Solid powder cosmetic

Abstract

Provided is a solid powder cosmetic with excellent impact resistance. This solid powder cosmetic comprises a powder cosmetic containing (A) mica, (B) an acyl amino acid, (C) a metal soap, and (D) a glittering powder.

Description

Solid powder cosmetics REFERENCE TO RELATED APPLICATIONS

[0001] This patent application claims priority to an earlier filed Japanese patent application, Patent Application No. 2024-114314 (filing date: July 17, 2024), the entire disclosure of which is incorporated herein by reference.

[0002] The present invention relates to a solid powder cosmetic preparation.

[0003] Among makeup cosmetics, so-called multi-color molded products, in which powder cosmetics of two or more colors are molded into one container (inner tray), are commercially available as solid powder cosmetics such as face powder.

[0004] On the other hand, such solid powder cosmetics have a problem in that they tend to crack when subjected to impact because they contain a small amount of non-volatile oils and other components that act as binders.

[0005] In order to solve this problem, it has been proposed to prevent cracking and improve impact resistance and usability by devising the ingredients of powder cosmetics or improving the manufacturing method of solid powder cosmetics (Patent Documents 1 and 2).

[0006] Furthermore, in the case of solid powder cosmetics in which multiple powder cosmetics are packed into the same container by dry molding, such as multicolor molded products, efforts have been made to increase the oil content or to increase the pressing pressure, but these measures have not necessarily produced sufficient improvements, and in recent years, there has been a trend toward molded products with more complex shapes and superior design than before (Patent Document 3), so further improvements in impact resistance are desired.

[0007] Japanese Patent Application Laid-Open No. 2006-169207 Japanese Patent Application Laid-Open No. 2001-213722 Japanese Patent Application Laid-Open No. 2007-55941

[0008] The present invention provides a solid powder cosmetic.

[0009] The present inventors have surprisingly found that a solid powder cosmetic containing a specific powder cosmetic has good impact resistance. The present invention is based on this finding.

[0010] According to the present invention, the following inventions are provided: (1) A solid powder cosmetic comprising a powder cosmetic, the powder cosmetic comprising: (A) mica, (B) an acylamino acid, (C) a metal soap, and (D) a glittering powder. (2) The solid powder cosmetic according to (1), wherein the component (A) is one or more selected from the group consisting of natural mica, synthetic phlogopite, synthetic iron phlogopite, and sericite. (3) The solid powder cosmetic according to (1) or (2), wherein the component (B) is one or more selected from the group consisting of lauroyl lysine and caproyl lysine. (4) The solid powder cosmetic according to any one of (1) to (3), wherein the component (C) is one or more selected from the group consisting of magnesium myristate, calcium myristate, and zinc myristate. (5) The solid powder cosmetic according to any one of (1) to (4), wherein the powder cosmetic contains 15% by mass or more of the component (D) relative to the total amount of the powder cosmetic. (6) The solid powder cosmetic according to any one of (1) to (5), comprising a plurality of types of powder cosmetics, wherein some or all of the plurality of types of powder cosmetics exhibit different colors. (7) The solid powder cosmetic according to any one of (1) to (6), wherein the powder cosmetic is a powder cosmetic molded into a block shape. (8) The solid powder cosmetic according to (7), comprising a plurality of the powder cosmetic molded into a block shape. (9) The solid powder cosmetic according to (8), wherein at least one of the powder cosmetic molded into a block shape is arranged so as to be in contact with another block. (10) A method for producing the solid powder cosmetic according to any one of (1) to (9).

[0011] According to the present invention, a solid powder cosmetic having good impact resistance is provided. Specific Description of the Invention

[0012] According to one aspect of the present invention, there is provided a solid powder cosmetic comprising a powder cosmetic comprising (A) mica, (B) an acylamino acid, (C) a metal soap, and (D) a glittering powder.

[0013] The component (A) contained in the powder cosmetic of the present invention is mica. Such mica is not limited as long as it is a type commonly used as a raw material for cosmetics, etc., but examples thereof include natural mica, synthetic phlogopite, synthetic iron-phlogopite, sericite, etc., and is preferably one or more types selected from the group consisting of natural mica, synthetic phlogopite, synthetic iron-phlogopite, and sericite, and more preferably natural mica and synthetic phlogopite, or natural mica and synthetic iron-phlogopite.

[0014] The aspect ratio of component (A) in the powder cosmetic of the present invention is not particularly limited, but is preferably 25 or more, and more preferably 30-50.

[0015] In the present invention, the aspect ratio corresponds to the value obtained by dividing the major axis diameter of a particle (e.g., component (A), component (C), etc.) by the minor axis diameter (=major axis diameter / minor axis diameter), as shown in the following formula (1): The closer this aspect ratio is to 1.0, the closer the particle shape is to a square or a circle.

[0016] In the present invention, the "major axis diameter" refers to the length of the major axis of a particle, and more specifically corresponds to the width of the particle at the maximum distance between two parallel lines sandwiching the particle. In the present invention, the "minor axis diameter" refers to the length of the minor axis of a particle, and more specifically corresponds to the width of the particle measured on a straight line passing through the midpoint of the major axis and perpendicular to the major axis.

[0017] The blending amount of component (A) in the powder cosmetic of the present invention is not particularly limited, but the blending amount relative to the total amount of the powder cosmetic is preferably 20 to 80% by mass, and more preferably 35 to 60% by mass.

[0018] The component (B) contained in the powder cosmetic of the present invention is an acylamino acid. Such an acylamino acid may be a powdery condensate of a fatty acid and an amino acid. Such a fatty acid is preferably a straight-chain saturated fatty acid, and the number of carbon atoms of the fatty acid is preferably 8 to 14. Furthermore, such an amino acid is preferably an α-amino acid, more preferably lysine. Component (B) in the present invention is preferably one or more selected from the group consisting of lauroyl lysine and caproyl lysine.

[0019] The blending amount of component (B) in the powder cosmetic of the present invention is not particularly limited, but the blending amount relative to the total amount of the powder cosmetic is preferably 0.5 to 10% by mass, and more preferably 1 to 5% by mass.

[0020] The component (C) contained in the powder cosmetic of the present invention is a metal soap. Such metal soaps are not limited as long as they are commonly used as raw materials for cosmetics, etc. Examples include aluminum stearate, magnesium stearate, magnesium myristate, calcium myristate, zinc myristate, etc., which have residual hydroxyl groups, and are preferably one or more selected from the group consisting of magnesium myristate, calcium myristate, and zinc myristate, and more preferably magnesium myristate.

[0021] According to one preferred embodiment of the present invention, the powder cosmetic of the present invention comprises magnesium myristate as component (C).

[0022] The aspect ratio of magnesium myristate in the present invention is not particularly limited, but is preferably 1.0 to 2.0, more preferably 1.0 to 1.6, and even more preferably 1.0 to 1.5.

[0023] The average thickness of magnesium myristate in the present invention is not particularly limited, but is preferably 250 to 600 nm, more preferably 280 to 450 nm, and even more preferably 300 to 450 nm.

[0024] In the present invention, the average thickness is the average value obtained by measuring the side lengths of 10 particles (e.g., magnesium myristate) when the surface with the largest area is defined as the front. The average particle thickness is a value measured based on a two-dimensional projection image of the particle (e.g., SEM photograph, etc.).

[0025] The particle index of magnesium myristate in the present invention is not particularly limited, but is preferably 1.5 to 8.0, more preferably 1.5 to 6.0, and even more preferably 2.0 to 5.0.

[0026] In the present invention, the particle index corresponds to the value obtained by dividing the major axis diameter of a particle (e.g., magnesium myristate) by the minor axis diameter (=major axis diameter / minor axis diameter), and then dividing the result by the average thickness of the particle [=(major axis diameter / minor axis diameter) / average thickness of particle], as shown in the following formula (2):

[0027] The particle size summary value A of magnesium myristate in the present invention is not particularly limited, but is preferably 2.5 or less, more preferably 0.5 to 2.5.

[0028] In the present invention, the particle size summary value A is a value obtained by the following formula (3) and is calculated from particle diameters measured by a microtrack laser diffraction method. When a cumulative curve is calculated using the following formula (3) with the total volume of the powder mass taken as 100%, the particle diameters at the points where the cumulative curve is 10%, 50%, and 90% are defined as the 10% cumulative diameter (D10), 50% median diameter (D50; median diameter), and 90% cumulative diameter (D90) (μm), respectively. Note that the particle diameter means the particle diameter of the primary particle. If the particles are aggregated during measurement, they are dispersed using ultrasound or the like before measurement.

[0029] The microtrack laser diffraction method used in the present invention is a method for determining particle size distribution by utilizing scattered light obtained by irradiating particles with laser light, and is a wet measurement method in which a sample is introduced into a circulating organic solvent (e.g., ethanol, isopropyl alcohol, etc.) in which the particles to be measured (e.g., magnesium myristate, etc.) do not dissolve. The microtrack laser diffraction method in the present invention can be performed using, for example, a Microtrack MT-3000 manufactured by Nikkiso Co., Ltd.

[0030] The volume-based median diameter (D50) of magnesium myristate in the present invention is not particularly limited, but is preferably 10.0 to 40.0 μm, more preferably 13.0 to 35.0 μm, and even more preferably 15.0 to 25.0 μm. This median diameter (D50) is measured by a microtrack laser diffraction method, similar to the particle size summary value A.

[0031] The blending amount of component (C) in the powder cosmetic of the present invention is not particularly limited, but the blending amount relative to the total amount of the powder cosmetic is preferably 1 to 10% by mass, and more preferably 3 to 7% by mass.

[0032] The component (D) contained in the powder cosmetic of the present invention is a glittering powder. Such glittering powder is a plate-like or spherical powder that has an interference color, pearlescent or metallic luster and exhibits luster, and is not limited as long as it is one that is commonly used as a raw material for cosmetics, etc., but examples thereof include titanium oxide-coated synthetic phlogopite, tin oxide-coated synthetic phlogopite, iron oxide-coated mica titanium, carmine-coated mica titanium, carmine- and konjo-coated mica titanium, iron oxide- and carmine-treated mica titanium, konjo-treated mica titanium, iron oxide- and konjo-treated mica titanium, chromium oxide-treated mica titanium, black titanium oxide-treated mica titanium, acrylic resin-coated aluminum powder, silica, etc. Examples of the inorganic fine particles include coated aluminum powder, titanium oxide coated mica, titanium oxide coated bismuth oxychloride, colored titanium oxide coated mica, titanium oxide coated synthetic mica, titanium oxide coated silica, titanium oxide coated alumina, titanium oxide coated glass flakes, polyethylene terephthalate-polymethyl methacrylate laminated film powder, bismuth oxychloride, titanium oxide and iron oxide coated mica, titanium oxide and tin oxide coated alumina, titanium oxide and tin oxide coated mica, titanium oxide and tin oxide coated borosilicate, titanium oxide and tin oxide coated synthetic gold clouds, and fish scale foil.

[0033] Component (D) in the present invention differs from component (A) in that it is treated or coated with titanium oxide, etc. For example, the titanium oxide-coated synthetic phlogopite contained in the powder cosmetic of the present invention is component (D), while untreated or uncoated synthetic phlogopite contained in the powder cosmetic of the present invention is component (A).

[0034] The average particle size (median diameter) of component (D) contained in the powder cosmetic of the present invention is not particularly limited, but from the viewpoint of imparting high brilliance as a glittering powder, it is preferably 5 to 300 μm, and more preferably 10 to 100 μm.

[0035] The blending amount of component (D) in the powder cosmetic of the present invention is not particularly limited, but the blending amount relative to the total amount of the powder cosmetic is preferably 15% by mass or more, and more preferably 20 to 50% by mass.

[0036] The powder cosmetic of the present invention may or may not further contain microplastic beads (which in this specification means the same as "resin powder" in the cosmetics field. Note that microplastic beads may be abbreviated as MPB in this specification) as component (E1) in an amount of 20% by mass or less relative to the total amount of the powder cosmetic.

[0037] According to one preferred embodiment of the present invention, when the powder cosmetic of the present invention contains component (E1), the blending amount of component (E1) in the powder cosmetic is 20% by mass or less, more preferably 15% by mass or less, more preferably 10% by mass or less, more preferably 5% by mass or less, and more preferably 1% by mass or less.

[0038] According to another preferred embodiment of the present invention, the powder cosmetic of the present invention does not contain component (E1).

[0039] The powder cosmetic of the present invention may or may not further contain talc as component (E2) in an amount of 90% by mass or less based on the total amount of the powder cosmetic.

[0040] According to one preferred embodiment of the present invention, when the powder cosmetic of the present invention contains component (E2), the blending amount of component (E2) in the powder cosmetic is 90% by mass or less, more preferably 80% by mass or less, more preferably 70% by mass or less, more preferably 60% by mass or less, more preferably 50% by mass or less, more preferably 40% by mass or less, more preferably 30% by mass or less, more preferably 20% by mass or less, more preferably 15% by mass or less, more preferably 10% by mass or less, more preferably 5% by mass or less, and more preferably 1% by mass or less.

[0041] According to another preferred embodiment of the present invention, the powder cosmetic of the present invention does not contain component (E2).

[0042] The powder cosmetic of the present invention may contain other ingredients that are generally used as raw materials for cosmetics, etc., to the extent that the effects of the present invention are not impaired.

[0043] The powder cosmetic of the present invention may contain inorganic pigments such as titanium oxide, zinc oxide, red iron oxide, yellow iron oxide, and black iron oxide, colorants (coloring materials) such as pearlescent pigments and natural dyes, and elastomers such as silicone elastomers. These coloring materials may be different for some or all of the multiple powder cosmetics contained in the solid powder cosmetic of the present invention. In other words, the solid powder cosmetic of the present invention can be a multi-color solid powder cosmetic containing powder cosmetics that exhibit multiple colors (appearance colors, interference colors, etc.).

[0044] The powder cosmetic of the present invention may contain a solid oil. Such solid oil is not particularly limited as long as it is one that is commonly used as a raw material for cosmetics, etc., and examples thereof include hydrocarbons, waxes, and waxes such as solid paraffin, ceresin, microcrystalline wax, polyethylene wax, hardened oil, beeswax, Japan wax, candelilla wax, and other waxes; higher fatty acids such as stearic acid, lauric acid, myristic acid, and behenic acid; and higher alcohols such as cetyl alcohol, stearyl alcohol, and lauryl alcohol.

[0045] The powder cosmetic of the present invention may contain oil components other than the above-mentioned solid oil components. Examples of such oil components include esters, hydrocarbons, higher fatty acids, higher alcohols, and silicone oils.

[0046] Examples of such esters include fats and oils such as olive oil, castor oil, jojoba oil, and macadamia nut oil; fatty acid monoesters such as isopropyl myristate, isopropyl palmitate, cetyl 2-ethylhexanoate, and octyldodecyl myristate; glycerin esters such as glyceryl trioctanoate and glyceryl triisostearate; polyglycerin esters such as diglyceryl diisostearate and diglyceryl triisostearate; pentaerythritol esters such as pentaerythritol di-2-ethylhexanoate and pentaerythritol dioctanoate; trimethylolpropane esters such as trimethylolpropane trioctanoate and trimethylolpropane triisostearate; and malic acid esters such as diisostearyl malate.

[0047] Examples of such hydrocarbons include liquid paraffin, squalane, polybutene, liquid lanolin, and volatile hydrocarbons.

[0048] Examples of such higher fatty acids include isostearic acid and oleic acid.

[0049] Examples of such higher alcohols include isostearyl alcohol, oleyl alcohol, and octyldodecanol.

[0050] Examples of such silicone oils include dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, cyclic silicones (octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexanesiloxane, etc.), amino-modified polysiloxanes, alkyl-modified polysiloxanes, and fluorine-modified polysiloxanes.

[0051] The powder cosmetic of the present invention may further contain, for example, surfactants, moisturizers, polymers, dyes, lower alcohols, polyhydric alcohols, antioxidants, ultraviolet absorbers, cosmetic ingredients, antibacterial agents, preservatives, pH adjusters, fragrances, etc.

[0052] The powder cosmetic of the present invention may be contained in a solid powder cosmetic in a predetermined size and shape, for example, molded into a block and contained in the solid powder cosmetic. One or more such block-shaped powder cosmetic materials may be contained in the solid powder cosmetic.

[0053] When a solid powder cosmetic contains multiple powder cosmetics molded into blocks, some or all of the colors (appearance color, interference color, etc.) of the multiple powder cosmetics may be different from each other, and some or all of the powder cosmetics molded into blocks may be arranged so that they come into contact with other powder cosmetics molded into blocks. According to one preferred embodiment of the present invention, the solid powder cosmetic of the present invention is arranged so that at least one of the powder cosmetics molded into blocks comes into contact with another block.

[0054] The solid powder cosmetic of the present invention can be, for example, a makeup cosmetic such as foundation, concealer, face powder, control color, eye shadow, eye liner, cheek color, body powder, perfume powder, or baby powder.

[0055] The solid powder cosmetic of the present invention can be produced according to a method conventionally used for producing solid powder cosmetics, for example, by dry molding, wet molding, etc., but from the viewpoint of excellent impact resistance, it is preferably produced by wet molding. The solid powder cosmetic of the present invention may be decorated, for example, by embossing or debossing, as desired.

[0056] The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples. Contents are expressed in mass % unless otherwise specified.

[0057] Solid powder cosmetics of each Example and Comparative Example were prepared by a conventional method using the formulations shown in Tables 1 to 4. In Tables 1 to 4, the blending ratio of each component is expressed as % by mass.

[0058] The solid powder cosmetic compositions prepared above were evaluated for impact resistance, smoothness, and powder scattering according to the procedures described below.

[0059] Evaluation of Impact Resistance Five test samples of each of the prepared compositions of Examples and Comparative Examples were prepared and dropped onto a concrete floor from a height of 30 cm. The number of times (average) the test samples were dropped until defects in appearance such as cracks, fissures, fissures, or peeling occurred was counted, and the impact resistance was evaluated according to the following criteria. <Criteria> A: 15 or more times B: 10 to 14 times C: 6 to 9 times D: 5 or less times

[0060] Evaluation of Smoothness Ten expert panelists judged the smoothness of the prepared compositions of each Example and Comparative Example when applied to the skin according to the following criteria, with A or B being considered to be good smoothness. <Criteria> A: Very smooth feeling. B: Smooth feeling. C: Slightly smooth feeling. D: Almost no smooth feeling.

[0061] Evaluation of Powder Scattering When ten expert panelists used a brush to collect the prepared compositions of each Example and Comparative Example, they judged whether cosmetic powder scattered around according to the following criteria, with A or B being evaluated as no powder scattering. <Criteria> A: Almost no powder scattering. B: No powder scattering. C: Slight powder scattering. D: Powder scattering.

[0062] The results are shown in Tables 1 to 4.

[0063]

[0064]

[0065]

[0066]

[0067] The results in Tables 1 to 4 show that the solid powder cosmetics of Examples 1 to 6 all had good impact resistance, as well as good smoothness and dusting. On the other hand, the solid powder cosmetics of Comparative Examples 1 to 4 all had poor impact resistance, and were also poor in smoothness and dusting. These results demonstrate that the solid powder cosmetics of the present invention have the excellent effects of having good impact resistance, as well as good smoothness and dusting.

Claims

1. A solid powder cosmetic comprising a powder cosmetic, the powder cosmetic comprising: (A) mica; (B) acyl amino acid; (C) metal soap; and (D) glittering powder.

2. The solid powder cosmetic preparation according to claim 1, wherein component (A) is one or more selected from the group consisting of natural mica, synthetic phlogopite, synthetic iron phlogopite, and sericite.

3. A solid powder cosmetic preparation according to claim 1, wherein component (B) is one or more selected from the group consisting of lauroyl lysine and caproyl lysine.

4. A solid powder cosmetic preparation according to claim 1, wherein component (C) is one or more selected from the group consisting of magnesium myristate, calcium myristate, and zinc myristate.

5. The solid powder cosmetic according to claim 1, wherein the powder cosmetic contains component (D) in an amount of 15% by mass or more relative to the total amount of the powder cosmetic.

6. The solid powder cosmetic according to claim 1, comprising a plurality of types of powder cosmetics, some or all of which have different colors.

7. The solid powder cosmetic according to claim 1, wherein the powder cosmetic is molded into a block shape.

8. The solid powder cosmetic according to claim 7, comprising a plurality of said powder cosmetic products molded into blocks.

9. The solid powder cosmetic according to claim 8, wherein at least one of the powder cosmetic blocks is arranged so as to be in contact with another block.

10. A method for producing the solid powder cosmetic preparation according to any one of claims 1 to 9.

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