CN115003271B

CN115003271B - Powder solid cosmetic

Info

Publication number: CN115003271B
Application number: CN202180011521.5A
Authority: CN
Inventors: 西山佳宏; 金丸哲也; 广崎贤
Original assignee: Shiseido Co Ltd
Current assignee: Shiseido Co Ltd
Priority date: 2020-02-28
Filing date: 2021-02-24
Publication date: 2024-03-08
Anticipated expiration: 2041-02-24
Also published as: JP2021134195A; WO2021172351A1; JP7521905B2; CN115003271A; JP2024124578A

Abstract

The present invention relates to a powdery solid cosmetic comprising fatty acid calcium salt particles having 12 to 22 carbon atoms of fatty acid and an oily component comprising a polar oil having an IOB of 0.01 or more, wherein the fatty acid calcium salt particles have a median particle diameter of 4.0 to 15.0 [ mu ] m, a particle size description value A expressed by a specific formula satisfies the relation of A.ltoreq.2.0, and an average thickness of 350 to 800nm.

Description

Powder solid cosmetic

Technical Field

The present invention relates to a powder solid cosmetic, and more particularly, to a powder solid cosmetic excellent in impact resistance.

Background

Powder solid cosmetics represented by foundations and eye shadows are produced by adding an oily component to a powder component such as a pigment, and filling the powder component into a container such as a middle plate. The powder solid cosmetic is excellent in portability, and on the other hand, the following problems may occur: the molded product is broken by an impact such as vibration or dropping, and is released from the container.

In addition, as one of methods for making the appearance of cosmetics look attractive, it is known to compound a glittering powder (pearlizing agent). The brightening powder is: plate-like or spherical powder having an interference color, a pearl luster, or a metallic luster, which is generally used in the cosmetic field for expressing luster. However, there is a case where the impact resistance of the powder solid cosmetic is lowered due to the blending of the shining powder.

In order to improve the moldability and impact resistance of a powder solid cosmetic, it is known to blend a metal soap. For example, patent document 1 describes: a solid powder cosmetic having excellent usability and impact resistance by containing metal soap particles of a specific particle size.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2018-168145

Disclosure of Invention

Problems to be solved by the invention

However, the powder solid cosmetic described in patent document 1 has room for improvement in impact resistance.

The purpose of the present invention is to provide a powder solid cosmetic having excellent impact resistance.

Solution for solving the problem

The present inventors have conducted intensive studies and as a result found that: the above problems can be solved by comprising specific fatty acid calcium salt particles and specific polar oil. Namely, the cosmetics according to the present invention are as follows.

<1> a powder solid cosmetic comprising fatty acid calcium salt particles having 12 to 22 carbon atoms of fatty acid and an oily component,

the oily component contains polar oil having an IOB of 0.01 or more,

the fatty acid calcium salt particles have a median particle diameter of 4.0 to 15.0 μm, a particle size description value A represented by the following formula (1) satisfies the relationship of A.ltoreq.2.0, and an average thickness of 350 to 800nm.

Particle size description A= (D90-D10)/D50 … type (1)

(wherein, D50 is more than or equal to 4.0 and less than or equal to 15.0)

D10: 10% cumulative particle diameter (μm) in volume basis of fatty acid calcium salt particles

D50: median particle diameter (μm) in volume basis of fatty acid calcium salt particles

D90: 90% cumulative particle diameter (μm) in volume basis of fatty acid calcium salt particles

<2> the powder solid cosmetic according to <1>, further comprising 30 mass% or more of a shiny powder.

<3> the powder solid cosmetic product according to <2>, wherein the brightening powder comprises a brightening powder having an average particle size of 15 to 200 μm.

<4> the powder solid cosmetic according to any one of <1> to <3>, wherein a decorative pattern of a concave-convex shape is applied to the surface thereof.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a powder solid cosmetic excellent in impact resistance can be provided.

Detailed Description

The cosmetic of the present invention contains specific fatty acid calcium salt particles as a metal soap.

The fatty acid calcium salt particles of the present invention have a carbon number of 12 to 22. By setting the carbon number of the fatty acid to 12 or more, excellent usability of the cosmetic can be imparted. On the other hand, the carbon number is 22 or less, so that the fatty acid can be easily obtained industrially, and the productivity is high. From the viewpoint of impact resistance, the carbon number of the fatty acid is preferably 12 to 18, more preferably 14 (i.e., 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, the fatty acid may be either a natural fatty acid or a synthetic fatty acid, a saturated fatty acid or an unsaturated fatty acid, or a linear or branched fatty acid. Further, the fatty acid may have a functional group such as a hydroxyl group, an aldehyde group, or an epoxy group in its structure. The fatty acid is preferably a linear saturated fatty acid.

Examples of the fatty acid include lauric acid, myristic acid, myristoleic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, linoleic acid, arachic acid, behenic acid, erucic acid, hydroxystearic acid, and epoxystearic acid, and among these, 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, and still more preferably 70% or more.

The fatty acid calcium salt particles of the present invention have a volume-based median particle diameter (D50) of 4.0 to 15.0. Mu.m. The particle diameter is excellent in impact resistance. The median particle diameter of the fatty acid calcium salt particles is preferably 5.0 to 12.0. Mu.m, more preferably 6.0 to 10.0. Mu.m. The particle size can be measured by the MICROTRAC laser diffraction method in the same manner as the particle size description value a described later.

Regarding the fatty acid calcium salt particles in the present invention, the particle size description value A represented by the following formula (1) satisfies the relationship of A.ltoreq.2.0.

Particle size description A= (D90-D10)/D50 … type (1)

(wherein, D50 is more than or equal to 4.0 and less than or equal to 15.0)

By narrowing the particle size distribution of the fatty acid calcium salt particles, the fatty acid calcium salt particles can be uniformly present in cosmetics, and impact resistance can be easily exhibited.

In the present invention, the particle size description value a is calculated from the particle size measured by the MICROTRAC laser diffraction method. By setting the particle size description value a to 2.0 or less, the particle size of the fatty acid calcium salt particles present in the cosmetic becomes uniform, the dispersibility of the cosmetic is good, the productivity is not lowered, and the cosmetic having a target touch can be produced. The particle size description value A more preferably satisfies the relationship of 0.5.ltoreq.A.ltoreq.1.8. When the relation of A being more than or equal to 0.5 and less than or equal to 1.8 is satisfied, the action and effect of the invention can be obtained more stably. If the particle size description value A is 0.5 or more, the yield is not lowered, and the production can be industrially stably performed.

In the above formula (1), when the cumulative curve is obtained by setting the total volume of the powder aggregate to 100%, the particle diameters at the points where the cumulative curve is 10%, 50% and 90% are referred to as 10% cumulative particle diameter (D10), 50% median particle diameter (D50; median particle diameter) and 90% cumulative particle diameter (D90) (μm), respectively.

The particle size description value a can be adjusted by appropriately adjusting the concentration of the fatty acid basic compound salt, the temperature at which the fatty acid basic compound salt reacts with the calcium salt, and the dropping rate at which the aqueous solution containing the calcium salt is dropped into the aqueous solution containing the fatty acid basic compound salt, respectively, in the method for producing fatty acid calcium salt particles described later. The substance having a broad particle size distribution, in other words, a large value of the particle size description value a can be adjusted by classifying the substance using a 100-mesh, 200-mesh, 330-mesh sieve or the like in the subsequent treatment.

The MICROTRAC laser diffraction method used herein is a method of obtaining a particle size distribution by using scattered light obtained by irradiating particles with laser light. In the present invention, the following wet-type measurement is set: when an organic solvent in which the fatty acid calcium salt particles are not dissolved, for example, an organic solvent such as ethanol or isopropanol is circulated, the sample is directly introduced. In the present invention, the particle size of the object to be measured is 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 description value A. In the present invention, for example, MICROTRAC MT-3000 manufactured by Nikkin corporation may be used for measurement.

The fatty acid calcium salt particles in the present invention have an average thickness of 350 to 800nm. By providing the above thickness, the cosmetic composition can be easily dispersed even under the condition (manufacturing method) of being gently mixed into the cosmetic composition, can be easily and uniformly applied to the skin as a cosmetic composition, and can also improve the touch feeling after application. Further, the above thickness gives sufficient impact resistance when added to cosmetics. The average thickness of the particles is more preferably 400 to 700nm. If 400 to 700nm is satisfied, the operational effect of the present invention can be obtained more stably.

The thickness of the particles means: the length of the side surface when the largest surface area of the fatty acid calcium salt particles is the front surface is set as the length value.

The fatty acid calcium salt particles of the above specific thickness are described in detail in the following description of the production method, but can be obtained as follows: when the aqueous solution containing a calcium salt prepared by the metathesis reaction and the aqueous solution containing a fatty acid alkali compound salt are mixed, the aqueous solution containing a calcium salt is slowly dropped into the aqueous solution containing a fatty acid alkali compound salt at an appropriate rate.

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

The powder solid cosmetic of the present invention is excellent in impact resistance by containing the fatty acid calcium salt particles having the above specific properties. This is presumably because: in particular, by narrowing the particle size distribution of the fatty acid calcium salt particles, which satisfies the relation that A.ltoreq.2.0, the dispersibility is good and the particles are uniformly distributed in the molded article, so that the strain deviation at the time of impact application is small, and the stress relaxation of the whole agglomerate is easy. It can be considered that: as a result, the fatty acid calcium salt particles uniformly dispersed in the molded article can firmly bond the powders to each other, and can disperse the impact stress, thereby improving the impact resistance.

The content of the fatty acid calcium salt particles in the powder 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 1 to 10% by mass, from the viewpoint of impact resistance.

The above-mentioned specific fatty acid calcium salt particles can be produced by a double decomposition method in which a fatty acid basic compound salt obtained by reacting a monovalent basic compound with a fatty acid having 12 to 22 carbon atoms and a divalent calcium salt are reacted in an aqueous solution.

Examples of the monovalent basic compound as a raw material of the fatty acid basic compound salt include hydroxides of alkali metals (sodium, potassium, etc.); amines such as ammonia, monoethanolamine, diethanolamine and triethanolamine. From the viewpoint of high solubility in water in the production of the fatty acid alkali compound salt, alkali metal hydroxides such as sodium and potassium are preferable.

The fatty acid basic compound salt used in the present invention is obtained by reacting a monovalent basic compound with a fatty acid at a temperature generally higher than the melting point of the fatty acid and to such an extent that the fatty acid does not decompose, preferably at 100 ℃ or lower, more preferably at 50 to 100 ℃, still more preferably at 60 to 95 ℃, particularly preferably at 70 to 95 ℃.

The fatty acid calcium salt particles of the present invention can be obtained, for example, by reacting the fatty acid basic compound salt obtained as described above with a calcium salt in an aqueous solution. Specifically, the calcium salt is a salt of inorganic calcium with an inorganic acid or an organic acid. Examples of the calcium salt include calcium chloride and calcium acetate. In particular, calcium chloride is preferable from the viewpoint of high solubility in water and efficient reaction with the fatty acid alkali compound salt.

For the reaction of the fatty acid basic compound salt with the divalent calcium salt, specifically, it can be carried out by the following means: after preparing an aqueous solution containing a calcium salt and an aqueous solution containing a fatty acid basic compound salt, respectively, they are mixed to perform. For example, the reaction is carried out by adding an aqueous solution containing a calcium salt to an aqueous solution containing a fatty acid alkali compound salt, or adding both to another reaction tank.

When an aqueous solution containing a fatty acid basic compound salt is mixed with an aqueous solution containing a calcium salt, for example, if the aqueous solution containing a calcium salt is added to the aqueous solution containing a fatty acid basic compound salt at one time, the shape of the obtained fatty acid calcium salt particles may become uneven, and the particle size distribution may be widened. Therefore, in the present invention, it is preferable to slowly drop an aqueous solution containing a calcium salt into an aqueous solution containing a fatty acid alkali compound salt at an appropriate rate. The drop acceleration is preferably 0.005 to 0.8 mol/mol, more preferably 0.01 to 0.5 mol/mol, per unit time. By mixing at this dropping rate, the exchange reaction between the base and the calcium can be performed gently, and the fatty acid calcium salt particles having an appropriate thickness can be obtained. By setting the speed to 0.005 mol/mol or more, the thickness of the particles is not thinned, and the fatty acid calcium salt particles having a desired thickness can be obtained. On the other hand, by setting the drop rate per unit time to 0.8 mol/mol or less, the particles of the fatty acid calcium salt are uniform in shape and become a desired thickness, and therefore, the particle size is not uniform, and it is preferable.

The unit "mol/mol" of the calcium salt to be added dropwise is the number of moles of the calcium salt to be added dropwise relative to 1 mole of the fatty acid-based compound.

The concentration of the fatty acid basic compound salt at the time of producing the fatty acid calcium salt is usually 1 to 20% by mass, preferably 5 to 15% by mass, from the viewpoint of productivity of the fatty acid calcium salt and from the viewpoint of handling of the aqueous solution containing the fatty acid basic compound salt or the obtained fatty acid calcium salt slurry. If the concentration of the fatty acid basic compound salt is 1 mass% or more, the productivity of the fatty acid calcium salt is good, and it is preferable. If the content is 20% by mass or less, the viscosity of the aqueous solution containing the fatty acid basic compound salt or the obtained fatty acid calcium salt slurry does not increase, and a uniform reaction can be performed. The concentration of the calcium salt in the liquid containing the calcium salt is usually 10 to 50% by mass, preferably 10 to 40% by mass, from the viewpoint of the productivity of the fatty acid calcium salt and from the viewpoint of the handleability of the aqueous solution containing the fatty acid basic compound salt or the obtained fatty acid calcium salt slurry.

The reaction of the fatty acid basic compound salt with the calcium salt is carried out under temperature conditions generally carried out by those skilled in the art in view of the solubility of the fatty acid basic compound salt. Preferably 50 to 100℃and more preferably 60 to 95 ℃. If the reaction temperature is 50 ℃ or higher, the reaction rate of the fatty acid basic compound salt and the calcium salt is good.

For the purpose of stabilizing the fatty acid calcium salt slurry at the time of the reaction of the fatty acid basic 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) obtained by sandwiching a polyalkylene glycol-based ether, particularly an oxypropylene segment, with an oxyethylene segment is present in the fatty acid calcium salt slurry. The content of the polyalkylene glycol ether in the fatty acid calcium salt slurry is usually 0.01 to 5 parts by mass, preferably 0.05 to 2 parts by mass, relative to 100 parts by mass of the fatty acid basic compound salt. The polyalkylene glycol ether may be present in the reaction system before the monovalent alkali compound is reacted with the fatty acid, or may be present in the reaction system before the salt of the fatty acid alkali compound is reacted with the calcium salt.

By the method, a dehydrator, a filter press and the like are utilized for separation, and a fatty acid calcium salt filter cake with reduced water content is obtained. The fatty acid calcium salt cake having a reduced water content is dried by a rotary dryer, an air-flow dryer, a ventilated shelf dryer, a spray dryer, a fluidized bed dryer, or the like.

In the present invention, the drying of the fatty acid calcium salt cake must be carried out at a temperature of (. Alpha. -40). Ltoreq.α.ltoreq.α+5). Ltoreq.c with respect to the water-containing evapotranspiration peak top temperature (. Alpha.C) of the produced fatty acid calcium salt. Here, the peak top temperature of the water-containing evaporation means: the peak of the peak in the temperature range from which residual water that cannot be removed by the drying starts to be separated, which is contained in the fatty acid calcium salt, for example, contains a water vapor emission peak top temperature of 110.3 ℃ in a thermal absorption diagram of calcium myristate based on differential thermal analysis (DSC). The specific drying temperature varies depending on the kind of the obtained fatty acid calcium salt, and is, for example, 115 ℃ or lower in the case of calcium myristate. If the drying treatment is performed at a temperature higher than 115 ℃, the fine particles are coagulated, and the thickness of the particles tends to be large. On the other hand, when the drying treatment is performed at a temperature lower than 70 ℃, the drying property is lowered and a large amount of moisture remains in the compound.

The fatty acid calcium salt particles are obtained by the above-described method.

The powder solid cosmetic of the present invention contains an oily component from the viewpoint of impact resistance and moldability. The content of the oily component in the powder solid cosmetic is preferably 5 to 30% by mass. Examples of the oily component include liquid oil and solid oil.

The liquid oil component includes a polar oil from the viewpoints of impact resistance and moldability. The IOB of the polar oil is 0.01 or more, preferably 0.1 or more. By containing both the polar oil and the above fatty acid calcium salt particles, the impact resistance of the cosmetic is improved. In addition, from the viewpoint of impact resistance, the IOB of the polar oil is preferably 0.6 or less.

The content of the polar oil is preferably 20% by weight or more, more preferably 30% by weight or more, based on the total amount of the oily components, from the viewpoint of impact resistance, and is preferably 95% by weight or less, more preferably 90% by weight or less, from the viewpoint of caking.

Examples of polar oils having 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), octyl palmitate (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=0.11), decyl oleate (IOB value=0.11), isononyl isononanoate (IOB value=0.20), isotridecyl isononanoate (IOB value=0.15), ethyl cetyl caproate (IOB value=0.13), glycol distearate (IOB value=0.16), glycerol distearate (IOB value=0.29), neopentyl glycol distearate (IOB value=0.25), diisostearyl malate (b value=0.28), trimethylolpropane (IOB value=0.16), trimethylolpropane (IOB value=0.35), trimethylolpropane (IOB value-35), and trimethylolpropane (IOB value-35, which are used as polar oils having an IOB of 0.01 or more than 0.01 Adipic acid-2-hexyldecyl ester (IOB value=0.16), diisopropyl sebacate (IOB value=0.40), ethylhexyl methoxycinnamate (IOB value=0.28), olive oil (IOB value=0.16), castor oil (IOB value=0.43), decyl tetradecyl ester (IOB value=0.21), octyl dodecanol (IOB value=0.26), oleyl alcohol (IOB value=0.28), and the like.

As the liquid oil component other than the polar oil, other liquid oil components such as hydrocarbon oil may be used in combination within a range that does not impair the effects of the present application.

In the powder solid cosmetic of the present invention, a solid oil component may be blended as an oily component within a range that does not impair the effects of the present application. The solid oil is not particularly limited as long as it can be blended into cosmetics. Specific examples of the solid oil include hydrocarbons/wax oils/waxes such as paraffin wax, ceresin wax, microcrystalline wax, polyethylene wax, hydrogenated oil, beeswax, wood wax, spermaceti wax, and candelilla wax; higher fatty acids such as stearic acid, lauric acid, myristic acid, and behenic acid; higher alcohols such as cetyl alcohol, stearyl alcohol and lauryl alcohol.

The powder solid cosmetic of the present invention preferably contains a shiny powder (pearlizing agent) from the viewpoint of imparting a beautiful shininess. From the same viewpoint, the content of the luminescent powder is 30 mass% or more, preferably 40 mass% or more, and more preferably 50 mass% or more. From the viewpoint of impact resistance, it is preferably 90 mass% or less. The powder solid cosmetic of the present invention is excellent in impact resistance, and therefore, can be blended with a large amount of a shiny powder.

The powder solid cosmetic of the present invention preferably contains, as the brightening powder, a brightening powder having an average particle diameter (median particle diameter) of preferably 15 to 200 μm, more preferably 20 to 200 μm, still more preferably 25 to 200 μm, and particularly preferably 50 to 200 μm, from the viewpoint of imparting high brightening property.

As the brightening powder, a plate-like or spherical powder having an interference color, a pearl luster, or a metallic luster and exhibiting luster, which is a powder generally used in cosmetics, can be used. Examples thereof include titanium mica, iron oxide-coated titanium mica, magenta-Prussian blue-coated titanium mica, iron oxide-magenta-treated titanium mica, prussian blue-treated titanium mica, iron oxide-Prussian blue-treated titanium mica, chromium oxide-treated titanium mica, titanium oxide black-treated titanium mica, 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 silica, titanium oxide-coated alumina, titanium oxide-coated glass flakes, polyethylene terephthalate-polymethyl methacrylate laminate film powder, bismuth oxychloride, and fish scale foil.

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

In the powder solid cosmetic of the present invention, other components generally used in cosmetics and the like may be appropriately blended in addition to the above components within a range that does not impair the effects of the present invention. Examples of the other components include surfactants, moisturizers, polymers, dyes, lower alcohols, polyols, antioxidants, ultraviolet absorbers, cosmetic components, antibacterial agents, preservatives, pH adjusters, fragrances, and the like.

The powder solid cosmetic of the present invention is excellent in impact resistance, and therefore is suitable as a cosmetic having a decorative pattern such as a figure or a letter applied to the surface of the cosmetic.

The solid powder cosmetic of the present invention can be used in the form of, for example, foundation, concealer, face powder, face cream, eye shadow, eyeliner, blush, toilet powder, baby powder, or other makeup cosmetics.

Examples

The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto. The compounding amount is not particularly described, and is expressed as mass% of the component relative to the compounding system.

< evaluation of calcium myristate particles >

The median particle diameter, the particle size description value a [ calculated from the 10% cumulative particle diameter D10 (μm) in volume basis, the median particle diameter D50 (μm) in volume basis, the 90% cumulative particle diameter D90 (μm) in volume basis ], and the thickness of the particles were measured using the following apparatus, respectively, with respect to the calcium myristate particles, by the above-described method.

(1) Particle size description A, median particle size

A100 ml glass beaker was charged with 2.0g of a sample, 3 to 5ml of a nonionic surfactant (for example, NONION NS-210 manufactured by Nippon oil Co., ltd.) was added dropwise, and the mixture was mixed with a spatula. Next, 20ml of purified water was added thereto, and the mixture was dispersed by ultrasonic waves to prepare 100ml of a measurement sample. The sample was supplied to a particle size distribution measuring apparatus (machine name "MICROTRAC MT-3000", manufactured by Nikkin Co., ltd.) and measured (principle: laser diffraction/scattering method).

When a cumulative curve is obtained by setting the total volume of the powder aggregate to be measured to 100%, the particle diameters at the points where the cumulative curve becomes 10%, 50% and 90% are obtained as 10% particle diameter (D10), 50% particle diameter (D50; median particle diameter) and 90% particle diameter (D90) (μm), respectively. The particle size description value a is obtained from the obtained D10, D50, D90.

(2) Thickness of the particles

The thickness of the particles was measured using a scanning electron microscope and the following method was used. After the particles were adhered to the carbon double-sided tape, the surface of the particles was covered with platinum particles by vapor deposition, and the thus obtained sample was observed under conditions of an acceleration voltage of 1.0kV and a magnification of 2000 times, and the thickness was measured for any particles.

< preparation of calcium myristate particles >

Calcium myristate particles having a median particle diameter (d50) =6.7 μm, d10=4.1 μm, d90=11.0 μm, a particle size description value a=1.0, and a thickness average of the particles of 596nm were prepared by the following method.

250g of myristic acid (NAA-142 manufactured by Nikko Co., ltd.), 1.25g of polyethylene glycol/polypropylene glycol/block ether (manufactured by Nikko Co., ltd., trade name: pronon # 104) and 2500g of water were put into a 3L separable flask, and the temperature was raised to 90 ℃. Then, 87.0g of a 48 mass% aqueous sodium hydroxide solution was added thereto, and the mixture was stirred at the same temperature (90 ℃) for 1 hour to obtain an aqueous sodium myristate solution. Thereafter, 174.5g of a 35 mass% aqueous calcium chloride solution was added dropwise to a sodium myristate salt aqueous solution in a state of being kept at 90 ℃ for 30 minutes [ dropping acceleration: 0.39 (mol/mol) ]. After the completion of the dropwise addition, the mixture was kept at 90℃and stirred for 10 minutes to effect aging. 1500g of water was added to the obtained mixed fatty acid calcium salt aqueous slurry, and the mixture was cooled to 65℃or lower. Thereafter, filtration was performed by a suction filter, washing with 1000g of water was performed 2 times, and the obtained cake was dried at 80 ℃ by using a ventilated shelf dryer and crushed by a mill to obtain calcium myristate particles.

< magnesium myristate >

For comparison, magnesium myristate (manufactured by Taiping chemical industry Co., ltd.) having a median particle diameter of 17 μm was prepared.

< mica >

In contrast, mica having a median particle diameter of 20 μm was prepared.

< examples 1 to 4, comparative examples 1 to 7: eye shadow

Eye shadow having the composition shown in table 1 was prepared according to the following production method.

The manufacturing method comprises the following steps: the powder component was stirred with a henschel mixer (registered trademark) to obtain a component a. The oily component or the like as the binder is heated while stirring, and dissolved to obtain component B. Subsequently, component B was slowly added while stirring component A to obtain component C. The following wet mixing was performed: to component C, a volatile solvent was added, and the mixture was stirred to prepare a slurry. The following wet forming was performed: the slurry is filled into a container, and the solvent is removed by vacuum suction and a drying process to solidify the powder.

< evaluation method >

Impact resistance:

the 3 cosmetic test pieces of the examples and comparative examples were dropped from a height of 30 cm. The number of drops until chipping, cracking, peeling, etc. occurred was measured for the test body after the drop. The minimum number of times of each test piece is shown in table 1. If it exceeds 30 times, the impact resistance is good.

TABLE 1

As shown in table 1, the eye shadow of the example containing specific calcium myristate particles and specific polar oil of IOB was blended with a large amount of the brightening powder, but the impact resistance was excellent and the hardness was also good. On the other hand, the eye shadow of the comparative example did not give good impact resistance.

< examples 5 to 6, comparative examples 8 to 10: eye shadow

An eye shadow was produced in the same manner as in example 1, except that the compositions shown in table 2 were used, and impact resistance was evaluated in the same manner as in example 1.

The results are shown in Table 2.

TABLE 2

As shown in table 2, the eye shadow of the example containing specific calcium myristate particles and specific polar oil of IOB was blended with a large amount of the brightening powder, but the impact resistance was excellent. On the other hand, the eye shadow of the comparative example did not give good impact resistance.

While the invention has been described in detail or with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof. The present application is based on japanese patent application (japanese patent application 2020-033876) filed on 28 months of 2020, the contents of which are incorporated herein by reference.

Claims

1. A powdery solid cosmetic comprising fatty acid calcium salt particles having 12 to 22 carbon atoms of fatty acid and an oily component,

the oily component comprises a polar oil having an IOB of 0.1 to 0.6,

the fatty acid calcium salt particles have a median particle diameter of 4.0 to 15.0 μm, a particle size description value A represented by the following formula (1) satisfies the relationship of A.ltoreq.2.0, and a thickness average of 350 to 800nm,

particle size description A= (D90-D10)/D50 … type (1)

Wherein D50 is more than or equal to 4.0 and less than or equal to 15.0,

d10: 10% cumulative particle diameter in volume basis of fatty acid calcium salt particles in μm

D50: median particle diameter in volume basis of fatty acid calcium salt particles in μm

D90: 90% of the particles of fatty acid calcium salt have a cumulative particle diameter in μm on a volume basis.

2. The powder solid cosmetic according to claim 1, further comprising 30% by mass or more of a shiny powder.

3. The powder solid cosmetic according to claim 2, wherein the glittering powder has an average particle diameter of 15 to 200 μm.

4. A powder solid cosmetic according to any one of claims 1 to 3, which has a surface provided with a decorative pattern of a concave-convex shape.