Oil-based solid cosmetic

Abstract

To provide an oil-based solid cosmetic that exhibits superior skin spreadability, maintains a natural finish, and produces a shiny look without a powdery feel.SOLUTION: An oil-based solid cosmetic contains following components (A) and (B): (A) titanium oxide 4-25 mass% and (B) wax that is solid at 25°C. The component (A) includes (A1) silicone-treated (non-amino acid-treated) titanium oxide with a particle size of less than 0.1 μm, (A2a) amino acid-treated titanium oxide with a particle size of 0.1 μm or more and less than 0.5 μm, and (A2b) amino acid-treated titanium oxide with a particle size of 0.5 μm or more, with (A2a) / (A2b)=0.2-3.5.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oily solid cosmetic preparation. [Background technology]

[0002] Titanium dioxide has excellent hiding power and is widely used in makeup cosmetics to adjust skin tone and conceal skin tone problems. Titanium dioxide's hiding power and finish vary depending on its particle size and shape, and cosmetics that provide sufficient coverage and a natural finish are being investigated. For example, Patent Document 1 describes that an oil-based solid cosmetic containing titanium oxide, characterized in that 90% by mass or more of the titanium oxide is (a1) large-particle titanium oxide having a primary particle diameter of 0.5 μm or more and (a2) fine-particle titanium oxide having a primary particle diameter of less than 0.1 μm, can provide sufficient covering effect and a natural finish even with a low content of pigment-grade titanium oxide. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-126956 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional oil-based solid cosmetics can produce a natural finish, but they have issues with powdery finish and difficulty in spreading.

[0005] The present inventors have found that there is a problem in the balance between the surface treatment agent for fine particle titanium dioxide and titanium dioxide of different particle sizes, and have discovered that by combining titanium dioxide of a specific surface treatment and particle size in a specific ratio, it is possible to obtain an oil-based solid cosmetic that spreads well on the skin, maintains a natural finish, is not powdery, and has a glossy finish.

[0006] The present invention comprises the following components (A) and (B): (A) titanium oxide 4 to 25 mass% (B) Solid wax at 25°C and as component (A), (A1) Silicone-treated (non-amino acid-treated) titanium oxide having a particle size of less than 0.1 μm; (A2a) Amino acid-treated titanium oxide having a particle size of 0.1 to less than 0.5 μm; (A2b) Contains amino acid-treated titanium oxide having a particle size of 0.5 μm or more, (A2a) / (A2b) = 0.2 to 3.5 This relates to oily solid cosmetics. [Effects of the Invention]

[0007] The oily solid cosmetic of the present invention has excellent spreadability on the skin, and provides a glossy finish without powdery feeling while maintaining a natural finish. Here, the glossy finish means a three-dimensional appearance. DETAILED DESCRIPTION OF THE INVENTION

[0008] The titanium oxide of component (A) of the present invention is (A1) Silicone-treated (non-amino acid-treated) titanium oxide having a particle size of less than 0.1 μm; (A2a) Amino acid-treated titanium oxide having a particle size of 0.1 μm or more and less than 0.5 μm; (A2b) It contains amino acid-treated titanium oxide having a particle size of 0.5 μm or more. In the present invention, particle size can be measured by image analysis. In particular, the "particle size" value is the equivalent circular diameter, which can be obtained, for example, by image analysis of a scanning electron microscope (SEM) photograph of 1,000 or more titanium oxide particles observed at 1,000x magnification by secondary electron detection using the SEM. The "equivalent circular diameter" of each titanium oxide particle is the diameter of a circle having an area equal to the area (projected area) of the titanium oxide particle in the image.

[0009] The titanium oxide of component (A1) has a particle size of less than 0.1 μm, preferably 0.01 to 0.09 μm. Component (A1) is such titanium oxide that has been treated with silicone, for example, a silicone-based compound such as dimethicone, methylhydrogenpolysiloxane, cyclic silicone, organopolysiloxane modified with trialkoxy groups at one or both ends, crosslinked silicone, silicone resin, or acrylic-modified silicone, which has been surface-treated by a conventional method. It is sufficient for the powder to be at least silicone-treated, and it may also be surface-treated with a compound other than a silicone-based compound. The silicone-treated powder may be treated with a combination of a silicone compound and a hydrophobic non-silicone compound other than amino acids. Examples of hydrophobic non-silicone compound treatments include surface treatments such as alkyl treatment, alkylsilane treatment, metal soap treatment, water-soluble polymer treatment, lecithin treatment, organic titanate treatment, polyol treatment, acrylic resin treatment, methacrylic resin treatment, and urethane resin treatment, and one or more of these can be used in combination. Note that the silicone-treated powder is preferably a powder that has not been treated with a hydrophobic non-silicone compound, and is preferably a silicone-treated powder that has been treated only with a silicone compound. As the silicone treatment, dimethicone treatment is preferred.

[0010] The content of component (A1) is preferably 1 to 6 mass % of the total composition, more preferably 1.5 to 5 mass %, from the viewpoints of excellent spreadability on the skin, maintaining a natural finish, and suppressing powdery feeling.

[0011] The titanium oxide of component (A2a) has a particle size of 0.1 μm or more and less than 0.5 μm, preferably 0.15 to 0.45 μm. Examples of titanium oxide of component (A2a) include JR-701, MP-701 (manufactured by Teika Co., Ltd.), and MPY-18 (manufactured by Titanium Kogyo Co., Ltd.). The component (A2a) is such titanium oxide treated with an amino acid, and includes treatment with an acylated amino acid. Examples of amino acids that can be used to treat titanium oxide include proline, hydroxyproline, alanine, glycine, sarcosine, lysine, aspartic acid, and glutamic acid, as well as salts thereof. The fatty acid that constitutes the acyl group of the acylated amino acid is preferably a fatty acid having 1 to 23 carbon atoms, more preferably a fatty acid having 8 to 20 carbon atoms, and even more preferably stearoyl glutamic acid, lauroyl aspartic acid, dilauroyl glutamic acid lysine, and lauroyl lysine. Examples of salts of these include Na, Ca, Al, Mg, Zn, Zr, and Ti salts. Specifically, those treated with stearoyl glutamate disodium, lauroyl aspartate sodium, etc. are preferred.

[0012] The content of component (A2a) is preferably 2 to 13 mass %, more preferably 3 to 12 mass %, of the total composition, from the viewpoints of suppressing powdery feeling while maintaining covering power and a natural finish.

[0013] The titanium oxide of component (A2b) has a particle size of 0.5 μm or more, preferably 0.6 to 3 μm. Examples of titanium oxide of component (A2b) include MP-100 (manufactured by Teika Co., Ltd.) and ST-750 (manufactured by Titanium Kogyo Co., Ltd.). Component (A2b), like component (A2a), is obtained by treating such titanium oxide with an amino acid, and also includes acylated amino acid treatment. The amino acid treatment and acylated amino acid treatment are the same as those for component (A2a). The content of component (A2b) is preferably 1 to 12 mass %, more preferably 1.5 to 11 mass %, of the total composition, from the viewpoint of maintaining a natural finish while suppressing powdery feeling.

[0014] Component (A2a) and component (A2b) may be treated with a hydrophobic compound in addition to an amino acid or an acylated amino acid, but are preferably not treated with silicone and are preferably treated only with an amino acid or an acylated amino acid. The amino acid or acylated amino acid treatment of component (A2a) and component (A2b) may be the same or different. Furthermore, from the viewpoints of achieving excellent spreadability on the skin, maintaining a natural finish while suppressing powdery feeling and achieving a glossy finish, the ratio (A2a) / (A2b) of component (A2a) and component (A2b) is 0.2 to 3.5, preferably 0.3 to 3.5, and more preferably 0.4 to 3.4. In the present invention, the total amount of component (A2a) and component (A2b) is referred to as component (A2).

[0015] One or more types of component (A) can be used, and from the viewpoint of obtaining a natural finish while maintaining covering power, the content is preferably 4% by mass or more of the total composition, more preferably 6% by mass or more, even more preferably 8% by mass or more, and preferably 25% by mass or less, more preferably 24% by mass or less, and even more preferably 23% by mass or less. The content of component (A) is preferably 4 to 25% by mass of the total composition, more preferably 6 to 24% by mass, and even more preferably 8 to 23% by mass.

[0016] Component (B) is a wax that is solid at 25° C. "Solid at 25° C." means that it exhibits solid properties at 25° C. and has a melting point of 40° C. or higher. The wax that is solid at 25°C is not limited as long as it is one that is commonly used in cosmetics, and examples thereof include mineral waxes such as ozokerite and ceresin; petroleum waxes such as paraffin and microcrystalline wax; synthetic hydrocarbons such as Fischer-Tropsch wax, polyethylene wax, and synthetic wax; vegetable waxes such as carnauba wax, candelilla wax, rice wax, Japan wax, sunflower wax, and hydrogenated jojoba oil; animal waxes such as beeswax and whale wax; and synthetic waxes such as silicone wax and synthetic beeswax. Of these, from the viewpoint of excellent shape retention and excellent spreadability on the skin, it is preferable to contain a hydrocarbon wax, and it is more preferable to contain at least one or more selected from paraffin, microcrystalline wax, hydrogenated microcrystalline wax, polyethylene, and (ethylene / propylene) copolymer mixtures.

[0017] One or more types of component (B) can be used, and from the viewpoint of excellent shape retention and excellent spreadability on the skin, the content is preferably 3% by mass or more of the total composition, more preferably 4% by mass or more, even more preferably 6% by mass or more, and preferably 20% by mass or less, more preferably 18% by mass or less, and even more preferably 14% by mass or less. The content of component (B) is preferably 3 to 20% by mass of the total composition, more preferably 4 to 18% by mass, and even more preferably 6 to 14% by mass.

[0018] In the present invention, the mass ratio of the integrated value of components (A1) and (A2) to component (B), [(A1) + (A2)] / (B), is preferably 1 or more, more preferably 1.1 or more, even more preferably 1.2 or more, and preferably 3 or less, more preferably 2.8 or less, and even more preferably 2.6 or less, from the viewpoints of achieving excellent spreadability on the skin, maintaining a natural finish, suppressing powdery feeling, and achieving a glossy finish. Furthermore, the mass ratio of the integrated value of components (A1) and (A2) to component (B), [(A1) + (A2)] / (B), is preferably 1 to 3, more preferably 1.1 to 2.8, and even more preferably 1.2 to 2.6.

[0019] The oily solid cosmetic preparation of the present invention may further contain an oil component that is liquid at 25° C. An oil component that is liquid at 25° C. is an oil component that has fluidity at 25° C., and also includes a paste-like oil component as long as it has fluidity. The oil component that is liquid at 25°C may be any oil that is commonly used in cosmetics, and examples thereof include hydrocarbon oils, alcohols, ester oils, ether oils, and silicone oils, such as linear or branched hydrocarbon oils such as liquid paraffin, light isoparaffin, liquid isoparaffin, mineral oil, polybutene, polyisobutene, hydrogenated polyisobutene, hydrogenated polydecene, squalane, and squalene; vegetable oils such as avocado oil, macadamia nut oil, olive oil, rapeseed oil, sesame oil, wheat germ oil, linseed oil, cottonseed oil, soybean oil, palm oil, coconut oil, castor oil, jojoba oil, sunflower oil, camellia oil, and corn oil; and animal oils such as liquid lanolin.Isopropyl myristate, octyldodecyl myristate, isopropyl isostearate, isononyl isononanoate, butyl stearate, oleyl oleate, isotridecyl isononanoate, isostearyl myristate, octyldodecyl ricinoleate, octyl hydroxystearate, diglyceryl monoisostearate, ethylhexyl palmitate, cetyl ethylhexanoate, octyl methoxycinnamate, tocopheryl acetate, propylene carbonate, diisostearyl malate, propylene glycol dicaprylate, dicaprin Neopentyl glycol diethylhexanoate, diglyceryl diisostearate, propanediol diisostearate, glyceryl monomyristate monoisostearate, glyceryl diisostearate, polyglyceryl diisostearate, glyceryl triisostearate, propanediol dicaprate / caprylate, glyceryl tricaprylate / caprate, glyceryl tri-2-ethylhexanoate, triethylhexanoin, trimethylolpropane tri-2-ethylhexanoate, triisostearyl alcohol Trimethylolpropane Triacrylate, Pentaerythrityl Tetraoctanoate, Pentaerythrityl Tetraethylhexanoate, Pentaerythritol Tetraisostearate, Polyglyceryl-2 Isostearate, Polyglyceryl-2 Diisostearate, Polyglyceryl-2 Triisostearate, Polyglyceryl-2 Tetraisostearate, Polyglyceryl-6 Octacaprylate, Ditrimethylolpropane Oligoester (Isostearate / Sebacic Acid), Dipentaerythrityl Tripolyhydroxystearate, Lauroyl Glutamine fatty acid esters such as di(phytosteryl / octyldodecyl) phosphate, di(phytosteryl / behenyl / octyldodecyl) lauroyl glutamate, trehalose isostearate esters, dipentaerythrityl tetraisostearate, dipentaerythrityl pentaisostearate, ethylhexyl hydroxystearate, phytosterol fatty acid esters, cholesterol fatty acid esters, polyglycerin fatty acid esters, pentaerythritol fatty acid esters, dl-α-tocopherol, and dl-α-tocopherol nicotinate;Higher alcohols such as octyldodecanol, decyltetradecanol, isostearyl alcohol, hexyldecanol, and oleyl alcohol; ether oils such as alkyl-1,3-dimethylbutyl ether, dicaprylyl ether, and dicaprylyl ether; silicone oils such as dimethylpolysiloxane, diphenylpolysiloxane, methylcyclopolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, higher alcohol-modified organopolysiloxane, tris(trimethylsiloxy)methylsilane, and trimethylpentaphenyltrisiloxane; and trilanolin oils in cream or paste form. Glyceryl fatty acids, soft lanolin fatty acids, petrolatum, branched or hydroxylated cholesteryl fatty acids, dipentaerythritol fatty acid esters (such as dipentaerythritol hexahydroxystearate), hydrogenated castor oil isostearate, hydrogenated castor oil monohydroxystearate, caprylic / capric / myristic / stearic triglyceride, myristyl lactate, hydrogenated castor oil dimer dilinoleate, phytosteryl / isostearyl / cetyl / stearyl / behenyl dimer dilinoleate, phytosteryl oleate, di(phytosteryl / behenyl / octyldodecyl) lauroyl glutamate, etc.;

[0020] Of these, from the viewpoints of providing a good feel in use and excellent spreadability on the skin, higher alcohols, ester oils, and silicone oils that are liquid at 25°C are preferred, and 2-octyldodecanol, 2-ethylhexyl hydroxystearate, propylene glycol dicaprylate, polyglyceryl diisostearate, methylphenylpolysiloxane, dipentaerythrityl tetraisostearate, and natural vitamin E are more preferred.

[0021] One or more types of component (C) can be used, and from the viewpoints of a good feel in use and excellent spreadability on the skin, the content is preferably 5% by mass or more of the total composition, more preferably 10% by mass or more, even more preferably 20% by mass or more, and preferably 60% by mass or less, more preferably 50% by mass or less, and even more preferably 45% by mass or less. The content of component (C) is preferably 5 to 60% by mass of the total composition, more preferably 10 to 50% by mass, and even more preferably 20 to 45% by mass.

[0022] In addition to the above-mentioned components, the oil-based solid cosmetic preparation of the present invention may contain components that are commonly used in cosmetics, such as powders other than component (A), surfactants, water-soluble and oil-soluble polymers, ethanol, polyhydric alcohols, preservatives, antioxidants, pigments, thickeners, pH adjusters, fragrances, ultraviolet absorbers, ultraviolet scattering agents, moisturizers, blood circulation promoters, cooling agents, antiperspirants, disinfectants, skin activators, etc.

[0023] From the viewpoints of being environmentally friendly and providing an excellent feel when used, the oily solid cosmetic of the present invention preferably contains organic resin powders such as microplastics in an amount of 1% by mass or less, more preferably 0.1% by mass or less, and even more preferably substantially free of such powders, based on the total composition. Specifically, it refers to organic resin powder other than cellulose powder that is highly biodegradable. Examples of organic resin powders include crosslinked or non-crosslinked organic resin powders such as powders of one or more polymers or copolymers selected from polyamide resin, nylon resin, polyester resin, polyethylene resin, polytetrafluoroethylene resin, polypropylene resin, polystyrene resin, benzoguanamine resin, polymethylbenzoguanamine resin, polyurethane resin, vinyl resin, fluororesin, acrylic resin, and melamine resin; butyl acrylate-vinyl acetate copolymer, styrene-acrylic acid copolymer, silicone resin, and divinylbenzene-styrene copolymer. Conventional oil-based solid cosmetics contain organic resin powder such as spherical silicone resin for ease of spreadability, but the present invention can achieve excellent gloss and ease of spreadability without containing microplastics.

[0024] The oily solid cosmetic of the present invention can be produced by a conventional method, for example, by heating, melting and mixing the ingredients, then filling the mixture into a container such as a metal dish, and cooling the mixture.

[0025] The oily solid cosmetic composition of the present invention can be produced by a conventional method and can be used as a makeup cosmetic composition such as a makeup base, foundation, lipstick, blusher, eye shadow, etc., and is preferably used as a foundation. The oily solid cosmetic of the present invention can be applied by taking an appropriate amount on the hand or a sponge and gently gliding it onto the skin in a conventional manner. [Example]

[0026] Examples 1 to 5, Comparative Examples 1 to 4 Oil-based solid cosmetics (foundations) were prepared with the compositions shown in Table 1, and evaluated for natural finish, lack of powderiness, glossy finish, and spreadability on the skin during application. The results are also shown in Table 1. Among the titanium oxides used in the examples, the particle size distributions of MPY-18SI (manufactured by Daito Kasei Kogyo Co., Ltd.), JR-701 (manufactured by Teika Co., Ltd.), and MP-100 (manufactured by Teika Co., Ltd.) are as shown in Tables 2 to 4.

[0027] (Manufacturing method) The oil phase components were dissolved and mixed at 90°C, and then the powder components, which had been previously ground and mixed, were added and mixed using a triple roller or homomixer. The mixture was redissolved and degassed, and then filled into a metal dish to obtain an oil-based solid cosmetic preparation.

[0028] (Evaluation method) Five expert panelists applied each oil-based solid cosmetic (foundation) to the skin and evaluated the natural finish, lack of powderiness of the finish, glossy finish, and ease of spread during application on the skin using the following criteria. The results are shown as the average scores of the five panelists.

[0029] (1) Natural finish: 5;The finish is very natural. 4;The finish is natural. 3: The finish is somewhat natural. 2: The finish is not very natural. 1: The finish is not natural.

[0030] (2) Lack of powdery finish: 5. The finish is not very powdery. 4. The finish is not powdery. 3;The finish is not too powdery. 2: The finish is a bit powdery. 1: The finish is powdery.

[0031] (3) Glossy finish: 5;The finish looks very glossy. 4;The finish looks glossy. 3: The finish looks slightly glossy. 2: The finish doesn't look very glossy. 1; The finish does not look glossy.

[0032] (4) Spreadability during application to the skin: 5;It stretches and unfolds very smoothly. 4;Stretches and unfolds smoothly. 3: Can be stretched and spread fairly smoothly. 2: It doesn't stretch very smoothly. 1: It cannot be stretched smoothly.

[0033] [Table 1]

[0034]

Table 2

[0035]

Table 3

[0036]

Table 4

Claims

1. The following components (A) and (B): (A) Titanium oxide 4-25% by mass, (B) Wax that is solid at 25°C It contains, and as component (A), (A1) Silicone-treated (non-amino acid treated) titanium dioxide with a particle size of less than 0.1 μm, (A2a) Titanium dioxide treated with amino acids, with a particle size of 0.1 μm or more and less than 0.5 μm. (A2b) Contains amino acid-treated titanium dioxide with a particle size of 0.5 μm or larger. (A2a) / (A2b) = 0.2 to 3.5 Oil-based solid cosmetic.

2. The oily solid cosmetic composition according to claim 1, wherein the content of component (A1) is 1 to 6% by mass, the content of component (A2a) is 2 to 13% by mass, and the content of component (A2b) is 1 to 12% by mass.

3. The oily solid cosmetic composition according to claim 1 or 2, wherein the content of component (B) is 3 to 20% by mass.

4. Furthermore, the oil-based solid cosmetic composition according to claim 1 or 2, further comprising (C) an oil component that is liquid at 25°C.

5. An oil-based solid cosmetic composition according to claim 1 or 2, which does not contain microplastics.