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
• • 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
• • 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
  • A61K8/31—Hydrocarbons
• • 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
  • A61K8/34—Alcohols
• • 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
  • A61K8/36—Carboxylic acids; Salts or anhydrides 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
• • 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
  • A61K8/73—Polysaccharides
• • 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
  • A61K8/84—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
  • A61K8/86—Polyethers
• • 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
  • A61K8/89—Polysiloxanes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q1/00—Make-up preparations; Body powders; Preparations for removing make-up
• • 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

Definitions

• the present invention relates to an oil-in-water emulsion cosmetic.
• Oil-in-water emulsion cosmetics are widely used in sunscreen cosmetics and the like because they have an excellent feel when used, such as being highly moisturizing and having a fresh feel to the touch.
• sunscreen cosmetics various UV absorbers and UV scattering agents are used to enhance the UV protection effect, but the blending of these ingredients can sometimes impair the feel of the oil-in-water emulsion cosmetics when used.
• oil-in-water emulsion cosmetics that use oil-soluble UV absorbers can cause problems such as stickiness after application and reduced stability.
• Patent Document 1 describes how, in an oil-in-water emulsion cosmetic that uses an oil-soluble UV absorber, stickiness can be reduced and stability can be improved by blending a polar oil with a melting point of 30°C or higher and 45°C or lower with a higher alcohol or higher fatty acid that is solid at 25°C.
• the present applicant has disclosed an oil-in-water emulsion cosmetic that has excellent emulsion stability over time at high temperatures even when a high concentration of zinc oxide is blended as an ultraviolet scattering agent together with a solid oil-soluble ultraviolet absorber by using an (acrylic/beheneth methacrylate) copolymer and polyhydroxystearic acid (Patent Document 2), and this oil-in-water emulsion cosmetic suppresses viscosity changes at high temperatures.
• the object of the present invention is to provide an oil-in-water emulsion cosmetic that is highly stable against temperature changes.
• the inventors conducted extensive research to solve the above problems and discovered that by combining a specific acrylic polymer and a polysaccharide polymer having a branched structure with a specific liquid oil, a hydrophobized metal oxide, and a dispersant, it is possible to obtain an oil-in-water emulsion cosmetic that is highly stable against temperature changes and that suppresses viscosity changes at high and low temperatures, thereby completing the present invention.
• the oil-in-water emulsion cosmetic contains: (A) one or more selected from the group consisting of (meth)acrylic acid or a copolymer of a (meth)acrylic acid alkyl ester and (meth)acrylic acid (polyoxyethylene monoalkyl ether), and a copolymer containing acryloyldimethyltaurine as a structural unit or a salt thereof; (B) a branched polysaccharide; (C) one or more liquid oils at 25° C.
• ⁇ 3> The oil-in-water emulsion cosmetic according to ⁇ 1> or ⁇ 2>, wherein the viscosity ratio of the viscosity (mPa ⁇ s) at 5°C to the viscosity (mPa ⁇ s) at 40°C of the oil-in-water emulsion cosmetic (viscosity at 5°C/viscosity at 40°C) is 0.5 to 7.0.
• ⁇ 4> The oil-in-water emulsion cosmetic according to ⁇ 1> or ⁇ 2>, wherein a content mass ratio of component (D) to a total content of component (A) and component (B), (component (D)/(component (A)+component (B))), is 10 to 85.
• ⁇ 5> The oil-in-water emulsion cosmetic according to ⁇ 1> or ⁇ 2>, wherein the component (B) is a polysaccharide having mannose and/or glucuronic acid as a constituent unit.
• component (B) is a polysaccharide having mannose and/or glucuronic acid as a constituent unit.
• ⁇ 6> The oil-in-water emulsion cosmetic according to ⁇ 1> or ⁇ 2>, wherein the ester oil of component (C) is one or more selected from the group consisting of alkyl benzoates (C12-C15), diisopropyl sebacate, and cetyl 2-ethylhexanoate.
• the hydrophobization treatment of component (D) is one or more treatments selected from the group consisting of a silicone treatment, an alkylalkoxysilane treatment, an amino acid treatment, an acylated amino acid treatment, a fatty acid treatment, a fatty acid ester treatment, and a phospholipid treatment.
• the oil-in-water emulsion cosmetic according to ⁇ 10> containing, as component (D), (D-1) a silicone-treated and/or alkylalkoxysilane-treated metal oxide, and (D-2) one or more kinds of metal oxides selected from the group consisting of an amino acid-treated metal oxide, an acylated amino acid-treated metal oxide, a fatty acid-treated metal oxide, a fatty acid ester-treated metal oxide, and a phospholipid-treated metal oxide.
• component (D) containing, as component (D), (D-1) a silicone-treated and/or alkylalkoxysilane-treated metal oxide, and (D-2) one or more kinds of metal oxides selected from the group consisting of an amino acid-treated metal oxide, an acylated amino acid-treated metal oxide, a fatty acid-treated metal oxide, a fatty acid ester-treated metal oxide, and a phospholipid-treated metal oxide.
• ⁇ 12> The oil-in-water emulsion cosmetic
• ⁇ 16> The oil-in-water emulsion cosmetic according to ⁇ 1> or ⁇ 2>, wherein the viscosity of the oil-in-water emulsion cosmetic the next day after storage at 40° C. is 10,000 mPa ⁇ s or more.
• ⁇ 17> The oil-in-water emulsion cosmetic according to ⁇ 1> or ⁇ 2>, wherein the oil-in-water emulsion cosmetic is a sunscreen cosmetic or a makeup cosmetic.
• the oil-in-water emulsion cosmetic of the present invention has excellent stability against temperature changes, can maintain a good feel over a wide range of temperatures from high to low, and also has excellent cosmetic durability.
• the present invention will be described in detail below. The following description of the present invention may be based on preferred embodiments of the present invention, but the present invention is not limited to such embodiments.
• the use of "to” indicating a range of values means that the values before and after it are included as the lower limit and upper limit.
• the "average particle size” in this specification refers to the number average value (D50) obtained by observing the surface state using a scanning electron microscope (JSM-7800prime, manufactured by JEOL Ltd.) and measuring 1000 particles using an image analyzer (LUZEX AP, manufactured by Nireco Corporation). In the case of an asymmetric shape, the median diameter D50 obtained from the distribution of the largest particle diameter is regarded as the average particle size in the present invention.
• (meth)acrylic is used as a concept that includes both acrylic and methacrylic
• “(meth)acryloyl” is used as a concept that includes both acryloyl and methacryloyl.
• the oil-in-water emulsion composition of the present invention contains one or more selected from the group consisting of (A-1) a copolymer of (meth)acrylic acid or a (meth)acrylic acid alkyl ester, and (meth)acrylic acid (polyoxyethylene monoalkyl ether), and (A-2) a copolymer containing acryloyldimethyltaurine as a constituent unit, or a salt thereof.
• component (A-1) The copolymer according to component (A-1) is obtained by copolymerizing a monomer (a) selected from the group consisting of (meth)acrylic acid and (meth)acrylic acid acrylic esters, and a monomer (b) consisting of a (meth)acrylic acid polyoxyethylene alkyl ether.
• the number of carbon atoms in the alkyl group of the alkyl ester is preferably 1 to 22, more preferably 1 to 18, and even more preferably 1 to 8.
• the (meth)acrylic acid alkyl ester include methyl (meth)acrylate, ethyl (meth)acrylate, and propyl (meth)acrylate.
• the number of moles of ethylene oxide added is preferably 10-30, more preferably 12-25, and even more preferably 20-25.
• the alkyl group of the alkyl ether preferably has 12 to 24 carbon atoms, and more preferably has 16 to 22 carbon atoms.
• esters of acrylic acid and polyoxyethylene (20) stearyl ether examples include esters of acrylic acid and polyoxyethylene (20) stearyl ether, esters of methacrylic acid and polyoxyethylene (20) stearyl ether, esters of acrylic acid and polyoxyethylene (25) behenyl ether, and esters of methacrylic acid and polyoxyethylene (25) behenyl ether, with esters of methacrylic acid and polyoxyethylene (25) behenyl ether being more preferred.
• the numbers in parentheses indicate the number of moles of ethylene oxide added.
• the bonding mode of the copolymer (A-1) according to the present invention is not particularly limited, and examples thereof include block bonding and random bonding. In addition, it may contain other monomers and may have a crosslinked structure.
• the content of the other monomers is preferably 10 mol% or less, more preferably 5 mol% or less, and even more preferably 1 mol% or less, based on the total monomers.
• the lower limit of the content of the other monomers is 0 mol%.
• the content ratio of monomer (a) to monomer (b) in the copolymer of component (A) is not particularly limited, and for example, the molar ratio of monomer (b) to monomer (a) (monomer (b)/monomer (a)) is 1 to 100.
• copolymer of component (A-1) examples include (meth)acrylic acid/(meth)acrylic acid alkyl ester/(meth)acrylic acid polyoxyethylene alkyl ether copolymers such as acrylates/polyoxyethylene methacrylate (20) cetyl ether copolymer, acrylates/polyoxyethylene methacrylate (20) stearyl ether copolymer, and acrylates/polyoxyethylene methacrylate (25) behenyl ether copolymer.
• (meth)acrylic acid/(meth)acrylic acid alkyl ester/(meth)acrylic acid polyoxyethylene alkyl ether copolymers such as acrylates/polyoxyethylene methacrylate (20) cetyl ether copolymer, acrylates/polyoxyethylene methacrylate (20) stearyl ether copolymer, and acrylates/polyoxyethylene methacrylate (25) behenyl ether copolymer.
• component (A-1) is preferably an (acrylates/stearyl methacrylate) copolymer or an (acrylates/beheneth methacrylate) copolymer, more preferably an (acrylates/beheneth methacrylate) copolymer, and even more preferably an (acrylates/beheneth-25 methacrylate) copolymer.
• An example of a commercially available product of acrylates/polyoxyethylene (20) methacrylate stearyl ether copolymer (acrylates/steareth-20 methacrylate copolymer) is the product name "Accurin (registered trademark) 22" (manufactured by Rohm and Haas Co.), and an example of a commercially available product of acrylates/polyoxyethylene (25) methacrylate behenyl ether copolymer (acrylates/beheneth-25 methacrylate copolymer) is the product name "Accurin 28" (manufactured by Rohm and Haas Co.) and the product name "NOVETHIX (registered trademark) L-10" (manufactured by Lubrizol Corporation).
• Component (A-1) can usually be neutralized with a basic substance before use.
• basic substances include alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, isopropanolamine, diisopropanolamine, and triisopropanolamine; inorganic bases such as sodium hydroxide, potassium hydroxide, and magnesium hydroxide; and basic amino acids such as L-arginine.
• alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, isopropanolamine, diisopropanolamine, and triisopropanolamine
• inorganic bases such as sodium hydroxide, potassium hydroxide, and magnesium hydroxide
• basic amino acids such as L-arginine.
• Component (A-2) is a copolymer containing acrylodimethyltaurine as a constituent unit, and examples thereof include a copolymer of an acrylate and an acryloyldimethyltaurate, a copolymer of hydroxyethyl acrylate and an acryloyldimethyltaurate, a copolymer of acrylic acid, an acrylate, an acrylamide and an acryloyldimethyltaurate, etc.
• a copolymer of an acrylate and an acryloyldimethyltaurate it is preferable to use a copolymer of hydroxyethyl acrylate and acryloyldimethyltaurate.
• an example of a copolymer of an acrylate and an acrylodimethyltaurate is (sodium acrylate/sodium acryloyldimethyltaurate) copolymer
• an example of a copolymer of hydroxyethyl acrylate and an acryloyldimethyltaurate is (hydroxyethyl acrylate/sodium acryloyldimethyltaurate) copolymer.
• component (A-1) and (A-2) may be used alone as component (A), but it is preferable to use them in combination.
• component (A-1) in combination with a copolymer of hydroxyethyl acrylate and acryloyldimethyl taurate as (A-2), it is possible to obtain a more excellent effect in terms of cosmetic durability.
• the content of component (A) in the oil-in-water emulsion cosmetic is not particularly limited, but the lower limit is preferably 0.05% or more, more preferably 0.2% or more, and even more preferably 0.3% or more.
• the upper limit is preferably 3% or less, more preferably 2% or less, and even more preferably 1% or less.
• the range is preferably 0.05 to 3%, more preferably 0.2 to 2%, and even more preferably 0.3 to 1% or less.
• the mass ratio of component (A-2) to component (A-1) (component (A-2)/component (A-1)) is preferably 1 or more, more preferably 2 or more, and even more preferably 4 or more, as a lower limit.
• the upper limit is preferably 10 or less, more preferably 8 or less, and even more preferably 6 or less.
• the range is preferably 1 to 10, more preferably 2 to 8, and even more preferably 4 to 6.
• the oil-in-water emulsion cosmetic of the present invention contains a branched polysaccharide.
• polysaccharide refers to a saccharide in which 10 or more monosaccharides, such as glucose, mannose, galactose, glucuronic acid, etc., are bonded together.
• polysaccharides having branched chains include succinoglucan, which has a structure in which glucose and galactose form the main chain and succinic acid and pyruvic acid form the branched chains, Tremella fuciformis polysaccharide, which has a structure in which mannose forms the main chain and fucose, xylose, and glucuronic acid form the branched chains, gum arabic, which has a structure in which galactose forms the main chain and galactose, arabinose, rhamnose, and glucuronic acid form the branched chains, locust bean gum, which has a structure in which mannose forms the main chain and galactose forms the branched chains, carrageenan, which has a structure in which D-galactose alternately repeats ⁇ -1,3 bonds or ⁇ -1,4 bonds, and xanthan gum, which has a structure in which glucose forms the main chain and mannose and glucuronic acid form the branched
• Tremella fuciformis polysaccharide and xanthan gum are preferred from the viewpoints of stability against temperature changes and cosmetic durability, and specifically Tremella fuciformis polysaccharide and xanthan gum are preferred.
• Examples of commercially available Tremella fuciformis polysaccharides include those under the trade names "TREMOIST-TP”, “TREMOIST-SL”, and “TREMOIST-SLB” (all manufactured by Nippon Fine Chemicals Co., Ltd.).
• the above branched polysaccharides may be used alone or in combination of two or more types.
• the content of component (B) in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, but the lower limit is preferably 0.005% or more, more preferably 0.01% or more, and even more preferably 0.05% or more.
• the upper limit is preferably 2% or less, more preferably 1% or less, and even more preferably 0.5% or less.
• the range is preferably 0.005 to 2%, more preferably 0.01 to 1%, and even more preferably 0.05 to 0.5%.
• the oil-in-water emulsion cosmetic of the present invention contains, as (C) an oil that is liquid at 25° C., one or more oils selected from the group consisting of (C-1) ester oils, (C-2) hydrocarbon oils, and (C-3) higher alcohols.
• oil at 25° C. refers to an oil having a viscosity of 7,000 mPa ⁇ s or less when measured at 25° C. and 1 atmospheric pressure using a B-type viscometer (rotor No. 2).
• the component (C-1) is an ester of a straight-chain or branched-chain fatty acid and a straight-chain or branched-chain monohydric or polyhydric alcohol.
• the component (C-1) is not particularly limited as long as it is an ester oil that is liquid at 25°C, and examples thereof include jojoba oil, alkyl benzoate (C12-C15), cetyl 2-ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, isotridecyl isononanoate, ethyl oleate, glyceryl tri-2-ethylhexanoate, propylene glycol dicaprate, neopentyl glycol dicaprate, polyglyceryl-2 triisostearate,
• alkyl benzoate (C12-15), diisopropyl sebacate, cetyl 2-ethylhexanoate, ethyl oleate, isononyl isononanoate, and isopropyl myristate are preferred, and alkyl benzoate (C12-15) and diisopropyl sebacate are more preferred.
• the above ester oils may be used alone or in combination of two or more, and it is preferred to use cetyl 2-ethylhexanoate in combination with alkyl benzoate (C12-15) or diisopropyl sebacate.
• the component (C-2) is not particularly limited as long as it is a hydrocarbon oil that is liquid at 25°C, and examples thereof include liquid paraffin, hydrogenated polyisobutene, squalane, squalene, liquid isoparaffin, A-olefin oligomer, isododecane, isohexadecane, undecane, hydrogenated farnesene (hemisqualane), and tridecane. Among these, squalane and isodecane are preferred from the viewpoint of stability against temperature changes.
• the above-mentioned hydrocarbon oils may be used alone or in combination of two or more.
• the presence or absence of a volatile hydrocarbon oil is not particularly limited, but it is preferable to include a volatile hydrocarbon oil.
• Volatile refers to a hydrocarbon oil having a boiling point of 260°C or less at normal pressure. One or more types may be used in combination as necessary.
• the amount of the volatile hydrocarbon oil is preferably 4% or less as an upper limit, but is not particularly limited.
• Component (C-3) is not particularly limited as long as it is a higher alcohol that is liquid at 25°C, but branched or unsaturated higher alcohols having 12 to 24 carbon atoms are preferred, such as hexyldecanol, isostearyl alcohol, octyldodecanol, decyltetradecanol, and oleyl alcohol. Among these, from the viewpoint of stability against temperature changes, etc., octyldodecanol, decyltetradecanol, and isostearyl alcohol are preferred, and octyldodecanol is more preferred.
• the above higher alcohols may be used alone or in combination of two or more.
• any of components (C-1) to (C-3) may be used alone, but by using them in combination, the stability against temperature changes and the cosmetic durability can be further improved.
• component (C-1) in combination with component (C-2) or (C-3).
• the content of component (C) in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, but the lower limit is preferably 1.5% or more, more preferably 2.5% or more, and even more preferably 3.5% or more.
• the upper limit is preferably 25% or less, more preferably 20% or less, and even more preferably 15% or less.
• the range is preferably 1.5 to 25%, more preferably 2.5 to 20%, and even more preferably 3.5 to 15%.
• the oil-in-water emulsion cosmetic of the present invention contains 7 to 25% of a hydrophobic treated metal oxide.
• metal oxides used in the present invention include zinc oxide, iron oxide, titanium oxide, zirconium oxide, cerium oxide, and chromium oxide. Among these, it is preferable to use zinc oxide, iron oxide, and titanium oxide from the viewpoint of ultraviolet protection effect, etc.
• the above metal oxides may be used alone or in combination of two or more kinds.
• the average particle size of the metal oxide is not particularly limited. From the viewpoint of UV protection effect and dispersibility, it is preferably 0.001 ⁇ m to 1 ⁇ m, more preferably 0.002 ⁇ m to 0.1 ⁇ m, and even more preferably 0.0025 ⁇ m to 0.05 ⁇ m. From the viewpoint of cosmetic effect, it is preferably 0.05 ⁇ m to 5 ⁇ m, more preferably 0.1 ⁇ m to 2.5 ⁇ m, and even more preferably 0.2 ⁇ m to 0.5 ⁇ m.
• the average particle size of the metal oxide can be measured by image analysis of a transmission electron microscope image. Specifically, about 10 mg of the sample is thoroughly dispersed in 1-propanol on a glass slide to obtain a dispersion. The dispersion is stretched to obtain a thin-film sample. The thin film of the sample is placed on a mesh for transmission electron microscope (TEM) measurement with a support film attached. The mesh (dried coating film) is set in a transmission electron microscope device (e.g., model number: S-4800, Hitachi High-Technologies Corporation) and observed to obtain an image of the dried coating film in which individual particles are reflected.
• TEM transmission electron microscope
• the image of this dried coating film surface image is processed by an image analysis type particle size distribution measurement device (e.g., model number: MAC-VIEW, Mountec Co., Ltd.) with 1,000 particles measured, and the particle size is measured.
• an image analysis type particle size distribution measurement device e.g., model number: MAC-VIEW, Mountec Co., Ltd.
• the average particle size D50 of the sample (powder) can be obtained by image analysis of the transmission electron microscope (TEM) image.
• the shape of the metal oxide is not particularly limited, but examples include granular, spherical, plate-like, spindle-like, dendritic, and balloon-like shapes. Among these, granular, spherical, plate-like, and spindle-like shapes are preferred from the viewpoint of UV protection effect.
• the metal oxide may be partially or completely surface-treated with an inorganic compound such as aluminum hydroxide, hydrated silica, or alumina.
• the hydrophobic treatment for the metal oxide is not particularly limited, and examples thereof include silicone treatment, alkylalkoxysilane treatment, organic titanate treatment, amino acid treatment, acylated amino acid treatment, fatty acid treatment, fatty acid ester treatment, phospholipid treatment, polyalkylene oxide treatment, and ceramide treatment, and the like, and the metal oxide may be treated with one or more of these.
• silicone treatment, alkylalkoxysilane treatment, amino acid treatment, acylated amino acid treatment, fatty acid treatment, fatty acid ester treatment, and phospholipid treatment are preferred.
• the hydrophobic treatments that have been compositely treated on the same metal oxide, or to contain two or more hydrophobic treated metal oxides that have been subjected to different hydrophobic treatments.
• the latter particularly preferably contains (D-1) a metal oxide treated with a silicone and/or alkylalkoxysilane, and (D-2) one or more metal oxides selected from the group consisting of an amino acid treatment, an acylated amino acid treatment, a fatty acid treatment, a fatty acid ester treatment, and a phospholipid treatment, and the use of two or more of these in combination is more preferable.
• silicone treatments include methylhydrogenpolysiloxane treatment and dimethylpolysiloxane treatment.
• alkylalkoxysilane treatment is triethoxycaprylylsilane treatment.
• amino acid treatments include proline treatment, hydroxyproline treatment, alanine treatment, glycine treatment, lysine treatment, aspartic acid treatment, glutamic acid treatment, theanine treatment, or salt treatments of these.
• Examples of amination and acylation treatments include lauroyl lysine treatment, sodium dilauroyl glutamate lysine treatment (sodium dilauramidoglutamate lysine treatment), disodium stearoyl glutamate treatment, and sodium lauroyl aspartate treatment.
• fatty acid treatments include fatty acids or their metal salts, with fatty acids having 12 to 18 carbon atoms being preferred.
• salts include calcium, magnesium, zinc, and aluminum, with aluminum salts being preferred. Among these, isostearic acid treatment, stearic acid treatment, or salt treatments of these acids are more preferred.
• fatty acid ester treatment examples include esters of fatty acids and polyhydric alcohols, such as pentaerythritol fatty acid ester treatment, trimethylolpropane fatty acid ester treatment, glycerin fatty acid ester treatment, and polyglycerin fatty acid ester treatment.
• the fatty acid is not particularly limited, whether it is branched or straight-chain, saturated or unsaturated.
• the fatty acid ester treatment is preferably one in which all of the polyhydric alcohols and hydroxyl groups are esterified with fatty acids. Of the fatty acids, fatty acids having 8 to 18 carbon atoms are preferred.
• pentaerythritol fatty acid ester treatment examples include pentaerythrityl tetraethylhexanoate, pentaerythrityl tetramyristate, pentaerythrityl tetraisostearate, dipentaerythrityl hexaisononanoate, etc.
• trimethylolpropane fatty acid ester treatment examples include trimethylolpropane triisostearate, trimethylolpropane tri-2-ethylhexanoate, etc.
• glycerin fatty acid ester treatment examples include glycerin triisopalmitate, glyceryl tri(caprylic acid/capric acid), glycerin triethylhexanoate, etc.
• polyglycerin fatty acid ester treatments include polyglyceryl-6 octacaprylate treatment, polyglyceryl-6 octastearate treatment, polyglyceryl-2 tetraisostearate treatment, polyglyceryl-2 triisostearate treatment, polyglyceryl-10 decaisostearate treatment, polyglyceryl-10 decaethylhexanoate treatment, polyglyceryl-10 pentaisostearate treatment, polyglyceryl-10 pentaoleate treatment, polyglyceryl-10 pentastearate treatment, and deca(erucic acid/isostearic acid/ricinoleic acid)polyglyceryl-8 treatment.
• glycerin fatty acid ester treatment and polyglycerin fatty acid ester treatment are preferred.
• its degree of polymerization is not particularly limited, but is preferably 2 or more and 10 or less. More preferred are polyglyceryl-2 tetraisostearate-treated and polyglyceryl-2 triisostearate-treated, and even more preferred are polyglyceryl-2 tetraisostearate-treated.
• phospholipid treatment examples include naturally derived phospholipids, specifically soybean-derived phospholipids, egg yolk-derived phospholipids, sunflower phospholipids, and hydrogenated phospholipids, lysophospholipids, hydrogenated lysophospholipids, and the like, which are processed from these.
• the alcohols that make up phospholipids often contain nitrogen, and examples include choline, ethanolamine, inositol, and serine. Soybean-derived phospholipids are preferred. Examples include lecithin treatment and hydrogenated lecithin treatment. Furthermore, hydrogenated phospholipids are more preferred.
• the method of hydrophobizing the metal oxide is not particularly limited, and can be produced by a known method.
• a hydrophobizing agent and powder particles to be treated are added to a solvent, and the mixture is stirred in a ball mill or the like, and then dried as necessary, washed with water, and filtered repeatedly to remove impurities, and then dried and pulverized to obtain the desired hydrophobized powder.
• the surface can be simultaneously treated with several kinds of compounds that are hydrophobizing agents, or the surface can be pre-treated with any one of the compounds and then further treated with another compound, thereby performing hydrophobizing treatments with a plurality of hydrophobizing agents.
• the amount of hydrophobizing agent applied to the metal oxide is not particularly limited, but is preferably 1-7% of the metal oxide, more preferably 1-5%, and even more preferably 1-4%.
• the content of component (D) in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, but the lower limit is preferably 7% or more, more preferably 9% or more, and even more preferably 14% or more.
• the upper limit is preferably 25% or less, more preferably 23% or less, and even more preferably 20% or less.
• the range is preferably 7 to 25%, more preferably 9 to 23%, and even more preferably 14 to 20%.
• the mass ratio of component (D) to the total content of component (A) and component (B) is preferably 5 or more as a lower limit, more preferably 10 or more, even more preferably 15 or more, and particularly preferably 20 or more, from the viewpoint of stability against temperature changes, etc.
• the upper limit is preferably 85 or less, more preferably 70 or less, even more preferably 60 or less, and particularly preferably 50 or less.
• the range is preferably 5 to 85, more preferably 10 to 70, even more preferably 15 to 60, and particularly preferably 20 to 50.
• the oil-in-water emulsion cosmetic of the present invention contains, as component (E), one or more components selected from the group consisting of component (E-1) an acrylic-silicone graft copolymer, (E-2) polyhydroxystearic acid, and (E-3) a polyglycerin-alkyl-comodified silicone.
• component (E) one or more components selected from the group consisting of component (E-1) an acrylic-silicone graft copolymer, (E-2) polyhydroxystearic acid, and (E-3) a polyglycerin-alkyl-comodified silicone.
• the component (E-1) acrylic-silicone graft copolymer used in the present invention has the characteristics of both an acrylic acid group and a dimethylpolysiloxane group.
• the structure of these is not particularly limited, and may be a graft copolymer having a dimethylpolysiloxane group as the main chain and an acrylic acid group on the side chain, a linear block copolymer or crosslinked polymer in which dimethylpolysiloxane groups and acrylic acid groups are alternately bonded, or a polymer having an acrylic acid main chain and a dimethylpolysiloxane group on the side chain.
• the dimethylpolysiloxane group may be linear or have a branched structure, or may be one that has been co-modified with an organic group such as an alkyl group.
• acrylic-silicone graft copolymer examples include (acrylates/dimethicone) copolymer, (acrylates/stearyl acrylate/dimethicone methacrylate) copolymer, (acrylates/ethylhexyl acrylate/dimethicone methacrylate) copolymer, and (acrylates/behenyl acrylate/dimethicone methacrylate) copolymer.
• (acrylates/ethylhexyl acrylate/dimethicone methacrylate) copolymer is preferred from the standpoint of stability against temperature changes, etc.
• Component (E-2) Component (E-2) polyhydroxystearic acid used in the present invention is a polymerized form of 12-hydroxystearic acid.
• degree of polymerization There are no particular limitations on the degree of polymerization, but the lower limit is preferably 4 or more, and more preferably 6 or more.
• the upper limit of the degree of polymerization is preferably 10 or less.
• the range of the degree of polymerization is preferably 4 to 10, and more preferably 6 to 10. By being within the above range, the dispersibility of component (D) and other powders contained in the oil-in-water emulsion cosmetic of the present invention in the oil phase is improved.
• the polyglycerin-alkyl co-modified silicone, component (E-3) used in the present invention is a copolymer having a silicone chain and a polyglyceryl group, in which an alkyl group has been introduced into the side chain or terminal.
• the alkyl group preferably has a linear or branched carbon number of 6 to 20, and more preferably has a linear or branched carbon number of 10 to 20.
• the polyglycerin-alkyl co-modified silicone also includes those in which a silicone dendron group has been further introduced into the side chain or terminal.
• polyglycerin/alkyl-modified silicones examples include lauryl polyglyceryl-3 polydimethylsiloxyethyl dimethicone and cetyl diglyceryl tris(trimethylsiloxy)silylethyl dimethicone.
• cetyl diglyceryl tris(trimethylsiloxy)silylethyl dimethicone is preferred from the standpoint of stability against temperature changes.
• the content of component (E) in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, but from the viewpoint of cosmetic durability, etc., the lower limit is preferably 0.05% or more, more preferably 0.1% or more, and even more preferably 0.3% or more.
• the upper limit is preferably 5% or less, more preferably 3% or less, and even more preferably 1% or less.
• the range is preferably 0.05 to 5%, more preferably 0.1 to 3%, and even more preferably 0.3 to 1%.
• the mass ratio of component (E) to component (D) is preferably 0.005 or more as a lower limit, more preferably 0.01 or more, even more preferably 0.015 or more, and particularly preferably 0.02 or more, from the viewpoints of stability against temperature changes, cosmetic durability, etc.
• the upper limit is preferably 0.25 or less, more preferably 0.15 or less, even more preferably 0.1 or less, and particularly preferably 0.05 or less.
• the range is preferably 0.005 to 0.25, more preferably 0.01 to 0.15, even more preferably 0.015 to 0.1, and particularly preferably 0.02 to 0.05.
• the oil-in-water emulsion cosmetic of the present invention preferably further contains component (F) a glittering powder.
• the component (F) glittering powder is not particularly limited, and examples thereof include glass powders such as titanium mica, bismuth oxychloride, organic pigment-treated titanium mica, titanium dioxide-coated mica, titanium dioxide-coated synthetic phlogopite, titanium dioxide-coated bismuth oxychloride, iron oxide mica titanium, Prussian blue-treated titanium mica, carmine-treated titanium mica, fish scale foil, and titanium dioxide-coated glass powder; glittering pigments such as titanium oxide-coated synthetic phlogopite, resin laminate powders such as polyethylene terephthalate-aluminum-epoxy laminate powder, polyethylene terephthalate-aluminum laminate powder, polyethylene terephthalate-polyolefin laminate film powder, and polyethylene terephthalate-polymethyl methacrylate laminate film powder; metal powders such as aluminum powder, gold powder, and silver powder; and composite powders such as fine particle titanium oxide-coated mica titanium, fine particle zinc oxide-coated mica titanium, bar
• the average particle size of the glittering powder is preferably 1 ⁇ m or more as a lower limit, more preferably 3 ⁇ m or more, and even more preferably 5 ⁇ m or more.
• the upper limit is preferably 50 ⁇ m or less, more preferably 30 ⁇ m or less, and even more preferably 15 ⁇ m or less.
• the range is preferably 1 to 50 ⁇ m, more preferably 3 to 30 ⁇ m, and even more preferably 5 to 15 ⁇ m.
• the average particle size of the glittering powder can be measured by image analysis of transmission electron microscope images, similar to the above-mentioned component (D).
• the shape of the glittering powder is not particularly limited, but examples include granular, spherical, and plate-like shapes.
• the content of component (F) in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, but the lower limit is preferably 0.1% or more, more preferably 0.3% or more, and even more preferably 0.5% or more.
• the upper limit is preferably 5% or less, more preferably 4% or less, and even more preferably 3% or less.
• the range is preferably 0.1 to 5%, more preferably 0.3 to 4%, and even more preferably 0.5 to 3%.
• the oil-in-water emulsion cosmetic of the present invention further contains, as component (G), component (G-1) a silicone-based oil phase thickener or component (G-2) a silicone-based film-forming agent.
• the silicone-based oil phase thickener, component (G-1), used in the present invention is an oil phase thickener having a silicone skeleton in the main chain or side chain.
• silicone-based oil phase thickeners include, but are not limited to, dimethicone crosspolymer, (dimethicone/vinyl dimethicone) crosspolymer, (dimethicone/phenylvinyl dimethicone) crosspolymer, (vinyl dimethicone/lauryl dimethicone) crosspolymer, and (dimethicone/vinyl trimethylsiloxysilicate) crosspolymer.
• dimethicone crosspolymer dimethicone/vinyl dimethicone
• silicone-based oil phase thickeners include, but are not limited to, dimethicone crosspolymer, (dimethicone/vinyl dimethicone) crosspolymer, (
• the silicone-based film-forming agent, component (G-2), used in the present invention is a film-forming polymer having a silicone skeleton in the main chain or side chain.
• the silicone film-forming agent is not particularly limited, but may be a compound having a structure represented by the following average formula (1): R1 n SiO (4-n)/2 ...Average formula (1)
• R1 in the silicone resin is independently a group selected from an alkyl group having 1 to 8 carbon atoms or an aryl group having 6 to 12 carbon atoms.
• Trimethylsiloxysilicate is commercially available under the trade names, for example, "Silicon X-21-5250" (50% decamethylcyclopentasiloxane solution), “Silicon X-21-5250L” (50% volatile dimethicone solution), “KF-7312T” (60% methyltrimethicone solution), “KF-7312J” (50% decamethylcyclopentasiloxane solution), “KF-7312K” (60% dimethicone solution), and “KF-731
• dimethicone compounds include “KF-9021” (50% volatile dimethicone solution), “KF-9021” (50% decamethylcyclopentasiloxane solution), “KF-9021L” (50% volatile dimethicone solution) (all manufactured by Shin-Etsu Chemical Co., Ltd.), “SR1000” (100% purity), “SS4267” (35% dimethicone solution), and “SILSOFT74” (75% isodo
• the content of component (G) in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, but the lower limit is preferably 0.01% or more, more preferably 0.05% or more, and even more preferably 0.1% or more.
• the upper limit is preferably 2% or less, more preferably 1% or less, and even more preferably 0.75% or less.
• the range is preferably 0.01 to 2%, more preferably 0.05 to 1%, and even more preferably 0.1 to 0.75%.
• the oil-in-water emulsion cosmetic of the present invention preferably further contains zeolite as component (H).
• zeolites include A-type zeolite, X-type zeolite, Y-type zeolite, mordenite, ferrierite, beta type, ZSM-5, etc.
• Commercially available products such as "Zeolum A3", “Zeolum A4", and “Zeolum A5" (all manufactured by Tosoh Corporation) are preferably used.
• the content of component (H) in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, but is preferably 0.01 to 1%, more preferably 0.02 to 1%, and even more preferably 0.02 to 0.5%.
• the oil-in-water emulsion cosmetic of the present invention further contains, as component (I), a nonionic surfactant having an HLB value of 12.0 to 16.0.
• the nonionic surfactant having an HLB value of 12.0 to 16.0, component (I) used in the present invention is not particularly limited, and examples thereof include sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters, ethylene oxide derivatives of glycerin fatty acid esters, propylene glycol fatty acid esters, ethylene oxide derivatives of propylene glycol fatty acid esters, polyethylene glycol fatty acid esters, sucrose fatty acid esters, polyoxyethylene alkyl ethers, polyoxypropylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene castor oil derivatives, polyoxyethylene phytostanol ethers, polyoxyethylene phytosterol ethers, polyoxyethylene cholestanol ethers, polyoxyethylene cholesterol ethers, polyoxyethylene cholesteryl ethers, polyoxyalkylene-modified organopoly
• component (I) is not particularly limited, but is preferably 0.001 to 10%, more preferably 0.01 to 5%, and even more preferably 0.01 to 1%.
• the oil-in-water emulsion cosmetic of the present invention preferably does not substantially contain linear saturated higher aliphatic alcohols and linear saturated higher fatty acids that are solid at 25°C. This makes it possible to further suppress viscosity changes under high temperature conditions, for example, 40°C or higher. In addition, it makes it possible to further suppress gelation under low temperature conditions, for example, 5°C or lower.
• substantially free of linear saturated higher fatty alcohols and linear saturated higher fatty acids means that the content of linear saturated higher fatty alcohols and linear saturated higher fatty acids that are solid at 25°C in the oil-in-water emulsion cosmetic is 1% or less, preferably 0.5% or less, more preferably 0.3% or less, even more preferably 0.1% by mass or less, and particularly preferably 0% (not contained).
• linear saturated fatty alcohols examples include stearyl alcohol, cetanol, myristyl alcohol, cetearyl alcohol, cetostearyl alcohol, arachidyl alcohol, and behenyl alcohol.
• linear saturated higher fatty acids examples include lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, and montanic acid.
• the viscosity of the oil-in-water emulsion cosmetic according to the present invention is not particularly limited and may be set as appropriate, but for example, when left to stand at 30°C for 24 hours (viscosity the day after storage at a constant temperature of 30°C), the upper limit is preferably 80,000 mPa ⁇ s or less, more preferably 60,000 mPa ⁇ s or less, and even more preferably 40,000 mPa ⁇ s or less.
• the lower limit is preferably 20,000 mPa ⁇ s or more, more preferably 25,000 mPa ⁇ s or more, and even more preferably 30,000 mPa ⁇ s or more.
• the range is preferably 20,000 to 80,000 mPa ⁇ s, more preferably 25,000 to 60,000 mPa ⁇ s, and even more preferably 30,000 to 40,000 mPa ⁇ s.
• the upper limit is preferably 45,000 mPa ⁇ s or less, more preferably 40,000 mPa ⁇ s or less, and even more preferably 35,000 mPa ⁇ s or less.
• the lower limit is preferably 10,000 mPa ⁇ s or more, more preferably 13,000 mPa ⁇ s or more, and even more preferably 16,000 mPa ⁇ s or more.
• the range is preferably 10,000 to 45,000 mPa ⁇ s, more preferably 13,000 to 40,000 mPa ⁇ s, and even more preferably 16,000 to 35,000 mPa ⁇ s.
• the upper limit is preferably 200,000 mPa ⁇ s or less, more preferably 150,000 mPa ⁇ s or less, and even more preferably 100,000 mPa ⁇ s or less.
• the lower limit is preferably 35,000 mPa ⁇ s or more, more preferably 37,000 mPa ⁇ s or more, and even more preferably 40,000 mPa ⁇ s or more.
• the range is preferably 35,000 to 200,000 mPa ⁇ s, more preferably 37,000 to 150,000 mPa ⁇ s, and even more preferably 40,000 to 100,000 mPa ⁇ s.
• the viscosity of the oil-in-water emulsion cosmetic is a measured value obtained using a B-type rotational viscometer (manufactured by Brookfield).
• the oil-in-water emulsion cosmetic of the present invention may contain optional ingredients other than those mentioned above, so long as the ingredients do not impair the effects of the present invention.
• optional ingredients include surfactants, UV absorbers, antioxidants, moisturizers, thickeners, preservatives, pH adjusters, antibacterial agents, chelating agents, plant extracts, vitamins, and fragrances.
• the oil-in-water emulsion cosmetic of the present invention may be in the form of, for example, a liquid, gel, emulsion, cream, paste, or solid.
• the oil-in-water emulsion cosmetic of the present invention can be used, for example, in hair cosmetics such as shampoos, rinses, and conditioners, facial cleansing cosmetics, sunscreen cosmetics, and makeup cosmetics such as foundations, makeup bases, eye shadows, lipsticks, and lip glosses. Of these, it is preferable to use it in sunscreen cosmetics and makeup cosmetics.
• the method for producing the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and it can be produced by mixing the above essential components and optional components according to a conventional method.
• the component (A), the component (B), and water are mixed while heating to 70 to 80°C to prepare an aqueous phase, and the component (C), the component (D), and the component (E) are mixed to prepare an oil phase, and then these are mixed until uniform at 70 to 80°C and cooled to obtain the oil-in-water emulsion cosmetic of the present invention.
• the component (D) may be partially contained in the aqueous phase, and the phase to which it is added is not particularly limited, but it is preferable to add it to both the oil phase and the aqueous phase from the viewpoint of stability against temperature changes.
• the oil phase contains a component (D) having an average particle size of 0.001 ⁇ m to 1 ⁇ m, and it is preferable that the oil phase and/or the aqueous phase contain a component (D) having an average particle size of 0.05 ⁇ m to 5 ⁇ m, but this is not particularly limited.
• component (D) or component (F) in the oil phase is 0.2 ⁇ m or less, and the total average particle size of component (D) or component (F) in the aqueous phase is 0.2 ⁇ m or more.
• component (F) it is preferable to mix it in the aqueous phase.
• the oil-in-water emulsion composition of the present invention obtained as described above can be filled in various forms such as bottles, jars, tubes, and dispensers.
• a series of operations is required in which a certain amount of cosmetic is discharged by applying an appropriate load by pressing, etc., and the discharge stops when the load is released.
• the viscosity of the cosmetic contained in the container is too high, it is difficult to press and excessive force is required for discharge.
• the viscosity is too low, the cosmetic is discharged in excess when pressed and drips from the hand when discharged, and the viscosity has a large effect on usability.
• the cosmetic contained therein is required to have a low temperature sensitivity of viscosity and a performance in which the viscosity is not easily changed even at high and low temperatures.
• the oil-in-water emulsion composition of the present invention has excellent viscosity stability against temperature changes, and is suitable for storage in tube containers or dispenser containers because dripping and reduced dischargeability are unlikely to occur when stored in a tube container with a discharge port diameter of 1.5 to 2 mm, for example.
• the present invention can also employ the following configuration.
• the oil-in-water emulsion cosmetic contains: (A) one or more selected from the group consisting of (meth)acrylic acid or a copolymer of a (meth)acrylic acid alkyl ester and (meth)acrylic acid (polyoxyethylene monoalkyl ether), and a copolymer containing acryloyldimethyltaurine as a structural unit or a salt thereof; (B) a branched polysaccharide; (C) one or more liquid oils at 25° C.
• ⁇ 3> The oil-in-water emulsion cosmetic according to ⁇ 1> or ⁇ 2>, wherein the viscosity ratio of the viscosity (mPa ⁇ s) at 5°C to the viscosity (mPa ⁇ s) at 40°C of the oil-in-water emulsion cosmetic (viscosity at 5°C/viscosity at 40°C) is 1.0 to 7.0.
• ⁇ 4> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 3>, wherein a content mass ratio of component (D) to a total content of component (A) and component (B) (component (D)/(component (A)+component (B))) is 10 to 85.
• ⁇ 5> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 4>, wherein the component (B) is a polysaccharide having mannose and/or glucuronic acid as a constituent unit.
• the ester oil of component (C) is one or more selected from the group consisting of alkyl benzoate (C12-C15), diisopropyl sebacate, and cetyl 2-ethylhexanoate.
• ⁇ 7> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 6>, wherein the hydrocarbon oil of the component (C) contains a volatile hydrocarbon oil.
• the hydrophobization treatment of component (D) is one or more treatments selected from the group consisting of silicone treatment, alkylalkoxysilane treatment, amino acid treatment, acylated amino acid treatment, fatty acid treatment, fatty acid ester treatment, and phospholipid treatment.
• the oil-in-water emulsion cosmetic according to ⁇ 10> containing, as component (D), (D-1) a silicone-treated and/or alkylalkoxysilane-treated metal oxide, and (D-2) one or more kinds of metal oxides selected from the group consisting of an amino acid-treated metal oxide, an acylated amino acid-treated metal oxide, a fatty acid-treated metal oxide, a fatty acid ester-treated metal oxide, and a phospholipid-treated metal oxide.
• component (D) containing, as component (D), (D-1) a silicone-treated and/or alkylalkoxysilane-treated metal oxide, and (D-2) one or more kinds of metal oxides selected from the group consisting of an amino acid-treated metal oxide, an acylated amino acid-treated metal oxide, a fatty acid-treated metal oxide, a fatty acid ester-treated metal oxide, and a phospholipid-treated metal oxide.
• ⁇ 12> The oil-in-water emulsion cosmetic
• ⁇ 13> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 12>, further comprising a glittering powder as a component (F).
• ⁇ 14> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 13>, further comprising a component (G) a silicone-based oil phase thickener and/or a silicone-based film-forming agent.
• ⁇ 15> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 14>, further comprising one or more nonionic surfactants having an HLB value of 12.0 to 16.0 other than the component (E).
• ⁇ 16> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 15>, wherein the viscosity of the oil-in-water emulsion cosmetic the next day after storage at 40° C. is 10,000 mPa ⁇ s or more.
• ⁇ 17> The oil-in-water emulsion cosmetic according to any one of ⁇ 1> to ⁇ 16>, wherein the oil-in-water emulsion cosmetic is a sunscreen cosmetic or a makeup cosmetic.
• Oil-in-water emulsion cosmetics having the formulations shown in Tables 1 to 6 were produced by the preparation methods shown below. The obtained oil-in-water emulsion cosmetics were evaluated for (1) viscosity, (2) stability against temperature changes, and (3) cosmetic durability by the methods described below. The results are shown in Tables 1 to 6.
• Viscosity The oil-in-water emulsion composition obtained above was filled into a 60 ml glass standard bottle and allowed to stand for 24 hours in thermostatic baths set at 5° C., 30° C., and 40° C. After standing, the viscosity of the oil-in-water emulsion cosmetic was measured using a B-type rotational viscometer (manufactured by Brookfield). The viscosity measurement was performed using a rotor No. 4 at a rotation speed of 6 rpm for a measurement time of 1 minute.
• Method of preparing powder foundation A. Components 1 to 12 were mixed uniformly in a super mixer. B. A homogeneous mixture of ingredients 13 to 16 was added to A, uniformly dispersed, and crushed. C. B was filled into a container and compression molded to obtain a powder foundation.
• Example 11 which contains isododecane, a volatile hydrocarbon oil, in component (C), was even more excellent in makeup durability than Example 1.
• the average score for the evaluation of makeup durability of Example 11 was 9.75 points, which was slightly better than Example 1 (average score 9.60).
• Example 21 which contains two or more hydrophobized metal oxides with different hydrophobization treatments in component (D), was superior in stability against temperature changes and in makeup durability.
• Example 21 The average score for the evaluation of makeup durability of Example 21 was 9.70 points, which was slightly better than Example 1 (average score 9.60).
• Comparative Example 1 which did not contain component (A) and was replaced with an (acrylates/alkyl acrylate (C10-30)) crosspolymer, had insufficient cosmetic durability.
• Comparative Example 2 which did not contain component (B) and instead contained hydroxypropylmethylcellulose, a straight-chain water-soluble polymer, showed insufficient makeup durability.
• Comparative Example 3 which did not contain component (D), had insufficient cosmetic durability.
• Comparative Example 4 which contained 30% or more of component (D), the stability against temperature changes could not be evaluated due to poor emulsification.
• Comparative Example 5 which did not contain component (E), had poor dispersibility of component (D) and insufficient cosmetic durability.
• Example 34 Daytime Beauty Serum A daytime beauty serum was prepared using the composition shown in Table 8 and the manufacturing method described below.
• F. 28 to 31 were added to E, cooled to 30° C., taken out, degassed, and filled into a tube container to obtain a daytime beauty essence.
• Example 35 Sunscreen A sunscreen was prepared using the composition shown in Table 9 and the manufacturing method described below.
• Process 16-22 on a triple roller mill to obtain a dispersion C. Mix B with 7 to 15 and heat to 70°C. D. Add C to A and emulsify with a stirrer at 3,000 rpm for 5 minutes using a disperser mixer. E. Cool D to 40°C. F. 23 to 29 were added to E, cooled to 30° C., taken out, degassed, and filled into a dispenser container to obtain a foundation.
• F. 21 to 26 were treated with a roller mill and added to F.E together with 27 to 30, cooled to 30° C., taken out, degassed and filled into a tube container to obtain a color correction cream.

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