Water-in-oil emulsion cosmetic

Abstract

To provide a water-in-oil emulsion cosmetic that is applied to the skin and gives an even and uniform, clear and glossy finish, and keeps the clear and glossy skin with a smooth and unpowdery finish even after a long time.SOLUTION: A water-in-oil emulsion cosmetic contains following components (A), (B) and (C): (A) hydrophobic iron oxide, (B) polyhydroxystearic acid, (C) silicone oil.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a water-in-oil emulsion cosmetic.

Background Art

[0002] Conventionally, cosmetics having excellent makeup durability and usability have been studied. For example, Patent Document 1 describes that a water-in-oil emulsion cosmetic containing a specific fluorine-modified silicone resin, a fluorine-modified silicone oil, octyl paramethoxycinnamate, iron oxide and / or titanium oxide has no film feeling, is difficult to form a makeup film, and its effect lasts.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, although conventional cosmetics are excellent in coloring power and durability, there is a problem that a glossy finish does not last for a long time. In addition, iron oxide in the cosmetic easily aggregates, and it is difficult to obtain a uniform finish without unevenness after application.

Means for Solving the Problems

[0005] The present inventors have found that by using polyhydroxystearic acid in combination with hydrophobic iron oxide and silicone oil, iron oxide in the cosmetic does not aggregate, and after application, a uniform, bright and glossy finish without unevenness can be obtained, and even after a long time, an oil-in-water emulsion cosmetic can be obtained in which the skin is bright, glossy, smooth and not powdery.

[0006] The present invention provides the following components (A), (B) and (C): (A) Hydrophobized iron oxide, (B) Polyhydroxystearic acid, (C) Silicone oil It relates to a water-in-oil emulsion cosmetic containing the same. In addition, the present invention relates to the following components (A) and (C): (A) Hydrophobized iron oxide, (C) Silicone oil It relates to a method for producing a water-in-oil emulsion cosmetic, characterized in that (B) polyhydroxystearic acid is blended into an oil phase containing the same, and then an aqueous phase is blended.

Effect of the Invention

[0007] The water-in-oil emulsion cosmetic of the present invention can adhere uniformly to skin grooves and skin mounds without aggregation of iron oxide in the cosmetic, and after application, a uniform, bright and shiny finish without unevenness can be obtained. Even after a long time, the skin remains bright and shiny, and the smooth and non-powdery finish persists.

Mode for Carrying Out the Invention

[0008] Component (A) used in the present invention is hydrophobized iron oxide. Examples of iron oxide include yellow iron oxide, black iron oxide, red iron oxide, etc., and it may be a composite powder with other powders. As iron oxide, it is preferable to contain one or more selected from yellow iron oxide, black iron oxide, and red iron oxide.

[0009] The hydrophobization treatment of iron oxide is not limited as long as it is a treatment applied to ordinary cosmetic powders. For example, surface treatment agents such as fluorine compounds, silicone-based compounds, metal soaps, amino acid-based compounds, lecithin, alkylsilanes, oil agents, and organic titanates can be used, and dry treatment, wet treatment, etc. can be performed. Specific examples of the surface treatment agent include fluorine-based compounds such as perfluoropolyether, perfluoroalkyl phosphate ester, perfluoroalkylalkoxysilane, and fluorine-modified silicone; silicone-based compounds such as dimethylpolysiloxane, methylhydrogenpolysiloxane, cyclic silicone, organopolysiloxane modified with a trialkoxy group at one or both ends, crosslinked silicone, silicone resin, fluorine-modified silicone resin, and acrylic-modified silicone; metal soaps such as aluminum stearate, aluminum myristate, zinc stearate, and magnesium stearate; amino acid-based compounds such as proline, hydroxyproline, alanine, glycine, sarcosine, glutamic acid, aspartic acid, lysine and their derivatives, and acylated amino acids; lecithin, hydrogenated lecithin; alkylsilanes such as methyltrimethoxysilane, ethyltrimethoxysilane, hexyltrimethoxysilane, octyltrimethoxysilane, octyltriethoxysilane, and caprylyl triethoxysilane; oil agents such as polyisobutylene, wax, fats and oils, and fatty acids; and organic titanates such as isopropyltriisostearoyl titanate, etc. Among these, from the viewpoint of dispersing component (A) in oil, treatment with dimethylpolysiloxane, methylhydrogenpolysiloxane, amino acid-based compounds, alkylsilanes, and organic titanates is preferred, treatment with dimethylpolysiloxane, methylhydrogenpolysiloxane, and alkylsilanes is more preferred, treatment with alkylsilanes is even more preferred, and treatment with caprylyl triethoxysilane is even more preferred.

[0010] The hydrophobization treatment can be carried out according to the usual method. From the viewpoint of dispersing component (A) in oil, the treatment amount of the hydrophobization treatment is preferably 0.1 to 15% by mass, more preferably 1 to 12% by mass, based on the amount of the coated powder.

[0011] Component (A) can be used singly or in combination of two or more. From the viewpoint of achieving a beautiful makeup effect on the skin, its content is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, still more preferably 0.5% by mass or more, even more preferably 1% by mass or more, preferably 10% by mass or less, more preferably 8% by mass or less, still more preferably 6% by mass or less, and even more preferably 4% by mass or less in the total composition. Also, the content of component (A) is preferably 0.01 - 10% by mass, more preferably 0.1 - 8% by mass, still more preferably 0.5 - 6% by mass, and even more preferably 1 - 4% by mass in the total composition.

[0012] The water-in-oil emulsion cosmetic of the present invention can further contain a hydrophobically treated powder other than component (A). Such powders are those commonly used in cosmetics, and include, for example, pearlescent pigments (pearl pigments), extender pigments, coloring pigments other than component (A), spherical powders, and the like.

[0013] Examples of pearlescent pigments include those in which the surfaces of plate-like powders such as mica, synthetic mica (synthetic fluorophlogopite), glass, silica (anhydrous silicic acid), and alumina are coated or encapsulated with colorants such as titanium oxide, iron oxide, silicon oxide, ultramarine blue, chromium oxide, tin oxide, chromium hydroxide, gold, silver, carmine, and organic pigments. Specifically, titanium oxide-coated mica, iron oxide-coated mica, iron oxide-coated mica titanium, chromium oxide-coated mica titanium, titanium oxide-coated glass powder, iron oxide-coated glass powder, iron oxide-encapsulated glass powder, etc. are included. Also, those obtained by cutting film webs such as polyethylene terephthalate·polymethyl methacrylate laminated powder, polyethylene terephthalate·aluminum vapor-deposited powder, polyethylene terephthalate·gold vapor-deposited laminated powder, etc. into arbitrary shapes can be used.

[0014] Examples of extender pigments include mica (such as muscovite, phlogopite, biotite, lepidolite mica), synthetic mica, talc, zinc oxide, plate-like titanium oxide, plate-like cerium oxide, barium sulfate, kaolin, sericite, silica, ceramic powder, alumina, boron nitride, glass powder, etc.

[0015] Examples of the coloring pigments other than the component (A) include metal oxides such as titanium oxide, zinc oxide, cerium oxide, aluminum oxide, ultramarine blue, ultramarine, chromium oxide, chromium hydroxide, etc.; metal complexes such as manganese violet, cobalt titanate, etc.; and further inorganic pigments such as carbon black; synthetic organic pigments, organic dyes and their lake pigments such as Red No. 3, Red No. 104, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 227, Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Orange No. 203, Orange No. 204, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 401, Blue No. 1, Blue No. 404, etc.; and natural organic dyes such as β-carotene, caramel, paprika pigment, etc.

[0016] Examples of the spherical powder include inorganic spherical powders such as silica, calcium silicate, magnesium silicate, etc.; and organic spherical powders such as polyamide resin, polyacrylate resin, polymethacrylate resin, polyurethane resin, silicone resin, polyethylene resin, polystyrene resin, cellulose-based resin, etc. In addition, the spherical shape in the spherical powder includes a true sphere, a substantially spherical shape, an ellipsoid of revolution, and even a spherical powder having irregularities on the surface. These powders can be used after being hydrophobized in the same manner as the component (A).

[0017] The hydrophobized powders other than the component (A) can be used alone or in combination of two or more. From the viewpoint of improving the covering power and the feeling of use, the content is preferably 5% by mass or more, more preferably 10% by mass or more, preferably 40% by mass or less, and more preferably 30% by mass or less in the total composition. Further, the content of the hydrophobized powders other than the component (A) is preferably 5 to 40% by mass, and more preferably 10 to 30% by mass in the total composition.

[0018] The polyhydroxystearic acid of component (B) used in the present invention is a polymer of hydroxystearic acid. The hydroxystearic acid polymer refers to a polymer in which a plurality of monomeric hydroxystearic acids are polymerized. Hydroxystearic acid has one hydroxyl group in the molecule, and the polymerization reaction of hydroxystearic acid is a reaction in which the hydroxyl group or carboxyl group in the hydroxystearic acid molecule is esterified with the carboxyl group or hydroxyl group in another hydroxystearic acid molecule, that is, an intermolecular esterification reaction. Examples of the hydroxystearic acid polymer include polymers of 12-hydroxystearic acid. The 12-hydroxystearic acid polymer preferably has an average degree of polymerization (average number of monomers) of 2 to 12. In the present invention, the average number of monomers refers to the average degree of polymerization of monomeric 12-hydroxystearic acid. From the viewpoint of obtaining a bright and glossy finish on the skin, the average degree of polymerization is preferably 2 to 12, more preferably 4 to 12. As component (B), for example, commercially available products such as Saracos HS-6C (manufactured by Nisshin Oillio Group) can be used.

[0019] One or more kinds of component (B) can be used, and the content is preferably 0.005% by mass or more, more preferably 0.007% by mass or more, further preferably 0.01% by mass or more, even more preferably 0.03% by mass or more, preferably 3% by mass or less, more preferably 1% by mass or less, further preferably 0.5% by mass or less, and even more preferably 0.4% by mass or less in the total composition from the viewpoint of uniformly adhering to skin grooves and skin bumps, suppressing unevenness after application, and obtaining a bright and glossy finish on the skin. Also, the content of component (B) is preferably 0.005 to 3% by mass, more preferably 0.007 to 1% by mass, further preferably 0.01 to 0.5% by mass, and even more preferably 0.03 to 0.4% by mass in the total composition.

[0020] In the present invention, the mass ratio (A) / (B) of component (A) to component (B) adheres uniformly to the skin grooves and skin mounds, suppresses unevenness after application, and provides a bright and glossy finish. From the perspective of maintaining a bright, glossy, smooth, and non-powdery finish even after a long time, it is preferably 1 or more, more preferably 2 or more, even more preferably 3 or more, still more preferably 4 or more, preferably 50 or less, more preferably 40 or less, even more preferably 35 or less, and still more preferably 28 or less. Also, the mass ratio (A) / (B) of component (A) to component (B) is preferably from 1 to 50, more preferably from 2 to 40, even more preferably from 3 to 35, and still more preferably from 4 to 28.

[0021] The silicone oil of component (C) used in the present invention is the one used in ordinary cosmetics, and may be either (C-1) volatile silicone oil or (C-2) non-volatile silicone oil, and those in a liquid state at 25°C are preferred. Being in a liquid state means having fluidity and includes those in a cream-like or paste-like state. Examples of the silicone oil of component (C) used in the present invention include modified silicone oils such as linear dimethylpolysiloxane, branched siloxane, cyclic dimethylsiloxane, phenyl-modified silicone, polyether-modified silicone, higher fatty acid ester-modified silicone, higher alkoxy-modified silicone, alkyl-modified silicone, fluorine-modified silicone, and crosslinked organopolysiloxane.

[0022] In (C-1) volatile silicone oil, "volatile" means having a flash point of 35 to 87°C. Examples of the volatile silicone oil include linear dimethylpolysiloxanes such as dimethylpolysiloxane (1 cs), dimethylpolysiloxane (1.5 cs), and dimethylpolysiloxane (2 cs); branched siloxanes such as ethyltrisiloxane, methyltrimethicone, and tetrakis(trimethylsilyl)silane; and cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane. Among these, from the viewpoint of excellent makeup durability and finish after application, dimethylpolysiloxane (2cs) is preferred.

[0023] In addition, examples of the (C-2) non-volatile silicone oil include dimethylpolysiloxane; modified silicone oils such as higher fatty acid ester-modified silicone and higher alkoxy-modified silicone. Among these, chain silicones are preferred, linear silicones are more preferred, and dimethylpolysiloxane is even more preferred. The viscosity of the non-volatile silicone oil at 25°C is preferably 5 mPa·s or more, more preferably 6 mPa·s or more, preferably 50,000 mPa·s or less, more preferably 10,000 mPa·s or less, and even more preferably 3,000 mPa·s or less. The dimethylpolysiloxane preferably contains at least dimethylpolysiloxane (6 mPa·s). The viscosity here is measured at 25°C using a B-type viscometer (TVB-10 type, manufactured by Toki Sangyo Co., Ltd., measurement conditions: rotor TM1 to TM4, 6 rpm, 1 minute). The measurement of viscosity from 30 to 1000 mPa·s is by TM1, from 1000 to 5000 mPa·s is by TM2, from 5000 to 20000 mPa·s is by TM3, and from 20000 to 100000 mPa·s is by TM4.

[0024] As the component (C), from the viewpoint of maintaining a bright, glossy, smooth, and non-powdery finish of the skin even after a long time, it preferably contains at least (C-2) non-volatile chain silicone, more preferably contains linear silicone, and even more preferably contains dimethylpolysiloxane.

[0025] In component (C), the mass ratio (C-2) / (C) of the non-volatile silicone oil (C-2) is preferably 0.05 or more, more preferably 0.06 or more, still more preferably 0.07 or more, even more preferably 0.08 or more, preferably 0.5 or less, more preferably 0.4 or less, still more preferably 0.3 or less, and even more preferably 0.2 or less, from the viewpoint of maintaining a bright, glossy, smooth, and non-powdery finish of the skin even after a long time. Also, in component (C), the mass ratio (C-2) / (C) of the non-volatile silicone oil (C-2) is preferably from 0.05 to 0.5, more preferably from 0.06 to 0.4, still more preferably from 0.07 to 0.3, and even more preferably from 0.08 to 0.2.

[0026] Component (C) can be used singly or in combination of two or more, and the content is preferably 10% by mass or more, more preferably 15% by mass or more, still more preferably 20% by mass or more, even more preferably 25% by mass or more, preferably 55% by mass or less, more preferably 50% by mass or less, still more preferably 45% by mass or less, and even more preferably 40% by mass or less in the total composition, from the viewpoint of maintaining a bright, glossy, smooth, and non-powdery finish of the skin even after a long time. Also, the content of component (C) is preferably from 10 to 55% by mass, more preferably from 15 to 50% by mass, still more preferably from 20 to 45% by mass, and even more preferably from 25 to 40% by mass in the total composition.

[0027] In the present invention, the mass ratio (A) / (B + C) of component (A) to the total amount of components (B) and (C) is preferably 0.005 or more, more preferably 0.01 or more, still more preferably 0.02 or more, preferably 1 or less, more preferably 0.5 or less, and still more preferably 0.1 or less, from the viewpoint of uniformly adhering to skin grooves and skin mounds, suppressing unevenness after application, obtaining a bright and glossy finish, and maintaining a bright, glossy, smooth, and non-powdery finish of the skin even after a long time. Also, the mass ratio (A) / (B + C) of component (A) to the total amount of components (B) and (C) is preferably from 0.005 to 1, more preferably from 0.01 to 0.5, and still more preferably from 0.02 to 0.1.

[0028] The water-in-oil type emulsified cosmetic of the present invention can further contain (D) a surfactant, and a stable emulsion can be obtained. As the surfactant of component (D), a nonionic surfactant is preferable. From the viewpoint of enhancing the dispersion and solubility in oil, the HLB value is preferably 1 or more and 7 or less, more preferably 2 or more and 6 or less. Here, HLB (Hydrophilic-Lipophilic Balance) indicates the molecular weight of the hydrophilic group portion in the total molecular weight of the surfactant, and is obtained by the Griffin formula. Further, when composed of two or more nonionic surfactants, the HLB of the mixed surfactant is obtained as follows. The HLB of the mixed surfactant is the weighted average sum of the HLB values of each nonionic surfactant based on its blending ratio. Mixed HLB = Σ(HLBx × Wx) / ΣWx HLBx indicates the HLB value of the nonionic surfactant X. Wx indicates the mass (g) of the nonionic surfactant X having the value of HLBx.

[0029] Examples of the nonionic surfactant as the component (D) include sorbitan fatty acid esters such as glycerin fatty acid ester, propylene glycol fatty acid ester, sorbitan monoisostearate, sorbitan monooleate, sorbitan sesquistearate, sorbitan sesquioleate; polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene hydrogenated castor oil fatty acid ester, polyethylene glycol fatty acid ester, alkyl glyceryl ether, alkyl polyglyceryl ether, polyoxyethylene alkyl ether, polyoxyethylene alkyl ether fatty acid ester, polyoxyethylene alkylamine; polyether-modified silicones such as poly(oxyethylene·oxypropylene)methylpolysiloxane copolymer, poly(oxyethylene·methylpolysiloxane) copolymer; alkyl-modified polyether-modified silicones, alkyl-chain covariant polyether-modified silicones; silicone surfactants such as dimethylsiloxane·methyl(undecyl glyceryl ether)siloxane copolymer, etc. Among these, from the viewpoint of suppressing unevenness after coating, it is preferable to contain at least one or two or more kinds selected from silicone surfactants, and it is more preferable to contain at least one or two or more kinds selected from polyether-modified silicones and dimethylsiloxane·methyl(undecyl glyceryl ether)siloxane copolymer.

[0030] As the nonionic surfactant of component (D), commercially available products can be used. For example, as sorbitan monoisostearate, Span 120 (HLB 4.7) (manufactured by Croda) etc.; as polyoxyethylene-methylpolysiloxane copolymer, KF-6015 (HLB 4.5), KF-6017 (HLB 4.5), KF-6028 (HLB 4) (above, manufactured by Shin-Etsu Chemical Co., Ltd.), SH3775M (HLB 5) (manufactured by Toray Dow Corning Co., Ltd.) etc.; as poly(oxyethylene-oxypropylene)methylpolysiloxane copolymer, KF-6012 (HLB 7) (manufactured by Shin-Etsu Chemical Co., Ltd.), DOWSIL BY 22-008 M (HLB 2), ES-5226 DM formulation Aid (HLB 2) (above, manufactured by Toray Dow Corning Co., Ltd.) etc.; as alkyl-modified polyether-modified silicone, KF-6038 (HLB 3) (manufactured by Shin-Etsu Chemical Co., Ltd.), ABIL EM 90 (HLB 5) (manufactured by Evonik) etc. can be mentioned. In addition, the dimethylsiloxane-methyl(undecylglyceryl ether)siloxane copolymer can be produced, for example, by the method described in JP-A-2015-107926.

[0031] Component (D) can be used alone or in combination of two or more, and the content is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, preferably 3% by mass or less, more preferably 2% by mass or less, and even more preferably 1% by mass or less in the total composition from the viewpoint of suppressing unevenness after coating. Further, the content of component (D) is preferably 0.01 to 3% by mass, more preferably 0.1 to 2% by mass, and even more preferably 0.1 to 1% by mass in the total composition.

[0032] In the water-in-oil type emulsified cosmetic of the present invention, the water content is preferably 10 to 50% by mass, more preferably 15 to 45% by mass, and even more preferably 20 to 40% by mass in the total composition from the viewpoint of excellent usability.

[0033] In addition to the above components, the water-in-oil emulsion cosmetic of the present invention can contain components commonly used in cosmetics, such as oil components other than those described above, powders other than those described above, water-soluble polymers, antioxidants, fragrances, pigments, preservatives, thickeners, pH adjusters, blood circulation promoters, cooling agents, antiperspirants, bactericides, skin activators, moisturizers, refreshing agents, and the like.

[0034] The water-in-oil emulsion cosmetic of the present invention can be produced according to a conventional method. For example, it can be produced by blending (B) polyhydroxystearic acid into the oil phase containing components (A) and (C), and then blending the aqueous phase. The water-in-oil emulsion cosmetic of the present invention can be made into dosage forms such as liquid, emulsion, paste, cream, gel, etc. In addition, the water-in-oil emulsion cosmetic of the present invention can be applied as a makeup base, foundation, concealer; makeup cosmetics such as blush, eyeshadow, mascara, eyeliner, eyebrow, overcoat agent, lipstick, etc.; sunscreen emulsions, sunscreen creams, and other UV protection cosmetics.

Examples

[0035] Examples 1 to 5 and Comparative Example 1 Water-in-oil emulsion cosmetics having the compositions shown in Table 1 were produced, and evaluated for a uniform finish without unevenness when applied to the skin, a bright and glossy finish immediately after application to the skin, the brightness and gloss of the skin 4 hours after application, and a smooth and non-powdery finish 4 hours after application. The results are shown together in Table 1.

[0036] (Manufacturing method) At 25°C, other powder components were added to the oil phase components containing components (A) and (C) and dispersed, then component (B) was added and uniformly mixed, and then the aqueous phase components were added and stirred at 3000 rpm for 1 minute with a homomixer to produce a water-in-oil emulsion cosmetic.

[0037] (Evaluation method) Five professional evaluators applied each cosmetic product to the skin and evaluated the even finish without unevenness, the bright and glossy finish immediately after application, the brightness and gloss of the skin 4 hours after application, and the smooth and non-powdery finish 4 hours after application according to the following criteria. The results were shown as the total scores of the five evaluators.

[0038] (1) Even finish without unevenness when applied to the skin: 5; Even finish without unevenness. 4; Fairly even finish without much unevenness. 3; Slightly uneven finish. 2; Uneven finish. 1; Quite uneven finish.

[0039] (2) Bright and glossy finish immediately after application to the skin: 5; The made-up skin looks bright and glossy. 4; The made-up skin looks slightly bright and glossy. 3; The made-up skin does not look very bright and glossy. 2; The made-up skin does not look bright and glossy. 1; The made-up skin does not look bright and glossy at all.

[0040] (3) Brightness and gloss of the skin 4 hours after application: 5; The made-up skin looks bright and glossy. 4; The made-up skin looks slightly bright and glossy. 3; The made-up skin does not look very bright and glossy. 2; The made-up skin does not look bright and glossy. 1; The made-up skin does not look bright and glossy at all.

[0041] (4) Smooth and non-powdery finish 4 hours after application: 5; Very smooth finish without feeling powdery. 4; Smooth finish with little feeling of powderyness. 3; Slightly powdery finish. 2; Powdery finish. 1; A finish that feels quite powdery.

[0042]

Table 1

Claims

1. The following components (A), (B), (C) and (D): (A) 0.5 to 6% by mass of iron oxide treated with alkylsilane (B) 0.01 to 1% by mass of polyhydroxystearic acid (C) 25 to 45% by mass of silicone oil containing at least (C-2) non-volatile chain silicone oil (D) 0.1 to 3% by mass of a nonionic surfactant containing one or more selected from silicone-based surfactants containing The mass ratio (C-2) / (C) of the (C-2) non-volatile chain silicone oil in component (C) is 0.06 to 0.2, Water-in-oil emulsion cosmetic.

2. The water-in-oil emulsion cosmetic according to claim 1, wherein the mass ratio (A) / (B) of component (A) to component (B) is 1 to 50.

3. The following components (A), (C) and (D): (A) 0.5 to 6% by mass of iron oxide treated with alkylsilane (C) 25 to 45% by mass of silicone oil containing at least (C-2) non-volatile chain silicone oil, and the mass ratio (C-2) / (C) of the (C-2) non-volatile chain silicone oil in component (C) is 0.06 to 0.2 (D) 0.1 to 3% by mass of a nonionic surfactant containing one or more selected from silicone-based surfactants A method for producing a water-in-oil emulsion cosmetic, characterized in that 0.01 to 1% by mass of (B) polyhydroxystearic acid is blended into an oil phase containing the above components, and then an aqueous phase is blended.

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