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
  • 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
  • A61K8/36—Carboxylic acids; Salts or anhydrides thereof
  • A61K8/365—Hydroxycarboxylic acids; Ketocarboxylic 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
  • A61K8/30—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
  • A61K8/84—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

Definitions

• the present invention relates to an oil-in-water emulsion composition, particularly a cosmetic composition.
• Patent Document 1 as an oil-in-water emulsified cosmetic containing an ultraviolet absorber and an ultraviolet scattering agent and having a high ultraviolet protection (SPF) and a unique fresh feeling in use, (A) 0.05 to (B) 5 to 40% by weight of oil; (C) 2.5 to 30% by weight of an ultraviolet scattering agent having a hydrophobic surface; and (D) an aqueous phase with low salt resistance.
• an oil-in-water emulsified cosmetic comprising a thickener and (C) an ultraviolet scattering agent dispersed in an oil phase.
• an ultraviolet scattering agent such as titanium oxide is generally dispersed in an oil component such as silicone oil in many cases.
• an ultraviolet protection effect it is desirable to increase the amount of the ultraviolet scattering agent and the ultraviolet absorber, which is a polar oil.
• the amount of oil for example, the amount of oil such as silicone oil or hydrocarbon oil
• the amount of active ingredients i.e., UV scattering agent and UV absorber
• the present invention is intended to improve the above circumstances, and the purpose thereof is to combine a fresh feeling of use and a high UV protection effect, and to make the whiteness derived from the UV scattering agent stand out after application to the skin.
• An object of the present invention is to provide an oil-in-water emulsified composition in which the problem of clogging is improved.
• An oil-in-water emulsion composition particularly a cosmetic composition, comprising the following components (a) to (c): (a) an ultraviolet scattering agent; (b) polyhydroxystearic acid, and (c) oil,
• the ultraviolet scattering agent is dispersed in the oil,
• the ultraviolet scattering agent is 50 parts by mass or more with respect to 100 parts by mass of the oil, and 55% by mass or more of the oil is a polar oil.
• an oil-in-water emulsified composition that has both a fresh feeling of use and a high UV protection effect, and that solves the problem of conspicuous whiteness derived from UV scattering agents after application to the skin. can provide.
• compositions of the present invention are An oil-in-water emulsion composition, particularly a cosmetic composition, comprising the following components (a) to (c): (a) an ultraviolet scattering agent; (b) polyhydroxystearic acid, and (c) oil,
• the UV scattering agent is dispersed in the oil,
• the ultraviolet scattering agent is 50 parts by mass or more with respect to 100 parts by mass of oil, and 55% by mass or more of the oil is polar oil. composition.
• composition of the present invention can exhibit the effect of the present invention by including this unique component.
• the present inventors decided to increase the proportion of the UV scattering agent in the oil containing a high proportion of polar oil. Tried.
• the use of such a composition causes a problem that the whiteness derived from the UV scattering agent becomes conspicuous after application to the skin.
• the present inventors diligently studied dispersants for various ultraviolet scattering agents. As a result, it was found that the use of polyhydroxystearic acid can improve the problem that the whiteness derived from the UV scattering agent becomes conspicuous on the skin after the composition is applied.
• the composition of the present invention contains an ultraviolet scattering agent.
• An ultraviolet scattering agent can provide an ultraviolet protection effect.
• the ultraviolet scattering agent is not particularly limited as long as it has an ultraviolet protection effect, and may be, for example, at least one selected from the group consisting of titanium oxide, zinc oxide, iron oxide, and cerium oxide. .
• the ultraviolet scattering agent may be one that has been subjected to hydrophobic treatment.
• the hydrophobization treatment may be performed using a known surface treatment agent capable of hydrophobizing the surface. Examples include fluorine compound treatment, silicone treatment, silicone resin treatment, pendant treatment, and silane coupling agent treatment. , titanium coupling agent treatment, oil treatment, N-acylated lysine treatment, polyacrylic acid treatment, metallic soap treatment, amino acid treatment, inorganic compound treatment, plasma treatment, mechanochemical treatment, silane compound treatment, silazane compound treatment, etc. be done. Among these treatments, treatment with silicone or silicone resin, treatment with silane compound or silazane compound, and treatment with metal soap such as aluminum isostearate are preferable from the viewpoint of dispersion stability.
• the ultraviolet scattering agent may be particulate, in which case the average primary particle size is not particularly limited, and may be, for example, 5 nm or more, 10 nm or more, or 15 nm or more, or 200 nm or less, 100 nm or less, or It may be 50 nm or less.
• the "average primary particle diameter" may be obtained, for example, as the projected area circle equivalent diameter of the primary particles in the SEM image.
• the shape of the ultraviolet scattering agent is not particularly limited, and examples thereof include spherical, plate-like, rod-like, spindle-like, needle-like, and irregular shapes.
• the ultraviolet scattering agent is dispersed in the oil content of the composition of the present invention, and is 50 parts by mass or more per 100 parts by mass of the oil content.
• the UV scattering agent is, for example, 50 parts by mass or more, 55 parts by mass or more, 60 parts by mass or more, 65 parts by mass or more, with respect to 100 parts by mass of oil. It may be at least 70 parts by mass, at least 70 parts by mass, at least 80 parts by mass, at least 85 parts by mass, at least 90 parts by mass, at least 95 parts by mass, or at least 100 parts by mass.
• the upper limit of the amount of the ultraviolet scattering agent dispersed in the oil is not particularly limited. you can be at least 70 parts by mass, at least 70 parts by mass, at least 80 parts by mass, at least 85 parts by mass, at least 90 parts by mass, at least 95 parts by mass, or at least 100 parts by mass.
• the upper limit of the amount of the ultraviolet scattering agent dispersed in the oil is not particularly limited. you can be at least 70 parts by mass
• the content of the ultraviolet scattering agent is not particularly limited, for example 5.0% by mass or more, 7.0% by mass or more, 10% by mass or more, 12% by mass or more, or 15% by mass % or more, and may be 30% by mass or less, or 20% by mass or less.
• the composition of the invention comprises polyhydroxystearic acid.
• Polyhydroxystearic acid mainly plays the role of uniformly dispersing the ultraviolet ray scattering agent in the oil.
• polyhydroxystearic acid a compound obtained by forming an ester bond with hydroxystearic acid to form an oligomer can be used, and a commercially available product can be used.
• the degree of polymerization of polyhydroxystearic acid is not particularly limited, and may be 4-8, for example.
• the content of polyhydroxystearic acid is not particularly limited, and may be appropriately adjusted according to the content of the ultraviolet ray scattering agent. More specifically, the content of polyhydroxystearic acid may be, for example, 0.1% by mass or more, 0.5% by mass or more, or 1.0% by mass or more, and 3.0% by mass or less, It may be 2.5 mass % or less, 2.0 mass % or less, or 1.5 mass % or less.
• the polyhydroxystearic acid is, for example, 3.0 parts by mass or more and 3 parts by mass with respect to 100 parts by mass of the UV scattering agent, from the viewpoint of improving the dispersibility of the UV scattering agent in oil. .5 parts by mass or more, 4.0 parts by mass or more, 4.5 parts by mass or more, 5.0 parts by mass or more, 5.5 parts by mass or more, 6.0 parts by mass or more, or 6.5 parts by mass or more Also, from the viewpoint of stability against emulsification, it may be 10 parts by mass or less, 9.0 parts by mass or less, or 8.0 parts by mass or less.
• composition of the present invention contains oil.
• the oil content is not particularly limited, and from the viewpoint of improving the fresh feeling of use, for example, 25% by mass or less, 23% by mass or less, 20% by mass or less, 19% by mass or less, or It may be 18% by mass or less, and from the viewpoint of dispersing the ultraviolet scattering agent or improving the content of the polar oil having an ultraviolet protection effect, for example, 10% by mass or more, or 15% by mass or more. good.
• oil includes polar oil.
• polar oil accounts for 55% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, and particularly preferably 85% by mass or more.
• the upper limit of the ratio of the polar oil to the oil content is not particularly limited, and for example, polar oil may account for 100% by mass of the oil content.
• polar oils include ester oils and UV absorbers.
• the polar oil preferably contains an ultraviolet absorber from the viewpoint of improving the ultraviolet protection effect while obtaining a fresh feeling of use.
• the ratio of the ultraviolet absorber contained in the polar oil is, for example, 40% by mass or more, preferably 50% by mass or more, and more preferably 60% by mass or more.
• it since it contains a larger amount of polar oil than conventional cosmetic compositions, it is possible to stably incorporate, for example, a highly polar perfume.
• ester oils that can be used as polar oils in the present invention include tripropylene glycol dineopentanoate, isononyl isononanoate, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, and laurin.
• UV absorbers that can be used as polar oils in the present invention include benzoic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, dibenzoylmethane derivatives, ⁇ , ⁇ -diphenylacrylate derivatives, benzophenone derivatives, and benzylidene camphor. derivatives, phenylbenzimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, anthranyl derivatives, imidazoline derivatives, benzalmalonate derivatives, 4,4-diarylbutadiene derivatives and the like, but are not limited thereto. In addition, some specific examples and trade names of these will be exemplified below.
• benzoic acid derivatives include ethyl para-aminobenzoate (PABA), ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA (eg "Escarol 507"; manufactured by ISP), glyceryl PABA, PEG-25-PABA (eg "Uvinal P25”; manufactured by BASF), and hexyl diethylaminohydroxybenzoylbenzoate (eg, "Uvinal A Plus”), etc., but not limited thereto.
• PABA ethyl para-aminobenzoate
• Escarol 507 ethyl-dihydroxypropyl PABA
• ethylhexyl-dimethyl PABA eg "Escarol 507”
• glyceryl PABA eg "Uvinal P25”; manufactured by BASF
• hexyl diethylaminohydroxybenzoylbenzoate
• salicylic acid derivatives include homosalate (“Eusolex HMS”; manufactured by Rona/EM Industries), ethylhexyl salicylate (e.g. “NeoHeliopan OS”; manufactured by Harman & Reimer), Examples include, but are not limited to, propylene glycol salicylate (e.g., "Dipsal”; manufactured by Skell) and TEA salicylate (e.g., "Neo Heliopan TS”; manufactured by Harman & Reimer).
• cinnamic acid derivatives include ethylhexyl methoxycinnamate (octyl methoxycinnamate; for example, "Uvinal MC80"; manufactured by BASF Japan Ltd.), isopropyl methoxycinnamate, and isoamyl methoxycinnamate (for example, "Neo Heliopan E1000”; Harman & Reimer), cinnoxate, DEA methoxycinnamate, diisopropyl methylcinnamate, glyceryl-ethylhexanoate-dimethoxycinnamate, and di-(2-ethylhexyl)-4'-methoxybenzalmalonate, etc. include, but are not limited to.
• Dibenzoylmethane derivatives include, but are not limited to, 4-tert-butyl-4'-methoxydibenzoylmethane (eg, "Parsol 1789").
• ⁇ , ⁇ -diphenyl acrylate derivative examples include, but are not limited to, octocrylene (eg, "Ubinal N539"; manufactured by BASF).
• Benzophenone derivatives include benzophenone-1 (eg "Uvinal 400"; manufactured by BASF), benzophenone-2 (eg “Ubinal D50”; manufactured by BASF), benzophenone-3 or oxybenzone (eg "Ubinal M40"; manufactured by BASF).
• benzophenone-4 eg “Ubinal MS40”; manufactured by BASF
• benzophenone-5 benzophenone-6 (eg “Helisorb 11”; Norquai)
• benzophenone-8 eg “Spectra-sorb (Spectra- Sorb) UV-24”; manufactured by American Cyanamid
• benzophenone-9 eg, "Uvinal DS-49"; manufactured by BASF
• benzophenone-12 etc., but are not limited thereto.
• benzylidene camphor derivatives include 3-benzylidene camphor (eg, "Mexoryl SD”; manufactured by Simex), 4-methylbenzylidene camphor, benzylidene camphor sulfonic acid (eg, "Megizolyl SL”; manufactured by Simex), methosulfate camphor.
• benzalkonium e.g., "Megizolyl SO”; manufactured by Simex
• terephthalylidene dicamphor sulfonic acid e.g, "Megizolyl SX”; manufactured by Simex
• polyacrylamidemethylbenzylidene camphor e.g, "Megizolyl SW”; manufactured by Simex
• Phenylbenzimidazole derivatives include phenylbenzimidazole sulfonic acid (e.g. "Usolex 232"; manufactured by Merck) and disodium phenyldibenzimidazole tetrasulfonate (e.g. "Neo Heliopan AP”; manufactured by Harman & Reimer). ) and the like, but are not limited to these.
• triazine derivatives include bisethylhexyloxyphenol methoxyphenyltriazine, ethylhexyltriazone (e.g. "Uvinal T150”; manufactured by BASF), and diethihexylbutamide triazone (e.g. "Uvasorb HEB”; manufactured by Sigma 3V). , and 2,4,6-tris(diisobutyl-4′-aminobenzalmalonate)-s-triazine, and the like.
• Phenylbenzotriazole derivatives include drometrizole trisiloxane (e.g. "Silatrizole”; manufactured by Rhodia Shimmy) and methylenebis(benzotriazolyltetramethylbutylphenol) (e.g. "Tinosorb M” (Ciba Specialty). (Tea Chemicals Co., Ltd.)), etc., but are not limited to these.
• anthranil derivatives include, but are not limited to, menthyl anthranilate (eg, "Neo Heliopan MA”; manufactured by Harman & Reimer).
• imidazoline derivatives include, but are not limited to, ethylhexyldimethoxybenzylidene dioxoimidazoline propionate.
• Benzalmalonate derivatives include, but are not limited to, polyorganosiloxanes having benzalmalonate functional groups (for example, polysilicone-15; "Parsol SLX”; manufactured by DSM Nutrition Japan).
• 4,4-diarylbutadiene derivatives include, but are not limited to, 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene and the like.
• the polar oil for example, a polar oil having an IOB value of 0.17 to 0.63 is preferably used.
• the IOB value is an abbreviation for Inorganic/Organic Balance (inorganic/organic ratio), which is a value representing the ratio of the inorganic value to the organic value, and is an index indicating the degree of polarity of an organic compound. It becomes.
• composition of the present invention may further contain oil other than the polar oil described above as an oil, as long as the effects of the present invention are not impaired.
• oil components are not particularly limited, and include, for example, hydrocarbon oils, silicone oils, and the like.
• oils include linear silicone oils such as polydimethylsiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane, and octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, and the like.
• Hydrocarbon oils such as cyclic silicone oil, decane, dodecane, isododecane, isohexadecane, liquid paraffin, squalane, squalene, paraffin, etc., may be mentioned, but not limited to these.
• the other oil may be volatile oil or non-volatile oil.
• the content of the oil is, for example, 45% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, or 15% by mass or less. you can
• composition of the present invention may further contain other components within a range that does not impair the effects of the present invention.
• Other components are exemplified below.
• compositions of the invention may further comprise emulsifiers.
• hydrophobically modified alkyl cellulose is preferably used as an emulsifier.
• Hydrophobically modified alkyl cellulose is usually classified as a "polymer surfactant”.
• hydrophobically modified alkyl cellulose refers to alkyl cellulose that has been hydrophobically modified with an alkyl group having 14 to 22 carbon atoms.
• This hydrophobically modified alkylcellulose is a compound obtained by introducing a long-chain alkyl group, which is a hydrophobic group, into a water-soluble cellulose ether derivative, and is represented by the following general formula (I).
• R may be the same or different, and is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a group -[CH 2 CH(CH 3 )O] m -H (wherein m is an integer of 1 to 5, preferably 1 to 3), the group —CH 2 CH 2 OH, and the group —CH 2 CH(OH)CH 2 OR′, where R′ is a number of carbon atoms 14 to 22 alkyl groups), but necessarily including the group —CH 2 CH(OH)CH 2 OR′.
• A is a group —(CH 2 ) q — (q is an integer of 1 to 3, preferably 1), and n is an integer of 100 to 10,000, preferably 500 to 5,000. is. ]
• the method for producing the hydrophobically-modified alkyl cellulose of formula (I) generally comprises a basic water-soluble cellulose ether derivative, specifically methyl cellulose (where R is a hydrogen atom or a methyl group), ethyl cellulose (where R is a hydrogen atom or ethyl group), propyl cellulose (R is a hydrogen atom or a propyl group), butyl cellulose (R is a hydrogen atom or a butyl group), hydroxypropyl cellulose [R is a hydrogen atom or a hydroxypropyl group (the group -[CH 2 CH (CH 3 ) O] m —H (wherein m is an integer of 1 to 5, preferably 1 to 3))], hydroxypropylmethylcellulose (R is a hydrogen atom, a methyl group, or a hydroxypropyl group (same as above)) etc., can be obtained by contacting a compound for introducing a long-chain alkyl group having 14 to
• R′ is an alkyl group having 14 to 22 carbon atoms.
• the content of the group —CH 2 CH(OH)CH 2 OR′ introduced into the hydrophobically-modified alkylcellulose of the present invention is preferably about 0.1 to 5.0% by mass relative to the entire hydrophobically-modified alkylcellulose. .
• the molar ratio, reaction time, type of alkali catalyst, etc. in the reaction between the water-soluble cellulose ester derivative and the long-chain alkyl glycidyl ether may be appropriately selected.
• purification steps such as neutralization, filtration, washing, drying, and sieving of the reaction product may be performed.
• hydroxypropylmethylcellulose (wherein R in formula (I) is a hydrogen atom, a methyl group, or a group -[CH 2 CH ( CH 3 )O] m H and the group —CH 2 CH(OH)CH 2 OR′, q of the group A becomes 1, and the A becomes a methylene group).
• R' in the long-chain alkyl glycidyl ether of formula (II) is an alkyl group having 14 to 22 carbon atoms, preferably an alkyl group having 14 to 20 carbon atoms, more preferably a stearyl group having 18 carbon atoms (-C 18 H37 ). If the number of carbon atoms in the alkyl group R' is less than 14 or 23 or more, the emulsion stability of the obtained hydrophobically modified alkyl cellulose is not sufficient.
• the weight average molecular weight of the hydrophobically modified alkyl cellulose is preferably 100,000 to 1000,000, more preferably 300,000 to 800,000, still more preferably 550,000 to 750,000.
• hydrophobically modified alkylcellulose it is preferable to use hydrophobically modified hydroxypropylmethylcellulose (hydrophobicized hydroxypropylmethylcellulose), more specifically, stearoxyhydroxypropylcellulose.
• hydrophobically modified hydroxypropylmethylcellulose hydrophobicized hydroxypropylmethylcellulose
• stearoxyhydroxypropylcellulose hydrophobically modified hydroxypropylmethylcellulose
• a commercially available product can also be used as the hydrophobically modified alkyl cellulose.
• composition of the present invention contains an emulsifier
• its content is not particularly limited, and is, for example, 0.05% by mass or more, 0.10% by mass or more, 0.15% by mass or more, or 0.20% by mass. or more, and may be 1.0% by mass or less, 0.50% by mass or less, or 0.30% by mass or less.
• compositions of the invention may further comprise an aqueous phase thickener.
• Blending an aqueous phase thickener in the aqueous phase, and particularly using it in combination with the emulsifier described above, is preferable from the viewpoint of improving the blending ratio of the UV scattering agent and the UV absorber while suppressing the blending amount of the oil.
• the water-phase thickening agent is a thickening agent having a function of thickening the water phase, and in particular, the presence of electrolytes in a concentration range generally blended in cosmetics causes a decrease in viscosity.
• an aqueous phase thickener that causes a decrease in viscosity due to an increase in electrolyte concentration is also referred to as an "aqueous phase thickener with low salt resistance".
• Such a thickener with low salt tolerance may be selected from water-soluble thickeners conventionally blended for the purpose of adjusting the viscosity of the aqueous phase in cosmetics and the like.
• aqueous phase thickeners include polyvinyl alcohol, polyvinyl acetate, polyvinyl methyl ether, polyvinylpyrrolidone, copolymers of vinylpyrrolidone and vinyl acetate, vinyl polymers such as carboxyvinyl polymer; sodium polyacrylate, polyethyl Acrylates, alkanolamine polyacrylates, copolymers of alkyl methacrylates and dimethylaminoethyl methacrylates, poly 2-acrylamido-2-methylpropanesulfonic acid, polymethacryloyloxytrimethylammonium, (acryloyldimethyltaurate ammonium/VP) copolymers, dimethylacrylamide/ Examples include, but are not limited to, acrylic polymers such as acryloyldimethyltaurate Na) crosspolymer.
• thickeners with low salt tolerance compared to thickeners that thicken by entanglement of polymer chains, they form water-swellable microgels in the aqueous phase, and the swollen microgel particles
• a type of thickening agent that thickens due to friction because it can further suppress sliminess when the cosmetic is applied to the skin.
• the hydrophobically modified alkyl cellulose blended as the emulsifier described above also has a thickening effect due to the entanglement of polymer chains, so if a thickener that thickens by the same mechanism is further blended, the thickening effect is promoted and can cause sliminess.
• composition of the present invention contains an aqueous phase thickener
• its content is not particularly limited. .20% by mass or more, 0.25% by mass or more, or 0.30% by mass or more, and 3.0% by mass or less, 2.0% by mass or less, or 1.0% by mass or less good.
• composition of the present invention may contain, for example, propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, and the like.
• Glycols such as glycerin, diglycerin and polyglycerin; Sugar alcohols such as sorbitol, mannitol, maltitol, xylitol and erythritol; Sugars such as fructose, glucose, galactose, maltose, lactose and trehalose; Natural pigments such as carotene; plant-based polymers such as gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, gellan gum, and carrageenan; microbial-based polymers such as xanthan gum, dextran, succinoglucan, and pullulan; collagen, casein, albumin , animal polymers such as gelatin; starch-based polymers such as carboxymethyl starch and methylhydroxypropyl starch; methylcellulose, ethylcellulose, methylhydroxypropylcellulose, hydroxyethylcellulose, sodium cellulose
• composition of the present invention can be prepared according to a method commonly used for oil-in-water emulsified cosmetics. That is, it can be prepared by separately mixing the water phase component and the oil phase component, adding the oil phase component while stirring the water phase component, and emulsifying the water phase component.
• the composition of the present invention can be suitably used as a cosmetic or its raw material.
• the present invention particularly provides a cosmetic composition, more particularly a sunscreen cosmetic composition.
• compositions of Examples and Comparative Examples were prepared according to the formulations shown in Tables 1 and 2 below. The obtained compositions were evaluated as follows.
• the oil content of each composition shown in Table 1 is 18% by mass.
• the oil content of each composition shown in Table 2 is 28% by mass.
• the fact that the absorbance in the visible light region of the composition to be evaluated is less than the absorbance in the visible light region of the reference composition indicates that the whiteness derived from the UV scattering agent after application to the skin. In Tables 1 and 2, this is indicated as "A”. In addition, if the absorbance in the visible light region of the composition to be evaluated is greater than the absorbance in the visible light region of the reference composition, the whiteness derived from the UV scattering agent will be noticeable after application to the skin. In Tables 1 and 2 this is labeled "B", suggesting that the problem has not improved.
• the absorbance in the ultraviolet light region of the composition to be evaluated is greater than the absorbance in the ultraviolet light region of the reference composition, suggesting that the UV protection effect is improved.
• this is designated as "A”.
• the fact that the absorbance in the ultraviolet light region of the composition to be evaluated is smaller than the absorbance in the ultraviolet light region of the reference composition suggests that the UV protection effect is reduced, Tables 1 and 2 , this is referred to as "B”.
• compositions of Examples 1 and 2 have both a fresh feeling of use and a high UV protection effect, and after application to the skin, the whiteness derived from the UV scattering agent is conspicuous. It turns out that the problem of being stuck has been improved.

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• 2022
  • 2022-07-12 WO PCT/JP2022/027451 patent/WO2023286780A1/ja not_active Ceased
  • 2022-07-12 CN CN202280042562.5A patent/CN117479918A/zh active Pending
  • 2022-07-12 JP JP2023534822A patent/JPWO2023286780A1/ja active Pending

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