KR102415538B1 - Underwater Type Oil Painting Cosmetics - Google Patents

Abstract

The present invention is an oil-in-water type emulsified cosmetic in which a powder is blended in an oil-resistant phase, and has unprecedented innovative properties, such as improving water resistance and improving UV protection effect compared to immediately after application by contact with water or sweat, and An object of the present invention is to provide a cosmetic excellent in usability and cleaning properties. The present invention relates to (A) a UV absorbent, (B) an oily thickener, (C) a hydrophobic treatment powder, (D) a nonionic surfactant and/or a core-corona type microgel, and (E) a nonvolatile oil (the above ( A) contains a UV absorber), and the ratio of the total blending amount of (B) oily thickener and (C) hydrophobic treatment powder to the blending amount of the (E) non-volatile liquid oil ([(B) + (C)) ]/(E)) is 0.2-20.

Description

Underwater Type Oil Painting Cosmetics

The present invention relates to an oil-in-water emulsified cosmetic. More specifically, it is an underwater type emulsified cosmetic that is formulated with a powder in a water-resistant phase, has excellent water resistance, and has characteristics that are not previously found in that UV protection effect is improved compared to immediately after application by contact with water or sweat, etc. it's about

Protecting the skin from the harm of ultraviolet rays is one of the important tasks in skin care and body care, and various UV care cosmetics are being developed in order to minimize the adverse effects of ultraviolet rays on the skin. One kind of UV care cosmetic, sunscreen cosmetic (sunscreen cosmetic), blocks UVA and UVB from reaching the skin by blending a UV absorber or UV scattering agent to protect the skin from UV rays (Non-Patent Document 1). Recently, it is not limited to harsh UV conditions in outdoor activities such as swimming in a swimming pool or the sea in summer or skiing in winter, but it is considered important to protect the skin from UV rays in daily life as well, and normal skin care cosmetics It is also required to have a UV protective effect.

As the formulation of sunscreen cosmetics, emulsified formulations are often used, and the instability of emulsification sometimes leads to a decrease in UV protection ability. In Patent Document 1, it is described that by blending a free fatty acid having 14 to 24 carbon atoms, the storage stability is improved and the decrease in the ultraviolet protective ability due to long-term storage is suppressed. However, even if the UV protection ability was maintained until just before use, if the UV protection cosmetic applied to the skin comes into contact with water or sweat, the UV absorber or UV scattering agent leaks out of the applied cosmetic, thereby reducing the UV protection effect. was considered not to exist.

Water-type emulsions are widely used as sunscreen cosmetics because they provide a fresh feel. However, the water-in-water type emulsified cosmetics often have poor water resistance compared to the water-in-oil type, and thus the UV protection ability is likely to be lowered due to the outflow of the UV absorber or UV scattering agent. In addition, it is known that water-type emulsified cosmetics in which powders such as UV scattering agents are blended in an oil-resistant phase are particularly poor in water resistance. And, as a result, there was also a problem of giving a sticky feeling of use.

In an oil-in-water type emulsion cosmetic, an attempt to improve water resistance by mix|blending a coating agent is also made|formed (patent document 2). However, cosmetics applied to the skin are exposed to various moisture from inside and outside the coating film, such as sweat secreted from the skin or moisture from the external environment such as seawater. It was difficult to completely stop the spillage of the spawning agent. Moreover, even when the outflow of a ultraviolet absorber etc. could be prevented completely, it was considered that the ultraviolet-ray protective effect obtained did not exceed immediately after application|coating.

Japanese Patent Laid-Open No. 2015-30723 Japanese Patent Laid-Open No. 2004-91377

『New Cosmetic Science』 2nd Edition, Edited by Takeo Mitsui, 2001, published by Nanzando, pp. 497-504

The present invention is the first to discover the phenomenon that the UV protection effect is not lowered by contact with water or sweat, etc. in the research process of developing a water-type emulsified UV protection cosmetic having a strong UV protection effect, but on the contrary, the effect is improved. depending on The oil-in-water type emulsified cosmetic of the present invention has a novel and innovative characteristic that is not conventionally improved, such as an ultraviolet protective effect, etc. by contact with water.

The inventors of the present inventors, as a result of repeated studies to solve the above problems, found that, in an oil-in-water emulsion cosmetic in which a powder was blended in an inner oil phase, an oil-phase thickener was blended, and the total blending amount of the oil-phase thickener and the hydrophobized powder was By adjusting the ratio of the blending amount of the nonvolatile oil within a specific range, it was found that water resistance and stability were improved, and the above new and innovative properties were exhibited, thereby completing the present invention.

That is, the present invention is

(A) a UV absorbent;

(B) an oily thickener;

(C) hydrophobic treatment powder;

(D) nonionic surfactants and/or core-corona microgels, and

(E) contains a non-volatile liquid oil (including the ultraviolet absorber (A) above);

(E) The ratio ([(B)+(C)]/(E)) of the total blending amount of the (B) oily thickener and (C) hydrophobic treatment powder to the blending amount of the nonvolatile liquid oil is 0.2 to 20 It is to provide an underwater type emulsified cosmetic.

(Effects of the Invention)

According to the present invention, by setting it as the above structure, the ultraviolet protective effect after contact with water, sweat, etc. is remarkably improved compared to immediately after the cosmetic is applied to the skin. That is, the water-in-water emulsified cosmetic according to the present invention has characteristics opposite to the conventional common sense that the UV protection effect is improved by contact with moisture, etc. It is an innovative sunscreen cosmetic. In addition, since the cosmetic coating film is uniformed by contact with water, the optical properties of the skin to which the cosmetic has been applied become closer to bare skin, and the aesthetic effect of increasing transparency and feeling clean is also exhibited.

In addition, the oil-in-water emulsion cosmetic of the present invention has excellent stability, and the water resistance of the cosmetic coating film is improved even without a high blending of a coating agent or the like. Therefore, there is no film feeling, good application at the time of use (at the time of application), and it is possible to easily remove it with a general-purpose cleaning agent or soap. That is, the present invention can provide an oil-in-water emulsified cosmetic which is excellent in usability and washability in addition to the specific UV protection effect and aesthetic effect.

As described above, the oil-in-water type emulsion cosmetic of the present invention, (A) a UV absorbent, (B) an oily thickener, (C) a hydrophobic treatment powder, (D) a nonionic surfactant and/or a core-corona type microgel, and (E) a non-volatile liquid oil. Hereinafter, an oil-in-water emulsified sunscreen cosmetic according to an embodiment of the present invention will be described in detail by taking as an example.

(A) UV absorber

(A) UV absorber (hereinafter, simply referred to as “component A”) to be formulated in the water-in-water emulsified cosmetic according to the present invention is at least one selected from UV absorbers that have been conventionally formulated in sunscreen cosmetics. can

The ultraviolet absorber (component A) used in the present invention is not particularly limited, and specific examples include 2-ethylhexyl para-methoxycinnamate, 2,4-bis-{[4-(2-ethylhexyloxy)-2 -Hydroxy]-phenyl}-6-(4-methoxyphenyl) 1,3,5-triazine, octocrylene, dimethicodiethylbenzalmalonate, polysilicon-15, t-butylmethoxydibenzoylmethane , ethylhexyltriazone, diethylaminohydroxybenzoylbenzoyl benzoate hexyl, bisethylhexyloxyphenol methoxyphenyltriazine, oxybenzone-3, methylenebisbenzotriazolyltetramethylbutylphenol, phenylbenzimidazolesulfonic acid, homosalate and organic ultraviolet absorbers such as ethylhexyl salicylate.

The blending amount of the ultraviolet absorber (component A) in the oil-in-water emulsified cosmetic of the present invention is 1% by mass or more, more preferably 1 to 40% by mass, still more preferably 2, relative to the total amount of the cosmetic in the case of a sunscreen cosmetic. -30 mass %. On the other hand, the ultraviolet absorber (component A) in the present invention also constitutes a part (or all) of the nonvolatile liquid oil (component E). For example, when sufficient UV protection ability can be ensured by the UV scattering agent stably maintained in the inner oil phase by blending a nonvolatile liquid component other than the UV absorber, the blending amount of the UV absorber is less than 6% by mass, for example , 5 mass % or less, 3 mass % or less, or 2 mass % or less is also possible.

(B) Oil phase thickener

(B) The oil phase thickener (hereinafter, sometimes simply referred to as “component B”) is a substance capable of adjusting the viscosity of the oil phase, for example, dextrin fatty acid ester, sucrose fatty acid ester, solid or semi-solid hydrocarbon oil; Organic modified clay minerals, fatty acids or salts thereof are preferable, and it is particularly preferable to mix two or more types selected from these.

The dextrin fatty acid ester is an ester of dextrin or reduced dextrin and a higher fatty acid, and is not particularly limited as long as it is generally used in cosmetics. It is preferable to use dextrin or reduced dextrin having an average degree of sugar polymerization of 3 to 100. In addition, as the fatty acid constituting the dextrin fatty acid ester, it is preferable to use a saturated fatty acid having 8 to 22 carbon atoms. Specific examples thereof include dextrin palmitic, dextrin oleate, dextrin stearate, dextrin myristic acid, and dextrin (palmitic acid/2-ethylhexanoic acid).

As the sucrose fatty acid ester, a linear or branched saturated or unsaturated fatty acid having 12 to 22 carbon atoms can be preferably used. Specifically, sucrose caprylic acid ester, sucrose capric acid ester, sucrose lauric acid ester, sucrose myristic acid ester, sucrose palmitic acid ester, sucrose stearic acid ester, sucrose oleic acid ester, sucrose erucic acid ester, etc. can be heard

The solid or semi-solid hydrocarbon oil is a solid or semi-solid hydrocarbon at room temperature (25° C.), and specific examples include vaseline, hydrogenated palm oil, hydrogenated castor oil (castor wax), hydrogenated palm kernel oil, hydrogenated castor oil, hydrogenated peanuts ( Peanut oil, hydrogenated rapeseed oil, hydrogenated camellia oil, hydrogenated soybean oil, hydrogenated olive oil, hydrogenated macadamia nut oil, hydrogenated sunflower oil, hydrogenated wheat germ oil, hydrogenated rice germ oil, hydrogenated rice bran oil, hydrogenated cottonseed oil, hydrogenated avocado oil, and wax can be heard

The organic modified clay mineral is a type of colloidal hydrous aluminum silicate having a three-layer structure, and a typical example is that the clay mineral represented by the following general formula (1) is modified with a quaternary ammonium salt type cationic surfactant.

(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. As a commercial item, Benton 27 (Hectorite treated with benzyl dimethyl stearyl ammonium chloride: made by Elementis Japan) and Bento 38 (Hectorite treated with distearyl dimethyl ammonium chloride: made by Elementis Japan) are preferable.

A fatty acid solid at room temperature can be used, for example, myristic acid, palmitic acid, stearic acid, behenic acid, etc. are mentioned. Examples of the fatty acid salt include calcium salts, magnesium salts and aluminum salts of these fatty acids.

(C) Hydrophobic treatment powder

The powder in the present invention (hereinafter also simply referred to as "component C") is a powder blended as a UV scattering agent, usable powder, and colorant in conventional sunscreen cosmetics, etc., and includes a powder subjected to surface hydrophobization. do. Although the ultraviolet scattering agent is not specifically limited, Preferably, powders, such as particulate-form metal oxide, for example, zinc oxide, titanium oxide, iron oxide, cerium oxide, tungsten oxide, are mentioned. As usable powder and color material, talc, mica titanium, etc. are mentioned, for example.

As the surface hydrophobicizing agent, those commonly used in the cosmetic field, for example, silicone such as dimethicone and alkyl-modified silicone, alkoxysilane such as octyltriethoxysilane, dextrin fatty acid ester such as dextrin palmitic acid, stearic acid, etc. Fatty acids, silica, and the like can be used. Among these, alkoxysilanes, such as octyltriethoxysilane, and the ultraviolet-ray scattering agent surface-hydrophobized with silica are especially preferable.

(D) nonionic surfactants and/or core-corona microgels

(D1) nonionic surfactant

The nonionic surfactant (hereinafter, sometimes referred to as "component D1") in the present invention may be one or two or more selected from the nonionic surfactants conventionally used for oil-in-water emulsified cosmetics, and among them, , those having an HLB of 6 or more are preferably used.

It is particularly preferable that the nonionic surfactant used in the present invention contains polyoxyethylene hydrogenated castor oil from the viewpoint of the stability of the formulation and the effect of improving the absorbance by contact with water. Specific examples of the 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, PEG-40 hydrogenated castor 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.

The compounding quantity of (D1) nonionic surfactant in this invention is 0.1-10 mass % with respect to the cosmetic whole quantity, Preferably it is 0.5-5 mass %, More preferably, it is 0.8-3 mass %. When the compounding quantity of component D1 is less than 0.1 mass %, sufficient stability is hard to be acquired, and when it mix|blends exceeding 10 mass %, it may be unpreferable from a usability point.

Moreover, it is preferable to mix|blend so that 50 mass % or more of component D1 may be occupied by polyoxyethylene hydrogenated castor oil, and the aspect which component D1 consists of polyoxyethylene hydrogenated castor oil is preferable.

(D2) Core-corona microgel

The core-corona microgel (hereinafter, sometimes referred to as "component D2") in the present invention is a fine gel particle in which a hydrophilic group (corona) is partially formed on the surface of a hydrophobic core. As the core-corona microgel in the present invention, either a crosslinked type or a non-crosslinked type can be used.

As particularly suitable core-corona microgels, crosspolymers [cross-linked core-corona microgels] and acrylamide-based core-corona microgels [non-cross-linked cores] as shown below (acrylates/methoxy methacrylate PGE) -Corona-type microgel] is exemplified.

1. Cross-linked core-corona microgel [(acrylate/methoxy methacrylic acid PGE-90) cross polymer)]

The crosslinked core-corona microgel according to this aspect 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 carbon atoms. X is H or CH ₃ .

As the polyethylene oxide macromonomer represented by the formula (1), for example, commercially available products sold by Aldrich, or Bremmer (registered trademark) sold by Nichiyu Corporation can be used.

The molecular weight of the polyethylene oxide moiety (that is, the value of n) needs to be n=8 to 200.

As such a macromonomer, Nichiyo Corporation Bremmer (trademark) PME-400, Bremmer (trademark) PME-1000, Bremmer (trademark) PME-4000, etc. are mentioned, for example.

R ₂ is an alkyl group having 1 to 3 carbon atoms.

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

The hydrophobic monomer represented by Formula (2) can use the commercial item marketed by Aldrich company or Tokyo Kasei company, for example.

Specific examples of the hydrophobic monomer of 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, methacrylic acid ethyl, propyl methacrylate, butyl methacrylate, pentyl methacrylate, hexyl methacrylate, heptyl methacrylate, octyl methacrylate, decyl methacrylate, dodecyl methacrylate, and the like. In particular, it is preferable to use methyl methacrylate, butyl methacrylate, and 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 of 0 to 2.

The crosslinkable monomer represented by Formula (3) can be obtained as a commercial item or an industrial raw material. It is preferable that this crosslinkable monomer is hydrophobic.

It is preferable that the value of m is 0-2. Specifically, it is preferable to use ethylene glycol dimethacrylate (hereinafter sometimes abbreviated as EGDMA) sold by Aldrich, Bremmer (registered trademark) PDE-50, or the like, sold by Nichiyu Corporation. .

The crosslinked core-corona microgel according to this embodiment is obtained by radical polymerization of the above monomers under the conditions (a1) to (e1) below.

(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 amount of the crosslinkable monomer added is 0.1 to 1.5% by mass based on the amount of the hydrophobic monomer.

(c1) The hydrophobic monomer represented by Formula (2) is a monomer composition which mixed 1 type, or 2 or more types of the methacrylic acid derivative which has a C1-C8 alkyl group.

(d1) When the polymerization solvent is a water-organic mixed solvent, and a polyol is used as the organic solvent, one or two or more selected from dipropylene glycol, 1,3-butylene glycol, and isoprene glycol.

(e1) The solvent composition of the mixed solvent of water-organic solvent is water:organic solvent=90-10:10-90 in mass ratio or volume ratio of 20 degreeC.

In addition, in this invention, "the amount of the crosslinkable monomer charged with respect to the 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 should be 0.1 to 1.5% by mass based on the amount of the hydrophobic monomer added according to the conditions of (b1).

Below, each condition is demonstrated in more detail.

・Condition (a1)

Polyethylene oxide macromonomer and the added molar amount of the hydrophobic monomer can be polymerized in the range of polyethylene oxide macromonomer:hydrophobic monomer = 1:10 to 1:250 (molar ratio). The molar amount added 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 a core-corona type microgel is not formed. In addition, 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 is incomplete, and the hydrophobic polymer by the insoluble hydrophobic monomer aggregates and precipitates.

・Condition (b1)

By copolymerizing the crosslinkable monomer, the microgel in which the hydrophobic polymer of the core portion is crosslinked can be polymerized.

When the amount of the crosslinkable monomer is less than 0.1% by mass of the amount of the hydrophobic monomer, the crosslinking density is low and the microgel disintegrates upon swelling. In addition, when the input amount exceeds 1.5% by mass, aggregation of the microgel particles occurs and suitable microgel particles having a narrow particle size distribution cannot be polymerized. 0.2-1.0 are preferable, as for the input amount of a crosslinking|crosslinked monomer, 0.2-0.8 are more preferable, 0.2-0.5 mass % is the most preferable.

・Condition (c1)

The hydrophobic monomer represented by Formula (2) needs to be the monomer composition which mixed 1 type, or 2 or more types of the methacrylic acid derivative which has a C1-C8 alkyl group. When carbon number is 0 (if it is a monomer without a terminal ester bond), a monomer becomes too hydrophilic, and emulsion polymerization may not be carried out well. On the other hand, when carbon number is 9 or more, it may become a steric hindrance at the time of polymerization, and a crosslinked structure may not be able to be built well.

・Condition (d1)

The polymerization solvent needs to be a mixed solvent of water-organic solvent. As the organic solvent, ethanol, propanol, butanol, polyol, etc. can be used, but when a polyol is used, it is preferable that the hydrophobic monomer represented by the formula (2) and the crosslinkable monomer represented by the formula (3) can be dissolved. . The polyol used in the present invention needs to be dipropylene glycol, 1,3-butylene glycol or isoprene glycol.

Considering that the polymerization solution is used as a raw material as it is without the need for a purification process such as dialysis, which is industrially producible, the solvent mixed with water is ethanol, propanol, butanol, etc., which are irritating when applied to the skin. It is suitable that it is not the organic solvent of concern but that it is a polyol which can be mix|blended with cosmetics universally.

・Condition (e1)

The solvent composition of the mixed solvent of water-organic solvent, which is the polymerization solvent, needs to be water:organic solvent=90-10:10-90 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.), water: organic solvent = 80 to 20: 20 to 80 (at 20 ° C.) capacity ratio) is more preferable.

In the polymerization solvent, it is necessary to add an organic solvent 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 by volume, the solubility of the hydrophobic monomer is extremely low, and polymerization proceeds in the state of the monomer drop, so that it becomes a large mass, and microgels are not formed. In addition, when the mixing ratio of the organic solvent exceeds 90 volume ratio, an emulsion of hydrophobic monomers due to hydrophobic interaction is not generated, and emulsion polymerization does not proceed, so that microgels cannot be obtained.

The core-corona microgel obtained by using polyol as an organic solvent is a water-polyol mixed solvent in which the polymerization solvent does not contain ethanol, and even users with sensitive skin can easily obtain cosmetics without skin irritation.

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

2.Non-crosslinked core-corona microgel [acrylamide-based 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.

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

The polyethylene oxide macromonomer represented by the formula (4) is preferably an acrylic acid derivative or a methacrylic acid derivative. For example, a commercial item marketed by Aldrich Co., Ltd. or a commercial item such as Bremmer (registered trademark) sold by Nichiyu Corporation can be used. As an example, PME-400, PME-1000, and PME-4000 which are methoxypolyethylene glycol monomethrate (n value in Formula (1) is n=9, n=23, n=90, all are Nichiyu, respectively. Co., Ltd. product) may be used.

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

The hydrophobic monomer represented by the formula (5) is preferably an acrylic acid derivative or a methacrylic acid derivative (also referred to as an "acrylate derivative monomer"), for example, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, acrylic acid. Pentyl, hexyl acrylate, heptyl acrylate, octyl acrylate, decyl acrylate, dodecyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, pentyl methacrylate, hexyl methacrylate, methacrylic acid Acid heptyl, octyl methacrylate, decyl methacrylate, dodecyl methacrylate, and the like can be used. Among them, methyl methacrylate (alias: methyl methacrylate), butyl methacrylate (alias: 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 company or Tokyo Kasei company.

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 including an alkyl group having 1 to 18 carbon atoms, preferably 1 to 12 carbon atoms.

The hydrophobic monomer represented by the formula (6) is preferably an acrylamide derivative or a methacrylamide derivative (also referred to as an "acrylamide derivative monomer"). For example, t-butylacrylamide, N,N-dimethylacrylamide, N-[3-(dimethylamino)propyl]acrylamide, t-butylmethacrylamide, octylacrylamide, octylmethacrylamide, octadecyl Acrylamide etc. can be used suitably. Of these, t-butylacrylamide, N,N-dimethylacrylamide, and N-[3-(dimethylamino)propyl]acrylamide are particularly suitable.

These hydrophobic monomers can be obtained as a commercial item or an industrial raw material.

The copolymer constituting the core-corona type microparticles according to the present invention comprises a macromonomer represented by the above formula (4) and a macromonomer represented by the above formula (4) by any radical polymerization method according to the conditions of (a2) to (d2) below; It is copolymerized with 1 type(s) or 2 or more types selected from the hydrophobic monomer represented by (5) and (6).

(a2) The molar ratio expressed by the charged molar amount of the polyethylene oxide macromonomer/(the acrylate derivative monomer and/or the acrylamide derivative monomer) added is 1:10 to 1:250.

(b2) 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,

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,

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 12 carbon atoms;

(c2) The polymerization solvent is a water-alcohol mixed solvent, and the alcohol is one or two 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 = 90-10:10-90 at a mass ratio of 20°C.

Below, each condition is demonstrated in more detail.

・Condition (a2)

The added molar amount of the polyethylene oxide macromonomer and the hydrophobic monomer (that is, the total of the acrylate derivative monomer and/or the acrylamide derivative monomer) is polyethylene oxide macromonomer: hydrophobic monomer = 1:10 to 1:250 (molar ratio). Polymerization is possible within the range. The molar amount added is preferably 1:10 to 1:200, more preferably 1:25 to 1:100.

When the molar amount of the hydrophobic monomer with respect to the molar amount of the polyethylene oxide macromonomer is less than 10 times, the polymer to be polymerized becomes water-soluble and core-corona-type particles are not formed. In addition, when the molar amount of the hydrophobic monomer with respect to the molar amount of the polyethylene oxide macromonomer exceeds 250 times, dispersion stabilization by the polyethylene oxide macromonomer is incomplete, and the hydrophobic polymer by the insoluble hydrophobic monomer aggregates and precipitates.

・Condition (b2)

Condition (b2) consists of three conditions (b2-1) to (b2-3) below.

(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. If the repeating unit is 7 or less, particles stably dispersed in a solvent may not be obtained.

(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. When carbon number is 0 (if it is a monomer without a terminal ester bond), an emulsion polymerization may not be able to be carried out well because a monomer is too hydrophilic. On the other hand, if carbon number is 13 or more, a preferable usability|use_condition may not be acquired.

(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 needs to have a monomer composition in which one or two or more selected from the acrylate derivative monomer represented by the formula (5) and the acrylamide derivative monomer represented by the formula (6) are mixed.

In this aspect, as a hydrophobic monomer, two types of methacrylate and butyl methacrylate, or methacrylate, t-butyl acrylamide, N,N- dimethyl acrylamide, and N-[3-(dimethylamino) It is especially preferable to use 4 types of propyl]acrylamide. In the combination of these hydrophobic monomers, it is also suitable to use methoxypolyethylene glycol monomethate as the macromonomer.

Although not limited thereto, as the most preferred combination of a macromonomer and a hydrophobic monomer in this aspect,

-Methoxypolyethylene glycol monomethacrylate, methacrylate, and butyl methacrylate in which the repeating units of the polyethylene glycol group are 8 to 90, most preferably 15;

Methoxypolyethylene glycol monomethacrylate, methacrylate, t-butylacrylamide, N,N-dimethylacrylamide, and N-[3- (dimethylamino) propyl] acrylamide, t-butyl methacrylamide, octyl acrylamide, octyl methacrylamide, and octadecyl acrylamide are mentioned.

・Condition (c2)

The polymerization solvent needs to be a water-alcohol mixed solvent. The alcohol is preferably one capable of dissolving the hydrophobic monomers represented by the formulas (5) and (6). Accordingly, one or two or more selected from ethanol, dipropylene glycol, 1,3-butylene glycol, and isoprene glycol is suitable.

・Condition (d2)

The solvent composition of the water-alcohol mixed solvent, which is the polymerization solvent, is preferably water:alcohol = 90 to 10:10 to 90 in a mass ratio or volume ratio of 20° C., more preferably water:alcohol = 80 to 20:20 to 80 to be. When the alcohol mixing ratio is lower than 10 by volume, the solubility of the hydrophobic monomer becomes extremely low, and micro particles may not be formed in some cases. In addition, when the alcohol mixing ratio exceeds 90 volume ratio, an emulsion of hydrophobic monomers due to hydrophobic interaction does not occur, emulsion polymerization does not proceed, and micro particles may not be obtained.

The core-corona microgel preferably used in the present invention is a microgel stabilized with polyethylene oxide chains, which are nonionic polymers, and acid resistance and salt resistance can be expected as the dispersion stability in water. In addition, it is believed that in the microgel, a core-corona type polymer microgel in which the hydrophilic macromonomer and the hydrophobic monomer are ordered in a solvent, the particle diameter is almost constant, and the core portion is crosslinked or non-crosslinked.

It is preferable that the blending amount of the core-corona microgel in the cosmetic of the present invention is usually 0.01 to 10 mass % (pure part) with respect to the total amount of the cosmetic. If the compounding quantity is less than 0.01 mass % (pure content), it may become difficult to obtain a stable cosmetic. When the blending amount exceeds 10% by mass (pure content), it may be undesirable from the viewpoint of stability in long-term storage under high-temperature conditions, or the feeling of use may be poor.

The core-corona microgel emulsifies the oil phase component and the aqueous phase component to form an oil-in-water type emulsion composition having a structure in which the core-corona microgel emulsifier is adsorbed on the oil droplets of the oil phase component dispersed in the aqueous phase component. The core-corona microgel emulsifier as described above has excellent emulsifying power, and when used as an emulsifier, it becomes an in-water type emulsion composition having extremely excellent stability. In addition, the core-corona 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

The oil-in-water emulsion cosmetic of the present invention contains (E) a non-volatile liquid oil.

As used herein, the term "non-volatile liquid oil" refers to a component that does not show volatility at normal temperature (25°C) and atmospheric pressure (1 atm (9.8×10 ⁴ Pa)) (for example, has a boiling point of about 200°C or higher at normal pressure). is included), which has fluidity at room temperature and pressure, and is liquid rather than solid, and includes silicone oil and nonvolatile oils other than silicone oil (hydrocarbon oil, ester oil, etc.).

The oily ultraviolet absorber corresponding to the said component A is contained in (E) non-volatile liquid oil in this invention. Accordingly, the present invention includes (1) the aspect in which the nonvolatile liquid oil (component E) contains nonvolatile liquid components other than the ultraviolet absorber, and (2) the aspect in which the component E consists only of the ultraviolet absorber.

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

Specific examples include palm oil, flaxseed oil, camellia oil, macadamia nut oil, corn oil, olive oil, avocado oil, sandflower oil, castor oil, safflower seed oil, apricot seed 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, glyceryl triisopalmitate liquid maintenance such as; Octanoic acid esters such as cetyl octanoate, isooctanoic acid esters such as glyceryl tri-2-ethylhexanoate and tetra-2-ethylhexanoic acid pentaerythrite, lauric acid esters such as hexyl laurate, iso myristic acid Myristic acid ester such as propyl and octyldodecyl myristate, palmitic acid ester such as octyl palmitate, stearic acid ester such as isocetyl stearate, isostearic acid ester such as isopropyl isostearate, isopalmit Isopalmitic acid ester such as octyl acid, oleic acid ester such as isodecyl oleate, adipic acid diester such as diisopropyl adipate, sebacic acid diester such as diethyl sebacate, and ester such as diisostearyl malate you; hydrocarbon oils such as liquid paraffin and squalane; Silicone oils, such as polyoxybutylene polyoxypropylene glycol and polydimethylsiloxane, are mentioned.

Ratio of [total blending amount of component B and component C]/[compounding amount of component E]

The cosmetic of the present invention is an oil-in-water type emulsified cosmetic, and contains a powder in the inner oil phase. In such a powder-in-oil-in-water emulsion, it tends to be difficult to obtain a stable emulsion when the viscosity of the inner oil phase is high. However, in the present invention, the ratio of the total blending amount of (B) oil phase thickener and (C) hydrophobic treatment powder and (E) nonvolatile liquid oil ((A) UV absorber included) constituting the inner oil phase ([B] +C/E]) within a predetermined range, a stable emulsion can be obtained, and a unique effect of improving the UV protection ability by contact with water is exhibited.

In the oil-in-water type emulsion cosmetic of the present invention, the total blending amount of (B) oily thickener and (C) hydrophobic treatment powder and (E) non-volatile liquid oil ((A) UV absorbent is included) The ratio of the blending amount ([B +C/E]) must be within the range of 0.2 to 20.

In addition, it is preferable that the total blending amount of (B) oily thickener and (C) hydrophobic treatment powder is 7.5 to 40 mass % with respect to the total amount of cosmetics, and (E) the blending amount of non-volatile liquid oil is [B+C/E]= It is possible to appropriately adjust within a range satisfying the conditions of 0.2 to 20.

In the oil-in-water emulsion cosmetic of the present invention, in addition to the above essential components, components normally used in cosmetics may be blended as optional components within the range not impairing the effects of the present invention.

Examples of the optional component include a volatile oil, and the volatile oil that can be blended in the present invention includes a volatile hydrocarbon oil, a volatile silicone oil, and a lower alcohol such as ethanol.

The volatile hydrocarbon oil component is not particularly limited as long as it is a hydrocarbon oil having volatility at room temperature (25° C.) conventionally used for cosmetics and the like. As a specific example, isododecane, isohexadecane, hydrogenated polyisobutene, etc. are mentioned, for example.

Examples of volatile silicone oils include silicone oils volatile at room temperature (25° C.) that have been conventionally used in cosmetics and the like, such as volatile linear silicone oil (volatile dimethicone) and volatile cyclic silicone oil (volatile cyclomethicone). is included As the 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 made by Shin-Etsu Chemical Co., Ltd.). . Examples of the volatile cyclomethicone include decamethylcyclopentasiloxane (D5).

As another optional component, a water-soluble or oil-soluble coating agent is exemplified. By blending the coating agent, it is possible to further increase the resistance to (A) the ultraviolet absorbent agent or (C) the outflow of the hydrophobic treatment powder or the rubbing caused by clothing or the like. However, it is preferable to make the compounding quantity into the range in which the film feeling (usability) and washing|cleaning property do not fall.

The coating agent is not particularly limited as long as it is commonly used in cosmetics, and specifically, polyvinylpyrrolidone (PVP), PVP/dimethylaminoethyl methacrylic acid copolymer, PVP/eicocene copolymer, PVP/ethyl methacrylate / PVP-based coating agents such as methacrylic acid copolymer, PVP/hexadecene copolymer, PVP/VA copolymer, PVP/vinyl acetate/itaconic acid copolymer, and styrene/PVP copolymer; Ethyl acrylate/amide acrylate/acrylic acid copolymer, ethyl acrylate/butyl acrylate copolymer, ethyl acrylate/ethyl methacrylate copolymer, ethyl acrylate/methacrylic acid copolymer, ethyl acrylate/methyl methacrylate copolymer, octyl acrylate/ Vinyl acetate copolymer, octyl acrylate/styrene copolymer, butyl acrylate/vinyl acetate copolymer, butyl acrylate/hydroxyethyl methacrylate copolymer, butyl acrylate/methyl methacrylate copolymer, methoxyethyl acrylate/hydroxyacrylic acid acrylic acid-based coating agents such as ethyl/butyl acrylate copolymer, lauryl acrylate/vinyl acetate copolymer, ethyl polyacrylate, butyl polyacrylate, and polystyrene acrylic acid resin; vinyl acetate-based coating agents such as polyvinyl acetate; methacrylic acid-based coating agents such as polymethyl methacrylate, methyl methacrylate/butyl acrylate/octylic acid acrylate, and vinylpyrrolidone diethylsulfate/N,N'-dimethylaminomethacrylic acid copolymer; vinyl methyl ether-based coating agents such as vinyl methyl ether/ethyl maleate copolymer and vinyl methyl ether/butyl maleate copolymer; styrene-based coating agents such as styrene/methylstyrene/indene copolymer; alkyd resin-based coating agents such as cyclohexane-based alkyd resins; and silicone resin-based coating agents such as trimethylsiloxysilicic acid.

As other optional ingredients, ingredients commonly used in cosmetics, for example, whitening agents, moisturizing agents, antioxidants, oil-based active agents, surfactants, water-based thickeners, usable powders (excluding those treated with hydrophobicity), colorants, water-based active agents, etc. can

As a usable powder and color material as an optional component, those normally blended in makeup cosmetics such as pigments and pearl pigments can be used. 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 (iron sulfate, ocher) ), inorganic black pigments (black iron oxide, carbon, low-order titanium oxide), inorganic purple pigments (mango violet, cobalt violet), inorganic green pigments (chromium oxide, chromium hydroxide, cobalt titanate), inorganic blue pigments (ultramarine blue) , blue blue), pearl pigment (titanium oxide-coated mica, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, colored titanium oxide-coated mica, bismuth oxychloride, young gourd), metallic powder pigment (aluminum powder, kappa powder), organic Pigment (Red No. 202, Red No. 205, Red No. 220, Red No. 228, Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, Blue No. 404), Zirconium, Barium, Aluminum Lake Organic Pigments (Red No. 3, Red No. 104, Red No. 227, Red No. 401, Orange No. 205, Yellow No. 4, Yellow No. 202, Green No. 3, Blue No. 1), natural pigments (chlorophyll, carotenoids (β-carotene) ), cartamine, cochineal, chalcone, curcumin, betanin, flavonol, flavone, anthocyanidin, anthraquinone, naphthoquinone), functional pigment (boron nitride, photochromic pigment, synthetic fluoride mica, iron-containing synthetic fluorophorite mica, fine particle composite powder (hybrid fine powder)), etc., but are not limited thereto. The usability powder and the color material can be blended, for example, by one type or a combination of two or more types 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 surfactant is added to a part of the oily component in which the oil phase thickener is dissolved to form a UV scattering agent. It can be prepared by dissolving or dispersing, adding it to an aqueous component, emulsifying it with a homomixer or the like, and finally adding the remaining oily component and powder and stirring and mixing (shear force may be optionally added during stirring).

The oil-in-water emulsion cosmetic 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 form of a sunscreen cosmetic was demonstrated, this invention is not limited to this form. For example, a new type of makeup cosmetic or skin care cosmetic in which properties (transparency, color development, unevenness correction effect, etc.) are changed by contact with water by blending a pearl agent, a colorant (pigment), etc. with the cosmetic of the present invention as a base it is possible to do with Cosmetics of this aspect have a new characteristic that, on the contrary, the makeup effect or skin care effect is improved by contact with sweat or moisture. This property is observed even in (A) a sunscreen cosmetic containing 1% by mass or more of a UV absorber, (A) a cosmetic in which the blending amount of the UV absorber is less than 1% by mass, or a cosmetic that does not contain a UV absorber (Table 4) and formulation examples 5 and 6).

That is, the present invention is

(A1) 1% by mass or less of an ultraviolet absorbent;

(B) an oily thickener;

(C) hydrophobic treatment powder;

(D) nonionic surfactants and/or core-corona microgels, and

(E) contains a non-volatile liquid oil (including the ultraviolet absorber (A) above);

(E) The ratio ([(B)+(C)]/(E)) of the total blending amount of the (B) oily thickener and (C) hydrophobic treatment powder to the blending amount of the nonvolatile liquid oil is 0.2 to 20 It also includes an aspect of an underwater type emulsified cosmetic.

Components (A) to (E) in the invention of this aspect are the same as those described for the sunscreen cosmetic. However, the compounding quantity of (A) ultraviolet absorber may be less than 1 mass %, for example, 0.5 mass % or less, 0.3 mass % or less, or 0.1 mass % or less, and does not need to contain a ultraviolet absorber.

The oil-in-water emulsion cosmetic of the present invention is characterized in that the cosmetic coating film (film thickness) is uniformed by contact with water. Although not meant to limit the present invention, the present inventors have thought that the distribution (density) of the ultraviolet absorbent in the direction perpendicular to the skin in the cosmetic coating film on the skin becomes uniform over the entire coating film, and as a result, the ultraviolet protective ability is improved. have. This phenomenon is not limited to a ultraviolet absorber, It is thought that it contributes also to the uniformity of distribution of the mix|blended various components. Therefore, when the film is uniform in contact with moisture due to sweating or the like, the optical properties (diffuse reflected light and internally reflected light) of the cosmetic coating film are close to the bare skin, and the translucency is increased and an aesthetic effect of feeling clean is exhibited.

Example

The present invention will be described in more detail with reference to specific examples below, but the present invention is not limited to the following examples. In addition, the compounding quantity in a following example etc. shows mass % unless otherwise stated.

In accordance with the method described in Paragraph 0078, an oil-in-water type emulsified sunscreen cosmetic having the composition shown in Tables 1 to 4 below was prepared. For the samples of each example, the emulsion stability and the change in absorbance before and after water bathing were measured.

・Measurement of emulsion stability

The samples of each example were stored under 60 degreeC conditions for 2 weeks, and the presence or absence of separation or sedimentation was visually observed. The following reference|standard evaluated the measurement result.

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 is dropped in an amount of 2 mg/cm 2 dropwise on the S plate (5×5 cm V-groove PMMA plate, SPFMASTER-PA01), applied with a finger for 60 seconds, dried for 15 minutes, and then the absorbance (500-280 nm) is measured. Measurements were made with a U-3500 type magnetic recording spectrophotometer manufactured by Hitachi, Ltd. An uncoated plate was used as a control, and the absorbance (Abs) was calculated by the following formula.

Abs=-log(T/To)

T: transmittance of the sample, To: transmittance when uncoated

The measured plate was sufficiently immersed in water having a hardness of 50 to 500 and stirred as it was in water for 30 minutes (300 rpm with a 3-1 motor). After that, it was dried for about 15 to 30 minutes until the water droplets on the surface disappeared, the absorbance was measured again, and the Abs change rate (the following formula) was calculated as the UV protection ability improvement effect from the integrated Abs values before and after water bathing.

Absorbance change rate before and after water bathing (%) =

(integrated absorbance value after water bath)/(integrated absorbance value before water bath) x 100

In addition, in the present invention, when the absorbance change rate exceeds 100 (%), it is defined that the ultraviolet protective effect is improved.

From the results in Table 1, in Examples 1 to 4 in which an oily thickener ((palmitic acid/2-ethylhexanoic acid) dextrin, hydrogenated palm oil, or vaseline) was blended, the change in absorbance before and after water bathing was improved to more than 100%. Although the characteristic effect was obtained, the same effect was not obtained in Comparative Example 1 which did not mix|blend an oil-phase thickener, and Comparative Example 2 which mix|blended the silicone type film agent instead of an oil-phase thickener.

From the results shown in Table 2, the ratio [(B+C)/E] of the total blending amount of (B) oily thickener and (C) hydrophobic treatment powder and (E) nonvolatile liquid oil is in the range of 0.2 to 20. In Examples 5 to 10, it was confirmed that stable samples were obtained, and the rate of change in absorbance before and after water bathing exceeded 100% and improved. However, in Comparative Example 3 in which the ratio [(B+C)/E] exceeded 20, a stable emulsion was not obtained, and the measurement of absorbance was also impossible.

From the results shown in Tables 1 to 3, when polyoxyethylene hydrogenated castor oil is used as the nonionic surfactant, stable emulsions are obtained with HLB of 14 (Tables 1 and 2) and 9 (Table 3), before and after water bath The rate of change in absorbance also 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 can be emulsified at an HLB of 7, but the absorbance change rate before and after water bathing does not reach 100% (Comparative Example 4), and the ratio of HLB = 5.5 A stable emulsion could not be prepared in a system using an ionic surfactant (Comparative Example 5).

On the other hand, instead of or in addition to the nonionic surfactant, a crosslinked core-corona type microgel ((acrylate/methoxy methacrylic acid PEG-90) crosspolymer) or a non-crosslinked type core-corona Examples 12 to 15 in which microgels (acrylamide-based core corona) were used were excellent in emulsion stability, the absorbance change rate before and after water bathing exceeded 100%, and also excellent in water resistance.

According to the results shown in Table 4, even if the surface treatment agent of the hydrophobicized powder is changed to silicone (dimethicone), alkoxysilane (octyltriethoxysilane), dextrin fatty acid esters such as dextrin palmitic acid, fatty acids such as stearic acid, and silica It was confirmed that the effect of this invention was acquired.

In the formulations shown in Table 5 below, water-in-oil emulsified cosmetics were prepared in the same manner as in other Examples. About the sample of each example, a sweating (water bath) test was implemented by 10 panelists under the following conditions.

After applying the samples in each example, the skin after 60 minutes in an environment with a temperature of 30 ° C and a humidity of 80% was evaluated whether or not it felt transparent and clean compared to before the sweating (water bath) test (whether or not there was a real feeling). .

The results of the sweating (water bath) test were ranked according to the following criteria.

A: More than 8 out of 10 people feel it

B: More than 5 out of 10 people, but less than 7 people

C: Less than 4 out of 10 people feel it

As shown in Table 5, in Examples 22 to 24, which satisfy the requirements of the present invention, after contact with moisture by sweating, the skin to which the makeup was applied appeared more transparent and clear. However, (B) Comparative Examples 6 and 7 not containing the oil-soluble thickener such a feeling was not obtained.

Below, another formulation example of the oil-in-water type emulsion cosmetic of this invention is given. Cosmetics of these formulation examples are also excellent in emulsion stability and water resistance, and in the case of sunscreen cosmetics, the absorbance change rate before and after water bathing exceeds 100%, and aesthetic effects such as a clear look by water bathing were obtained.

Prescription Example 1. Sunscreen lotion

Prescription Example 2. Sunscreen cream

Prescription Example 3. Makeup Base

Prescription Example 4. Liquid Foundation

Prescription Example 5. CC Cream

Prescription Example 6. Liquid Foundation

Claims (8)

(A) a UV absorbent;
(B) an oily thickener;
(C) hydrophobic treatment powder;
(D) (D1) a nonionic surfactant and/or (D2) a core-corona microgel, and
(E) contains a non-volatile liquid oil (including the above (A) ultraviolet absorbent);
The (D1) nonionic surfactant is, PEG-20 hydrogenated castor oil, PEG-25 hydrogenated castor oil, PEG-30 hydrogenated castor oil, PEG-40 hydrogenated castor oil, PEG-50 hydrogenated castor oil, PEG-60 hydrogenated castor oil It contains at least one selected from free, PEG-80 hydrogenated castor oil, and PEG-100 hydrogenated castor oil,
The ratio ([(B)+(C)]/(E)) of the total blending amount of the (B) oily thickener and (C) hydrophobic treatment powder to the blending amount of the (E) non-volatile liquid oil is 0.2 to 20,
However, the blending amount of the (E) non-volatile liquid oil component includes the blending amount of the ultraviolet absorber (A). The method of claim 1,
(B) Cosmetics in which the oily thickener is 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. 3. The method according to claim 1 or 2,
(C) One or two or more types of cosmetics selected from the group consisting of alkoxysilanes, dextrin fatty acid esters, fatty acids, and silica as the surface treatment agent of the hydrophobized powder. 3. The method according to claim 1 or 2,
(A) Cosmetics in which the compounding quantity of a ultraviolet absorber is 1 mass % or more. 4. The method of claim 3,
(A) Cosmetics in which the compounding quantity of a ultraviolet absorber is 1 mass % or more. 3. The method according to claim 1 or 2,
(B) A cosmetic in which the total blending amount of the oily thickener and (C) the hydrophobized powder is 7.5 to 40 mass%. 4. The method of claim 3,
(B) A cosmetic in which the total blending amount of the oily thickener and (C) the hydrophobized powder is 7.5 to 40 mass%. 5. The method of claim 4,
(B) A cosmetic in which the total blending amount of the oily thickener and (C) the hydrophobized powder is 7.5 to 40 mass%.