JP7043803B2 - Underwater oil type emulsified cosmetic - Google Patents

Description

The present invention relates to an oil-in-water emulsified cosmetic having an excellent sunscreen effect.

In recent years, the importance of sunscreen measures in daily life has been pointed out, and even for cosmetics that have a protective effect against ultraviolet rays, an oil-in-water emulsified sunscreen cosmetic that is easy to use continuously with a refreshing feel. Has been developed.

In these oil-in-water emulsified cosmetics, an ultraviolet absorber and a metal oxide powder such as zinc oxide and titanium oxide are used in order to enhance the ultraviolet protection effect. However, when a large amount of metal oxide powder is blended, there is a problem that not only the powder aggregates and precipitates with time, but also the stability with time such as viscosity decrease, emulsification separation and precipitation occurs.

In order to improve these problems, oil-in-water emulsified cosmetics using a water-soluble polymer such as polyacrylic acid amide, xanthan gum, (sodium acrylate / acryloyldimethyltaurine) copolymer (see Patent Documents 1 and 2), An oil-in-water emulsified composition (see Patent Document 3) containing a side-chain type amino-modified silicone and an amphipathic substance having an HLB of 5 or less compatible with the silicone oil in an oil phase containing a silicone oil as a main component has been proposed. There is.

Japanese Patent Application Laid-Open No. 2003-104859 Japanese Unexamined Patent Publication No. 2010-215602 Japanese Unexamined Patent Publication No. 2009-209123

The oil-in-water emulsified compositions described in Patent Documents 1 to 3 have improved the stability over time of the oil-in-water emulsified composition, but have a problem that a sufficient UV protection effect cannot be obtained.
To solve this problem, it is considered that sufficient UV protection ability can be exhibited by adding a high amount of liquid oil that can dissolve and disperse organic UV absorbers and metal oxide powders. It has been found that the water resistance and sweat resistance are deteriorated, the UV protection effect (durability) in actual use is lowered, and the coating film is easily deformed and disintegrated due to friction.
Therefore, an object of the present invention is to provide an oil-in-water emulsified cosmetic having an excellent ultraviolet protection effect, good temporal stability, good water resistance, and excellent friction resistance.

The present inventors use a specific amount of liquid oil having an IOB value in a specific range, a salt-resistant water-soluble polymer, and a hydrophobized fine metal oxide powder, and the liquid of the hydrophobicized fine metal oxide powder. When the content mass ratio to the oil agent is within a specific range, it is possible to obtain an oil-in-water emulsified cosmetic that can obtain high stability over time, has excellent UV protection ability, and has extremely good water resistance and abrasion resistance. And completed the present invention.

That is, the present invention is an oil-in-water emulsified cosmetic containing the following components (A) to (C).
(A) Liquid oil containing an oil-soluble organic ultraviolet absorber (B) Salt-resistant water-soluble polymer (C) Hydrophobization-treated fine particle metal oxide powder (A) 40 components having an IOB value of 0.10 or more among the components It contains 3% by mass or more and 30% by mass or less of the component (A) in the total amount of cosmetics, and the content mass ratio (C / A) of the component (C) to the component (A) is 0.4 or more. An oil-in-water emulsified cosmetic that is 1.0 or less.

The oil-in-water emulsified cosmetic of the present invention has an excellent ultraviolet protection effect, good stability over time, good water resistance, and excellent abrasion resistance.

The present invention is an oil-in-water emulsified cosmetic containing the following components (A) to (C).
(A) Liquid oil containing an oil-soluble organic ultraviolet absorber (B) Salt-resistant water-soluble polymer (C) Hydrophobization-treated fine particle metal oxide powder (A) 40 components having an IOB value of 0.10 or more among the components It contains 3% by mass or more and 30% by mass or less of the component (A) in the total amount of cosmetics, and the content mass ratio (C / A) of the component (C) to the component (A) is 0.4 or more. An oil-in-water emulsified cosmetic having a mass of 1.0 or less.

In the present invention, "liquid" refers to a state of having fluidity under an environment of 1 atm and 25 ° C., that is, a state of having a temperature condition equal to or higher than the melting point (having no melting point). In the case of amorphous substances, it means a state under temperature conditions above the melting point). Further, the "solid state" means a state of having no fluidity under an environment of 1 atm and 25 ° C., that is, a state of being under a temperature condition below the melting point (non-melting point). In the case of crystalline substances, it means a state under temperature conditions below the melting point).
In the present invention, the "IOB value" means the ratio of the inorganic value (IV) to the organic value (OV) in the organic conceptual diagram, that is, "inorganic value (IV) / organic value (OV)". The organic conceptual diagram is divided into two factors, organic (covalent bond) based on the number of carbon atoms and inorganic (ionic bond) based on the substituent, and mapped on the orthogonal coordinates named the organic axis and the inorganic axis. It is known as one of the indexes for predicting the properties of organic compounds.
In the present invention, "oil-soluble" means that the solubility in water is 1 w / w% or less.

[Component (A): Liquid oil containing oil-soluble organic UV absorber]
The oil-in-water emulsified cosmetic of the present invention contains (A) a liquid oil containing an oil-soluble organic ultraviolet absorber. (A) The liquid oil agent is an oil agent having fluidity at 25 ° C. under 1 atm as described above.
The component (A) contains an oil-soluble organic ultraviolet absorber in order to enhance the ultraviolet protection effect. Examples of the oil-soluble organic ultraviolet absorber include one or more selected from a liquid organic ultraviolet absorber and a solid organic ultraviolet absorber. In the present invention, from the viewpoint of further enhancing the ultraviolet protection effect, it is preferable to contain a liquid organic ultraviolet absorber and a solid organic ultraviolet absorber in the component (A).

Liquid organic UV absorbers include 2-ethylhexyl paramethoxycinnamate, 2-ethoxyethyl paramethoxycinnamate, isopropyl diisopropyl cinnamic acid ester mixture of paramethoxycinnamic acid, and methylbis trimethoxycinnamate (trimethyl). Syroxy) Cyril isopentyl, amyl paradimethylamino acid benzoate, 2-ethylhexyl paradimethylamino acid benzoate, ethylene glycol salicylate, 2-ethylhexyl salicylate, benzyl salicylate, homomentyl salicylate, octocrylene, dimethyldiethylbenzalmaronate and the like. Of these, 2-ethylhexyl paramethoxycinnamate, 2-ethylhexyl salicylate, homomentyl salicylate, octocrylene, and dimethyldiethylbenzalmaronate are preferable, and paramethoxycinnamate is more preferable because it can improve the emulsified state and stability over time. 2-Ethylhexyl sulphate, octocrylene, dimethyldiethylbenzalmaronate, more preferably 2-ethylhexyl paramethoxycinnamate. The liquid organic ultraviolet absorber may be contained alone or in combination of two or more as appropriate. The liquid organic ultraviolet absorber may be contained in the component (A) even as a liquid oil.

Examples of the solid organic ultraviolet absorber include 2- (4-diethylamino-2-hydroxybenzoyl) benzoic acid hexyl ester and 2,4-bis {[4- (2-ethylhexyloxy) -2-hydroxy] phenyl}. -6- (4-Methoxyphenyl) -1,3,5-triazine, 2,4,6-tris [4- (2-ethylhexyloxycarbonyl) anilino] -1,3,5-triazine, 4-tert- Included are butyl-4'-methoxydibenzoylmethane and 2-ethylhexyl dimethoxybenzilidendioxoimidazolidine propionate. The solid organic ultraviolet absorber may be contained alone or in combination of two or more.
Of these, preferably 2- (4-diethylamino-2-hydroxybenzoyl) benzoic acid hexyl ester, 2,4-bis {[4- (2-ethylhexyloxy) -2-hydroxy] phenyl} -6-( 4-Methoxyphenyl) -1,3,5-triazine, 2,4,6-tris [4- (2-ethylhexyloxycarbonyl) anilino] -1,3,5-triazine, and 4-tert-butyl-4 '-Methoxydibenzoylmethane, more preferably 2- (4-diethylamino-2-hydroxybenzoyl) benzoic acid hexyl ester, 2,4-bis {[4- (2-ethylhexyloxy) -2-hydroxy] Phenyl} -6- (4-methoxyphenyl) -1,3,5-triazine, and 2,4,6-tris [4- (2-ethylhexyloxycarbonyl) anilino] -1,3,5-triazine. .. It is considered that the solid organic ultraviolet absorber in the present invention exists in a liquid state in cosmetics.

Examples of commercially available products of these components include UVINUL MC80 (2-ethylhexyl paramethoxysilicate; manufactured by BASF), UVINUL APLUS (2- (4-diethylamino-2-hydroxybenzoyl) benzoic acid hexyl ester; BASF). , TINOSORBS (2,4-bis {[4- (2-ethylhexyloxy) -2-hydroxy] phenyl} -6- (4-methoxyphenyl) -1,3,5-triazine; manufactured by BASF), UVINULT-150 (2,4,6-tris [4- (2-ethylhexyloxycarbonyl) anilino] -1,3,5-triazine; manufactured by BASF), soft shade DH (dimethoxybenzylidendioxoimidazolidinepropionic acid 2) -Ethylhexyl; manufactured by Ajinomoto Co., Ltd.), PARSOL1789 (4-tert-butyl-4'-methoxydibenzoylmethane; manufactured by DSM) and the like.

The oil agent other than the organic ultraviolet absorber contained in the component (A) is not particularly limited as long as it is liquid in an environment of 1 atm and 25 ° C., and examples thereof include oil agents used in ordinary cosmetics. .. Specifically, hydrocarbon oils such as α-olefin oligomer, liquid isoparaffin, liquid paraffin, squalane; glyceryl trioctanoate, avocado oil, olive oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed oil, Triglycerides such as castor oil, cottonseed oil, minced oil; fatty acids such as oleic acid and isostearic acid; isopropyl myristate, butyl myristate, isopropyl palmitate, ethyl oleate, ethyl linoleate, isopropyl linoleate, cetyl caprylate, lauric acid Hexil, decyl myristate, decyl oleate, oleyl oleate, isostearyl laurate, isotrideyl myristate, isosetyl myristate, isostearyl myristate, octyldodecyl myristate, octyl palmitate, isosteyl palmitate, isostearyl palmitate, Propyl glycol dioleate, Isodecyl oleate, isopropyl isostearate, cetyl 2-ethylhexanate, stearyl 2-ethylhexanoate, propylene glycol dicaprate, propylene glycol dioleate, glyceryl tri2-ethylhexanate, tri (capril caprin) Acids) Ester oils such as glyceryl, triethylhexanoin, isononyl isononanoate, diisopropyl sebacate, propylene glycol isostearate, alkyl benzoate; branched or unsaturated higher alcohols such as 2-octyldodecanol, isostearyl alcohol, oleic alcohol ; Dimethylpolysiloxane and the like can be mentioned. The oil agent may be contained alone or in combination of two or more.
Of these, isopropyl palmitate, isocetyl myristate, cetyl 2-ethylhexanoate, glyceryl tri2-ethylhexanoate, glyceryl tri (capril capric acid) glyceryl, triethylhexanoin, isononyl isononanoate, diisopropyl sebacate, It is propylene glycol isostearate, alkyl benzoate C12-15, and more preferably isopropyl palmitate, triethylhexanoin, isononyl isononanoate, diisopropyl sebacate, alkyl benzoate C12-15.

The component (A) contains 40% by mass or more of a component having an IOB value of 0.10 or more, preferably an IOB value of 0.10 or more and 0.60 or less, and more preferably an IOB value of 0.10. It contains 40% by mass or more of the components of 0.40 or less. By containing 40% by mass or more of the component having an IOB value of 0.10 or more in the component (A), the solid organic ultraviolet absorber is dissolved in the liquid oil agent (A) while adjusting the oiliness. It is possible to improve the sex, and it is possible to enhance the ultraviolet protection effect.

Specific examples of the components having an IOB value of 0.10 or more include oleic acid (IOB value = 0.42), isostearic acid (IOB value = 0.43), and isopropyl myristate (IOB value = 0.18). ), Butyl myristate (IOB value = 0.17), Isopropyl palmitate (IOB value = 0.16), Ethyl oleate (IOB value = 0.16), Cetyl caprylate (IOB value = 0.13), Hexyl laurate (IOB value = 0.17), decyl myristate (IOB value = 0.13), decyl oleate (IOB value = 0.11), isostearyl laurate (IOB value = 0.10), myristin Isotridecyl acid acid (IOB value = 0.11), isosetyl myristate (IOB value = 0.10), isostearyl myristate (IOB value = 0.10), octyl palmitate (IOB value = 0.13), dioleic acid Propropylene glycol (IOB value = 0.16), Isodecyl oleate (IOB value = 0.11), Isopropyl isostearate (IOB value = 0.15), Cetyl 2-ethylhexanoate (IOB value = 0.13), Stearyl 2-ethylhexanate (IOB value = 0.12), propylene glycol dicaprate (IOB value = 0.26), glyceryl tri2-ethylhexanoate (IOB value = 0.35), tri (capryl capric acid) ) Glyceryl (IOB value = 0.33), triethylhexanoin (IOB = 0.35), isononyl isononanoate (IOB value = 0.12), diisopropyl sebacate (IOB value = 0.4), propylene glycol isostearate (IOB value = 0.4), Alkyl benzoate C12-15 (IOB value = 0.184), 2-octyldodecanol (IOB value = 0.26), Isostearyl alcohol (IOB value = 0.29), Oleyl alcohol (IOB value = 0.28), 2-ethylhexyl paramethoxysilicate (IOB value = 0.28), 2- (4-diethylamino-2-hydroxybenzoyl) benzoic acid hexyl ester (IOB value = 0) .68), 2,4-bis {[4- (2-ethylhexyloxy) -2-hydroxy] phenyl} -6- (4-methoxyphenyl) -1,3,5-triazine (IOB value = 0.43) ), 2,4,6-Tris [4- (2-ethylhexyloxycarbonyl) anilino] -1,3,5-triazine (IOB value = 0.55), dimethoxybenzilidendioxoimidazole Examples thereof include 2-ethylhexyl lysinepropionic acid (IOB value = 1.00), 4-tert-butyl-4'-methoxydibenzoylmethane (IOB value = 0.47) and the like.

The content ratio of the component having an IOB value of 0.10 or more contained in the component (A) is 40% by mass or more, preferably 60% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more. It is more preferably 95% by mass or more, and more preferably 100% by mass or less. Specifically, 40 to 100% by mass is preferable, 60 to 100% by mass is more preferable, 80 to 100% by mass is further preferable, 90 to 100% by mass is further preferable, and 95 to 100% by mass is further preferable.
The content ratio of the component having an IOB value of 0.10 or more and 0.60 or less contained in the component (A) is preferably 40% by mass or more, more preferably 50% by mass or more, still more preferably 65% by mass or more. Also, it is preferably 100% by mass or less, more preferably 99% by mass or less, still more preferably 95% by mass or less. Specifically, 40 to 100% by mass is preferable, 50 to 99% by mass is more preferable, and 65 to 95% by mass is further preferable.

The content of the component (A) with respect to the total amount of cosmetics is 3% by mass or more and 30% by mass or less from the viewpoint of excellent water resistance and abrasion resistance and maintaining the ultraviolet protection effect. The content of the component (A) is preferably 5% by mass or more, more preferably 10% by mass or more, more preferably 15% by mass or more, preferably 25% by mass or less, and more preferably 20% by mass or less. Specifically, it is 3 to 30% by mass, preferably 5 to 25% by mass, more preferably 10 to 20% by mass, still more preferably 15 to 20% by mass.

The content of the oil-soluble organic ultraviolet absorber with respect to the component (A) is preferably 30% by mass or more, more preferably 40% by mass or more, further preferably 50% by mass or more, and preferably 80% by mass or less, preferably 75% by mass. % Or less is more preferable, and 70% by mass or less is further preferable. Specifically, 30 to 80% by mass is preferable, 40 to 75% by mass is more preferable, and 50 to 70% by mass is further preferable. Within the range, the UV protection effect can be enhanced while reducing the liquid oil content.

The content of the liquid organic ultraviolet absorber with respect to the component (A) is preferably 15% by mass or more, more preferably 25% by mass or more, further preferably 35% by mass or more, and preferably 60% by mass or less, preferably 55% by mass. The following is more preferable, and 50% by mass or less is further preferable. Specifically, 15 to 60% by mass is preferable, 25 to 55% by mass is more preferable, and 35 to 50% by mass is further preferable. Within the range, a good UV protection effect can be obtained, and stability over time and a feeling of use are also good.

The content of the solid organic ultraviolet absorber with respect to the component (A) is preferably 10% by mass or more, more preferably 12% by mass or more, further preferably 15% by mass or more, and preferably 35% by mass or less, preferably 30% by mass. % Or less is more preferable, and 25% by mass or less is further preferable. Specifically, 10 to 35% by mass is preferable, 12 to 30% by mass is more preferable, and 15 to 25% by mass is further preferable. Within the range, a good UV protection effect can be obtained, and stability and usability are also good.

The content of the solid organic UV absorber with respect to the total amount of the oil-soluble organic UV absorber is preferably 10% by mass or more, more preferably 20% by mass or more, further preferably 25% by mass or more, and further preferably 60% by mass or less. It is preferable, 50% by mass or less is more preferable, and 40% by mass or less is further preferable. Specifically, 10 to 60% by mass is preferable, 20 to 50% by mass is more preferable, and 25 to 40% by mass is further preferable. Within the range, a good UV protection effect can be obtained, and stability and usability are also good.

[Component (B): salt-tolerant water-soluble polymer]
The oil-in-water emulsified cosmetic of the present invention contains (B) a salt-tolerant water-soluble polymer.
Examples of the (B) salt-tolerant water-soluble polymer used in the present invention include polyacrylamide, acrylamide-based copolymers, and hydrophobically modified polyether polyurethanes. (B) The salt-tolerant water-soluble polymer can be contained alone or in combination of two or more.
In the present invention, the "water-soluble polymer" means a polymer that swells and exerts a thickening effect when mixed with water. Further, "salt resistance" refers to a property that viscoelasticity does not extremely decrease even if a salt or a metal oxide is added within the range of being blended in cosmetics.
Examples of the acrylamide-based copolymer include copolymers containing acrylamide and / or acryloyldimethyltaurine as a constituent unit.

Polymers containing acrylamide and / or acryloyldimethyltaurine as a constituent unit include a copolymer of hydroxyethyl acrylate and acryloyldimethyltaurine salt, a copolymer of acrylate and acryloyldimethyltaurine salt, and acrylamide and acrylate. Examples thereof include a copolymer of acrylic acid, acrylamide, an acrylate and an acryloyldimethyltaurine salt, a copolymer of vinylpyrrolidone and an acryloyldimethyltaurine salt, and the like.
More specifically, (hydroxyethyl acrylate / Na acryloyldimethyltaurine) copolymer, (Na acrylate / Na acryloyldimethyltaurine) polymer, (acrylamide / ammonium acrylate) polymer, and (acrylic acid / acryloyldimethyltaurine / dimethyl) Acrylic acid / acrylamide / Na acrylic acid / Acryloyldimethyltaurine Na copolymer, (Acryloyldimethyltaurinammonium / Behenez methacrylate-25) crosspolymer, (Acryloyldimethyl) Taurine ammonium / steareth methacrylate-25) crosspolymer and the like can be mentioned.

Examples of commercially available products of these components include SEPIGEL501 (polyacrylamide, polysorbate 85, mineral oil, isoparaffin), SEPIGEL 305 (polyacrylamide, hydrogenated polyisobutene (or (C13,14) isoparaffin)) and laureth-as polyacrylamide. 7, Water); As acrylamide-based polymers, SEPINOV EMT 10 ((hydroxyethyl acrylate / acryloyldimethyltaurine Na) polymer), SIMULGEL NS ((hydroxyethyl acrylate / acryloyldimethyltaurine Na) polymer, squalane, polysorbate 60, Water), SIMULGEL FL ((Hydroxyethyl Acrylate / Acryloyldimethyltaurine Na) Polymer, Isohexadecane, Polysorbate 60, Water), SEPIPLUS S ((Hydroxyethyl Acrylate / Acryloyldimethyltaurine Na) Polymer, Polyisobutene, PEG-7 Tri Methylol propane coconut oil alkyl ether, water), SIMULGEL EG ((Na acrylate / Na acryloyldimethyltaurine) polymer, isohexadecane, polysorbate 80, water), SEPIPLUS 265 ((acrylamide / ammonium acrylate) polymer, polyisobutene, polysorbate 20) , Water), SEPIPLUS 400 (Acrylic Acid / Acrylamide / Na Acrylic Acid / Acryloyldimethyltaurine Na) Polymer, Polyisobutene, Polysorbate 20, Water), Aristflex AVC ((Acryloyldimethyltaurinammonium / Vinylpyrrolidone) Polymer), Aristflex HMB ((() Acrylamide dimethyltaurinammonium / Acrylamide behenez-25) crosspolymer), Aristoflex HMS ((acrylamidedimethyltaurineammonium / acrylateless-25) crosspolymer); As a hydrophobically modified polyether polyurethane, Avalure flex-6 ((PEG-). 240 / decyltetradeceth-20 / HDI) copolymer, Trideceth-6).

Of these, a copolymer of an acrylate and an acryloyldimethyltaurine salt is preferable, and a (Na acrylate / Na acryloyldimethyltaurine) copolymer is more preferable.

The content of the component (B) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and 0. 8% by mass or more is more preferable. Further, 4% by mass or less is preferable, 3.5% by mass or less is more preferable, and 2.5% by mass or less is further preferable. The specific content is preferably 0.1 to 4% by mass, more preferably 0.5 to 4% by mass, more preferably 0.8 to 3.5% by mass, and more preferably 0.8 to 2.5% by mass. More preferred.

[Component (C): Hydrophobicized fine particle metal oxide powder]
The oil-in-water emulsified cosmetic of the present invention contains (C) hydrophobized fine particle metal oxide powder.
The (C) hydrophobized fine metal oxide powder used in the present invention has one or more metal oxidations selected from zinc oxide, titanium oxide and cerium oxide because of its high effect of scattering ultraviolet rays. It is preferable to use a powder. Further, these metal oxide powders can contain trace elements of +2 valence or more, and the above-mentioned metal such as iron, zirconium, calcium, manganese, magnesium, yttrium can be contained alone or in combination of two or more kinds as appropriate. It can be contained in fine metal oxide powder.

Examples of the fine zinc oxide powder include FINEX-25, FINEX-50, FINEX-75 (manufactured by Sakai Chemical Industry Co., Ltd.), MZ500 series, MZ700 series (manufactured by Teika Co., Ltd.), ZnO-350 (manufactured by Sumitomo Osaka Cement Co., Ltd.). ) Etc. are commercially available, and flaky zinc oxide powder described in Japanese Patent No. 3073887 can also be mentioned. As the fine particle titanium oxide powder, TTO-55 series, TTO-51 series (manufactured by Ishihara Sangyo Co., Ltd.), JR series, JA series (manufactured by TAYCA Corporation) and the like are commercially available. The fine particle cerium oxide includes high-purity cerium sold by Nikki or Seimi Chemical. Of these, it is preferable to use fine particle zinc oxide powder or fine particle titanium oxide powder.

The average particle size of the fine particle metal oxide powder used in the present invention is preferably 0.01 μm or more, more preferably 0.012 μm or more, still more preferably 0.015 μm or more from the viewpoint of preventing powder aggregation. Further, from the viewpoint of preventing opacity of the pharmaceutical product, 1 μm or less is preferable, 0.5 μm or less is more preferable, and 0.4 μm or less is further preferable. The specific average particle size is preferably 0.01 to 1 μm, more preferably 0.012 to 0.5 μm, and even more preferably 0.015 to 0.4 μm. The average particle size is measured by a laser diffraction / scattering method.

Examples of the shape of the fine particle metal oxide powder used in the present invention include a spherical shape, a flaky shape, a rod shape, a spindle shape, a needle shape, an indefinite shape, and the like, and any shape can be used as long as the average particle diameter is within the above range. Can be used.

The hydrophobization treatment for the fine metal oxide powder is not particularly limited, and various surface treatments such as fluorine compound treatment, silicone treatment, pendant treatment, silane coupling agent treatment, titanium coupling agent treatment, and oil agent treatment are performed. , N-acylated lysine treatment, polyacrylic acid treatment, metal soap treatment, amino acid treatment, inorganic compound treatment, plasma treatment, mechanochemical treatment, silane compound, silazane compound and the like can be used for surface treatment in advance.

For example, treatment with a silicone surface treatment agent, treatment with a surface treatment agent for methylhydrogenpolysiloxane or a methylhydrogenpolysiloxane / dimethylpolysiloxane copolymer of the following formula (1), a silane compound or a silazane compound. Treatment with the surface treatment agent of the above is preferably mentioned. Among them, preferably, surface treatment using silicone, surface treatment using methylhydrogenpolysiloxane, surface treatment using silane compound or silazane compound, more preferably surface treatment using methylhydrogenpolysiloxane, silane compound or It is a surface treatment using a silane compound.

(In the formula, m and n are integers, 1 ≦ m + n ≦ 60)

As the surface treatment using the silicone, as described in Japanese Patent No. 3187440, a silicone compound composed of an organopolysiloxane and a silicone resin containing a metal oxide such as zinc oxide powder (excluding the silane compound). A method of coating the metal oxide surface with silicon oxide by coating with at least one of the above in a non-gas phase state and then firing at a temperature of 600 to 950 ° C. in an oxygen-containing atmosphere can be mentioned.

As the silane compound or the silazane compound, a silane compound or a silazane compound having an alkyl group or a fluoroalkyl group having 1 to 20 carbon atoms and having a reactivity with an inorganic oxide is preferable, and specifically, the following general formula (2). ), Or a silazane compound represented by the general formula (3), and one or more of these can be used.

RR ¹ _p SiX _3-p (2)
(P is an integer of 0 or 1, R indicates an alkyl group or a fluoroalkyl group having 1 to 20 carbon atoms (which may be a straight chain or a branched chain), and R ¹ has 1 carbon atom. It represents an alkyl group of up to 6 and X represents a halogen atom or an alkoxy group having 1 to 4 carbon atoms.)

R ² R ³ R ⁴ SiNHSiR ⁵ R ⁶ R ⁷ (3)
( ^R2 to ^R7 each independently indicate an alkyl group or a fluoroalkyl group having 1 to 20 carbon atoms (which may be a straight chain or a branched chain).)

Specific examples of the silane compound include hexyltrimethoxysilane, octyltrimethoxysilane, decyltrimethoxysilane, octadecyltrimethoxysilane, octyltriethoxysilane, trifluoropropyltrimethoxysilane, and heptadecafluorodecyltrimethoxysilane. Be done. Of these, octyltriethoxysilane and octyltrimethoxysilane are particularly preferable. Preferred examples of the silazane compound include hexamethyldisilazane and octyldisilazane, and among these, octyldisilazane is particularly preferable. The silane compound or the silazane compound is characterized by being easy to treat uniformly, easy to supply, and inexpensive in terms of cost, and further, a cosmetic containing (C) fine particle metal oxide powder surface-treated with these compounds. Is preferable because it has excellent properties such as dispersibility.

As a method for treating the silane compound or the silazane compound, the silane compound or the silazane compound is mixed with a metal oxide such as zinc oxide powder in an organic solvent such as n-hexane, cyclohexane or lower alcohol, and finely pulverized in some cases. After that, the organic solvent is removed by heating or reduced pressure, and the silane compound or the silazane compound is chemically reacted with a reactive group on the surface of a metal oxide such as zinc oxide, preferably by heat treatment at 80 to 250 ° C. There is a way to make it.

Further, as described in JP-A-2007-326902, there is also a method of surface-treating an alkylalkoxysilane in water after coating a cosmetic pigment with a specific polysiloxane compound.

The amount of the surface treatment agent coated on the fine particle metal oxide powder is preferably 3% by mass or more, more preferably 5% by mass or more, and preferably 15% by mass or less, preferably 10% by mass, based on the total amount of these powders used. % Or less is more preferable. The specific coating amount is preferably 3 to 15% by mass, more preferably 5 to 10% by mass. Within this range, the surface treatment agent is uniformly coated on the surface of these powders, and the surface treatment agent does not aggregate or precipitate on the surface of the metal oxide powder such as zinc oxide.

The content of the (C) hydrophobized fine particle metal oxide used in the present invention is preferably 8% by mass or more, more preferably 9% by mass or more, still more preferably 10% by mass or more, and further preferably 10% by mass or more, based on the total amount of cosmetics. 25% by mass or less is preferable, 23% by mass or less is more preferable, and 20% by mass or less is further preferable. As a specific content, 8 to 25% by mass is preferable, 9 to 23% by mass is more preferable, and 10 to 20% by mass is further preferable. Within this range, the dispersibility of the powder is good, and there is no problem that the viscosity of the pharmaceutical product increases significantly.

(C) As the hydrophobized fine particle metal oxide, containing 60% by mass or more of the hydrophobized fine particle zinc oxide powder in the component (C) leads to improvement of UVA protection ability and improvement of high temperature stability. preferable.

In the present invention, the content mass ratio (C / A) of the component (C) to the component (A) is 0.4 or more and 1.0 in order to improve the friction resistance and obtain good stability over time. It is necessary to do the following. The mass ratio of the component (C) to the component (A) may be 0.4 or more and 1.0 or less, preferably 0.5 or more, more preferably 0.6 or more, and 0.7 or more. Further preferable, 0.98 or less is preferable, 0.95 or less is more preferable, and 0.93 or less is further preferable. Specifically, 0.5 to 1.0 is preferable, 0.6 to 1.0 is more preferable, 0.6 to 0.97 is further preferable, 0.6 to 0.95 is further preferable, and 0.6 is more preferable. ~ 0.93 is more preferable.

The oil-in-water emulsified cosmetic of the present invention preferably contains a water-soluble polymer other than the component (B) as the component (D) from the viewpoint of improving usability and stability over time. As the water-soluble polymer other than the components (D) and (B), xanthan gum is preferable. The content thereof is preferably 0.01% by mass or more, preferably 0.05% by mass or more, preferably 5% by mass or less, and more preferably 1% by mass or less with respect to the total amount of cosmetics. The specific content is preferably 0.01 to 5% by mass, more preferably 0.05 to 1% by mass.

The oil-in-water emulsified cosmetic of the present invention contains (E) a saturated monohydric alcohol having 1 to 3 carbon atoms, which enhances the spreadability at the time of application, suppresses stickiness, stabilizes over time, and is water resistant. , It is preferable from the viewpoint of enhancing sweat resistance. (E) Examples of the saturated monohydric alcohol having 1 to 3 carbon atoms include ethyl alcohol, propyl alcohol and isopropyl alcohol. These saturated monohydric alcohols having 1 to 3 carbon atoms can be used alone or in combination of two or more.

The content of the component (E) of the present invention is not particularly limited, but it is possible to improve the elongation at the time of application, suppress the sticky feeling, and improve the stability over time, water resistance, and sweat resistance. With respect to the total amount of the material, 3% by mass or more is preferable, 4% by mass or more is more preferable, 6% by mass or more is further preferable, 20% by mass or less is preferable, 15% by mass or less is more preferable, and 12% by mass or less is 12% by mass or less. More preferred. The specific content is preferably 3 to 20% by mass, more preferably 4 to 15% by mass, and further preferably 6 to 12% by mass.

It is preferable that the oil-in-water emulsified cosmetic of the present invention contains (F) a polyhydric alcohol from the viewpoint of improving the moisturizing property and the good spreadability at the time of application. Examples of the component (F) include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (average molecular weight less than 650), propylene glycol, dipropylene glycol, polypropylene glycol (average molecular weight less than 650), isoprene glycol, 1,3-. Glycols such as butylene glycol; glycerin, diglycerin, polyglycerin and the like. Of these, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol and glycerin can be preferably used, and more preferably dipropylene glycol, 1,3-butylene glycol and glycerin. These polyhydric alcohols can be used alone or in combination of two or more as appropriate.

The content of the component (F) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, based on the total amount of cosmetics, from the viewpoint of enhancing the moisturizing property and the good spreadability at the time of application. It is more preferably mass% or more, more preferably 30% by mass or less, still more preferably 20% by mass or less, still more preferably 15% by mass or less, still more preferably 10% by mass or less. As a specific content, 0.1 to 30% by mass is preferable, 0.5 to 20% by mass is more preferable, 0.5 to 15% by mass is further preferable, and 1 to 15% by mass is further preferable. It is more preferably to 10% by mass.

The oil-in-water emulsified cosmetic of the present invention may contain a surfactant for the purpose of adjusting the feeling of use and stability over time. The surfactant is not particularly limited, and includes nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, natural surfactants, polyether-modified silicones, siloxane derivatives and the like. Any of a silicone-containing surfactant, a surfactant containing a perfluoroalkyl group, and the like can be used, and one or more of these can be used.

Among these surfactants, nonionic surfactants, polyether-modified silicones, and silicone-containing surfactants are preferable, and specifically, sorbitan monoisostearate, dimethiconecopolyol, and polyoxyethylene hydrogenated castor oil (EO). Average number of added moles 60), polyoxyethylene hydrogenated castor oil (average number of added moles of EO 40), polyoxyethylene castor oil (average number of added moles of EO 40), polyoxyethylene sorbitan monolaurate (average number of added moles of EO 20) , Polyoxyethylene monostearate (20 average EO moles), polyoxyethylene sorbitan oleate (20 average EO moles), polyoxyethylene (7 average EO moles) lauryl ether, polyoxyethylene (EO) Average number of moles added 7) Trimethylol Propane palm oil Alkyl ether and the like can be mentioned.

The oil-in-water emulsified cosmetic of the present invention has good usability and stability over time without using the above-mentioned surfactant, and when a large amount of the surfactant is added, a sticky feeling derived from the surfactant is generated. The amount of the surfactant to be blended is preferably 3% by mass or less, more preferably 1% by mass or less, still more preferably 0.1% by mass or less, based on the total amount of the cosmetic. As a specific range, 0 to 3% by mass is preferable, 0 to 1% by mass is more preferable, and 0 to 0.5% by mass is further preferable.

The oil-in-water emulsified cosmetic of the present invention may contain an emulsifier for the purpose of adjusting the feeling of use and stability over time. Examples of the emulsifier include dextrin palmitate, Behenes-2 and the like.
The blending amount of the emulsifier is preferably 3% by mass or less, more preferably 2% by mass or less, still more preferably 1% by mass or less, based on the total amount of cosmetics. As a specific range, 0 to 3% by mass is preferable, 0 to 2% by mass is more preferable, and 0 to 1% by mass is further preferable.

In the oil-in-water emulsified cosmetic of the present invention, the content of water is 40% by mass or more with respect to the total amount of the oil-in-water emulsified cosmetic from the viewpoint of forming an oil-in-water emulsified composition having excellent stability over time. Is preferable, 45% by mass or more is more preferable, 75% by mass or less is preferable, and 70% by mass or less is more preferable. Specifically, it is preferably 40 to 75% by mass, and more preferably 45 to 70% by mass.

In addition to the above components, the oil-in-water emulsified cosmetic of the present invention contains higher alcohols, fatty acids, esters, sterols, and sterol fatty acids within a range that does not impair the effects of the present invention. Esters, hydrocarbons, fats and oils, silicone oils, moisturizers, plant extracts, vitamins, antioxidants, antibacterial preservatives, anti-inflammatory agents, insect repellents, physiologically active ingredients, salts, chelating agents, neutralizing agents , A pH adjuster, a fragrance, etc. can be blended.

The oil-in-water emulsified cosmetic of the present invention can be suitably used as a hair cosmetic such as shampoo, conditioner and conditioner, and a skin cosmetic such as a washing pigment, a cleansing cosmetic, a sunscreen cosmetic, a pack and a massage cosmetic. Of these, it is particularly preferable to apply it to sunscreen cosmetics (skin water, cream, milky lotion, beauty essence, etc.), suntanning, makeup base cosmetics, foundations having an ultraviolet protective ability, and the like.
The dosage form of the oil-in-water emulsified cosmetic of the present invention can be applied to liquid, milky, creamy, paste, solid, multi-layered, etc., and also as a sheet, spray, and mousse. Applicable.

With respect to the above embodiments, the present invention further discloses the following embodiments.

[1] An oil-in-water emulsified cosmetic containing the following components (A) to (C).
(A) Liquid oil containing an oil-soluble organic ultraviolet absorber (B) Salt-resistant water-soluble polymer (C) Hydrophobization-treated fine particle metal oxide powder (A) 40 components having an IOB value of 0.10 or more among the components It contains 3% by mass or more and 30% by mass or less of the component (A) in the total amount of cosmetics, and the content mass ratio (C / A) of the component (C) to the component (A) is 0.4 or more. An oil-in-water emulsified cosmetic that is 1.0 or less.
[2] The oil-in-water emulsified cosmetic according to [1], wherein the component (A) is preferably one or more selected from a liquid organic ultraviolet absorber and a solid organic ultraviolet absorber. ..
[3] The liquid organic ultraviolet absorber is preferably one or more selected from 2-ethylhexyl paramethoxycinnamate, 2-ethylhexyl salicylate, homomentyl salicylate, octocrylene, and dimethyldiethylbenzalmalonate. The oil-in-water emulsified cosmetic according to [1] or [2], which is contained.
[4] The solid organic ultraviolet absorber is preferably 2- (4-diethylamino-2-hydroxybenzoyl) benzoic acid hexyl ester, 2,4-bis {[4- (2-ethylhexyloxy) -2. -Hydroxy] phenyl} -6- (4-methoxyphenyl) -1,3,5-triazine, 2,4,6-tris [4- (2-ethylhexyloxycarbonyl) anilino] -1,3,5-triazine , And one or more selected from 4-tert-butyl-4'-methoxydibenzoylmethane, more preferably 2- (4-diethylamino-2-hydroxybenzoyl) benzoic acid hexyl ester, 2,4- Bis {[4- (2-ethylhexyloxy) -2-hydroxy] phenyl} -6- (4-methoxyphenyl) -1,3,5-triazine, and 2,4,6-tris [4- (2- (2-) The oil-in-water emulsified cosmetic according to any one of [1] to [3], which contains one or more selected from (ethylhexyloxycarbonyl) anilino] -1,3,5-triazine.
[5] As an oil agent other than the organic ultraviolet absorber contained in the component (A), preferably isopropyl palmitate, isocetyl myristate, cetyl 2-ethylhexanoate, glyceryl tri2-ethylhexanate, tri (capryl). Capric acid) glyceryl, triethylhexanoin, isononyl isononanoate, diisopropyl sebacate, propylene glycol isostearate, alkyl benzoate C12-15, 2-ethylhexyl paramethoxysilicate, more preferably isopropyl palmitate, triethyl. Hexanoin, isononyl isononanoate, diisopropyl sebacate, alkyl benzoate C12-15 isopropyl palmitate, isocetyl myristate, cetyl 2-ethylhexanoate, glyceryl tri2-ethylhexanoate, glyceryl tri (capril capric acid), triethyl One or more selected from hexanoin, isononyl isononanoate, diisopropyl sebacate, propylene glycol isostearate, alkyl benzoate C12-15, more preferably isopropyl palmitate, triethylhexanoin, isononyl isononanoate, sebasic acid. The oil-in-water emulsified cosmetic according to any one of [1] to [4], which contains one or more selected from diisopropyl and alkyl benzoate C12-15.
[6] The component (A) preferably contains 40% by mass or more of a component having an IOB value of 0.10 or more and 0.60 or less, and more preferably an IOB value of 0.10 or more and 0.40 or less. ] To [5]. The oil-in-water emulsified cosmetic according to any one of.
[7] The content of the component having an IOB value of 0.10 or more contained in the component (A) is 40% by mass or more, preferably 60% by mass or more, more preferably 80% by mass or more, still more preferably 90. The oil-in-water emulsified cosmetic according to any one of [1] to [6], which is by mass or more, more preferably 95% by mass or more, and preferably 100% by mass or less.
[8] The content ratio of the component having an IOB value of 0.10 or more contained in the component (A) is preferably 40 to 100% by mass, more preferably 60 to 100% by mass, and further preferably 80 to 100% by mass. %, More preferably 90 to 100% by mass, still more preferably 95 to 100% by mass, according to any one of [1] to [7].
[9] The content ratio of the component having an IOB value of 0.10 or more and 0.60 or less contained in the component (A) is preferably 40% by mass or more, more preferably 50% by mass or more, still more preferably 65% by mass. % Or more, preferably 100% by mass or less, more preferably 99% by mass or less, still more preferably 95% by mass or less, according to any one of [1] to [8]. ..
[10] The content ratio of the component having an IOB value of 0.10 or more and 0.60 or less contained in the component (A) is preferably 40 to 100% by mass, more preferably 50 to 99% by mass, and further preferably. The oil-in-water emulsified cosmetic according to any one of [1] to [9], which is 65 to 95% by mass.
[11] The content of the component (A) with respect to the total amount of cosmetics is preferably 5% by mass or more, more preferably 10% by mass or more, more preferably 15% by mass or more, and preferably 25% by mass or less, more preferably. Is 20% by mass or less, the oil-in-water emulsified cosmetic according to any one of [1] to [10].
[12] The content of the component (A) with respect to the total amount of cosmetics is preferably 5 to 25% by mass, more preferably 10 to 20% by mass, still more preferably 15 to 20% by mass, [1] to [ 11] The oil-in-water emulsified cosmetic according to any one of.
[13] The content of the oil-soluble organic ultraviolet absorber with respect to the component (A) is preferably 30% by mass or more, more preferably 40% by mass or more, still more preferably 50% by mass or more, and preferably 80% by mass or more. The oil-in-water emulsified cosmetic according to any one of [1] to [12], which is more preferably 75% by mass or less, still more preferably 70% by mass or less.
[14] The content of the oil-soluble organic ultraviolet absorber with respect to the component (A) is preferably 30 to 80% by mass, more preferably 40 to 75% by mass, and further preferably 50 to 70% by mass. [1] ] To [13]. The oil-in-water emulsified cosmetic according to any one of [13].
[15] The content of the liquid organic ultraviolet absorber with respect to the component (A) is preferably 15% by mass or more, more preferably 25% by mass or more, still more preferably 35% by mass or more, and preferably 60% by mass or less. The oil-in-water emulsified cosmetic according to any one of [1] to [14], more preferably 55% by mass or less, still more preferably 50% by mass or less.
[16] The content of the liquid organic ultraviolet absorber with respect to the component (A) is preferably 15 to 60% by mass, more preferably 25 to 55% by mass, still more preferably 35 to 50% by mass, [1]. The oil-in-water emulsified cosmetic according to any one of [15].
[17] The content of the solid organic ultraviolet absorber with respect to the component (A) is preferably 10% by mass or more, more preferably 12% by mass or more, still more preferably 15% by mass or more, and preferably 35% by mass or less. The oil-in-water emulsified cosmetic according to any one of [1] to [16], more preferably 30% by mass or less, still more preferably 25% by mass or less.
[18] The content of the solid organic ultraviolet absorber with respect to the component (A) is preferably 10 to 35% by mass, more preferably 12 to 30% by mass, still more preferably 15 to 25% by mass, [1]. ] To [17]. The oil-in-water emulsified cosmetic according to any one of [17].
[19] The content of the solid organic UV absorber with respect to the total amount of the oil-soluble organic UV absorber is preferably 10% by mass or more, more preferably 20% by mass or more, still more preferably 25% by mass or more, and more preferably 25% by mass or more. The oil-in-water emulsified cosmetic according to any one of [1] to [18], which is 60% by mass or less, more preferably 50% by mass or less, still more preferably 40% by mass or less.
[20] The content of the solid organic UV absorber with respect to the total amount of the oil-soluble organic UV absorber is preferably 10 to 60% by mass, more preferably 20 to 50% by mass, still more preferably 25 to 40% by mass. The oil-in-water emulsified cosmetic according to any one of [1] to [19].
[21] The component (B) preferably contains a copolymer of an acrylate and an acryloyldimethyltaurine salt, and more preferably a (Na acrylate / Na acryloyldimethyltaurine) copolymer. 20] The oil-in-water emulsified cosmetic according to any one of.
[22] The content of the component (B) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, still more preferably 0.8% by mass or more, and more preferably 0.8% by mass or more, based on the total amount of cosmetics. The oil-in-water emulsified cosmetic according to any one of [1] to [21], preferably 4% by mass or less, more preferably 3.5% by mass or less, still more preferably 2.5% by mass or less.
[23] The content of the component (B) is preferably 0.1 to 4% by mass, more preferably 0.5 to 4% by mass, and further preferably 0.8 to 3. The oil-in-water emulsified cosmetic according to any one of [1] to [22], which is 5% by mass, more preferably 0.8 to 2.5% by mass.
[24] Any of [1] to [23], wherein the component (C) contains one or more metal oxide powders preferably selected from zinc oxide, titanium oxide and cerium oxide. Underwater oil type emulsified cosmetics described in.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Examples 1 to 14, Comparative Examples 1 to 4
An oil-in-water emulsified cosmetic was prepared by a conventional method according to the formulation shown in Table 1. Using these, (1) UV protection ability, (2) water resistance, (3) stability over time, (4) usability, and (5) abrasion resistance shown below were evaluated. The results are shown in Table 1.

(1) UV protection ability The UV protection ability was evaluated by the following in vitro SPF measurement.
Each sample of the oil-in-water emulsified cosmetic shown in Table 1 was uniformly applied on a quartz glass plate at 2 mg / cm ² for 1 minute, and dried in a cool and dark place for 15 minutes. After drying, with an SPF analyzer (SPF 290S plus, manufactured by Optitricus USA), a total of 9 absorption spectra (wavelength 350 nm) at the midpoint on a square quartz glass plate, each vertex, and the midpoint of the side connecting the vertices. ) Was measured, and the average of 9 points was calculated. The result showed the SPF value (-) obtained from the transmittance (%). (N = 3)
UV protection was evaluated according to the following criteria.

〔Evaluation criteria〕
A: SPF value is higher than 50 B: SPF value is 40 or more and 50 or less C: SPF value is 20 or more and 40 or less D: SPF value is lower than 20

(2) Water-resistant Each sample of the oil-in-water emulsified cosmetic shown in Table 1 was uniformly applied onto a quartz glass plate at a rate of 2 mg / cm ² , and allowed to air dry for 15 minutes. Then, the quartz glass plate coated with the sample was irradiated with ultraviolet rays from a certain distance (10 mm). The transmitted ultraviolet rays at that time were detected by an SPF analyzer (SPF 290S plus, manufactured by Optitricus USA) at 6 or more points on a quartz glass plate in the range of 290 to 400 nm, and an averaged spectrum was obtained to calculate the SPF value. ..
Then, the quartz glass plate coated with the sample was immersed in a water bath at 20 ° C. so that the coated surface was on top, and the water was lightly stirred for 15 minutes while keeping the water temperature at 20 ° C. Then, the quartz glass plate was slowly taken out and left for 30 minutes or more to dry. After repeating this work twice, the SPF value was obtained again by the same method, and the SPF value residual rate before and after the flood treatment was calculated.

[Water resistance evaluation]
The water resistance was determined according to the following criteria from the SPF value residual rate before and after the flood treatment.
SPF value residual rate (%) = (SPF value measured after immersing the sample-coated quartz glass plate in the water bath) / (SPF value measured before immersing the sample-coated quartz glass plate in the water bath) × 100
〔Evaluation criteria〕
A: SPF value residual rate is 90% or more B: SPF value residual rate is 70% or more and less than 90% C: SPF value residual rate is 50% or more and less than 70% D: SPF value residual rate is less than 50%

(3) Stability over time The oil-in-water emulsified cosmetics shown in Table 1 were stored at 60 ° C. for 1 month, and then the appearance was visually evaluated.
[Criteria for determining viscosity change]
A: No change or slight change in viscosity B: Clear change in viscosity C: Separated

(4) Usability We asked five specialized panelists to use the oil-in-water emulsified cosmetics shown in Table 1. Apply 0.02 mL of each cosmetic to a circle with a diameter of 3 cm on the inside of the forearm at 25 ° C and 57 RH%, and apply it for 1 minute. The "no stickiness afterwards" was evaluated in increments of 0.1, with 5 being the preferred case and 1 being the unfavorable case, and the average score of 5 persons was obtained. Evaluation and judgment were performed based on the following evaluation criteria and judgment criteria. 〔Evaluation criteria〕
5: Preferred 4: Somewhat preferred 3: Neither can be said 2: Somewhat unfavorable 1: Not preferred [Criteria]
A: Average score is 4.5 or more B: Average score is 3.0 or more and less than 4.5 C: Average score is 1.5 or more and less than 3.0 D: Average score is less than 1.5

(5) Friction resistance A sample of the oil-in-water emulsified cosmetic shown in Table 1 was applied to a quartz glass plate and dried by the same procedure as in the above method (1) UV protection ability evaluation method. Then, the friction was applied by a friction tester (Tripomaster, manufactured by Trinity Lab) (weight 20 g, 10 round trips). For the quartz glass plate after the friction load, the SPF value was obtained again by the same method, and the SPF value residual ratio before and after the friction load was calculated.
[Abrasion resistance evaluation]
From each SPF value before and after the frictional load, it was determined according to the following criteria.
Abrasion resistance evaluation (%) = (SPF value measured after rubbing the sample-coated quartz glass plate) / (SPF value measured before rubbing the sample-coated quartz glass plate) × 100
〔Evaluation criteria〕
A: 70% or more B: 50% or more and less than 70% C: 30% or more and less than 50% D: less than 30%

Details of the components used in Table 1 are shown below.
* 1: Pulsol 1789: 4-tert-butyl-4'-methoxydibenzoylmethane (manufactured by DSM)
* 2: Ubinal MC80: 2-ethylhexyl paramethoxycinnamate (manufactured by BASF)
* 3: Ubinal Plus: 2- (4-diethylamino-2-hydroxybenzoyl) benzoic acid hexyl ester (manufactured by BASF)
* 4: Ubinal T-150: 2,4,6-tris [4- (2-ethylhexyloxycarbonyl) anilino] -1,3,5-triazine (manufactured by BASF)
* 5: TINOSORB S: 2,4-bis {[4- (2-ethylhexyloxy) -2-hydroxy] phenyl} -6- (4-methoxyphenyl) -1,3,5-triazine (manufactured by BASF)
* 6: Sepigel 501: Polyacrylamide, polysorbate 85, mineral oil, isoparaffin; contains 20% by mass of polyacrylamide (manufactured by SEPPIC)
* 7: Simulgel EG: Sodium acrylate / sodium acryloyldimethyltaurate copolymer (manufactured by SEPPIC)
* 8: Aristflex AVC: (Acryloyldimethyltaurine ammonium / vinylpyrrolidone) copolymer (manufactured by Clariant)
* 9: Avalure flex-6: (PEG-240 / decyltetradeceth-20 / HDI) copolymer, trideceth-6 (manufactured by Lubrizol)
* 10: Pemulen TR-1: Acrylic acid / alkyl methacrylate copolymer (Rubyzol Advanced Materials)

The following hydrophobized fine particle metal oxide powders used in this example, comparative example and formulation example were used.

(Production Example 1 Production of Methylhydrogenpolysiloxane Surface-treated Fine Particle Titanium Oxide Powder)
Prepare a slurry consisting of 95 parts by mass of fine particle titanium oxide powder (substantially spherical, average particle diameter 0.017 μm), 5 parts by mass of methylhydrogenpolysiloxane (KF-99P, manufactured by Shinetsu Chemical Industry Co., Ltd.) and isopropyl alcohol, and stir well. After pulverization, the solvent was heated and distilled off under reduced pressure and heat-treated in air at 160 ° C. for 4 hours to obtain a methylhydrogenpolysiloxane surface-treated fine particle titanium oxide powder.

(Production Example 2 Production of octyltriethoxysilane surface-treated fine particle zinc oxide powder)
A slurry consisting of 93 parts by mass of fine particle zinc oxide powder (substantially spherical, average particle diameter 0.02 μm), 7 parts by mass of octyltriethoxysilane, and toluene was prepared and pulverized using a bead mill (Dynomill manufactured by Symmal Enterprises).・ Crushed. Next, toluene was heated and distilled off under reduced pressure, and then heat-treated at 150 ° C. for 4 hours using a blower airflow type dryer to obtain octyltriethoxysilane surface-treated fine particle zinc oxide powder.

(Production Example 3 Production of Methylhydrogenpolysiloxane Surface-treated Fine Particle Zinc Oxide Powder)
Prepare a slurry consisting of 93 parts by mass of fine particle zinc oxide powder (substantially spherical, average particle diameter 0.02 μm), 7 parts by mass of methylhydrogenpolysiloxane (KF-99P, manufactured by Shin-Etsu Chemical Industry Co., Ltd.) and isopropyl alcohol, and stir well. After pulverization, the solvent was heated and distilled off under reduced pressure and heat-treated at 150 ° C. in air for 4 hours to obtain a methylhydrogenpolysiloxane surface-treated fine particle zinc oxide powder.

From the results in Table 1, the oil-in-water emulsified cosmetic according to the embodiment of the present invention is superior in UV protection ability, water resistance, stability over time, and usability as compared with the oil-in-water emulsified cosmetic in Comparative Example. Furthermore, it is clear that it is also excellent in abrasion resistance.

The following is an example of prescribing the oil-in-water emulsified cosmetic of the present invention.
Example 15 (sunscreen)
When an oil-in-water emulsified cosmetic (sunscreen) having the following composition was prepared and evaluated, it was excellent in all of the ultraviolet protection effect, water resistance, usability, stability over time, and abrasion resistance.
(Compounding ingredients) (% by mass)
1. 1. Isononyl isononanoate 1.5
2. 2. Triethylhexanoin 2.0
3. 3. Isopropyl palmitate 2.0 2.0
4. Dimethicone (6cs) 2.0
5. Ubinal MC80 7.0
6. (Na acrylate / acryloyl dimethyl taurine) copolymer (SIMULGEL EG, manufactured by SEPPIC) 2.2
7. Octyltriethoxysilane Surface-treated fine particle zinc oxide powder (Production Example 2)
12
8. Ubinal T150 1.5
9. Tinosorb S 2.0
10. Ubinal Aplus 0.5
11. Xanthan gum 0.1
12.1,3-butylene glycol 2.0
13. Ethanol 10.0
14. Glycerin 2.0
15. Disodium edetate 0.01
16. Fragrance 0.05
17. Purified water balance

Example 16 (makeup base)
When an oil-in-water emulsified cosmetic (cosmetic base) having the following composition was prepared and evaluated, it was excellent in all of the ultraviolet protection effect, water resistance, usability, stability over time, and abrasion resistance.
(Compounding ingredients) (% by mass)
1. 1. Isononyl isononanoate 1.5
2. 2. Triethylhexanoin 2.0
3. 3. Isopropyl palmitate 1.0
4. Dimethicone (6cs) 1.0
5. Ubinal MC80 7.0
6. (Na acrylate / acryloyl dimethyl taurine) copolymer (SIMULGEL EG, manufactured by SEPPIC) 2.2
7. Methylhydrogenpolysiloxane Surface Treatment Fine Particle Titanium Oxide Powder (Production Example 1)
5.0
8. Octyltriethoxysilane Surface Treatment Pigment Titanium Oxide Powder 8.0
9. Ubinal T150 1.5
10. Tinosorb S 1.5
11. Ubinal Plus 1.0
12. Phospholipid 1.0
13. Behenyl alcohol 1.0
14. Xanthan gum 0.1
15.1,3-butylene glycol 2.0
16. Ethanol 7.0
17. Glycerin 2.0
18. Disodium edetate 0.01
19. Fragrance 0.05
20. Purified water balance

Claims (6)

An oil-in-water emulsified cosmetic containing the following components (A) to (C).
(A) Liquid oil containing an oil-soluble organic ultraviolet absorber (B) Salt-resistant water-soluble polymer (C) Hydrophobization-treated fine particle metal oxide powder (A) 40 components having an IOB value of 0.10 or more among the components It contains 3% by mass or more and 30% by mass or less of the component (A) in the total amount of cosmetics, and the content mass ratio (C / A) of the component (C) to the component (A) is 0.71 or more. 1.0 or less ,
An oil-in-water emulsified cosmetic in which the component (B) is a sodium acrylate / sodium acryloyldimethyltaurate copolymer . The oil-in-water emulsified cosmetic according to claim 1, wherein the component (A) contains 40% by mass or more of a component having an IOB value of 0.10 or more and 0.60 or less. As the oil-soluble organic ultraviolet absorber contained in the component (A), 2- (4-diethylamino-2-hydroxybenzoyl) benzoic acid hexyl ester, 2,4-bis {[4- (2-ethylhexyloxy) -2-Hydroxy] phenyl} -6- (4-methoxyphenyl) -1,3,5-triazine, 2,4,6-tris [4- (2-ethylhexyloxycarbonyl) anilino] -1,3,5 One or more organic UV absorbers selected from the group consisting of -triazine, 4-tert-butyl-4'-methoxydibenzoylmethane, and 2-ethylhexyl dimethoxybenzylidene dioxoimidazolidine propionate at 25 ° C. The oil-in-water emulsified cosmetic according to claim 1 or 2 , which comprises. The oil-in-water emulsified cosmetic according to claim 3 , wherein the content of the solid organic ultraviolet absorber with respect to the component (A) is 10% by mass or more and 35% by mass or less. Claim 1 is a surface treatment of one or more selected from the group consisting of a surface treatment using a methylhydrogenpolysiloxane and a surface treatment using a silane compound or a silazane compound. The oil-in-water emulsified cosmetic according to any one of 4 to 4 . The oil-in-water emulsified cosmetic according to any one of claims 1 to 5 used for sunscreen applications.