WO2017188319A1 - Oil-in-water-type emulsion cosmetic - Google Patents

Abstract

The purpose of the present invention is to provide an oil-in-water-type emulsion cosmetic which contains powder in the internal oil phase thereof, wherein the oil-in-water-type emulsion cosmetic has improved resistance to water and unprecedented breakthrough characteristics such that the protective effects against ultraviolet radiation increase more after the cosmetic comes into contact with water, sweat, etc than immediately after application, as well as an excellent sensation upon application and excellent washability. The present invention pertains to an oil-in-water-type emulsion cosmetic which contains (A) an ultraviolet absorbing agent, (B) an oil phase thickener, (C) a hydrophobization treatment powder, (D) a non-ionic surfactant and/or core-corona type microgel, and (E) a non-volatile oil content (including the (A) ultraviolet absorbing agent), and which is characterized in that the ratio of the combined amount of (B) oil phase thickener and (C) hydrophobization treatment powder to the amount of (E) non-volatile oil content ([(B) + (C)]/(E)) is 0.2 to 20.

Description

Oil-in-water emulsified cosmetic

The present invention relates to an oil-in-water emulsified cosmetic. More specifically, it is an oil-in-water emulsified cosmetic containing a powder in the inner aqueous phase, which is superior in water resistance and improves the UV protection effect etc. immediately after application by contact with water or sweat. The present invention relates to an oil-in-water emulsified cosmetic having no characteristics.

Protecting the skin from the damage of ultraviolet rays is one of the important issues in skin care and body care, and various UV care cosmetics have been developed to minimize the adverse effects of ultraviolet rays on the skin. Sunscreen cosmetics (sunscreen cosmetics), a type of UV care cosmetics, contain UV absorbers and UV scattering agents to block UVA and UVB from reaching the skin and protect the skin from UV damage. Protect (Non-Patent Document 1). Recently, it is considered that it is important to protect the skin from ultraviolet rays in daily life as well as the harsh UV conditions in outdoor activities such as summer swimming and swimming in the sea and winter skiing. Cosmetics having an ultraviolet protection effect are desired.

As the dosage form of sunscreen cosmetics, many preparations in an emulsified form are used, and the instability of emulsification sometimes leads to a decrease in UV protection ability. In Patent Document 1, it is described that storage stability is improved by blending free fatty acids having 14 to 24 carbon atoms, and a decrease in UV protection ability due to long-term storage is suppressed. However, even if UV protection is maintained until just before use, if sunscreen cosmetics applied to the skin come into contact with water or sweat, UV absorbers or UV scattering agents will flow out from the applied cosmetics, and UV rays It was thought that it was inevitable that the protective effect would decline.

Oil-in-water emulsions are widely used as sunscreen cosmetics because they provide a fresh feeling to use. However, oil-in-water emulsified cosmetics are often inferior in water resistance as compared to water-in-oil type, and the UV protection ability is likely to decrease due to the outflow of UV absorbers and UV scattering agents. In addition, oil-in-water emulsified cosmetics containing a powder such as an ultraviolet scattering agent in the inner oil phase are known to be particularly inferior in water resistance, and increasing the amount of powder to obtain a high UV protection ability, There is also a problem that it is necessary to add a large amount of the oil as the dispersion medium, and as a result, a sticky feeling is given.

In oil-in-water emulsified cosmetics, attempts have been made to improve water resistance by blending a film agent (Patent Document 2). However, since cosmetics applied to the skin are exposed to various moisture from inside and outside the coating, such as moisture from the outside environment such as sweat and seawater secreted from the skin, resins and coatings for imparting water resistance It was difficult to completely prevent the ultraviolet absorber and the ultraviolet scattering agent from flowing out even when the agent was blended in a high amount. Moreover, even if it was a case where the outflow of a ultraviolet absorber etc. could be prevented completely, it was thought that the ultraviolet protection effect obtained does not exceed immediately after application | coating.

Japanese Patent Laying-Open No. 2015-30723 JP 2004-91377 A

In the process of developing oil-in-water emulsified sunscreen cosmetics with a strong UV protection effect, the present invention does not reduce the UV protection effect due to contact with water, sweat, etc. Based on finding the phenomenon for the first time. The oil-in-water emulsified cosmetic targeted by the present invention has an unprecedented novel and innovative characteristic that the UV protection effect and the like are improved by contact with moisture.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have formulated an oil-phase thickener in an oil-in-water emulsified cosmetic in which a powder is blended in the inner oil phase, and further increases the oil phase. By adjusting the ratio of the total amount of the viscous agent and the hydrophobized powder to the amount of the non-volatile oil within a specific range, the water resistance and stability are improved, and the above new and innovative properties Has been found to achieve the present invention.

That is, the present invention
(A) UV absorber,
(B) oil phase thickener,
(C) Hydrophobized powder,
(D) a nonionic surfactant and / or a core-corona type microgel, and (E) a non-volatile liquid oil (including the (A) ultraviolet absorber),
(E) The ratio ([(B) + (C)] / (E)) of the total blending amount of (B) oil phase thickener and (C) hydrophobized powder to the blending amount of the non-volatile liquid oil. The present invention provides an oil-in-water emulsified cosmetic characterized by being 0.2 to 20.

In the present invention, the ultraviolet protection effect after contact with water, sweat, or the like is remarkably improved as compared with that immediately after the cosmetic is applied to the skin. In other words, the oil-in-water emulsified cosmetic according to the present invention has the conventional common sense that the UV protection effect and the like is improved by contact with moisture and the like, which has been the cause of the effect deterioration in the conventional oil-in-water emulsified cosmetic. Is an innovative sunscreen cosmetic with the opposite properties. In addition, since the cosmetic coating film is made uniform by contact with water, the optical properties of the skin to which the cosmetic is applied become close to the bare skin, and the aesthetic effect that the sense of transparency is increased and the skin feels beautiful is also exhibited.

Furthermore, the oil-in-water emulsified cosmetic composition of the present invention is excellent in stability, and the water resistance of the cosmetic coating film is improved without adding a coating agent or the like. Therefore, there is no film feeling, the elongation at the time of use (when applied) is good, and it can be easily removed with a general-purpose cleaning agent or soap. That is, the present invention can provide an oil-in-water emulsified cosmetic that is excellent in usability and detergency in addition to the unique UV protection effect and aesthetic effect.

As described above, the oil-in-water emulsified cosmetic of the present invention comprises (A) an ultraviolet absorber, (B) an oil phase thickener, (C) a hydrophobized powder, (D) a nonionic surfactant, and / or Alternatively, it contains a core-corona type microgel and (E) a non-volatile liquid oil. The oil-in-water emulsified sunscreen cosmetic that is one embodiment of the present invention will be described in detail below as an example.

(A) Ultraviolet Absorber (A) Ultraviolet absorber (hereinafter sometimes simply referred to as “component A”) blended in the oil-in-water emulsion cosmetic according to the present invention is conventionally used in sunscreen cosmetics. It can be set as at least 1 type selected from the ultraviolet absorber mix | blended.

The ultraviolet absorber (component A) used in the present invention is not particularly limited, but specific examples thereof include 2-ethylhexyl paramethoxycinnamate, 2,4-bis-{[4- (2- Ethylhexyloxy) -2-hydroxy] -phenyl} -6- (4-methoxyphenyl) 1,3,5-triazine, octocrylene, dimethicodiethylbenzalmalonate, polysilicon-15, t-butylmethoxydibenzoylmethane , Ethylhexyltriazone, diethylaminohydroxybenzoyl hexyl benzoate, bisethylhexyloxyphenol methoxyphenyltriazine, oxybenzone-3, methylenebisbenzotriazolyltetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate, ethyl salicylate It may include organic ultraviolet absorbers sill like.

The blending amount of the ultraviolet absorber (component A) in the oil-in-water emulsion cosmetic of the present invention is 1% by mass or more, more preferably 1 to 40% by mass with respect to the total amount of the cosmetic in the case of sunscreen cosmetics. More preferably, it is 2 to 30% by mass. On the other hand, the ultraviolet absorbent (component A) in the present invention also constitutes a part (or all) of the non-volatile liquid oil (component E). For example, if a sufficient amount of UV protection can be secured with a UV scattering agent that is stably maintained in the inner oil phase by adding a non-volatile liquid oil other than the UV absorber, It is also possible to make it less than 6 mass%, for example, 5 mass% or less, 3 mass% or less, or 2 mass% or less.

(B) Oil phase thickener (B) An oil phase thickener (hereinafter sometimes simply referred to as “component B”) is a substance that can adjust the viscosity of the oil phase. Esters, sucrose fatty acid esters, solid or semi-solid hydrocarbon oils, organically modified clay minerals, fatty acids or salts thereof are preferred, and two or more selected from these are particularly preferred.

The dextrin fatty acid ester is an ester of dextrin or reduced dextrin and a higher fatty acid, and can be used without particular limitation as long as it is generally used in cosmetics. It is preferable to use dextrin or reduced dextrin having an average sugar polymerization degree of 3 to 100. As the constituent fatty acid of the dextrin fatty acid ester, it is preferable to use a saturated fatty acid having 8 to 22 carbon atoms. Specific examples include dextrin palmitate, dextrin oleate, dextrin stearate, dextrin myristate, dextrin (palmitic acid / 2-ethylhexanoic acid), and the like.

As the sucrose fatty acid ester, a linear or branched fatty acid saturated or unsaturated fatty acid having 12 to 22 carbon atoms can be preferably used. Specifically, sucrose caprylate, sucrose caprate, sucrose laurate, sucrose myristic ester, sucrose palmitate, sucrose stearate, sucrose oleate, sucrose elca An acid ester etc. can be mentioned.

The solid or semi-solid hydrocarbon oil is a solid or semi-solid hydrocarbon at normal temperature (25 ° C.). Specific examples include petrolatum, hydrogenated palm oil, hydrogenated castor oil (castor wax), and palm kernel-cured oil. , Hydrogenated peanut oil, hydrogenated peanut (peanut) oil, hydrogenated rapeseed seed oil, hydrogenated camellia oil, hydrogenated soybean oil, hydrogenated olive oil, hydrogenated macadamia nut oil, hydrogenated sunflower oil, hydrogenated wheat germ oil, Examples thereof include hydrogenated rice germ oil, hydrogenated rice nutka oil, hydrogenated cottonseed oil, hydrogenated avocado oil, and waxes.

The organically modified clay mineral is a kind of colloidal hydrous aluminum silicate having a three-layer structure, and is representative of a clay mineral represented by the following general formula (1) modified with a quaternary ammonium salt type cationic surfactant. Is.
(X, Y) _2-3 (Si, Al) ₄ O ₁₀ (OH) ₂ Z _1/3 · nH ₂ O (1)
(However, X = Al, Fe (III), Mn (III), Cr (III), Y = Mg, Fe (II), Ni, Zn, Li, Z = K, Na, Ca)

Specific examples include dimethyl distearyl ammonium hectorite (disteardimonium hectorite), dimethyl alkyl ammonium hectorite, benzyl dimethyl stearyl ammonium hectorite, distearyl dimethyl ammonium chloride-treated aluminum magnesium silicate, and the like. Benton 27 (benzyldimethylstearylammonium chloride-treated hectorite: manufactured by Elementis Japan) and Benton 38 (distearyldimethylammonium chloride-treated hectorite: manufactured by Elementis Japan) are preferable as commercial products.

The fatty acid can be used at room temperature, and examples thereof include myristic acid, palmitic acid, stearic acid, and behenic acid. Examples of fatty acid salts include calcium salts, magnesium salts and aluminum salts of these fatty acids.

(C) Hydrophobized powder The powder in the present invention (hereinafter, also simply referred to as “component C”) is a powder blended as an ultraviolet scattering agent, a usable powder, and a coloring material in conventional sunscreen cosmetics and the like. The ultraviolet light scattering agent is not particularly limited, but is preferably a fine metal oxide such as zinc oxide, titanium oxide, iron oxide, cerium oxide, Examples thereof include powders of tungsten oxide, etc. Examples of usable powders and coloring materials include talc and titanium mica.

As the surface hydrophobizing agent, those generally used in the cosmetics field, for example, dimethicone, silicone such as alkyl-modified silicone, alkoxysilane such as octyltriethoxysilane, dextrin fatty acid ester such as dextrin palmitate, stearic acid, etc. Fatty acid, silica and the like can be used. Among these, an ultraviolet scatterer whose surface has been hydrophobized with alkoxysilane such as octyltriethoxysilane or silica is particularly preferable.

(D) Nonionic surfactant and / or core-corona type microgel (D1) Nonionic surfactant The nonionic surfactant in the present invention (hereinafter sometimes referred to as “component D1”) is: One or more kinds selected from nonionic surfactants conventionally used in oil-in-water emulsified cosmetics may be used, and among them, those having an HLB of 6 or more are preferably used.

The nonionic surfactant used in the present invention particularly preferably contains polyoxyethylene hydrogenated castor oil in terms of the stability of the preparation and the effect of improving the absorbance by contact with moisture. Specific examples of polyoxyethylene hydrogenated castor oil include PEG-10 hydrogenated castor oil, PEG-20 hydrogenated castor oil, PEG-25 hydrogenated castor oil, PEG-30 hydrogenated castor oil, and PEG-40 hydrogenated castor oil. Oil, PEG-50 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-80 hydrogenated castor oil, PEG-100 hydrogenated castor oil, and the like. On the other hand, when polyoxyethylene hydrogenated castor oil is not included, it is preferable to use a nonionic surfactant having an HLB of 8 or more, preferably 10 or more, more preferably 12 or more.

In the present invention, the blending amount of the (D1) nonionic surfactant is 0.1 to 10% by mass, preferably 0.5 to 5% by mass, more preferably 0.8 to 3%, based on the total amount of the cosmetic. % By mass. If the amount of component D1 is less than 0.1% by mass, sufficient stability is difficult to obtain, and if it exceeds 10% by mass, it may not be preferable in terms of usability.
Moreover, it is preferable to mix | blend 50 mass% or more of component D1 so that polyoxyethylene hydrogenated castor oil may occupy, and the aspect in which component D1 consists of polyoxyethylene hydrogenated castor oil is preferable.

(D2) Core-corona-type microgel The core-corona-type microgel in the present invention (hereinafter sometimes referred to as “component D2”) is a gel in which a hydrophilic group (corona) is partially provided on the surface of a hydrophobic core. Fine particles. As the core-corona type microgel in the present invention, both a crosslinked type and a non-crosslinked type can be used.
As particularly preferred core-corona type microgels, as shown below, (acrylates / methoxy methacrylate PGE) crosspolymer [crosslinked core-corona type microgel] and acrylamide-based core-corona type microgel [non-crosslinked type core-corona type] Microgel] is exemplified.

1. Cross-linked core-corona-type microgel [(Acrylates / Methoxy methacrylate PGE-90) crosspolymer]]
The cross-linked core-corona microgel according to this embodiment can be obtained by radical polymerization of monomers represented by the following formulas (1) to (3) under specific conditions.

R ₁ is an alkyl group having 1 to 3 carbon atoms, and n is a number of 8 to 200. X is H or CH ₃ .

As the polyethylene oxide macromonomer represented by the formula (1), for example, a commercially available product commercially available from Aldrich, or a commercially available product such as BLEMMER (registered trademark) available from NOF Corporation may be used.
The molecular weight (that is, the value of n) of the polyethylene oxide portion needs to be n = 8 to 200.
Examples of such a macromonomer include Blemmer (registered trademark) PME-400, Blemmer (registered trademark) PME-1000, and Blemmer (registered trademark) PME-4000 manufactured by NOF Corporation.

R ₂ is an alkyl group having 1 to 3 carbon atoms.
R ₃ is an alkyl group having 1 to 12 carbon atoms, and more preferably an alkyl group having 1 to 8 carbon atoms.

As the hydrophobic monomer represented by the formula (2), for example, a commercially available product commercially available from Aldrich or Tokyo Kasei can be used.

Specific examples of the hydrophobic monomer of the formula (2) include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, pentyl acrylate, hexyl acrylate, heptyl acrylate, octyl acrylate, Decyl acrylate, dodecyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, pentyl methacrylate, hexyl methacrylate, heptyl methacrylate, octyl methacrylate, decyl methacrylate, dodecyl methacrylate, etc. Can be mentioned. In particular, it is preferable to use methyl methacrylate, butyl methacrylate, or octyl methacrylate.
These hydrophobic monomers are general-purpose raw materials and can be easily obtained as general industrial raw materials.

R ₄ and R ₅ each independently represents an alkyl group having 1 to 3 carbon atoms, and m is a number from 0 to 2.

The crosslinkable monomer represented by the formula (3) can be obtained as a commercial product or an industrial raw material. This crosslinkable monomer is preferably hydrophobic.
The value of m is preferably 0-2. Specifically, it is preferable to use ethylene glycol dimethacrylate (hereinafter sometimes abbreviated as EGDMA) marketed by Aldrich, Blemmer (registered trademark) PDE-50 marketed by NOF Corporation, or the like.

The crosslinked core-corona type microgel according to this embodiment is obtained by radical polymerization of the above monomer under the following conditions (a1) to (e1).
(A1) The molar ratio represented by the charged molar amount of the polyethylene oxide macromonomer / the charged molar amount of the hydrophobic monomer is 1:10 to 1: 250.
(B1) The charge amount of the crosslinkable monomer is 0.1 to 1.5% by mass with respect to the charge amount of the hydrophobic monomer.
(C1) The hydrophobic monomer represented by the formula (2) has a monomer composition in which one or more methacrylic acid derivatives having an alkyl group having 1 to 8 carbon atoms are mixed.
(D1) When the polymerization solvent is a water-organic solvent mixed solvent and a polyol is used as the organic solvent, one or more selected from dipropylene glycol, 1,3-butylene glycol, and isoprene glycol are used. There is.
(E1) The solvent composition of the mixed solvent of water and organic solvent is water: organic solvent = 90 to 10:10 to 90 at a mass ratio or volume ratio of 20 ° C.

In the present invention, “the charged amount of the crosslinkable monomer with respect to the charged amount of the hydrophobic monomer” is defined as “crosslinking density (mass%)”. The crosslinking density of the core-corona type microgel used in the present invention is such that the amount of the crosslinkable monomer charged is 0.1 to 1.5% by mass with respect to the amount of the hydrophobic monomer charged according to the condition (b1). Must.

Below, each condition is explained in full detail.
・ Condition (a1)
Polymerization is possible in the molar amount of polyethylene oxide macromonomer and hydrophobic monomer in the range of polyethylene oxide macromonomer: hydrophobic monomer = 1: 10 to 1: 250 (molar ratio). The charged molar amount is preferably 1:10 to 1: 200, more preferably 1:25 to 1: 100.
When the molar amount of the hydrophobic monomer is less than 10 times the molar amount of the polyethylene oxide macromonomer, the polymer to be polymerized becomes water-soluble and no core-corona microgel is formed. Further, the dispersion stabilization by the polyethylene oxide macromonomer in which the molar amount of the hydrophobic monomer exceeds 250 times the molar amount of the polyethylene oxide macromonomer becomes incomplete, and the hydrophobic polymer by the insoluble hydrophobic monomer aggregates and precipitates.

・ Condition (b1)
By copolymerizing the crosslinkable monomer, it is possible to polymerize the microgel in which the hydrophobic polymer in the core portion is crosslinked.
When the charge amount of the crosslinkable monomer is less than 0.1% by mass of the charge amount of the hydrophobic monomer, the crosslink density is low, and the microgel collapses when swollen. On the other hand, when the charged amount exceeds 1.5% by mass, aggregation of microgel particles occurs, and suitable microgel particles having a narrow particle size distribution cannot be polymerized. The amount of the crosslinkable monomer charged is preferably 0.2 to 1.0, more preferably 0.2 to 0.8, and most preferably 0.2 to 0.5% by mass.

・ Condition (c1)
The hydrophobic monomer represented by the formula (2) needs to have a monomer composition in which one or more methacrylic acid derivatives having an alkyl group having 1 to 8 carbon atoms are mixed. If the number of carbon atoms is 0 (a monomer having no terminal ester bond), the monomer may be too hydrophilic to perform emulsion polymerization well. On the other hand, when the number of carbon atoms is 9 or more, there may be a steric hindrance during polymerization, and a crosslinked structure may not be successfully constructed.

・ Condition (d1)
The polymerization solvent needs to be a mixed solvent of water-organic solvent. As the organic solvent, ethanol, propanol, butanol, polyol and the like can be used. When polyol is used, the hydrophobic monomer represented by the formula (2) and the crosslinkable monomer represented by the formula (3). What can melt | dissolve is preferable. The polyol used in the present invention needs to be dipropylene glycol, 1,3-butylene glycol, or isoprene glycol.
It is possible to manufacture industrially, that is, when considering using the polymerization solution as a raw material as it is without requiring a purification step such as dialysis, the solvent mixed with water is ethanol, propanol, butanol, etc. when applied to the skin It is preferably an polyol that can be blended into cosmetics for general purposes, not an organic solvent in which irritation is a concern.

・ Condition (e1)
The solvent composition of the mixed solvent of water and organic solvent as the polymerization solvent needs to be water: organic solvent = 90 to 10:10 to 90 at a mass ratio of 20 ° C. The solvent composition of the water-organic solvent mixed solvent is preferably water: organic solvent = 90 to 10:10 to 90 (volume ratio at 20 ° C.), and water: organic solvent = 80 to 20:20 to 80 ( More preferably, the volume ratio is 20 ° C.
As the polymerization solvent, it is necessary to add an organic solvent in order to uniformly dissolve the hydrophobic monomer. The mixing ratio of the organic solvent is 10 to 90 volume ratio. When the mixing ratio of the organic solvent is lower than 10 volume ratio, the solubility of the hydrophobic monomer is extremely low, the polymerization proceeds in the form of monomer droplets to form a huge mass, and no microgel is formed. On the other hand, when the mixing ratio of the organic solvent exceeds 90 volume ratio, an emulsion of a hydrophobic monomer due to hydrophobic interaction is not generated, emulsion polymerization does not proceed, and a microgel cannot be obtained.

Core-corona type microgel obtained by using polyol as an organic solvent is a water-polyol mixed solvent as a polymerization solvent and does not contain ethanol. Obtainable.

As the polymerization initiator used in the polymerization system, a commercially available polymerization initiator used for usual water-soluble thermal radical polymerization can be used. In this polymerization system, even if the polymerization is carried out without strictly controlling the stirring conditions, it is possible to obtain a polymer having a very narrow particle size distribution.

2. Non-crosslinked core-corona microgel [acrylamide core-corona]
The non-crosslinked core-corona microgel suitably used in the present invention is a dispersion of core-corona microparticles obtained by radical polymerization of monomers represented by the following formulas (4) to (6) under specific conditions. It is a liquid.

R ₁ is an alkyl group having 1 to 3 carbon atoms, and n (molecular weight of the polyethylene oxide portion) is a number of 8 to 200. X is H or CH ₃ .

The polyethylene oxide macromonomer represented by the above formula (4) is preferably an acrylic acid derivative or a methacrylic acid derivative. For example, a commercial product commercially available from Aldrich or a commercial product such as Bremer (registered trademark) marketed by NOF Corporation may be used. Examples include PME-400, PME-1000, and PME-4000, which are methoxypolyethylene glycol monometalates (n values in formula (1) are n = 9, n = 23, and n = 90, respectively, all by NOF Corporation. May be used.

R ₂ represents an alkyl group having 1 to 3 carbon atoms, and R ₃ represents a substituent containing an alkyl group having 1 to 12 carbon atoms.

The hydrophobic monomer represented by the above formula (5) is preferably an acrylic acid derivative or a methacrylic acid derivative (also referred to as “acrylate derivative monomer”), for example, methyl acrylate, ethyl acrylate, acrylic acid monomer. Pill, butyl acrylate, pentyl acrylate, hexyl acrylate, heptyl acrylate, octyl acrylate, decyl acrylate, dodecyl acrylate, methyl methacrylate, ethyl methacrylate, pill methacrylate, butyl methacrylate, Pentyl methacrylate, hexyl methacrylate, heptyl methacrylate, octyl methacrylate, decyl methacrylate, dodecyl methacrylate, and the like can be used. Of these, methyl methacrylate (also known as methyl methacrylate), butyl methacrylate (also known as butyl methacrylate), and octyl methacrylate are particularly suitable.
These hydrophobic monomers are general-purpose raw materials and can be easily obtained as general industrial raw materials. For example, you may use the commercial item marketed from Aldrich or Tokyo Kasei.

R ₄ represents H or an alkyl group having 1 to 3 carbon atoms, and R ₅ and R ₆ represent H or a substituent containing an alkyl group having 1 to 18 carbon atoms, preferably 1 to 12 carbon atoms.

The hydrophobic monomer represented by the above formula (6) is preferably an acrylamide derivative or a methacrylamide derivative (also referred to as “acrylamide derivative monomer”). For example, t-butyl acrylamide, N, N-dimethylacrylamide, N- [3- (dimethylamino) propyl] acrylamide, t-butyl methacrylamide, octyl acrylamide, octyl methacrylamide, octadecyl acrylamide and the like can be suitably used. . Of these, t-butylacrylamide, N, N-dimethylacrylamide, and N- [3- (dimethylamino) propyl acrylamide] acrylamide are particularly preferable.
These hydrophobic monomers are available as commercial products or industrial raw materials.

The copolymer constituting the core-corona type microparticles according to the present invention comprises a macromonomer represented by the above formula (4) by any radical polymerization method according to the following conditions (a2) to (d2): One or two or more selected from the hydrophobic monomers represented by the above formulas (5) and (6) are copolymerized.
(A2) The molar ratio represented by the charged molar amount of the polyethylene oxide macromonomer / (the acrylate derivative monomer and / or acrylamide derivative monomer) is 1:10 to 1: 250.
(B2) The macromonomer represented by the above formula (4) is an acrylic acid derivative or a methacrylic acid derivative having a polyethylene glycol group having a repeating unit of 8 to 200,
The acrylate derivative monomer represented by the above formula (5) is an acrylic acid derivative or a methacrylic acid derivative having a substituent containing an alkyl group having 1 to 12 carbon atoms,
The acrylamide derivative monomer represented by the above formula (6) is an acrylamide derivative or a methacrylamide derivative having a substituent containing an alkyl group having 1 to 12 carbon atoms,
(C2) The polymerization solvent is a water-alcohol mixed solvent, and the alcohol is one or more selected from ethanol, dipropylene glycol, 1,3-butylene glycol, and isoprene glycol.
(D2) The solvent composition of the water-alcohol mixed solvent is water: alcohol = 90 to 10:10 to 90 at a mass ratio of 20 ° C.

Below, each condition is explained in full detail.
・ Condition (a2)
The charged molar amount of the polyethylene oxide macromonomer and the hydrophobic monomer (that is, the total of acrylate derivative monomer and / or acrylamide derivative monomer) is polyethylene oxide macromonomer: hydrophobic monomer = 1: 10 to 1: 250 (mol) Ratio). The charged molar amount is preferably 1:10 to 1: 200, more preferably 1:25 to 1: 100.
When the molar amount of the hydrophobic monomer is less than 10 times the molar amount of the polyethylene oxide macromonomer, the polymer to be polymerized becomes water-soluble and does not form core-corona type particles. In addition, when the molar amount of the hydrophobic monomer with respect to the molar amount of the polyethylene oxide macromonomer exceeds 250 times, the dispersion stabilization by the polyethylene oxide macromonomer becomes incomplete, and the hydrophobic polymer by the insoluble hydrophobic monomer aggregates and precipitates. To do.

・ Condition (b2)
The condition (b2) includes the following three conditions (b2-1) to (b2-3).
(B2-1)
The macromonomer represented by the formula (4) is an acrylic acid derivative or a methacrylic acid derivative having a polyethylene glycol group having 8 to 200 repeating units. When the repeating unit is 7 or less, particles stably dispersed in the solvent may not be obtained, and when it exceeds 200, the particles may be made fine and unstable when blended in a cosmetic.
(B2-2)
The acrylate derivative monomer represented by the formula (5) is an acrylic acid derivative or a methacrylic acid derivative having a substituent containing an alkyl group having 1 to 12 carbon atoms. If the number of carbon atoms is 0 (a monomer having no terminal ester bond), the monomer may be too hydrophilic to perform emulsion polymerization well. On the other hand, when the number of carbon atoms is 13 or more, a preferable feeling of use may not be obtained.
(B2-3)
The acrylamide derivative monomer represented by the formula (6) is an acrylamide derivative or a methacrylamide derivative having a substituent containing an alkyl group having 1 to 18 carbon atoms.

The hydrophobic monomer according to this embodiment has a monomer composition in which one or more selected from the acrylate derivative monomer represented by the above formula (5) and the acrylamide derivative monomer represented by the formula (6) are mixed. It is necessary.

In this embodiment, two types of hydrophobic monomers, methacrylate and butyl methacrylate, or methacrylate, t-butylacrylamide, N, N-dimethylacrylamide, and N- [3- (dimethylamino) propyl] acrylamide] are used. It is particularly preferable to use four types. In the combination of these hydrophobic monomers, it is further preferable to use methoxypolyethylene glycol monometalate as a macromonomer.
Although not limited by this, as the most preferred combination of macromonomer and hydrophobic monomer in this embodiment,
Methoxypolyethylene glycol monometalates, methacrylates and butyl methacrylates having a repeating unit of polyethylene glycol groups of 8 to 90, most preferably 15.
Methoxypolyethylene glycol monometalates, methacrylates, t-butylacrylamide, N, N-dimethylacrylamide, and N- [3- (dimethylamino) propylene having a polyethylene glycol group repeating unit of 8 to 200, most preferably 90 Mouth pill] acrylamide, t-butylmethacrylamide, octylacrylamide, octylmethacrylamide, and octadecylacrylamide.

・ Condition (c2)
The polymerization solvent needs to be a water-alcohol mixed solvent. As alcohol, what can melt | dissolve the hydrophobic monomer shown by Formula (5) and (6) is preferable. Accordingly, one or more selected from ethanol, dip-opened pyrene glycol, 1,3-butylene glycol, and isoprene glycol are preferred.

・ Condition (d2)
The solvent composition of the water-alcohol mixed solvent which is a polymerization solvent is preferably water: alcohol = 90 to 10:10 to 90, more preferably water: alcohol = 80 to 20 mass ratio or volume ratio at 20 ° C. 20: 20-80. When the mixing ratio of alcohol is lower than 10 volume ratio, the dissolving ability of the hydrophobic monomer becomes extremely low, and microparticles may not be generated. In addition, when the mixing ratio of the alcohol exceeds 90 volume ratio, an emulsion of a hydrophobic monomer due to hydrophobic interaction may not be generated, and emulsion polymerization may not proceed, resulting in failure to obtain Mikuguchi particles.

The core-corona type microgel preferably used in the present invention is a microgel stabilized with a polyethylene oxide chain which is a nonionic polymer, and its dispersion stability in water has acid resistance and salt resistance. I can expect. In the above microgel, the hydrophilic macromonomer and the hydrophobic monomer are ordered in the solvent, the particle diameter is almost constant, and the core part is crosslinked or non-crosslinked core-corona type polymer microgel. Is considered to generate.

The blending amount of the core-corona type microgel in the cosmetic of the present invention is usually preferably 0.01 to 10% by mass (pure) with respect to the total amount of the cosmetic. If the blending amount is less than 0.01% by mass (pure content), it may be difficult to obtain a stable cosmetic. When the blending amount exceeds 10% by mass (pure content), it may not be preferable from the viewpoint of stability in long-term storage under high temperature conditions, or the feeling of use may be inferior.

The above-mentioned core-corona type microgel has a structure in which an oil phase component and an aqueous phase component are emulsified and the core-corona type microgel emulsifier is adsorbed onto oil droplets of the oil phase component dispersed in the aqueous phase component. Having an oil-in-water emulsion composition. The core-corona type microgel emulsifier as described above is excellent in emulsifying power, and when used as an emulsifier, it becomes an oil-in-water type emulsified composition having extremely excellent stability. The core-corona type microgel can obtain sufficient strength against the behavior of the hydrophobic powder having a large specific gravity present in the oil phase.

(E) Non-volatile liquid oil content The oil-in-water emulsified cosmetic of the present invention contains (E) a non-volatile liquid oil content.
“Non-volatile liquid oil” in the present specification indicates no volatility at normal temperature (25 ° C.) and normal pressure (1 atm (9.8 × 10 ⁴ Pa)) (for example, the boiling point at normal pressure is (It includes oils of about 200 ° C or higher), fluid oil at normal temperature and pressure, and non-solid liquid oil. Nonvolatile oils other than silicone oil and silicone oil (hydrocarbon oil, ester oil, etc.) )including.

(E) The non-volatile liquid oil in the present invention includes an oily ultraviolet absorber corresponding to the component A. Therefore, the present invention includes (1) an embodiment in which the non-volatile liquid oil component (component E) contains a non-volatile liquid oil component other than the ultraviolet absorber, and (2) an embodiment in which component E consists of only the ultraviolet absorber. .

The non-volatile liquid oil other than the ultraviolet absorber contained in Component E includes, for example, hydrocarbon oil, vegetable oil, ester oil, high molecular weight polyoxyalkylene glycol, and silicone oil.

Specific examples include palm oil, linseed oil, camellia oil, macadamia nut oil, corn oil, olive oil, avocado oil, sasanqua oil, castor oil, safflower oil, kyounin oil, cinnamon oil, jojoba oil, grape oil, almond oil, Rapeseed oil, sesame oil, sunflower oil, wheat germ oil, rice germ oil, rice bran oil, cottonseed oil, soybean oil, peanut oil, tea seed oil, evening primrose oil, egg yolk oil, liver oil, triglycerin, glyceryl trioctanoate, triisopalmitin Liquid fats and oils such as glyceryl acid; octanoic acid esters such as cetyl octanoate, isooctanoic acid esters such as glyceryl tri-2-ethylhexanoate and pentaerythritol tetra-2-ethylhexanoate, and lauric acid esters such as hexyl laurate; Millimeters such as isopropyl myristate and octyldodecyl myristate Oleic acid esters such as paltic acid esters, palmitic acid esters such as octyl palmitate, stearic acid esters such as isocetyl stearate, isostearic acid esters such as isopropyl isostearate, isopalmitic acid esters such as octyl isopalmitate, and isodecyl oleate , Adipic acid diesters such as diisopropyl adipate, sebacic acid diesters such as diethyl sebacate, ester oils such as diisostearyl malate; hydrocarbon oils such as liquid paraffin and squalane; polyoxybutylene polyoxypropylene glycol, polydimethylsiloxane And the like.

Ratio of [total blending amount of component B and component C] / [blending amount of component E] The cosmetic of the present invention is an oil-in-water emulsified cosmetic, and contains powder in the inner oil phase. In such a powder-in-oil-in-water emulsion, if the viscosity of the inner oil phase is large, it tends to be difficult to obtain a stable emulsion. However, in the present invention, the total amount of (B) oil phase thickener and (C) hydrophobized powder constituting the inner oil phase and (E) non-volatile liquid oil (including (A) ultraviolet absorber) By setting the ratio ([B + C / E]) to the blending amount within a predetermined range, a stable emulsion can be obtained, and there is a unique effect of improving the ultraviolet protection ability by contact with moisture.

(B) Oil phase thickener and (C) Hydrophobized powder in the oil-in-water emulsified cosmetic composition of the present invention, and (E) Non-volatile liquid oil (including (A) UV absorber) It is essential that the ratio ([B + C / E]) to the blending amount is in the range of 0.2 to 20.

The total amount of (B) oil phase thickener and (C) hydrophobized powder is preferably 7.5 to 40% by mass based on the total amount of cosmetics. (E) Non-volatile liquid The blending amount of the oil can be appropriately adjusted within a range satisfying the condition of [B + C / E] = 0.2 to 20.

In the oil-in-water emulsified cosmetic of the present invention, in addition to the above essential components, components usually used in cosmetics can be blended as optional components as long as the effects of the present invention are not impaired.

Examples of optional components include volatile oils, and volatile oils that can be blended in the present invention include volatile hydrocarbon oils and volatile silicone oils, and lower alcohols such as ethanol.
The volatile hydrocarbon oil content is not particularly limited as long as it is a hydrocarbon oil having volatility at room temperature (25 ° C.) conventionally used in cosmetics and the like. Specific examples include isododecane, isohexadecane, hydrogenated polyisobutene and the like.

Volatile silicone oils include silicone oils that are volatile at room temperature (25 ° C.), such as volatile linear silicone oils (volatile dimethicone) and volatile cyclic rings that have been used in cosmetics and the like. Silicone oil (volatile cyclomethicone) is included. As volatile dimethicone, low-viscosity dimethylpolysiloxane such as decamethyltetrasiloxane can be used, and commercially available products include KF-96L-1.5cs and KF-96L-2cs (both manufactured by Shin-Etsu Chemical Co., Ltd.). ) And the like. Examples of volatile cyclomethicone include decamethylcyclopentasiloxane (D5).

Other optional components include water-soluble or oil-soluble coating agents. By blending the coating agent, it is possible to further enhance the resistance to (A) the ultraviolet absorber and (C) the spilling of the hydrophobic treatment powder and the rub-off caused by clothes. However, the blending amount is preferably within a range in which the film feeling (usability) and the cleaning property are not deteriorated.

The coating agent is not particularly limited as long as it is usually used in cosmetics. Specifically, polyvinylpyrrolidone (PVP), PVP / dimethylaminoethyl methacrylic acid copolymer, PVP / eicosene copolymer, PVP / PVP coatings such as / methacrylic acid / methacrylic acid copolymer, PVP / hexadecene copolymer, PVP / VA copolymer, PVP / vinyl acetate / itaconic acid copolymer, styrene / PVP copolymer; acrylic Ethyl acrylate / acrylic amide / acrylic acid copolymer, ethyl acrylate / butyl acrylate copolymer, ethyl acrylate / ethyl methacrylate copolymer, ethyl acrylate / methacrylic acid copolymer, ethyl acrylate / methacrylic acid Methyl acrylate copolymer, octyl acrylate / vinyl acetate copolymer, acrylic acrylate Chill / styrene copolymer, butyl acrylate / vinyl acetate copolymer, butyl acrylate / hydroxyethyl methacrylate copolymer, butyl acrylate / methyl methacrylate copolymer, methoxyethyl acrylate / hydroxyethyl acrylate / Acrylic acid coating agents such as butyl acrylate copolymer, lauryl acrylate / vinyl acetate copolymer, polyethyl acrylate, polybutyl acrylate, and polystyrene acrylate resin; vinyl acetate coating agents such as polyvinyl acetate; Methacrylic acid-based coating agents such as polymethyl methacrylate, methyl methacrylate / butyl acrylate / octyl acrylate, vinylpyrrolidone diethyl sulfate / N, N′-dimethylamino methacrylic acid copolymer; vinyl methyl ether / ethyl maleate Copolymer, vinyl methyl ether Vinyl methyl ether type skin coating agent such as styrene / butyl maleate copolymer; Styrenic type coating agent such as styrene / methyl styrene / indene copolymer; Alkyd resin type coating agent such as cyclohexane alkyd resin; Trimethylsiloxysilicate And the like, and the like.

As other optional ingredients, ingredients usually used in cosmetics, such as whitening agents, moisturizers, antioxidants, oily active agents, surfactants, aqueous phase thickeners, usable powders (hydrophobized ones) ), Coloring materials, aqueous activators and the like.

¡Usable powders and color materials, which are optional components, can be those usually blended in makeup cosmetics such as pigments and pearl pigments. Specifically, inorganic white pigments (titanium dioxide, zinc oxide), inorganic red pigments (iron oxide (bengara), iron titanate), inorganic brown pigments (γ-iron oxide), inorganic yellow pigments ( Yellow iron oxide, ocher), inorganic black pigment (black iron oxide, carbon, low-order titanium oxide), inorganic purple pigment (mango violet, cobalt violet), inorganic green pigment (chromium oxide, chromium hydroxide, titanic acid) Cobalt), inorganic blue pigments (ultraviolet, bitumen), pearl pigments (titanium oxide coated mica, titanium oxide coated bismuth oxychloride, titanium oxide coated talc, colored titanium oxide coated mica, bismuth oxychloride, fish scale foil), metal powder pigments (Aluminum powder, copper powder), organic pigment (red 202, red 205, red 220, red 228, red 405, orange 203, Orange 204, Yellow 205, Yellow 401, Blue 404), Zirconium, Barium, Aluminum Lake organic pigments (Red 3, Red 104, Red 227, Red 401, Orange 205, Yellow 4) , Yellow 202, green 3 and blue 1), natural pigments (chlorophyll, carcinoids (β-carotene), calsamine, cochineal, chalcone, curcumin, betanin, flavonol, flavone, anthocyanidin, anthraquinone, naphthoquinone), functionality Pigments (boron nitride, photochromic pigments, synthetic fluorine phlogopite, iron-containing synthetic fluorine phlogopite, fine particle composite powder (hybrid fine powder)) and the like are exemplified, but not limited thereto. Usable powders and color materials can be blended, for example, by combining one or more selected from the above.

The oil-in-water emulsified cosmetic of the present invention can be produced according to a conventional method. For example, an aqueous phase thickener is optionally dissolved in an aqueous component (including a nonionic surfactant and / or a core-corona type microgel), and a surface activity is partially applied to the oily component in which the oil phase thickener is dissolved. It can be prepared by adding an agent to dissolve or disperse the UV scattering agent, adding it to the aqueous component, emulsifying with a homomixer, etc., and finally adding the remaining oil component and powder and stirring and mixing ( When stirring, a shearing force may optionally be added).

The oil-in-water emulsified cosmetic composition of the present invention can be preferably used as, for example, a sunscreen cream, a sunscreen emulsion, a sunscreen lotion, a foundation imparted with a sunscreen effect, a makeup base and the like.

As mentioned above, although the aspect of sunscreen cosmetics was demonstrated, this invention is not limited to this aspect. For example, by adding a pearl agent, a colorant (pigment), etc. based on the cosmetic of the present invention, the characteristics (transparency, color developability, unevenness correction effect, etc.) change by contact with moisture. It is possible to make various types of makeup cosmetics or skin care cosmetics. The cosmetic in such an embodiment has a novel property that the makeup effect and the skin care effect are improved by contact with sweat or moisture. This characteristic is that (A) a sunscreen cosmetic containing 1% by mass or more of an ultraviolet absorber also contains (A) a cosmetic that contains less than 1% by mass of the ultraviolet absorber or a cosmetic that does not contain an ultraviolet absorber. (See Table 4 and formulation examples 5 and 6).

That is, the present invention
(A1) 1% by mass or less of an ultraviolet absorber,
(B) oil phase thickener,
(C) Hydrophobized powder,
(D) a nonionic surfactant and / or a core-corona type microgel, and (E) a non-volatile liquid oil (including the (A) ultraviolet absorber),
(E) The ratio ([(B) + (C)] / (E)) of the total blending amount of (B) oil phase thickener and (C) hydrophobized powder to the blending amount of the non-volatile liquid oil. An embodiment of an oil-in-water emulsified cosmetic that is 0.2 to 20 is also included.

In the invention of this aspect, the components (A) to (E) are the same as those described for the sunscreen cosmetic. However, the blending amount of the (A) ultraviolet absorber may be less than 1% by mass, for example, 0.5% by mass or less, 0.3% by mass or less, or 0.1% by mass or less, and does not include the ultraviolet absorber. Also good.

The oil-in-water emulsified cosmetic of the present invention is characterized in that the cosmetic coating film (film thickness) is uniformized by contact with moisture. Although not meant to limit the present invention, the present inventors are the result that the distribution (density) of the UV absorber in the direction perpendicular to the skin in the cosmetic coating film on the skin is made uniform over the entire coating film. , Believes that UV protection is improved. This phenomenon is not limited to ultraviolet absorbers, and is thought to contribute to the uniformity of the distribution of the various components incorporated. Therefore, when the film comes into contact with moisture due to sweating and the like becomes uniform, the optical characteristics (diffuse reflection light and internal reflection light) of the decorative coating film are close to the bare skin, and the aesthetic effect that the transparent feeling is increased and it feels beautiful. Play.

Hereinafter, the present invention will be described in more detail with specific examples, but the present invention is not limited to the following examples. Moreover, unless otherwise indicated, the compounding quantity in the following Examples etc. shows the mass%.

Oil-in-water emulsified sunscreen cosmetics having the compositions listed in Tables 1 to 4 below were prepared according to the method described in Paragraph 0078. For each sample, the emulsion stability and the change in absorbance before and after the water bath were measured.

Measurement of emulsification stability Samples of each example were stored for 2 weeks at 60 ° C., and the presence or absence of separation or sedimentation was visually observed. The measurement results were evaluated according to the following criteria.
A: Separation and sedimentation were not observed and it was stable.
B: Separation or sedimentation was observed.

・ Measurement of UV protection effect The sample of each example was dropped on an S plate (5 × 5 cm V-groove PMMA plate, SPFMASTER-PA01) in an amount of ² mg / cm ² , applied with a finger for 60 seconds, and dried for 15 minutes. The absorbance (500 to 280 nm) was measured with a U-3500 self-recording spectrophotometer manufactured by Hitachi, Ltd. Absorbance (Abs) was calculated by the following equation using an uncoated plate as a control.
Abs = -log (T / To)
T: Transmittance of sample, To: Transmittance when uncoated The measured plate was sufficiently immersed in water having a hardness of 50 to 500 and stirred in water as it was for 30 minutes (300 rpm with a 3-1 motor). Thereafter, the sample was dried for about 15 to 30 minutes until water droplets on the surface disappeared, the absorbance was measured again, and the Abs change rate (the following formula) was calculated as an effect of improving UV protection ability from the Abs integrated value before and after the water bath.
Absorbance change rate before and after water bath (%) =
(Absorbance integrated value after bathing) / (Absorbance integrated value before bathing) × 100
In the present invention, it is defined that the UV protection effect is improved when the absorbance change rate exceeds 100%.

From the results shown in Table 1, in Examples 1 to 4 in which an oil phase thickener ((palmitic acid / 2-ethylhexanoic acid) dextrin, hydrogenated palm oil, or petroleum jelly) was blended, the absorbance change rate before and after the water bath was 100. %, The same effect was obtained in Comparative Example 1 in which the oil phase thickener was not blended and in Comparative Example 2 in which the silicone coating agent was blended instead of the oil phase thickener. Was not obtained.

From the results shown in Table 2, the ratio [(B + C) / E] of the total amount of (B) oil phase thickener and (C) the hydrophobized powder and the amount of (E) non-volatile liquid oil is calculated. In Examples 5 to 10 in the range of 0.2 to 20, stable samples were obtained, and it was confirmed that the rate of change in absorbance before and after the water bath was improved by over 100%. However, in Comparative Example 3 in which the ratio [(B + C) / E] exceeds 20, a stable emulsion could not be obtained, and the absorbance could not be measured.

From the results shown in Tables 1 to 3, when polyoxyethylene hydrogenated castor oil is used as the nonionic surfactant, stable emulsification is possible regardless of whether the HLB is 14 (Tables 1 and 2) or 9 (Table 3). A product was obtained, the rate of change in absorbance before and after the water bath exceeded 100%, and the water resistance was also excellent. On the other hand, in the system not containing polyoxyethylene hydrogenated castor oil, the nonionic surfactant HLB can be emulsified with 7, but the absorbance change rate before and after the water bath is less than 100% (Comparative Example 4), and HLB = 5. No stable emulsion could be prepared in the system using the nonionic surfactant No. 5 (Comparative Example 5).
On the other hand, in place of or in addition to the nonionic surfactant, a cross-linked core-corona type microgel ((acrylates / methoxymethacrylic acid methoxy-PEG-90) crosspolymer) or non-crosslinked type Examples 12 to 15 using a core-corona type microgel (acrylamide-based core corona) were excellent in emulsification stability, the absorbance change rate before and after the water bath exceeded 100%, and further excellent in water resistance.

According to the results shown in Table 4, the surface treatment agent of the hydrophobized powder was changed to silicone (dimethicone), alkoxysilane (octyltriethoxysilane), dextrin fatty acid ester such as dextrin palmitate, fatty acid such as stearic acid, and silica. It was also confirmed that the effects of the present invention can be obtained.

A water-in-oil emulsified cosmetic with the formulation shown in Table 5 below was prepared in the same manner as in the other examples. About the sample of each example, the sweat (water bath) test was implemented to the panel of 10 persons on the following conditions.
After applying the sample of each example, whether the skin after spending 60 minutes in an environment of 30 ° C. and 80% humidity is more transparent and clearer than before the sweat (water bath) test (actual feeling) Presence or absence).

The results of the sweat (water bath) test were ranked according to the following criteria.
A: 8 or more out of 10 people feel B: 5 to 7 out of 10 people feel C: 4 or less out of 10 people feel

As shown in Table 5, in Examples 22 to 24 that met the requirements of the present invention, the skin on which makeup was applied looked more transparent and beautiful after sweat and contact with moisture. However, in Comparative Examples 6 and 7 that do not contain (B) an oil-soluble thickener, such a feeling was not obtained.

Hereinafter, other prescription examples of the oil-in-water emulsified cosmetic of the present invention will be given. The cosmetics of these formulation examples were also excellent in emulsification stability and water resistance, and in the case of sunscreen cosmetics, the rate of change in absorbance before and after the water bath exceeded 100%, and aesthetic effects such as being beautiful in the water bath were obtained.

Formulation Example 1 Sunscreen latex

Formulation Example 2 Sunscreen cream

Formulation Example 3 Makeup base

Formulation Example 4 Liquid foundation

Formulation Example 5 CC cream

Formulation Example 6 Liquid foundation

Claims (6)

1. (A) UV absorber,
   (B) oil phase thickener,
   (C) Hydrophobized powder,
   (D) a nonionic surfactant and / or a core-corona type microgel, and (E) a non-volatile liquid oil (including the (A) ultraviolet absorber),
   Ratio of total blending amount of (B) oil phase thickener and (C) hydrophobized powder to blending amount of (E) non-volatile liquid oil ([(B) + (C)] / (E)) Is an oil-in-water emulsified cosmetic, characterized in that
2. (B) The oil phase thickener is one or more selected from the group consisting of dextrin fatty acid esters, sucrose fatty acid esters, organically modified clay minerals, and solid or semi-solid hydrocarbon oils. Item 1. A cosmetic according to Item 1.
3. (C) The cosmetic according to claim 1 or 2, wherein the surface treatment agent of the hydrophobized powder is one or more selected from the group consisting of alkoxysilanes, dextrin fatty acid esters, fatty acids, and silica.
4. (D) The cosmetic according to any one of claims 1 to 3, wherein the nonionic surfactant contains polyoxyethylene hydrogenated castor oil.
5. (A) Cosmetics as described in any one of Claim 1 to 4 whose compounding quantity of a ultraviolet absorber is 1 mass% or more.
6. The cosmetic according to any one of claims 1 to 5, wherein the total amount of (B) the oil phase thickener and (C) the hydrophobized powder is 7.5 to 40% by mass.