heavy liquid isoparaffin), cycloparaffin, liquid ozokerite, squalene, squalane, pristane, ⁇ -olefin oligomer, polybutene, and isohexadecane.
• the higher alcohol examples include branched or unsaturated higher alcohols having 12 to 24 carbon atoms, such as 2-octyldodecanol, isostearyl alcohol, and oleyl alcohol. Among these, branched or unsaturated higher monohydric alcohols having 12 to 24 carbon atoms are preferred.
• the higher fatty acid include fatty acids having 12 to 22 carbon atoms, such as oleic acid and isostearic acid.
• the content of component (D) in the total amount of the emulsified cosmetic of the present invention is preferably 5% by mass or more, more preferably 7% by mass or more, even more preferably 10% by mass or more, and even more preferably 13% by mass or more, from the viewpoint of improving emulsion stability by incorporating component (B), reducing stickiness after application, and improving moisture. Also, from the viewpoint of improving emulsion stability and reducing stickiness after application, it is preferably 20% by mass or less, more preferably 17% by mass or less, and even more preferably 15% by mass or less. More specifically, it is preferably 5 to 20% by mass, more preferably 7 to 20% by mass, even more preferably 10 to 20% by mass, even more preferably 10 to 17% by mass, and even more preferably 13 to 15% by mass.
• the mass ratio of the content of component (B) to the content of component (D) in the total amount of the emulsified cosmetic of the present invention is preferably 0.1 or more, more preferably 0.2 or more, and even more preferably 0.3 or more, from the viewpoint of incorporating component (B) and improving emulsion stability, and is preferably 1.5 or less, more preferably 1.3 or less, even more preferably 1.1 or less, and even more preferably 0.9 or less, from the viewpoint of improving the ultraviolet protection effect. More specifically, it is preferably 0.1 to 1.5, more preferably 0.2 to 1.3, even more preferably 0.3 to 1.1, and even more preferably 0.3 to 0.9.
• the mass ratio of the content of component (D2) to the total amount of component (D) [component (D2)/component (D)] is preferably 0.2 or more, more preferably 0.3 or more, even more preferably 0.4 or more, and preferably 1.0 or less, from the viewpoint of improving emulsion stability. More specifically, it is preferably 0.2 to 1.0, more preferably 0.3 to 1.0, even more preferably 0.4 to 1.0.
• component (D) contains a liquid oil (D2) other than the liquid organic UV absorber (D1)
• the mass ratio of the content of component (D2) to the content of component (B) [component (D2)/component (B)] is, from the viewpoint of incorporating component (B) and improving emulsion stability, preferably 0.1 or more, more preferably 0.3 or more, even more preferably 0.5 or more, and preferably 3.0 or less, more preferably 2.5 or less, even more preferably 2.0 or less. More specifically, it is preferably 0.1 to 3.0, more preferably 0.3 to 3.0, even more preferably 0.3 to 2.5, even more preferably 0.5 to 2.0.
• the emulsion cosmetic of the present invention may contain, as component (E), a surfactant other than component (C) (hereinafter, also referred to as "component (E)").
• component (E) is not particularly limited, and any of nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants can be used. Among these, component (E) is preferably at least one selected from the group consisting of nonionic surfactants and amphoteric surfactants.
• Component (E) can be used alone or in combination of two or more.
• nonionic surfactants include one or more selected from the group consisting of sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene fatty acid esters, polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, alkyl glucosides, alkyl glyceryl ethers, sucrose fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters, polyoxyalkylene hydrogenated castor oil, alkyl saccharides, alkylamine oxides, alkylamidoamine oxides, and polyether-modified silicones.
• the alkyl groups in polyoxyalkylene alkyl ethers, alkyl glucosides, alkyl glyceryl ethers, alkyl saccharides, alkyl amine oxides, and alkyl amidoamine oxides, the alkenyl groups in polyoxyalkylene alkenyl ethers, and the fatty acids in sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene fatty acid esters, sucrose fatty acid esters, glycerin fatty acid esters, and polyglycerin fatty acid esters preferably have 8 to 22 carbon atoms, more preferably 10 to 20 carbon atoms, and even more preferably 12 to 18 carbon atoms.
• nonionic surfactants include sorbitan monostearate, sorbitan monoisostearate, sorbitan monooleate, polyoxyethylene sorbitan monolaurate (average EO added moles: 20) (polysorbate 20), polyoxyethylene sorbitan monostearate (average EO added moles: 20) (polysorbate 60), polyoxyethylene sorbitan monooleate (average EO added moles: 20) (polysorbate 80), polyoxyethylene trioleate (average EO added moles: 20) sorbitan (polysorbate 85), polyoxyethylene hydrogenated castor oil (average EO added moles: 60), polyoxyethylene hydrogenated castor oil (average EO added moles: 40), polyoxyethylene (average EO added moles: 7) lauryl ether, polyoxyethylene (average EO added moles: 7) trimethylolpropane coconut oil alkyl ether, and dimethicone copolyol.
• the nonionic surfactant is more preferably one or more selected from the group consisting of sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene alkyl ethers, polyoxyalkylene hydrogenated castor oil, and polyether-modified silicone, even more preferably one or more selected from the group consisting of sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene alkyl ethers, and polyoxyalkylene hydrogenated castor oil, and even more preferably one or more selected from the group consisting of sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, and polyoxyalkylene alkyl ethers.
• amphoteric surfactants include carboxybetaine types such as alkyldimethylaminoacetic acid betaine and fatty acid amidopropyl betaine; sulfobetaine types such as alkylsulfobetaine and alkylhydroxysulfobetaine; imidazoline betaine types such as alkylcarboxymethylhydroxyethylimidazolinium betaine; and phosphobetaine types such as lecithin, hydrogenated lecithin, and laurylhydroxyphosphobetaine.
• the amphoteric surfactant is preferably a phosphobetaine type, more preferably hydrogenated lecithin, and even more preferably hydrogenated soybean lecithin.
• component (E) is more preferably one or more selected from the group consisting of sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene alkyl ethers, polyoxyalkylene hydrogenated castor oil, polyether modified silicone, and hydrogenated lecithin, even more preferably one or more selected from the group consisting of sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene alkyl ethers, polyoxyalkylene hydrogenated castor oil, and hydrogenated lecithin, and even more preferably one or more selected from the group consisting of sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, and polyoxyalkylene alkyl ethers.
• the content of component (E) in the total amount of the emulsified cosmetic of the present invention is, from the viewpoints of forming a cosmetic coating film that can prevent the outflow of UV protection components into water and thereby maintain the UV protection effect well, improving emulsion stability, reducing stickiness after application, improving moisture, and preventing makeup from smudging, is 0 mass% or more, preferably 0.05 mass% or more, more preferably 0.10 mass% or more, even more preferably 0.15 mass% or more, still more preferably 0.17 mass% or more, and is less than 1 mass%, preferably 0.9 mass% or less, more preferably 0.8 mass% or less, even more preferably 0.6 mass% or less, still more preferably 0.5 mass% or less, and still more preferably 0.3 mass% or less.
• it is preferably 0 to 0.9 mass%, more preferably 0.05 to 0.8 mass%, even more preferably 0.10 to 0.6 mass%, even more preferably 0.15 to 0.5 mass%, and even more preferably 0.17 to 0.3 mass%.
• component (E) is one or more selected from the group consisting of sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, and polyoxyalkylene alkyl ethers
• the content of component (E) in the total amount of the emulsion cosmetic of the present invention is from the viewpoint of forming a cosmetic coating film that can suppress the outflow of UV protection ingredients into water and thereby maintaining the UV protection effect well, emulsion stability.
• the content is 0% by mass or more, preferably 0.05% by mass or more, more preferably 0.10% by mass or more, even more preferably 0.15% by mass or more,
• the content is preferably 0 to 0.9% by mass, more preferably 0.05 to 0.8% by mass, even more preferably 0.10 to 0.6% by mass, even more preferably 0.15 to 0.5% by mass, and even more preferably 0.17 to 0.3% by mass.
• the emulsion cosmetic of the present invention does not substantially contain component (E) from the viewpoints of forming a cosmetic coating film that can prevent the outflow of UV protective ingredients into water and thereby favorably maintaining the UV protective effect, improving emulsion stability, reducing stickiness after application, improving moisture, and preventing makeup from smudging.
• substantially free of component (E) means that component (E) is not intentionally added, and does not exclude the presence of component (E) contained in a commercially available product in the emulsion cosmetic of the present invention when the emulsion cosmetic of the present invention contains a component other than component (E) as the commercially available product.
• the content of component (E) in the total amount of the emulsion cosmetic of the present invention is less than 1 mass%, preferably 0.9 mass% or less, more preferably 0.8 mass% or less, even more preferably 0.6 mass% or less, still more preferably 0.5 mass% or less, and even more preferably 0.3 mass% or less.
• the anionic surfactant that may be used as component (E) inhibits the thickening effect of the acrylamide-based polymer that exhibits a thickening effect due to electrostatic repulsion as component (A), and reduces the viscosity of the aqueous phase, which is the continuous phase. Furthermore, when component (B) contains fine particles of titanium oxide or fine particles of zinc oxide having a positive charge, component (B) cannot be stably present in the oil phase due to electrostatic interaction between the positive charge of component (B) and the negative charge of the anionic surfactant, which tends to reduce emulsion stability and makes it difficult to maintain a good ultraviolet protection effect when the cosmetic coating film is wet with water.
• the content of the anionic surfactant as component (E) in the total amount of the emulsion cosmetic of the present invention is preferably less than 0.5 mass%, more preferably 0.4 mass% or less, even more preferably 0.3 mass% or less, even more preferably 0.1 mass% or less, and even more preferably 0 mass%.
• the emulsion cosmetic of the present invention may contain, in addition to components (A), (B), (C), (D), and (E), optional components used according to the intended use of the cosmetic, as long as the effects of the present invention are not impaired.
• optional components include oils, UV absorbers, water-soluble polymers, neutralizing agents, pH adjusters, bactericides, anti-inflammatory agents, preservatives, colorants, chelating agents, whitening agents, antiperspirants, insect repellents, bioactive ingredients, salts, antioxidants, fragrances, etc., other than components (A), (B), (C), (D), and (E).
• the emulsion cosmetic of the present invention may contain a solid oil agent as component (F) (hereinafter, also referred to as "component (F)").
• component (F) include higher alcohols such as cetyl alcohol, stearyl alcohol, and behenyl alcohol; higher fatty acids such as stearic acid and palmitic acid; solid oils and fats such as coconut oil, palm oil, and hardened oil; and waxes such as petrolatum, lanolin, ceresin, jojoba wax, microcrystalline wax, carnauba wax, and candelilla wax.
• the emulsion cosmetic of the present invention may contain a solid water-insoluble organic ultraviolet absorber as component (F) from the viewpoint of further improving the ultraviolet protection effect.
• a solid water-insoluble organic ultraviolet absorber as component (F) from the viewpoint of further improving the ultraviolet protection effect.
• water-insoluble means that the solubility in water is 1 w/w % or less.
• solid water-insoluble organic ultraviolet absorbers examples include 4-tert-butyl-4'-methoxydibenzoylmethane, 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, drometrizole trisiloxane, 2,4-bis ⁇ [4-(2-ethylhexyloxy)-2-hydroxy]phenyl ⁇ -6-(4-methoxyphenyl)-1,3,5-triazine, and 2-ethylhexyl dimethoxybenzylidene dioxoimidazolidinepropionate.
• These water-insoluble organic ultraviolet absorbers can be used alone or in combination of two or more.
• the solid water-insoluble organic ultraviolet absorber include 4-tert-butyl-4'-methoxydibenzoylmethane, 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, drometrizole trisiloxane, and 2,4-bis ⁇ [4-(2-ethylhexyloxy)-2-hydroxy]phenyl ⁇ -6-(4-methoxyphenyl)-1,3,5-triazine, more preferably at least one selected from the group consisting of 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5
• UV absorbers include "PARSOL 1789” (4-tert-butyl-4'-methoxydibenzoylmethane) (manufactured by DSM); "UVINUL A PLUS" (2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate), "UVINUL T-150” (2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, display name: ethylhexyl triazone), and "UVINUL M40" (2-hydro oxy-4-methoxybenzophenone), "TINOSORB S” (2,4-bis ⁇ [4-(2-ethylhexyloxy)-2-hydroxy]phenyl ⁇ -6-(4-methoxyphenyl)-1,3,5-triazine) (all manufactured by BASF); "Mosacare A440" (drome
• the content of component (F) in the total amount of the emulsified cosmetic of the present invention is preferably 0.5% by mass or more, more preferably 1% by mass or more, even more preferably 2% by mass or more, from the viewpoint of emulsion stability, and is preferably 10% by mass or less, more preferably 8% by mass or less, even more preferably 6% by mass or less. More specifically, from the same viewpoint as above, it is preferably 0.5 to 10% by mass, more preferably 1 to 8% by mass, even more preferably 2 to 6% by mass.
• the content of the solid water-insoluble organic UV absorber in the total amount of the emulsion cosmetic of the present invention is preferably 0.5% by mass or more, more preferably 1% by mass or more, even more preferably 2% by mass or more, from the viewpoint of improving the UV protection effect, and is preferably 10% by mass or less, more preferably 8% by mass or less, even more preferably 6% by mass or less. More specifically, from the same viewpoint as above, it is preferably 0.5 to 10% by mass, more preferably 1 to 8% by mass, even more preferably 2 to 6% by mass.
• the emulsion cosmetic of the present invention further contains a polyhydric alcohol as component (G) (hereinafter also referred to as “component (G)”).
• polyhydric alcohol examples include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (average molecular weight less than 650), 1,2-propanediol (propylene glycol), 1,3-propanediol (propanediol), dipropylene glycol, polypropylene glycol (average molecular weight less than 650), isoprene glycol, and 1,3-butylene glycol; and trivalent or higher polyhydric alcohols such as glycerin, diglycerin, and polyglycerin.
• glycols such as ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (average molecular weight less than 650), 1,2-propanediol (propylene glycol), 1,3-propanediol (propanediol), dipropylene glycol, polypropylene glycol (average molecular weight less than 650), isoprene glycol, and 1,
• the polyhydric alcohol is preferably a polyhydric alcohol having 2 to 12 carbon atoms, more preferably a polyhydric alcohol having 2 to 6 carbon atoms, still more preferably one or more selected from the group consisting of ethylene glycol, diethylene glycol, 1,2-propanediol (propylene glycol), 1,3-propanediol (propanediol), dipropylene glycol, 1,3-butylene glycol, and glycerin, and even more preferably one or more selected from the group consisting of propanediol, dipropylene glycol, 1,3-butylene glycol, and glycerin.
• These polyhydric alcohols may be used alone or in combination of two or more.
• the content of component (G) in the total amount of the emulsion cosmetic of the present invention is preferably 0.5% by mass or more, more preferably 1% by mass or more, even more preferably 2% by mass or more, even more preferably 3% by mass or more, even more preferably 4% by mass or more, and is preferably 10% by mass or less, more preferably 8% by mass or less, even more preferably 6% by mass or less, from the viewpoints of suppressing stickiness after application and improving moisture. More specifically, from the same viewpoints as above, it is preferably 0.5 to 10% by mass, more preferably 1 to 8% by mass, even more preferably 2 to 6% by mass, even more preferably 3 to 6% by mass, even more preferably 4 to 6% by mass.
• the emulsion cosmetic of the present invention contains at least water as an aqueous medium in addition to component (G).
• the aqueous medium other than component (G) and water may further contain, for example, a saturated monohydric alcohol having from 1 to 3 carbon atoms, such as ethanol, propyl alcohol, isopropyl alcohol, etc.
• the water content in the total amount of the emulsion cosmetic of the present invention may be within a range that allows the emulsion cosmetic to become an oil-in-water emulsion cosmetic, and from the viewpoint of improving emulsion stability, it is preferably 30% by mass or more, more preferably 40% by mass or more, even more preferably 50% by mass or more, still more preferably 55% by mass or more, still more preferably 60% by mass or more, and preferably 90% by mass or less, more preferably 80% by mass or less, and even more preferably 75% by mass or less. More specifically, it is preferably 30 to 90% by mass, more preferably 40 to 80% by mass, even more preferably 50 to 75% by mass, still more preferably 55 to 75% by mass, and even more preferably 60 to 75% by mass.
• the emulsion cosmetic of the present invention can be suitably used as skin cosmetics such as sunscreen cosmetics, face washes, cleansing cosmetics, packs, massage cosmetics, etc., and hair cosmetics such as shampoos, rinses, conditioners, etc.
• skin cosmetics such as sunscreen cosmetics, face washes, cleansing cosmetics, packs, massage cosmetics, etc.
• hair cosmetics such as shampoos, rinses, conditioners, etc.
• the emulsion cosmetic of the present invention has excellent ultraviolet protection effect, and therefore is preferably applied for sunscreen purposes such as sunscreen cosmetics (lotion, cream, milky lotion, serum, etc.), suntan, makeup base cosmetics, foundations, etc.
• the emulsion cosmetic of the present invention can be in any form, such as liquid, emulsion, cream, paste, solid, multi-layer, etc., and can also be used as a sheet, spray, or mousse.
• the method for producing the emulsion cosmetic of the present invention is not particularly limited, and a known method can be appropriately used depending on the formulation of the oil-in-water emulsion cosmetic. For example, there is a method including a step of blending component (A), component (B), component (C), component (D), and optionally component (E) and the above-mentioned optional components, and mixing them uniformly with a homomixer or the like.
• a method for producing the emulsion cosmetic of the present invention from the viewpoints of increasing the dispersibility of component (B) in the oil-in-water emulsion cosmetic and improving the UV protection effect and emulsion stability, as well as reducing stickiness after application, improving the moisture and freshness, and preventing makeup from smudging, a method including a step of mixing and emulsifying a dispersion of component (B) in an oil phase component containing component (C), component (D), and, if necessary, the above-mentioned oil-soluble optional component, with a preparation of an aqueous phase component containing component (A), an aqueous medium, and, if necessary, component (E) and the above-mentioned water-soluble optional component is more preferable, and a method including the following steps I to III is more preferable.
• Step I A step of adding component (B) to component (C), component (D), and, if necessary, the aforementioned optional oil-soluble component, and uniformly mixing to obtain a dispersion (i) in which component (B) is dispersed.
• Step II A step of uniformly mixing an aqueous phase component containing component (A), an aqueous medium, and, if necessary, component (E), and the aforementioned optional water-soluble component, to obtain preparation (ii).
• Step III A step of adding dispersion (i) obtained in step I to preparation (ii) obtained in step II, and uniformly mixing and emulsifying to obtain an oil-in-water emulsion cosmetic.
• step I preferably includes the following steps I-1 and I-2.
• Step I-1 A step of uniformly mixing the oil phase components including the component (C), the component (D), and, if necessary, the above-mentioned optional oil-soluble components to obtain a preparation (i').
• Step I-2 A step of adding the component (B) to the preparation (i') obtained in step I-1, uniformly mixing, and obtaining a dispersion (i) in which the component (B) is dispersed.
• step II The mixing of the oil phase components in step I-1 and the mixing of the aqueous phase components in step II are each preferably carried out with stirring while heating at a temperature in the range of 20° C. or higher and 90° C. or lower.
• step II the resulting preparation (ii) is preferably cooled to a temperature range of 15° C. or more and 35° C. or less, and then mixed uniformly to obtain the preparation (ii).
• step III it is preferable to add the dispersion (i) obtained in step I while stirring the preparation (ii) obtained in step II, preferably maintaining the temperature at 30° C. or higher and 90° C. or lower, and mix and emulsify uniformly.
• the present invention further discloses the following embodiments.
• the content of component (A) is 0.6% by mass or more and 1.5% by mass or less
• the content of component (C) is 0.2% by mass or more and 5% by mass or less
• An oil-in-water emulsion cosmetic comprising as component (E) a surfactant other than component (C) in an amount of less than 1 mass%.
• component (A) preferably contains one or more structural units derived from an acrylamide monomer selected from the group consisting of acrylamide and acryloyldimethyltauric acid, more preferably one or more selected from the group consisting of a homopolymer of acrylamide, a homopolymer of acryloyldimethyltauric acid and a salt thereof, and a copolymer containing one or more structural units derived from an acrylamide monomer selected from the group consisting of acrylamide and acryloyldimethyltauric acid and a salt thereof, and even more preferably one or more selected from the group consisting of a homopolymer of acrylamide, and a copolymer containing one or more structural units derived from an acrylamide monomer selected from the group consisting of acrylamide and acryloyldimethyltauric acid and a salt thereof.
• the component (A) is preferably polyacrylamide, (acrylic acid/acrylamide) copolymer, (acrylic acid/acryloyldimethyltaurate) copolymer, (dimethylacrylamide/acryloyldimethyltaurate) copolymer, (acrylic acid/acryloyldimethyltaurate/dimethylacrylamide) copolymer, (hydroxyethyl acrylate/acryloyldimethyltaurate) copolymer, (acryloyldimethyltaurate/vinylpyrrolidone) copolymer, (acryloyldimethyltaurate/vinylformamide ...
• the oil-in-water emulsion cosmetic according to ⁇ 1> or ⁇ 2> wherein the copolymer is at least one selected from the group consisting of a polyoxyethylene alkyl ester of methacrylic acid/polyoxyethylene alkyl ester of methacrylic acid (average number of moles of ethylene oxide added: 10 to 30) copolymer, and salts thereof, and is more preferably at least one selected from the group consisting of a (sodium acrylate/sodium acryloyldimethyl taurate) copolymer, a (hydroxyethyl acrylate/sodium acryloyldimethyl taurate) copolymer, an (ammonium acryloyldimethyl taurate/vinyl pyrrolidone) copolymer, and a polyacrylamide.
• the copolymer is at least one selected from the group consisting of a polyoxyethylene alkyl ester of methacrylic acid/polyoxyethylene alkyl este
• ⁇ 4> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 3>, wherein the content of component (A) is preferably 0.7% by mass or more, more preferably 0.8% by mass or more, and is preferably 1.3% by mass or less, more preferably 1.1% by mass or less, even more preferably 1.0% by mass or less, and still more preferably 0.9% by mass or less.
• ⁇ 5> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 3>, wherein the content of component (A) is preferably 0.6 to 1.3 mass%, more preferably 0.6 to 1.1 mass%, even more preferably 0.6 to 1.0 mass%, still more preferably 0.7 to 1.0 mass%, and even more preferably 0.8 to 0.9 mass%.
• ⁇ 6> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 5>, wherein the fine particle metal oxide of component (B) is preferably at least one selected from the group consisting of fine particle zinc oxide, fine particle titanium oxide, and fine particle cerium oxide, and more preferably at least one selected from the group consisting of fine particle zinc oxide and fine particle titanium oxide.
• component (B) is preferably one or more selected from the group consisting of a silicone treatment, an alkylalkoxysilane treatment, and a fatty acid treatment, and more preferably one or more selected from the group consisting of a silicone treatment using one or more selected from the group consisting of dimethylpolysiloxane (dimethicone), methylhydrogenpolysiloxane (methicone), and dimethylsiloxane/methylhydrogensiloxane copolymer (hydrogen dimethicone) as a surface treatment agent; an alkylalkoxysilane treatment using an alkylalkoxysilane having a linear or branched alkyl group having from 6 to 20 carbon atoms as a surface treatment agent; and a fatty acid treatment using a linear or branched higher fatty acid having from 14 to 22 carbon
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 7>, wherein the average primary particle size of component (B) is preferably 1 ⁇ m or less, more preferably 800 nm or less, even more preferably 500 nm or less, still more preferably 300 nm or less, still more preferably 200 nm or less, still more preferably 100 nm or less, still more preferably 90 nm or less, still more preferably 50 nm or less, still more preferably 40 nm or less, still more preferably 30 nm or less, still more preferably 25 nm or less, and is preferably 1 nm or more, more preferably 3 nm or more, and still more preferably 5 nm or more.
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 7>, wherein the average primary particle size of component (B) is preferably 1 nm to 1 ⁇ m, more preferably 1 to 800 nm, even more preferably 3 to 500 nm, still more preferably 5 to 300 nm, still more preferably 5 to 200 nm, still more preferably 5 to 100 nm, still more preferably 5 to 90 nm, still more preferably 5 to 50 nm, still more preferably 5 to 40 nm, still more preferably 5 to 30 nm, and still more preferably 5 to 25 nm.
• the average primary particle size of component (B) is preferably 1 nm to 1 ⁇ m, more preferably 1 to 800 nm, even more preferably 3 to 500 nm, still more preferably 5 to 300 nm, still more preferably 5 to 200 nm, still more preferably 5 to 100 nm, still more preferably 5 to 90 nm, still more
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 9>, wherein the content of component (B) is preferably 3% by mass or more, more preferably 4% by mass or more, even more preferably 5% by mass or more, still more preferably 7% by mass or more, still more preferably 10% by mass or more, and is preferably 30% by mass or less, more preferably 27% by mass or less, even more preferably 25% by mass or less, still more preferably 20% by mass or less, and still more preferably 15% by mass or less.
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 9>, wherein the content of component (B) is preferably 3 to 30 mass%, more preferably 3 to 27 mass%, even more preferably 3 to 25 mass%, still more preferably 3 to 20 mass%, still more preferably 3 to 15 mass%, still more preferably 4 to 15 mass%, still more preferably 5 to 15 mass%, still more preferably 7 to 15 mass%, and still more preferably 10 to 15 mass%.
• ⁇ 12> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 11>, wherein the content of component (C) is preferably 0.3% by mass or more, more preferably 0.5% by mass or more, even more preferably 0.7% by mass or more, and is preferably 4% by mass or less, more preferably 3% by mass or less, even more preferably 2% by mass or less.
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 11>, wherein the content of component (C) is preferably 0.2 to 4 mass%, more preferably 0.2 to 3 mass%, even more preferably 0.3 to 3 mass%, still more preferably 0.5 to 3 mass%, even more preferably 0.7 to 3 mass%, and still more preferably 0.7 to 2 mass%.
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 13>, wherein the mass ratio of the content of component (B) to the content of component (C) [component (B)/component (C)] is preferably 0.5 or more, more preferably 1 or more, even more preferably 2 or more, still more preferably 3 or more, still more preferably 4 or more, still more preferably 5 or more, and is preferably 120 or less, more preferably 90 or less, even more preferably 75 or less, still more preferably 60 or less, still more preferably 50 or less, still more preferably 30 or less, still more preferably 20 or less, and still more preferably 15 or less.
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 13>, wherein the mass ratio of the content of component (B) to the content of component (C) [component (B)/component (C)] is preferably 0.5 to 120, more preferably 1 to 90, even more preferably 2 to 90, still more preferably 3 to 75, still more preferably 4 to 75, still more preferably 5 to 75, still more preferably 5 to 60, still more preferably 5 to 50, still more preferably 5 to 30, still more preferably 5 to 20, and still more preferably 5 to 15.
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 15>, wherein the mass ratio of the content of component (B) to the total content of component (A) and component (C) [component (B)/[component (A)+component (C)]] is preferably 0.3 or more, more preferably 1.0 or more, even more preferably 1.5 or more, still more preferably 2.0 or more, and is preferably 40 or less, more preferably 30 or less, even more preferably 20 or less, still more preferably 15 or less, still more preferably 13 or less, still more preferably 10 or less, and still more preferably 8.0 or less.
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 15>, wherein the mass ratio of the content of component (B) to the total content of component (A) and component (C) [component (B)/[component (A)+component (C)]] is preferably 0.3 to 40, more preferably 1.0 to 40, even more preferably 1.5 to 30, still more preferably 2.0 to 30, still more preferably 2.0 to 20, still more preferably 2.0 to 15, still more preferably 2.0 to 13, still more preferably 2.0 to 10, and still more preferably 2.0 to 8.0.
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 17>, wherein the component (D) contains a liquid oil agent (D2) other than the liquid organic ultraviolet absorber (D1).
• the mass ratio of the content of component (D2) to the total amount of component (D) [component (D2)/component (D)] is preferably 0.2 or more, more preferably 0.3 or more, even more preferably 0.4 or more, and is preferably 1.0 or less.
• the oil-in-water emulsion cosmetic according to any one of ⁇ 18> to ⁇ 20>, wherein the mass ratio of the content of component (D2) to the content of component (B) [component (D2)/component (B)] is preferably 0.1 or more, more preferably 0.3 or more, even more preferably 0.5 or more, and is preferably 3.0 or less, more preferably 2.5 or less, even more preferably 2.0 or less.
• component (D2) is at least one selected from the group consisting of ester oils, silicone oils, hydrocarbon oils, higher alcohols, and higher fatty acids.
• ⁇ 24> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 23>, wherein the content of component (D) is preferably 5% by mass or more, more preferably 7% by mass or more, even more preferably 10% by mass or more, still more preferably 13% by mass or more, and is preferably 20% by mass or less, more preferably 17% by mass or less, and even more preferably 15% by mass or less.
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 23>, wherein the content of component (D) is preferably 5 to 20 mass%, more preferably 7 to 20 mass%, even more preferably 10 to 20 mass%, still more preferably 10 to 17 mass%, and even more preferably 13 to 15 mass%.
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 25>, wherein the mass ratio of the content of component (B) to the content of component (D) [component (B)/component (D)] is preferably 0.1 or more, more preferably 0.2 or more, even more preferably 0.3 or more, and is preferably 1.5 or less, more preferably 1.3 or less, even more preferably 1.1 or less, and still more preferably 0.9 or less.
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 25>, wherein the mass ratio of the content of component (B) to the content of component (D) [component (B)/component (D)] is preferably 0.1 to 1.5, more preferably 0.2 to 1.3, even more preferably 0.3 to 1.1, and still more preferably 0.3 to 0.9.
• component (E) contains a surfactant other than component (C)
• component (E) is preferably one or more selected from the group consisting of nonionic surfactants and amphoteric surfactants, more preferably one or more selected from the group consisting of sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene alkyl ethers, polyoxyalkylene hydrogenated castor oil, polyether-modified silicones, and hydrogenated lecithin, even more preferably one or more selected from the group consisting of sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene alkyl ethers, polyoxyalkylene hydrogenated castor oil, and hydrogenated lecithin, and still more preferably one or more selected from the group consisting of sorbitan fatty acid esters, poly
• ⁇ 29> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 28>, wherein the content of component (E) is 0% by mass or more, preferably 0.05% by mass or more, more preferably 0.10% by mass or more, even more preferably 0.15% by mass or more, still more preferably 0.17% by mass or more, and preferably 0.9% by mass or less, more preferably 0.8% by mass or less, even more preferably 0.6% by mass or less, still more preferably 0.5% by mass or less, and still more preferably 0.3% by mass or less.
• the content of component (E) is 0% by mass or more, preferably 0.05% by mass or more, more preferably 0.10% by mass or more, even more preferably 0.15% by mass or more, still more preferably 0.17% by mass or more, and preferably 0.9% by mass or less, more preferably 0.8% by mass or less, even more preferably 0.6% by mass or less, still more preferably 0.5% by mass or less, and still more
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 29>, wherein the content of component (E) is preferably 0 to 0.9 mass%, more preferably 0.05 to 0.8 mass%, even more preferably 0.10 to 0.6 mass%, still more preferably 0.15 to 0.5 mass%, and even more preferably 0.17 to 0.3 mass%.
• ⁇ 31> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 30>, wherein the content of the anionic surfactant as component (E) is preferably less than 0.5% by mass, more preferably 0.4% by mass or less, even more preferably 0.3% by mass or less, still more preferably 0.1% by mass or less, and still more preferably 0% by mass.
• component (E) is preferably less than 0.5% by mass, more preferably 0.4% by mass or less, even more preferably 0.3% by mass or less, still more preferably 0.1% by mass or less, and still more preferably 0% by mass.
• ⁇ 32> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 31>, which substantially does not contain a component (E).
• the oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 32>, wherein the water content is preferably 30% by mass or more, more preferably 40% by mass or more, even more preferably 50% by mass or more, still more preferably 55% by mass or more, still more preferably 60% by mass or more, and is preferably 90% by mass or less, more preferably 80% by mass or less, and even more preferably 75% by mass or less.
• ⁇ 34> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 32>, wherein the water content is preferably 30 to 90 mass%, more preferably 40 to 80 mass%, even more preferably 50 to 75 mass%, still more preferably 55 to 75 mass%, and even more preferably 60 to 75 mass%.
• ⁇ 35> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 34>, which is used for sunscreen purposes.
• the average primary particle diameters of components (B) and (B') were measured by the following method.
• TEM transmission electron microscope
• the maximum short diameters of 300 primary particles in an image observed with the TEM at a magnification of 50,000 times were measured, and the number average value was taken as the average primary particle diameter.
• the maximum short diameter means the short diameter having the greatest length among the short diameters perpendicular to the long diameter.
• the thicknesses of 300 primary particles in an image observed under the same method and magnification conditions as above were measured, and the number average value was taken as the average primary particle diameter.
• the dispersion of the measurement sample was prepared by adding 95 g of ethanol as a solvent to 5 g of the measurement sample and subjecting the mixture to ultrasonic dispersion.
• Preparation Example 1 (Preparation of stearic acid/aluminum hydroxide treated titanium dioxide fine particles B1) 92 parts by mass of titanium dioxide fine particles treated with aluminum hydroxide (shape: needle-like, average primary particle diameter: 15 nm) as component (B') and 8 parts by mass of stearic acid as a surface treatment agent were added to isopropyl alcohol and thoroughly stirred, and then heat-treated in a dryer at 120°C for 16 hours. The resulting dried product was pulverized to obtain titanium dioxide fine particles B1 treated with stearic acid and aluminum hydroxide to be used as component (B). The average primary particle diameter of titanium dioxide fine particles B1 treated with stearic acid and aluminum hydroxide was 15 nm.
• Preparation Example 2 (Preparation of triethoxycaprylylsilane-treated zinc oxide microparticles B2) As component (B'), 93 parts by mass of zinc oxide fine particles (shape: spherical, average primary particle diameter: 20 nm), 7 parts by mass of octyltriethoxysilane (triethoxycaprylylsilane) as a surface treatment agent, and a slurry consisting of toluene were prepared, and were pulverized and disintegrated using a bead mill (Dyno Mill manufactured by Shinmaru Enterprises Co., Ltd.).
• triethoxycaprylylsilane-treated zinc oxide fine particles B2 was used as component (B).
• the average primary particle diameter of triethoxycaprylylsilane-treated zinc oxide fine particles B2 was 20 nm.
• Preparation Example 3 (Preparation of Methicone-treated Zinc Oxide Microparticles B3) A slurry was prepared from 97 parts by mass of zinc oxide fine particles (shape: spherical, average primary particle diameter: 35 nm) as component (B'), 3 parts by mass of methylhydrogenpolysiloxane (methicone) ("KF-99P" manufactured by Shin-Etsu Chemical Co., Ltd.) as a surface treatment agent, and isopropyl alcohol, and the slurry was thoroughly stirred and pulverized, after which the solvent was distilled off by heating under reduced pressure, and heat treatment was carried out in air at 150°C for 4 hours to obtain methicone-treated zinc oxide fine particles B3 to be used as component (B).
• the average primary particle diameter of the methicone-treated zinc oxide fine particles B3 was 35 nm.
• Preparation Example 4 (Preparation of Dimethicone-treated Zinc Oxide Microparticles B4) 88 parts by mass of zinc oxide fine particles (shape: approximately spherical, average primary particle diameter 25 nm) as component (B') and 12 parts by mass of dimethylpolysiloxane (dimethicone) (dynamic viscosity 20 mm2/s, manufactured by Shin-Etsu Chemical Co., Ltd.) as a surface treatment agent were added to toluene and thoroughly stirred, and then the toluene was removed by heating under reduced pressure. The obtained powder was pulverized using an atomizer.
• dimethicone-treated zinc oxide fine particles B4 was used as component (B).
• the average primary particle diameter of dimethicone-treated zinc oxide fine particles B4 was 35 nm.
• Preparation Example 5 (Preparation of triethoxycaprylylsilane-silica treated titanium dioxide fine particle B5) 91 parts by mass of silica-treated titanium dioxide fine particles (shape: needle-like, average primary particle diameter: 15 nm) as component (B') and 9 parts by mass of octyltriethoxysilane (triethoxycaprylylsilane) as surface treatment agent are put into isopropyl alcohol and stirred thoroughly, then heat treated at 120°C in a dryer for 16 hours. The obtained dried product is pulverized to obtain triethoxycaprylylsilane-silica treated titanium dioxide fine particles B5 to be used as component (B). The average primary particle diameter of triethoxycaprylylsilane-silica treated titanium dioxide fine particles B5 is 15 nm.
• Examples 1 to 26, Comparative Examples 1 to 8 According to the formulations shown in Tables 2 to 5, oil-in-water emulsion cosmetics were obtained by the following method.
• the blending amounts shown in Tables 2 to 5 are the amount of active ingredient (mass %) of each component.
• the raw materials used in Tables 2 to 5 are shown in Table 1.
• polyoxyethylene sorbitan monooleate (20 E.O.) polysorbate 80
• sorbitan oleate polyoxyethylene sorbitan monostearate (20 E.O.) (polysorbate 60)
• sorbitan isostearate and laureth-7 shown in Tables 2 to 5 are amounts carried over from commercially available products containing component (A).
• Each sample was then irradiated with ultraviolet light from a fixed distance (10 mm) using an SPF analyzer (Optometics Inc.).
• the transmitted ultraviolet light was detected at 10 points on each sample in the wavelength range of 290 to 400 nm by the SPF analyzer, and an averaged spectrum was obtained to calculate the SPF value after immersion.
• the SPF value retention rate was calculated from the initial SPF value and the SPF value after immersion according to the following criteria, and the UV protection effect after wetting the cosmetic coating film with water was evaluated. The higher the SPF value retention rate, the better the UV protection effect after wetting the cosmetic coating film with water.
• SPF value maintenance rate (%) [(SPF value after immersion)/(initial SPF value)] ⁇ 100
• Tables 2 to 5 show that the oil-in-water emulsion cosmetics according to the examples of the present invention have superior emulsion stability compared to the oil-in-water emulsion cosmetics of the comparative examples, form a cosmetic coating film that can prevent UV protection ingredients from leaking into water, and can maintain UV protection effects well. Furthermore, even after application, they are less sticky, have a good sense of freshness, and can prevent makeup from smudging.

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