JP7120777B2 - Metal sulfate particles, cosmetics containing the same - Google Patents

Description

The present invention relates to spherical particles of a metal sulfate, which is a trivalent metal sulfate. It also relates to a cosmetic containing spherical particles of this metal sulfate.

Body odors such as armpit odors, sweat odors, and foot odors make people around people feel uncomfortable. Therefore, deodorant cosmetics for deodorizing and deodorizing body odors have been developed. Lower fatty acids such as isovaleric acid and caproic acid, nitrogen-containing compounds such as ammonia and butylamine, sulfur-containing compounds such as indole and ethyl mercaptan, volatile steroid compounds, and nonenal are known to cause body odor. As deodorant products for deodorizing these body odors, there are antiperspirants that suppress sweating by using astringent aluminum compounds, and antibacterial ingredients that prevent the growth of bacteria to prevent perspiration and sebum. Bactericides that prevent decomposition, deodorants that eliminate odors generated by using metal oxides, plant extracts, etc., and masking agents that mask odors using fragrances are known. For example, Patent Document 1 discloses a deodorant cosmetic containing magnesium oxide powder as an active ingredient. In this deodorant cosmetic, magnesium oxide exhibits a deodorant effect by neutralizing lower fatty acids, which are the main component of sweat odor. However, it could not sufficiently deal with body odors such as ammonia.

Aluminum sulfate salts such as aluminum potassium sulfate and aluminum ammonium sulfate are known as astringent aluminum compounds. Aluminum sulfate is supplied in various forms such as liquid, powder, and block. For example, Patent Literature 2 describes a block-shaped aluminum sulfate salt obtained by adding dry pulverized powder of potassium aluminum sulfate to a hot solution of potassium aluminum sulfate and solidifying a slurry liquid by standing to cool.

JP-A-2001-187721 Japanese Patent Application Laid-Open No. 2002-193615

Deodorant cosmetics are required to deodorize body odors derived from basic substances such as ammonia. In order to deodorize these basic substances, a method of adding an acidic substance or the like to neutralize them is conceivable. Here, the present inventors paid attention to the fact that metal sulfate, which is a sulfate of a trivalent metal salt, is acidic, and used particles of this metal sulfate to eliminate body odor caused by basic substances such as ammonia. Considered smelling. Basic substances such as ammonia accumulate in the skin grooves and pores together with sweat, so by approaching the metal sulfate particles to the skin grooves and pores, it is possible to exert an effective deodorant effect. it is conceivable that. However, conventional metal sulfates supplied in the form of powder are prepared by pulverization and thus have a polyhedral shape with corners. There is a problem that grooves and pores cannot be sufficiently approached.

Accordingly, an object of the present invention is to provide metal sulfate particles that, when applied to the skin, can approach the cuticle and pores of the skin and effectively neutralize basic substances such as ammonia. That's what it is.

The inventors of the present invention have made intensive studies to solve the above problems, and found that the above problems can be solved by making the metal sulfate particles spherical and having a median diameter of 200 μm or less, and completed the present invention. came to.
That is, the present invention is the following metal sulfate particles and cosmetics containing the same.

The metal sulfate particles of the present invention are particles of a metal sulfate that is a sulfate of a trivalent metal salt, characterized in that the particles have a spherical shape and a median diameter of 200 μm or less.
According to this feature, since the particles have a spherical shape, the particles slide well when applied to the skin, and the particles can sufficiently approach the skin grooves and pores. In addition, it is possible to impart a smooth feel to the skin since it has good slipperiness when applied.
In addition, the size of the pores and the width of the sulcus are several hundred microns, although they vary depending on the skin type. Therefore, by setting the particle diameter of the metal sulfate particles to be 200 μm or less as a median diameter, when applied to the skin, many of the metal sulfate particles can get stuck in the pores and sulcus cutis and remain in the pores and sulcus cutis. can. Therefore, it is possible to effectively neutralize basic substances such as ammonia contained in sweat accumulated in the pores and grooves.
In addition, since the metal sulfate particles of the present invention are likely to remain in pores and sulcus cutis, an effect of tightening pores and sulcus cutis is also expected due to its astringent action.
In addition, since the metal sulfate particles of the present invention have a spherical shape, they have good fluidity and are excellent in handleability in the production of cosmetics.

Furthermore, one embodiment of the metal sulfate particles of the present invention is characterized by being hollow.
According to this feature, since the surface area is large, the property of easily dissolving in sweat is imparted. Therefore, it quickly dissolves in the sweat accumulated in the skin grooves and pores, and can neutralize basic substances such as ammonia.

Furthermore, one embodiment of the metal sulfate particles of the present invention is characterized by being a hydrate.
According to this feature, since it has excellent solubility, it quickly dissolves in sweat accumulated in the skin grooves and pores, and can neutralize basic substances such as ammonia.

Furthermore, one embodiment of the metal sulfate particles of the present invention is characterized by being an anhydride.
According to this feature, since the deliquescence is small, there is an effect that the storage stability of the product is excellent.

The cosmetic of the present invention is characterized by containing the metal sulfate particles described above.
According to this feature, since the metal sulfate particles can sufficiently approach the pores and sulci, the makeup can effectively neutralize basic substances such as ammonia accumulated in the pores and sulci. fee can be provided. In addition, according to this cosmetic, since the metal sulfate particles having astringent action can approach the pores and sulci, it is possible to provide a cosmetic that can effectively tighten the pores and sulci. can.

Furthermore, one embodiment of the cosmetic of the present invention is characterized by being an antiperspirant, body powder, face powder, foundation, makeup base, or blush.
According to this feature, the metal sulfate particles are retained in the pores and sulcus, and the effect of effectively neutralizing basic substances such as ammonia and the effect of effectively tightening the pores and sulcus are exhibited. can do.

According to the present invention, it is possible to provide particles of a metal sulfate that, when applied to the skin, approach the sulcus cutis and pores of the skin and can effectively neutralize basic substances such as ammonia. can.

It is a schematic explanatory drawing which shows the structure of skin. It is a schematic explanatory drawing which shows a mode that sweat flows into a cutis cutis. FIG. 4 is a schematic explanatory diagram showing a state in which spherical metal sulfate particles approach pores. 1 is an SEM image of spherical aluminum potassium sulfate particles. 1 is an SEM image of hollow aluminum potassium sulfate particles. 1 is an SEM image of non-spherical aluminum potassium sulfate particles. FIG. 2 is a schematic illustration for measuring the mean coefficient of friction (MIU) of particles;

Next, the present invention will be described including the best mode for carrying it out.
[Metal sulfate particles]
The metal sulfate particles of the present invention are particles of a metal sulfate that is a sulfate of a trivalent metal salt, characterized in that the particles have a spherical shape and a median diameter of 200 μm or less.
According to this feature, the particles have a spherical shape and a median diameter of 200 μm or less, so that the particles slide well when applied to the skin and can sufficiently approach the pores and sulcus cutis. Then, it dissolves in the sweat accumulated in the pores and cutaneous grooves, and can effectively neutralize basic substances such as ammonia in the sweat.

The mechanism of sweating and the action of the metal sulfate particles of the present invention will be explained with reference to the drawings. FIG. 1 is a schematic illustration showing the structure of the skin. As shown in FIG. 1 , the skin was formed in an area where the cutis cutis 20 intersects with the cutis cutis 20 formed in the epidermis, the cuticle 30 formed in the region surrounded by the cutis cutis 20, and the cutis cutis sulcus 20. It has pores 10. There are hair roots in the deep layers of the pores 10, and hair grows from the pores 10. - 特許庁

Sweat is known to come from two types of sweat glands: eccrine glands and apocrine glands. Eccrine glands are sweat glands that are distributed almost all over the body and are mainly used for sweating to regulate body temperature. The eccrine glands are open to the colic 30, and sweat from the eccrine glands flows into the sulcus cutis 20, flows through the sulcus cutis 20, and accumulates in the pores 10 (see FIG. 2). The sweat produced from the eccrine glands is colorless and odorless, and contains almost no odorous components.
On the other hand, apocrine glands are sweat glands that are abundantly present in specific sites such as armpits, nipples, and lower abdomen. In addition, the apocrine glands are open to the hair roots, and the perspiration from the apocrine glands accumulates in the pores 10 as it is. It is known that sweat from apocrine glands contains components such as lipids and proteins, and these components are likely to be decomposed by microorganisms and the like to become odor-causing components.

As shown in FIG. 3 , the metal sulfate particles of the present invention have a spherical particle shape, so when applied to the skin, they roll on the skin bumps 30 and can sufficiently approach the pores 10 . In addition, the metal sulfate particles accumulated in the sulcus cutis 20 can also flow with sweat and approach the pores 10 . In the pores 10, it is possible to effectively neutralize basic substances such as ammonia, which are odor-causing components in sweat.

<Metal sulfate>
The metal sulfates of the present invention are sulfates of trivalent metal salts. The metal sulfate of the present invention may also be a double salt of a trivalent metal sulfate and a monovalent cation sulfate. Examples of trivalent metal salts include, but are not limited to, aluminum ions and iron ions. From the viewpoint that an astringent effect is also imparted, it is preferable that aluminum ions are included.
The monovalent cation is not particularly limited, but examples include monovalent metal ions such as potassium and sodium, and ammonium ions. From the viewpoint of suppressing odor, it is preferable to contain monovalent metal ions such as potassium and sodium.

Preferred are compounds represented by the following chemical formula (1).
M ¹⁺ M ³⁺ (SO ₄ ) ₂ or M ³⁺ ₂ (SO ₄ ) ₃ (1)
[wherein M ¹⁺ is K ⁺ , Na ⁺ , NH ₄ ⁺ or a mixture thereof. M ³⁺ is Al ³⁺ , Fe ³⁺ or mixtures thereof. ]
More preferred are aluminum sulfate salts, more preferred are ammonium aluminum sulfate, sodium aluminum sulfate and potassium aluminum sulfate, and particularly preferred are sodium aluminum sulfate and potassium aluminum sulfate.

The metal sulfate of the present invention may be either a hydrate or an anhydride.
A hydrate is a substance containing water, and includes hydrates such as monohydrate and dihydrate, depending on the number of waters of hydration. In the hydrate of the present invention, the number of waters of hydration is not particularly limited, but octahydrate and dodecahydrate are preferred. Since the hydrate of metal sulfate has excellent solubility in water, it quickly dissolves in the sweat accumulated in the skin grooves and pores, and can further exhibit the effect of neutralizing basic substances such as ammonia. .

Anhydrous is a state in which a substance containing water of crystallization or water of hydration has lost its water. By making the metal sulfate anhydride, the solubility in water or the like is reduced, and deliquescence can be prevented. Therefore, it is possible to maintain stable quality as a stick antiperspirant or the like.

The metal sulfate particles of the present invention have a median diameter of 200 μm or less and a spherical shape. A spherical shape does not mean only a true spherical shape, and may be an elliptical shape, a substantially spherical shape, or a shape having minute holes or irregularities on the surface. In the case of an elliptical shape or a substantially spherical shape, it is preferable that the shape is spherical if the ratio of the minor axis to the major axis is 1:1 to 1:2.

The lower limit of the median diameter is preferably 1 µm or more, more preferably 3 µm or more, and particularly preferably 5 µm or more. The upper limit is preferably 100 µm or less, more preferably 50 µm or less, and particularly preferably 30 µm or less.
By setting the median diameter of the metal sulfate particles within the above range, when applied to the skin, many metal sulfate particles can be stuck in the pores and sulci and remain in the pores and sulci. Therefore, it is possible to effectively neutralize basic substances such as ammonia contained in sweat accumulated in the pores and grooves.
In addition, the median diameter of the present invention is a volume median diameter (VMD) obtained by measuring using a laser diffraction/scattering method (particle size distribution measuring device HELOS; manufactured by Japan Laser Co., Ltd.). .

Further, the shape of the metal sulfate particles of the present invention is preferably hollow.
The term “hollow” refers to a state in which primary particles are present only in the surface layer of the spherical portion and has an internal space, and the shell between the internal space and the external space has an opening. good too.
The film thickness of the surface layer portion is not particularly limited, but is preferably about 0.1 μm to 5 μm.
By forming the metal sulfate particles into hollow particles, the surface area is increased, so that the property of being easily dissolved in sweat can be imparted. Therefore, it quickly dissolves in the sweat accumulated in the skin grooves and pores, and can neutralize basic substances such as ammonia.

[Method for producing metal sulfate particles]
A method for preparing spherical metal sulfate particles is not particularly limited, but a generally known granulation method such as a spray drying method, a fluidized bed granulation method, or the like can be used. In particular, it is preferable to use a spray drying method because the component can be formed into spheres with good appearance.

For example, the following method can be used to prepare spherical particles by spray drying. First, a metal sulfate is dissolved or uniformly dispersed in one or more dispersion solvents such as water, ethanol, isopropyl alcohol, and acetone to prepare a metal sulfate solution or slurry.

When preparing the solution or slurry of this metal sulfate, excipients and the like may be added as necessary. Excipients are substances that do not have physiological activity, such as starch, dextrin, lactose, maltose, glucose, maltitol, sorbitol, and the like. By adding excipients, it is possible to adjust the shape of the particles, the solubility of the metal sulfate particles, and the like.

The concentration of the metal sulfate solution is not particularly limited, but is generally 1 to 80% by mass. The lower limit is preferably 3% by mass or more, more preferably 5% by mass or more, and particularly preferably 8% by mass or more. The upper limit is preferably 60% by mass or less, more preferably 50% by mass or less, and particularly preferably 45% by mass or less. Productivity is improved by increasing the concentration of the solution. On the other hand, when the concentration of the solution is lowered, adhesion of the particles to each other during the spray-drying process can be prevented, and spherical particles with excellent appearance can be obtained.
The hollow particles can be obtained by adjusting the concentration of the metal sulfate solution, the type of solvent, and the like.

Next, the metal sulfate solution or slurry is subjected to a spheroidizing treatment using the above spray drying method (spray drying method) or the like. The temperature of the hot air in the spray drying is preferably 150-300°C, more preferably 200-250°C.

Finally, the spheroidized particles may be sintered using a heat treatment furnace or the like. Sintering is performed in an inert gas atmosphere such as nitrogen or argon. The sintering temperature is preferably 100-500°C, more preferably 200-300°C. The time required for this sintering is preferably about 5 to 15 hours.

By this sintering, spherical particles can be obtained and impurities caused by the granulation process can also be removed.
Furthermore, by controlling the sintering conditions, a hydrate or an anhydride of the metal sulfate can be produced.
In addition, the obtained spherical particles can be classified and used as necessary.

[Cosmetics Containing Metal Sulfate Particles]
Although the cosmetic of the present invention is not particularly limited, it can be suitably used as a cosmetic for deodorizing or for tightening pores by astringent action. Examples include antiperspirants, body powders, face powders, foundations, makeup bases, cheeks, and the like.

Next, the cosmetic of the present invention will be specifically described.
<Antiperspirant>
Antiperspirants refer to products capable of producing an antiperspirant effect when the antiperspirant agent is sprayed, applied, or adhered to the skin.
Examples of forms of antiperspirants include stick types, gel types, and cream types that are directly applied to the skin, and aerosol and non-aerosol types that are sprayed onto the skin.

<body powder>
Body powder is a cosmetic used to reduce oily glare and give a matte, natural finish.

<Face powder>
A face powder is a cosmetic that is used to finish makeup and suppresses the shine and stickiness of sebum and foundation.

<Foundation>
A foundation has functions such as adjusting the color of the skin, covering spots, freckles, etc., protecting the skin from ultraviolet rays, and protecting it from external stress. This makeup cosmetic is applied after applying a makeup base to the skin.

<Makeup base>
A makeup base is used as a base before applying makeup products. It is a cosmetic that is used for the purpose of maintaining the effect of makeup by preventing makeup from coming off and preventing makeup from coming off.

<cheek>
Blush is blush, and is a cosmetic that is applied to the cheeks to make the complexion look brighter or to add shading to create a three-dimensional effect. Dosage forms include solid, cream, liquid, stick, and the like.

The content of the metal sulfate particles in the cosmetic of the present invention is not particularly limited, but is preferably 0.1 to 100.0% by mass. The lower limit is more preferably 1.0% by mass or more, still more preferably 5.0% by mass or more, and particularly preferably 10.0% by mass or more. The upper limit is more preferably 50.0% by mass or less, still more preferably 30% by mass or less, and particularly preferably 20.0% by mass or less. Within the above range, the effect of neutralizing basic substances such as ammonia in sweat accumulated in pores and the effect of tightening pores due to astringent action are sufficiently exhibited.

The cosmetic composition of the present invention may contain other ingredients commonly used in cosmetics, depending on the application. For example, inorganic pigments, extender pigments, polymer powders, oily raw materials, surfactants, humectants, thickeners, polymers, UV protection agents, antioxidants, antioxidant aids, sequestering agents, stearic acid Metallic soaps such as magnesium, whitening agents, anti-wrinkle agents, rough skin improving agents, acne agents, deodorizing agents, cooling agents, astringents, antibacterial agents, organic pigments, natural pigments, fragrances, vitamins, emollients etc.

Examples of inorganic pigments include extender pigments, color pigments, and white pigments.
Extender pigments are used to maintain the dosage form of the product, and can be used to adjust the usability (spreadability, adhesion) and gloss of the product. Specific examples include mica, sericite, talc, kaolin, synthetic phlogopite, calcium carbonate, magnesium carbonate, silicic anhydride, aluminum oxide, and barium sulfate.
Coloring pigments adjust the color tone of products, and specific examples include red iron oxide, yellow iron oxide, black iron oxide, chromium oxide, ultramarine blue, Prussian blue, and carbon black.
The white pigment plays a role of adjusting the color tone of the product and also can adjust the hiding power, and specific examples thereof include titanium dioxide and zinc oxide.

Specific examples of the polymer powder include polyethylene powder, polymethyl methacrylate powder, polyethylene terephthalate/polymethyl methacrylate laminate powder, nylon powder, polyurethane powder, and silicone powder.

Oily raw materials include fats, waxes, hydrocarbons, higher fatty acids, higher alcohols, esters, silicone oils and the like. More specifically, fats and oils include olive oil, camellia oil, macadamia nut oil, castor oil, etc. Waxes include carnauba wax, candelilla wax, jojoba oil, beeswax, lanolin, etc. Hydrocarbons include liquid paraffin and paraffin. , Vaseline, ceresin, microcrystalline wax, squalane, etc. Higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, etc. Higher alcohols include cetyl alcohol, stearyl alcohol, isostearyl alcohol, 2- Octyldodecanol and the like, esters such as isopropyl myristate, 2-octyldodecyl myristate, cetyl 2-ethylhexanoate, and diisostearyl malate, and silicone oils such as methylpolysiloxane, methylphenylpolysiloxane, deca Examples include methylcyclopentasiloxane and highly polymerized methylpolysiloxane.

Surfactants include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants. More specifically, anionic surfactants include higher fatty acid soaps, alkyl sulfates, polyoxyalkyl ether sulfates, acyl N-methyl taurate, alkyl ether phosphates, N-acyl amino acid salts, etc. Examples of cationic surfactants include alkyltrimethylammonium chloride, dialkyldimethylammonium chloride, and benzalkonium chloride. Examples of amphoteric surfactants include alkyldimethylamino betaine, alkylamidopropyldimethylamino betaine, 2-alkyl-N- Examples of nonionic surfactants such as carboxymethyl-N-hydroxyethylimidazolinium betaine include polyoxyethylene type, polyhydric alcohol ester type, and ethylene oxide/propylene oxide block copolymers.

Moisturizers include, for example, glycerin, propylene glycol, dipropylene glycol, 1,3-butylene glycol, polyethylene glycol, sorbitol, sodium lactate, sodium 2-pyrrolidone-5-carboxylate, sodium hyaluronate and the like.

Thickeners include, for example, quince seed gum, xanthan gum, carboxymethylcellulose sodium, carboxyvinyl polymer and the like.

Examples of polymers include polyvinyl alcohol, polyvinylpyrrolidone, nitrocellulose, high-molecular silicone, and the like.

Examples of UV protection agents include UV absorbers such as benzophenone derivatives, para-aminobenzoic acid derivatives, methoxycinnamic acid derivatives and salicylic acid derivatives, and UV scattering agents such as microparticle titanium oxide, microparticle zinc oxide and microparticle iron oxide.

Examples of antioxidants include tocopherols, BHT, gallic acid esters, and the like. Examples of antioxidant aids include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, and ethylenediaminetetraacetic acid (EDTA). mentioned.

Examples of sequestering agents include sodium ethylenediaminetetraacetate, phosphoric acid, citric acid, ascorbic acid, succinic acid, gluconic acid, sodium polyphosphate, sodium metaphosphate and the like.

Whitening agents include, for example, vitamin Cs, arbutin, kojic acid, ellagic acid, rucinol and the like.

Anti-wrinkle agents include, for example, retinoids (vitamin A), α-hydroxy acids and the like.

Examples of rough skin ameliorating agents include β-glycyrrhetinic acid, glycyrrhizic acid derivatives, allantoin, azulene, anti-inflammatory agents such as hydrocortisone, and protease inhibitors.

Acne agents include, for example, estradiol, estrone, ethinyl estradiol, sebum-suppressing ingredients such as vitamin B6, keratin-exfoliating/dissolving ingredients such as sulfur, salicylic acid, resorcinol, benzalkonium chloride, benzethonium chloride, halocarban, 2,4 , 4-trichloro-2-hydroxyphenol, and anti-inflammatory ingredients such as glycyrrhizic acid and glycyrrhetinic acid.

Deodorant agents include, for example, antiperspirant components such as chlorohydroxyaluminum, aluminum chloride, allantoin chlorohydroxyaluminum, zinc oxide, zinc paraphenolsulfonate, silver-containing zeolite, benzalkonium chloride, isopropylmethylphenol, benzethonium chloride, Halocarban, bactericidal components such as chlorhexidine hydrochloride, deodorant components such as polyphenolic persimmon tannins and tea catechins, antioxidant components such as thiotaurine, hypotaurine, and tocopherol.

Cooling agents include, for example, menthol and camphor.

Examples of astringents include zinc oxide, zinc sulfate, allantoin hydroxyaluminum, aluminum chloride, zinc sulfocarbate, tannic acid, citric acid, and lactic acid.

Antibacterial agents include benzoic acid and its salts, salicylic acid and its salts, phenol, sorbic acid and its salts, dehydroacetic acid and its salts, parabens, chlorcresol, hexachlorophene, resorcinol, isopropylmethylphenol, orthophenylphenol, chloride Benzalkonium, chlorhexidine hydrochloride, chlorhexidine gluconate, alkylisoquinolinium bromide, trichlorocarbanilide, halocarban, photosensitizer No. 201, phenoxyethanol, triclosan, methylchloroisothiazolinone/methylisothiazolinone liquid, bisabolol, Alkyldiaminoethylglycine hydrochloride, trichloro-salicylanilide, tribromo-salicylanilide, mercury-based compounds, formalin, white dust, bithionol, boric acid/borax, dichlorophen, hexachlorophen, halogenated salicylanilide and the like.

<Dosage form/form>

The dosage form of the cosmetic of the present invention is not particularly limited as long as the shape of the metal sulfate particles is maintained spherical, and can be appropriately selected according to the purpose of use. In order to maintain the spherical shape, it should not be dissolved in water. For example, the spherical shape can be maintained by dispersing it in powder or an oily component. From the viewpoint of preventing moisture absorption during storage and easily maintaining the spherical shape, it is preferable to disperse it in an oily component. A powder or a dispersion in an oily component may be in the form of powder, solid powder, oil, oily solid, cream, gel, oil-in-water emulsion, water-in-oil emulsion, or the like. can.
The form of the product is also not particularly limited, and may be powder type, compact type, stick type, cream type, emulsion type, gel, wax, roll-on type, aerosol type, non-aerosol type, and the like.

The cosmetic of the present invention can be manufactured by applying a manufacturing method using a conventional manufacturing apparatus such as a mixer and a press.
Specifically, pigments and other powders are stirred and mixed in a mixer, and if necessary, a binder that has been heated and dissolved in advance is added, and the mixture is sufficiently stirred until uniform. methods and the like can be applied.

EXAMPLES The present invention will be specifically described below with reference to examples, but the technical scope of the present invention is not limited by these examples.

[Evaluation of friction properties of aluminum sulfate particles]
First, a method for producing spherical aluminum sulfate particles will be described.
Aluminum potassium sulfate (TAIACE K20, median diameter 4 to 6 μm; manufactured by Taimei Chemical Co., Ltd.) was dissolved in water to prepare an 8 mass % aluminum potassium sulfate solution. Next, this solution was spray-dried using a spray-drying device (device name OC16; manufactured by Ogawara Kakoki Co., Ltd.) to obtain spherical particles of potassium aluminum sulfate.
The median diameter of the obtained particles was measured using a laser diffraction/scattering method (particle size distribution analyzer HELOS; manufactured by Nippon Laser Co., Ltd.). Table 1 shows the measurement results. In Examples 1 to 3 in Table 1, the obtained particles were sampled from three locations.
The obtained aluminum potassium sulfate particles are shown in FIG. Furthermore, FIG. 5 shows hollow aluminum potassium sulfate particles.
It can be seen from FIG. 4 that spherical aluminum potassium sulfate particles are obtained. Furthermore, it can be seen from FIG. 5 that spherical and hollow aluminum potassium sulfate particles can also be obtained.

Next, the obtained spherical aluminum potassium sulfate particles were evaluated for average coefficient of friction (MIU) using a friction tester (KES-SE; manufactured by Kato Tech Co., Ltd.). As a comparative example, non-spherical potassium aluminum sulfate particles (Thai Ace K20, Fig. 6) were also evaluated in the same manner.

An evaluation method will be described with reference to FIG.
First, a double-sided tape 210 (Nicetack NW-15; manufactured by Nichiban Co., Ltd.) is attached to a slide glass 220 washed with ethanol, and aluminum potassium sulfate particles 240 are applied to the opposite adhesive surface with a knife 200 to coat the adhesive surface of the tape. is applied so as not to appear on the surface, and the measurement kit 300 is produced. After that, the measuring kit 300 was set in the friction tester 500 and moved by the moving stage 240, and the average coefficient of friction (MIU) was measured by the sensor 250. FIG. The measurement was performed under conditions of a temperature of 24°C and a humidity of 31%. Table 1 shows the measurement results.

From the results in Table 1, it was found that the spherical potassium aluminum sulfate particles used in Examples had a smaller average coefficient of friction than the non-spherical potassium aluminum sulfate particles used in Comparative Examples. This means that it glides well when applied to the skin, allowing the particles to sufficiently approach the sulcus cutis and pores. In addition, it is possible to impart a smooth feel to the skin since it has good slipperiness when applied.

[Prescription example]
Next, examples of formulations in which the spherical aluminum sulfate particles of the present invention are applied to antiperspirants, body powders, face powders, foundations, and cheeks are shown. However, the technical scope of the present invention is not limited by these prescription examples.

(Prescription example 1)
An antiperspirant (stick type) was prepared according to the following formulation.
Ingredient name Amount (% by mass)
Spherical aluminum potassium sulfate particles 15.00
Benzalkonium chloride 0.10
Silver-containing zeolite 5.00
Isopropylmethylphenol 0.10
Cyclopentasiloxane 19.35
Dimethicone 2.00
Stearyl alcohol 25.00
POP-butyl ether-1 20.00
Boron nitride 3.00
Sorbitan sesquiisostearate 2.50
Microcrystalline wax 3.00
Menthol 0.30
Diisostearyl malate 1.00
Glyceryl diisostearate 2.50
Butyl hydroxytoluene 0.05
Aluminum hydroxide 0.10
Titanium oxide 1.00

(Prescription example 2)
An antiperspirant (stick type) was prepared according to the following formulation.
Ingredient name Amount (% by mass)
Spherical aluminum potassium sulfate particles 22.00
Isopropyl palmitate 15.00
Hydrogenated castor oil 3.00
Cyclopentasiloxane 20.00
Polydecene 18.00
PEG-8 distearate 1.50
Stearyl alcohol 17.00
Perfume 0.50
PPG-14 butyl ether balance

(Prescription example 3)
An antiperspirant (aerosol type) was prepared according to the following formulation.
Ingredient name Amount (% by mass)
Spherical aluminum potassium sulfate particles 2.50
Stearalkonium bentonite 0.50
Isopropyl palmitate 2.50
Perfume 0.50
Isobutane 85.00
Cyclopentasiloxane 0.50
Triethyl citrate 1.00
cyclopentasiloxane balance

(Prescription example 4)
An antiperspirant (stick type) was prepared according to the following formulation.
Ingredient name Amount (% by mass)
Spherical aluminum potassium sulfate particles 16.00
Isopropylmethylphenol 0.10
Cyclopentasiloxane 27.45
Dimethicone 2.00
Stearyl alcohol 20.00
POP-butyl ether-1 20.00
Bismuth oxychloride 2.00
Plate-like alumina 1.00
Sorbitan sesquiisostearate 2.50
Hydrogenated castor oil 2.00
Microcrystalline wax 2.00
Menthol 0.30
Diisostearyl malate 1.00
Glyceryl diisostearate 2.50
Butyl hydroxytoluene 0.05
Aluminum hydroxide 0.10
Titanium oxide 1.00

(Prescription example 5)
A face powder was prepared according to the following recipe.
Ingredient name Amount (% by mass)
Talc Balance Spherical aluminum potassium sulfate particles 22.00
Polyurethane 8.00
Silicic anhydride 0.50
Titanium oxide 1.00
Red iron oxide Appropriate amount Yellow iron oxide Appropriate amount Black iron oxide Appropriate amount Titanium mica 2.00

(Prescription example 6)
A body powder was prepared according to the following recipe.
Ingredient name Amount (% by mass)
Talc Balance Spherical aluminum potassium sulfate particles 15.00
Magnesium stearate Appropriate amount Perfume Appropriate amount

(Prescription example 7)
A foundation (compact type) was prepared according to the following formulation.
Ingredient name Amount (% by mass)
Spherical aluminum potassium sulfate particles 3.00
Talc 43.20
Sericite 22.00
Titanium dioxide 12.00
Silica 5.00
Phenoxyethanol 0.80
Mineral oil 5.00
Dimethyl silicone 5.00
Sorbitan sesquiisostearate 2.00
Yellow iron oxide 1.50
Red iron oxide 0.30
Black iron oxide 0.20

(Prescription example 8)
A blush was prepared according to the following recipe.
Ingredient name Amount (% by mass)
Talc Balance Spherical aluminum potassium sulfate particles 15.0
Sericite 20.0
Magnesium Stearate 3.0
Mica Titanium 10.0
Colorant Appropriate amount Cetyl ethylhexanoate 1.0
Ethylhexyl palmitate 3.0
Dimethicone 3.0

Since the spherical metal sulfate particles of the present invention have a spherical shape, they slide well when applied to the skin, allowing the particles to sufficiently approach the sulcus cutis and pores.
The metal sulfate particles of the present invention can also be used in cosmetics such as antiperspirants, body powders, face powders, foundations, makeup bases, and cheeks.

10 pores, 20 cutaneous grooves, 30 cuticles, 100 spherical particles, 200 coating knife, 210 double-sided tape, 220 slide glass, 240 aluminum potassium sulfate particles, 240 moving stage, 250 sensor 300 measurement kit, 500 friction tester

Claims (5)

Particles of a metal sulfate that is a sulfate of a trivalent metal salt,
A cosmetic containing metal sulfate particles, wherein the particles are spherical and have a median diameter of 200 µm or less. 2. The cosmetic containing metal sulfate particles according to claim 1, wherein said metal sulfate particles are hollow. 3. The cosmetic containing metal sulfate particles according to claim 1, wherein said metal sulfate is a hydrate. 3. The cosmetic containing metal sulfate particles according to claim 1, wherein said metal sulfate is an anhydride. The metal sulfate particle-containing cosmetic according to any one of claims 1 to 4, wherein the metal sulfate particle-containing cosmetic is an antiperspirant, body powder, face powder, foundation, makeup base, or blush.

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