Water-in-oil type emulsified solid cosmetic

Abstract

The purpose of the present invention is to provide a water-in-oil type emulsified solid cosmetic which has excellent emulsion stability in combination with a humectant and a powder, and which makes it possible to obtain filling suitability for forming a solid product. The water-in-oil type emulsified solid cosmetic according to the present invention is characterized by comprising: (A) a humectant; (B) a powder; (C) one or more nonionic surfactants selected from the group consisting of (C-1) a cetyl PEG / PPG-10 / 1 polydimethylsiloxane having an HLB of 4.0 or more and (C-2) a polyglycerol-6 polyricinoleate having an HLB of 4.0 or less; and (D) water, the mass ratio of the amount of the component (D) to the total amount of the component (A) being 1: 1-1: 4, and the proportion of the aqueous phase in the total amount of the cosmetic being 50% by mass or less.

Description

Technical Field

[0001] The present invention relates to a water-in-oil emulsified solid cosmetic that can be combined with a humectant and a powder to obtain a filling suitability for forming a solid product. Background Art

[0002] Water-in-oil emulsified cosmetics have excellent water resistance compared to oil-in-water emulsified cosmetics, and can efficiently incorporate emollient oils, oil-soluble pharmaceuticals, ultraviolet absorbers, etc., and can form cosmetics with a high skin care effect. However, for water-in-oil emulsified cosmetics, if a refreshing feeling in use is desired, it is necessary to increase the proportion of the internal aqueous phase (internal aqueous phase ratio) relative to the total amount of the cosmetic, and thus it becomes difficult to obtain emulsion stability. In addition, if the amount of the powder component incorporated increases, it usually results in a feeling of floating powder and a tendency for the gloss to deteriorate.

[0003] For example, in Patent Document 1, by incorporating one or more selected from highly pure glyceryl monooleate, glyceryl monoisostearate, polyoxyethylene glyceryl monostearate, an aqueous component, an oily component containing a volatile oil component, and a powder, a water-in-oil emulsified cosmetic having a high internal aqueous phase ratio of 50% or more or 60% or more relative to the total amount of the cosmetic can be achieved. In terms of the feeling in use, although a high amount of powder is incorporated, a cosmetic with a glossy feeling is also achieved.

[0004] However, in a water-in-oil emulsified cosmetic such as that in Patent Document 1, when it is desired to incorporate a high amount of a humectant to improve the moisturizing effect, from the viewpoint of stability, it is usually necessary to increase the total amount of water, and thus the internal aqueous phase ratio inevitably becomes further higher. When preparing a water-in-oil emulsified cosmetic with such a high internal aqueous phase ratio in a solid cosmetic, since the viscosity becomes high due to the high internal aqueous phase ratio, there is a tendency for the filling suitability to deteriorate.

[0005] In Patent Document 2, by incorporating a polyol, an oil phase thickener such as a crosslinked silicone elastomer, an emulsifier such as a polyether-modified silicone or an organically modified clay mineral, and water, a water-in-oil thermosensitive cosmetic with a small amount of water incorporated, a high amount of polyol incorporated, and having a certain degree of hardness (hardness measured with a rheometer at 11.3 mm Φ and 25 °C is 6 or more) is achieved.

[0006] However, when it is desired to incorporate a powder in the oil phase in a water-in-oil emulsified cosmetic with a high amount of a humectant incorporated as in Patent Document 2, the emulsion becomes unstable and it is difficult to obtain the filling suitability required for obtaining a solid product.

[0007] Therefore, there is a problem in preparing a solid water-in-oil emulsified cosmetic with a high amount of powder and a humectant incorporated.

[0008] Prior art documents

[0009] Patent documents

[0010] Patent document 1: Japanese Unexamined Patent Application Publication No. 2010-132621

[0011] Patent document 2: WO 2019 / 230578 Summary of the invention

[0012] Problems to be solved by the invention

[0013] An object of the present invention is to provide a water-in-oil emulsion solid cosmetic that contains a humectant and powder, has excellent emulsion stability, and can provide a filling suitability for forming a solid product.

[0014] The inventors repeatedly conducted in-depth studies to solve the above problems and found that: by using a specific cetyl PEG / PPG-10 / 1 dimethicone or a specific polyglyceryl-6 polyricinoleate as a nonionic surfactant, even when a humectant is incorporated, it is not necessary to incorporate a large amount of water to obtain stability, the internal water phase ratio can be suppressed low, and a solid cosmetic having excellent emulsion stability and filling suitability can be obtained in a water-in-oil emulsion cosmetic containing powder. Thus, the present invention has been completed.

[0015] That is, the present invention provides a water-in-oil emulsion solid cosmetic comprising:

[0016] (A) A humectant;

[0017] (B) Powder;

[0018] (C) One or more nonionic surfactants selected from the following:

[0019] (C-1) Cetyl PEG / PPG-10 / 1 dimethicone having an HLB of 4.0 or more,

[0020] (C-2) Polyglyceryl-6 polyricinoleate having an HLB of 4.0 or less; and,

[0021] (D) Water,

[0022] The mixing amount of the aforementioned (D) water and the total mixing amount of the aforementioned (A) components are in a mass ratio of 1:1 to 1:4,

[0023] The proportion of the aqueous phase in the total amount of the cosmetic is 50% or less by mass.

[0024] Effects of the invention

[0025] By forming the above configuration, the present invention enables a high concentration of the humectant, and a solid water-in-oil emulsion cosmetic can be obtained which contains powder and has a glossy finish in the finished state. Detailed Description of the Invention

[0026] The cosmetic of the present invention is characterized in that it contains: (A) a humectant, (B) a powder, (C) a specific nonionic surfactant, and (D) water. Hereinafter, each component constituting the water-in-oil emulsion solid cosmetic of the present invention will be described in detail.

[0027] <(A) Humectant>

[0028] The (A) humectant of the present invention (hereinafter, sometimes simply referred to as the "(A) component") is not particularly limited as long as it is a component usually formulated in cosmetics for obtaining a moisturizing effect on the skin. As specific examples, glycols such as propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, diethylene glycol, triethylene glycol, and polyethylene glycol; glycerols such as glycerin, diglycerol, and polyglycerol; sugar alcohols such as sorbitol, mannitol, maltitol, xylitol, and erythritol; and sugars such as fructose, glucose, galactose, maltose, lactose, and trehalose can be mentioned. Among them, those selected from propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerin, diglycerol, and polyglycerol are preferred.

[0029] As the (A) component of the present invention, one kind selected from the above substances can be used alone, or two or more kinds can be used in combination.

[0030] In the water-in-oil emulsion solid cosmetic of the present invention, in order to obtain filling suitability, the mixing ratio (mass ratio) of the mixing amount of (D) water mixed in the inner aqueous phase to the total mixing amount of the (A) component must be 1:1 to 1:4, and the proportion of the aqueous phase in the total amount of the cosmetic must be 50% or less by mass. Here, the "aqueous phase" means all the components constituting the inner aqueous phase in the water-in-oil emulsion cosmetic. When the mixing ratio of (D) water to the total mixing amount of the (A) component is not within the above range, or when the proportion of the aqueous phase in the total amount of the cosmetic exceeds 50% by mass, sufficient filling suitability cannot be obtained.

[0031] In addition, in the water-in-oil emulsion solid cosmetic of the present invention, from the viewpoint of further improving the glossiness, the mixing ratio (mass ratio) of the mixing amount of (D) water mixed in the inner aqueous phase to the total mixing amount of the (A) component is preferably 1:2 to 1:4, and more preferably 1:3 to 1:4.

[0032] (A) The blending amount is not limited as long as it satisfies the aforementioned blending ratio. As examples, for the lower limit value, it can be cited as 0.1% by mass or more, 1% by mass or more, 5% by mass or more, 8% by mass or more, 10% by mass or more, etc. with respect to the total amount of the cosmetic. For the upper limit value, it can be cited as 30% by mass or less, 25% by mass or less, 20% by mass or less, 18% by mass or less, etc. Thus, as the blending amount range, it can be cited as 0.1 - 30% by mass, 5 - 20% by mass, etc. From the viewpoint of obtaining a sufficient moisturizing effect, the blending amount range is preferably 5 - 30% by mass, for example.

[0033] <(B) Powder>

[0034] The (B) powder of the present invention (hereinafter, sometimes simply referred to as “(B) component”) is not particularly limited as long as it is a powder component that can be usually blended in cosmetics. The shape of the (B) powder is not particularly limited and can be any form such as spherical, plate-like, spray-like, rod-like, etc. As examples, inorganic powders, organic powders, etc. can be cited.

[0035] As inorganic powders, for example, inorganic powders such as silica, talc, kaolin, mica, zeolite, etc. can be cited; inorganic white pigments such as titanium dioxide, zinc oxide, etc.; inorganic red pigments such as iron oxide-based (iron oxide red); inorganic yellow pigments such as iron oxide yellow, yellow ocher, etc.; black pigments such as iron oxide black, carbon black, etc.; inorganic green pigments such as chromium oxide green, chromium hydroxide green, cobalt titanate oxide, etc.; inorganic blue pigments such as ultramarine, Prussian blue, etc.; pearl pigments such as mica coated with titanium dioxide, mica coated with colored titanium dioxide, bismuth oxychloride, glass flakes, fish scale foil, etc.; metal powder pigments such as aluminum powder, copper powder, etc.

[0036] As organic powders, for example, organic pigments such as Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 228, Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, and Blue No. 404 can be cited; organic pigments such as zircon, barium or aluminum lakes (Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230, Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Green No. 3, and Blue No. 1, etc.); organic powders such as polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polyurethane powder, polystyrene powder, polyalkyl acrylate powder, cellulose powder, silicone powder, etc.; resin powders such as copolymer resin powder of styrene and acrylic acid, crosslinked silicone powder, etc.

[0037] The surface of the (B) powder of the present invention may be hydrophilic or hydrophobic, but a powder having a hydrophobic surface is preferably used. In addition, for the powder surface, a hydrophobization treatment based on a surface treatment agent may also be carried out. Examples of the treatment include those using silicones such as hydrogenated polydimethylsiloxane, polydimethylsiloxane, and tetrahydrotetramethylcyclotetrasiloxane; those using silane compounds such as octyltriethoxysilane and hexyltrimethoxysilane; those using amino acids such as N-acylglutamic acid; those using fatty acids such as palmitic acid and stearic acid; those using metal soaps such as alkali metal salts or alkaline earth metal salts of the aforementioned fatty acids; those using fluorine treatments such as perfluoroalkyl phosphoric acid diethanolamine salts and perfluoroalkyltrimethoxysilanes. Among them, a hydrophobization treatment based on a surface treatment agent selected from polydimethylsiloxane, sodium bis(lauramidoglutamido)lysinate, and magnesium stearate is preferably carried out. However, it is not limited to these examples.

[0038] (B) The blending amount of the component is not particularly limited as long as it is a commonly blended amount in cosmetics. For example, as the lower limit value, 5% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, etc. relative to the total amount of the cosmetics can be cited, and as the upper limit value, 35% by mass or less, 30% by mass or less, etc. can be cited. As an example, it is 5 to 35% by mass, more preferably 10 to 30% by mass relative to the total amount of the cosmetics.

[0039] <(C) Specific nonionic surfactant>

[0040] The (C) specific nonionic surfactant of the present invention (hereinafter, sometimes simply referred to as the “(C) component”) is one or more selected from (C-1) cetyl PEG / PPG-10 / 1 dimethicone and (C-2) polyglyceryl-6 polyricinoleate.

[0041] The (C-1) cetyl PEG / PPG-10 / 1 dimethicone of the present invention refers to a silicone linear alkyl co-modified polyether-modified silicone in which a part of the methyl groups of polydimethylsiloxane is substituted with cetyl groups, containing ethylene oxide (about 10 moles) and propylene oxide (about 1 mole), and having an HLB value of 4.0 or more, and preferably having an HLB value of 4.5 to 5.5.

[0042] Commercially available products of (C-1) cetyl PEG / PPG-10 / 1 dimethicone include ABIL EM 180 (manufactured by Evonik Operations GmbH), ABIL EM 90 (manufactured by Evonik Operations GmbH), etc.

[0043] The (C-2) polyglyceryl-6 polyricinoleate of the present invention refers to an ester formed by a polymer of ricinoleic acid and polyglyceryl-6 having 8 hydroxyl groups, and the HLB value is 4.0 or less, preferably 2.5 to 3.5.

[0044] Examples of commercially available products of (C-2) polyglyceryl-6 polyricinoleate include SY-Glyster CRS-75 (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.).

[0045] The blending amount of the (C) component is preferably 1 to 10% by mass, more preferably 1.5 to 5% by mass, based on the total amount of the cosmetic. If the blending amount is less than 1% by mass, sufficient emulsion stability may not be obtained, and if it exceeds 10% by mass, there is a tendency for emulsion stability to decrease or usability to deteriorate.

[0046] The water-in-oil type emulsified solid cosmetic of the present invention is characterized in that although a large amount of (A) humectant is blended, the total amount of (D) water can be suppressed relatively low. Thus, the blending amount of (D) water in the cosmetic of the present invention can be set to 15% by mass or less, 14% by mass or less, 13% by mass or less, 12% by mass or less, 11% by mass or less, or 10% by mass or less, based on the total amount of the cosmetic. On the other hand, from the viewpoint of obtaining a finished state with a glossy feeling, the lower limit value is preferably set to 1% by mass or more or 2% by mass or more.

[0047] The (D) water blended in the cosmetic of the present invention is selected as needed from ion-exchanged water, purified water, tap water, natural water, etc.

[0048] In this specification, "packing suitability" means obtaining the hardness required to obtain a solid product with excellent emulsion stability and no fluidity.

[0049] The terms "solid" or "solid-like" used in this specification are interpreted in the meaning commonly used in the cosmetic field. For example, it can be defined as a form or state in which the whole composition does not show fluidity at a temperature of 50°C or lower and does not show obvious deformation under normal storage conditions.

[0050] As an example, the hardness of the cosmetic of the present invention measured at 25°C using a rheometer (1.5 mm Φ, 10 mm penetration) is 10 or more, preferably 20 or more.

[0051] In the cosmetics of the present invention, in addition to the above components, within the range that does not impair the object / effect of the present invention, other optional components commonly used in skin external preparations such as cosmetics and pharmaceuticals can be appropriately blended as needed. As other optional components, for example, polyhydric alcohols other than the aforementioned component (A), oils, ultraviolet absorbers, oil-phase thickeners, surfactants other than the aforementioned component (C), dispersants, lower alcohols, defoamers, chelating agents, pH regulators, antioxidants, food flavors, preservatives, bactericides, various medicaments, etc. can be cited. However, it is not limited to these examples.

[0052] As the oils that can be blended, the following can be cited: hydrocarbon oils such as mineral oil, hydrogenated polydecene, isocetane, isododecane, ozokerite, squalane, squalene, pristane, paraffin, isoparaffin, ceresin, petrolatum, hydrogenated polyisobutene, and olefin oligomers; ester oils such as pentaerythritol tetra(ethylhexanoate), cetyl ethylhexanoate, phytosterol / octyldodecyl lauroylglutamate, triisostearin, glycerin diisostearate, glycerol tri(ethylhexanoate), phytosterol / isostearyl / cetyl / stearyl / behenyl dimer dilinoleate, isopropyl palmitate, ethylhexyl palmitate, myristyl myristate, isopropyl myristate, tripropylene glycol dicitrate, diisopropyl sebacate, isodecyl neopentanoate, etc.; chain-like organosilicon oils such as polydimethylsiloxane, diphenylpolydimethylsiloxane, and hydrogenated polydimethylsiloxane; cyclic organosilicon oils such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; liquid oils such as linseed oil, camellia seed oil, macadamia nut oil, corn oil, mink oil, olive fruit oil, jojoba seed oil, avocado oil, Camellia oleifera Abel., castor oil, safflower oil, rapeseed oil, soybean oil, peanut oil, triglycerol, trioctanoin, and triisopalmitin; semi-solid oils such as petrolatum, pentaerythritol tetra(behenate / benzoate / ethylhexanoate), dipentaerythritol hexahydroxystearate, phytosterol macadamiate, dimer dilinoleate, macadamia nut oil polyglyceryl-6 behenate, dipentaerythritol tetrahydroxystearate / tetraisostearate, bis-diglycerol polyacyl adipate-2, etc.; solid oils such as polyolefin wax, microcrystalline wax, polyethylene wax, paraffin wax, and synthetic wax, etc. One or more than two of these can be used.

[0053] As compatible ultraviolet absorbers, oil-soluble and polar ultraviolet absorbers can be cited, such as octocrylene, oxybenzone, benzylidene malonate polysiloxane, polysiloxane-15, butyl methoxydibenzoylmethane, ethylhexyl triazone, diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, benzophenone-3, methylene bis-benzotriazolyl tetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate, ethylhexyl salicylate, terephthalylidene dicamphor sulfonic acid, cresyl triazone trisiloxane and other organic ultraviolet absorbers, and one or more than two kinds selected from these can be used.

[0054] As compatible oil-phase thickeners, organically modified clay minerals such as lithium magnesium silicate quaternium-18 bentonite can be cited; glycerol fatty acid esters such as glyceryl behenate / eicosadioate; amino acid gelling agents such as N-lauroyl-L-glutamic acid dibutylamide (dibutyl lauroyl glutamine) and polyamide-8; sucrose fatty acid esters such as sucrose tetrastearate triacetate and sucrose tetraisostearate, and one or more than two kinds selected from these can be used.

[0055] In the formulation of the cosmetic of the present invention, there is also a formulation that does not contain a crosslinked silicone elastomer as an oil-phase thickener.

[0056] As surfactants other than the aforementioned component (C), silicone-based surfactants such as polyether-modified silicone with an HLB of 8.0 or less, cationic surfactants such as distearyldimethylammonium chloride, and one or more than two kinds selected from these can be used.

[0057] The cosmetic of the present invention can be manufactured according to a conventional method. That is, the powder component and the oily component are mixed while heating as needed to obtain an oily component mixture in which the powder component is uniformly dispersed. The aqueous component mixture obtained by mixing and dissolving separately is added to the aforementioned oily component mixture, emulsified in a homogenizer or the like, and the obtained emulsion is filled into a container and slowly cooled. Thus, a water-in-oil type emulsified solid cosmetic can be obtained.

[0058] The cosmetic of the present invention is suitable for forms such as stick, paste, and forms filled in medium-sized containers and solidified.

[0059] In addition, the cosmetic of the present invention is suitable as a cosmetic for makeup such as foundation, eyeshadow, eyeliner, mascara, and blush, and is provided as a solid foundation. Specific Examples

[0061] Examples are listed below to further elaborate on the present invention, but the present invention is not limited by any of these. Unless otherwise specified, the blending amount is expressed as mass % relative to the system containing the component. Before specifically describing each example, the evaluation methods used are described.

[0062] 1. Evaluation of Emulsification State

[0063] Prepare the water-in-oil type emulsified solid cosmetics of each example, and visually observe the appearance just after emulsification. Evaluate the case where it has been uniformly emulsified as "OK", and the case where it has not been sufficiently emulsified as "NG".

[0064] 2. Evaluation of Use Feeling (Glossiness)

[0065] For each prepared cosmetic, a practical use test was conducted by 10 panel members. The use feeling (glossiness) after applying each sample to the skin was evaluated according to the following criteria. Note that the "-" mark indicates a case where the use feeling cannot be evaluated.

[0066] <Evaluation Criteria>

[0067] A+: 10 evaluators evaluate it as having glossiness.

[0068] A: 6 - 9 evaluators evaluate it as having glossiness.

[0069] B: 3 - 5 evaluators evaluate it as having glossiness.

[0070] C: 2 or fewer evaluators evaluate it as having glossiness.

[0071] (Example / Comparative Example)

[0072] Solid foundations with the compositions shown in Table 1 below were prepared according to conventional methods. For each prepared cosmetic, the emulsification state and use feeling were evaluated according to the aforementioned evaluation methods. The results are shown in the table together.

[0073] [Table 1]

[0074]

[0075] *1: Trade name "SC9450N" manufactured by Shin-Etsu Chemical Co., Ltd.

[0076] *2: Trade name "ABIL EM 180" (HLB = 5.0) manufactured by Evonik Operations GmbH *3: Trade name "SY-Glyster CRS-75" (HLB = 3.3) manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.

[0077] *4: Trade name "KF-6048" (HLB = 3.5), manufactured by Shin-Etsu Chemical Co., Ltd.

[0078] *5: Trade name "SC0938B", manufactured by Shin-Etsu Chemical Co., Ltd.

[0079] *6: Trade name "WOGEL-18DV", manufactured by Matsumoto Fine Chemical Co., Ltd.

[0080] The proportion of the aqueous phase of the cosmetics in the table in the total amount of the cosmetics is 20.62% by mass.

[0081] The surfactants incorporated in Comparative Examples 1 to 3 in the table are surfactants commonly used in the preparation of water-in-oil emulsified solid cosmetics. When these surfactants are used instead of the component (C) of the present invention (Comparative Examples 1 to 3), sufficient stable solid cosmetics cannot be obtained.

[0082] On the other hand, when the surfactant as the component (C) of the present application invention is used, it becomes a water-in-oil emulsified solid cosmetic having excellent emulsion stability and filling suitability. In addition, for the cosmetic of Example 3 in which the mixing ratio of (D) water to (A) humectant in the aqueous phase is 1:1.06, the number of panelists who evaluated it as having a glossiness is slightly small, but in the cosmetics of the present invention (Examples 1 to 4), although a total of 27% by mass of powder is incorporated, it still becomes a cosmetic capable of feeling a glossiness.

[0083] Solid foundations having the compositions shown in Table 2 below were prepared according to a conventional method. For each of the prepared cosmetics, the emulsion state and the usability were evaluated according to the aforementioned evaluation method. The results are shown in the table together.

[0084] [Table 2]

[0085]

[0086] Comparative Example 4 in the table is an example in which the mixing ratio of (A) humectant is high and the mixing ratio of (D) water to (A) humectant is 1:4.89. The cosmetic of Comparative Example 4 was not sufficiently emulsified. Comparative Example 5 is an example in which the mixing ratio of (D) water is high and the mixing ratio of (D) water to (A) humectant is 1:0.79. The cosmetic of Comparative Example 5 was emulsified, but sufficient glossiness was not obtained.

[0087] In addition, Comparative Example 6 is an example in which the proportion of the aqueous phase in the total amount of the cosmetics is 51.55% by mass. The cosmetic of Comparative Example 6 was not sufficiently emulsified.

Claims

1. An oil-in-water emulsified solid cosmetic, comprising: (A) A humectant; (B) A powder; (C) One or more nonionic surfactants selected from the following, (C-1) Cetyl PEG / PPG-10 / 1 dimethicone having an HLB of 4.0 or more, (C-2) Polyglycerol-6 polyricinoleate having an HLB of 4.0 or less; and, (D) Water, The mixing amount of the (D) water and the total mixing amount of the (A) component are in a mass ratio of 1:1 to 1:4, The proportion of the aqueous phase in the total amount of the cosmetic is 50% or less by mass.

2. The water-in-oil emulsified solid cosmetic according to claim 1, wherein, The total mixing amount of the (A) component is 0.1 to 30% by mass based on the total amount of the cosmetic.

3. The water-in-oil emulsion solid cosmetic according to claim 1, wherein, The total mixing amount of the (B) component is 5 to 35% by mass based on the total amount of the cosmetic.

4. The water-in-oil emulsion solid cosmetic according to claim 1, wherein, The mixing amount of the (D) component is 15% by mass or less.

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