JP2000229809A - Cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cosmetic capable of hiding shape trouble of skin such as wrinkles, skin pores or roughness of texture and improving color tone trouble such as dermal stains or ephelides, excellent in persistence of effects and finishing the skin natural by including a silicon nitride having specific average particle diameter and a platy powder. SOLUTION: This cosmetic is obtained by including (A) a silicon nitride having 0.01-2 μm average particle diameter and (B) a platy powder (e.g. mucovite or biotite). The ingredients A and B preferably form a composite powder containing the ingredient A present on the surface of the ingredient B. The weight ratio of the ingredient A based on the sum total of the ingredients A and B is preferably 0.01-0.8. The average thickness of the ingredient B is <=1 μm. The average particle diameter thereof is preferably 10-60 μm. The formulation amount of the sum total of the ingredients A and B formulated in the cosmetic is 2-90 wt.%. A powder such as silicic acid, silicic acid anhydride, magnesium silicate or kaolin can be used in the cosmetic.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic, and more particularly to a cosmetic which can simultaneously hide morphological problems such as wrinkles, pores and rough skin texture and color problems such as spots and freckles. The present invention relates to a cosmetic that is excellent in persistence of effects and that can obtain a natural finish.

[0002]

2. Description of the Related Art Make-up cosmetics are intended to hide skin troubles such as wrinkles, pores and roughness of the skin, and color problems such as skin spots and freckles, and to make the skin look smooth and beautiful. In recent years, natural finishes that are not artificial have been desired. The natural finish of the cosmetic is rated as having no unnatural luster, excellent uniformity of application of the cosmetic film, and high transparency.

Conventionally, many new materials and new technologies have been proposed in order to obtain a natural finish while exhibiting the effects of the makeup cosmetics described above.

[0004] As a method of concealing morphological problems, cosmetics containing various diffuse reflection type powders are known. Japanese Unexamined Patent Publication No. 6-128122 discloses a wrinkle concealment combining a make-up base material for a first layer containing an adhesive substance and a make-up finish for a second layer containing a powder that diffuses and reflects light. Multi-layer cosmetics have been proposed. For this multi-layer cosmetic for concealing wrinkles, for example, a light diffusion reflection type composite powder in which talc particles are coated with an acrylic polymer is used.

[0005] However, in this cosmetic, when the cosmetic film is held on the skin for a long time, sebum mixes with the sticky substance, thereby deviating from the proper mixing range of the powder and the sticky substance, and the effect is reduced. There was a disadvantage that it would.

[0006] A domestic publication related to International Publication No. 92/03119 discloses a flaky fine powder in which a flaky material such as natural mica is coated with spherical fine particle silica. Since this flaky fine powder uses spherical fine particles having a large surface diffusion and scattering effect of light, when this flaky fine powder is used as a cosmetic compounding agent, it suppresses the gloss of the corners of the substrate mica and reduces wrinkles. So-called soft focus effects, such as making the skin less noticeable. Also, it is possible to obtain cosmetics with further improved slipperiness and feel during use. " (See the “Industrial Applicability” section in the above-mentioned national publication).

[0007] However, since the composite powder has a very good slipperiness, the cosmetic containing the composite powder is liable to be disturbed at the time of application, and it is difficult to apply the cosmetic uniformly, and natural There is a disadvantage that a good finish cannot be obtained. Further, the spherical particles used as the coating agent reduce the contact area of the composite powder with the skin, thereby reducing the adhesion to the skin, and causing the composite powder to lose its skin by physical impact such as rubbing by clothing. There is a drawback that the composition is easily peeled off from above, and the durability of the cosmetic effect is reduced. Also,
When the ratio of the spherical powder in the composite powder is reduced to improve the adhesion of the composite powder to the skin, there is a disadvantage that the effect on the morphological trouble cannot be sufficiently obtained.

On the other hand, in order to hide skin tone problems,
Conventionally, titanium dioxide having a high concealing property has been mainly used. The strength of the hiding power mainly depends on the refractive index of the substance. Titanium dioxide has a high refractive index, so cosmetics containing it are effective against color problems such as spots and freckles, but have a white finish, become thick and lose transparency, and have a natural finish. There was a disadvantage that it could not be obtained. Furthermore, the powder has a strong luster, and when a cosmetic containing the powder is applied on the skin, the difference in lightness between the skin ridge and the skin groove is greatly felt, and form troubles are caused. On the contrary, it has the drawback of making it more noticeable.

[0009] Japanese Patent Application Laid-Open No. 8-81332 discloses that
"Focusing on substances that have a filter effect of transmitting light of a specific wavelength, such as titanium mica, and using this filter effect to adjust the dark-colored portion of the skin" (Patent column 3, lines 24 to 27) is disclosed, and the composition for adjusting skin color uses "a filtering effect of a filter substance, so that it does not impair the transparency of the skin. It is possible to make the dark portions of the skin less noticeable in a natural form "(see column 18, lines 45 to 49 of the same publication). Japanese Patent Application Laid-Open No. Hei 10-17438 discloses a "visual effect of non-uniform skin made of iris foil" which is a "powder which produces various colors by baking titanium dioxide on the surface of mica and thereby causing interference colors". (Refer to column 1, lines 2 to 3 and column 2, lines 16 to 18 of the same publication), and this non-uniformity visual effect improving agent is referred to as a cause of dull skin. The non-uniformity of the skin, especially the non-uniformity of the distribution of the melamine pigment, can be made uniform by such coloration, so that it can be made inconspicuous by applying iris foil on the skin. The technical effect of "can be achieved" (Second column 18 of the publication)
Line to line 22).

[0010] However, these skin color adjusting composition and the agent for improving non-uniformity visual effect have a drawback that an unnatural gloss is given to the face due to the pearl luster which is also a characteristic of the powder.

On the other hand, the basic cosmetics are used for the purpose of maintaining the normal function of the skin and maintaining a healthy state, and the appearance after application has hardly been considered. Moisturizers, whitening agents, cell activators, etc., that penetrate into the skin and directly affect skin physiology are often added, and many studies on them have been conducted. Little has been considered about the improvement from an optical point of view, such as hiding trouble.

However, for example, by giving the effect of concealing this form trouble and color trouble in a hand cream used for keeping hands healthy, not only the effect from the inside but also the beautiful hand from the outside can be realized. It is possible to do. In addition, it is needless to say that the basic cosmetics are the same as the makeup cosmetics in that the effect is required to be effective and the cosmetic film is required to have a natural finish in order to effectively exhibit the effect.

Japanese Patent Application Laid-Open No. 4-364116 discloses "one of powders of metal carbide, metal nitride, and metal boride, and coated powder obtained by coating these powders with metal oxide. Cosmetics characterized by blending the above are disclosed (see column 1, line 2 to line 5 of the same publication). According to the description of this publication, a coated powder obtained by coating a metal nitride powder with a metal oxide is “a material that blocks near-infrared rays that damage elastic fibers of the dermis, while having a permeability to far-infrared rays. High, absorbed into the human epidermis and converted into thermal vibration, gently stimulates the dermis capillaries to promote blood circulation,
By activating metabolism, the effect of inhibiting skin aging is expected. ”(Column 4, line 4 to line 10 of the publication)
Line).

However, this publication does not disclose a skin morphological trouble improving effect or a color tone trouble improving effect. In the study of the present inventors, in cosmetics containing silicon nitride without using plate-like powder, morphological segregation, that is, aggregation, occurs. It is difficult to redisperse on the skin by the application operation of the cosmetic, that is, it is difficult to form a uniform decorative film on the skin at the time of applying the cosmetic, and it is therefore difficult to form a highly uniform silicon nitride layer. Therefore, it has been found that there is a disadvantage that the effect of hiding the form trouble and the color tone trouble is not exhibited. In addition, even when powders other than plate-like powders, such as spherical powders, are used as the powders responsible for the good dispersion state of silicon nitride in cosmetics, the morphological trouble and color tone trouble of the skin are improved. No effect was seen.

[0015]

SUMMARY OF THE INVENTION The present invention conceals skin morphological problems, such as wrinkles, pores, and rough skin, which cannot be achieved by the prior art, and at the same time, improves color tone problems, such as spots and freckles. It is an object of the present invention to provide a cosmetic which can be used, has excellent effect persistence, and has a natural finish. Here, "natural finish" means
For example, it can be rephrased that there is no unnatural luster, the uniformity of application of the cosmetic is excellent, and there is a sense of transparency.

[0016]

Under such circumstances, the present inventors have conducted intensive studies to obtain a cosmetic having the above-mentioned disadvantages and excellent cosmetic performance. It is difficult to disperse uniformly in the preparation and on the skin, but it is excellent in adhesiveness, and it is combined with silicon nitride and plate-like powder that express light diffusion remarkably to be incorporated into cosmetics. As a result, it has been found that a cosmetic having excellent continuity of the effect and a natural finish can be obtained, and a cosmetic having a natural finish can be obtained.

That is, according to the present invention, the average particle size is 0.0
An object of the present invention is to provide a cosmetic comprising silicon nitride having a thickness of 1 μm to 2 μm and a plate-like powder. It is also preferable that the silicon nitride and the plate-like powder form a composite powder in which silicon nitride is present on the surface of the plate-like powder.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, silicon nitride and a silicon nitride are used in order to provide an excellent effect of improving morphological troubles and an effect of improving color tone troubles, and also to obtain excellent natural effects. And the powdery powder are blended into the cosmetic.

The silicon nitride includes disilicon trinitride (Si ₂ N ₃ ),
There are monosilicon mononitride (SiN), trisilicon tetranitride (Si ₃ N ₄ ) and the like, all of which can be used for the cosmetic of the present invention.
Silicon nitride in the present invention can be prepared by various preparation methods, for example,
It can be obtained by a preparation method in which silicon is heated in nitrogen or the like, and it is preferable to select an optimum preparation method from known preparation methods in the technical field of silicon nitride in view of production costs and the like.

The shape of the silicon nitride is preferably not spherical in order to obtain good adhesion of the cosmetic of the present invention to the skin. Examples of the shape include an irregular shape, a cubic shape, and a rectangular parallelepiped shape. . However, the shape of the silicon nitride is preferably a cubic shape or an irregular shape, and particularly preferably a cubic shape. In the present invention, the shape of the silicon nitride can be rephrased as a shape recognizable by an appropriate observation means such as an electron microscope, for example, and necessarily has a shape such as a cubic shape in a strict sense. Does not mean.

The average particle size of silicon nitride in a preferred embodiment is 0.01 μm to 2 μm, preferably 0.1 to 1.5 μm.
μm. In addition, the average particle diameter described in the present invention is obtained by observing the powder using an electron microscope,
An average value obtained by measuring 0 particle diameters is shown. In addition, the particle size here indicates an average value of the major axis length and the minor axis length of the primary particles.

Although the particle sizes need not be uniform, it is preferable that the silicon nitride be monodispersed particles in order to more effectively exert the function according to the present invention. The term “monodisperse” means that the particle size distribution is narrow, and the coefficient of variation of the particle diameter is preferably 20% or less, particularly preferably 10% or less. The average particle size is 0.
When the thickness is less than 01 μm, the feeling of use may be deteriorated, for example, a squeaky feeling or slipperiness may be deteriorated. On the other hand, if the thickness exceeds 2 μm, the light scattering effect is reduced, so that the trouble improvement effect may be reduced.

Next, examples of the plate-like powder include flaky or scaly powders, and in general, natural mica groups such as muscovite, biotite, and sericite, and synthetic mica. Mica, talc, platy titania, and flaky materials such as glass flakes can be mentioned. The average thickness of the plate-like powder is
Usually, it is 1 μm or less. Furthermore, the average particle size is
Usually, it is 1 to 100 μm, preferably 5 to 80 μm, and more preferably 10 to 60 μm. The plate-like powder having an average thickness and an average particle diameter within the above ranges has a good dispersion state in the cosmetic, and can exert the effects of the present invention well. Here, the average thickness and the average particle diameter of the plate-like powder can be determined by measurement using an electron microscope. Suitable plate-like powders in the present invention include, for example, talc JA-46R, talc JA-
68R (manufactured by Asada Flour Milling Co., Ltd.), Mica M-102 (manufactured by Miyoshi Kasei Co., Ltd.), Mica Y-3000, Mica Y-23
00 (manufactured by Yamaguchi Mica Corporation), synthetic mica PDM-9W
A, Synthetic mica PDM-1000 (Topy Industries, Ltd.)
), Sericite SL (manufactured by Miyoshi Kasei Co., Ltd.) and Sericite GMS-C (manufactured by Kinseimatic Co., Ltd.).

The weight ratio of the plate-like powder to the silicon nitride is determined so that the technical effects of the present invention can be achieved well. And the weight ratio of silicon nitride to the sum of
0.8 is preferable in terms of feeling of use and manifestation of effects. If the weight ratio of silicon nitride is less than 0.01, the effect of improving the morphological problems due to the optical properties of silicon nitride is poor, and the gloss of the plate-like powder cannot be lost. If it exceeds 0.8, the slipperiness is impaired. In some cases, the uniformity of the cosmetic on the skin may be poor.

The cosmetic according to the present invention may contain silicon nitride and a plate-like powder in a mixed state. However, in order to further exert the technical effects of the present invention, It is preferable to contain these as a composite powder in which silicon nitride exists on the surface of the plate-like powder.

The manner in which silicon nitride is present on the surface of the plate-like powder in the composite powder includes both support and immobilization. In the composite powder, the fact that silicon nitride is supported on the surface of the plate-like powder and is fixed is, for example, when the composite powder is immersed in water and observed with an optical microscope. In addition, among the composite powders, in the case where silicon nitride is supported on the surface of the plate-like powder, it is observed that the silicon nitride separates from the surface of the plate-like powder and disperses separately. It can be confirmed by observing that silicon nitride is still fixed to the surface of the plate-like powder when it is fixed on the surface of the plate-like powder.

As a method of supporting silicon nitride on the surface of the plate-like powder, specifically, a powder / powder mixing method in a dry system, or a method of once dispersing the mixed powder in a volatile dispersion medium, ,
There is a wet method in which the dispersion medium is removed and silicon nitride is deposited on the plate-like powder by electrostatic interaction. Further, as the wet method, a solvent evaporation method, a freeze drying method, a spray drying method and the like can be adopted.

As a method for immobilizing silicon nitride on the surface of the plate-like powder, a strong friction is applied to the silicon nitride in the air or water to generate SiO ₂ on the surface of the silicon nitride (Si ₃ N ₄ + 3O ₂ → 3SiO ₂ + 2N ₂ ; Si ₃ N
₄ + 6H ₂ O → 3SiO ₂ + 4NH ₃ ), and further, by hydrating the surface, a silanol group is generated, and the functional group and the hydroxyl group on the surface of the plate-like powder are dehydrated and condensed. Therefore, the above method is preferable. Also,
If it is desired to make the immobilization stronger according to the purpose, it is preferable to chemically bond the plate-like powder and silicon nitride with a coupling agent such as alkoxysilane.

The composite powder thus obtained is subjected to a surface treatment of the composite powder as it is or, if necessary, with a known treating agent. It can be blended by the same method as blending the inorganic pigment.

In order to further enhance the effects of the present invention, it is preferable that the total compounding amount of silicon nitride and plate-like powder mixed in the cosmetic is 2% by weight or more. If the amount is less than 2% by weight, the effect exerted may not be sufficient. The upper limit of the amount is preferably 90% by weight.

As long as the object of the present invention is not impaired, powders used in ordinary cosmetics can be used for the cosmetics of the present invention, in addition to the above-mentioned powders. Examples of the powder include silicic acid, silicic anhydride, magnesium silicate, kaolin, clay, bentonite, red iron oxide, titanium-coated mica, bismuth oxychloride, zirconium oxide, magnesium oxide, zinc oxide, titanium oxide, aluminum oxide, calcium sulfate, and sulfuric acid. Inorganic powders such as barium, magnesium sulfate, calcium carbonate, magnesium carbonate, iron oxide, ultramarine blue, chromium oxide, chromium hydroxide, calamine, carbon black and composites thereof, polyamide, polyester, polypropylene, polystyrene, polyurethane, vinyl resin , Urea resin, phenol resin, fluorine resin, silicon resin, acrylic resin, melamine resin, epoxy resin,
Organic powders such as polycarbonate resin, divinylbenzene / styrene copolymer, silk powder, cellulose and their composites, and these with surfactants, silicone, metal soaps, lecithin, amino acids, collagen, polymers, fluorine compounds, etc. Surface-treated ones and the like can be mentioned.

The cosmetics of the present invention include, in addition to the above components, components used in ordinary cosmetics, for example, petrolatum, lanolin, ceresin, microcrystalline wax, carnauba wax, candelilla wax, higher fatty acids, higher alcohols Solid and semi-solid oils, squalane, liquid paraffin, ester oils, liquid oils such as diglycerides, triglycerides, silicone oils, etc., fluorine oils such as perfluoropolyether, perfluorodecalin, perfluorooctane, water-soluble and oil-soluble Polymer, water,
Inorganic and organic pigments, metallic soap-treated or silicone-treated inorganic and organic pigments, coloring agents such as organic dyes, surfactants, ethanol, preservatives, antioxidants, pigments, thickeners,
A pH adjuster, a fragrance, an ultraviolet absorber, a humectant, a blood circulation promoter, a cooling agent, an antiperspirant, a bactericide, a skin activator, and the like can be appropriately compounded within a range that does not impair the effects of the present invention.

The cosmetics of the present invention include makeup cosmetics such as liquid foundations, oily foundations, powder foundations, face powders, lipsticks, blushers, eye shadows, etc., as well as other medicated cosmetics such as sunscreen emulsions and body powders. , Hand cream and the like.

[0034]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto.

<Production Example 1 (Composite Powder 1: Composite Powder Having Silicon Nitride Supported on Plate-like Powder Surface)> Average Particle Diameter is 0.4
μm, and the coefficient of variation is 9.1%.
₃ N ₄ 7.5 g, talc (talc EN-68R (manufactured by Asada Milling (Ltd.))) 10 g, and muscovite (mica Y-2300
(Manufactured by Mika Yamaguchi Corporation) 20 g of ethanol 600
g, and the dispersion medium, ethanol, was distilled off under reduced pressure at 60 ° C. while stirring the dispersion. After the dispersion medium is distilled off,
The obtained solid was dried at 110 ° C. to obtain 37.5 g of composite powder 1. Using the obtained composite powder 1, cosmetics described later were prepared with the composition shown in Table 1.

<Production Example 2 (Composite powder 2: Composite powder in which silicon nitride is directly bonded to the surface of a plate-like powder)> The average particle diameter is 0.6 μm, and the coefficient of variation is 8.3%. 7.5 g of cubic silicon nitride (Si ₃ N ₄ )
The dispersion was centrifuged at 3000 rpm for 20 minutes, the supernatant was removed by tilting the container, and the remaining water-absorbed solid was triturated with a Hoover-type muller. Further, the milled solid was dispersed again in 100 g of ion-exchanged water, and the above-mentioned centrifugation and milling were performed under the same conditions as above. Repeat this series of operations for two more
Each time, a silanol group was generated on the surface of the silicon nitride particles. Further, 10 g of the milled powder, 10 g of talc (Talc JA-46R (manufactured by Asada Flour Milling Co., Ltd.)) and 20 g of muscovite (Mica Y-3000 (manufactured by Yamaguchi Mica Industries Co., Ltd.)) were mixed in 600 g of ethanol. And, while stirring the dispersion, adding ethanol as a dispersion medium to 60
Distilled off under reduced pressure at ℃. After the dispersion medium is distilled off, the obtained solid is
Dried at 10 ° C, and further baked at 600 ° C for 4 hours.
6.0 g of composite powder 2 was obtained. Using the obtained composite powder 2, a cosmetic described later was prepared with the composition shown in Table 1.

<Production Example 3 (Composite Powder 3: Composite Powder in which Silicon Nitride is Adhered to and Immobilized on a Plate-like Powder Surface)> The average particle diameter is 0.4 μm and the coefficient of variation is 9.1. % Of cubic Si ₃ N _4, 7.5 g of talc (talc JA-68R
(Manufactured by Asada Flour Milling Co., Ltd.) 10 g and muscovite (mica M
-102 (manufactured by Miyoshi Kasei Co., Ltd.)) in ethanol 5
43.0 g, and ion-exchanged water 57.0 was added thereto.
g was added. Next, the dispersion was heated to 50 ° C.
3.4 g of tetraethoxysilane and 3.0 of 0.85N hydrochloric acid
ml was simultaneously added dropwise over 5 minutes. After dropping,
Further, this dispersion was heated and stirred at 50 ° C. for 2 hours.
Further, while stirring the dispersion, ethanol as a dispersion medium was distilled off at 85 ° C. After the dispersion medium was distilled off, the obtained solid was heated to 150 ° C. at a rate of 5 ° C./min while gently stirring. Finally, the solid is heated to 600 ° C.
For 4 hours to obtain 38.0 g of composite powder 3. Using the obtained composite powder 3, cosmetics described below were prepared with the composition shown in Table 1.

<Production Example 4 (Composite Powder 4: Composite Powder in which Silicon Nitride is Adhered to and Immobilized on a Plate-like Powder Surface)> As the plate-like powder, 10 g of talc used in Production Example 3 and 38. The same procedure as in Production Example 3 except that 30 g of muscovite used in Production Example 3 was used instead of 20 g of muscovite.
3 g of composite powder 4 was obtained. Using the obtained composite powder 4,
The cosmetics described below were prepared with the composition shown in Table 2.

<Comparative Production Example 1 (Composite Powder 5: Composite Powder Having Spherical Silica Supported on Plate-like Powder Surface)> Instead of silicon nitride, spherical silica having an average particle diameter of 0.6 μm was supported. Except for the above, 37.0 g of composite powder 5 was obtained by the same treatment as in Production Example 1. Using the obtained composite powder 5, a cosmetic described later was prepared with the composition shown in Table 1.

<Comparative Production Example 2 (Composite powder 6: Composite powder in which spherical silica is adhered to and fixed on the surface of a plate-like powder)> Instead of silicon nitride, spherical silica having an average particle diameter of 0.3 μm Were bonded and fixed to obtain 37.6 g of composite powder 6 by the same processing operation as in Production Example 3. Using the obtained composite powder 6, a cosmetic described below was prepared with the composition shown in Table 1.

<Comparative Production Example 3 (Composite powder 7: Composite powder in which spherical silica is adhered to the surface of a plate-like powder and immobilized)> In place of silicon nitride, spherical silica having an average particle diameter of 0.6 μm was used. And 10 g of talc and muscovite 2 used in Production Example 3
Instead of 0 g, 37.0 was carried out by the same processing operation as in Production Example 3 except that 30 g of muscovite used in Production Example 3 was used.
g of composite powder 7 was obtained. Using the obtained composite powder 7, a cosmetic described below was prepared with the composition shown in Table 2.

<Powder Foundation> (Examples 1 to 4) At the same time as mixing the powder components (A) shown in Table 1 in a Henschel mixer, an oil component (B) separately heated and mixed was added. Further, they were sufficiently mixed and press-molded to obtain a powder foundation.
All numerical values shown in Table 1 indicate parts by weight.

[0043]

[Table 1]

(Comparative Example 1) Instead of the silicon nitride of Example 1,
Except for using spherical silica having an average particle diameter of 0.6 μm, cosmetics were prepared in the same manner as in Example 1 with the composition shown in Table 1.

(Comparative Example 2) Cosmetic material was prepared in the same manner as in Example 1 except that the composite powder 1 of Example 2 was replaced with the composite powder 5 of Comparative Production Example 1. Was prepared.

(Comparative Example 3) Cosmetic material was prepared in the same manner as in Example 1 except that the composite powder 3 of Example 4 was replaced with the composite powder 6 of Comparative Production Example 2. Was prepared.

<Hand cream> (Example 5) The B component was uniformly mixed with the purified water shown in Table 2, and
Heat to ° C. A component is also heated and stirred and dissolved to 70 ° C.
The component A was added to the component B, uniformly emulsified with a homomixer, and then cooled to room temperature to obtain a hand cream. All numerical values in Table 2 indicate parts by weight.

Comparative Example 4 A cosmetic was prepared in the same manner as in Example 5, except that the composite powder 4 produced in Comparative Production Example 3 was used instead of the composite powder 4 obtained in Example 5.

Comparative Example 5 The procedure of Example 5 was repeated, except that 10.0 parts by weight of the composite powder 4 in Example 5 was replaced by 2.0 parts by weight of titanium dioxide having an average particle diameter of 0.25 μm. A cosmetic was prepared.

Comparative Example 6 The procedure of Example 5 was repeated except that 2.0 parts by weight of silicon nitride having an average particle diameter of 0.4 μm was used instead of 10.0 parts by weight of the composite powder 4 in Example 5. A cosmetic was prepared.

[0051]

[Table 2]

<Evaluation Method> Examples 1 to 5 and Comparative Example 1
With respect to the powder foundation and hand cream obtained in Nos. 6 to 6, the effects at the time of application and the finished feeling were evaluated by 10 expert panelists. The evaluation was performed according to the following five-level evaluation, and the average value was symbolized and shown. Table 3 shows the results of the sensory evaluation of the powder foundation, and Table 4 shows the results of the sensory evaluation of the hand cream. Among the effects of the application and the finished feeling, the magnitude of the unnatural gloss is such that when applied to the skin, the degree to which the unnatural gloss due to specular reflection of a powder or the like is visually recognized is smaller. Was evaluated as good. In the following evaluation of the magnitude of the unnatural gloss, "5: very good" indicates that the unnatural gloss was hardly recognized. Evaluation 1: Very bad 2: Slightly bad 3: Normal 4: Slightly good 5: Very good Average value 1 or more and less than 2: × 2 or more and less than 3: △ 3 or more and less than 4: ○ 4 or more and 5 or less: ◎

[0053]

[Table 3] Powder foundation

[Table 4] Hand cream

[0054]

According to the cosmetic obtained by the present invention, silicon nitride having a suitable light diffusing property and concealing property is blended in the cosmetic together with a plate-like powder exhibiting the effect, so that it can be applied to the skin. When applied, it effectively hides morphological troubles by making the difference in brightness of skin irregularities inconspicuous, and can also exert an effect on color tone troubles at the same time with appropriate concealment properties, and furthermore, the effect lasting An excellent and natural finish can be obtained.

In particular, in the case of a cosmetic containing a composite powder in which silicon nitride is present on the surface of a plate-like powder, the dispersibility and uniformity of silicon nitride in the cosmetic and on the skin are further improved. This has the technical effect that it can be improved and a natural finish can be achieved.

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Claims (3)

[Claims] 1. A cosmetic comprising silicon nitride having an average particle size of 0.01 μm to 2 μm and a plate-like powder. 2. The method according to claim 1, wherein the silicon nitride according to claim 1 and the plate-like powder according to claim 1 form a composite powder in which silicon nitride exists on the surface of the plate-like powder. 2. The cosmetic according to 1. 3. The method according to claim 1, wherein the weight ratio of silicon nitride to the total of the silicon nitride according to claim 1 and the plate-like powder according to claim 1 is in a range of 0.01 to 0.8. The cosmetic described.