JP7523911B2 - Solid powder cosmetics - Google Patents

Description

The present invention relates to a solid powder cosmetic.

Conventionally, it has been known to blend water-insoluble spherical plastic polymers such as nylon powder (see Patent Document 1, JP 2015-193564 A) and acrylic powder (see Patent Document 2, JP 2014-172864 A) known as microplastic beads into cosmetics in order to improve not only the pore blurring effect and bare skin feel and transparency, but also the feel and smoothness when applied.

On the other hand, microplastic beads have become a major social problem in the marine environment, and there is concern that marine organisms may ingest the microplastic beads themselves and the harmful substances (such as PCBs and DDT) attached to them, and that bioaccumulation may affect the health of seabirds and humans. For this reason, the incorporation of microplastic beads into cosmetics is being regulated. In the United States, the incorporation of microplastic beads into wash-off cosmetics such as scrub-containing cleansers and toothpastes has already been restricted since July 2017, and in Japan, the Japan Cosmetic Industry Association requested voluntary restrictions in March 2016, and since January 21, 2019, it has been regulated as the Japan Cosmetic Industry Association's voluntary standard (Non-Patent Document 1: Cosmetic Industry Association Notice 2019002, January 21, 2019), and this movement is spreading worldwide.
Various countries are considering applying such regulations not only to rinse-off cosmetics but also to all cosmetics. China has a policy to completely ban production from January 1, 2021, and to completely ban sales from January 1, 2023 (Non-Patent Document 2: China's "Industrial Structure Adjustment Guidance Catalog (2019 Edition)" published by the China Development and Reform Commission on October 30, 2019), and the European Chemicals Agency is also moving to ban the use of microplastic beads in all cosmetics (Non-Patent Document 3: HBW Insight, February 8, 2019).
Therefore, the development of cosmetics free of microplastic beads has become an urgent global issue.

Conventionally, sunscreen cosmetics containing various UV protection agents have been developed to protect the skin from the adverse effects of UV rays. SPF (Sun Protection Factor) is known as an index that indicates the degree of UV control effect of such sunscreen cosmetics. Conventionally, in Europe, the United States, Japan, etc., there has been a standard that the maximum SPF value that can sufficiently protect against the adverse effects of UV rays is "50+". However, in the market, there has been a need for sunscreen cosmetics with higher UV protection effect, as the effect of "50+" is insufficient. In this situation, the US Food and Drug Administration (FDA) announced a proposed regulation on sunscreen products in February 2019, proposing to raise the maximum SPF value to "60+" based on evidence showing more significant clinical benefits, and there has been a movement by regulatory authorities to review the UV protection effect, and there is an urgent need to develop sunscreen cosmetics with a high SPF value that exceeds the maximum value of "50+", which is the conventional standard. (Non-Patent Document 4: U.S. Food and Drug Administration (FDA) Proposal for Sunscreen Regulations <URL: https://www.federalregister.gov/documents/2019/02/26/2019-03019/sunscreen-drug-products-for-over-the-counter-human-use>

Powder cosmetics with UV protection effects contain metal oxides such as titanium oxide, zinc oxide, and cerium oxide, and UV absorbers with UVA and UVB blocking effects as their main ingredients. However, when a large amount of UV absorbers is added to enhance the UV protection effect, the powders tend to cohere with each other, which can impair basic qualities such as the uniformity of the cosmetic film and the smooth feel of the film. On the other hand, with regard to metal oxides, development has been made of metal oxides with powder diameters and shapes suitable for enhancing the UV protection effect (see Patent Document 3, JP 2010-168254 A), and surface treatment technologies have been developed to improve the dispersibility and feel of these powders (see Patent Document 4, JP 2013-079264 A).

However, when these spherical polymers are blended in large quantities into solid powder cosmetics, moldability is poor, and the product may break when dropped or float over time. In addition, blending a large amount of finely powdered metal oxides can result in a poor feel when in use.

JP 2015-193564 A JP 2014-172864 A JP 2010-168254 A JP 2013-079264 A

Cosmetic Industry Federation Notification 2019002, January 21, 2019 China's "Industrial Structure Adjustment Guidance Catalog (2019 Edition)" published by the China Development and Reform Commission on October 30, 2019 HBW Insight, February 8, 2019 U.S. Food and Drug Administration (FDA) press release, Internet, URL: https://www.fda.gov/news-events/press-announcements/fda-advances-new-proposed-regulation-make-sure-sunscreens-are-safe-and-effective, February 21, 2019

The present invention has been made in consideration of the problems described above, and has as its object to provide a solid powder cosmetic which is free of plastic microbeads, yet has good moldability, good usability, and high UV protection effect. The inventors have intensively investigated these problems and have completed the present invention. That is, the present invention is as follows.

(1)
A solid powder cosmetic comprising (A) and (B).
(A) Inorganic plate-like powder coated with metal oxide (B) Spherical silica with oil absorption of 50 to 350 mL/100 g (2)
2. The solid powder cosmetic according to claim 1, which does not contain plastic microbeads.
(3)
(A) The solid powder cosmetic according to (1) or (2), wherein the content of the fine particle metal oxide contained in the metal oxide-coated inorganic plate-like powder is 10 to 20 mass% based on the total amount of the solid powder cosmetic.
(4)
The solid powder cosmetic preparation according to any one of (1) to (3), having an SPF of 60 or more as measured in accordance with ISO Standard 24444:2010.
(5)
Item 1. The solid powder cosmetic preparation according to any one of items 1) to 4, further comprising zinc oxide-coated spherical powder.

The solid powder cosmetic of the present invention is free of plastic microbeads, yet has good moldability, good usability, and high UV protection effects.

The following describes in detail the embodiments of the present invention. However, the present invention is not limited to the following embodiments.

The solid powder cosmetic of the present invention contains inorganic plate-like powder coated with a metal oxide (hereinafter, sometimes referred to as composite plate-like powder). The metal oxide in the composite plate-like powder of the present invention is not particularly limited as long as it is acceptable for use in cosmetics, but it is preferable that it is one or two types selected from titanium dioxide and zinc oxide because of its high sunscreen effect. The shape of the metal oxide is not particularly limited. From the viewpoint of ultraviolet protection ability, the average particle size of the metal oxide is preferably 10 to 200 nm, more preferably 15 to 100 nm, and even more preferably 15 to 50 nm.

In the present invention, the average particle size is the average particle size based on volume, and can be measured using a laser diffraction/scattering particle size distribution measuring device.

Specific examples of the inorganic plate-like powder in the composite plate-like powder of the present invention include sericite, talc, mica, kaolin, etc., with sericite, talc, and mica being preferred due to their good usability.

The amount of metal oxide coating in the composite plate-like powder of the present invention is preferably 0.1 to 10 parts by mass of metal oxide per 1 part by mass of the composite plate-like powder. Below the lower limit, the effects of the present invention may not be fully exhibited, which is not preferred. On the other hand, above the upper limit, the cosmetic may feel unnatural when used, which is not preferred.

The powder diameter of the composite plate-like powder of the present invention is preferably in the range of 1.0 to 40 μm in terms of the major axis as observed under an electron microscope. If the powder diameter is below the lower limit, the effect of the present invention may be insufficient, which is not preferred. On the other hand, if it is above the upper limit, it may cause an unpleasant feeling when using the cosmetic product, which is not preferred.

The composite plate-like powder of the present invention is obtained by coating inorganic plate-like powder with a metal oxide by a normal coating method, but since there are also commercially available products, it is also possible to obtain and use these commercially available products. Such commercially available products include "COVERLEAF AR80 (talc coated with titanium dioxide, alumina and silica)", "COVERLEAF PC-2015 (talc coated with titanium dioxide)", "COVERLEAF PC-2035 (talc coated with titanium dioxide)", "COVERLEAF PC-2055 (talc coated with titanium dioxide)", "COVERLEAF PC-1035 (sericite coated with titanium dioxide)" (all manufactured by JGC Catalysts and Chemicals Co., Ltd.), MTE-17Z (mica coated with titanium dioxide treated with metal soap), "MTZE- "07M (silicone-treated titanium oxide, zinc oxide-coated mica)", "MTZE-07EX (isostearic acid-treated titanium oxide, zinc oxide-coated mica)", "SP-100M (titanium oxide-coated mica)", "SMT-57K (13%) (silicone-treated titanium oxide-coated mica)", "SMT-57K (3%) (silicone-treated titanium oxide-coated mica)", "SMT-57S (3%) (silicone-treated titanium oxide-coated mica)" (all manufactured by Teika Corporation), "SAS-TZ-POEDER TYPE 2 (silicone-treated titanium oxide, zinc oxide-coated talc)", "TZ-POWDER Type 2 (silicone-treated titanium oxide, zinc oxide-coated talc)", "TZ-POWDER TYPE 2 (silicone-treated titanium oxide, zinc oxide-coated talc)", "TZ-POWDER TYPE 2B (silicone-treated titanium oxide, zinc oxide-coated talc)", "SA-TTC-30N (silicone, metal soap-treated titanium oxide-coated talc)", "TZ-POWDER TYPE SBN (silicone-treated titanium oxide, zinc oxide-coated talc)", "POWDER LA VIE (zinc oxide, hydroxyapatite-coated sericite)", "SA-POWDER LA Examples include VIE (sericite coated with zinc oxide and hydroxyapatite treated with silicone), BAE-Coverleaf PC-2035 (talc coated with titanium dioxide treated with silicone), SA-Coverleaf PC-2035 (sericite coated with titanium dioxide treated with silicone), SA-Coverleaf PC-2035T (talc coated with titanium dioxide treated with silicone), SA-Coverleaf PC-2045T (talc coated with titanium dioxide treated with silicone), and SA-Pulsea MTS (mica coated with titanium dioxide coated with silicone and metal soap treated with titanium dioxide) (all manufactured by Miyoshi Kasei Co., Ltd.).

The metal oxide content in the composite plate-like powder is preferably 5-20% by mass, more preferably 10-20% by mass, based on the total amount of the solid powder cosmetic, in order to obtain a high SPF.

The content of the composite plate-like powder in the solid powder cosmetic of the present invention is preferably 10 to 70% of the total amount of the cosmetic, and more preferably 10 to 40% by mass. If the content is less than 10% by mass, the effects of the present invention may not be obtained, which is not preferable. On the other hand, if the content exceeds 70% by mass, a decrease in the feeling of use may be observed.

The solid powder cosmetic of the present invention contains spherical silica (hereinafter sometimes abbreviated as specific spherical silica) with an oil absorption of 50 to 350 mL/100 g. As long as the oil absorption is within this range, any of porous, non-porous, and hollow silica can be used. When the solid powder cosmetic of the present invention is in the form of a solid powder, the incorporation of specific silica with a high oil absorption has the effect of improving the feeling of use (loosening) without reducing the drop strength. For this reason, it is preferable that the oil absorption of the specific spherical silica is 90 mL/100 g or more. The oil absorption referred to in the present invention is determined according to JIS K5101 (refined linseed oil).

In addition, the average particle size of the specific spherical silica is preferably 1 to 20 μm in terms of feel on the skin.

In the solid powder cosmetic of the present invention, the specific spherical silica can be used alone or in combination of two or more types. When the solid powder cosmetic of the present invention is in the form of a solid powder, by combining and blending spherical silica with different average particle sizes, and blending a specific silica with high oil absorption, it has the effect of improving loosening without reducing the drop strength. For example, spherical silica with an average particle size of 1 to 5 μm and silica with an average particle size of 5 to 20 μm can be used in combination. In this case, it is preferable to use 0.05 to 10 parts by mass of silica with an average particle size of 5 to 20 μm for 1 part by mass of spherical silica with an average particle size of 1 to 5 μm.

Specific commercially available spherical silica products include Silica Microbead P-1500 (average particle size 5 μm, oil absorption 60 mL/100 g), Silica Microbead P-1505 (average particle size 15 μm, oil absorption 60 mL/100 g), Silica Microbead P-1000 (average particle size 5 μm, oil absorption 60 mL/100 g), Silica Microbead P-500 (average particle size 2 μm, oil absorption 60 mL/100 g), Silica Microbead P-4000 (average particle size 20 μm, oil absorption 60 mL/100 g), Silica Microbead BA-1 (average particle size 16 μm, oil absorption 70 mL/100 g), SATINER M5 (average particle size 10 μm, oil absorption 60 mL/100 g), SATINER M13 (average particle diameter 17 μm, oil absorption 60 mL/100 g), BA4 (average particle diameter 4 μm, oil absorption 50 mL/100 g) (manufactured by JGC Catalysts & Chemicals), Cosme Silica BQ-60 (average particle diameter 55 μm, oil absorption 70 mL/100 g) (manufactured by Fuji Silicia Chemical Co., Ltd.), God Ball E-2C (average particle diameter 1 μm, oil absorption 180 mL/100 g), God Ball E-6C (average particle size 2 μm, oil absorption 120 mL/100 g), God Ball D-11C (average particle size 3 μm, oil absorption 100 mL) /100g), God Ball D-25C (average particle size 9 μm, oil absorption 90 mL/100 g), God Ball E-16C (average particle size 5 μm, oil absorption 110 mL/100 g), God Ball B-6C (average particle size 2 μm, oil absorption 140 mL/100 g), God Ball SF-16C (average particle size 5 μm, oil absorption 350 mL/100 g), God Ball AF-6C (average particle size 3 μm, oil absorption 300 mL/100 g), God Ball AF-16C (average particle size 5 μm, oil absorption 300 mL/100 g) /100g), God Ball B-25C (average particle size 9μm, oil absorption 170mL/100g) (manufactured by Suzuki Yushi Kogyo Co., Ltd.), Sunsphere H-31 (average particle size 3μm, oil absorption 150mL/100g), Sunsphere H-51 (average particle size 5μm, oil absorption 150mL/100g), Sunsphere H-121 (average particle size 12 μm, oil absorption 150mL/100g), Sunsphere H-201 (average particle diameter 20μm, oil absorption 150mL/100g), Sunsphere L-31 (average particle diameter 3 μm, oil absorption 150 mL/100 g), Sansphere L-51 (average particle size 5 μm, oil absorption 150 mL/100 g), Sansphere H-32 (average particle size 3 μm, oil absorption 300 mL/100 g), Sansphere H-52 (average particle size 5 μm, oil absorption 300 mL/100 g), Sansphere H-122 (average particle size Examples include Sunsphere H-202 (average particle size 20 μm, oil absorption 300 mL/100 g) (manufactured by Asahi Glass Co., Ltd.).

The amount of the specific spherical silica in the solid powder cosmetic of the present invention varies depending on the formulation, but is preferably 0.2 to 30% by mass, and more preferably 0.3 to 20% by mass.

The solid powder cosmetic of the present invention preferably has an SPF of 60 or more as measured according to ISO standard 24444:2010. In order to achieve this SPF, a composite plate-like powder is used in combination with a specific spherical silica having a specific oil absorption. In addition, a high SPF is obtained by not including microplastic beads.

The solid powder cosmetic of the present invention preferably contains zinc oxide-coated spherical powder. Zinc oxide-coated spherical powder has the ability to solidify sebum, and is expected to have the effect of improving the durability of makeup.

The spherical powder used in the zinc oxide-coated spherical powder is preferably one or more selected from metal salts of alkenyl succinic acid starch esters and spherical borosilicate powders, in terms of improving the cosmetic durability.

The zinc oxide used in the zinc oxide-coated spherical powder is not particularly limited as long as it can be incorporated into a solid powder cosmetic. The shape of the zinc oxide is not particularly limited. From the viewpoint of sebum solidification ability, the average particle size of the zinc oxide is preferably 10 to 200 nm, more preferably 15 to 100 nm, and even more preferably 15 to 50 nm.

The zinc oxide-coated spherical powder can be obtained, for example, by coating a spherical powder with zinc oxide.
Although untreated zinc oxide can be used as is, it is preferable to use zinc oxide that has been subjected to a hydrophobic treatment. The hydrophobic treatment agent is not particularly limited, and examples thereof include dimethicone, methyl hydrogen polysiloxane, and metal soap. Among these hydrophobic treatment agents, it is preferable to use dimethicone. The coating amount of the hydrophobic treatment agent may be an amount sufficient to hydrophobize the zinc oxide. Specifically, the mass ratio of zinc oxide to the hydrophobic treatment agent is preferably 85:15 to 99:1, and more preferably 90:10 to 98:2.

In the zinc oxide-coated spherical powder used in the solid powder cosmetic of the present invention, the amount of zinc oxide coated per part by mass of the spherical powder is preferably 0.01 parts by mass or more, more preferably 0.05 parts by mass or more. Also, the amount of zinc oxide coated per part by mass of the spherical powder is preferably 2 parts by mass or less, more preferably 1.5 parts by mass or less. Within this range, the sebum solidifying ability can be further enhanced, and sebum breakdown can be further prevented.
The coating amount of zinc oxide is preferably 0.01 to 2 parts by mass, and more preferably 0.05 to 1.5 parts by mass, per part by mass of the spherical powder.

As a method for coating the spherical powder with zinc oxide, various methods known so far can be used, such as physicochemical mixing and grinding methods (dry and wet), chemical deposition methods, etc. From the viewpoint of the sebum solidification ability of the zinc oxide-coated spherical powder, the dry mixing and grinding method is preferably used.

Commercially available zinc oxide-coated spherical powders include Pulsair OPZ-NV and Pulsair CBZ-NV (both manufactured by Suzuki Oil Industries Co., Ltd.).

The solid powder cosmetic preparation of the present invention may contain solid spherical borosilicate powder.
The average particle size of the solid spherical borosilicate powder is preferably 0.1 μm or more, more preferably 1 μm or more, even more preferably 5 μm or more, and even more preferably 7 μm or more. The average particle size of the solid spherical borosilicate powder is preferably 20 μm or less, more preferably 15 μm or less, and even more preferably 13 μm or less. For example, from the viewpoint of the stickiness reduction effect, the average particle size of the solid spherical borosilicate powder is preferably 1 to 20 μm, more preferably 5 to 15 μm, and even more preferably 7 to 13 μm.

In the solid spherical borosilicate powder, the borosilicate may be an alkali metal salt such as Na or K, an alkaline earth metal salt such as Mg or Ca, an Al salt, or a combination of these salts. Preferably, it is Na borosilicate, Ca borosilicate, Al borosilicate, borosilicate (Ca/Na), or borosilicate (Ca/Al), and more preferably it is borosilicate (Ca/Na).
The solid spherical borosilicate powder is indicated by the cosmetic name (INCI name) as borosilicate (Ca/Na) (CALCIUM SODIUM BOROSILICATE), borosilicate (Ca/Al) (CALCIUM ALUMINUM BOROSILICATE), etc., and in the present invention, a solid spherical borosilicate powder having any name may be used, with the use of borosilicate (Ca/Na) being more preferable.

The solid spherical borosilicate powder may be untreated or may have been subjected to a hydrophilic or hydrophobic treatment.

It is preferable to blend mica in the solid powder cosmetic composition of the present invention.
There are no particular limitations on the mica as long as it can be incorporated into cosmetics, and any of mica, sericite, and synthetic phlogopite may be used. These may be used alone or in combination of two or more types for the purpose of adjusting the balance between the loosening and the drop strength of the solid powder cosmetic.

It is preferable to incorporate talc into the solid powder cosmetic of the present invention. The amount of talc incorporated varies depending on the balance between loosening and drop strength.

The solid powder cosmetic of the present invention can contain an organic UV absorber.

The type of organic UV absorber is not particularly limited, and known organic UV absorbers can be used without restriction. Examples of such known organic UV absorbers include cinnamic acid derivatives such as 2-ethylhexyl paramethoxycinnamate, isopropyl methoxycinnamate, and isoamyl methoxycinnamate; PABA derivatives such as paraaminobenzoic acid (hereinafter abbreviated as "PABA"), ethyl PABA, ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA, and glyceryl PABA; salicylic acid derivatives such as homosalate, ethylhexyl salicylate, dipropylene glycol salicylate, and TEA salicylate; benzophenone-1, benzophenone-2, benzophenone- 3 or oxybenzone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9, benzophenone-12 and other benzophenone derivatives; 3-benzylidene camphor, 4-methylbenzylidene camphor, benzylidene camphorsulfonic acid, camphor benzalkonium methosulfate, terephthalidene discamphorsulfonic acid, polyacrylamide methyl benzylidene camphor, and other benzylidene camphor derivatives; anisotriazine, diethylhexylbutamido triazone, 2,4,6-tris(diisobutyl-4'- aminobenzalmalonate)-s-triazine, 2,4-bis-[{4-(2-ethylhexyloxy)-2-hydroxy}-phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine and other triazine derivatives; phenylbenzimidazole derivatives such as phenyldibenzimidazole tetrasulfonate disodium; phenylbenzotriazoles such as drometrizole trisiloxane and methylenebis(benzotriazolyltetramethylbutylphenol) Derivatives; anthranil derivatives such as menthyl anthranilate; imidazoline derivatives such as 2-ethylhexyl dimethoxybenzylideneoxoimidazolidinepropionate; benzalmalonate derivatives such as polyorganosiloxanes having benzalmalonate functional groups; 4,4-diarylbutadiene derivatives such as 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene; octocrylene, 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate, 4-tert-butyl-4'-methoxydibenzoylmethane, etc. The organic UV absorbers can be used alone or in combination of two or more.

When an organic UV absorber is added, the amount is preferably 0.1 to 20% by mass.

The solid powder cosmetic of the present invention can contain powders other than the above powders as long as the effects of the present invention are not impaired. Examples of powders that can be contained in the present invention include inorganic pigments such as titanium oxide, red iron oxide, yellow iron oxide, black iron oxide, zinc oxide, cerium oxide, manganese violet, cobalt violet, chromium oxide, chromium hydroxide, cobalt titanate, ultramarine, Prussian blue, magnesium oxide, zirconium oxide, talc, kaolin, sericite, muscovite, phlogopite, synthetic mica, red mica, biotite, vermiculite, silica, calcium carbonate, magnesium carbonate, magnesium silicate, aluminum silicate, barium silicate, calcium silicate, barium sulfate, calcium sulfate, calcium phosphate, hydroxyapatite, boron nitride, pearl pigments, and bismuth oxychloride, as well as inorganic pigments such as Red No. 3 and Red No. 10. Examples include organic dyes such as Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 227, Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Yellow No. 205, Yellow No. 401, Orange No. 201, Orange No. 203, Orange No. 204, Orange No. 205, Orange No. 206, Orange No. 207, Blue No. 1, Blue No. 2, Blue No. 201, Blue No. 404, Green No. 3, Green No. 201, Green No. 204, and Green No. 205; natural dyes such as chlorophyll and β-carotene; and metal soaps such as zinc myristate, calcium palmitate, and aluminum stearate.

The solid powder cosmetic of the present invention can be blended with ingredients that can be blended in regular solid powder cosmetics. For example, powder ingredients other than those mentioned above, oily ingredients, moisturizers, colorants, surfactants, UV absorbers, thickeners, cosmetic ingredients, fragrances, polymeric substances, antibacterial and antifungal agents, alcohols, scrubbing agents, biologically derived ingredients, etc. can be blended as appropriate.

The method for producing the solid powder cosmetic of the present invention is not particularly limited. For example, the powder may be mixed with other ingredients as required and then pressed into a metal plate, or a wet method may be used in which the powder is mixed with a solvent to form a slurry, which is then filled into a metal plate, after which the solvent is removed and the mixture is molded. Alternatively, the powder may be supported on a support such as paper.

The solid powder cosmetic of the present invention can be implemented as a sunscreen, foundation, concealer, face powder, blusher, eye shadow, eyebrow, lipstick, etc., and is preferably a foundation, face powder, or blusher, since it can exhibit a UV blocking effect.

The evaluation methods of the examples will be described.
[Usage]
Three sensory evaluators specializing in makeup evaluated, in a consensus manner, the loosening of the solid powder cosmetic preparation when used with a sponge puff as follows.
"◎": Very good loosening "○": Good loosening "△": Not very good loosening "×": Very poor loosening [Drop strength]
The solid powder cosmetic was loaded into a specified container and dropped horizontally from a height of 50 cm. The number of times it took for the state of the pressed surface to change was tested and evaluated as follows.
"○": 50cm 10 times or more "△": 50cm 5 times or more "×": 50cm 2 times or less

Solid powder cosmetics were prepared according to the formula shown in Table 1 by a standard method, and pressed into a metal dish with a major axis of 5.35 cm and a minor axis of 4.50 cm at a pressure of 25 kgf/ ^cm2 . The solid powder cosmetics were then loaded into a specified container and subjected to testing.

Note 1: Powder obtained by compounding 15 parts by mass of talc, 45 parts by mass of fine titanium oxide, and 35 parts by mass of fine zinc oxide, and surface-treating the powder with 5 parts by mass of silicone oil. Note 2: Powder obtained by compounding 68 parts by mass of talc, 28 parts by mass of fine titanium oxide, and surface-treating the powder with 4 parts by mass of magnesium stearate. Note 3: Powder obtained by compounding 30 parts by mass of mica, 65 parts by mass of fine titanium oxide, and surface-treating the powder with 5 parts by mass of silicone oil. Note 4: Powder obtained by compounding 90 parts by mass of sericite, and 5 parts by mass of fine zinc oxide, and surface-treating the powder with 5 parts by mass of silicone oil. Note 5: Sunsphere H-31 (average particle size 3 μm, oil absorption 150 mL/100 g, manufactured by Asahi Glass Co., Ltd.)
Note 6: Sunsphere H-121 (average particle size 12 μm, oil absorption 150 mL/100 g, manufactured by Asahi Glass Co., Ltd.)
Note 7: Sunsphere NP-30 (average particle size 3 μm, oil absorption 30 mL/100 g, manufactured by Asahi Glass Co., Ltd.)
Note 8: Sunsphere NP-100 (average particle size 10 μm, oil absorption 35 mL/100 g, manufactured by Asahi Glass Co., Ltd.)
Note 9: Pulsea CBZ-NV (manufactured by Suzuki Oil Industries Co., Ltd.)
Note 10: COVABEAD CRYSTAL (manufactured by SENSIENT COSMETIC TECHNOLOGIES)
Note 11: PRESS-AID SP (MICRO POWDERS)
Note 12: SA-Titanium CR-50 (100%) (manufactured by Miyoshi Chemical Industries, Ltd.)
Note 13: SH200C-100cSt (manufactured by Dow Chemical)
Note 14: KF7312K (Shin-Etsu Chemical Co., Ltd.)

The solid powder cosmetic of the present invention, which contains highly oil-absorbent silica, has a good feel when used and exhibits a high ultraviolet shielding effect compared to when low-oil-absorbent silica is used.

The UV protection effect was measured in vitro using an SPF analyzer (UV-2000S, Labsphere) for Example 1 and Comparative Example 3 shown in Table 2. The measurement conditions were as follows: the sample shown in Table 2 was uniformly applied to Blenderm Surgical Tape (M3) at a rate of 2 mg/ ^cm2 , and the SPF value in the range of 290 to 400 nm was measured using the above-mentioned measuring device.

As shown in Table 2, the SPF of Comparative Example 3, which contained plastic microbeads, was only about two-thirds that of Example 1.

An in vivo SPF test was conducted on a face powder (Test Example 1) with a formulation similar to that of the solid powder cosmetic product shown in Example 1, in accordance with ISO24444:2010. The results are shown in Table 3.

Claims (1)

A solid powder cosmetic preparation comprising (A) , (B) and (C) and not containing plastic microbeads.
(A) A metal oxide-coated inorganic plate-like powder, in which the content of fine metal oxide particles contained in the metal oxide-coated inorganic plate-like powder is 10 to 20% by mass based on the total amount of the solid powder cosmetic. (B) Spherical silica having an oil absorption of 50 to 350 mL/100 g.
(C) A spherical powder obtained by coating zinc oxide on one or more types of spherical powder selected from an alkenyl succinic acid starch ester metal salt and a spherical borosilicate powder.