JP2024021772A - Cosmetic powder material, method for producing cosmetic powder material, and cosmetics - Google Patents

Abstract

To provide a cosmetic powder material that offers superior smoothness, spreadability, adherence, a natural look, and skin-blurring effects, also capable of reducing occurrence of glossiness.SOLUTION: A cosmetic powder material includes flaky base powder, a surface of which is coated with inorganic particles. The inorganic particles are calcium carbonate particles, which have a bivalent or trivalent metal salt as their core. The bivalent or trivalent metal salt is an aluminum salt. A content of the bivalent or trivalent metal salt is 0.010-0.10 pts.wt. relative to 100 pts.wt. of the flaky base powder. The calcium carbonate particles have a particle size of 0.20-5 μm. The calcium carbonate particles have a coverage of 10-50 wt.%.SELECTED DRAWING: None

Description

The present invention relates to a powder material for cosmetics comprising a flaky base powder whose surface is coated with inorganic particles, a method for producing the powder material for cosmetics, and a cosmetic containing the powder for cosmetics.

Conventionally, powder foundations and other cosmetics have been formulated with flaky powders such as sericite, mica, and talc as basic raw materials in order to provide a smooth feel and appropriate luster to the skin.

Cosmetics containing these flaky powders may have problems such as insufficient smoothness, spreadability, adhesion, natural finish, and skin blurring effect when applied to the skin. In addition, there is a risk that problems such as shine may occur in the cosmetic after application, making it difficult to meet detailed requirements for cosmetics.

In order to deal with this problem, for example, the surface of flaky base powder is coated with calcium carbonate particles using a chemical reaction such as a reaction between a carbonate and a calcium salt, or a reaction between a calcium salt and carbon dioxide gas. Powder materials for cosmetics have been proposed (see Patent Documents 1 and 2).

For example, by mixing flaky base powder and calcium carbonate powder (particles) in a wet or dry manner, the calcium carbonate powder can be physically attached to the surface of the flaky base powder using van der Waals force. A powder material for cosmetics has been proposed (see Patent Document 3).

Japanese Patent Application Publication No. 2001-98185 Japanese Patent Application Publication No. 2003-137544 Special Publication No. 2000-506205

When the surface of flaky base powder is coated with calcium carbonate particles using a chemical reaction as described in Patent Documents 1 and 2, and when the surface of flaky base powder is coated with calcium carbonate particles as described in Patent Document 3. If calcium particles are physically attached, there is a risk that the smoothness, spreadability, adhesion, natural finish, and skin blurring effect may not be sufficiently achieved, and the generation of shine may not be sufficiently suppressed. There is a possibility that you will not be able to do so.

The present invention was made in view of the above circumstances, and provides a powder for cosmetics that has excellent smoothness, good spreadability, adhesion, natural finish, and skin blurring effect, and can suppress the generation of shine. The object of the present invention is to provide a material, a method for producing a powder material for cosmetics, and a cosmetic containing the powder for cosmetics.

The characteristic structure of the powder material for cosmetics according to the present invention for solving the above problems is as follows:
A powder material for cosmetics comprising a flaky base powder whose surface is coated with inorganic particles,
The inorganic particles are calcium carbonate particles having a core of a divalent or trivalent metal salt.

According to the powder material for cosmetics having this configuration, by coating the surface of the flaky base powder with calcium carbonate particles having a core of divalent or trivalent metal salt, the carbon dioxide that adheres to the surface of the flaky base powder is The particle diameter of the calcium particles becomes an appropriate size, and the optical properties of the powder material for cosmetics become appropriate. As a result, the powder material for cosmetics has excellent smoothness, spreadability, adhesion, natural finish, and skin blurring effect, and can suppress the generation of shine.

In the powder material for cosmetics according to the present invention,
The divalent or trivalent metal salt is preferably an aluminum salt.

According to the powder material for cosmetics having this structure, by using an aluminum salt as a divalent or trivalent metal salt, it becomes chemically and physically stable, is gentle on the skin, and is competitive in terms of cost. It can be used as a powder material for cosmetics.

In the powder material for cosmetics according to the present invention,
The amount of the divalent or trivalent metal salt blended is preferably 0.010 to 0.10 parts by weight based on 100 parts by weight of the flaky base powder.

According to the powder material for cosmetics having this configuration, by setting the blending amount of the divalent or trivalent metal salt within the above range, calcium carbonate particles with the metal salt as the core can easily grow, and the flaky base powder The particle size of the calcium carbonate particles adhering to the surface also becomes more appropriate. This can improve smoothness, spreadability, adhesion, natural finish, and skin blurring effect, and can further suppress the occurrence of shine.

In the powder material for cosmetics according to the present invention,
The calcium carbonate particles preferably have a particle size of 0.20 to 5 μm.

According to the powder material for cosmetics having this configuration, by setting the particle diameter of the calcium carbonate particles within the above range, the calcium carbonate particles easily adhere to the surface of the flaky base powder. This can improve smoothness, spreadability, adhesion, natural finish, and skin blurring effect, and can further suppress the occurrence of shine.

In the powder material for cosmetics according to the present invention,
The coating amount of the calcium carbonate particles is preferably 10 to 50% by weight.

According to the powder material for cosmetics with this structure, by setting the coating amount of calcium carbonate particles within the above range, the flaky base powder is appropriately exposed, resulting in smoothness, good spreadability, adhesion, and a natural finish. , and the effect of blurring the skin can be enhanced, and generation of shine can be further suppressed.

In the powder material for cosmetics according to the present invention,
It is preferable that the following conditions are met:
(Conditions) A silicone oil paste is prepared by dispersing the cosmetic powder material in a silicone oil containing 20% by weight, and the silicone oil paste is spread on a glass plate to a thickness of 0.025 mm using an applicator. When applied, the applied silicone oil paste has a total light transmittance of 80% or more and a haze value of 40% or more.

According to the powder material for cosmetics having this configuration, by satisfying the above conditions, the optical properties of the powder material for cosmetics become more appropriate. Thereby, generation of shine can be further suppressed.

The characteristic configuration of the method for producing powder material for cosmetics according to the present invention to solve the above problems is as follows:
A method for producing a powder material for cosmetics comprising coating the surface of a flaky base powder with inorganic particles, the method comprising:
a metal salt addition step of adding and mixing a divalent or trivalent metal salt to the suspension while stirring the suspension containing the flaky base powder and water;
By adding an aqueous calcium salt solution and an aqueous carbonate solution to the mixed solution obtained in the metal salt addition step while stirring the mixed solution, the divalent or trivalent metal salt is added to the surface of the flaky base powder. a precipitation step of precipitating calcium carbonate particles with a core of
The goal is to include the following.

According to the method for producing a powder material for cosmetics having the present structure, as described above, it has excellent smoothness, good spreadability, adhesion, natural finish, and skin blurring effect, while suppressing the generation of shine. A powder material for cosmetics can be produced.

In the method for producing powder material for cosmetics according to the present invention,
In the metal salt addition step, the amount of the divalent or trivalent metal salt added is preferably set to 0.010 to 0.10 parts by weight based on 100 parts by weight of the flaky base powder.

According to the method for producing a powder material for cosmetics having the present structure, by setting the amount of divalent or trivalent metal salt added within the above range, calcium carbonate particles with the metal salt as a core can easily grow and become flaky. The particle diameter of the calcium carbonate particles adhering to the surface of the base powder also becomes a more appropriate size. As a result, it is possible to produce a powder material for cosmetics that can improve smoothness, spreadability, adhesion, natural finish, and skin blurring effect, and can further suppress the occurrence of shine. .

The characteristic structure of the cosmetic according to the present invention for solving the above problems is as follows:
The reason lies in the fact that the above-mentioned powder material for cosmetics is blended.

According to the cosmetic composition of this structure, by blending the above-mentioned powder material for cosmetics, it has excellent smoothness, good spreadability, adhesion, natural finish, and effect of blurring the skin, while generating shine. It becomes a cosmetic product with suppressed

The powder material for cosmetics of the present invention is obtained by coating the surface of a flaky base powder with inorganic particles. Regarding such powder materials for cosmetics, the following facts were discovered by the present inventors.
(1) When a calcium salt and a carbonate are reacted to coat the surface of a flaky base powder with calcium carbonate particles, the particle size of the calcium carbonate particles covering the surface of the flaky base powder is a specific particle. As the diameter increases, the slipperiness, elongation, adhesion, and natural finish deteriorate, and the optical properties also deteriorate, which tends to cause shine.
(2) When coating the surface of a flaky base powder with calcium carbonate particles, the appropriate particle size is determined to maximize smoothness, spreadability, adhesion, natural finish, skin blurring effect, and optical properties. exist.
(3) As the production scale increases, the particle size of calcium carbonate particles increases.
(4) When coating the surface of flaky base powder with calcium carbonate particles, by adding a divalent or trivalent metal salt before reacting the carbonate with the calcium salt, divalent or trivalent metal salt can be added. By generating calcium carbonate particles in this way, the particle diameter of the calcium carbonate particles becomes an appropriate size, and the optical properties of the powder material for cosmetics can be improved. .

The present invention was completed based on the above facts and as a result of intensive research. EMBODIMENT OF THE INVENTION Hereinafter, the embodiment of the powder material for cosmetics, the manufacturing method of the powder material for cosmetics, and the cosmetics of this invention is described in detail. However, the present invention is not intended to be limited to the embodiments and examples described below.

[Powder material for cosmetics]
The powder material for cosmetics is made by coating the surface of flaky base powder with inorganic particles.

<Flake-like base powder>
The flaky base powder is a powder that serves as a base material for a powder material for cosmetics.

The size of the flaky base powder is specified by the overall length, thickness, and aspect ratio. Here, the total length of the flaky base powder means the maximum length of the long axis when the plate-like base powder is viewed from above. Thickness means the maximum length of the plate-shaped base powder when viewed from the side. Aspect ratio means the ratio between the total length and thickness of a plate-shaped crystal. The total length and thickness of the flaky base powder can be easily determined by arbitrarily extracting a plurality of crystal grains (for example, 10) from an electron micrograph and taking the average value of the measured values of the total length and thickness of each crystal grain. can be measured. The total length of the flaky base powder is preferably set to 0.1 to 50 μm, more preferably 0.5 to 20 μm. Further, the thickness is preferably set to 0.005 to 0.625 μm, more preferably 0.01 to 0.285 μm. Therefore, the aspect ratio is preferably 20-80, more preferably 50-70.

Examples of the flaky base powder include sericite, mica (natural mica, synthetic mica), talc, and kaolin. Among these, sericite and mica are preferred because they can be easily coated with calcium carbonate particles having an appropriate particle size. One type of flaky base powder can be used alone, but a mixture of two or more types can also be used.

<Inorganic particles>
The inorganic particles coated on the surface of the flaky base powder are calcium carbonate particles having a core of a divalent or trivalent metal salt. Hereinafter, in this specification, the divalent or trivalent metal salt that forms the core of the calcium carbonate particles will be referred to as a "first metal salt."

Examples of the first metal salt include zinc salt, magnesium salt, iron (trivalent) salt, aluminum salt, and the like. Among these, aluminum salts are preferable in view of the fact that the product is easily precipitated in water by reaction with carbonate, and thus easily forms the nucleus of calcium carbonate particles.

By using an aluminum salt as the first metal salt, the powder material for cosmetics can be made chemically and physically stable, gentle on the skin, and competitive in terms of cost.

The blending amount of the first metal salt is preferably 0.010 to 0.10 parts by weight, more preferably 0.02 to 0.05 parts by weight, based on 100 parts by weight of the flaky base powder.

By setting the blending amount of the first metal salt within the above range, calcium carbonate particles with the first metal salt as a nucleus can easily grow, and the particle size of the calcium carbonate particles adhering to the surface of the flaky base powder can also be reduced. A more appropriate size. This can improve smoothness, spreadability, adhesion, natural finish, and skin blurring effect, and can further suppress the occurrence of shine.

The particle diameter of the calcium carbonate particles having the first metal salt as a core is preferably 0.20 to 5 μm, more preferably 1 to 3 μm, considering that they can exhibit a high light diffusion effect. By setting the particle size of the calcium carbonate particles within the above range, the calcium carbonate particles easily adhere to the surface of the flaky base powder. This can improve smoothness, spreadability, adhesion, natural finish, and skin blurring effect, and can further suppress the occurrence of shine.

The amount of calcium carbonate particles coated is preferably 10 to 50% by weight, more preferably 20 to 30% by weight. The amount of calcium carbonate particles coated is % by weight when the entire powder material for cosmetics is 100% by weight.

By setting the coating amount of calcium carbonate particles within the above range, the flaky base powder is appropriately exposed, so smoothness, spreadability, adhesion, natural finish, and skin blurring effect can be enhanced. Moreover, generation of shine can be further suppressed.

The cosmetic powder material of this embodiment preferably satisfies the following conditions:
(Conditions) Prepare a silicone oil paste by dispersing cosmetic powder material in silicone oil to contain 20% by weight, and apply this silicone oil paste to a thickness of 0.025 mm on a glass plate using an applicator. When applied in this manner, the applied silicone oil paste has a total light transmittance of 80% or more and a haze value of 40% or more, preferably 50% or more. As the silicone oil, KF-96-2000CS (manufactured by Shin-Etsu Chemical Co., Ltd.) is used.

By satisfying the above conditions, the optical properties of the cosmetic powder material become more appropriate. Thereby, generation of shine can be further suppressed.

[Method for producing powder material for cosmetics]
A powder material for cosmetics is manufactured by performing a metal salt addition step and a precipitation step. Each step will be explained below.

(Metal salt addition process)
In the metal salt addition step, a divalent or trivalent metal salt is added and mixed with stirring to a suspension of the flaky base powder described above in water. At this time, a portion of a carbonate aqueous solution to be described later may be added. Hereinafter, in this specification, the divalent or trivalent metal salt used in the metal salt addition step will be referred to as a "second metal salt."

For example, an aqueous carbonate solution is added with stirring to a dispersion (suspension) in which a flaky base powder is dispersed (suspended) in water, and a water-soluble second metal salt is further added with stirring. . As a result, the carbonate and the second metal salt react, and a water-insoluble first metal salt (for example, aluminum carbonate) is generated. The first metal salt becomes the core of calcium carbonate particles generated in the precipitation step described below.

The content of the flaky base powder in the suspension is preferably 5 to 30 parts by weight, more preferably 5 to 20 parts by weight, based on 100 parts by weight of water. By setting the content of the flaky base powder in the suspension within the above range, the concentration of the flaky base powder becomes appropriate.

The second metal salt is not particularly limited as long as it is water-soluble. Examples of the second metal salt include zinc salt, magnesium salt, iron (trivalent) salt, aluminum salt, and the like. Among these, aluminum salt is preferable because the first metal salt is easily precipitated in water in the precipitation step described later and is easy to form the nucleus of the calcium carbonate particles to be generated. Examples of the aluminum salt include aluminum chloride, aluminum nitrate, and the like. Among these, aluminum nitrate is preferable because it makes it easier to reduce the particle size of calcium carbonate particles.

In the metal salt addition step, a portion of the carbonate to be added in the precipitation step described later may be added. As will be described later, examples of the carbonate include sodium carbonate and potassium carbonate, but sodium carbonate is preferred because it is easily soluble in water. Furthermore, by adding sodium carbonate before the precipitation step, the pH at the time of initial formation of calcium carbonate particles in the precipitation step becomes high (becomes alkaline), so that the formation of calcium carbonate particles becomes easier to stabilize.

The amount of the second metal salt added (that is, the amount of the second metal salt added in the mixed liquid) is preferably set to 0.010 to 0.10 parts by weight based on 100 parts by weight of the flaky base powder. , more preferably set at 0.02 to 0.05 parts by weight. By setting the amount of the second metal salt added within the above range, calcium carbonate particles with the first metal salt as a nucleus can easily grow, and the particle size of the calcium carbonate particles adhering to the surface of the flaky base powder can also be reduced. A more appropriate size. As a result, it is possible to produce a powder material for cosmetics that can improve smoothness, spreadability, adhesion, natural finish, and skin blurring effect, and can further suppress the occurrence of shine. .

(Precipitation process)
In the precipitation step, a calcium salt aqueous solution and a carbonate aqueous solution are added to the mixed solution (suspension) obtained in the metal salt addition step while stirring, so that a first layer is deposited on the surface of the flaky base powder. Calcium carbonate particles with metal salts as cores are precipitated.

For example, a calcium salt aqueous solution and a carbonate aqueous solution are added over a predetermined period of time while stirring the mixed liquid (suspension) obtained in the metal salt addition step. As a result, on the surface of the flaky base powder, the carbonate and the calcium salt react to produce calcium carbonate, and during this production, calcium carbonate particles are formed with the water-insoluble first metal salt as a core. It is formed. In this way, the surface of the flaky base powder is coated with calcium carbonate particles having the first metal salt as a core.

Examples of calcium salts include calcium chloride, calcium hydroxide, etc., but calcium chloride is preferred because it is easily soluble in water.

Examples of the carbonate added in the precipitation step include sodium carbonate and potassium carbonate, but sodium carbonate is preferred because it is easily soluble in water. Furthermore, by adding sodium carbonate in the precipitation step, the salt produced as a by-product during the reaction with the calcium salt becomes a sodium salt (for example, sodium chloride), making it easy to dispose of.

The temperature during the reaction between the calcium salt and the carbonate is preferably 20 to 60°C, and more preferably 20 to 30°C (near room temperature) because it is easy to control the particle size of the calcium carbonate particles coated. .

The calcium salt aqueous solution and the carbonate aqueous solution are preferably added (dropwise) at the same time. Further, the addition time when adding at the same time can be appropriately set depending on the particle size of the calcium carbonate particles to be produced, the production scale, etc. As the addition time (dropping time) becomes shorter, the particle size of the calcium carbonate particles tends to become larger, while as the addition time becomes longer, the particle size of the calcium carbonate particles tends to become smaller. Considering this point, the addition time is preferably 20 to 50 minutes, more preferably 20 to 30 minutes. By setting the addition time within the above range, the particle size of the calcium carbonate particles to be coated can be easily adjusted to 0.20 to 5 μm.

The concentration of the calcium salt aqueous solution and the concentration of the carbonate aqueous solution can be set as appropriate.

After the above metal salt addition step and precipitation step, the obtained product may be filtered and washed with water, dried in a heated atmosphere (for example, 100° C.) for 24 hours or more, and then pulverized with an atomizer or the like. .

By performing the metal salt addition step and the precipitation step, the surface of the flaky base powder can be coated with calcium carbonate particles having the first metal salt as a core. The calcium carbonate particles produced in this way are calcite crystals having a polyhedral shape, and are not fixed to the surface of the flaky base powder, but are thought to be bonded together by van der Waals forces.

According to the method for producing a powder material for cosmetics according to the present embodiment, as described above, the generation of shine is suppressed while being excellent in smoothness, spreadability, adhesion, natural finish, and skin blurring effect. Powder materials for cosmetics can be produced.

[Cosmetics]
The cosmetic of this embodiment contains the above-mentioned cosmetic powder material.

According to the cosmetic of this embodiment, by blending the above-mentioned powder material for cosmetics, it has excellent smoothness, good spreadability, adhesion, natural finish, and skin blurring effect, and has a shiny appearance. The result is a cosmetic product with suppressed generation.

The amount of cosmetic powder material blended in the cosmetic is preferably 50 to 90% by weight, more preferably 70 to 85% by weight. By setting the blending amount of the powder material for cosmetics within the above range, smoothness, spreadability, adhesion, natural finish, and skin blurring effect can be enhanced, and the generation of shine can be further suppressed. It is possible.

The cosmetics of the present invention include ingredients normally used in cosmetics, such as powders other than the powder materials for cosmetics mentioned above, surfactants, oils, gelling agents, polymers, beauty ingredients, moisturizers, pigments, and preservatives. Agents, fragrances, etc. may be added within a range that does not impair the effects of the present invention.

Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

[Raw materials used]
The raw materials used are shown below.
・Sericite (FSE-S, manufactured by Sanshin Mining Co., Ltd.)
・Mica (YW-2300X, manufactured by Yamaguchi Mica Co., Ltd.)
・Sodium carbonate (soda ash light, manufactured by Tokuyama Co., Ltd.)
・Calcium chloride (granular calcium chloride, manufactured by Tokuyama Co., Ltd.)
・Aluminum nitrate nonahydrate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.)
・Calcium carbonate particles (Luminous, particle size 0.1-1 μm, manufactured by Maruo Calcium Co., Ltd.)
・Water (purified water)

[Evaluation of powder materials for cosmetics]
(Example 1)
While stirring 6 L of water, 1000 g of sericite was dispersed in the water. While stirring the resulting dispersion, 107.6 g of a 10% by weight aqueous sodium carbonate solution was added to the dispersion, and then 0.33 g of aluminum nitrate nonahydrate (second metal salt) (sericite 100 0.033 parts by weight) and stirred for 10 minutes or more. While stirring the resulting mixed solution, 3270 g of a 10% by weight aqueous sodium carbonate solution and 3170 g of a 12.6% by weight calcium chloride aqueous solution were simultaneously added dropwise over 30 minutes, and after completion of the dropping, Stirred for 20 minutes. After stirring, the obtained product is filtered, washed with water, dried at 100°C for 24 hours or more, and then crushed with an atomizer to form aluminum carbonate (first metal salt) on the surface of the sericite. A powder material for cosmetics according to Example 1 was obtained, which was coated with 24.1% by weight of calcium carbonate particles having a core of .

(Example 2)
While stirring 1.6 L of water, 300 g of mica (mica powder) was dispersed in the water. While stirring the resulting dispersion, 32.3 g of a 10% by weight aqueous sodium carbonate solution was added to the dispersion, and then 0.1 g of aluminum nitrate nonahydrate (second metal salt) was added (mica 100% by weight). 0.033 parts by weight) and stirred for 10 minutes or more. While stirring the resulting mixed solution, 981 g of a 10% by weight aqueous sodium carbonate solution and 951.1 g of a 12.6% by weight calcium chloride aqueous solution were simultaneously dropped over 20 minutes, and the dropping was completed. After that, the mixture was stirred for 20 minutes. After stirring, the obtained product is filtered, washed with water, dried at 100°C for 24 hours or more, and then crushed with an atomizer to coat the surface of the mica with aluminum carbonate (first metal salt). A powder material for cosmetics of Example 2 was obtained, which was coated with 24.1% by weight of calcium carbonate particles as cores.

(Example 3)
In the same manner as in Example 1, sericite was dispersed in water, and then an aqueous sodium carbonate solution and aluminum nitrate nonahydrate (second metal salt) were added and stirred for 10 minutes or more. While stirring the resulting mixed solution, an aqueous sodium carbonate solution and an aqueous calcium chloride solution having the same concentration and the same amount as in Example 1 were simultaneously added dropwise over 50 minutes, and after the addition was completed, the mixture was stirred for 20 minutes. After stirring, the obtained product is filtered, washed with water, dried at 100°C for 24 hours or more, and then crushed with an atomizer to form aluminum carbonate (first metal salt) on the surface of the sericite. A powder material for cosmetics according to Example 3 was obtained, which was coated with 24.1% by weight of calcium carbonate particles having a core of .

(Example 4)
Mica was dispersed in water in the same manner as in Example 2, and then an aqueous sodium carbonate solution of the same concentration and amount as in Example 2 was added, and then aluminum nitrate nonahydrate (second metal salt) was added to 0. .03g (0.010 parts by weight per 100 parts by weight of mica) was added and stirred for 10 minutes or more. While stirring the resulting mixed solution, a sodium carbonate aqueous solution and a calcium chloride aqueous solution having the same concentration and the same amount as in Example 2 were simultaneously added dropwise over 20 minutes, and after the completion of the dropwise addition, the solution was added dropwise for 20 minutes. Stirred. After stirring, the obtained product is filtered, washed with water, dried at 100°C for 24 hours or more, and then crushed with an atomizer to coat the surface of the mica with aluminum carbonate (first metal salt). A powder material for cosmetics of Example 4 was obtained, which was coated with 24.1% by weight of calcium carbonate particles as cores.

(Example 5)
Mica was dispersed in water in the same manner as in Example 2, and then an aqueous sodium carbonate solution of the same concentration and amount as in Example 2 was added, and then aluminum nitrate nonahydrate (second metal salt) was added to 0. .3g (0.10 parts by weight per 100 parts by weight of mica) was added and stirred for 10 minutes or more. While stirring the resulting mixed solution, a sodium carbonate aqueous solution and a calcium chloride aqueous solution having the same concentration and the same amount as in Example 2 were simultaneously added dropwise over 20 minutes, and after the completion of the dropwise addition, the solution was added dropwise for 20 minutes. Stirred. After stirring, the obtained product is filtered, washed with water, dried at 100°C for 24 hours or more, and then crushed with an atomizer to coat the surface of the mica with aluminum carbonate (first metal salt). A powder material for cosmetics of Example 5 was obtained, which was coated with 24.1% by weight of calcium carbonate particles as cores.

(Example 6)
While stirring 600 g of water, 112.8 g of sericite was dispersed in the water. While stirring the resulting dispersion, 24.28g of a 10% by weight aqueous sodium carbonate solution was added to the dispersion, and then 0.038g of aluminum nitrate nonahydrate (second metal salt) was added (sericite 100). 0.034 parts by weight) and stirred for 10 minutes or more. While stirring the resulting mixture, 737.72 g of a 10% by weight aqueous sodium carbonate solution and 715.2g of a 12.6% by weight calcium chloride aqueous solution were simultaneously dropped over 20 minutes. After the dropwise addition was completed, the mixture was stirred for 20 minutes. After stirring, the obtained product is filtered, washed with water, dried at 100°C for 24 hours or more, and then crushed with an atomizer to form aluminum carbonate (first metal salt) on the surface of the sericite. A powder material for cosmetics of Example 6 was obtained, which was coated with 48.2% by weight of calcium carbonate particles having a core of .

(Example 7)
In the same manner as in Example 6, sericite was dispersed in water, and then 6.07 g of a 10% by weight aqueous sodium carbonate solution was added, followed by 0.038 g of aluminum nitrate nonahydrate (second metal salt). (0.034 parts by weight based on 100 parts by weight of sericite) was added and stirred for 10 minutes or more. To this mixed solution, 184.43 g of a 10% by weight aqueous sodium carbonate solution and 178.8 g of a 12.6% by weight aqueous calcium chloride solution were simultaneously dropped over 20 minutes, and after the dropwise addition was completed, the mixture was stirred for 20 minutes. After stirring, the obtained product is filtered, washed with water, dried at 100°C for 24 hours or more, and then crushed with an atomizer to form aluminum carbonate (first metal salt) on the surface of the sericite. A powder material for cosmetics of Example 7 was obtained, which was coated with 12.1% by weight of calcium carbonate particles having a core of .

(Comparative example 1)
In the same manner as in Example 1, sericite was dispersed in water, then an aqueous sodium carbonate solution was added, and the mixture was stirred for 10 minutes or more. While stirring the resulting mixed solution, a sodium carbonate aqueous solution and a calcium chloride aqueous solution having the same concentration and the same amount as in Example 1 were simultaneously added dropwise over 20 minutes, and after the dropwise addition was completed, the mixture was stirred for 20 minutes. After stirring, the obtained product is filtered, washed with water, dried at 100°C for 24 hours or more, and then crushed with an atomizer to form 24.1% by weight of calcium carbonate particles on the surface of sericite. A coated powder material for cosmetics of Comparative Example 1 was obtained. In the cosmetic powder material of Comparative Example 1, calcium carbonate particles without a nucleus were attached to the surface of sericite.

(Comparative example 2)
Mica was dispersed in water in the same manner as in Example 2, and then an aqueous sodium carbonate solution was added and stirred for 10 minutes or more. While stirring the resulting mixed solution, an aqueous sodium carbonate solution and an aqueous calcium chloride solution having the same concentration and the same amount as in Example 2 were simultaneously added dropwise over 20 minutes, and after the dropwise addition was completed, the mixture was stirred for 20 minutes. After stirring, the obtained product is filtered, washed with water, dried at 100°C for 24 hours or more, and then pulverized with an atomizer, resulting in 24.1% by weight of calcium carbonate particles on the surface of the mica. A coated powder material for cosmetics of Comparative Example 2 was obtained. In the powder material for cosmetics of Comparative Example 2, calcium carbonate particles without nuclei were attached to the surface of mica.

(Comparative example 3)
While stirring 1.3 L of water, 112.8 g of sericite was dispersed in the water, and then calcium carbonate particles having a particle size of 0.1 to 1 μm were added and stirred for 20 minutes. After stirring, the resulting mixture is filtered, washed with water, dried at 100°C for 24 hours or more, and pulverized with an atomizer, resulting in a coating of 24.1% by weight of calcium carbonate particles without nuclei. A powder material for cosmetics of Comparative Example 3 was obtained.

(Comparative example 4)
Mica was dispersed in water in the same manner as in Example 2. While stirring the resulting dispersion, an aqueous sodium carbonate solution having the same concentration and amount as in Example 2 was added, and then 0.027 g of aluminum nitrate nonahydrate (per 100 parts by weight of mica) was added to the dispersion. (0.009 parts by weight) and stirred for 10 minutes or more. While stirring the resulting mixed solution, an aqueous sodium carbonate solution and an aqueous calcium chloride solution having the same concentration and the same amount as in Example 2 were simultaneously added dropwise over 20 minutes, and after the dropwise addition was completed, the mixture was stirred for 20 minutes. After stirring, the obtained product is filtered, washed with water, dried at 100°C for 24 hours or more, and then pulverized with an atomizer, resulting in 24.1% by weight of calcium carbonate particles on the surface of the mica. A coated powder material for cosmetics of Comparative Example 4 was obtained. In the powder material for cosmetics of Comparative Example 4, a very small amount of aluminum carbonate particles were attached to the surface of the mica along with calcium carbonate particles, and the calcium carbonate particles had aluminum carbonate (first metal salt) as a core. It wasn't something.

(Comparative example 5)
Mica was dispersed in water in the same manner as in Example 2. While stirring the resulting dispersion, an aqueous sodium carbonate solution of the same concentration and amount as in Example 2 was added, and then 0.33 g of aluminum nitrate nonahydrate (per 100 parts by weight of mica) was added to the dispersion. (0.11 parts by weight) and stirred for 10 minutes or more. While stirring the resulting mixed solution, an aqueous sodium carbonate solution and an aqueous calcium chloride solution having the same concentration and the same amount as in Example 2 were simultaneously added dropwise over 20 minutes, and after the dropwise addition was completed, the mixture was stirred for 20 minutes. After stirring, the obtained product is filtered, washed with water, dried at 100°C for 24 hours or more, and then pulverized with an atomizer, resulting in 24.1% by weight of calcium carbonate particles on the surface of the mica. A coated powder material for cosmetics of Comparative Example 5 was obtained. In the cosmetic powder material of Comparative Example 5, aluminum carbonate particles were attached to the mica surface together with calcium carbonate particles, and the calcium carbonate particles did not have aluminum carbonate (first metal salt) as their core. Ta.

The total light transmittance and haze value of the cosmetic powder materials of Examples 1 to 7 and Comparative Examples 1 to 5 were measured as follows, and the carbon dioxide adhering to the surface of sericite or mica was measured as follows. The particle diameter of calcium particles was measured and evaluated. In addition, untreated sericite was used as the powder material for cosmetics in Reference Example 1, and untreated mica was used as the powder material for cosmetics in Reference Example 2, and their total light transmittance and haze value were measured.

(Measurement of total light transmittance and haze value)
In order to confirm the effect of increasing skin transparency and naturally blurring effect, the powder materials for cosmetics of Examples 1 to 7, Comparative Examples 1 to 5, and Reference Examples 1 to 2 were used as measurement samples to measure total light transmission. The ratio and haze value were measured respectively. Specifically, first, silicone oil (KF-96-2000CS, manufactured by Shin-Etsu Chemical Co., Ltd.) and the measurement sample were mixed at a weight ratio of 4:1 (the weight ratio of silicone oil to measurement sample was 4:1). and sufficiently stirred with an automatic Huber muller (No. 546, manufactured by Yasuda Seiki Seisakusho Co., Ltd.) to obtain a paste in which the measurement sample was dispersed in silicone oil. The obtained paste was spread (coated) on a glass plate using an applicator to a film thickness of 0.025 mm (25 μm), and then the glass plate coated with the paste was measured with a haze meter (HM-150N). (manufactured by Murakami Color Research Institute Co., Ltd.), the total light transmittance and haze value were measured at four arbitrary locations, and the average value was calculated. The results are shown in Table 1.

(Measurement of particle diameter of calcium carbonate particles coated on the surface of flaky base powder)
Calcium carbonate particles adhering to the surfaces of the cosmetic powder materials of Examples 1 to 7 and Comparative Examples 1 to 5 were photographed using SEM. Specifically, ten arbitrary calcium carbonate particles were photographed using SEM on the surface of each cosmetic powder material. The imaging magnification was set to 2000x. Then, the particle diameter of each calcium carbonate particle present on each surface was calculated by analyzing the obtained image using ImageJ (https://imagej.nih.gov/ij/index.html). After that, the average value of the 10 samples was calculated. The particle diameter of each calcium carbonate particle was determined by measuring its maximum diameter and minimum diameter, and using these as an average value. The results are shown in Table 1.

As a result of the above, in the cosmetic powder materials of Examples 1 to 7, the surface of the flaky base powder is coated with calcium carbonate particles having the first metal salt as a core, and the particle size of the calcium carbonate particles is was shown to be 0.20 to 5 μm. The cosmetic powder materials of Examples 1 to 7 were shown to have a high haze value (that is, excellent light diffusion performance) while maintaining a high total light transmittance.

On the other hand, in the cosmetic powder materials of Comparative Examples 1 to 2 and 4 to 5, the surface of the flaky base powder is coated with calcium carbonate particles, but the calcium carbonate particles are divalent or trivalent. It was shown that the particles were not based on a metal salt and had a particle size of less than 0.20 μm or more than 5 μm. In the cosmetic powder materials of Comparative Examples 1 to 2, 4 to 5, and Comparative Example 3, the calcium carbonate particles do not have the first metal salt as the core, and while the total light transmittance is high, It was shown that the haze value was low (that is, the light diffusion performance was poor).

In addition, in the cosmetic powder materials of Reference Examples 1 and 2, the surface of the flaky base powder is not coated with calcium carbonate particles, and while the total light transmittance is high, the haze value is low (i.e., the light It was shown that the diffusion performance was poor.

The results of Examples 1 to 7, Comparative Examples 1 to 5, and Reference Examples 1 to 2 above are specifically considered as follows.

When coating the surface of flaky base powder with calcium carbonate particles, as shown in Comparative Examples 1 and 2, it is not enough to simply react a carbonate (here, sodium carbonate) and a calcium salt (here, calcium chloride). , the particle size of the calcium carbonate particles produced cannot be controlled. When simply reacting in this manner, the formation of calcium carbonate particles is generally more likely to be promoted as the production scale becomes larger, resulting in an excessively large particle size of the calcium carbonate particles.

Therefore, before the reaction between the carbonate and the calcium salt, 0.33 parts by weight of a second metal salt (aluminum nitrate in this case) is added to 100 parts by weight of the flaky base powder. By generating calcium carbonate particles with the first metal salt derived from salt as the core, the calcium carbonate particles can be made to have the first metal salt (here, aluminum carbonate) as the core, and As shown in Examples 1 and 2, the particle size of calcium carbonate particles can be controlled to about 1 to 5 μm. In addition, as the amount of calcium carbonate particles coated increases or decreases (for example, increases or decreases from 20 to 30% by weight of the entire powder material for cosmetics), the calcium carbonate particles become coated with the first metal salt (here, Although the particle size of calcium carbonate particles tends to deviate from 0.20 to 5 μm, by adding a second metal salt before the reaction, calcium carbonate Even when the amount of particles coated is relatively large, the calcium carbonate particles can be made with the first metal salt as the core, and as shown in Examples 6 and 7, the calcium carbonate particles The particle size of the particles can be controlled to about 0.20 to 5 μm.

Examples 1 to 7 maintain high transmittance and have a high haze value compared to Reference Examples 1 to 2 in which the flaky base powder is not coated with calcium carbonate particles, but this is because It is thought that the particle size of the coated calcium carbonate particles is related. Comparing Example 1 using sericite as the flaky base powder and Comparative Examples 1 and 3, Example 1 has a higher haze value, and Example 2 using mica and Comparative Examples 2 and 4 have a higher haze value. , 5, Example 2 has a higher haze value. When these haze values are compared in relation to the particle size of the calcium carbonate particles, the haze value is highest when the particle size of the calcium carbonate particles is 2 μm or less, particularly in the range of 1 to 2 μm. This is thought to be because, when calcium carbonate particles are attached to the surface of flaky particles, the particle diameter of the calcium carbonate particles that most easily diffuses light is about 1 to 2 μm. From this, it is inferred that the haze value can be maximized by setting the particle size of the calcium carbonate particles to about 1 to 2 μm.

Even when the particle size of calcium carbonate particles is 1 μm or less as shown in Example 3, or 2 μm or more as in Examples 4 and 5, untreated products (uncoated products) of sericite and mica ), the haze value is increased compared to Reference Examples 1 and 2. On the other hand, when the particle size of the calcium carbonate particles is too large as in Comparative Examples 2, 4, and 5 (using mica), the haze value does not improve much compared to Reference Example 2, and Comparative Example 1 When the particle size of the calcium carbonate particles becomes too large, as in Example 1 (using sericite), the haze value tends to be lower than in Reference Example 1 (using sericite).

In Examples 1 and 2, by adding 0.033 parts by weight of the second metal salt to 100 parts by weight of the flaky base powder, it was possible to make the particle size of the calcium carbonate particles 1 to 2 μm. Become. As shown in Examples 1 to 2 and Examples 3 to 5, by adding the second metal salt in an amount of 0.010 to 0.10 parts by weight, the particle size of the calcium carbonate particles is reduced to 0. The haze value can be increased to 20 to 5 μm, and the haze value can be higher than that of untreated Reference Examples 1 to 2 and Comparative Examples 1 to 5 when comparing the same flaky base powders. On the other hand, in Comparative Example 4 in which 0.009 parts by weight of the second metal salt was added and Comparative Example 5 in which 0.11 parts by weight was added, the particle diameter of the calcium carbonate particles exceeded 5 μm, increasing the haze value. I can't. From this, when adding 0.010 to 0.10 parts by weight of aluminum nitrate to 100 parts by weight of flaky base powder, the particle size of the calcium carbonate particles can be optimized.

[Evaluation of cosmetics using powder materials for cosmetics]
Using the cosmetic powder materials of Examples 1 and 2, Comparative Examples 1 and 2, and Reference Examples 1 and 2, a powder foundation as a cosmetic was prepared based on the formulation shown in Table 2 and according to the manufacturing method below. We conducted various evaluations.

(Production method)
Components 1 to 7 in Table 2 were added to a mixer and mixed thoroughly, then component 8 was added and mixed thoroughly again. Next, 10 g of the obtained mixture was put into a container and pressed at a pressure of 5.5 MPa to obtain powder foundations of Examples 8 to 9, Comparative Examples 6 to 7, and Reference Example 3.

[evaluation]
The smoothness, spreadability, adhesion, and natural finish of the obtained powder foundation were evaluated by 10 pre-trained expert panelists as described below, and the average value of the 10 evaluation results was calculated. Calculated. The results are shown in Table 2.

(smoothness)
Powder foundation was applied to the hands and evaluated on a scale of 1 to 5 according to the criteria below.

・Judgment Criteria 5: Very smooth 4: Slightly smooth 3: Relatively smooth 2: Slightly squeaky 1: Squeaky

(Good elongation)
Powder foundation was applied to the hands and evaluated on a scale of 1 to 5 according to the criteria below.

・Judgment Criteria 5: Very good elongation 4: Slightly good elongation 3: Relatively good elongation 2: Slightly poor elongation 1: Poor elongation

(natural finish)
Powder foundation was applied to the hands and evaluated on a scale of 1 to 5 according to the criteria below.

・Judgment Criteria 5: Blends well into the skin 4: Blends into the skin 3: Relatively blends into the skin 2: Slightly powdery 1: Powdery

(Adhesion 1)
Powder foundation was applied to the hands and evaluated on a scale of 1 to 5 according to the criteria below.

・Judgment Criteria 5: Very evenly adhered 4: Evenly adhered 3: Relatively evenly adhered 2: Slightly uneven 1: Unevenly

(Adhesion 2)
After collecting the powder foundation by going back and forth 5 times with a puff, apply it once to a skin model (manufactured by Beaulux Co., Ltd.), and evaluate whether the powder foundation is evenly applied (adhered) using the following evaluation method. Evaluations were made on a five-point scale from 1 to 5 according to the criteria.

・Judgment Criteria 5: Very evenly adhered 4: Evenly adhered 3: Relatively evenly adhered 2: Slightly uneven 1: Unevenly

(Skin blurring effect)
0.775 mg/cm ² of powder foundation was applied onto a stain plate (manufactured by Beaulux Co., Ltd.), and whether the outline of the stain was hidden was evaluated on a five-point scale from 1 to 5 according to the evaluation criteria below.

・Judgment Criteria 5: The outline of the stain is well blurred 4: The outline of the stain is blurred 3: The outline of the stain is relatively blurred 2: The outline of the stain is not very blurred 1: The outline of the stain is blurred Not yet

Example 8 had higher values than Comparative Examples 6-7 and Reference Example 3 in smoothness, spreadability, adhesion 1-2, natural finish, and skin blurring effect. The reason for the improved feel, such as smoothness, spreadability, and adhesion, is that the calcium carbonate particles covering the flaky base powder roll on the skin, resulting in a smooth feel. This is thought to be because the flaky base powder inside the particles could be spread out, making it easier to apply the powder foundation uniformly over a wide range. The reason for the natural finish and improved skin blurring effect is that the calcium carbonate particles covering the sericite and mica moderately disperse the light reflected from the skin, resulting in an even skin tone. This is thought to be due to the spread, uniformity, and appropriate blurring effect.

Even in Example 9, in which the content of calcium carbonate particles was lower than in Example 8, it was superior to Comparative Examples 6 to 6 in all of smoothness, good spreadability, adhesion 1 to 2, natural finish, and skin blurring effect. Compared to Example 7 and Reference Example 3, the values were higher than those of Example 7 and Reference Example 3. Considering that Example 8 is more effective than Example 9, it is considered preferable to incorporate calcium carbonate particles in an amount of 60% by weight or more.

The powder material for cosmetics of the present invention is suitable for cosmetics, especially makeup cosmetics such as foundations, eye shadows, and blushers containing flaky base powder, basic cosmetics such as sunscreen cosmetics, emulsions, and creams. Suitable for use etc.

Claims (9)

A powder material for cosmetics comprising a flaky base powder whose surface is coated with inorganic particles,
In the powder material for cosmetics, the inorganic particles are calcium carbonate particles having a core of a divalent or trivalent metal salt. The powder material for cosmetics according to claim 1, wherein the divalent or trivalent metal salt is an aluminum salt. The powder material for cosmetics according to claim 1 or 2, wherein the amount of the divalent or trivalent metal salt is 0.010 to 0.10 parts by weight based on 100 parts by weight of the flaky base powder. The powder material for cosmetics according to claim 1 or 2, wherein the calcium carbonate particles have a particle size of 0.20 to 5 μm. The powder material for cosmetics according to claim 1 or 2, wherein the coating amount of the calcium carbonate particles is 10 to 50% by weight. The powder material for cosmetics according to claim 1 or 2, which satisfies the following conditions:
(Conditions) A silicone oil paste is prepared by dispersing the cosmetic powder material in a silicone oil containing 20% by weight, and the silicone oil paste is spread on a glass plate to a thickness of 0.025 mm using an applicator. When applied, the applied silicone oil paste has a total light transmittance of 80% or more and a haze value of 40% or more. A method for producing a powder material for cosmetics comprising coating the surface of a flaky base powder with inorganic particles, the method comprising:
a metal salt addition step of adding and mixing a divalent or trivalent metal salt to the suspension while stirring the suspension containing the flaky base powder and water;
By adding an aqueous calcium salt solution and an aqueous carbonate solution to the mixed solution obtained in the metal salt addition step while stirring the mixed solution, the divalent or trivalent metal salt is added to the surface of the flaky base powder. a precipitation step of precipitating calcium carbonate particles with a core of
A method for producing a powder material for cosmetics comprising: 8. In the metal salt addition step, the amount of the divalent or trivalent metal salt added is set to 0.010 to 0.10 parts by weight based on 100 parts by weight of the flaky base powder. A method for producing a powder material for cosmetics. A cosmetic containing the cosmetic powder material according to claim 1 or 2.