JP2021134194A - Powdery solid cosmetic - Google Patents

Abstract

To provide a powdery solid cosmetic which has beautiful appearance, reduced caking, and excellent impact resistance.SOLUTION: There is provided a powdery solid cosmetic containing fatty acid calcium salt particles in which the carbon number of a fatty acid is 12 to 22 and a brilliant powder, in which the content of the brilliant powder is 15 to 70 mass%, the fatty acid calcium salt particles have a median diameter of 4.0 to 15.0 μm, a grain size summary value A represented by the following expression (1) satisfies the relation of A≤2.0 and an average thickness is 350 to 800 nm. The grain size summary value A=(D90-D10)/D50.... (1) (where 4.0≤D50≤15.0) D10: a 10% integrated diameter (μm) based on volume of fatty acid calcium salt particles, D50: a median diameter (μm) based on volume of fatty acid calcium salt particles, and D90: a 90% integrated diameter (μm) based on volume of fatty acid calcium salt particles.SELECTED DRAWING: None

Description

The present invention relates to a powdered solid cosmetic, and more particularly to a powdered solid cosmetic having reduced caking and excellent impact resistance.

Powdered solid cosmetics typified by foundations and eye shadows are produced by adding an oily component to a powder component such as a pigment and filling it in a container such as a middle plate. While powdered solid cosmetics are excellent in portability, there may be problems such as the molded product cracking or falling out of the container due to impacts such as vibration and dropping. In addition, there is also a problem that a hard film is formed on the surface of the cosmetic and the base is difficult to be removed (hereinafter, abbreviated as caking) as the use is repeated.

In addition, it is known to add a brilliant powder (pearl agent) as one of the methods for making the appearance of cosmetics look beautiful. The glittering powder is a plate-shaped or spherical powder that has an interference color, a pearl luster, or a metallic luster and is generally used in the field of cosmetics that exhibits luster. However, the impact resistance of the powdered solid cosmetic may be lowered by blending the glittering powder.

It is known that a metal soap is blended in order to improve the moldability and impact resistance of powdered solid cosmetics. For example, Patent Document 1 describes a solid powder cosmetic that has good usability by containing metal soap fine particles having a specific particle size, does not cause caking, and has excellent moldability and impact resistance. There is.

JP-A-2018-168145

However, the powdered solid cosmetics described in Patent Document 1 have room for improvement in terms of caking and impact resistance.
An object of the present invention is to provide a powdered solid cosmetic having a beautiful appearance, reduced caking, and excellent impact resistance.

As a result of diligent research by the present inventors, it has been found that the above-mentioned problems can be solved by containing specific fatty acid calcium salt particles. That is, the cosmetics according to the present invention are as follows.
<1> A powder solid cosmetic containing fatty acid calcium salt particles having 12 to 22 carbon atoms and a glittering powder.
The content of the brilliant powder is 15 to 70% by mass, and the content is 15 to 70% by mass.
The fatty acid calcium salt particles have a median diameter of 4.0 to 15.0 μm, a particle size summary value A represented by the following formula (1) satisfies the relationship of A ≦ 2.0, and an average thickness of 350. Powdered solid cosmetics with a diameter of ~ 800 nm.
Particle size summary value A = (D90-D10) / D50 ... Equation (1)
(However, 4.0 ≤ D50 ≤ 15.0)
D10: 10% integrated diameter (μm) based on the volume of fatty acid calcium salt particles
D50: Median diameter (μm) based on the volume of fatty acid calcium salt particles
D90: 90% integrated diameter (μm) based on the volume of fatty acid calcium salt particles
<2> The powdered solid cosmetic according to <1>, wherein the brilliant powder contains a brilliant powder having an average particle size of 15 to 200 μm.
<3> The powdered solid cosmetic according to <1> or <2>, wherein the surface is decorated with an uneven shape.

According to the present invention, it is possible to provide a cosmetic having a beautiful appearance, reduced caking, and excellent impact resistance.

The cosmetic of the present invention contains specific fatty acid calcium salt particles as a metal soap.
The fatty acid calcium salt particles in the present invention have 12 to 22 carbon atoms of fatty acid. When the number of carbon atoms of the fatty acid is 12 or more, excellent usability can be imparted to the cosmetics. On the other hand, when the number of carbon atoms is 22 or less, it is easily industrially available as a fatty acid and the productivity is high. The number of carbon atoms of the fatty acid is preferably 12 to 18 from the viewpoint of impact resistance and reduction of caking, and more preferably 14 (that is, the fatty acid calcium salt is calcium myristate).
The fatty acid is not particularly limited as long as it is a fatty acid having 12 to 22 carbon atoms. That is, it may be either a naturally occurring fatty acid or a synthetic fatty acid, it may be either a saturated fatty acid or an unsaturated fatty acid, or it may be linear or branched. Further, a functional group such as a hydroxyl group, an aldehyde group or an epoxy group may be contained in the structure of the fatty acid. As the fatty acid, linear saturated fatty acid is preferable.

Fatty acids include, for example, lauric acid, myristic acid, myristic oleic acid, palmitic acid, palmitooleic acid, stearic acid, oleic acid, linoleic acid, araquinic acid, bechenic acid, erucic acid, hydroxystearic acid and epoxy stearic acid. Among them, myristic acid is preferable. When a mixed fatty acid is used, the myristic acid content in the fatty acid is preferably 50% or more, more preferably 60% or more, still more preferably 70% or more.

The fatty acid calcium salt particles in the present invention have a median diameter (D50) of 4.0 to 15.0 μm on a volume basis. With such a particle size, it is excellent in impact resistance and caking reduction. The median diameter of the fatty acid calcium salt particles is preferably 5.0 to 12.0 μm, more preferably 6.0 to 10.0 μm. The particle size can be measured by the microtrack laser diffraction method in the same manner as the particle size summary value A described later.

In the fatty acid calcium salt particles in the present invention, the particle size summary value A represented by the following formula (1) satisfies the relationship of A ≦ 2.0.
Particle size summary value A = (D90-D10) / D50 ... Equation (1)
(However, 4.0 ≤ D50 ≤ 15.0)
D10: 10% integrated diameter (μm) based on the volume of fatty acid calcium salt particles
D50: Median diameter (μm) based on the volume of fatty acid calcium salt particles
D90: 90% integrated diameter (μm) based on the volume of fatty acid calcium salt particles
Since the particle size distribution of the fatty acid calcium salt particles is narrow, it can be uniformly present in the cosmetics, and it is easy to develop impact resistance.

In the present invention, the particle size summary value A is calculated from the particle size measured by the microtrack laser diffraction method. When the particle size summary value A is 2.0 or less, the particle size of the fatty acid calcium salt particles present in the cosmetic is uniform, the dispersibility of the cosmetic is good, the productivity is not lowered, and the purpose is It is possible to produce a cosmetic having a feeling of squeezing. It is more preferable that the particle size summary value A satisfies the relationship of 0.5 ≦ A ≦ 1.8. When the relationship of 0.5 ≦ A ≦ 1.8 is satisfied, the action and effect of the present invention can be obtained even more stably. When the particle size summary value A is 0.5 or more, the yield does not decrease and industrially stable production can be performed.
When the cumulative curve is calculated with the total volume of the powder population as 100% in the above formula (1), the particle diameters at the points where the cumulative curves are 10%, 50%, and 90% are 10% integrated diameters, respectively. (D10), 50% median diameter (D50; median diameter), 90% integrated diameter (D90) (μm).
The particle size summary value A is adjusted by using the concentration of the fatty acid alkaline compound salt, the temperature at the time of reaction between the fatty acid alkaline compound salt and the calcium salt, and the calcium salt-containing aqueous solution as the fatty acid alkaline compound in the method for producing the fatty acid calcium salt particles described later. This can be done by appropriately adjusting the dropping rate at the time of dropping into the salt-containing aqueous solution. Further, a particle having a wide particle size distribution, that is, a large particle size summary value A, can be adjusted by classifying using a sieve of 100 mesh, 200 mesh, 330 mesh or the like in the post-treatment.

The microtrack laser diffraction method used here is a method for obtaining a particle size distribution by utilizing scattered light obtained by irradiating particles with laser light. In the present invention, the measurement is performed by a wet method in which the sample is directly put into a place where an organic solvent in which fatty acid calcium salt particles are not dissolved, for example, an organic solvent such as ethanol or isopropyl alcohol is circulated. Further, the measurement target in the present invention is a particle size in the range of 0.1 μm to 200 μm, and the value represented by the above formula (1) is defined as the particle size summary value A. In the present invention, for example, the measurement can be performed using the Microtrack MT-3000 manufactured by Nikkiso Co., Ltd.

The fatty acid calcium salt particles in the present invention have an average thickness of 350 to 800 nm. With such a thickness, it becomes easy to unravel even under mild mixing conditions (manufacturing method) to cosmetics, it becomes easy to apply it uniformly to the skin as a cosmetic, and it becomes possible to improve the feel after application. Further, with such a thickness, impact resistance is sufficient when cosmetics are added, and caking is less likely to occur. The average thickness of the particles is more preferably 400 to 700 nm. If it satisfies 400 to 700 nm, the action and effect of the present invention can be obtained more stably.
The particle thickness is a value of the length of the side surface when the surface having the largest area of the fatty acid calcium salt particles is the front surface.

The above-mentioned fatty acid calcium salt particles having a specific thickness will be described later in the description of the production method, but when the calcium salt-containing aqueous solution and the fatty acid alkaline compound salt-containing aqueous solution separately prepared by the metathesis reaction are mixed, the fatty acid alkaline compound salt is contained. It can be obtained by gradually dropping a calcium salt-containing aqueous solution into the aqueous solution at an appropriate rate.

The shape of the fatty acid calcium salt particles in the present invention is not particularly limited, but it is preferably plate-shaped.

The powdered solid cosmetic of the present invention is excellent in impact resistance by containing the fatty acid calcium salt particles having the above-mentioned specific properties. This is because the particle size summary value A satisfies the relationship of A ≦ 2.0, that is, the particle size distribution of the fatty acid calcium salt particles is narrow, the dispersibility is good, and the particles are uniformly distributed in the molded body. It is presumed that this is because the strain is less biased when an impact is applied and stress relaxation is easily performed in the entire bulk. As a result, it is considered that the fatty acid calcium salt particles uniformly dispersed in the molded body can disperse the stress of impact while firmly adhering the powders to each other, and the impact resistance is improved.

The powdered solid cosmetic of the present invention contains fatty acid calcium salt particles having the above-mentioned specific properties, so that caking is reduced.

The content of the fatty acid calcium salt particles in the powdered solid cosmetic of the present invention is preferably 0.01 to 30% by mass, more preferably 0.1 to 20% by mass, and particularly preferably 0.1 to 20% by mass from the viewpoint of impact resistance and reduction of caking. It is 1 to 10% by mass.

The above-mentioned specific fatty acid calcium salt particles react a fatty acid alkaline compound salt obtained by reacting a fatty acid having 12 to 22 carbon atoms with a monovalent alkaline compound and a divalent calcium salt in an aqueous solution. It can be prepared by the compound decomposition method.

Examples of the monovalent alkaline compound used as a raw material for the fatty acid alkali compound salt include hydroxides of alkali metals (sodium, potassium, etc.) and amines such as ammonia, monoethanolamine, diethanolamine, and triethanolamine. A hydroxide of an alkali metal such as sodium or potassium is preferable because it has high solubility in water when it is used as a fatty acid alkali compound salt.

The fatty acid alkaline compound salt used in the present invention contains a monovalent alkaline compound and a fatty acid at a temperature generally equal to or higher than the melting point of the fatty acid and at a temperature at which the fatty acid is not decomposed, preferably 100 ° C. or lower, more preferably 50 to 50 to It is obtained by reacting at 100 ° C., more preferably 60 to 95 ° C., particularly preferably 70 to 95 ° C.

The fatty acid calcium salt particles of the present invention can be obtained, for example, by reacting the fatty acid alkaline compound salt obtained above with a calcium salt in an aqueous solution. The calcium salt is specifically a salt of inorganic calcium and an inorganic acid or an organic acid. Examples of the calcium salt include calcium chloride and calcium acetate. In particular, calcium chloride is preferable because it has a high solubility in water and efficiently reacts with a fatty acid alkaline compound salt.

The reaction between the fatty acid alkaline compound salt and the divalent calcium salt is specifically carried out by separately preparing a calcium salt-containing aqueous solution and a fatty acid alkaline compound salt-containing aqueous solution, and then mixing them. For example, it is carried out by adding a calcium salt-containing aqueous solution to a fatty acid alkali compound salt-containing aqueous solution, or by adding both to another reaction vessel.

When mixing the fatty acid alkali compound salt-containing aqueous solution and the calcium salt-containing aqueous solution, for example, if the calcium salt-containing aqueous solution is added to the fatty acid alkaline compound salt-containing aqueous solution at once, the shape of the obtained fatty acid calcium salt particles becomes non-uniform. Therefore, the particle size distribution may become wider. Therefore, in the present invention, it is preferable that the calcium salt-containing aqueous solution is gradually added dropwise to the fatty acid-alkali compound salt-containing aqueous solution at an appropriate rate. The dropping rate is preferably 0.005 to 0.8 mol / mol, more preferably 0.01 to 0.5 mol / mol, per unit time. By mixing at such a dropping rate, the exchange reaction between alkali and calcium can be moderately promoted, and fatty acid calcium salt particles having an appropriate thickness can be obtained. When this rate is 0.005 mol / mol or more, the thickness of the particles is not thinned, and fatty acid calcium salt particles having a desired thickness can be obtained. On the other hand, when the dropping rate per unit time is 0.8 mol / mol or less, the shape of the fatty acid calcium salt particles becomes uniform and the particles have a desired thickness, so that the particle size is not uneven and is good. ..
The unit "mol / mol" of the calcium salt to be dropped is the number of moles of the calcium salt to be dropped with respect to 1 mol of the fatty acid alkali compound.

The concentration of the fatty acid alkali compound salt during the production of the fatty acid calcium salt is usually from 1% by mass to the point of productivity of the fatty acid calcium salt and the handleability of the fatty acid alkali compound salt-containing aqueous solution or the obtained fatty acid calcium salt slurry. It is 20% by mass, preferably 5% by mass to 15% by mass. When the concentration of the fatty acid alkaline compound salt is 1% by mass or more, the productivity of the fatty acid calcium salt is good, which is preferable. When it is 20% by mass or less, the viscosity of the fatty acid alkali compound salt-containing aqueous solution or the obtained fatty acid calcium salt slurry does not increase, and a uniform reaction can be carried out. The concentration of the calcium salt in the calcium salt-containing liquid is usually 10% by mass or more from the viewpoint of the productivity of the fatty acid calcium salt and the handleability of the fatty acid alkali compound salt-containing aqueous solution or the obtained fatty acid calcium salt slurry. It is 50% by mass, preferably 10% by mass to 40% by mass.

The reaction between the fatty acid alkaline compound salt and the calcium salt is carried out under the temperature conditions normally performed by those skilled in the art in consideration of the solubility of the fatty acid alkaline compound salt. It is preferably 50 to 100 ° C, more preferably 60 to 95 ° C. When the reaction temperature is 50 ° C. or higher, the reaction rate between the fatty acid alkaline compound salt and the calcium salt is good.

Polyalkylene glycol ethers, especially oxypropylene blocks, are sandwiched between oxyethylene blocks for the purpose of stabilizing the fatty acid calcium salt slurry during the reaction of the fatty acid alkali compound salt with the calcium salt and improving the productivity of the fatty acid calcium salt. It is preferable that a triblock ether having a structure (EO-PO-EO) is present in the fatty acid calcium salt slurry. The content of the polyalkylene glycol-based ether in the fatty acid calcium salt slurry is usually 0.01 part by mass to 5 parts by mass, preferably 0.05 parts by mass to 2 parts by mass with respect to 100 parts by mass of the fatty acid alkali compound salt. be. The polyalkylene glycol-based ether may be present in the reaction system before the reaction between the monovalent alkaline compound and the fatty acid, or may be present in the reaction system before the reaction between the fatty acid alkali compound salt and the calcium salt. You may.

By this method, a fatty acid calcium salt cake having a reduced water content is obtained by separating it with a dehydrator, a filter press, or the like. The fatty acid calcium salt cake having a reduced water content is dried by a rotary dryer, an air flow dryer, a ventilation type shelf dryer, a spray type dryer, a fluidized bed type dryer, or the like.

In the present invention, the fatty acid calcium salt cake is dried at (α-40) ° C. ≤ α≤ (α + 5) ° C. with respect to the water evaporation peak top temperature (α ° C.) of the fatty acid calcium salt to be produced. is required. Here, the contained water evaporation peak top temperature is the top peak of the peak in the temperature range in which the residual water contained in the fatty acid calcium salt, which cannot be removed by drying, begins to desorb. For example, calcium myristate. In the heat absorption graph by differential thermal analysis (DSC), the peak top temperature of water evaporation is 110.3 ° C. The specific drying temperature varies depending on the type of fatty acid calcium salt obtained, but in the case of calcium myristate, for example, it is 115 ° C. or lower. When the drying treatment is performed at a temperature higher than 115 ° C., adhesion between fine particles occurs, and the thickness of the particles tends to increase. On the other hand, when the drying treatment is performed at a temperature lower than 70 ° C., the drying property is lowered and a large amount of water remains in the compound.
By the above method, fatty acid calcium salt particles are obtained.

The powdered solid cosmetic of the present invention further contains a brilliant powder (pearling agent). The brilliant powder can impart beautiful brilliance, but if it is too much, the impact resistance is lowered. From this point of view, the content of the glittering powder is 15% by mass or more, more preferably 20% by mass or more, and 70% by mass or less, preferably 60% by mass or less, more preferably 50% by mass or less, still more preferably. It is less than 50% by mass.

The powdered solid cosmetic of the present invention preferably has an average particle size (median diameter) of 15 to 200 μm, more preferably 20 to 200 μm, and further preferably 25 to 25, from the viewpoint of imparting high brilliance as a brilliant powder. It preferably contains 200 μm, particularly preferably 50-200 μm of brilliant powder.

As the brilliant powder, a plate-shaped or spherical powder having an interference color, a pearl luster, or a metallic luster and exhibiting luster, which is usually used for cosmetics, can be used. For example, Titanium Mica, Titanium Coated with Iron Oxide, Titanium Coated with Carmine, Titanium Coated with Carmine / Conjo, Titanium Coated with Iron / Carmine, Titanium Coated with Conjo, Titanium Coated with Iron Oxide / Titanium Coated with Chromium Oxide, Black titanium oxide treated mica titanium, acrylic resin coated aluminum powder, silica coated aluminum powder, titanium oxide coated mica, titanium oxide coated bismuth oxychloride, titanium oxide coated talc, colored titanium oxide coated mica, titanium oxide coated synthetic mica, titanium oxide coated Examples thereof include silica, titanium oxide-coated alumina, titanium oxide-coated glass flakes, polyethylene terephthalate / polymethylmethacrylate laminated film powder, bismuth oxychloride, and fish scale foil.

The powdered solid cosmetic of the present invention preferably contains an oily component from the viewpoint of impact resistance and moldability. The content of the oily component in the powdered solid cosmetic is preferably 5 to 25% by mass. Examples of the oily component include liquid oil and solid oil.
Further, from the viewpoint of impact resistance and moldability, it is preferable to contain polar oil as the liquid oil component. The IOB of the polar oil is preferably 0.01 or more, more preferably 0.1 or more. The IOB of the polar oil is preferably 0.6 or less from the viewpoint of impact resistance.
The content of such polar oil is preferably 20% by mass or more, more preferably 30% by mass or more, and preferably 95% by mass or less, more preferably 90% by mass or more, based on the total amount of oily components. It is mass% or less.

Examples of polar oils with an IOB of 0.01 or more include oleic acid (IOB value = 0.42), isostearic acid (IOB value = 0.43), isopropyl myristate (IOB value = 0.18), and palmitic acid. Octyl (IOB value = 0.13), isopropyl palmitate (IOB value = 0.16), butyl stearate (IOB value = 0.14), hexyl laurate (IOB value = 0.17), myristyl myristate (IOB value = 0.17) IOB value = 0.11), decyl oleate (IOB value = 0.11), isononyl isononanoate (IOB value = 0.20), isotridecyl isononanoate (IOB value = 0.15), cetyl ethylhexanoate (IOB) Value = 0.13), glycol distearate (IOB value = 0.16), glyceryl diisostearate (IOB value = 0.29), neopentyl glycol dicaprate (IOB value = 0.25), diisostearyl malate (IOB value = 0.28), Trimethylolpropane triisostearate (IOB value = 0.16), Glyceryl tri2-ethylhexanoate (triethylhexanoin) (IOB value = 0.35), Trimethylolpropane trioctanoate (IOB value = 0.33), Trimethylolpropane triisostearate (IOB value = 0.16), Diisobutyl adipate (IOB value = 0.46), N-lauroyl-L-glutamic acid-2-octyldodecyl ester (IOB value = 0.46) IOB value = 0.29), 2-hexyldecyl adipate (IOB value = 0.16), diisopropyl sebacate (IOB value = 0.40), ethylhexyl methoxycinnamate (IOB value = 0.28), olive oil (IOB value = 0.28) IOB value = 0.16), castor oil (IOB value = 0.43), decyltetradecanol (IOB value = 0.21), octyldodecanol (IOB value = 0.26), oleyl alcohol (IOB value =) 0.28) and the like.
Further, as the liquid oil component other than the polar oil, other liquid oily components such as hydrocarbon oil may be used in combination as long as the effect of the present invention is not impaired.

Further, the powdered solid cosmetic of the present invention may contain a solid oil component as an oily component as long as the effect of the present application is not impaired. The solid oil content is not particularly limited as long as it is an oil content that can be blended in cosmetics. Specific examples of solid oil content include solid paraffin, ceresin, microcrystalin wax, polyethylene wax, hardened oil, honey wax, mokuro, gay wax, candelilla wax and other hydrocarbons, waxes, stearic acid, lauric acid, and myristic acid. , Higher fatty acids such as paraffinic acid, higher alcohols such as cetyl alcohol, stearyl alcohol, and lauryl alcohol.

The powdered solid cosmetic of the present invention may further contain an inorganic powder and an organic powder. Examples of the inorganic powder include titanium oxide, zinc oxide, red iron oxide, yellow iron oxide, black iron oxide inorganic pigment, mica, and talc. Examples of the organic powder include organic pigments such as natural pigments. Further, these powders may be surface-treated with a fluorine compound, a silicone compound, a fatty acid or the like.

In the powdered solid cosmetics of the present invention, in addition to the above-mentioned ingredients, other ingredients usually used in cosmetics and the like can be appropriately blended as long as the effects of the present invention are not impaired. Other ingredients include, for example, surfactants, moisturizers, polymers, dyes, lower alcohols, polyhydric alcohols, antioxidants, UV absorbers, beauty ingredients, antibacterial agents, preservatives, pH adjusters, fragrances, etc. Can be mentioned.

Since the powdered solid cosmetic of the present invention has excellent impact resistance, it is suitable as a cosmetic in which the surface of the cosmetic is decorated with an uneven shape such as a pattern or characters.

Applications of the powdered solid cosmetics of the present invention include, for example, make-up cosmetics such as foundations, concealers, face powders, control colors, eye shadows, eyeliners, teak colors, body powders, perfume powders, baby powders, etc. Can be done.

The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. Unless otherwise specified, the blending amount is shown in mass% with respect to the system in which the component is blended.

<Evaluation of calcium myristate salt particles>
Calculated from the median diameter and particle size summary value A [10% integrated diameter D10 (μm) on a volume basis, median diameter D50 (μm) on a volume basis, and 90% integrated diameter D90 (μm) on a volume basis) for calcium myristate particles. ] And the thickness of the particles were measured by the above-mentioned method using the following devices.

(1) Particle size summary value A, median diameter 2.0 g of a sample was collected in a 100 ml glass beaker, and 3 to 5 ml of a nonionic surfactant (eg, Nonion NS-210 manufactured by NOF CORPORATION) was dropped and blended with a spatula. No. Next, 20 ml of purified water was added and dispersed by ultrasonic waves to make 100 ml, which was used as a measurement sample. The sample was supplied to a particle size distribution measuring device (equipment name "Microtrack MT-3000" manufactured by Nikkiso Co., Ltd.) and measured (principle: laser diffraction / scattering method).
When the cumulative curve is calculated with the total volume of the group of powders to be measured as 100%, the particle diameters at the points where the cumulative curves are 10%, 50%, and 90% are 10% diameter (D10) and 50% diameter, respectively. (D50; median diameter), 90% diameter (D90) (μm). From the obtained D10, D50, and D90, the particle size summary value A was determined.

(2) Particle thickness The particle thickness was measured by the following method using a scanning electron microscope. After adhering the particles to the carbon double-sided tape, a sample in which the particle surface was coated with platinum particles by a vapor deposition method was observed at an acceleration voltage of 1.0 kV and a magnification of 2000 times, and the thickness of any particle was measured.

<Preparation of calcium myristate particles>
Calcium myristate particles having a median diameter (D50) = 6.7 μm, D10 = 4.1 μm, D90 = 11.0 μm, a particle size summary value A = 1.0, and an average particle thickness of 596 nm were prepared by the following method.
250 g of myristic acid (NAA-142 manufactured by NOF Corporation), 1.25 g of polyethylene glycol, polypropylene glycol, block ether (trade name: Pronon # 104, manufactured by NOF Corporation) and 2500 g of water in a 3 L separable flask. Was charged and the temperature was raised to 90 ° C. Next, 87.0 g of a 48 mass% sodium hydroxide aqueous solution was added, and the mixture was stirred at the same temperature (90 ° C.) for 1 hour to obtain a sodium myristic acid salt aqueous solution. Then, while maintaining the temperature at 90 ° C., 174.5 g of a 35 mass% calcium chloride aqueous solution was added dropwise to the sodium myristic acid salt aqueous solution over 30 minutes [drop rate: 0.39 (mol / mol)]. After completion of the dropping, the mixture was kept at 90 ° C. and stirred for 10 minutes for aging. 1500 g of water was added to the obtained mixed fatty acid calcium salt aqueous solution slurry, and the mixture was cooled to 65 ° C. or lower. Then, it is filtered with a suction filter, washed twice with 1000 g of water, and the obtained cake is dried at 80 ° C. using a ventilation type shelf dryer, crushed with a mill, and myristic acid calcium salt particles. Got

<Zinc myristate>
For comparison, zinc myristate (powder base M manufactured by NOF CORPORATION) having a median diameter of 10 μm and a particle thickness of 304 nm on average was prepared.

<Magnesium myristate>
For comparison, magnesium myristate (manufactured by Taihei Kagaku Sangyo Co., Ltd.) with a median diameter of 17 μm was prepared.

Examples 1 and 2 and Comparative Examples 1 to 4: Production of eye shadows Eye shadows having the compositions shown in Table 1 were prepared according to the following production methods.
Production method: Using a Henschel mixer (registered trademark), powder components and brilliant powder were stirred with a mixer to obtain Part A. The oily component and the like as a binder were heated with stirring to obtain a dissolved part B. Later, while stirring part A, part B was gradually added to obtain part C. A volatile solvent was added to Part C, and wet mixing was performed to make a slurry by stirring. Wet molding was performed in which the slurry was filled in a container, the solvent was removed through vacuum suction and drying steps, and the powder was solidified.

<Evaluation method>
Impact resistance:
Three cosmetic test bodies of Examples and Comparative Examples were dropped from a height of 30 cm. For the test piece after dropping, the number of drops until cracks, cracks, cracks, peeling, etc. occurred was measured. Table 1 shows the minimum number of times for each test piece. If it exceeds 20 times, the impact resistance is good.

Caking:
The presence or absence of cosmetic caking was evaluated by the following method. The results are shown in Table 1.
The sample was allowed to stand in a constant temperature and humidity chamber at 37 ° C. and a relative humidity of 90% for 24 hours, then taken out, and the degree of caking after rubbing the surface 200 times with a chip was visually evaluated.

As shown in Table 1, all of the eye shadows of the examples containing the specific calcium myristic acid salt particles had excellent impact resistance even though the bright powder was highly blended, and caking did not occur. On the other hand, the eye shadows of Comparative Examples did not have good impact resistance, and in Comparative Examples 2 and 4, caking also occurred.

Claims (3)

A powder solid cosmetic containing fatty acid calcium salt particles having 12 to 22 carbon atoms and a glittering powder.
The content of the brilliant powder is 15 to 70% by mass, and the content is 15 to 70% by mass.
The fatty acid calcium salt particles have a median diameter of 4.0 to 15.0 μm, a particle size summary value A represented by the following formula (1) satisfies the relationship of A ≦ 2.0, and an average thickness of 350. Powdered solid cosmetics with a diameter of ~ 800 nm.
Particle size summary value A = (D90-D10) / D50 ... Equation (1)
(However, 4.0 ≤ D50 ≤ 15.0)
D10: 10% integrated diameter (μm) based on the volume of fatty acid calcium salt particles
D50: Median diameter (μm) based on the volume of fatty acid calcium salt particles
D90: 90% integrated diameter (μm) based on the volume of fatty acid calcium salt particles The powder solid cosmetic according to claim 1, wherein the brilliant powder contains a brilliant powder having an average particle size of 15 to 200 μm. The powder solid cosmetic according to claim 1 or 2, wherein the surface is decorated with an uneven shape.