JP6110634B2 - Oil-in-water emulsified cosmetic - Google Patents

Description

  The present invention relates to an oil-in-water emulsified cosmetic.

  In cosmetics, powders such as zinc oxide for UV protection and coloring pigments for covering skin spots and dullness are blended (for example, Patent Document 1 and Patent Document 2).

JP 2005-272389 A JP 2010-215602 A

  When cosmetics containing powder are applied to the skin, it feels squeaky, difficult to stretch, the powder cannot be applied uniformly, and looks unnatural or uncomfortable. was there.

  The present inventors can obtain an oil-in-water emulsified cosmetic that solves the above problems by using a combination of a crosslinked (meth) acrylic ester resin powder and a sodium acrylate / acryloyldimethyltaurine copolymer. I found out.

The present invention includes the following components (A), (B), (C) and (D):
(A) Crosslinked (meth) acrylic ester resin powder 0.1 to 10% by mass,
(B) sodium acrylate / acryloyldimethyltaurine copolymer 0.05-2% by mass,
(C) 1-25% by mass of liquid oil at 25 ° C.
(D) Hydrophobic treated powder 1-25% by mass,
(E) An oil-in-water emulsified cosmetic containing water and having a mass ratio (A) / (D) of component (A) to component (D) of 0.004 to 10 is provided.

  The oil-in-water emulsified cosmetic of the present invention reduces the squeaky feeling when applied to the skin, and is easy to stretch and can be applied uniformly to the skin, so that it does not feel strange and looks natural. . In addition, the smooth feel continues.

  The crosslinked (meth) acrylic acid ester resin powder of component (A) used in the present invention is at least one monomer selected from acrylic acid ester and methacrylic acid ester (hereinafter referred to as (meth) acrylic acid ester single amount). And a crosslinked (meth) acrylic ester resin powder obtained by copolymerizing a monomer component containing a monomer having a carboxyl group. In the present specification, “(meth) acryl” is a concept including both acrylic and methacrylic.

  The (meth) acrylic acid ester monomer used here is preferably a (meth) acrylic acid alkyl ester having 1 to 18 carbon atoms in the alkyl group. Specifically, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate , Stearyl (meth) acrylate and the like. Among these, alkyl (meth) acrylates having 4 to 18 carbon atoms in the alkyl group such as butyl (meth) acrylate, lauryl (meth) acrylate, and stearyl (meth) acrylate are more preferable. You may use these in combination of multiple types. The proportion of the (meth) acrylic acid ester monomer in all monomer components (including a crosslinkable monomer described later) is preferably 30 to 98% by mass, more preferably 50 to 85% by mass. .

  Examples of the monomer having a carboxyl group include (meth) acrylic acid, maleic acid, fumaric acid, crotonic acid, and itaconic acid. You may use these in combination of multiple types. The proportion of the monomer having a carboxyl group in all the monomer components is 0.1 to 30 mass from the viewpoint of suppressing aggregation of the powder and obtaining a good powder feel (smoothness, smooth feeling). % Is preferable, and 1 to 10% by mass is more preferable.

  A part of the carboxyl groups contained in the crosslinked (meth) acrylic acid ester resin powder may be neutralized. The base for neutralization is preferably an inorganic base such as sodium hydroxide, potassium hydroxide or ammonia, but organic bases such as amines, alkanolamines and basic amino acids can also be used. From the viewpoint of further improving the smoothness and smoothness of the powder, the degree of neutralization is preferably 1 to 30%, more preferably 1 to 20%. Here, the degree of neutralization represents the ratio of the number of moles of the added base to the number of moles of the carboxyl group of the monomer having a carboxyl group, expressed as a percentage.

  The monomer component preferably contains a crosslinkable monomer having two or more vinyl groups as a crosslinking agent. Such crosslinkable monomers include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, decaethylene glycol di (meth) acrylate, pentadecaethylene glycol di ( (Meth) acrylate, 1,3-butylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, glycerin di (meth) acrylate, (meth) Allyl acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, diethylene glycol di (meth) acrylate phthalate, caprolactone-modified dipentaerythritol hexa (meth) Acrylate, caprolactone-modified hydroxypivalate ester neopentyl glycol di (meth) acrylate, polyester (meth) acrylate, urethane (meth) acrylate and other (meth) acrylate crosslinkable monomers, divinylbenzene, divinylnaphthalene and these And aromatic divinyl monomers such as derivatives thereof. These may be used alone or in combination of two or more.

  Among these crosslinkable monomers, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, 1,4- (Poly) alkylene glycol di (meth) acrylate such as butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, caprolactone-modified dipentaerythritol hexa (meth) acrylate, caprolactone-modified hydroxypivalate ester neo Since pentyl glycol di (meth) acrylate and polyester (meth) acrylate have low skin irritation, they are more suitable for use as oil-in-water emulsified cosmetics. These crosslinkable monomers are preferably used in an amount of 3 to 50% by mass with respect to the total monomer components.

  As a monomer component, in addition to the above (meth) acrylic acid ester monomer, a monomer having a carboxyl group and a crosslinkable monomer, other monomers copolymerizable with these may be copolymerized. Good. Examples of other monomers include styrene, (meth) acrylonitrile, (meth) acrylamide, vinyl acetate, vinyl pyrrolidone and the like.

  Crosslinked (meth) acrylic acid ester resin powder is, for example, a monomer component containing the above (meth) acrylic acid ester monomer, a monomer having a carboxyl group and a crosslinkable monomer, It can be obtained by polymerization by aqueous suspension polymerization, emulsion polymerization, seed polymerization, dispersion polymerization or the like using a polymerization initiator or the like. Of these, the aqueous suspension polymerization method is preferred from the viewpoint that it is easy to obtain spherical and uniform resin powder.

Aqueous suspension polymerization is performed by mixing an oil phase containing a monomer and an aqueous phase, and then raising the temperature while stirring. At this time, a surfactant is used as a dispersant. The amount of the surfactant used is preferably 0.01 to 50 parts by mass, more preferably 0.01 to 10 parts by mass, and still more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of all monomer components. preferable.
Here, as the surfactant, those having a sulfonic acid (salt) group are preferable from the viewpoint of obtaining a smooth and smooth resin powder.

  Examples of the surfactant having a sulfonic acid (salt) group include those described in paragraph Nos. 0032 to 0036 of JP-A No. 2003-146826. Among them, an alkyl or alkenyl ether sulfonic acid or a salt thereof, which has an alkyl group or alkenyl group having 5 to 30 carbon atoms and may have an average of 0.5 to 25 moles of alkylene oxide added in one molecule, and carbon An acylated taurine having an alkyl group or an alkenyl group of 5 to 30 or a salt thereof is preferred, and an acylated taurine (salt) represented by the following general formula (I) is more preferred.

R ¹ CONR ² CH ₂ CH ₂ SO ₃ M (I)
[Wherein R ¹ represents an optionally substituted alkyl group or alkenyl group having 5 to 30 carbon atoms, R ² represents a hydrogen atom or a methyl group, and M represents a hydrogen atom or a cation]

In general formula (I), as R < ¹ >, a C6-C24 alkyl group or alkenyl group is preferable. Specific examples include hexyl, octyl, nonyl, decyl, undecyl, dodecyl, tetradecyl, hexadecyl, octadecyl, eicosyl, docosyl, tetracosyl, decenyl, dodecenyl, tetradecenyl, Hexadecenyl group, octadecenyl group, eicocenyl group and the like can be mentioned. Examples of the substituent for the alkyl group or alkenyl group include a hydroxyl group, a carboxyl group, an ester group, an ether group, and an amide group.

  Examples of the cation represented by M include cations such as alkali metal, ammonium, alkyl or alkenylamine having 1 to 22 carbon atoms, alkanolamine having 1 to 22 carbon atoms, basic amino acid salt, lithium, sodium, Alkali metals such as potassium are preferred, and sodium is more preferred.

Examples of the polymerization initiator used for the polymerization include benzoyl peroxide, lauroyl peroxide, octanoyl peroxide, benzoyl peroxide, methyl ethyl ketone peroxide, diisopropyl peroxydicarbonate, cumene hydroperoxide, and t-butyl hydroperoxide. And oil-soluble peroxides such as 2,2′-azobisisobutyronitrile and 2,2′-azobis (2,4-dimethylvaleronitrile). The addition amount of the polymerization initiator is preferably 0.1 to 10% by mass with respect to all monomer components.
The polymerization temperature and the polymerization time are not particularly limited, but the polymerization temperature is preferably 40 to 100 ° C. and the polymerization time is preferably 1 to 15 hours.

  The shape of the resin powder of component (A) is preferably a spherical body from the viewpoint of good touch on the skin, good elongation, freezing, and reduction of squeaky feeling. The average particle diameter is preferably 1 μm or more, more preferably 1.5 μm or more, and further preferably 2 μm or more from the viewpoint of further reducing the squeaky feeling. On the other hand, 10 μm or less is preferable, 8 μm or less is more preferable, and 6 μm or less is more preferable from the viewpoint of suppressing the roughness and further improving the skin fixing property. The average particle size is preferably 1 to 10 μm, more preferably 1.5 to 8 μm, and still more preferably 2 to 6 μm.

  The average particle size is a weight average of a powder water suspension at 20 ° C. with a relative refractive index of 1.1 using a laser diffraction type particle size distribution measuring device (for example, LA-920, manufactured by Horiba, Ltd.). It can be determined by measuring the particle size.

The cross-linked (meth) acrylic acid ester resin powder of component (A) preferably has a compressive strength of 0.7 to 10 kgf / mm ² from the viewpoint of obtaining a non-sticky and smooth skin. 8 kgf / mm ² is more preferable.

Here, the compression strength is obtained by the following formula from the load and the particle diameter at the time of 10% deformation of the particle diameter when the resin particle is subjected to a compression test by the MCT-M200 manufactured by Shimadzu Corporation. This is a calculated value. The compressive strength is measured at 25 ° C.
In addition, the compressive strength of the resin particles can be appropriately adjusted by controlling the types and blending amounts of the monomer and the crosslinking agent that constitute the resin particles.

Compressive strength (kgf / mm ² ) = 2.8 × load (kgf) / {π × particle diameter (mm) × particle diameter (mm)}

As the component (A), those described in JP-A-2006-225311 can be used.
The reason why the component (A) is combined with the hydrophobically treated powder of the component (D) described later, suppresses the squeakiness, is easy to stretch, and can be applied uniformly to the skin. ) And the size of the particle diameter, it can be considered that the component (A) is also hydrophilic. The reason for this is that, in the emulsion, component (A) is hydrophilic and therefore present in the aqueous phase, component (D) is hydrophobic and therefore present in the oil phase, and hydrophilic / hydrophobic properties are present. Because it is different, it is considered that even when applied to the skin, they do not approach each other and aggregate. That is, when applied, the component (A) and the component (D) are stretched on the skin without agglomeration, the component (A) stretches well, and the component (D) is also stretched accordingly. It becomes difficult to feel squeaky, and it becomes possible to stretch evenly on the skin. On the other hand, when the component (A) is hydrophobic, it is considered that it exists in the same oil phase as the component (D) in the emulsion and aggregates with the component (D). Therefore, it is predicted that the effect of the hydrophilic component (A) cannot be exhibited. For these reasons, since the component (A) is hydrophilic, it is considered that it can be stretched uniformly on the skin without feeling squeaky.

  The component (A) can be used alone or in combination of two or more, and the content of the component (A) is smooth and natural with a smooth coating feeling, and is excellent in stability. 1 mass% or more is preferable, 0.5 mass% or more is more preferable, 1 mass% or more is further more preferable, 10 mass% or less is preferable, 8 mass% or less is more preferable, and 5 mass% or less is still more preferable. Moreover, it is preferable to contain 0.1-10 mass% of components (A) in the whole composition, 0.5-8 mass% is more preferable, and it is still more preferable to contain 1-5 mass%.

  The component (B) used in the present invention is a sodium acrylate / acryloyldimethyltaurine copolymer, which is described in the International Cosmetic Ingredient Dictionary as “SODIUM ACRYLATE / ACRYLOYLDIMETHYL TAURATE COPOLYMER”. It is a copolymer. As a commercial product containing the polymer, there is SIMULGEL EG (made by SEPPIC) containing 37.5% by mass of sodium acrylate / acryloyldimethyltaurine copolymer and isohexadecane, polysorbate 80 and water as other components. This can be preferably used.

  Component (B) can be used singly or in combination of two or more, and the content is 0.05% by mass or more in the total composition in terms of thickening effect, stability, and feeling of close contact with the skin. Is preferable, 0.1 mass% or more is more preferable, 0.3 mass% or more is further preferable, 2 mass% or less is preferable, 1.2 mass% or less is more preferable, and 1 mass% or less is more preferable. The component (B) is preferably contained in the total composition in an amount of 0.05 to 2% by mass, more preferably 0.1 to 1.2% by mass, and further preferably 0.3 to 1% by mass. preferable.

The oil agent of component (C) used in the present invention is used in ordinary cosmetics, and can be used without particular limitation as long as it is liquid at 25 ° C.
For example, vegetable oils such as jojoba oil and olive oil; animal oils such as liquid lanolin; linear or branched hydrocarbon oils such as liquid paraffin, light isoparaffin, squalane and squalene; neopentyl glycol dicaprate, isopropyl palmitate, paramethoxysilicate Citric acid 2-ethylhexyl, cetyl 2-ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, diisopropyl sebacate, glyceryl tri-2-ethylhexanoate, pentaerythrityl tetra-2-ethylhexanoate, succinic acid Polyester alcohol fatty acid esters such as diethylhexyl, ester oils such as alkyl benzoates having 12 to 15 carbon atoms; dimethylpolysiloxane, dimethylcyclopolysiloxane, methylphenylpolysiloxane, methyl Hydrogen polysiloxane, silicone oils such as higher alcohol-modified silicone oil; fluoropolyether, fluorine oils such as perfluoroalkyl ether silicone.
Of these, ester oils and silicone oils are preferred, and dimethylpolysiloxane and dimethylcyclopolysiloxane are more preferred due to the refreshing feel and stability.

  Component (C) can be used singly or in combination of two or more, and the content is preferably 1% by mass or more, more preferably 5% by mass or more, and more preferably 10% by mass in the total composition. % Or more is more preferable, 25 mass% or less is preferable, 22 mass% or less is more preferable, and 20 mass% or less is still more preferable. Moreover, it is preferable to contain 1-25 mass% of components (C) in the whole composition, 5-22 mass% is more preferable, and it is still more preferable to contain 10-20 mass%.

The powder of the hydrophobically treated powder of component (D) is not particularly limited as long as it is an extender pigment or a color pigment used in ordinary cosmetics. For example, silicic acid, anhydrous silicic acid, magnesium silicate, Talc, sericite, mica, kaolin, bengara, clay, bentonite, titanium-coated mica, bismuth oxychloride, zirconium oxide, magnesium oxide, titanium oxide, zinc oxide, aluminum oxide, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, Inorganic powders such as magnesium carbonate, iron oxide, ultramarine, chromium oxide, chromium hydroxide, calamine and carbon black, and composites thereof; polyamide, polyester, polypropylene, polystyrene, polyurethane, vinyl resin, urea resin, phenol resin, fluorine Resin, silicon resin, acrylic resin Organic powders such as melamine resin, epoxy resin, polycarbonate resin, divinylbenzene / styrene copolymer, silk powder, cellulose, long-chain alkyl phosphate metal salt, N-mono long-chain alkyl acyl basic amino acid, and complexes thereof A composite powder of the above inorganic powder and organic powder.
The shape and particle size of these powders are not particularly limited, and include fine particle powders.

As the powder of component (D), it is preferable to use fine particles of zinc oxide, titanium oxide, and coloring pigment. The particle size of fine particles of zinc oxide and titanium oxide is preferably 20 to 100 nm, more preferably 30 to 90 nm, still more preferably 35 to 80 nm. 10 to 10 μm is preferable, 0.1 to 5 μm is more preferable, and 0.5 to 3 μm is still more preferable.
The colored pigment is not particularly limited as long as it is a white or colored pigment. For example, clay, bentonite, titanium-coated mica, bismuth oxychloride, zirconium oxide, magnesium oxide, titanium oxide, zinc oxide, aluminum oxide, Examples include inorganic pigments such as calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, iron oxide, ultramarine, chromium oxide, chromium hydroxide, calamine and carbon black, and composites thereof.

  The hydrophobic treatment of the powder subjected to the hydrophobic treatment of the component (D) can use a normal surface treatment method. For example, fat or oil is adsorbed on the powder surface, or a functional group such as a hydroxyl group is used for esterification, Oil treatment method that causes etherification to make the powder oleophilic, metal soap treatment method using zinc salt, fatty acid salt or aluminum salt of fatty acid, silicone treatment using silicone compounds such as dimethylsiloxane or methylhydrogensiloxane And a method of treating with a fluorine compound having a perfluoroalkyl group. From the viewpoint of stability, a silicone treatment method using a silicone compound such as dimethylsiloxane or methylhydrogensiloxane is preferred.

  The powder of component (D) can be used singly or in combination of two or more, and the content is 1 mass in the total composition from the viewpoint of UV protection effect, coloring, elongation, and dry feeling after use. % Or more, preferably 3% by weight or more, more preferably 5% by weight or more, more preferably 25% by weight or less, more preferably 20% by weight or less, and further preferably 15% by weight or less. Moreover, it is preferable to contain 1-25 mass% of components (D) in the whole composition, 3-20 mass% is more preferable, and it is still more preferable to contain 5-15 mass%.

  The content of water of component (E) is preferably 10% by mass or more, more preferably 30% by mass or more, and 50% by mass or more in the total composition from the viewpoint that the freshness on the skin is good. % By mass or more is more preferable, 95% by mass or less is preferable, 90% by mass or less is more preferable, and 82% by mass or less is more preferable. Moreover, it is preferable that 10-95 mass% is contained in the whole composition, 30-90 mass% is more preferable, and it is still more preferable that water is contained 50-82 mass%.

  In the oil-in-water emulsified cosmetic of the present invention, the mass ratio (A) / (D) of the components (A) and (D) does not feel squeaky, is easy to stretch, and is uniform on the skin. From a viewpoint which can apply | coat, 0.004-10 are preferable, 0.025-4 are more preferable, and 0.07-1 are still more preferable.

  The cosmetic of the present invention can further contain (F) ethylhexyl methoxycinnamate. Moreover, in order to improve stability at the time of containing a component (F), (G) nonionic surfactant and (H) higher alcohol can be contained.

  As the component (F), ethylhexyl methoxycinnamate, Ubinal MC80 manufactured by BASF Corporation can be used. The content is preferably 0.5% by mass or more, more preferably 1% by mass or more, further preferably 3% by mass or more, and 20% by mass or less from the viewpoint of non-stickiness, from the viewpoint of ultraviolet protection in the total composition. Is preferable, 15 mass% or less is more preferable, and 12 mass% or less is still more preferable. Moreover, it is preferable to contain 0.5-20 mass% of components (F) in the whole composition, 1-15 mass% is more preferable, and it is still more preferable to contain 3-12 mass%.

  The nonionic surfactant of the component (G) can further improve the emulsion stability, preferably HLB 10-20, more preferably HLB 12-18.

Here, HLB (hydrophilic-lipophilic balance <Hydrophilic-Lypophilic Balance>) indicates the molecular weight of the hydrophilic group portion in the total molecular weight of the surfactant. For nonionic surfactants, Griffin ( Griffin).
The HLB of the mixed surfactant composed of two or more kinds of nonionic surfactants is obtained as follows. The HLB of the mixed surfactant is obtained by averaging the HLB values of the nonionic surfactants based on the blending ratio.

Mixed HLB = Σ (HLBx × Wx) / ΣWx
HLBx indicates the HLB value of the nonionic surfactant X.
Wx indicates the weight (g) of the nonionic surfactant X having a value of HLBx.

Examples of the component (G) nonionic surfactant include sorbitan fatty acid ester, glycerin fatty acid ester, polyglycerin fatty acid ester, propylene glycol fatty acid ester, polyethylene glycol fatty acid ester, sucrose fatty acid ester, polyoxyethylene fatty acid ester, poly Oxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene propylene glycol fatty acid ester, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene Hardened castor oil fatty acid ester, polyoxyethylene phytostanol ether, polyoxyethylene phytosterol Ether, polyoxyethylene cholestanol ether, polyoxyethylene cholesteryl ether, polyoxyalkylene-modified organopolysiloxane, polyoxyalkylene-alkyl co-modified organopolysiloxanes, and the like.
Among these, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, and polyoxyethylene sorbitan fatty acid ester are preferable, and polyoxyethylene sorbitan fatty acid ester such as polyoxyethylene sorbitan monostearate is more preferable.

  Component (G) can be used singly or in combination of two or more. From the viewpoint of stability, the content is preferably 0.01% by mass or more and 0.1% by mass or more in the total composition. More preferably, 0.5 mass% or more is further preferable, 10 mass% or less is preferable, 8 mass% or less is more preferable, and 3 mass% or less is still more preferable. Moreover, it is preferable to contain 0.01-10 mass% of components (F) in the whole composition, 0.1-8 mass% is more preferable, and it is still more preferable to contain 0.5-3 mass%.

The higher alcohol of the component (H) is preferably a higher alcohol having 12 to 22 carbon atoms, more preferably a linear higher alcohol having 14 to 18 carbon atoms, and the emulsion stability can be further improved.
As the component (H), palmityl alcohol, stearyl alcohol, and behenyl alcohol are preferable, and stearyl alcohol is more preferable.

  Component (H) can be used singly or in combination of two or more. From the viewpoint of ease of use and ease of extension, the content is preferably 0.01% by mass or more in the total composition. 1 mass% or more is more preferable, 0.5 mass% or more is further preferable, 5 mass% or less is preferable, 3 mass% or less is more preferable, and 2 mass% or less is still more preferable. Moreover, it is preferable to contain 0.01-5 mass% of components (G) in the whole composition, 0.1-3 mass% is more preferable, and it is still more preferable to contain 0.5-2 mass%.

  The oil-in-water emulsified cosmetic of the present invention can contain other components used in ordinary cosmetics in addition to the above components. For example, oily components other than the above, nonionic surfactants other than the above, anionic surfactants, cationic surfactants, amphoteric surfactants, lower alcohols, humectants, water-soluble polymers, antioxidants, preservatives, Examples include chelating agents, whitening agents, ultraviolet absorbers, vitamins, various other medicinal ingredients, powders, fragrances, and coloring materials.

  The anionic surfactant, cationic surfactant, and amphoteric surfactant used in the oil-in-water emulsion cosmetic of the present invention can be used alone or in combination of two or more, and the content is 0.5 mass. % Or less is preferable, 0.1 mass% or less is more preferable, and it is still more preferable not to contain.

  In the oil-in-water emulsified cosmetic of the present invention, ethanol is preferred as the lower alcohol to be used because of a refreshing feeling and powder dispersibility. When ethanol is contained, the content is preferably 1% by mass or more, preferably 15% by mass or less, more preferably 12% by mass or less, and still more preferably 10% by mass or less.

  The humectant used in the oil-in-water emulsified cosmetic of the present invention can contain glycerin, 1,3-butylene glycol, sorbitol and the like. The content of the humectant is preferably 0.1 to 10% by mass, more preferably 0.5 to 8% by mass, and still more preferably 1 to 5% by mass in the entire composition.

  As the water-soluble polymer used in the oil-in-water emulsified cosmetic of the present invention, from the viewpoint of emulsion stability, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxyvinyl polymer, acrylic acid / alkyl methacrylate copolymer, xanthan gum Is preferred, and xanthan gum is more preferred. The content of the water-soluble polymer is preferably 0.005 to 1% by mass, more preferably 0.01 to 0.8% by mass, and still more preferably 0.05 to 0.5% by mass in the total composition.

The oil-in-water milk cosmetic of the present invention can be produced by an ordinary method. For example, the component (A) is added to the oil agent to swell, the powder component is further added, and the mixture is stirred. It can manufacture by emulsifying in addition to a phase.
For example, it can be applied as a skin cosmetic such as a foundation, a makeup base, a sunscreen cosmetic, a lotion, a cream, a milky lotion, a lotion, or a skin external preparation.

From the viewpoint of improving smoothness, the oil-in-water emulsified cosmetic of the present invention preferably has a viscosity at 25 ° C. of 5,000 to 100,000 mPa · s, more preferably 10,000 to 60000 mPa · s, and more preferably 20,000 to 40,000 mPa · s. Is more preferable. The viscosities were measured using a B8R viscometer (manufactured by Toki Sangyo Co., Ltd.) C, measured at 5 rpm, 1 minute, 25 ° C.
This invention discloses the following compositions further regarding embodiment mentioned above.

<1> The following components (A), (B), (C), (D) and (E):
(A) Crosslinked (meth) acrylic ester resin powder 0.1 to 10% by mass
(B) sodium acrylate / acryloyldimethyltaurine copolymer 0.05-2% by mass,
(C) 1-25% by mass of liquid oil at 25 ° C.
(D) Hydrophobic treated powder 1-25% by mass,
(E) An oil-in-water emulsified cosmetic containing water and having a mass ratio (A) / (D) of the component (A) to the component (D) of 0.004 to 10.

<2> Crosslinking formed by copolymerizing a monomer component containing at least one monomer selected from acrylic acid esters and methacrylic acid esters and a monomer having a carboxyl group (A) (A) The oil-in-water emulsified cosmetic according to <1>, which is a meth) acrylic ester resin powder.
<3> The oil-in-water emulsified cosmetic according to <2>, wherein the degree of neutralization of the carboxyl group is 1 to 30% in the crosslinked (meth) acrylate resin powder of the component (A).

<4> The oil-in-water emulsified cosmetic according to any one of <1> to <3>, wherein the crosslinked (meth) acrylic ester resin powder of the component (A) has an average particle diameter of 1 to 10 μm.
<5> The content of the component (A) is 0.1 to 10% by mass in the entire composition, preferably 0.5 to 8% by mass, and more preferably 1 to 5% by mass. <4> The oil-in-water emulsified cosmetic according to any one of the above.

<6> The content of component (B) is 0.05 to 2% by mass in the total composition, preferably 0.1 to 1.2% by mass, and more preferably 0.3 to 1% by mass. The oil-in-water emulsified cosmetic according to any one of <1> to <5>.
<7> The oil-in-water emulsion cosmetic according to any one of <1> to <6>, wherein the component (C) is one or two selected from dimethylpolysiloxane and dimethylcyclopolysiloxane.
<8> The content of the component (C) is 1 to 25% by mass in the total composition, preferably 5 to 22% by mass, and more preferably 10 to 20% by mass. The oil-in-water emulsified cosmetic according to any one of the above.

<9> Oil-in-water according to any one of <1> to <8>, wherein the hydrophobically treated powder of component (D) includes one or two selected from zinc oxide, titanium oxide, and a color pigment. Type emulsified cosmetic.
<10> The content of the component (D) is 1 to 25% by mass in the total composition, preferably 3 to 20% by mass, and more preferably 5 to 15% by mass. The oil-in-water emulsified cosmetic according to any one of the above.

<11> The oil-in-water emulsion cosmetic according to any one of <1> to <10>, further comprising (F) ethylhexyl methoxycinnamate.
<12> The content of the component (F) is 0.5 to 20% by mass in the entire composition, preferably 1 to 15% by mass, and more preferably 3 to 12% by mass. Oil emulsified cosmetic.

<13> The oil-in-water emulsified cosmetic according to any one of <1> to <12>, further comprising (G) a nonionic surfactant having an HLB of 10 to 20.
<14> The oil-in-water emulsified cosmetic according to <13>, wherein the component (G) is a polyoxyethylene sorbitan fatty acid ester.
<15> The content of component (G) is 0.01 to 10% by mass in the total composition, preferably 0.1 to 8% by mass, and more preferably 0.5 to 3% by mass <13 > Or <14> The oil-in-water emulsified cosmetic.

<16> The oil-in-water emulsified cosmetic according to any one of <1> to <15>, further comprising (H) a higher alcohol having 12 to 22 carbon atoms.
<17> The oil-in-water emulsion cosmetic according to <16>, wherein the component (H) is one or two selected from palmityl alcohol, stearyl alcohol, and behenyl alcohol.
<18> The content of the component (H) is 0.01 to 5% by mass in the entire composition, preferably 0.1 to 3% by mass, and more preferably 0.5 to 2% by mass. > Or <17> The oil-in-water emulsified cosmetic.

Production Example 1 (Production of crosslinked (meth) acrylic ester resin powder A)
A beaker was charged with 82 g of lauryl methacrylate, 3 g of methacrylic acid, 15 g of ethylene glycol dimethacrylate, and 2 g of lauroyl peroxide, and dissolved by mixing and stirring. To this, 400 g of ion-exchanged water in which 0.75 g of N-stearoyl-N-methyltaurine sodium (SMT) was dissolved was added and dispersed with a homomixer until the particle size became 2.2 μm. The dispersion was poured into a four-necked flask and purged with nitrogen for 30 minutes while stirring. The temperature inside the flask was heated to 80 ° C. with an oil bath. After reaching 80 ° C., polymerization was performed for 5 hours, and then cooled to room temperature. The dispersion liquid of the polymerized particles was lyophilized and the particles were collected to obtain a resin powder A.

Examples 1-9, Comparative Examples 1-3
Oil-in-water emulsified cosmetics having the compositions shown in Table 1 were produced and evaluated for lack of squeakiness, ease of stretching, feeling of close contact with the skin, smoothness and stability. The results are also shown in Table 1.

(Production method)
Components (B) and (D) were added to silicone oil and stirred to obtain an oil phase. Component (A) was added to component (E) and stirred to obtain an aqueous phase. The oil phase was added to the aqueous phase and stirred to obtain an oil-in-water emulsified cosmetic.
When components (E), (F) and (G) are added, oil components other than silicone oil and components (F) and (G) are mixed, heated to 90 ° C., and component (B) Was added. Next, after adding a powder component and stirring and cooling to room temperature, the silicone oil was added and the oil phase was obtained. On the other hand, components (A), (D) and other aqueous components were mixed and stirred at room temperature to obtain an aqueous phase. The oil phase was added to the aqueous phase and stirred to obtain an oil-in-water emulsion cosmetic.

(Evaluation method)
(1) No squeaky feeling:
Ten professional panelists performed sensory evaluation of the squeaky feeling when using each cosmetic, and indicated the following criteria.
A: Ten people evaluated that there was no squeaky feeling.
B: Seven to nine people evaluated that there was no squeaky feeling.
C: Four to six people evaluated that there was no squeaky feeling.
D: One to three persons evaluated that there was no squeaky feeling.
E: None evaluated that there was no squeaky feeling.

(2) Ease of extension:
Ten professional panelists performed sensory evaluation on the ease of extension when each cosmetic was used, and indicated the following criteria.
A: 10 people evaluated that it was easy to extend.
B: Seven to nine people evaluated it as easy to extend.
C: 4-6 persons evaluated that it was easy to extend.
D: 1 to 3 people evaluated it as easy to extend.
E: Nothing was evaluated as easy to extend.

(3) A feeling of close contact with the skin:
Ten professional panelists conducted sensory evaluation of the feeling of close contact with the skin when using each cosmetic, and indicated the following criteria.
A: Ten people evaluated that there was a feeling of adhesion.
B: Seven to nine people evaluated that there was a feeling of adhesion.
C: Four to six people evaluated that there was a close feeling.
D: 1 to 3 persons evaluated that there was a feeling of adhesion.
E: None was evaluated as having a close feeling.

(4) Smooth feeling:
A 10-year-old expert panelist sensory-evaluated the feeling of smoothness 3 hours after using each cosmetic, and indicated the following criteria.
A: It was evaluated that 10 people were free.
B: It was evaluated that 7 to 9 people were free-flowing.
C: It was evaluated that 4 to 6 people were free.
D: It was evaluated that 1 to 3 persons were free-flowing.
E: None were evaluated to be smooth.

(5) Stability:
Each oil-in-water emulsified cosmetic was filled in a 50 mL glass bottle and stored at 50 ° C. for 2 weeks. Thereafter, each cosmetic was taken out using a syringe, and the state of the emulsified particles was evaluated by observation with an optical microscope. The observation was made at a magnification of 100 times, and the evaluation was made from the size of the emulsified particles visible in the visual field.
A: Equivalent to immediately after manufacture. 100 μm or less B: More than 100 μm and 150 μm or less.
C: More than 150 μm and 200 μm or less.
D: More than 200 μm and 300 μm or less.
E: It is larger than 300 μm.

Example 10
An oil-in-water emulsified cosmetic composition having the following composition can be produced in the same manner as in Examples 1-9. The obtained oil-in-water emulsified cosmetic reduces the squeaky sensation when applied to the skin, is easy to stretch, and can be applied uniformly to the skin, so that it does not feel strange and looks natural. In addition, the smooth feel continues.

Example 10 (oil-in-water emulsified cosmetic)
(component)
(Crosslinked (meth) acrylic ester resin powder A (Production Example 1)
(Average particle size 2.2 μm) 2.0 (mass%)
Sodium acrylate / acryloyldimethyltaurate sodium copolymer /
Isohexadecane / Polysorbate 80 * 1 2.0
Methylcyclopolysiloxane 16.0
Ethylhexyl methoxycinnamate 8.0
Polyoxyethylene sorbitan monostearate 1.0
Stearyl alcohol 1.0
Silicone-treated zinc oxide * 2 7.0
2% dimethylsiloxane-treated red iron oxide 0.024
2% dimethylsiloxane-treated yellow iron oxide 0.07
Black iron oxide treated with 2% dimethylsiloxane 0.003
2% dimethylsiloxane treated titanium oxide 0.903
Glycerin 3.0
Ethanol 10.0
Purified water balance
Total 100
* 1: SIMULGEL EG (37.5%) manufactured by SEPPIC * 2: MZ-500 treated with 5% dimethylsiloxane, manufactured by Teika

Claims (7)

The following components (A), (B), (C), (D) and (E):
(A) Cross-linked (meth) acrylic which is a copolymer of monomer components containing a (meth) acrylic acid alkyl ester monomer having 4 to 18 carbon atoms in the alkyl group and a monomer having a carboxyl group 0.1 to 10% by mass of acid ester resin powder,
(B) sodium acrylate / acryloyldimethyltaurine copolymer 0.05-2% by mass,
(C) 1-25% by mass of liquid oil at 25 ° C.
(D) Hydrophobic treated powder 1-25% by mass,
(E) An oil-in-water emulsified cosmetic containing water and having a mass ratio (A) / (D) of the component (A) to the component (D) of 0.004 to 10. Crosslinking (meth) ester resin powder acrylate component (A), oil-in-water emulsified cosmetic composition of claim 1, wherein the degree of neutralization of the carboxyl groups is 1 to 30%. The oil-in-water emulsified cosmetic according to claim 1 or 2 , wherein the crosslinked (meth) acrylic ester resin powder of component (A) has an average particle size of 1 to 10 µm. The oil-in-water emulsified cosmetic according to any one of claims 1 to 3 , further comprising (F) ethylhexyl methoxycinnamate. Furthermore, the oil-in-water type emulsified cosmetics of any one of Claims 1-4 containing the nonionic surfactant of (G) HLB10-20. The oil-in-water emulsified cosmetic according to any one of claims 1 to 5 , further comprising (H) a higher alcohol having 12 to 22 carbon atoms. The oil-in-water emulsified cosmetic according to any one of claims 1 to 6 , wherein the powder of component (D) contains one or two selected from zinc oxide, titanium oxide and a color pigment.