Oil-in-water emulsion cosmetic composition

Abstract

Provided is an oil-in-water type emulsion cosmetic composition which has a unique moist feel when used, while having excellent emulsion stability and high covering power. An oil-in-water emulsion cosmetic composition containing the following components (a) to (d): (a) pigment particles having an average particle diameter of 200 to 500 nm and having been surface-hydrophobically treated, (b) a water-soluble alkyl-substituted polysaccharide derivative, (c) polyhydroxystearic acid, and (d) an oil component containing a polar oil, in which the pigment particles are dispersed in the oil component, the content of pigment particles is 8.0 mass% to 15 mass%, and the content of a nonionic surfactant having an HLB value of 10 or more is 1.0 mass% or less.

Description

Technical Field

[0001] The present invention relates to an oil-in-water emulsified cosmetic composition. Background Art

[0002] Oil-in-water emulsified cosmetic compositions containing an aqueous phase as a continuous phase provide a moist and refreshing feel during use and are therefore widely used as base materials for makeup cosmetics such as foundations, primers, sunscreens, or base cosmetics such as lotions.

[0003] For example, Patent Document 1 discloses the following oil-in-water emulsified cosmetic composition: an oil-in-water cosmetic composed of an aqueous phase and an oil phase, containing a hydrophobized inorganic powder, a fatty acid soap, a nonionic surfactant, and a hydrophilic polymer, wherein the aqueous phase contains an aqueous medium, the oil phase contains an oil agent containing non-silicone oil, the hydrophobized inorganic powder contains at least a hydrophobized iron oxide powder and a hydrophobized pigment-grade titanium oxide powder, the same or different hydrophobized inorganic powders are present in the oil phase and the aqueous phase, and the hydrophobized pigment-grade titanium oxide powder is present in the oil phase and the aqueous phase. The contents in the oil phase and in the water phase are respectively more than 0.5% by mass and less than 5% by mass and more than 2.5% by mass and less than 20% by mass, based on the total amount of the oil-in-water cosmetic. The nonionic surfactant comprises one or more kinds, and the overall HLB value is 6 to 15. The hydrophilic polymer comprises a hydrophilic polymer comprising an ethylenically unsaturated compound having an aminoalkylsulfonic acid or a salt thereof as a substituent as a repeating unit. The total content of non-silicone oil is more than 5% by mass and less than 30% by mass, based on the total amount of the oil-in-water cosmetic.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application No. 2022-516239 Summary of the invention

[0007] Problems to be solved by the invention

[0008] Oil-in-water emulsified cosmetics such as oil-in-water foundations usually need to contain a large amount of pigment particles having a particle size of about 200 to 500 nm in order to cover unevenness of the skin and uneven color such as spots and freckles.

[0009] However, if the blending amount (content) of such a pigment particle component is large, there are problems such as poor emulsification stability of the cosmetic material and insufficient dispersibility of the pigment particles.

[0010] The present invention aims to improve the above situation and has an object to provide an oil-in-water emulsified cosmetic composition having a unique moist feel during use, excellent emulsification stability and high covering power.

[0011] Means for solving problems

[0012] The present invention for achieving the above-mentioned object is as follows.

[0013] <Scheme 1>

[0014] An oil-in-water emulsified cosmetic composition comprising the following components (a) to (d),

[0015] (a) Pigment particles having an average particle size of 200 to 500 nm and having a surface hydrophobic treatment,

[0016] (b) water-soluble alkyl-substituted polysaccharide derivatives,

[0017] (c) polyhydroxystearic acid, and

[0018] (d) oils containing polar oils,

[0019] The pigment particles are dispersed in the oil.

[0020] The content of the pigment particles is 8.0 mass % or more and 15 mass % or less, and

[0021] The content of the nonionic surfactant having an HLB value of 10 or more is 1.0 mass % or less.

[0022] <Scheme 2>

[0023] In the composition according to embodiment 1, the content of the polyhydroxystearic acid is 0.1 mass % to 1.5 mass %.

[0024] <Scheme 3>

[0025] In the composition according to embodiment 1 or 2, 50% by mass or more of the oil component is polar oil.

[0026] <Scheme 4>

[0027] The composition according to any one of aspects 1 to 3, wherein the water-soluble alkyl-substituted polysaccharide derivative is hydrophobically modified hydroxypropyl methylcellulose.

[0028] <Scheme 5>

[0029] The composition according to any one of aspects 1 to 4, wherein the content of the water-soluble alkyl-substituted polysaccharide derivative is 0.05% by mass or more and 1.0% by mass or less.

[0030] <Scheme 6>

[0031] The composition according to any one of aspects 1 to 5, further comprising an aqueous phase thickener.

[0032] <Scheme 7>

[0033] The composition according to any one of aspects 1 to 6, wherein the content of the oil component is 5.0% by mass or more and 40% by mass or less.

[0034] <Scheme 8>

[0035] The composition according to any one of aspects 1 to 7, wherein the polar oil contains a UV absorber.

[0036] <Scheme 9>

[0037] The composition according to any one of aspects 1 to 8, which is a color cosmetic composition.

[0038] <Scheme 10>

[0039] The composition according to any one of aspects 1 to 9, which is a foundation.

[0040] Effects of the Invention

[0041] According to the present invention, it is possible to provide an oil-in-water emulsified cosmetic composition which has a unique moist feeling during use, is excellent in emulsification stability, and has a high covering power.

[0042] In the present invention, the "unique moist feeling during use" means that when the cosmetic composition is applied to the skin with fingers or the like, the viscosity of the cosmetic composition decreases rapidly and collapses, and at the same time, a very moist feeling is given as it spreads over the skin. DETAILED DESCRIPTION

[0043] Hereinafter, embodiments of the present invention will be described in detail. It should be noted that the present invention is not limited to the following embodiments, and various modifications can be made within the scope of the spirit of the invention.

[0044] "Oil-in-water emulsified cosmetic composition"

[0045] The oil-in-water emulsified cosmetic composition of the present invention (hereinafter, also referred to as "the composition of the present invention") is an oil-in-water emulsified cosmetic composition.

[0046] It contains the following ingredients (a) to (d),

[0047] (a) Pigment particles having an average particle size of 200 to 500 nm and having a surface hydrophobic treatment,

[0048] (b) water-soluble alkyl-substituted polysaccharide derivatives,

[0049] (c) polyhydroxystearic acid, and

[0050] (d) oils containing polar oils,

[0051] Pigment particles are dispersed in oil.

[0052] The content of the pigment particles is 8.0 mass % or more and 15 mass % or less, and

[0053] The content of the nonionic surfactant having an HLB value of 10 or more is 1.0 mass % or less.

[0054] The composition of the present invention has a unique moist feel during use, is excellent in emulsification stability, and has high hiding power. Although not limited by theory, this is believed to be due to the unique structure of the composition of the present invention.

[0055] More specifically, the composition of the present invention has a high hiding power because it contains 8.0% by mass or more of component (a) (i.e., pigment particles having an average particle size of 200 to 500 nm and subjected to surface hydrophobic treatment). In addition, the composition of the present invention improves the dispersibility of component (a) in oil by containing component (c) (i.e., polyhydroxystearic acid) together with the above-mentioned component (a). Furthermore, the composition of the present invention has a unique moist feel in use by containing component (b) (i.e., a water-soluble alkyl-substituted polysaccharide derivative) and suppressing the content of a nonionic surfactant having an HLB value of 10 or more to 1.0% by mass or less. Furthermore, the water-soluble alkyl-substituted polysaccharide derivative has a relatively weaker stabilizing effect on emulsified particles than a nonionic surfactant having an HLB value of 10 or more. However, the emulsified particles obtained by the water-soluble alkyl-substituted polysaccharide derivative can contain a relatively large amount of component (a) in the emulsified particles due to its relatively large particle size, so the water-soluble alkyl-substituted polysaccharide derivative can improve the emulsification stability of the composition of the present invention.

[0056] It should be noted that in the composition of the present invention, the content of the nonionic surfactant having an HLB value of 10 or more can be, for example, more specifically, 1.0 mass % or less, 0.9 mass % or less, 0.8 mass % or less, 0.7 mass % or less, 0.6 mass % or less, 0.5 mass % or less, 0.4 mass % or less, 0.3 mass % or less, 0.2 mass % or less, 0.1 mass % or less, or 0 mass % (i.e., substantially not contained).

[0057] In addition, the composition of the present invention is not particularly limited, but can have an average emulsified particle size of 1 to 5 μm, preferably an average of 1 to 10 μm, and a maximum of about 20 μm. In the present invention, the emulsified particle size can be obtained by, for example, comprehensively judging the size of the emulsified particles (measured using a micrometer) and their distribution (uniformity of particles in the field of view of the microscope) with the naked eye using a microscope.

[0058] 〈(a) Pigment particles〉

[0059] The pigment particles contained in the composition of the present invention have an average particle diameter of 200 to 500 nm and are subjected to a surface hydrophobic treatment.

[0060] Since the average particle size of the pigment particles is 200 to 500 nm, it can cover uneven skin texture, spots, freckles and other color irregularities, especially with respect to visible light.

[0061] More specifically, the average particle size of the pigment particles according to the present invention may be, for example, 200 nm or more, 250 nm or more, or 300 nm or more, and may be 500 nm or less, 450 nm or less, 400 nm or less, or 350 nm or less.

[0062] It should be noted that, in the present invention, the "average particle size" refers to the average particle size of primary particles. In addition, the average particle size can be calculated as the projection area equivalent circle diameter of primary particles observed by SEM or TEM.

[0063] The type of pigment particles involved in the present invention is not particularly limited, and may be, for example, iron oxide or titanium oxide subjected to surface hydrophobic treatment. In addition, the iron oxide used as the pigment particles involved in the present invention may be, for example, iron oxide yellow, iron oxide red, or iron oxide black, and the color of the target composition may be adjusted by mixing these iron oxides of different colors.

[0064] In the present invention, the type of the hydrophobizing agent during the surface hydrophobizing treatment of pigment particles is not limited, and for example, fatty acid, higher fatty acid, higher alcohol, hydrocarbon, triglyceride, ester, silicone oil, silicone resin or fluorine compound etc. can be cited. More specifically, as the surface hydrophobizing agent used for iron oxide or titanium oxide, for example, silicone (especially, alkyl-modified silicone), alkyl triethoxy silane, alkyl trimethoxy silane, perfluoroalkyl phosphoric acid, (alkyl acrylate / dimethyl silicone) copolymer, dextrin palmitate, triethoxy silyl ethyl polydimethylsiloxyethyl hexyl polydimethylsiloxane, monomethyl polysiloxane, dimethyl polysiloxane, polymer silicone, sodium acryloyl dimethyl taurate / methacrylamide lauric acid copolymer etc. can be cited, but are not limited to these. In addition, from the viewpoint of improving powder dispersibility, for iron oxide, preferably silicone treatment, particularly alkyl-modified silicone treatment, for titanium oxide, preferably silicone treatment, alkyl trimethoxy silane treatment.

[0065] The shape of the pigment particles according to the present invention is not particularly limited, and examples thereof include spherical, plate-like, rod-like, spindle-like, needle-like, and irregular shapes.

[0066] In the composition of the present invention, the content of the pigment particles relative to the entire composition can be, for example, 8.0 mass % or more, 9.0 mass % or more, 10 mass % or more, 11 mass % or more, 12 mass % or more, 13 mass % or more, or 14 mass % or more, from the viewpoint of improving the hiding power of the composition. In addition, from the viewpoint of improving the emulsification stability and dispersibility of the pigment particles, it can be, for example, less than 15 mass %, less than 14 mass %, less than 13 mass %, less than 12 mass %, or less than 11 mass %.

[0067] In the composition of the present invention, the pigment particles are dispersed in the oil component. This means that when the composition of the present invention is applied to the skin, the effect of the present invention can be exerted even without redispersion by shaking or the like.

[0068] <(b) Water-soluble alkyl-substituted polysaccharide derivatives>

[0069] The water-soluble alkyl-substituted polysaccharide derivative contained in the composition of the present invention is not particularly limited, and examples thereof include hydrophobically modified alkyl cellulose, hydrophobically modified sulfonated polysaccharide derivatives, etc. It should be noted that in the present invention, the water-soluble alkyl-substituted polysaccharide derivative, particularly the hydrophobically modified alkyl cellulose, does not belong to the "nonionic surfactant having an HLB value of 10 or more", and is generally classified as a "polymer surfactant".

[0070] (Hydrophobic modified alkyl cellulose)

[0071] In the present invention, the hydrophobically modified alkyl cellulose refers to an alkyl cellulose hydrophobically modified by an alkyl group having 14 to 22 carbon atoms. The hydrophobically modified alkyl cellulose is a compound in which a long-chain alkyl group as a hydrophobic group is introduced into a water-soluble cellulose ether derivative, and is represented by the following general formula (I).

[0072]

[0073] [wherein, R may be the same or different and is selected from a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a group -[CH2CH(CH3)O] m -H (wherein m is 1 to 5, preferably an integer of 1 to 3), -CH2CH2OH, and -CH2CH(OH)CH2OR' (wherein R' is an alkyl group having 14 to 22 carbon atoms), but the group -CH2CH(OH)CH2OR' is always included. In addition, A is a group -(CH2) q -(q is an integer of 1 to 3, preferably 1), n ​​is an integer of 100 to 10000, preferably 500 to 5000.]

[0074] The method for producing the hydrophobically modified alkyl cellulose of the formula (I) can be generally performed by reacting a compound for introducing a long-chain alkyl group having 14 to 22 carbon atoms, specifically a long-chain alkyl glycidyl ether of the following formula (II), with a water-soluble cellulose ether derivative forming a group, specifically methyl cellulose (R is a hydrogen atom or a methyl group), ethyl cellulose (R is a hydrogen atom or an ethyl group), propyl cellulose (R is a hydrogen atom or a propyl group), butyl cellulose (R is a hydrogen atom or a butyl group), hydroxypropyl cellulose [R is a hydrogen atom or a hydroxypropyl group (group -[CH2CH(CH3)O] m -H (wherein m is 1 to 5, preferably an integer of 1 to 3))], hydroxypropylmethylcellulose (R is a hydrogen atom, a methyl group, or a hydroxypropyl group (same as above)) and the like.

[0075]

[0076] [In the formula, R' is an alkyl group having 14 to 22 carbon atoms.]

[0077] The content of the group -CH2CH(OH)CH2OR' introduced into the hydrophobically modified alkyl cellulose of the present invention is preferably about 0.1 to 5.0% by mass relative to the entire hydrophobically modified alkyl cellulose. In order to achieve such a content, the molar ratio, reaction time, type of alkali catalyst, etc. during the reaction of the above-mentioned water-soluble cellulose ester derivative and the long-chain alkyl glycidyl ether can be appropriately selected for production. After the above-mentioned reaction, the reaction product can also be subjected to purification steps such as neutralization / filtration / washing / drying / sieving.

[0078] It should be noted that among the above-mentioned water-soluble cellulose ether derivatives, hydroxypropyl methylcellulose is particularly suitable (thereby, R in formula (I) is a hydrogen atom, a methyl group, a radical -[CH2CH(CH3)O] m H, and any of the following four groups: -CH2CH(OH)CH2OR', q of the group A becomes 1, and the group A becomes a methylene group).

[0079] Furthermore, R' in the long-chain alkyl glycidyl ether of formula (II) is an alkyl group having 14 to 22 carbon atoms, preferably an alkyl group having 14 to 20 carbon atoms, and more preferably a stearyl group (-C 18 H 37 If the carbon number of the alkyl group R' is less than 14 or is 23 or more, the emulsification stability brought about by the obtained hydrophobically modified alkyl cellulose is insufficient.

[0080] The weight average molecular weight of the hydrophobically modified alkyl cellulose is preferably 100,000 to 1,000,000, more preferably 300,000 to 800,000, and further preferably 550,000 to 750,000.

[0081] In the present invention, as the hydrophobically modified alkyl cellulose, preferably hydrophobically modified hydroxypropyl methylcellulose (hydrophobized hydroxypropyl methylcellulose), more specifically, stearyloxy hydroxypropyl methylcellulose, stearyloxy hydroxypropyl cellulose or laureth-13PG hydroxyethyl cellulose. In addition, as the hydrophobically modified alkyl cellulose, commercially available products can also be used, for example, Sungerlos 90L (display name: hydrophobized hydroxypropyl methylcellulose; Datong Chemical Industry (strain) system), Natrosol Plus 330cs (Ashland society system), Polysurf 67cs (Ashland society system) etc. can be cited, but are not limited to these.

[0082] (Hydrophobic modified sulfonated polysaccharide derivatives)

[0083] In the present invention, the hydrophobic modified sulfonated polysaccharide derivative is preferably a substance having a polysaccharide or a derivative thereof in the basic skeleton, and a part or all of the hydrogen atoms of the hydroxyl group are substituted with the following substituents (a) and (b). The substituent (a) is preferably a glyceryl ether group having a hydrophobic portion selected from an alkyl glyceryl ether group having a straight or branched alkyl group having 10 to 40 carbon atoms and an alkenyl glyceryl ether group having a straight or branched alkenyl group having 10 to 40 carbon atoms. The substituent (b) is preferably a sulfoalkyl group having 1 to 5 carbon atoms or a salt thereof which can be substituted with a hydroxyl group. The so-called water-soluble herein means that it dissolves in water at 25°C by 0.001% by mass or more.

[0084] Specific examples of the substituent (a) include, but are not particularly limited to, 2-hydroxy-3-alkoxypropyl, 2-alkoxy-1-(hydroxymethyl)ethyl, 2-hydroxy-3-alkenyloxypropyl, and 2-alkenyloxy-1-(hydroxymethyl)ethyl. As the alkyl or alkenyl group having 10 to 40 carbon atoms substituted in these glyceryl ether groups, linear or branched alkyl and alkenyl groups having 12 to 36 carbon atoms, more preferably 16 to 24 carbon atoms, are preferred, among which alkyl groups are preferred, and linear alkyl groups are more preferred.

[0085] In addition, specific examples of the substituent (b) are not particularly limited, and include 2-sulfoethyl, 3-sulfopropyl, 3-sulfo-2-hydroxypropyl, 2-sulfo-1-(hydroxymethyl)ethyl, etc., all or part of which can form salts with alkali metals such as Na and K, alkaline earth metals such as Ca and Mg, organic cations such as amines, ammonium ions, etc.

[0086] The degree of substitution of the substituent (a) is preferably 0.001 to 1 per constituent monosaccharide residue, more preferably 0.002 to 0.5, and further preferably 0.003 to 0.1. The degree of substitution of the substituent (b) is preferably 0.01 to 2.5 per constituent monosaccharide residue, more preferably 0.02 to 2, and further preferably 0.1 to 1.5. In addition, the ratio of the number of substituents (a) to substituents (b) is preferably 1:1,000 to 100:1, more preferably 1:500 to 10:1, and further preferably 1:300 to 10:1.

[0087] The polysaccharide or its derivative which is the basic skeleton of the hydrophobic modified sulfonated polysaccharide derivative is not particularly limited, and examples thereof include cellulose, hydroxyethyl cellulose, methyl cellulose, ethyl cellulose, and hydroxypropyl cellulose. The weight average molecular weight of these polysaccharides or their derivatives is preferably 10,000 to 10,000,000, more preferably 100,000 to 5,000,000, and even more preferably 300,000 to 2,000,000.

[0088] In the present invention, specific examples of the hydrophobic modified sulfonated polysaccharide derivative include, but are not limited to, stearyl PG hydroxyethyl cellulose sulfonate. In addition, commercially available products may be used as the hydrophobic modified sulfonated polysaccharide derivative, and examples thereof include, but are not limited to, POIZ 310 (stearyl PG hydroxyethyl cellulose sulfonate; manufactured by Kao Corporation).

[0089] In the composition of the present invention, the content of the water-soluble alkyl-substituted polysaccharide derivative is not particularly limited, and can be, for example, 0.05% by mass or more, 0.10% by mass or more, 0.15% by mass or more, 0.20% by mass or more, 0.25% by mass or more, 0.30% by mass or more, 0.35% by mass or more, 0.40% by mass or more, 0.45% by mass or more, or 0.50% by mass or more, relative to the entire composition, and can also be 1.0% by mass or less, 0.80% by mass or less, 0.50% by mass or less, or 0.30% by mass or less.

[0090] 〈(c) Polyhydroxystearic acid〉

[0091] The polyhydroxystearic acid contained in the composition of the present invention has an effect of uniformly dispersing the pigment particles in the oil component.

[0092] Polyhydroxystearic acid is a compound oligomerized by forming an ester bond through hydroxystearic acid, and as commercially available products, for example, HS Oligomer 600 (manufactured by Toyokoku Oil Refining Co., Ltd.) and SARACOS HS-6C (manufactured by Nissin OILIO Co., Ltd.) are sold, and these can be used. In addition, the degree of polymerization of polyhydroxystearic acid is not particularly limited, and can be, for example, 4 to 8.

[0093] From the viewpoint of improving the dispersibility of the pigment particles in the oil component, in the composition of the present invention, the content of the polyhydroxystearic acid may be, for example, 0.1% by mass or more, 0.2% by mass or more, 0.3% by mass or more, 0.4% by mass or more, 0.5% by mass or more, 0.6% by mass or more, 0.7% by mass or more, 0.8% by mass or more, 0.9% by mass or more, or 1.0% by mass or more, relative to the entire composition, and from the viewpoint of improving the emulsion stability of the pigment particles, the content may be, for example, 1.5% by mass or less, 1.4% by mass or less, 1.3% by mass or less, 1.2% by mass or less, 1.1% by mass or less, or 1.0% by mass or less.

[0094] 〈(d) Oil content〉

[0095] The oil component contained in the composition of the present invention may be one or more selected from oily components generally used in cosmetics and the like.

[0096] In the composition of the present invention, the content of oil is not particularly limited, and may be, for example, 5.0% by mass or more, 6.0% by mass or more, 7.0% by mass or more, 8.0% by mass or more, 9.0% by mass or more, 10.0% by mass or more, 11.0% by mass or more, 12.0% by mass or more, 13.0% by mass or more, 14.0% by mass or more, 15.0% by mass or more, or 16.0% by mass or more; and may be 40.0% by mass or less, 30.0% by mass or less, or 20.0% by mass or less.

[0097] In the present invention, the oil component particularly preferably includes polar oil. For example, in the composition of the present invention, when 40% by mass or more, 44% by mass or more, preferably 50% by mass or more, more preferably 80% by mass or more, further preferably 85% by mass or more, further preferably 90% by mass or more, and particularly preferably 95% by mass or more of the oil component is polar oil, the emulsification stability can be further improved. In addition, the upper limit of the proportion of polar oil in the oil component is not particularly limited, for example, 100% by mass of the oil component can be polar oil, and more specifically, the polar oil can be less than 100% by mass of the oil component, less than 99% by mass, or less than 95% by mass. In addition, the composition of the present invention includes a large amount of polar oil compared to conventional cosmetics, so that high-polarity spices, etc. can also be stably mixed.

[0098] In addition, in the composition of the present invention, the content of the polar oil is not particularly limited, and for example, it can be 5.0 mass % or more, 6.0 mass % or more, 7.0 mass % or more, 8.0 mass % or more, 9.0 mass % or more, 10.0 mass % or more, 11.0 mass % or more, or 12.0 mass % or more, relative to the entire composition, and can also be 40.0 mass % or less, 30.0 mass % or less, 20.0 mass % or less, or 15.0 mass % or less.

[0099] It should be noted that in the present invention, the "polar oil" is not particularly limited as long as it is a highly polar oil generally used in cosmetics, and preferably, for example, an oil having a relative dielectric constant of about 5 or more, preferably about 10 or more is used.

[0100] Typical examples of polar oils include ester oils, ultraviolet absorbers, and polyol polymers.

[0101] (ester oil)

[0102] In the present invention, specific examples of the ester oil that can be used as the polar oil include tripropylene glycol dipivalate, isononyl isononanoate, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyl octanoate, cetyl lactate, myristyl lactate, acetylated wool. fat, isocetyl stearate, isocetyl isostearate, 12-hydroxystearate cholesterol, cetyl ethylhexanoate, glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, di-2-heptyl undecanoate glyceryl, trimethylol propane tri-2-ethylhexanoate, trimethylol propane triisostearate , pentaerythritol tetra-2-ethylhexanoate, triisooctanoin (tri-2-ethylhexanoin), trioctanoin, triisopalmitin, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, trimyristin, tri-2-heptylundecanoic acid glyceryl, castor oil fatty acid methyl ester, oleyl oleate, acetylated glyceryl, 2-heptylundecanoic acid, diisobutyl adipate, 2-octyldodecyl N-lauroyl-L-glutamate, di-2-heptylundecanoic acid, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate, but are not limited to these.

[0103] (Ultraviolet light absorber)

[0104] In the present invention, specific examples of ultraviolet absorbers that can be used as polar oils include benzoic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, dibenzoylmethane derivatives, β,β-diphenylacrylate derivatives, benzophenone derivatives, benzylidene camphor derivatives, phenylbenzimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, o-aminobenzoyl derivatives, imidazoline derivatives, benzylidene malonate derivatives, 4,4-diarylbutadiene derivatives, etc., but are not limited to these. In addition, some specific examples and trade names thereof are described below by way of example.

[0105] Examples of benzoic acid derivatives include, but are not limited to, ethyl p-aminobenzoate (PABA), ethyl dihydroxypropyl PABA, ethyl dimethyl PABA (e.g., "ESCAROL 507" manufactured by ISP), glyceryl PABA, PEG-25-PABA (e.g., "Yuvinal P25" manufactured by BASF), and diethylaminohydroxybenzoyl hexyl benzoate (e.g., "Yuvinal APLUS").

[0106] Examples of salicylic acid derivatives include homosalate ("Eusolex (Eusolex) HMS"; Eusolex) Manufactured by Toropan Co., Ltd.), ethylhexyl salicylate (for example, "NeoHeliopan OS"; NeoHeliopan OS)・Amen's レイマー Co., Ltd.), dipropylene glycol salicylate (for example, "Dipsal"; made by Sura Co., Ltd.), and TEA salicylate (for example, "ネオ・ヘリオパンTS"; manufactured by Hakuman・アンド・レイマー Co., Ltd.) etc., but are not limited to these.

[0107] Examples of cinnamic acid derivatives include ethylhexyl methoxycinnamate (e.g., "Parsol MCX"; manufactured by Hofman-Ra Rossi Co., Ltd.), isopropyl methoxycinnamate, isoamyl methoxycinnamate (e.g., "Neo Heliopan E1000"; manufactured by Harman And Raymer Co., Ltd.), cinoxate, DEA methoxycinnamate, diisopropyl methylcinnamate, glyceryl-ethylhexanoate-dimethoxycinnamate, and di-(2-ethylhexyl)-4'-methoxybenzylidenemalonate, but are not limited to these.

[0108] Examples of dibenzoylmethane derivatives include 4-tert-butyl-4′-methoxydibenzoylmethane (eg, “Parsol 1789”), but are not limited thereto.

[0109] Examples of the β,β-diphenylacrylate derivative include octocrylene (for example, "Yubinal N539" manufactured by BASF Corporation), but the derivative is not limited thereto.

[0110] Examples of benzophenone derivatives include benzophenone-1 (e.g., "Yuvinal 400"; manufactured by BASF), benzophenone-2 (e.g., "Yuvinal D50"; manufactured by BASF), benzophenone-3 or oxybenzone (e.g., "Yuvinal M40"; manufactured by BASF), benzophenone-4 (e.g., "Yuvinal MS40"; manufactured by BASF), benzophenone-5, Benzophenone-6 (for example, "Helisorb 11"; manufactured by Nolkuai Co., Ltd.), benzophenone-8 (for example, "Spectra-Sorb UV-24"; manufactured by American Silicon Mido Co., Ltd.), benzophenone-9 (for example, "Yubinal DS-49"; manufactured by BASF Co., Ltd.), and benzophenone-12, etc., but are not limited to these.

[0111] Examples of the benzylidene camphor derivatives include 3-benzylidene camphor (e.g., "Mexoryl SD"; manufactured by Siemex Corporation), 4-methylbenzylidene camphor, benzylidene camphor sulfonic acid (e.g., "Mexoryl SL"; manufactured by Siemex Corporation), benzalkonium methyl camphor sulfate (e.g., "Mexoryl SO"; manufactured by Siemex Corporation), terephthalylidene dicamphor sulfonic acid (e.g., "Mexoryl SX"; manufactured by Siemex Corporation), and polyacrylamide methylbenzylidene camphor (e.g., "Mexoryl SW"; manufactured by Siemex Corporation), but are not limited to these.

[0112] Examples of phenylbenzimidazole derivatives include phenylbenzimidazole sulfonic acid (e.g., "Usolex 232" manufactured by Melco), and disodium phenyldibenzimidazole tetrasulfonate (e.g., "Neo Heliopan AP" manufactured by Harman And Raymer Co., Ltd.), but are not limited thereto.

[0113] Examples of triazine derivatives include anise triazine (e.g., “Tinosorb S”; manufactured by Chiba Superior Chemicals Co., Ltd.), ethylhexyl triazone (e.g., “Uvinal T150”; manufactured by BASF), diethylhexyl butyramido triazone (e.g., “Uvasorb HEB”; manufactured by Sigamax 3V Co., Ltd.), and 2,4,6-tris(diisobutyl-4′-aminobenzylidenemalonate)-s-triazine, but the present invention is not limited thereto.

[0114] Examples of phenylbenzotriazole derivatives include drometrizole trisiloxane (e.g., “Silatrizole”; manufactured by Rollia Semiconductor Co., Ltd.), and methylenebis(benzotriazolyltetramethylbutylphenol) (e.g., “Chinosob M” (manufactured by Chiba Superior Chemicals Co., Ltd.)), but are not limited to these.

[0115] Examples of the anthranilyl derivative include menthyl anthranilate (for example, "Neo Heliopan MA" manufactured by Harman And Raymer Co., Ltd.), but the anthranilate derivative is not limited to these.

[0116] Examples of the imidazoline derivative include ethylhexyl dimethoxybenzylidene dioxoimidazolinium propionate, but the imidazoline derivative is not limited thereto.

[0117] Examples of the benzalmalonate derivative include polyorganosiloxane having a benzalmalonate functional group (for example, polysilicone-15; "Parsol SLX"; manufactured by DSM NanoSilicon Co., Ltd.), but the present invention is not limited to these.

[0118] Examples of the 4,4-diarylbutadiene derivative include 1,1-dicarboxy(2,2′-dimethylpropyl)-4,4-diphenylbutadiene, but the derivative is not limited thereto.

[0119] (Polyol polymer)

[0120] In the composition of the present invention, examples of the polyol polymer that can be used as the polar oil include, but are not limited to, diethylene glycol, dipropylene glycol, triethylene glycol, polypropylene glycol, tetraethylene glycol, diglycerol, polyethylene glycol, triglycerol, tetraglycerol, and polyglycerol. Among them, polypropylene glycol is more preferred from the viewpoint of compatibility.

[0121] (Oil except polar oil)

[0122] The composition of the present invention may further contain an oil component other than polar oil as the oil component. The oil component other than polar oil is not particularly limited, and examples thereof include hydrocarbon oil and silicone oil, but are not limited thereto.

[0123] Specific examples of hydrocarbon oils include, but are not limited to, decane, dodecane, isododecane, isohexadecane, undecane, tridecane, liquid paraffin, olefin oligomers, squalane, squalene, paraffin, and mixtures of two or more thereof.

[0124] In addition, specific examples of silicone oils include chain silicone oils such as polydimethylsiloxane (polydimethylsiloxane), methylphenylpolysiloxane, and methylhydrogenpolysiloxane, cyclic silicone oils such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane, and mixtures of two or more thereof, but are not limited to these.

[0125] It should be noted that in the composition of the present invention, the content of oil components other than polar oils (the total content when two or more oil components other than polar oils are included) is not particularly limited, and for example, it can be 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 2.0% by mass or more, 3.0% by mass or more, 4.0% by mass or more, or 5.0% by mass or more, and can be 15.0% by mass or less, 12.0% by mass or less, 10.0% by mass or less, or 8.0% by mass or less, relative to the entire composition.

[0126] 〈Other ingredients〉

[0127] The composition of the present invention may further contain other components in addition to the above-mentioned essential components (a) to (d) within a range not impairing the effects of the present invention.

[0128] (Aqueous phase thickener)

[0129] The composition of the present invention may further include an aqueous thickener. As the aqueous thickener, a thickener having the function of thickening the aqueous phase may be used, and in particular, a substance that reduces viscosity due to the presence of an electrolyte in a concentration range generally mixed in cosmetics. In addition, in the present invention, an aqueous thickener that reduces viscosity due to such an increase in electrolyte concentration is also referred to as a "aqueous thickener with low salt tolerance". Such a thickener with low salt tolerance is selected from water-soluble thickeners that have been mixed in cosmetics, etc. for the purpose of adjusting the viscosity of the aqueous phase.

[0130] Specific examples of the aqueous phase thickener include vinyl polymers such as polyvinyl alcohol, polyvinyl acetate, polyvinyl methyl ether, polyvinyl pyrrolidone, copolymers of vinyl pyrrolidone and vinyl acetate, and carboxyvinyl polymers; acrylic polymers such as sodium polyacrylate, polyethyl acrylate, polyacrylic acid alkanolamine, copolymers of alkyl methacrylate and dimethylaminoethyl methacrylate, poly-2-acrylamide-2-methylpropane sulfonic acid, polymethacryloyloxytrimethylammonium, (ammonium acryloyldimethyltaurate / VP) copolymers, and dimethylacrylamide / Na acryloyldimethyltaurate cross-linked polymers, but are not limited to these.

[0131] However, among the thickeners with low salt resistance, it is preferable to use a type of thickener that forms a water-swellable microgel in the aqueous phase and thickens by friction between the swollen microgel particles, as compared to a type of thickener that thickens by entanglement of polymer chains, because it can further suppress the stickiness when the cosmetic is blended with the skin. This is because the hydrophobically modified alkyl cellulose mixed as an emulsifier also has a thickening effect caused by the entanglement of polymer chains, so if a thickener of the type that thickens by the same mechanism is further mixed, the thickening effect may be promoted and become a cause of stickiness.

[0132] In the composition of the present invention, when the aqueous phase thickener is included, its content is not particularly limited, and may be, for example, 0.05% by mass or more, 0.10% by mass or more, 0.15% by mass or more, 0.20% by mass or more, or 0.25% by mass or more, and may be 3.0% by mass or less, 2.0% by mass or less, 1.0% by mass or less, or 0.5% by mass or less.

[0133] (Moisturizer)

[0134] The composition of the present invention may further contain a moisturizer. The moisturizer is not particularly limited, and examples thereof include polyols such as glycerin, 1,3-butylene glycol, dipropylene glycol, and propylene glycol; water-soluble polymers such as trehalose, hyaluronic acid, and chondroitin sulfate; or tocopherol.

[0135] In the composition of the present invention, when a moisturizing agent is contained, the content thereof is not particularly limited, and may be, for example, 0.5% by mass to 15% by mass, or 2.0% by mass to 12% by mass.

[0136] (Powder components other than pigment particles)

[0137] The composition of the present invention may further include a powder component other than the above-mentioned pigment particles. Examples of such powder components include, but are not limited to, extender pigments such as barium sulfate, talc, mica, kaolin, silicon dioxide, corn starch, and cellulose, and polymer powders such as polyethylene powder, polymethyl methacrylate powder, and nylon powder.

[0138] In the composition of the present invention, when such a powder component is contained, the content thereof is not particularly limited, and may be, for example, 0.1% by mass to 10% by mass, or 0.1% by mass to 3.0% by mass.

[0139] (Ionic surfactant)

[0140] The composition of the present invention may further contain an ionic surfactant. An ionic surfactant is preferred from the viewpoint of preventing the emulsified particles from agglomerating due to electrostatic repulsion.

[0141] The ionic surfactant is a surfactant that dissociates into ions when dissolved in water, and is specifically classified into anionic surfactants, cationic surfactants, amphoteric surfactants, and the like.

[0142] Examples of the ionic surfactant include anionic surfactants such as N-stearoyl-N-methyltaurine, sodium N-stearoyl-N-methyltaurate, disodium N-stearoyl-L-glutamate, sodium N-stearoyl-L-glutamate, sodium polyoxyethylene lauryl ether acetate, triethanolamine polyoxyethylene lauryl ether acetate, sodium laurate taurate, sodium lauroyl methyl taurate, and triethanolamine laurate; cationic surfactants such as stearyl dimethylamine oxide and stearyl trimethylammonium chloride; and amphoteric surfactants such as lauryl dimethyl betaine and lauryl dimethylaminoacetic acid betaine. The present invention is not limited to these.

[0143] In the composition of the present invention, when an ionic surfactant is contained, the content of the ionic surfactant may be, for example, 0.01 to 2.0% by mass, 0.05 to 1.0% by mass, or 0.10 to 0.50% by mass.

[0144] (Other surfactants)

[0145] The composition of the present invention may contain a nonionic surfactant having an HLB value of less than 10 as long as the condition that the content of the nonionic surfactant having an HLB value of 10 or more is less than 1.0 mass % is satisfied.

[0146] Examples of nonionic surfactants having an HLB value of less than 10 include, but are not limited to, bisbutyldimethicone polyglyceryl-3 (HLB value: 0.5), PEG-10 dimethicone (HLB value: 2.0), or PEG-9 polydimethylsiloxyethyl dimethicone (HLB value: 4.0).

[0147] In the composition of the present invention, when a nonionic surfactant having an HLB value of less than 10 is further contained, the content of the nonionic surfactant may be, for example, 0.01 to 2.0% by mass, or 0.05 to 1.0% by mass.

[0148] Furthermore, in addition to the above-mentioned surfactants, for example, polymer surfactants or natural surfactants may be further compounded in the composition of the present invention unless the effects of the present invention are impaired.

[0149] Furthermore, the composition of the present invention may be blended with, for example, antioxidants, alcohols, cosmetic ingredients, lecithin, glycolipids, plant extracts, preservatives, fragrances, pH adjusters, pigments, etc., within a range not impairing the effects of the present invention.

[0150] 《Preparation and Uses》

[0151] The composition of the present invention can be prepared by a method generally used in oil-in-water emulsified cosmetics, that is, by mixing the aqueous phase component and the oil phase component separately, and adding the oil phase component while stirring the aqueous phase component to emulsify the mixture.

[0152] The composition of the present invention has a unique moist feeling upon use, is excellent in emulsification stability, and has high covering power, and therefore can be used as a makeup cosmetic composition, particularly as a foundation.

[0153] Example

[0154] The present invention will be described in further detail below with reference to Examples, but the present invention is not limited thereto. It should be noted that, below, the content is expressed in mass % unless otherwise specified.

[0155] 《Examples and Comparative Examples》

[0156] The oil-in-water emulsified cosmetic compositions of Examples and Comparative Examples were prepared using the formulations shown in Tables 1 and 2 below. The emulsified particle size, feel during use, hiding power, and emulsion stability of the resulting compositions were evaluated according to the following criteria. The results are shown in Tables 1 and 2.

[0157] 〈Emulsified particle size〉

[0158] The size of the emulsified particles (measured using a micrometer) and their distribution (uniformity of particles in the field of view of the microscope) were comprehensively determined by naked eyes using a microscope to obtain the emulsified particle size of each composition obtained in the examples and comparative examples. It should be noted that in Table 1, the expression "1 to 10 (20)" means that the diameter of most emulsified particles is in the range of about 1 to 10 μm, and there are also a small number of emulsified particles up to about 20 μm. The same applies to other similar expressions.

[0159] 〈User experience〉

[0160] The compositions obtained in the examples and comparative examples were comprehensively evaluated by three professional panelists for the feel during use based on the following criteria:

[0161] "A": When the cosmetic is applied to the skin with fingers or the like, the viscosity suddenly decreases and the skin feels like it is collapsing, and at the same time, a very moist feeling is felt on the skin;

[0162] "B": When applying the cosmetic material to the skin with fingers or the like, there is a slight feeling of viscosity suddenly decreasing and collapsing, and at the same time, a moist feeling is felt spreading over the skin;

[0163] "C": When the cosmetic material is applied to the skin with fingers or the like, there is no feeling of a sudden decrease in viscosity and collapse, and the moist feeling when it spreads on the skin is also poor.

[0164] 〈Hiding power〉

[0165] The hiding power of each composition obtained in the examples and comparative examples was comprehensively evaluated by 10 professional panelists based on the following criteria:

[0166] "A": More than 7 out of 10 respondents said that the covering power is high;

[0167] "B": 4 to 6 out of 10 respondents said that the covering power was high;

[0168] “C”: Less than 3 people answered that the hiding power is high.

[0169] 〈Emulsion stability〉

[0170] The compositions obtained in the examples and comparative examples were subjected to a rolling test. More specifically, the rolling test was performed by filling a cylindrical container with a half-volume water-in-oil emulsified cosmetic composition as a sample, and rotating the sample at 45 rpm for 4 hours at room temperature using a rolling tester (made by Zhuochuan Physical and Chemical Industry Co., Ltd.), and observing the state change of the composition. After the observation, the evaluation was performed based on the following criteria:

[0171] “A”: no change was observed compared with immediately after modulation;

[0172] "B": Color fringes were slightly observed compared to just after modulation, but there was no problem in use;

[0173] "C": The oil layer and the water layer are separated, which creates an obstacle to use.

[0174] [Table 1]

[0175]

[0176] [Table 2]

[0177]

[0178] As is clear from Tables 1 and 2, the compositions of Examples 1 to 8 all have a unique moist feel during use, are excellent in emulsification stability, and have high hiding power. In particular, it is clear that the compositions of Examples 1, 2, and 7 obtained the best results in all evaluations.

[0179] In contrast, the compositions of Comparative Examples 1 to 3 had high hiding power but relatively poor moist feeling and poor emulsification stability. In addition, the composition of Comparative Example 4 containing no polar oil could not be emulsified and could not be a cosmetic composition, so it could not be measured.

[0180] Furthermore, a comparison between Example 7 and Example 8 clearly shows that Example 7, in which 50 mass % or more of the oil component is polar oil, obtains a more excellent result.

Claims

1. An oil-in-water emulsified cosmetic composition comprising the following components (a) to (d), (a) Pigment particles having an average particle size of 200 to 500 nm and having a surface hydrophobic treatment, (b) water-soluble alkyl-substituted polysaccharide derivatives, (c) polyhydroxystearic acid, and (d) oils containing polar oils, The pigment particles are dispersed in the oil. The content of the pigment particles is 8.0 mass % or more and 15 mass % or less, and The content of the nonionic surfactant having an HLB value of 10 or more is 1.0 mass % or less. 2 . The composition according to claim 1 , wherein the content of the polyhydroxystearic acid is 0.1% by mass or more and 1.5% by mass or less. 3 . The composition according to claim 1 , wherein 50% by mass or more of the oil component is polar oil.

4. The composition according to claim 1, wherein the water-soluble alkyl-substituted polysaccharide derivative is hydrophobically modified hydroxypropyl methylcellulose. 5 . The composition according to claim 1 , wherein the content of the water-soluble alkyl-substituted polysaccharide derivative is 0.05% by mass or more and 1.0% by mass or less. The composition according to claim 1 , further comprising a water phase thickener. The composition according to claim 1 , wherein the content of the oil component is 5.0% by mass or more and 40% by mass or less.

8. The composition of claim 1, wherein the polar oil comprises a UV absorber. 9 . The composition according to claim 1 , which is a makeup cosmetic composition.

10. The composition according to any one of claims 1 to 8, which is a foundation.

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