Cosmetics containing glitter pigments

Abstract

An objective of the present disclosure is to provide a novel cosmetic material including an improved pigment. The present disclosure provides a cosmetic material including a bright pigment, wherein the bright pigment includes a flake-shaped substrate and a coating film including zirconium oxide on the flake-shaped substrate, and the thickness of the coating film is 40-120 nm.

Description

[Technical Field]

[0001] The present invention relates to a cosmetic product containing a pigment, and in particular to a makeup cosmetic product containing a pigment. [Background technology]

[0002] Cosmetics contain pigments appropriate for their type. For example, base makeup cosmetics, such as foundation, contain extender pigments, color pigments, white pigments, pearlescent pigments, etc. Extender pigments are used to impart spreadability, adhesion, and even gloss, and are also used as extenders. Color pigments are used to impart basic color tones. White pigments are used to impart hiding power and whiteness.

[0003] Pearlescent pigments are used to impart a pearlescent luster (pearl effect). A typical pearlescent pigment is a flake substrate having an optical interference film on its surface. Examples of flake substrates include glass and mica. Titanium oxide films are typically used as optical interference films.

[0004] Pearlescent pigments are being developed to achieve stronger and more vivid colors. For example, Patent Document 1 proposes using metal fine particles together with an optical interference film to achieve strong color development. In Patent Document 1, red color development is enhanced by attaching gold fine particles onto a titanium oxide film. The enhanced color development is highly useful for imparting locally noticeable bright spots to cosmetics.

[0005] The amount of pearlescent pigment to be added varies depending on the intended use of the cosmetic product, but for base makeup cosmetics, it is at most about 8% by mass of the entire cosmetic product. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-299051 Summary of the Invention [Problem to be solved by the invention]

[0007] For example, the overall gloss of a base makeup cosmetic is adjusted by extender pigments. However, there is a limit to how much gloss can be improved by adjusting the extender pigments alone. On the other hand, conventional pearlescent pigments can locally improve gloss based on their high brightness, but they are not designed to be suitable for adjusting the overall properties of cosmetics.

[0008] Therefore, an object of the present invention is to provide a new cosmetic composition containing an improved pigment. [Means for solving the problem]

[0009] As a result of extensive research, the present inventors have found that the above-mentioned object can be achieved by using a pigment having a flake-shaped substrate and a coating containing zirconium oxide. In this specification, the improved pigment will be referred to as a luster pigment, since its primary purpose is not to produce pearlescent luster. Luster pigments are pigments that can improve brightness, regardless of whether they have pearlescent luster or not.

[0010] According to one aspect, the present invention provides: A cosmetic containing a glitter pigment, The bright pigment comprises a flake substrate and a coating containing zirconium oxide on the flake substrate, The cosmetic is provided, wherein the thickness of the coating is 40 nm or more and 120 nm or less.

[0011] According to another aspect of the present invention, A cosmetic containing a glitter pigment, The bright pigment comprises a flake substrate and a coating containing zirconium oxide on the flake substrate, further comprising an extender pigment different from the bright pigment, The present invention provides a cosmetic containing the luster pigment in an amount of 15 to 60% by mass based on the total amount of the luster pigment and the extender pigment. [Effects of the Invention]

[0012] According to the present invention, an improved luster pigment is used to provide a cosmetic that can provide a bright and natural appearance when applied to the skin. [Brief explanation of the drawings]

[0013] [Figure 1] 1 shows the results of observing a cross section of an example of a bright pigment using a scanning electron microscope (SEM). [Figure 2] 1 shows the results of SEM observation of the surface of an example of a bright pigment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described, but the following description is not intended to limit the present invention to any particular embodiment.

[0015] In this specification, "major component" means the component with the highest content. MMD is an abbreviation for mean deviation of mean friction coefficient (MIU). MMD is an index corresponding to the smoothness of the skin feel. The lower the MMD, the better the smoothness of the feel. Details of the method for measuring MMD will be explained in the Examples section.

[0016] (Photoluminescent pigment) The bright pigment of this embodiment comprises a flake substrate and a coating containing zirconium oxide on the flake substrate, the coating having a thickness of 40 nm to 120 nm.

[0017] Titanium oxide is known as a film-forming material that can achieve vivid color development due to its high refractive index. However, pigments with titanium oxide-containing coatings (titanium oxide-containing films) can sometimes produce an unnatural appearance when incorporated into cosmetics in significant amounts due to their excessive brightness and characteristic interference colors. Furthermore, the pronounced color development of titanium oxide-containing films can make their complementary colors more visible, resulting in the cosmetics appearing somewhat dull. Zirconium oxide-containing coatings (zirconium oxide-containing films) are inferior to titanium oxide-containing films in terms of color development and brightness, but are suitable for providing a bright appearance while mitigating the unnaturalness described above. Zirconium oxide-containing films are also suitable for imparting a "natural" color development, specifically a color development similar to human skin, to base makeup cosmetics such as foundations.

[0018] The bright pigment according to this embodiment has a reflected color of L * a * b * When displayed based on the color system, L is 30 or more and less than 70, preferably 35 or more and less than 68, and especially 40 or more and less than 65. * The reflective color of the titanium oxide film can be * is usually greater than 70. In this embodiment, the zirconium oxide-containing film can achieve a color development that is particularly desirable for base makeup cosmetics, specifically a color development ranging from silver to yellow and even orange. The method for measuring the reflected color will be explained in the Examples section.

[0019] It has been discovered that a bright pigment having a zirconium oxide-containing film can impart superior properties to cosmetics in terms of the feel it provides to the skin compared to a bright pigment having a titanium oxide-containing film. Skin feel is an important property in base makeup cosmetics. This preferable property provides a particularly advantageous effect when the bright pigment is blended into base makeup cosmetics in a substantial amount, for example, at a content of 10% by mass or more.

[0020] The bright pigment according to this embodiment may have an MMD of, for example, 1.5 or less, preferably 1.2 or less, more preferably 1.0 or less, even more preferably 0.8 or less, particularly preferably 0.6 or less, and in some cases 0.5 or less. The lower limit of the MMD is not particularly limited, but may be, for example, 0.01 or more. The bright pigment according to this embodiment may have an MIU of, for example, 2.1 or less, preferably 2.0 or less, more preferably 1.5 or less, and in some cases 1.0 or less. The lower limit of the MIU is not particularly limited, but may be, for example, 0.01 or more.

[0021] In this embodiment, the amount of the bright pigment blended can be, for example, 10% by mass or more, in some cases 12% by mass or more, and if necessary 14% by mass or more, based on the total amount of the cosmetic. However, the bright pigment of this embodiment may be blended into the cosmetic in an amount outside the above range, for example, 3% by mass or more, further 5% by mass or more, and particularly 7% by mass or more. There is no particular upper limit to the blended amount, but it is, for example, 30% by mass or less, further 35% by mass or less.

[0022] The flake substrate and coating that constitute the bright pigment will be described below. Flake-like substrate The flaky substrate is a minute, plate-like flake, also called a scale-like substrate. The flaky substrate is, for example, at least one selected from the group consisting of flaky glass, flaky alumina, flaky graphite, flaky iron oxide, flaky titania, bismuth oxychloride, mica, talc, and sericite. The flaky substrate is preferably flaky glass, flaky alumina, or mica. The mica may be natural or synthetic mica. Hereinafter, flaky glass, which is a particularly preferred flaky substrate, will be described.

[0023] The glass composition constituting the glass flakes may further contain, together with silicon oxide, a metal oxide other than silicon oxide; specifically, together with silicon oxide, at least one selected from the group consisting of aluminum oxide, calcium oxide, and sodium oxide. In the glass composition, silicon oxide may be the main component. The silicon oxide content in the glass composition is not particularly limited, but may be, for example, 40% by mass or more, 45% by mass or more, and 75% by mass or less. The glass composition may have a transmittance of more than 60%, or even more than 70%, over a wavelength range of 400 to 800 nm when converted to a thickness of 100 μm. Specifically, the glass composition may be at least one selected from the group consisting of soda-lime glass, A-glass, C-glass, E-glass, borosilicate glass, and aluminosilicate glass. Glass flakes composed of these multi-component glass compositions are suitable for production by a melting method, which is highly suitable for mass production.

[0024] The preferred average particle size of the glass flakes is 1 to 160 μm, 2 to 120 μm, further 3 to 100 μm, and in some cases 5 to 90 μm. The average particle size of the glass flakes is determined by the particle size (D50) corresponding to 50% of the cumulative volume from the smaller particle size side in the particle size distribution of light-scattering equivalent diameters measured by laser diffraction. The preferred thickness of the glass flakes is 0.1 to 10 μm, further 0.2 to 3 μm, and in some cases 0.25 to 2 μm. If the average particle size and thickness are too large, it becomes difficult to obtain a photoluminescent pigment with a sufficiently good tactile feel. However, with regard to thickness, an extremely good tactile feel can be obtained with glass flakes having a thickness of 1 to 2 μm. These numerical ranges also apply to the preferred average particle size and thickness of flake substrates other than glass flakes.

[0025] Glass flakes can be produced, for example, by the blowing method. The blowing method involves melting raw cullet, continuously removing the molten glass from a circular slit, blowing a gas such as air from a blow nozzle provided inside the circular slit to inflate the molten glass into a balloon-like shape, and then crushing the expanded, thinned glass into flakes (scales). As glass flakes, for example, commercially available products sold by Nippon Sheet Glass Co., Ltd. under the Glass Flake (registered trademark) series can be used.

[0026] The surface of glass flakes is smoother than that of crystalline particles such as mica, making them particularly suitable for achieving a sufficiently low MMD.

[0027] In one preferred embodiment, the bright pigment comprises glass flakes and a single-layer zirconium oxide-containing film formed directly on the surface thereof. However, a base film may be formed on the surface of the flake substrate. In this case, the coating containing zirconium oxide is formed on the surface of the base film. The base film may be a single layer or multiple layers. The base film may be a film containing an oxide.

[0028] Zirconium oxide-containing film The zirconium oxide-containing film contains at least zirconium oxide. The zirconium oxide-containing film may be mainly composed of zirconium oxide. The preferred film thickness of the zirconium oxide-containing film is 40 to 120 nm, more preferably 60 to 110 nm, and particularly preferably 80 to 100 nm. If the film thickness is too thin, the brightness decreases. The color produced by the zirconium oxide-containing film can be appropriately adjusted by controlling the film thickness, but as the film thickness increases, the color typically shifts from silver to yellow, orange, red, and purple. For base makeup cosmetics such as foundation, a color ranging from silver to yellow and orange is suitable. From this perspective, a film thickness of 120 nm or less is suitable. In a preferred embodiment, the surface of the zirconium oxide-containing film is exposed.

[0029] A liquid-phase film-forming method is suitable for forming a zirconium oxide-containing film on a flaky substrate. This liquid-phase film-forming method is usually carried out by dispersing the flaky substrate in a liquid containing a zirconium-containing salt and stirring the liquid. The liquid may be an aqueous solution in which a zirconium-containing salt is dissolved. Examples of the zirconium-containing salt include zirconium sulfate, zirconium oxychloride, and ammonium zirconium carbonate. If necessary, a pH adjuster such as an acid may be added to the liquid. The pH can be adjusted to, for example, 1.9 to 4.0, or preferably 2.0 to 3.5.

[0030] Prior to the formation of a zirconium oxide-containing film, the surface on which the film is to be deposited may be pretreated. This pretreatment is preferably contact with a liquid containing a tin-containing salt. This pretreatment facilitates obtaining a sufficiently low MMD from the zirconium oxide-containing film. The mechanism by which this pretreatment reduces the MMD is not yet clear, but it is possible that the surface and density of the resulting zirconium oxide are affected, resulting in a reduction in MMD. The liquid containing the tin-containing salt may be an aqueous solution in which the tin-containing salt is dissolved. Examples of tin-containing salts include tin chloride, more specifically tin(II) chloride, tin(IV) chloride, tin(II) chloride dihydrate, and tin(IV) chloride pentahydrate.

[0031] (Cosmetics) A cosmetic of the present embodiment contains the glitter pigment of the present embodiment. The cosmetic is not particularly limited and may be basic cosmetics such as lotion, emulsion, cream, etc.; hair care cosmetics such as hair styling agents; body care products such as body cream, body powder, antiperspirant, sunscreen, etc.; bath additives, etc., but is preferably makeup cosmetics such as foundation, mascara, eye shadow, eyeliner, lipstick, gloss, blush, nail polish, etc. The makeup cosmetics may be point makeup cosmetics such as lipstick, blush, etc., or base makeup cosmetics such as concealer, foundation, finishing powder, etc.

[0032] The form of the cosmetic is not particularly limited, and may be, for example, a powder, stick, pencil, cream, emulsion, dispersion, oil, tablet, capsule, liner, paint, gel, or the like. For example, a foundation may be any of cake type, powder type, cream type, and liquid type. The cosmetic may contain components that have been conventionally used as components other than the glitter pigment. The components other than the glitter pigment are selected appropriately depending on the type of cosmetic. The cosmetic may contain a pigment other than the glitter pigment.

[0033] For example, foundations contain extender pigments, color pigments, white pigments, pearlescent pigments, etc. The amount of pearlescent pigments in a foundation, which only need to provide localized luster, is at most about less than 8% by mass of the total amount of the foundation. In contrast, extender pigments are usually blended in amounts greater than the above in order to adjust the overall properties of the foundation.

[0034] The cosmetic may contain the luster pigment of this embodiment in a small amount, in other words, to the extent that the luster pigment functions as a pearlescent pigment, or in a substantial amount, in other words, to the extent that the luster pigment functions substantially as an extender pigment or a pigment similar thereto. In the latter case, the content of the luster pigment relative to the total amount of the cosmetic may be, for example, 10% by mass or more, particularly 12 to 18% by mass.

[0035] The cosmetic may further contain a different extender pigment in addition to the luster pigment of this embodiment. In this case, the luster pigment may be contained in an amount of 15 to 60% by mass, preferably 20 to 35%, of the total amount of the luster pigment and extender pigment. The extender pigment may be, for example, at least one selected from talc, sericite, mica, calcium carbonate, barium sulfate, magnesium silicate, cerium oxide, magnesium oxide, zeolite, and bentonite. The luster pigment of this embodiment can compensate for the lack of luster that is not achieved by these extender pigments alone, while avoiding unnecessary coloring. The luster pigment of this embodiment blended within the above range is suitable for achieving cosmetics that can provide a bright and natural appearance.

[0036] The following examples are provided to illustrate specific examples of the present invention, but are not intended to limit the scope of the present invention. The properties of the photoluminescent pigments obtained in the following examples and comparative examples were evaluated as follows.

[0037] (Tactile; MIU and MMD) The MIU, which corresponds to slipperiness, and the MMD, which corresponds to smoothness, were measured using a friction tester "KES-SE" manufactured by Kato Tech Co., Ltd. A 10 mm square silicone element was used as the friction element, and the measurement conditions were a static load of 50 g and a measurement speed of 1 mm / sec. The sample to be measured was a black artificial leather ("Protein Leather (registered trademark) Suplarle" manufactured by Ideatex Japan Co., Ltd.) on which a lustrous pigment was applied at a mass per unit area of ​​1.3 mg / cm. 2 The relative humidity at the time of measurement was 54%.

[0038] (reflected light; brightness and color) Reflected light brightness L * The measurements were made using a Konica Minolta colorimeter "CR-400." The sample to be measured was prepared by adding 10% by mass of a photoluminescent pigment to a transparent acrylic resin (Nippe Acrylic "Autoclear Super" manufactured by Nippon Paint Co., Ltd.) and mixing the resulting composition, which was then coated onto a white / black background hiding power measurement paper. The composition was applied to a coating thickness of 9 mil (approximately 228.6 μm), but the coating thickness after drying was 70-80 μm. The light source used was a D65 light source, and the measurement surface was the coated black background. The reflected light measured was perpendicular reflected light. The reflected light was observed using the CIE 2° visual color matching function.

[0039] (film thickness, substrate thickness) The thickness of the coating and the thickness of the substrate were measured by observing the cross section of the bright pigment using a scanning electron microscope (SEM).

[0040] (Average particle size D50) The average particle diameter of the flake substrate was measured by dispersing the flake substrate to be measured in water and measuring the diameter equivalent to 50% cumulative volume (D50) using Microtrac's "MT3300".

[0041] Example 1 Pretreatment of flake substrates In Example 1, flake glass with an average particle size (D50) of 80 μm and a thickness of 1.3 μm was used as the flake substrate. The flake glass used in this and subsequent examples was Glass Flake (registered trademark) manufactured by Nippon Sheet Glass Co., Ltd., and was composed of multi-component glass. This multi-component glass contained SiO2, Al2O3, MgO, and CaO, and further contained an alkaline component (at least one selected from Li2O, Na2O, and KO). First, 150 g of the flake substrate was mixed with 1.5 L of water and stirred. Next, hydrochloric acid was added to adjust the pH to 1.45-1.55. Subsequently, 9.06 mL of a 1.3 mass% tin (IV) chloride aqueous solution was added to the mixture. Stirring was continued, and the powder and liquid were separated by filtration. The separated powder was dispersed in water and filtered again to obtain a pretreated flake substrate.

[0042] Formation of zirconium oxide-containing films 150 g of the pretreated flake substrate was mixed with 1.5 L of water and heated to 75±3°C. Hydrochloric acid and sodium hydroxide were then added to adjust the pH to 2.0-3.5. Subsequently, a 20% by mass aqueous zirconium sulfate solution and a 10% by mass aqueous sodium hydroxide solution were simultaneously added dropwise over 3.5 hours while maintaining the pH at the above level, forming a zirconia oxide film. The powder and liquid were then separated by filtration. The separated powder was dispersed in an aqueous solution adjusted to a pH of 2.0-3.5 with hydrochloric acid, stirred, and then filtered twice, and then dispersed in water, stirred, and then filtered twice. Finally, the powder was dried in an atmosphere at 180°C for 12 hours and calcined at 600°C for 2 hours. Thus, a flaky substrate having a zirconium oxide-containing film formed on its surface was obtained.

[0043] Example 2 A flake substrate having a zirconium oxide-containing film formed on its surface was obtained in the same manner as in Example 1, except that flake glass having an average particle size (D50) of 18 μm and a thickness of 1.3 μm was used as the flake substrate.

[0044] Example 3 A flake substrate having a zirconium oxide-containing film formed on its surface was obtained in the same manner as in Example 1, except that flake glass having an average particle size (D50) of 8 μm and a thickness of 0.3 μm was used as the flake substrate.

[0045] Example 4 A flake substrate having a zirconium oxide-containing film formed on its surface was obtained in the same manner as in Example 1, except that flake glass having an average particle size (D50) of 120 μm and a thickness of 1.3 μm was used as the flake substrate.

[0046] Example 5 A flake substrate having a zirconium oxide-containing film formed on its surface was obtained in the same manner as in Example 1, except that flake glass having an average particle size (D50) of 160 μm and a thickness of 1.3 μm was used as the flake substrate.

[0047] Example 6 In the zirconium oxide-containing film forming step, a flake-shaped substrate having a zirconium oxide-containing film formed on its surface was obtained in the same manner as in Example 1, except that the dropping time was set to 4 hours and 30 minutes.

[0048] Example 7 A zirconium oxide-containing film was formed on the flake substrate as follows, without carrying out any pretreatment. The flake substrate used was the same as in Example 1. Formation of zirconium oxide-containing films Hydrochloric acid was added to 150 mL of water to adjust the pH to 2.0 to 3.5. 0.5 g of urea and 21 g of zirconium sulfate were added sequentially. 6 g of flaky substrate was then added and stirred for another 10 minutes. The powder and liquid were then separated by filtration. The resulting powder was then washed with water, dried at 90°C for 1.5 hours, and calcined at 800°C for 1 hour. Thus, a flaky substrate having a zirconium oxide-containing film formed on its surface was obtained.

[0049] (Comparative Example 1) A flake-shaped substrate having a zirconium oxide-containing film formed on its surface was obtained in the same manner as in Example 1, except that the dropping time in the zirconium oxide-containing film-forming step was set to 4 hours and 45 minutes.

[0050] (Comparative Example 2) A flake-shaped substrate having a zirconium oxide-containing film formed on its surface was obtained in the same manner as in Example 1, except that the dropping time was changed to 6 hours in the zirconium oxide-containing film forming step.

[0051] (Comparative Example 3) "Metashine (registered trademark) MT1080RS" manufactured by Nippon Sheet Glass Co., Ltd. was used.

[0052] Foundations were prepared using the lustrous pigments according to the formulations in Table 1. The foundations were applied to the skin, and the appearance was evaluated based on the following criteria. 4 points: Skin looks naturally bright and there is no glare. 3 points: Skin looks bright, but a little shiny. 2 points: The skin has a slightly unnatural color. 1 point: Unnatural glare is seen on the skin. The evaluation results are shown in Table 2 together with the properties of the bright pigment.

[0053] [Table 1]

[0054] [Table 2]

[0055] In addition, the L of the bright pigments in each example * In contrast, the L of the bright pigment of Comparative Example 3 was in the range of 40 or more and 65 or less. * was over 70.

[0056] Example 8 A flake substrate having a zirconium oxide-containing film formed on its surface was obtained in the same manner as in Sample 1, except that synthetic mica having an average particle size (D50) of 10 μm manufactured by Nihon Koken Kogyo Co., Ltd. was used as the flake substrate. The thickness of the synthetic mica was several μm or less.

[0057] Comparative Example 4 The material used was "Timiron Ice Crystal" manufactured by Merck, which has a titanium oxide-containing film formed on the surface of synthetic mica, a flake-shaped substrate.

[0058] The properties of the bright pigments are shown in Table 3.

[0059] [Table 3]

[0060] From Tables 2 and 3, it can be seen that the zirconium oxide-containing films formed in each Example are superior to the titanium oxide-containing films not only in appearance but also in the smoothness imparted by the luster pigment. The improvement in smoothness was particularly pronounced when glass flakes were used as the flake substrate and when the flake substrate was pretreated with tin. The reflected light and brightness of the zirconium oxide-containing film are suitable for cosmetic pigments, particularly for pigments used to adjust the overall properties of cosmetics.

[0061] The results of SEM observation of a flake substrate on which a zirconium oxide-containing film was formed are shown in Figures 1 and 2. The cross section shown in Figure 1 shows a zirconium oxide-containing film with a thickness of 90 nm. As shown in Figures 1 and 2, the zirconium oxide-containing film was densely composed of particles with a size of about several tens of nanometers.

Claims

1. A cosmetic containing a glitter pigment, The bright pigment comprises a flake substrate and a coating containing zirconium oxide formed directly on the surface of the flake substrate, the flake substrate is glass flake, The thickness of the glass flakes is 0.25 μm or more and 2 μm or less, The film thickness of the coating is 60 nm or more and 120 nm or less, A cosmetic that is a base makeup cosmetic.

2. A cosmetic containing a glitter pigment, The bright pigment comprises a flake substrate and a coating containing zirconium oxide formed directly on the surface of the flake substrate, the flake substrate is glass flake, The thickness of the glass flakes is 0.25 μm or more and 2 μm or less, The film thickness of the coating is 60 nm or more and 120 nm or less, A cosmetic containing the above-mentioned glitter pigment in an amount of 10 to 35% by mass.

3. A cosmetic containing a glitter pigment, The bright pigment comprises a flake substrate and a coating containing zirconium oxide formed directly on the surface of the flake substrate, the flake substrate is glass flake, The thickness of the glass flakes is 0.25 μm or more and 2 μm or less, The film thickness of the coating is 60 nm or more and 120 nm or less, further comprising an extender pigment different from the bright pigment, A cosmetic containing the luster pigment in an amount of 15 to 60% by mass based on the total amount of the luster pigment and the extender pigment.

4. The cosmetic according to any one of claims 1 to 3, wherein the mean mean deviation (MMD) of the mean coefficient of friction of the bright pigment is 1.5 or less.

5. The cosmetic according to claim 4, wherein the MMD is 0.6 or less.

6. The cosmetic according to any one of claims 1 to 3, wherein the average particle size (D50) of the flaky substrate is 180 µm or less.

7. The cosmetic according to claim 1, which is a foundation.

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