CN115397520A - Oil-in-water type emulsion cosmetic - Google Patents

Abstract

The oil-in-water emulsified cosmetic of the present invention contains the following component (A1), component (A2), component (B) and component (C): component (A1): a water-insoluble organic ultraviolet ray that is solid at 25°C Absorbent, component (A2): liquid oil, component (B): acrylamide polymer, component (C): fine particle metal oxide after hydrophobization treatment, the content of component (C) is relative to that of component (A1 ) to the total content of the component (A2) [(C)/(A1+A2)] is not less than 0.25 and not more than 1.8, and as the component (A2), 2-ethylhexyl p-methoxycinnamate and azulene The total content of crillin is 2% by mass or less in the total amount of oil-in-water emulsified cosmetics.

Description

Oil-in-water emulsified cosmetics

technical field

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

Background technique

In recent years, the importance of protecting against ultraviolet rays in daily life is increasing, and the demand for sunscreen cosmetics is also expanding. Based on this market demand, oil-in-water emulsified sunscreen cosmetics have been developed that can easily provide a refreshing feeling even after continuous use.

In these oil-in-water emulsified cosmetics, ultraviolet absorbers or ultraviolet scatterers are used to enhance the ultraviolet protection effect. Especially 2-ethylhexyl p-methoxycinnamate and octocrylene (2-cyano-3,3-diphenyl-2-acrylate 2-ethylhexyl) used as UV absorbers , because it has a maximum absorption wavelength in the UVB region and has a high affinity with oils, so it is used in most sunscreen cosmetics.

However, these ultraviolet absorbers may irritate the skin of users with sensitive skin, so sunscreen cosmetics with reduced content of these ultraviolet absorbers have been proposed.

For example, the purpose of Japanese Patent Application Laid-Open No. 2017-078054 (Patent Document 1) is to provide a solution that can suppress the compounding amount of ethylhexyl methoxycinnamate and octocrylene (octocrylene) as a liquid ultraviolet absorber. Sunscreen cosmetics that exert a high UV protection effect and are excellent in stable usability are recorded: Sunscreen cosmetics that contain a specific solid UV absorber, a specific ester oil, and a UV scattering agent with a refractive index within a specific range in a specific compounding amount, The total blending amount of ethylhexyl methoxycinnamate and octocrylene in the described sunscreen cosmetics is 3% by mass or less.

Contents of the invention

The oil-in-water emulsified cosmetic according to the present invention contains the following component (A1), component (A2), component (B) and component (C):

Component (A1): a water-insoluble organic ultraviolet absorber that is solid at 25°C,

Ingredient (A2): Liquid oil agent,

Component (B): acrylamide polymer,

Ingredient (C): Hydrophobized fine particle metal oxide,

The mass ratio [(C)/(A1+A2)] of the content of the component (C) to the total content of the component (A1) and the component (A2) is 0.25 or more and 1.8 or less;

As the component (A2), the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is 2% by mass or less in the total amount of the oil-in-water emulsified cosmetic.

Detailed ways

It is known that the sunscreen cosmetics described in Patent Document 1 have insufficient UV protection effect and emulsification stability, and are sticky when applied to the skin, and the make-up adhesion is poor when applying base makeup or foundation on it, and In case of oily shine due to sebum.

The present invention relates to an excellent UV protection effect even when the content of 2-ethylhexyl p-methoxycinnamate and octocrylene is low, excellent emulsification stability, less stickiness when applied, and makeup adhesion Good oil-in-water emulsified cosmetics that suppress shine due to sebum.

The inventors of the present invention have found that an oil-in-water emulsified cosmetic containing a water-insoluble organic ultraviolet absorber that is solid at 25°C, a liquid oil, an acrylamide-based polymer, and a hydrophobized particulate metal oxide, p-methoxycinnamic acid used as the liquid oil when the mass ratio of the particulate metal oxide content to the total content of the water-insoluble organic ultraviolet absorber and the liquid oil is within a specific range When the total content of 2-ethylhexyl ester and octocrylene is below a certain value in the total amount of the oil-in-water emulsified cosmetic, high emulsification stability, excellent ultraviolet protection ability, less stickiness when applied, and An oil-in-water emulsified cosmetic that adheres well and suppresses shine due to sebum.

That is, the oil-in-water emulsion cosmetic according to the present invention is an oil-in-water emulsion cosmetic containing the following component (A1), component (A2), component (B) and component (C):

Component (A1): a water-insoluble organic ultraviolet absorber that is solid at 25°C,

Ingredient (A2): Liquid oil agent,

Component (B): acrylamide polymer,

Ingredient (C): Hydrophobized fine particle metal oxide,

The mass ratio [(C)/(A1+A2)] of the content of the component (C) to the total content of the component (A1) and the component (A2) is 0.25 or more and 1.8 or less,

As the component (A2), the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is 2% by mass or less in the total amount of the oil-in-water emulsified cosmetic.

The present invention can provide: Even if the content of 2-ethylhexyl p-methoxycinnamate and octocrylene is reduced, an excellent UV protection effect can be obtained, and excellent emulsification stability, less sticky when applied, and a makeup sticker Oil-in-water emulsified cosmetics with good adhesion and suppressed shine due to sebum.

[Oil-in-water emulsified cosmetics]

The oil-in-water emulsified cosmetic (hereinafter also referred to as "emulsified cosmetic") of the present invention is an oil-in-water emulsified cosmetic containing the following component (A1), component (A2), component (B) and component (C):

Component (A1): a water-insoluble organic ultraviolet absorber that is solid at 25°C,

Ingredient (A2): Liquid oil agent,

Component (B): acrylamide polymer,

Ingredient (C): Hydrophobized fine particle metal oxide,

The mass ratio [(C)/(A1+A2)] of the content of the component (C) to the total content of the component (A1) and the component (A2) is 0.25 or more and 1.8 or less,

As the component (A2), the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is 2% by mass or less in the total amount of the oil-in-water emulsified cosmetic.

In addition, in the present invention, the so-called "containing component (A1), component (A2), component (B) and component (C)" means "combining component (A1), component (A2), component (B) and component ( C) made".

In the present invention, the so-called "liquid state" refers to a state with fluidity under 1 atmospheric pressure and an environment of 25° C., that is, a state at a temperature above the melting point (in an amorphous substance without a melting point, the melting point state under the above temperature conditions). Also, the so-called "solid state" refers to a state that does not have fluidity at 1 atmospheric pressure and an environment of 25° C., that is, a state that is present at a temperature lower than the melting point (in an amorphous substance without a melting point, it is present at a temperature lower than the melting point. state under temperature conditions).

In the present invention, "water-insoluble" means that the solubility to water is 1 w/w% or less.

The oil-in-water emulsified cosmetic of the present invention has an excellent ultraviolet protection effect even if the content of 2-ethylhexyl methoxycinnamate and octocrylene is low, and has excellent emulsification stability, and no stickiness when applied. Less greasy, make-up adheres well, and the shine caused by sebum is suppressed. Although the reason is not clear, it can be considered as follows.

In the present invention, the surface of the particulate metal oxide is hydrophobized, and an acrylamide polymer is used as a tackifier to increase the viscosity of the water phase as the continuous phase. When the particulate metal oxide is suitable for oil-in-water emulsification In the case of cosmetics, it is judged that particulate metal oxides can be stably present in the oil phase. In addition, by setting the mass ratio of the content of the hydrophobized fine-particle metal oxide to the total content of the solid water-insoluble organic ultraviolet absorber and the liquid oil as the oil that becomes the oil phase, as a predetermined range, it can improve the emulsification stability, and can effectively scatter or absorb ultraviolet rays. Therefore, it is judged that even if the content of 2-ethylhexyl methoxycinnamate and octocrylene is low, the ultraviolet defense ability can still be improved, and Prevents stickiness when applied. In addition, when the oil-in-water emulsified cosmetic of the present invention is applied to the skin, it is judged that by forming a coating film containing the above-mentioned oil agent and the hydrophobized fine particle metal oxide, the makeup can be adhered well, and it is possible to suppress the damage caused by sebum. The resulting shine.

Here, 2-ethylhexyl p-methoxycinnamate and octocrylene, which are used as liquid oils, are ingredients that cause stickiness when applied, and the oily skin is judged to be due to these ingredients, and A phenomenon in which high-refractive-index oils contained in sebum secreted from the skin are compatible. In the present invention, since the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is below a specific value in the total amount of oil-in-water emulsified cosmetics, it is judged that the stickiness, As well as improving the effect of suppressing shine caused by sebum.

<Component (A1): Water-insoluble organic UV absorber that is solid at 25°C>

The oil-in-water emulsified cosmetic of the present invention contains, as a component (A1), a water-insoluble organic ultraviolet absorber that is solid at 25° C. from the viewpoint of enhancing the ultraviolet shielding effect.

Component (A1) includes, for example: 4-tert-butyl-4'-methoxydibenzoylmethane, 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2 ,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, cresyltrizole tri Siloxane, 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-tri Oxyzine, 2-ethylhexyl dimethoxybenzylidene dioxoimidazoline propionate, etc. These water-insoluble organic ultraviolet absorbers may be contained individually by 1 type, or may contain 2 or more types together.

Among these, component (A1) is preferably selected from 4-tert-butyl-4'-methoxydibenzoylmethane, 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2 ,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, cresyltrizole tri Siloxane, and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5- At least one selected from triazines, more preferably 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2,4,6-tris[4-(2-ethylhexyl) Oxycarbonyl)anilino]-1,3,5-triazine, and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methyl 1 or more selected from oxyphenyl)-1,3,5-triazine.

In addition, in the oil-in-water emulsion cosmetic of the present invention, it is preferable that the component (A1) exists in a state dissolved in the component (A2).

Commercially available components (A1) include, for example, "PARSOL 1789" (4-tert-butyl-4'-methoxydibenzoylmethane) (manufactured by DSM); "UVINUL A PLUS" (2 -(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate), "UVINUL T-150" (2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino] -1,3,5-triazine), "UVINULM40" (2-hydroxy-4-methoxybenzophenone), "TINOSORB S" (2,4-bis{[4-(2-ethylhexyl oxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine) (both are manufactured by BASF); "Mosacare A440" (cresol koji azole trisiloxane) (manufactured by UFC CORPORATION); "SOFT SHADE DH" (2-ethylhexyl dimethoxybenzylidene dioxoimidazoline propionate) (manufactured by Ajinomoto Co., Ltd.); and the like.

The content of the component (A1) in the total amount of the oil-in-water emulsified cosmetic of the present invention is preferably 0.5% by mass or more, more preferably 0.7% by mass or more, and still more preferably 1% by mass, from the viewpoint of enhancing the UV protection effect. % or more, more preferably 2% by mass or more; and, from the viewpoint of suppressing stickiness during application and preventing shine caused by sebum, preferably 10% by mass or less, more preferably 8% by mass or less, even more preferably It is 6 mass % or less, More preferably, it is 5 mass % or less. More specifically, it is preferably 0.5 to 10% by mass, more preferably 0.7 to 8% by mass, still more preferably 1 to 6% by mass, and still more preferably 2 to 5% by mass.

<Ingredient (A2): Liquid oil>

The oil-in-water emulsified cosmetic of the present invention contains a liquid oil agent as the component (A2) from the viewpoint of dissolving the component (A1), introducing the component (C), and improving emulsion stability.

Component (A2) is an oil agent having fluidity under 1 atmosphere pressure and 25° C. environment as described above.

The oil-in-water emulsified cosmetic of the present invention may contain a liquid organic ultraviolet absorber as the component (A2) from the viewpoint of further enhancing the ultraviolet protection effect.

Examples of the liquid organic ultraviolet absorber of component (A2) include: 2-ethylhexyl p-methoxycinnamate, 2-ethoxyethyl p-methoxycinnamate, p-methoxycinnamate Cinnamic acid UV absorbers such as mixture of isopropyl ester and diisopropyl cinnamate, methyl bis(trimethylsiloxy)silyl isopentyl trimethoxycinnamate, etc.; amyl p-(dimethylamino)benzoate p-aminobenzoic acid UV absorbers such as esters, 2-ethylhexyl p-(dimethylamino)benzoate, etc.; ethylene glycol salicylate, 2-ethylhexyl salicylate, butyl salicylate Salicylic acid UV absorbers such as octyl ester, benzyl salicylate, and trimethylcyclohexyl salicylate; octocrylene; polydimethylsiloxane benzylidene malonate; Copolymers of adipic acid and neopentyl glycol are capped with octyldodecanol or cyanodiphenylacrylic acid, etc. These liquid organic ultraviolet absorbers may be contained individually by 1 type, or may contain 2 or more types in combination suitably.

Commercially available liquid organic ultraviolet absorbers include, for example, "UVINUL MC80" (2-ethylhexyl p-methoxycinnamate) (manufactured by BASF Corporation); "PARSOL 340" (octocrylene) (manufactured by DSM Nutrition Japan Co., Ltd.); "PARSOL EHS" (2-ethylhexyl salicylate), "PARSOL HMS" (trimethylcyclohexyl salicylate), "PARSOLSLX" (polysiloxane-15 ( INCI name: Polysilicone-15) (polydimethylsiloxane benzylidene malonate diethyl ester)) (all above are manufactured by DSM); "Polycrylene" (polyester-8 (INCI name: Polyester-8 ) (copolymer of adipic acid and neopentyl glycol terminated with octyldodecanol or cyanodiphenylacrylic acid) (manufactured by Hallstar).

Among them, as the component (A2), the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene, from the point of view of suppressing stickiness when applying and suppressing shine caused by sebum, is in the oil-in-water 2% by mass or less, preferably 1.5% by mass or less, more preferably 1% by mass or less, still more preferably 0.7% by mass or less, still more preferably 0.5% by mass or less, still more preferably 0.3% by mass in the total amount of emulsified cosmetics % or less, more preferably 0% by mass, that is, 2-ethylhexyl p-methoxycinnamate and octocrylene are not contained.

Component (A2) preferably contains other liquid oil agents other than the above-mentioned liquid organic ultraviolet absorbers from the viewpoint of dissolving component (A1), introducing component (C), and improving emulsion stability. The other liquid oils are not particularly limited as long as they are liquid in an environment of 1 atmosphere and 25° C., and examples thereof include oils commonly used in cosmetics.

As other liquid oil agents, for example, one or more kinds selected from ester oils, silicone oils, hydrocarbon oils, higher alcohols, and higher fatty acids are preferable. The above-mentioned liquid oil agents may be contained individually by 1 type, or may contain 2 or more types in combination suitably.

Examples of ester oils include synthetic ester oils and natural oils, such as esters of monocarboxylic acids and monohydric alcohols, esters of monocarboxylic acids and polyhydric alcohols, and esters of polyvalent carboxylic acids and monohydric alcohols.

As the ester of monocarboxylic acid and monohydric alcohol, for example, the ester shown in the following general formula (1):

R ¹ -COO-R ² (1)

In the general formula (1), R ¹ represents a linear or branched alkyl or alkenyl group having 1 to 25 carbon atoms, or an aromatic-containing group having 6 to 24 carbon atoms, which may also be substituted by a hydroxyl group. Hydrocarbyl; R ² represents a linear or branched alkyl or alkenyl group with 1 to 30 carbon atoms.

When R ¹ is an alkyl or alkenyl group, the number of carbon atoms in R ¹ is preferably 7 or more, preferably 23 or less, more preferably 21 or less, still more preferably 19 or less, still more preferably 17 or less.

When R ¹ is an aromatic hydrocarbon group, the number of carbon atoms in R ¹ is preferably 6 or more, and preferably 22 or less, more preferably 20 or less.

The number of carbon atoms of R ² is preferably 2 or more, and preferably 28 or less, more preferably 24 or less, further preferably 22 or less, still more preferably 20 or less.

Specific examples of esters represented by the general formula (1) include cetyl isooctanoate (cetyl 2-ethylhexanoate), stearyl isooctanoate, isononyl isononanoate, isononanoate Isotridecyl, Hexyl Laurate, Isostearyl Laurate, Butyl Myristate, Isopropyl Myristate, Decyl Myristate, Isotridecyl Myristate, Isostearyl Myristate Cetyl Ester, Isostearyl Myristate, 2-Octyldodecyl Myristate, Isopropyl Palmitate, 2-Ethylhexyl Palmitate, Isostearyl Palmitate, 2-Palmitate Hexyldecyl, 2-Ethylhexyl Stearate, 2-Hexyldecyl Stearate, Isopropyl Isostearate, 2-Hexyldecyl Isostearate, Ethyl Oleate, Isodecyl Oleate esters, oleyl oleate, 2-octyldodecyl oleate, ethyl linoleate, isopropyl linoleate, lanolin acetate, castor oil fatty acid methyl ester (methyl castorate), and One or more selected from alkyl benzoates (alkyl having 12 to 15 carbon atoms).

As the ester of monocarboxylic acid and monohydric alcohol, esters such as those shown in the following general formula (2) can also be cited:

R ³ -COO-(AO) _n -R ⁴ (2)

In the general formula (2), R ³ represents a linear or branched alkyl or alkenyl group with a carbon number of 1 or more and 25 or less that may also be substituted by a hydroxyl group; R ⁴ represents a carbon number of 6 or more and 24 or less containing Aromatic hydrocarbon group. AO represents an alkylene oxide group having 2 to 4 carbon atoms; n represents an average added mole number of 1 to 50.

R ³ is preferably an alkyl group having 7 or more carbon atoms, preferably 23 or less, more preferably 21 or less, further preferably 19 or less.

R ⁴ is preferably an aromatic hydrocarbon group having 6 or more carbon atoms, preferably 22 or less, more preferably 20 or less, further preferably 18 or less, and more preferably benzyl.

The alkylene oxide group represented by AO is preferably an acryloxy group, and n is preferably 1 to 10, more preferably 1 to 5.

Specific examples of esters represented by the general formula (2) include esters of propylene oxide 3-mole adducts of myristic acid and benzyl alcohol (manufactured by CRODA: CRODAMOL STS), 2-ethylhexanoic acid Esters of propylene oxide 3-mole adducts with benzyl alcohol (manufactured by CRODA: CRODAMOL SFX), etc.

As the ester of monocarboxylic acid and polyhydric alcohol, the ester shown in the following general formula (3) can be enumerated:

R ⁵ -(OCOR ⁶ ) _p (3)

In the general formula (3), ^R5 represents a polyhydric alcohol residue, preferably a hydrocarbon group with 2 to 10 carbon atoms; ^R6 represents a monocarboxylic acid residue with 1 to 25 carbon atoms; p represents 2 or more and an integer below 10.

In addition, R ⁵ may have an ether bond, and is preferably a linear or branched hydrocarbon group having 2 to 10 carbon atoms. Moreover, p is preferably the same numerical value as the hydroxyl group that the above-mentioned polyhydric alcohol has.

The number of carbon atoms in ^R6 is preferably 5 or more, more preferably 7 or more, and from the same viewpoint as above, preferably 23 or less, more preferably 21 or less, still more preferably 19 or less, still more preferably 17 The following alkyl groups.

As the ester represented by the general formula (3), for example: propylene glycol dicaprate, propylene glycol dioleate, neopentyl glycol dicaprate, neopentyl glycol di-2-ethylhexanoate, Propylene Glycol (Caprylic/Capric Acid), Propylene Glycol Diisostearate, Ethylene Glycol Di-2-Ethylhexanoate, Glyceryl Tri(Caprylic/Capric Acid), Glyceryl Tris-2-Ethylhexanoate, Glyceryl 2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, natural oil.

Examples of natural fats and oils include triglycerides such as avocado oil, olive oil, flax oil, rice bran oil, castor oil, soybean oil, corn oil, rapeseed oil, castor oil, cottonseed oil, and mink oil.

As the ester of polycarboxylic acid and monohydric alcohol, the ester shown in the following general formula (4) can also be exemplified:

R ⁷ -(COOR ⁸ ) _q (4)

In the general formula (4), R ⁷ represents a polycarboxylic acid residue with a carbon number of 2 or more and 10 or less; R ⁸ represents a monohydric alcohol residue with a carbon number of 1 or more and 25 or less; q is 2 or more and 10 or less integer. Moreover, it is preferable that q is the same numerical value as the carboxyl group which the said polyhydric carboxylic acid has.

The number of carbon atoms in R ⁸ is preferably 3 or more, and from the same viewpoint as above, it is preferably 23 or less, more preferably 21 or less, and still more preferably 19 or less.

Specific examples include: diisostearyl malate, di-2-ethylhexyl succinate, diisobutyl adipate, di-2-heptylundecyl adipate, di-2-sebacate Ethylhexyl, diisopropyl sebacate, tri-2-ethylhexyl trimellitate, etc.

Among these, the above-mentioned ester oil is preferably one represented by the general formula (1), the general formula (3) or the general formula (4) from the viewpoint of dissolving the component (A1), introducing the component (C), and making the emulsification stability good. The ester shown is more preferably a monoester of a straight-chain or branched chain fatty acid with a carbon number of 8 to 18 and a straight-chain or branched monohydric alcohol with a carbon number of 2 to 24, and a monoester with a carbon number of 6 to 24. Triesters of branched-chain fatty acids with 18 or less carbon atoms and glycerol, tetraesters of branched-chain fatty acids with 6 or more and 18 or less carbon atoms and pentaerythritol, branched-chain fatty acids with 6 or more and 18 or less carbon atoms and branched-chain fatty acids with 2 or more and 10 or less carbon atoms The following diesters of branched dihydric alcohols, triesters of branched monohydric alcohols with 6 to 18 carbon atoms and trimellitic acid, and alkyl (C12-15) benzoates (such as "Finsolv TN" (manufactured by Innospec Active Chemicals LLC)), more preferably cetyl 2-ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, 2-myristic acid Octyldodecyl, Isopropyl Palmitate, Glyceryl Tris-2-Ethylhexanoate, Pentaerythritol Tetra-2-Ethylhexanoate, Diisopropyl Sebacate, Tris-2-Ethyl Trimellitate One or more selected from hexyl esters and alkyl (C12-15) benzoates.

From the viewpoint of dissolving the component (A1), introducing the component (C), and improving the stability of the emulsion, the silicone oil is preferably dimethyl polysiloxane, and more preferably has a kinematic viscosity at 25°C of 5,000 mm ² /s or less. of dimethylpolysiloxane.

The 25° C. kinematic viscosity of the silicone oil can be measured with an Ubbelohde viscometer in accordance with ASTM D 445-46T or JIS Z 8803.

Examples of commercially available silicone oils include "KF-96A-6cs" (dimethylpolysiloxane) and "KF-96A-10cs" (dimethylpolysiloxane) manufactured by Shin-Etsu Chemical Co., Ltd. ), "KF-96A-20cs" (dimethylpolysiloxane), "KF-96A-100cs" (dimethylpolysiloxane), etc.

Specific examples of the aforementioned hydrocarbon oils include liquid paraffin, hydrogenated polyisobutene (liquid isoparaffin, heavy liquid isoparaffin), naphthene, liquid ozokerite, squalene, squalane, isostearyl alkanes, α-olefin oligomers, polybutene, isohexadecane, etc.

Examples of the higher alcohol include branched or unsaturated higher alcohols having 12 to 24 carbon atoms, such as 2-octyldodecanol, isostearyl alcohol, and oleyl alcohol. Among them, branched or unsaturated higher monohydric alcohols having 12 to 24 carbon atoms are preferable.

Examples of the higher fatty acid include fatty acids having 12 to 22 carbon atoms, such as oleic acid and isostearic acid.

Component (A2) preferably contains at least one selected from ester oil and silicone oil, and more preferably contains the formula (1), one or more selected from the ester represented by the general formula (3) or the general formula (4), and dimethyl polysiloxane, and it is more preferable to contain a straight compound having 8 or more and 18 or less carbon atoms. Monoesters of chain or branched fatty acids and linear or branched monohydric alcohols with 2 to 24 carbon atoms, triesters of branched fatty acids with 6 to 18 carbon atoms and glycerin, and triglycerides with 6 or more carbon atoms and Tetraesters of branched-chain fatty acids having 18 or less and pentaerythritol, diesters of branched-chain fatty acids having 6 or more and 18 or less carbon atoms and branched diols having 2 or more and 10 or less carbon atoms, diesters of branched-chain diols having 6 or more and 18 or less carbon atoms Selected from the following triesters of branched monohydric alcohols and trimellitic acid, alkyl (C12-15) benzoate, and dimethyl polysiloxanes with kinematic viscosity at 25°C of 5,000 mm ² /s or less One or more, more preferably cetyl 2-ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, 2-octyldodecyl myristate, palmitic acid Isopropyl Ester, Glyceryl Tris-2-Ethylhexanoate, Pentaerythritol Tetra-2-Ethylhexanoate, Diisopropyl Sebacate, Tris-2-Ethylhexyl Trimellitate, Alkyl Benzoate (C12 -15) One or more selected from esters and dimethyl polysiloxanes having a kinematic viscosity at 25°C of 5,000 mm ² /s or less.

The content of the component (A2) in the total amount of the oil-in-water emulsified cosmetic of the present invention is preferably 5% by mass or more, more preferably 7% by mass, from the viewpoint of introducing the component (C) and improving the stability of the emulsion. Above, more preferably 10% by mass or more, and from the viewpoint of suppressing stickiness during application, making makeup stick well, and suppressing shine due to sebum, preferably 30% by mass or less, more preferably 25% by mass % or less, more preferably 20 mass % or less, still more preferably 17 mass % or less. More specifically, it is preferably 5 to 30% by mass, more preferably 7 to 25% by mass, still more preferably 10 to 20% by mass, still more preferably 10 to 17% by mass.

When the component (A2) contains one or more liquid oils selected from ester oils and silicone oils as liquid organic ultraviolet absorbers, the total content of the ester oils and silicone oils in the component (A2) is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, still more preferably 90% by mass or more, still more preferably 95% by mass or more, and preferably 100% by mass or less.

In the total amount of oil-in-water emulsified cosmetics of the present invention, the mass ratio of the content of component (A2) relative to the content of component (A1) [(A2)/(A1)] (hereinafter also referred to as "content mass ratio [(A2) )/(A1)]"), from the viewpoint of dissolving the component (A1), introducing the component (C), and making the emulsification stability good, it is preferably 1 or more, more preferably 2 or more, still more preferably 3 or more, More preferably 4 or more, still more preferably 5 or more, and from the viewpoint of enhancing the UV protection effect, preferably 20 or less, more preferably 15 or less, still more preferably 10 or less, still more preferably 7 or less. More specifically, it is preferably 1-20, more preferably 2-15, still more preferably 3-10, still more preferably 4-10, still more preferably 4-7, still more preferably 5-7.

<Component (B): Acrylamide polymer>

The oil-in-water emulsified cosmetic of the present invention contains an acrylamide-based polymer as Ingredient (B).

From the same viewpoint as above, the component (B) preferably contains a structural unit derived from at least one selected from acrylamide and acryloyldimethyltaurine (hereinafter also referred to as "AMPS"): Acrylamide-based monomers; more preferably one or more selected from homopolymers of acrylamide, homopolymers of AMPS and salts thereof, and copolymers and salts thereof containing structural units derived from propylene One or more acrylamide-based monomers selected from amides and AMPS; more preferably one or more acrylamide-based monomers selected from homopolymers of acrylamide, and copolymers and salts thereof containing structural units derived from One or more acrylamide-based monomers selected from acrylamide and AMPS.

Specific examples of component (B) include polyacrylamide (homopolymer of acrylamide), (acrylamide/acrylic acid) copolymer, (AMPS/acrylic acid) copolymer, (AMPS/acrylamide) copolymer , (AMPS/acrylamide/acrylic acid) copolymer, (AMPS/dimethylacrylamide) copolymer, (AMPS/hydroxyethyl acrylate) copolymer, (AMPS/vinylpyrrolidone) copolymer, (AMPS/vinyl Formamide) copolymer, (AMPS/polyoxyethylene alkyl methacrylic acid ester (average number of ethylene oxide added moles: 10 to 30)) copolymer, and salts thereof.

More specific examples of the above-mentioned copolymers and their salts include (acryloyl dimethyl taurate Na/hydroxyethyl acrylate) copolymer (INCI name: Hydroxyethyl Acrylate/Sodium AcryloyldimethylTaurate Copolymer), (acryloyl dimethyl taurate Copolymer), (acryloyl dimethyl taurate Dimethyl taurine (Na/acrylic acid Na) copolymer (INCI name: SodiumAcrylate/Sodium Acryloyldimethyl Taurate Copolymer), acryloyl dimethyl taurine/acrylic acid Na/dimethylacrylamide) cross-linked polymer (INCI name : Sodium Acrylate/Acryloyldimethyltaurate/Dimethylacrylamide Crosspolymer), (Acryloyldimethyltaurate Ammonium/Vinylpyrrolidone) Copolymer (INCI Name: Ammonium Acryloyldimethylaurate/VPCopolymer), (Acryloyldimethyltaurate Na/Acrylic Acid/ Acrylamide/acrylic acid (Na) copolymer (INCI name: Polyacrylate-13), (acryloyldimethylammonium taurate/dimethylacrylamide/lauryl methacrylate/lauryl methacrylate-4) Cross-linked polymer (INCI name: Polyacrylate Crosspolymer-6), (acryloyl dimethyl ammonium taurate/beheneth-25) cross-linked polymer (INCI name: AmmoniumAcryloyldimethyltaurate/Beheneth-25Methacrylate Crosspolymer ), (ammonium acryloyldimethyltaurate/steareth-25 methacrylate) crosslinked polymer (INCI name: AmmoniumAcryloyldimethyltaurate/Steareth-25Methacrylate Crosspolymer), etc.

Examples of commercially available products containing component (B) include "SEPIGEL 501" (polyacrylamide, polysorbate 85, mineral oil, isoparaffin), "SEPIGEL 305" (polyacrylamide, hydrogenated polyisobutylene ( or (C13,14) isoparaffin), laureth-7, water), "SIMULGEL EG" ((Na acryloyldimethyltaurine/Na acrylate) copolymer, isohexadecane, polysorbate alcohol ester 80), "SEPIMAX ZEN" ((ammonium acryloyldimethyltaurate/dimethylacrylamide/lauryl methacrylate/laureth-4 methacrylate) crosspolymer), " SEPINOV EMT 10" (((acryloyl dimethyl taurate Na/hydroxyethyl acrylate) copolymer, sorbitan isostearate, polysorbate 60), "SIMULGEL NS" ((acryloyl di Na-methyl taurate/hydroxyethyl acrylate) copolymer, squalane, polysorbate 60, water), "SIMULGEL FL" ((Na-acryloyldimethyl taurate/hydroxyethyl acrylate) copolymer , Isohexadecane, Polysorbate 60, Water), "SEPIPLUS S" ((Na Acryloyldimethyltaurate/Hydroxyethyl Acrylate) Copolymer, Polyisobutylene, PEG-7 Trimethylol Propane coconut oil alkyl ether, water), "SEPIPLUS 400" ((acryloyldimethyltaurine Na/acrylic acid/acrylamide/acrylic acid Na) copolymer, polyisobutylene, polysorbate 20, water) (above Both are manufactured by SEPPIC); "Aristoflex AVC" ((acryloyldimethyltaurate ammonium/vinylpyrrolidone) copolymer, tert-butanol, water), "Aristoflex HMB" ((acryloyldimethyltaurate ammonium methacrylate/beheneth-25) crosspolymer, tert-butanol, water), "Aristoflex HMS" ((ammonium acryloyldimethyltaurate/steareth methacrylate -25) Cross-linked polymer) (all of the above are manufactured by Clariant).

Among these, component (B) is more preferably made from polyacrylamide, (acryloyldimethyltaurine Na/acrylic acid Na) copolymer, (acryloyldimethyltaurine Na/hydroxyethyl acrylate) copolymer , and (ammonium acryloyldimethyltaurate/vinylpyrrolidone) copolymers are selected from one or more types.

The content of the component (B) in the total amount of the oil-in-water emulsified cosmetics of the present invention is determined by increasing the viscosity of the water phase as the continuous phase, making the fine particle metal oxides stably exist in the oil phase, and improving the stability of the emulsification. From a viewpoint, it is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, still more preferably 0.5% by mass or more, and is preferably 3% by mass or less, more preferably 2% by mass or less, and still more preferably 1.5% by mass or less , and more preferably 1% by mass or less. More specifically, it is preferably 0.1 to 3% by mass, more preferably 0.3 to 2% by mass, still more preferably 0.3 to 1.5% by mass, still more preferably 0.5 to 1.5% by mass, still more preferably 0.5 to 1% by mass .

<Ingredient (C): Hydrophobized fine particle metal oxide>

The oil-in-water emulsified cosmetic of the present invention contains, as a component (C), a hydrophobized fine particle metal oxide from the viewpoint of absorbing or scattering ultraviolet rays and enhancing the effect of protecting against ultraviolet rays.

The particulate metal oxide of the component (C) is preferably at least one selected from particulate zinc oxide, particulate titanium oxide, and particulate cerium oxide, and more preferably It is one or more selected from fine particle zinc oxide and fine particle titanium oxide. In addition, these particulate metal oxides may contain metals having a divalent or higher valence, and the above particulate metal oxides may contain metals such as iron, zirconium, calcium, manganese, magnesium, and yttrium or oxides thereof alone or in an appropriate combination of two or more.

As the hydrophobization treatment of component (C), for example: silicone treatment; alkylalkoxysilane treatment; fatty acid treatment; - Amino acid treatment by acyl glutamic acid, etc.; lecithin treatment; metal soap treatment; alkyl phosphate treatment; use of N-acyl amino acid metal salt (sodium lauroyl aspartate), zinc chloride and alkoxyalkane ASI treatment of base titanium (isopropyl titanium triisostearate), etc.

These surface treatments may be used alone or in combination of two or more.

Among these, the hydrophobic treatment of component (C) is from the viewpoint of improving the dispersibility of component (C) in oil-in-water emulsified cosmetics, improving the ultraviolet protection effect and emulsification stability, and suppressing the friction feeling after application, making the From the viewpoint of good makeup adhesion, it is preferably one or more selected from silicone treatment, alkylalkoxysilane treatment, and fatty acid treatment.

As the surface treatment agent used for silicone treatment, for example: methylpolysiloxane, dimethylpolysiloxane (polydimethylsiloxane), methylphenylpolysiloxane, methylpolysiloxane, Dimethicone/Methylhydrogensiloxane Copolymer (Hydrodimethicone), Methylcyclopolysiloxane, Dodecamethylcyclohexasiloxane , tetramethylhexasiloxane, dimethylsiloxane/methyl(polyoxyethylene)siloxane/methyl(polyoxypropylene)siloxane copolymer, dimethylsiloxane/methyl (polyoxyethylene)siloxane copolymer, dimethylsiloxane/methyl(polyoxypropylene)siloxane copolymer, dimethylsiloxane/methylcetyloxysiloxane copolymer, Various silicone oils such as dimethylsiloxane/methylstearyloxysiloxane copolymer, (alkyl acrylate/polydimethylsiloxane) copolymer, etc. Among these, the surface treatment agent used in the silicone treatment is to improve the dispersibility of the component (C) in the oil-in-water emulsified cosmetics, improve the ultraviolet protection effect and the emulsion stability, and to suppress the staining after application. From the viewpoint of friction feeling and good makeup adhesion, dimethylpolysiloxane (polydimethylsiloxane), methylhydrogenpolysiloxane, dimethylsiloxane/methylhydrogensiloxane are preferable Oxane copolymer (hydrogenated polydimethylsiloxane), more preferably methylhydrogenpolysiloxane, dimethylsiloxane/methylhydrogensiloxane copolymer (hydrogenated polydimethylsiloxane ).

The surface treatment agent used in the alkylalkoxysilane treatment is to improve the dispersibility of the component (C) in the oil-in-water emulsion cosmetics, improve the UV protection effect and emulsion stability, and suppress the after application. From the viewpoint of frictional feel and good makeup application, it is preferably an alkylalkoxysilane having a linear or branched alkyl group having 6 to 20 carbon atoms, and more preferably octyltriethoxysilane ( Triethoxycaprylylsilane), octyltrimethoxysilane (trimethoxycaprylylsilane), more preferably octyltriethoxysilane (triethoxycaprylylsilane).

Examples of the surface treatment agent used in the fatty acid treatment include linear or branched higher fatty acids having 12 to 22 carbon atoms. Among these, the surface treatment agent used in fatty acid treatment is from the viewpoint of improving the dispersibility of component (C) in oil-in-water emulsion cosmetics, improving the UV protection effect and emulsification stability, and suppressing the friction feeling after application , From the viewpoint of making makeup stick well, it is preferably a straight-chain or branched higher fatty acid with a carbon number of 14 to 22, more preferably a straight-chain or branched higher fatty acid with a carbon number of 16 to 20, and further Stearic acid and isostearic acid are preferred.

As mentioned above, the hydrophobic treatment of component (C) is from the viewpoint of improving the dispersibility of component (C) in oil-in-water emulsified cosmetics, improving the UV protection effect and emulsification stability, and suppressing friction after application. It is more preferable to use one or more selected from the group consisting of methylhydrogenpolysiloxane and dimethylsiloxane/methylhydrogensiloxane copolymer as the surface One or more selected from silicone treatment, alkylalkoxysilane treatment, and fatty acid treatment of the treatment agent; Silicone treatment using one or more of hydrogen siloxane copolymers as a surface treatment agent, surface treatment using an alkylalkoxysilane having a linear or branched chain alkyl group having 6 to 20 carbon atoms One or more selected from the alkyl alkoxysilane treatment of an agent, and the fatty acid treatment of a linear or branched higher fatty acid having 14 to 22 carbon atoms as a surface treatment agent.

The said surface treatment agent can be used individually by 1 type or in combination of 2 or more types.

Furthermore, in the case of using titanium oxide as the metal oxide of the component (C), from the viewpoint of reducing the photocatalyst activity, in addition to the surface treatment agent used for the aforementioned hydrophobization treatment, it is also possible to use a combination of carbon dioxide and Silicon, hydrated silicon dioxide; aluminum and other metal hydroxides and other treatment agents.

The amount of hydrophobizing treatment of component (C) is from the viewpoint of improving the dispersibility of component (C) in oil-in-water emulsified cosmetics, improving the UV protection effect and emulsification stability, and suppressing the friction feeling after application , From the viewpoint of making makeup stick well, it is preferably 0.1% by mass or more in component (C), and preferably 40% by mass or less, more preferably 30% by mass or less.

In addition, in this invention, the mass of a component (C) and the average primary particle diameter mentioned later refer to the mass and average primary particle diameter containing a surface treatment agent.

The shape of the component (C) includes, for example, a spherical shape, a flake shape, a plate shape, a rod shape, a spindle shape, a needle shape, and an indeterminate shape, and any shape can be used.

The average primary particle size of the component (C) is preferably 1 μm or less, more preferably 800 nm or less, still more preferably 500 nm or less, still more preferably 300 nm or less, and still more preferably 300 nm or less from the viewpoint of enhancing the ultraviolet protection effect and emulsion stability. It is preferably 200 nm or less, more preferably 100 nm or less, still more preferably 90 nm or less, still more preferably 50 nm or less, still more preferably 40 nm or less, and from the viewpoint of versatility, preferably 1 nm or more, more preferably It is 5 nm or more, more preferably 10 nm or more. More specifically, the average primary particle diameter of the component (C) is preferably 1 nm to 1 μm, more preferably 1 to 800 nm, still more preferably 5 to 500 nm, and still more preferably 5 to 300 nm from the same viewpoint as above. , more preferably 5-200nm, still more preferably 5-100nm, still more preferably 5-90nm, still more preferably 5-50nm, still more preferably 10-50nm, still more preferably 10-40nm.

The average primary particle diameter of the component (C) of this invention can be calculated|required from the observation image of a transmission electron microscope (TEM). Specifically, it was obtained by observing with a TEM at an observation magnification of 50,000 times, measuring the maximum minor diameters of 300 primary particles in the observation image, and calculating the number average. The "maximum minor diameter" here refers to the minor diameter having the largest length among the minor diameters perpendicular to the major diameter when the component (C) has a shape other than flake shape and plate shape. Also, when the component (C) has a flake-like or plate-like shape, the thickness of 300 primary particles in the observation image observed under the same conditions as above was measured, and then the number average was calculated. Specifically, it was measured by the method described in the Examples.

The component (C) can be prepared by a known method using the fine particle metal oxide before hydrophobization treatment as the component (C') and using the above-mentioned surface treatment agent. For example, as the surface treatment using the above-mentioned silicone oil, as described in Japanese Patent No. 3187440, a silicone compound composed of organopolysiloxanes and silicone resin (but silane Compounds) are coated in a non-gaseous state, and then fired at a temperature of 600 to 950°C in an oxygen-containing atmosphere to coat the surface of the fine particle metal oxide with silicon oxide. In addition, as the surface treatment using the above-mentioned alkylalkoxysilane, as described in Japanese Patent Application Laid-Open No. 2007-326902, the fine-particle metal oxide is covered with a specific polysiloxane compound, and then the alkylalkoxysilane is coated. It can be prepared by surface treatment of base silane in water.

In addition, the preferred form and measurement method of the average primary particle diameter of the component (C') (fine particle metal oxide before hydrophobization treatment) used in the hydrophobization treatment are the same as the preferred form and measurement method of the component (C).

Examples of commercially available products of hydrophobized fine particle zinc oxide include FINEX series (manufactured by Sakai Chemical Industry Co., Ltd.); MZ series and MZY series (all of which are manufactured by Tayca Co., Ltd.).

Commercially available products of hydrophobized fine particle titanium oxide include, for example: STR series (manufactured by Sakai Chemical Industry Co., Ltd.); TTO-55 series and TTO-51 series (all of which are manufactured by Ishihara Sangyo Co., Ltd.); series, MTY series (all above are manufactured by TAYCA Co., Ltd.), etc.

The content of the component (C) in the total amount of the oil-in-water emulsified cosmetic of the present invention is preferably at least 1% by mass, more preferably at least 3% by mass, and still more preferably 7% by mass, from the viewpoint of enhancing the UV protection effect. The above, more preferably 10% by mass or more, and from the viewpoint of making the emulsification stability good, preferably 30% by mass or less, more preferably 27% by mass or less, still more preferably 25% by mass or less, still more preferably It is 20 mass % or less. More specifically, it is preferably 1 to 30% by mass, more preferably 3 to 30% by mass, still more preferably 7 to 27% by mass, from the viewpoint of enhancing the ultraviolet protection effect and improving the emulsion stability, More preferably, it is 7-25 mass %, More preferably, it is 10-25 mass %, More preferably, it is 10-20 mass %.

In the total amount of oil-in-water emulsified cosmetics of the present invention, the mass ratio of the content of component (C) to the total content of component (A1) and component (A2) [(C)/(A1+A2)] (hereinafter also referred to as "Content mass ratio [(C)/(A1+A2)]") is preferably 0.25 or more, more preferably 0.30 or more, more preferably 0.40 or more, still more preferably 0.50 or more, still more preferably 0.60 or more, and from the viewpoint of suppressing stickiness during application, preferably 1.8 or less, more preferably 1.5 or less, more preferably 1.3 or less, still more preferably 1.0 or less, still more preferably 0.80 or less. More specifically, it is preferably 0.30 to 1.5, more preferably 0.40 to 1.3, still more preferably 0.50 to 1.0, still more preferably 0.50 to 0.80, still more preferably 0.60 to 0.80.

In the oil-in-water emulsion cosmetic of the present invention, in addition to component (A1), component (A2), component (B) and component (C), within the range that does not inhibit the effect of the present invention, it may also contain Any ingredient used for the purpose. Such optional components include, for example, component (A1), component (A2), ultraviolet absorbers other than component (B) and component (C), oil agents, surfactants, water-soluble polymers, neutralizers, pH Regulators, bactericides, anti-inflammatory agents, preservatives, colorants, chelating agents, whitening agents, antiperspirants, insect repellents, physiologically active ingredients, salts, antioxidants, fragrances, etc.

＜Component (D): Polyol＞

The oil-in-water emulsified cosmetic of the present invention preferably further contains a polyhydric alcohol as a component (D) from the viewpoint of suppressing stickiness at the time of application and improving makeup adhesion.

Component (D) includes, for example: ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (average molecular weight less than 650), 1,2-propylene glycol, 1,3-propylene glycol (propanediol), dipropylene glycol, polypropylene glycol (average molecular weight less than 650), isoprene glycol, 1,3-butanediol and other diols; glycerin, diglycerin, polyglycerin and other polyhydric alcohols with more than three hydrants. Among these, component (D) is preferably a polyhydric alcohol having 2 to 12 carbon atoms, more preferably a polyhydric alcohol having 2 to 6 carbon atoms, still more preferably a polyol selected from ethylene glycol, diethylene glycol, 1 ,1 or more selected from 2-propylene glycol, 1,3-propanediol, dipropylene glycol, 1,3-butanediol, and glycerin, more preferably propylene glycol, dipropylene glycol, 1,3 - One or more selected from butanediol and glycerin. These alcohols may be used alone or in combination of two or more.

The content of the component (D) in the total amount of the oil-in-water emulsified cosmetic of the present invention is preferably 0.5% by mass or more, more preferably 1% by mass, from the viewpoint of suppressing stickiness upon application and improving makeup adhesion. Above, more preferably 2% by mass or more, still more preferably 3% by mass or more, still more preferably 4% by mass or more, still more preferably 5% by mass or more, and preferably 15% by mass or less, more preferably 13% by mass % by mass or less, more preferably 10% by mass or less. More specifically, it is preferably 0.5 to 15% by mass, more preferably 1 to 13% by mass, still more preferably 2 to 13% by mass, still more preferably 3 to 10% by mass, still more preferably 4 to 10% by mass , and more preferably 5 to 10% by mass.

The content of the component (D) in the total amount of the oil-in-water emulsified cosmetic of the present invention is preferably 0.5 mass % or more, more preferably 1 mass % or more, still more preferably 2 mass % or more, still more preferably 3 mass % or more, and preferably 15 mass % or less, more preferably 13 mass % or less, still more preferably 10 mass % % or less, more preferably 7 mass % or less, still more preferably 5 mass % or less. More specifically, it is preferably 0.5 to 15% by mass, more preferably 1 to 13% by mass, still more preferably 2 to 13% by mass, still more preferably 3 to 10% by mass, still more preferably 3 to 7% by mass , and more preferably 3 to 5% by mass.

<Component (E): Surfactant>

The oil-in-water emulsion cosmetic of the present invention preferably further contains a surfactant as a component (E) from the viewpoint of obtaining good emulsion stability.

Component (E) is not particularly limited, and any of nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants can be used. These may be used alone or in combination of two or more.

Among these, component (E) is preferably a nonionic surfactant such as: sorbitan fatty acid ester, polyoxyalkylene hydrogenated castor oil, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene alkyl ether, Polyether modified silicone, etc. Specifically, for example: sorbitan monostearate, sorbitan monoisostearate, polyoxyethylene hydrogenated castor oil (EO average addition mole number 60), polyoxyethylene hydrogenated castor oil (EO The average number of added moles is 40), polyoxyethylene sorbitan monolaurate (the average number of added moles of EO is 20), polyoxyethylene sorbitan monostearate (the average number of added moles of EO is 20) , polyoxyethylene sorbitan oleate (the average number of added moles of EO is 20), polyoxyethylene (the average number of added moles of EO is 7) lauryl ether, polyoxyethylene (the average number of added moles of EO is 7) Methylol propane coconut oil alkyl ether, dimethicone copolyol, etc. These nonionic surfactants may be used alone or in combination of two or more.

The content of the component (E) in the total amount of the oil-in-water emulsified cosmetic of the present invention is preferably at least 0.1% by mass, more preferably at least 0.3% by mass, still more preferably at least 0.5% by mass, and is preferably 3% by mass. or less, more preferably 2% by mass or less, even more preferably 1% by mass or less. More specifically, it is preferably 0.1 to 3 mass%, more preferably 0.3 to 2 mass%, and still more preferably 0.5 to 1 mass%.

＜Component (F): Other water-soluble polymers＞

From the viewpoint of obtaining good emulsion stability, the oil-in-water emulsified cosmetic of the present invention preferably further contains, as component (F), another water-soluble polymer having a thickening effect other than component (B).

Component (F) is not limited as long as it is a component commonly used in cosmetics, and any of natural polymers, semi-synthetic polymers, and synthetic polymers other than component (B) can be used.

Examples of natural polymers include xanthan gum, carrageenan, and alginic acid. Among these, xanthan gum is preferred from the viewpoint of obtaining good emulsion stability.

Examples of semi-synthetic polymers include modified polysaccharides such as hydroxycellulose, hydroxypropylcellulose, sodium carboxymethylcellulose, methylcellulose, hydroxymethylcellulose, and cationized cellulose.

Examples of synthetic polymers other than component (B) include carbomer (cross-linked polyacrylic acid), polyacrylic acid, sodium polyacrylate, (acrylic acid/alkyl methacrylate) copolymer, etc. Acrylic polymers; polyvinylpyrrolidone, polyvinyl alcohol, cationized polyvinylpyrrolidone.

Examples of commercially available carbomers include "Carbopol 910", "Carbopol 934", "Carbopol 940", "Carbopol 941", "Carbopol 980", and "Carbopol 981" (all of which are manufactured by Lubrizol Advanced Materials Co., Ltd.) Wait.

Commercially available (acrylic acid/alkyl methacrylate) copolymers include, for example, "Carbopol 1382", "Carbopol ETD2020", "PEMULEN TR-1", "PEMULEN TR-2" (both are Lubrizol Advanced Materials Co., Ltd.), etc.

The content of the component (F) in the total amount of the oil-in-water emulsified cosmetic of the present invention is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and still more preferably 0.07% by mass, from the viewpoint of obtaining good emulsion stability. It is more than mass %, and from the viewpoint of good usability, it is preferably 5 mass % or less, more preferably 3 mass % or less, and still more preferably 1 mass % or less. More specifically, it is preferably 0.01 to 5 mass%, more preferably 0.05 to 3 mass%, and still more preferably 0.07 to 1 mass%.

(aqueous medium)

The oil-in-water emulsion cosmetic of the present invention contains at least water as an aqueous medium in addition to the component (D). In the present invention, the component (D) and the aqueous medium other than water may further contain, for example, saturated monohydric alcohols having 1 to 3 carbon atoms such as ethanol, propanol, and isopropanol.

The content of the aqueous medium other than the component (D) in the total amount of the oil-in-water emulsified cosmetic of the present invention may be within the range that can be used as an oil-in-water emulsified cosmetic. From the viewpoint of improving the stability of the emulsification, preferably 40% by mass or more, more preferably 45% by mass or more, still more preferably 50% by mass or more, still more preferably 55% by mass or more, still more preferably 60% by mass or more, and preferably 90% by mass or less, more preferably Preferably it is 80 mass % or less, More preferably, it is 75 mass % or less. More specifically, it is preferably 40 to 90% by mass, more preferably 45 to 80% by mass, still more preferably 50 to 75% by mass, still more preferably 55 to 75% by mass, still more preferably 60 to 75% by mass .

The oil-in-water emulsified cosmetics of the present invention are suitable for hair cosmetics such as shampoos, conditioners, and conditioners; and skin cosmetics such as facial cleansers, cleansing cosmetics, sunscreen cosmetics, facial masks, and massage cosmetics. Among these, the oil-in-water emulsified cosmetics of the present invention are excellent in UV protection, so they are suitable for sunscreen applications, and are suitable for sunscreen cosmetics (lotions, creams, emulsions, beauty serums, etc.), suntan agents, makeup bases Makeup cosmetics, foundation, etc.

As the dosage form of the oil-in-water emulsified cosmetic of the present invention, it can also be applied to: liquid, emulsion, cream, paste, solid, multi-layer, etc., and can also be applied to tablets, sprays, mousse agent.

(Manufacturing method of oil-in-water emulsified cosmetics)

The method for producing the oil-in-water emulsified cosmetic of the present invention is not particularly limited, and known methods can be appropriately used depending on the dosage form of the oil-in-water emulsified cosmetic. For example, a method including a step of blending component (A1), component (A2), component (B), component (C) and optionally the aforementioned optional components and uniformly mixing them with a homomixer or the like can be mentioned.

As the production method of the oil-in-water emulsified cosmetic of the present invention, from the viewpoint of improving the dispersibility of component (C) in the oil-in-water emulsified cosmetic, improving the ultraviolet protection effect and emulsification stability, and suppressing smearing From the viewpoint of stickiness at times, good makeup adhesion, and suppression of oily shine due to sebum, it is preferable to include the process of mixing and emulsifying the following dispersion with the following preparation, wherein the dispersion is the composition of (C) A dispersion dispersed in an oil phase component containing component (A1), component (A2) and optionally the aforementioned oil-soluble optional components. The preparation contains component (B), an aqueous medium, and optionally The preparation of the water-phase component of the aforementioned water-soluble optional component to be charged is more preferably a method including the following steps I to III.

Step I: a step of adding component (C) to component (A1), component (A2), and optionally the aforementioned oil-soluble optional component, and uniformly mixing to obtain a dispersion (i) in which component (C) is dispersed;

Step II: a step of uniformly mixing the aqueous phase components containing the component (B), the aqueous medium, and optionally the aforementioned water-soluble optional components to obtain the preparation (ii);

Step III: A step in which the dispersion (i) obtained in step I is added to the preparation (ii) obtained in step II, mixed uniformly and emulsified to obtain an oil-in-water emulsified cosmetic.

Step I preferably includes the following steps I-1 and I-2 from the viewpoint of improving the dispersibility of the component (C) in the oil-in-water emulsified cosmetic.

Step I-1: a step of uniformly mixing the oil phase components containing the component (A1), the component (A2), and optionally the aforementioned oil-soluble optional components to obtain the preparation (i');

Step I-2: A step of adding component (C) to the preparation (i') obtained in step I-1, and uniformly mixing to obtain a dispersion (i) in which component (C) is dispersed.

The mixing of the oil phase components in step I-1 and the mixing of the water phase components in step II are preferably performed while stirring while heating in a temperature range of 20°C to 90°C.

In step II, the obtained preparation (ii) is preferably obtained by uniformly mixing after cooling to a temperature range of preferably 15°C to 35°C.

Furthermore, in the step III, it is preferable to add the dispersion (i) obtained in the step I while stirring the preparation (ii) obtained in the step II, preferably at a temperature of 30° C. or higher and 90° C. or lower, and mix uniformly. and emulsify it.

Regarding the above-mentioned embodiments, the present invention further discloses the following embodiments.

<1> An oil-in-water emulsified cosmetic containing the following component (A1), component (A2), component (B) and component (C):

Component (A1): a water-insoluble organic ultraviolet absorber that is solid at 25°C,

Ingredient (A2): Liquid oil agent,

Component (B): At least one selected from homopolymers of acrylamide, copolymers containing structural units derived from acrylamide-based monomers, and salts thereof, wherein the acrylamide-based monomers are selected from acrylamide and One or more selected from acryloyldimethyltaurine,

Component (C): At least one selected from hydrophobized fine particle zinc oxide and fine particle titanium oxide,

The mass ratio [(C)/(A1+A2)] of the content of the component (C) to the total content of the component (A1) and the component (A2) is 0.30 or more and 1.5 or less;

As the component (A2), the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is 2% by mass or less in the total amount of the oil-in-water emulsified cosmetic.

<2> The oil-in-water emulsion cosmetic as described in said <1> which further contains a polyhydric alcohol as a component (D).

<3> The oil-in-water emulsion cosmetic as described in said <2> whose content of the component (D) in the whole oil-in-water emulsion cosmetic is 1 mass % or more and 13 mass % or less.

<4> The oil-in-water emulsion cosmetic as described in <2> or <3> above, wherein the content of the component (D) in the total amount of the oil-in-water emulsion cosmetic is 3% by mass or more and 10% by mass or less .

<5> The oil-in-water emulsion cosmetic according to any one of <1> to <4> above, wherein the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is less than that of water. The total amount of the oil-in-type emulsified cosmetic is 0.7% by mass or less.

<6> The oil-in-water emulsion cosmetic according to any one of <1> to <4> above, wherein the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is less than that of water. The total amount of the oil-in-type emulsified cosmetic is 0.3% by mass or less.

<7> The oil-in-water emulsified cosmetic according to any one of <1> to <6> above, wherein the content of the component (C) in the total amount of the oil-in-water emulsified cosmetic is relative to that of the component (A1) and The mass ratio [(C)/(A1+A2)] of the total content of the component (A2) is 0.40 or more and 1.3 or less.

<8> The oil-in-water emulsified cosmetic according to any one of <1> to <7> above, wherein the hydrophobizing treatment of the component (C) is selected from silicone treatment, alkylalkoxysilane treatment, and one or more selected from the fatty acid treatment.

<9> The oil-in-water emulsion cosmetic according to any one of <1> to <7> above, wherein the hydrophobizing treatment of the component (C) is selected from the group consisting of methylhydrogenpolysiloxane, and One or more of dimethylsiloxane/methylhydrogensiloxane copolymer (hydrogenated polydimethylsiloxane) is used as a surface treatment agent for silicone treatment, alkylalkoxysilane treatment, and fatty acid 1 or more species selected during processing.

<10> The oil-in-water emulsion cosmetic as described in any one of said <1>-<9> whose average primary particle diameter of a component (C) is 1 nm - 800 nm.

<11> The oil-in-water emulsion cosmetic as described in any one of said <1>-<9> whose average primary particle diameter of a component (C) is 5 nm or more and 100 nm or less.

<12> The oil-in-water emulsified cosmetic according to any one of <1> to <11> above, wherein the content of the component (C) in the total amount of the oil-in-water emulsified cosmetic is 3% by mass or more and 30% by mass or less.

<13> The oil-in-water emulsified cosmetic according to any one of <1> to <11> above, wherein the content of the component (C) in the total amount of the oil-in-water emulsified cosmetic is 7% by mass or more and 25% by mass or less.

<14> The oil-in-water emulsified cosmetic according to any one of <1> to <13> above, wherein the content of the component (B) in the total amount of the oil-in-water emulsified cosmetic is 0.1% by mass or more and 3% by mass or less.

<15> The oil-in-water emulsified cosmetic according to any one of <1> to <13> above, wherein the content of component (B) in the total amount of the oil-in-water emulsified cosmetic is 0.3% by mass or more and 2% by mass or less.

<16> The oil-in-water emulsion cosmetic according to any one of <1> to <15> above, wherein the component (B) is made from polyacrylamide, (acryloyldimethyltaurine Na/acrylic acid One or more kinds selected from Na) copolymer, (Na acryloyldimethyltaurate/hydroxyethyl acrylate) copolymer, and (ammonium acryloyldimethyltaurate/vinylpyrrolidone) copolymer.

<17> The oil-in-water emulsion cosmetic according to any one of <1> to <16> above, wherein the component (A2) contains one or more selected from ester oil and silicone oil.

<18> The oil-in-water emulsion cosmetic according to any one of <1> to <17> above, wherein the component (A1) is 4-tert-butyl-4'-methoxydibenzoyl Methane, 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3, 5-triazine, 2-hydroxy-4-methoxybenzophenone, cresyl trisiloxane, and 2,4-bis{[4-(2-ethylhexyloxy)-2- One or more selected from hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine.

<19> The oil-in-water emulsified cosmetic according to any one of <1> to <18> above, which is used for sun protection.

<20> An oil-in-water emulsified cosmetic, which is used for sun protection and contains: the following component (A1), component (A2), component (B), component (C) and component (D):

Component (A1): a water-insoluble organic ultraviolet absorber that is solid at 25°C,

Ingredient (A2): Liquid oil agent,

Component (B): At least one selected from homopolymers of acrylamide, copolymers containing structural units derived from acrylamide-based monomers, and salts thereof, wherein the acrylamide-based monomers are selected from acrylamide and One or more selected from acryloyldimethyltaurine,

Component (C): At least one selected from hydrophobized fine particle zinc oxide and fine particle titanium oxide having an average primary particle diameter of 1 nm to 800 nm,

Ingredient (D): Polyol,

The mass ratio [(C)/(A1+A2)] of the content of the component (C) to the total content of the component (A1) and the component (A2) is 0.30 or more and 1.5 or less;

As component (A2), the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is 2% by mass or less in the total amount of the oil-in-water emulsified cosmetic;

The content of the component (D) is not less than 1% by mass and not more than 13% by mass.

<21> An oil-in-water emulsified cosmetic, which is used for sun protection and contains: the following component (A1), component (A2), component (B), component (C) and component (D):

Component (A1): a water-insoluble organic ultraviolet absorber that is solid at 25°C,

Ingredient (A2): Liquid oil agent,

Component (B): At least one selected from homopolymers of acrylamide, copolymers containing structural units derived from acrylamide-based monomers, and salts thereof, wherein the acrylamide-based monomers are selected from acrylamide and One or more selected from acryloyldimethyltaurine,

Component (C): At least one selected from hydrophobized fine particle zinc oxide and fine particle titanium oxide having an average primary particle diameter of 5 nm to 100 nm,

Ingredient (D): Polyol,

The mass ratio [(C)/(A1+A2)] of the content of the component (C) to the total content of the component (A1) and the component (A2) is 0.40 or more and 1.3 or less;

As component (A2), the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is 2% by mass or less in the total amount of the oil-in-water emulsified cosmetic;

The content of the component (D) is not less than 3% by mass and not more than 10% by mass.

<22> An oil-in-water emulsified cosmetic, which is used for sun protection and contains: the following component (A1), component (A2), component (B) and component (C):

Component (A1): a water-insoluble organic ultraviolet absorber that is solid at 25°C,

Ingredient (A2): Liquid oil agent,

Component (B): At least one selected from homopolymers of acrylamide, copolymers containing structural units derived from acrylamide-based monomers, and salts thereof, wherein the acrylamide-based monomers are selected from acrylamide and One or more selected from acryloyldimethyltaurine,

Component (C): At least one selected from hydrophobized fine particle zinc oxide and fine particle titanium oxide having an average primary particle diameter of 5 nm to 100 nm,

The mass ratio [(C)/(A1+A2)] of the content of the component (C) to the total content of the component (A1) and the component (A2) is 0.40 or more and 1.3 or less;

As component (A2), the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is 2% by mass or less in the total amount of the oil-in-water emulsified cosmetic;

The hydrophobizing treatment of component (C) is one kind selected from methylhydrogenpolysiloxane, dimethylsiloxane/methylhydrogensiloxane copolymer (hydrogenated polydimethylsiloxane) One or more selected from the above silicone treatment, alkylalkoxysilane treatment, and fatty acid treatment used as a surface treatment agent.

<23> An oil-in-water emulsified cosmetic, which is used for sun protection and contains: the following component (A1), component (A2), component (B), component (C) and component (D):

Component (A1): a water-insoluble organic ultraviolet absorber that is solid at 25°C,

Ingredient (A2): Liquid oil agent,

Component (B): At least one selected from homopolymers of acrylamide, copolymers containing structural units derived from acrylamide-based monomers, and salts thereof, wherein the acrylamide-based monomers are selected from acrylamide and One or more selected from acryloyldimethyltaurine,

Component (C): At least one selected from hydrophobized fine particle zinc oxide and fine particle titanium oxide having an average primary particle diameter of 5 nm to 100 nm,

Ingredient (D): Polyol,

The mass ratio [(C)/(A1+A2)] of the content of the component (C) to the total content of the component (A1) and the component (A2) is 0.40 or more and 1.3 or less;

As component (A2), the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is 2% by mass or less in the total amount of the oil-in-water emulsified cosmetic;

The hydrophobizing treatment of component (C) is one kind selected from methylhydrogenpolysiloxane, dimethylsiloxane/methylhydrogensiloxane copolymer (hydrogenated polydimethylsiloxane) One or more selected from the above silicone treatment, alkylalkoxysilane treatment, and fatty acid treatment used as a surface treatment agent;

The content of the component (D) is not less than 1% by mass and not more than 13% by mass.

<24> The oil-in-water emulsified cosmetic according to any one of <20> to <23> above, wherein the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is less than that of water. The total amount of the oil-in-type emulsified cosmetic is 0.7% by mass or less.

<25> The oil-in-water emulsified cosmetic according to any one of <20> to <23> above, wherein the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is less than that of water. The total amount of the oil-in-type emulsified cosmetic is 0.3% by mass or less.

<26> The oil-in-water emulsified cosmetic according to any one of <20> to <25> above, wherein the content of component (C) in the total amount of the oil-in-water emulsified cosmetic is 3% by mass or more and 30% by mass or less.

<27> The oil-in-water emulsified cosmetic according to any one of <20> to <25> above, wherein the content of the component (C) in the total amount of the oil-in-water emulsified cosmetic is 7% by mass or more and 25% by mass or less.

<28> The oil-in-water emulsified cosmetic according to any one of <20> to <27> above, wherein the content of component (B) in the total amount of the oil-in-water emulsified cosmetic is 0.1% by mass or more and 3% by mass or less.

<29> The oil-in-water emulsified cosmetic according to any one of <20> to <27> above, wherein the content of component (B) in the total amount of the oil-in-water emulsified cosmetic is 0.3% by mass or more and 2% by mass or less.

<30> The oil-in-water emulsified cosmetic according to any one of <20> to <29> above, wherein the component (B) is obtained from polyacrylamide, (acryloyldimethyltaurine Na/acrylic acid One or more kinds selected from Na) copolymer, (Na acryloyldimethyltaurate/hydroxyethyl acrylate) copolymer, and (ammonium acryloyldimethyltaurate/vinylpyrrolidone) copolymer.

<31> The oil-in-water emulsion cosmetic according to any one of <20> to <30>, wherein the component (A2) contains one or more selected from ester oil and silicone oil.

<32> The oil-in-water emulsion cosmetic according to any one of <20> to <31> above, wherein the component (A1) is 4-tert-butyl-4'-methoxydibenzoyl Methane, 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3, 5-triazine, 2-hydroxy-4-methoxybenzophenone, cresyl trisiloxane, and 2,4-bis{[4-(2-ethylhexyloxy)-2- One or more selected from hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine.

[Example]

Hereinafter, the present invention will be described in detail using examples and comparative examples, but the present invention is not limited thereto.

(Average primary particle size of component (C) and component (C'))

The average primary particle diameter of a component (C) and a component (C') is measured by the following method.

When the measurement sample has a shape other than flake shape and plate shape, the previously prepared measurement sample dispersion liquid is placed on the sample of a transmission electron microscope (TEM) (trade name "JEM1400Plus", manufactured by JEOL Ltd.) On the stage, after air-drying, use TEM to observe at an observation magnification of 50,000 times, measure the maximum short diameter of 300 primary particles in the observed image, and then set the number average as the respective average primary particle diameter. Here, the "maximum short diameter" refers to the short diameter having the largest length among the short diameters perpendicular to the long diameter.

When the measured sample has a flake-like or plate-like shape, measure the thickness of 300 primary particles in the observed image under the same method and observation magnification as above, and then set the number average as the respective average primary particle path.

In addition, the dispersion of the measurement sample was prepared by adding 95 g of ethanol as a solvent to 5 g of the measurement sample, followed by ultrasonic dispersion.

Preparation Example 1 (Preparation of Polydimethylsiloxane Treated Microparticle Zinc Oxide C1)

88 parts by mass of fine particle zinc oxide (slightly spherical shape, average primary particle diameter 25nm) as component (C'), and dimethylpolysiloxane (polydimethylsiloxane) (kinematic viscosity 20 mm ² /s, manufactured by Shin-Etsu Chemical Co., Ltd.) 12 parts by mass were put into toluene, and after fully stirring, the toluene was removed by heating under reduced pressure. The obtained powder is pulverized using an ultrafine pulverizer. Next, firing treatment was performed at 800° C. for 2 hours in air using a high-temperature heating furnace to obtain polydimethylsiloxane-treated fine particle zinc oxide C1 as component (C).

Preparation Example 2 (Preparation of Methyl Hydrogen Polysiloxane Treated Microparticle Zinc Oxide C2)

93 parts by mass of fine-particle zinc oxide (spherical, average primary particle size: 35 nm) as component (C') and methylhydrogen polysiloxane (manufactured by Shin-Etsu Chemical Co., Ltd. "KF-99P") as a surface treatment agent were prepared. ") 7 parts by mass and a slurry composed of isopropanol, after being fully stirred and pulverized, the solvent is distilled off under reduced pressure, and in the air, heat treatment is carried out at 150°C for 4 hours to obtain the component (C ) of methylhydrogenpolysiloxane treated particulate zinc oxide C2.

Preparation Example 3 (Preparation of Triethoxycaprylylsilane Treated Microparticle Zinc Oxide C3)

Made of 93 parts by mass of fine particle zinc oxide (spherical shape, average primary particle size 35nm) as component (C'), and 7 parts by mass of octyltriethoxysilane (triethoxycaprylylsilane) as a surface treatment agent parts, and a slurry composed of toluene was pulverized and crushed using a bead mill (bead mill manufactured by SHINMARU ENTERPRISES Co., Ltd.). Next, toluene was heated and distilled off under reduced pressure, and heat treatment was performed at 150° C. for 4 hours using a blower airflow dryer to obtain triethoxyoctanoylsilane-treated fine particle zinc oxide C3 as component (C).

Preparation Example 4 (Preparation of Polydimethylsiloxane Treated Particulate Titanium Oxide C4)

88 parts by mass of microparticle titanium oxide (slightly spherical shape, average primary particle diameter: 10 nm) as component (C'), and dimethyl polysiloxane (polydimethylsiloxane) (kinematic viscosity 20 mm ² /s, manufactured by Shin-Etsu Chemical Co., Ltd.) 12 parts by mass were put into toluene, and after fully stirring, the toluene was removed by heating under reduced pressure. The obtained powder is pulverized using an ultrafine pulverizer. Next, firing treatment was performed at 800° C. in air for 2 hours using a high-temperature heating furnace to obtain polydimethylsiloxane-treated fine particle titanium oxide C4 as component (C).

[Examples 1-26, Comparative Examples 1-6, Reference Example 1]

According to the formulations shown in Tables 1 to 4, each oil-in-water emulsified cosmetic was obtained by the following method.

Components 1 to 21 and 46 shown in Tables 1 to 4 were uniformly mixed, heated and dissolved at 80° C., and prepared product (i′) was obtained (step I-1). Next, with the obtained preparation (i') kept at 80° C., components 27 to 33 shown in Tables 1 to 4 were added and uniformly mixed to disperse them to obtain dispersion (i) (step I- 2).

In addition, ingredients 22-26, 34-45, 49, and 50 shown in Tables 1 to 4 were heated to 40°C to dissolve, and after naturally cooling to 25°C, ingredients 47 and 48 were added and mixed uniformly to obtain a preparation ( ii) (step II).

While stirring the obtained preparation (ii), the dispersion (i) maintained at 80° C. was added, mixed uniformly using a homomixer, and emulsified to obtain an oil-in-water emulsified cosmetic (step III).

Using the obtained oil-in-water emulsified cosmetics, the following are shown: (1) ultraviolet protection ability, (2) emulsion stability, and (3) feeling in use (no sticky feeling when applied, no sticky feeling immediately after application) The goodness of makeup adhesion and the lack of oily feeling due to sebum after 3 hours of application) were evaluated.

In addition, for Comparative Examples 2 and 3, since they were inhomogeneous and separated into an oil phase and a water phase immediately after preparation, only the emulsion stability was evaluated, and the ultraviolet protection ability and usability were not evaluated.

The results are shown in Tables 1 to 4.

(1) UV protection ability

The oil-in-water emulsified cosmetics shown in Tables 1 to 4 were evenly applied on a square PMMA plate ("HD6" manufactured by Helio Screen Co., Ltd.) with an application amount of 1.3 mg/ ^cm2 , and allowed to dry naturally for 15 minutes to form Samples for measurement. Each prepared sample was irradiated with ultraviolet light from a fixed distance (10 mm) using an SPF analyzer (Optometices). With respect to the transmitted ultraviolet rays at this time, 10 points in each sample were detected in a wavelength range of 290 to 400 nm using the SPF analyzer, an averaged spectrum was obtained, and an SPF value was calculated.

From each SPF value, according to the following formula, calculate the ultraviolet protection ability improvement rate relative to Reference Example 1 (replacing the component (A1) in the compounding of Example 1 with purified water) that does not contain the component (A1), and calculate it according to the following formula: The above evaluation criteria are evaluated.

Ultraviolet defense ability improvement rate (%)=[(SPF value of embodiment or comparative example)/(SPF value of reference example 1)]*100

[Evaluation criteria for improvement rate of UV protection ability]

5: More than 250%

4: More than 200% and less than 250%

3: More than 150% and less than 200%

2: More than 100 and less than 150%

1: Less than 100%

(2) Emulsion stability

The emulsified state immediately after the preparation of the oil-in-water emulsion cosmetics shown in Tables 1 to 4 was observed with a microscope, and the external appearance was observed visually, and evaluated according to the following criteria.

[judgment criteria]

5: Component (C) enters the internal phase (oil phase), and the emulsified particle size ranges from 10 to 50 μm, showing a very narrow particle size distribution, forming beautiful, slightly spherical emulsified particles without aggregation of the emulsified particles. Even by visual observation, it exhibits a bright and beautiful appearance.

4: Component (C) enters the internal phase (oil phase), and the emulsified particle size shows a narrow particle size distribution in the range of 10-100 μm, forming beautiful slightly spherical emulsified particles without aggregation of emulsified particles. A beautiful appearance without roughness was exhibited even by visual observation.

3: Component (C) enters the internal phase (oil phase), and although emulsified particles are formed, the emulsified particles aggregate a day after preparation.

2: Although the component (C) enters the inner phase (oil phase), the emulsified particles are not uniform, and aggregation of the emulsified particles occurs immediately after preparation. The appearance was also found to be slightly rough when observed visually.

1: Component (C) leaked to the external phase (water phase), or did not form emulsified particles, separated into an oil phase and a water phase, and was observed to have uneven appearance by visual observation.

(3) Feeling in use (no sticky feeling when applied, good makeup adhesion immediately after application, and no oily feeling caused by sebum after 3 hours after application)

For the oil-in-water emulsified cosmetics shown in Tables 1 to 4, 10 professional reviewers for cosmetic evaluation conducted usage tests. Each professional reviewer used each cosmetic product to evaluate "no stickiness when applied", "good adhesion of makeup immediately after application", and "no oily feeling due to sebum after 3 hours after application" according to the following The above-mentioned evaluation criteria are evaluated and scored in 5 stages, and the average value is calculated from the sum of the scores of the cosmetics by 10 professional reviewers. The average value of each evaluation is shown in Table 1 - Table 4, respectively.

The higher the above-mentioned average value, the better the effect. If the average value exceeds 4.0, it is rated as very good, if the average value is 4.0 or less and exceeds 3.0, it is rated as good, and if the average value is 3.0 or less and exceeds 2.0, it is rated as good. Slightly poor, rated as poor if the average is below 2.0.

In addition, with regard to "good makeup adhesion immediately after application", the makeup adhesion was evaluated when each oil-in-water emulsion cosmetic was applied to the skin, and foundation was applied on top; No shine due to sebum after 3 hours" is to evaluate whether there is any shine due to sebum after 3 hours after applying each oil-in-water emulsified cosmetic to the skin, and then applying foundation on top.

[evaluation criteria]

5: good

4: slightly good

3: normal

2: slightly bad

1: Bad [Table 1]

[Table 2]

[table 3]

[Table 4]

The details of the ingredients used in Tables 1 to 4 are as follows:

*1: "PARSOL 1789" made by DSM Corporation

*2: "UVINUL A PLUS" made by BASF Corporation

*3: "UVINUL T-150" manufactured by BASF Corporation

*4: "UVINUL M40" manufactured by BASF Corporation

*5: "Mosacare A440" manufactured by UFC CORPORATION

*6: "TINOSORB S" manufactured by BASF Corporation

*7: "KF-96A-6cs" manufactured by Shin-Etsu Chemical Co., Ltd.

*8: "UVINUL MC80" manufactured by BASF Corporation

*9: "SEPIGEL 305" manufactured by SEPPIC Corporation (polyacrylamide, active ingredient 40% by mass)

*10: "SIMULGEL EG" manufactured by SEPPIC Corporation ((Na acryloyldimethyltaurine/Na acrylic acid) copolymer, active ingredient 37.5% by mass)

*11: "SEPINOV EMT 10" ((Na acryloyldimethyltaurine/hydroxyethyl acrylate) copolymer, active ingredient 89.3% by mass) manufactured by SEPPIC Corporation,

*12: "Aristoflex AVC" manufactured by Clariant Corporation ((ammonium acryloyldimethyltaurate/vinylpyrrolidone) copolymer, active ingredient 100% by mass)

*13: "PEMULEN TR-1" manufactured by Lubrizol Advanced Materials

*14: Polydimethylsiloxane-treated fine particle zinc oxide C1 obtained in Preparation Example 1

*15: Methylhydropolysiloxane-treated fine particle zinc oxide C2 obtained in Preparation Example 2

*16: Triethoxycaprylylsilane-treated fine particle zinc oxide C3 obtained in Preparation Example 3

*17: Polydimethylsiloxane-treated fine particle titanium oxide C4 obtained in Preparation Example 4

*18: "STR-100W-LP" manufactured by Sakai Chemical Industry Co., Ltd. (average primary particle size: 10nm)

*19: "STR-100W-OTS" manufactured by Sakai Chemical Industry Co., Ltd. (average primary particle size: 10nm)

*20: TAYCA Co., Ltd. "Minute Titanium Oxide MT-N1" (average primary particle size 7nm)

*21: Dow Toray Co., Ltd. "DOWSIL AMS-C30 COSMETIC WAX" (alkyl-modified (C30) silicone)

From Tables 1 to 4, it can be seen that the oil-in-water emulsified cosmetics of the examples of the present invention have excellent ultraviolet protection ability and excellent emulsification stability compared with the oil-in-water emulsified cosmetics of the comparative examples. Less stickiness, makeup adheres well, and shine caused by sebum is suppressed.

Claims (10)

1. An oil-in-water emulsified cosmetic, wherein, Contains the following component (A1), component (A2), component (B), and component (C): Component (A1): a water-insoluble organic ultraviolet absorber that is solid at 25°C, Ingredient (A2): Liquid oil agent, Component (B): acrylamide polymer, Ingredient (C): Hydrophobized fine particle metal oxide, The mass ratio (C)/(A1+A2) of the content of the component (C) to the total content of the component (A1) and the component (A2) is 0.25 or more and 1.8 or less, As the component (A2), the total content of 2-ethylhexyl p-methoxycinnamate and octocrylene is 2% by mass or less in the total amount of the oil-in-water emulsified cosmetic. 2. The oil-in-water emulsified cosmetic according to claim 1, wherein: It further contains a polyhydric alcohol as a component (D). 3. The oil-in-water emulsion cosmetic according to claim 1 or 2, wherein: The particulate metal oxide of the component (C) is one or more selected from particulate zinc oxide and particulate titanium oxide. 4. The oil-in-water emulsified cosmetic according to any one of claims 1 to 3, wherein: The hydrophobization treatment of the component (C) is one or more types selected from silicone treatment, alkylalkoxysilane treatment, and fatty acid treatment. 5. The oil-in-water emulsified cosmetic according to any one of claims 1 to 4, wherein: The hydrophobization treatment of component (C) is made from a silicone that uses at least one selected from methylhydrogenpolysiloxane and dimethylsiloxane/methylhydrogensiloxane copolymer as a surface treatment agent One or more selected from among treatment, alkylalkoxysilane treatment, and fatty acid treatment. 6. The oil-in-water emulsified cosmetic according to any one of claims 1 to 5, wherein: The content of the component (C) is not less than 3% by mass and not more than 30% by mass. 7. The oil-in-water emulsion cosmetic according to any one of claims 1 to 6, wherein: Component (A2) contains 1 or more types selected from ester oil and silicone oil. 8. The oil-in-water emulsified cosmetic according to any one of claims 1 to 7, wherein: Component (A1) is derived from 4-tert-butyl-4'-methoxydibenzoylmethane, 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2,4,6 - Tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, cresyltrizole trisiloxane, and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine more than 1 species. 9. The oil-in-water emulsion cosmetic according to any one of claims 1 to 8, wherein: Component (B) is at least one selected from homopolymers of acrylamide, copolymers containing structural units derived from acrylamide monomers, and salts thereof, wherein the acrylamide monomers are selected from acrylamide and One or more types selected from acryloyldimethyltaurine. 10. The oil-in-water emulsion cosmetic according to any one of claims 1 to 9, wherein: For sun protection purposes.