Stick-type antiperspirant containing burnt alum particles

Abstract

To provide a stick type antiperspirant that can ensure the same use feeling regardless of which portion is used from beginning to end.SOLUTION: The problem is solved by a stick type antiperspirant containing burnt alum particles. The burnt alum particles have a volume average diameter of 3.95 μm or less in particle size distribution.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a stick-type antiperspirant containing calcined alum particles, and more particularly to a stick-type antiperspirant containing calcined alum particles that satisfy a specific particle size distribution. [Background technology]

[0002] Antiperspirants are known as products that can prevent body odor and reduce stickiness of the skin by suppressing sweating. Antiperspirants are sold in various dosage forms, such as lotions, aerosols, sticks, powders, roll-ons, creams, and emulsions. Among these, stick-type antiperspirants are known to be a dosage form that allows the antiperspirant ingredients to be applied directly to the skin and is therefore more effective at suppressing perspiration. For example, Patent Document 1 proposes a stick-type antiperspirant containing an antiperspirant component and a specific amide compound. Furthermore, Patent Document 2 describes that burnt alum particles are widely used as an antiperspirant ingredient for suppressing sweating and unpleasant odors from the armpits. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-63164 [Patent Document 2] Japanese Patent Application Publication No. 4-103519 Summary of the Invention [Problem to be solved by the invention]

[0004] As mentioned above, stick-type antiperspirants are applied directly to the skin, and when used, they are required to provide the same sensation of use from the beginning to the end, regardless of which part of the body is used. Therefore, an object of the present invention is to provide a stick-type antiperspirant that can provide the same sensation of use from the beginning to the end of use, regardless of which part is used. [Means for solving the problem]

[0005] The present inventors have conducted extensive research into the above-mentioned problems and have discovered that the poor feel when using a stick-type antiperspirant is caused by non-uniform hardness in the stick-type antiperspirant. They have also discovered that the non-uniform hardness in a stick-type antiperspirant is caused by the fact that when the active ingredient, calcined alum particles, are filled, the particles settle and a concentration gradient remains while the stick is cooled and solidified. Therefore, the inventors discovered that by using calcined alum particles having a volume average diameter of 3.95 μm or less in a stick-type antiperspirant, it is possible to prevent the powder raw material from settling during formulation, causing a concentration gradient to occur when the powder is cooled and solidified, resulting in non-uniform distribution of the active ingredient; in other words, it is possible to prevent uneven distribution of the calcined alum particles and make the hardness of the stick-type antiperspirant uniform, thereby completing the present invention. That is, the present invention relates to the following stick-type antiperspirant.

[0006] The stick-type antiperspirant of the present invention is a stick-type antiperspirant containing calcined alum particles, characterized in that the calcined alum particles have a volume average diameter of 3.95 μm or less. According to this feature, by incorporating calcined alum having a volume average diameter of 3.95 μm or less, uneven distribution of calcined alum particles in the stick portion can be suppressed, and the hardness of the stick-type antiperspirant can be made uniform, so that the stick-type antiperspirant can provide the same feeling of use regardless of which part is used, from the beginning to the end of use. Furthermore, since the hardness of the stick-type antiperspirant can be made uniform, it is possible to prevent the force from concentrating on one part of the stick, and to make the stick-type antiperspirant less likely to break. Furthermore, the burnt alum particles are extremely fine particles with a volume average diameter of 3.95 μm or less, which increases their solubility in moisture such as sweat, resulting in a more immediate antiperspirant effect.

[0007] Furthermore, in one embodiment of the stick-type antiperspirant of the present invention, the particle size distribution of the burnt alum particles satisfies the following (a): The stick-type antiperspirant according to claim 1. (a) Cumulative 90% particle size (D90) is 8.0 μm or less According to this feature, the use of burnt alum particles with a fine particle size overall can increase the solubility in moisture such as sweat, thereby achieving a more immediate antiperspirant effect, thereby more efficiently neutralizing basic substances such as ammonia contained in sweat that has accumulated in pores and skin grooves.

[0008] Furthermore, in one embodiment of the stick-type antiperspirant of the present invention, the particle size distribution of the burnt alum particles is characterized in that the difference between (a) the cumulative 90% particle size (D90) and (b) the cumulative 10% particle size (D10) is 7.50 μm or less. According to this feature, the particle size distribution of the calcined alum particles can be made to be close to a normal distribution, and uneven distribution of the calcined alum particles in the stick-type antiperspirant can be further suppressed.

[0009] Furthermore, one embodiment of the stick-type antiperspirant of the present invention is characterized in that the content of burnt alum particles is 0.1% by mass or more. This feature allows the stick-type antiperspirant to exert its antiperspirant effect more efficiently. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a stick-type antiperspirant that can provide the same sensation of use from the beginning to the end of use, regardless of which part is used. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a graph showing the particle size distribution of burnt alum particles obtained by fine pulverization. DETAILED DESCRIPTION OF THE INVENTION

[0012] Next, the present invention will be described, including the best mode for carrying out the invention. [Stick-type antiperspirant] The stick-type antiperspirant of the present invention is a stick-type antiperspirant containing calcined alum particles, characterized in that the calcined alum particles have a volume average diameter of 3.95 μm or less.

[0013] <Cast alum particles> The calcined alum particles contained in the stick-type antiperspirant of the present invention are obtained by heating alum hydrate to remove the water of hydration. Hydrate is a general term for substances containing water, and depending on the number of waters of hydration, there are hydrates such as monohydrate, dihydrate, etc. For example, alum hydrates are known as octahydrate and dodecahydrate, and the term alum generally refers to hydrates. The calcined alum particles contained in the stick-type antiperspirant of the present invention are in a state in which the water has been removed from alum containing water of crystallization or water of hydration, and therefore have low solubility in water, etc., and can prevent deliquescence, thereby allowing the stick-type antiperspirant to maintain stable quality against humidity, etc.

[0014] The calcined alum contained in the stick-type antiperspirant of the present invention is a double salt consisting of a sulfate of a monovalent cation and a trivalent metal ion. Examples of the monovalent cation include ammonium ion, sodium ion, and potassium ion, and examples of the trivalent metal ion include aluminum ion and iron ion.

[0015] The burnt alum used in the present invention includes, for example, aluminum salts, specifically ammonium aluminum sulfate (ammonium alum), sodium aluminum sulfate (sodium alum), and potassium aluminum sulfate (potassium alum), and preferably sodium aluminum sulfate and potassium aluminum sulfate.

[0016] The alum particles contained in the stick-type antiperspirant of the present invention are characterized by a volume-average diameter of 3.95 μm or less. The upper limit of the volume-average diameter of the burnt alum particles is preferably 3.70 μm or less, more preferably 3.60 μm or less. The lower limit is preferably 1.70 μm or more, more preferably 2.50 μm or more, and even more preferably 3.00 μm or more. The stick-type antiperspirant of the present invention contains calcined alum particles having a volume average diameter of 3.95 μm or less, which prevents uneven distribution of the calcined alum particles in the stick portion and makes the hardness of the stick-type antiperspirant uniform, thereby enabling the stick-type antiperspirant to provide the same sensation of use regardless of which part is used from the beginning to the end of use. Here, the volume mean diameter refers to the VMD (Volume Mean Diameter) measured by a laser diffraction particle size analyzer using a particle size distribution measuring device (measuring instrument body: HELOS / R, dispersion unit: RODOS / L) and software: WINDOX5, with particles dispersed by dry air current dispersion at a dispersion pressure of 5.0 BAR. VMD is a value expressed by the following formula, and is a volume-weighted mean diameter.

[0017]

number

[0018] Furthermore, in the stick-type antiperspirant of the present invention, the particle size distribution of the burnt alum particles preferably satisfies the following (a) to (c): (a) Cumulative 90% particle size (D90) is 8.00 μm or less (b) Cumulative 10% particle size (D10) is 1.00 μm or less (c) Cumulative 50% particle size (D50) is 3.50 μm or less The D10, D50, and D90 are particle sizes at which the cumulative volume from the small particle size side of the cumulative particle size distribution on a volume basis is 10%, 50%, and 90%, respectively. When the calcined alum particles satisfy the above (a) to (c), the particle size distribution is closer to a normal distribution, which makes it possible to further suppress uneven distribution of the calcined alum particles when the particles are made into a stick-type antiperspirant. Furthermore, since the particle size of the burnt alum particles is generally small, it is possible to increase the solubility in moisture such as sweat, thereby achieving a more immediate antiperspirant effect, thereby more efficiently neutralizing basic substances such as ammonia contained in sweat that has accumulated in pores and skin grooves.

[0019] The D90 in the particle size distribution of the burnt alum particles is preferably 8.00 μm or less. The upper limit of D90 for the burnt alum particles is preferably 7.80 μm or less, more preferably 7.50 μm or less. The lower limit is preferably 3.00 μm or more, more preferably 4.00 μm or more, and even more preferably 5.00 μm or more. In the stick-type antiperspirant of the present invention, by making the D90 of the calcined alum particles 8.00 μm or less, it is possible to increase the solubility in moisture such as sweat, and to obtain a more immediate antiperspirant effect.

[0020] The D10 in the particle size distribution of the burnt alum particles is preferably 1.00 μm or less. The upper limit of D10 in the particle size distribution of the burnt alum particles is more preferably 0.90 μm or less, even more preferably 0.80 μm or less, and particularly preferably 0.70 μm or less. The lower limit is not particularly limited, but is preferably 0.10 μm or more, more preferably 0.30 μm or more, and even more preferably 0.50 μm or more.

[0021] The D50 in the particle size distribution of the burnt alum particles is preferably 3.50 μm or less. The upper limit of D50 in the particle size distribution of the burnt alum particles is more preferably 3.30 μm or less, and even more preferably 3.10 μm or less. The lower limit is preferably 1.00 μm or more, more preferably 1.50 μm or more, and even more preferably 2.00 μm or more.

[0022] The (d) cumulative 99% particle size (D99) in the particle size distribution of the burnt alum particles is preferably 12.0 μm or less. The upper limit of D99 in the particle size distribution of the burnt alum particles is preferably 10.00 μm or less, and more preferably 8.10 μm or less. Here, D99 is the particle size at which the cumulative volume from the small particle size side of the cumulative particle size distribution on a volume basis becomes 99%.

[0023] Furthermore, in the stick-type antiperspirant of the present invention, the difference between (a) the cumulative 90% particle size (D90) and (b) the cumulative 10% particle size (D10) of the calcined alum particles (the value obtained by subtracting the particle size of D10 from the particle size of D90) is preferably 7.50 μm or less. The upper limit of D90-D10 in the particle size distribution of the calcined alum particles is preferably 7.00 μm or less, more preferably 6.50 or less. The lower limit is not particularly limited. In the stick-type antiperspirant of the present invention, by setting the difference between D90 and D10 of the calcined alum particles to 7.50 μm or less, the particle size distribution of the calcined alum particles can be made to be close to a normal distribution, and uneven distribution of the calcined alum particles in the stick-type antiperspirant can be suppressed.

[0024] The particle size distribution in the present invention is a value measured using a laser diffraction / scattering method (particle size distribution measuring device: measuring instrument body: HELOS / R, dispersion unit: RODOS / L, software: WINDOX5, particles dispersed by dry air current dispersion at a dispersion pressure of 5.0 BAR, measured with a laser diffraction particle size distribution analyzer).

[0025] <Method for producing burnt alum particles> The calcined alum particles contained in the stick-type antiperspirant of the present invention can be produced by mechanically pulverizing and further pulverizing large calcined alum particles. Examples of pulverizers capable of mechanically pulverizing and pulverizing include screen-type (screen mill), rotating disk-type, and axial flow-type fine pulverizers, and are preferably ball mills, rod mills, or jet mills, and more preferably jet mills. Examples of the jet mill include a jet mill device manufactured by Seishin Enterprise Co., Ltd.

[0026] Furthermore, in producing the calcined alum particles contained in the stick-type antiperspirant of the present invention, if it is desired to control the particle size distribution, the amount of calcined alum particles having a large particle size to be fed into the apparatus may be controlled. For example, when processing for one hour, the particle size distribution can be controlled by adding 10 kg or 80 kg. In the case of adding 10 kg, calcined alum particles with a smaller particle size distribution can be obtained, and in the case of adding 80 kg, calcined alum particles with a larger particle size distribution can be obtained compared to the case of adding 10 kg.

[0027] In the stick-type antiperspirant of the present invention, the content of calcined alum particles is not particularly limited, but is preferably 0.1% by mass or more. The lower limit is more preferably 1.0% by mass or more, even more preferably 2.0% by mass or more, and particularly preferably 5.0% by mass or more. The upper limit of the content of calcined alum particles is not particularly limited, but may be within a range that allows use in a stick-type antiperspirant. By setting the content of the burnt alum particles to 0.1% by mass or more, the antiperspirant effect can be more effectively exerted.

[0028] <Oil-based raw materials> In order to maintain its formulation and improve usability (ease of application, etc.), the stick-type antiperspirant of the present invention preferably contains an oily ingredient that is solid at room temperature and an oily ingredient that is liquid at room temperature. The melting point of the oily ingredient is preferably 40°C or higher, more preferably 50°C or higher, when the oily ingredient that is solid at room temperature and the oily ingredient that is liquid at room temperature are mixed together. The oily raw material is preferably one that can be heated and melted during production and that can maintain its shape when made into a stick-type antiperspirant. Specifically, it is preferable that the resin does not melt at around room temperature but melts at the molding temperature. The melting point of the oil-based raw material is preferably 60°C or higher.

[0029] Examples of oily raw materials include fats and oils, waxes, hydrocarbons, higher fatty acids, higher alcohols, esters, and silicone oils. More specifically, examples of fats and oils include olive oil, camellia oil, macadamia nut oil, and castor oil; examples of waxes include carnauba wax, candelilla wax, jojoba oil, beeswax, and lanolin; examples of hydrocarbons include liquid paraffin, paraffin, petrolatum, ceresin, microcrystalline wax, and squalane; examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, and isostearic acid; examples of higher alcohols include cetyl alcohol, stearyl alcohol, isostearyl alcohol, and 2-octyldodecanol; examples of esters include isopropyl myristate, 2-octyldodecyl myristate, cetyl 2-ethylhexanoate, and diisostearyl malate; and examples of silicone oils include methylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, highly polymerized methylpolysiloxane, and dextrin palmitate.

[0030] <Other compounds> The stick-type antiperspirant of the present invention may contain other ingredients commonly used in cosmetics, such as inorganic pigments, polymer powders, surfactants, moisturizers, thickeners, polymers, UV protection agents, antioxidants, antioxidant aids, sequestering agents, metallic soaps such as magnesium stearate, whitening agents, anti-wrinkle agents, skin roughness alleviating agents, anti-acne agents, deodorants, cooling agents, astringents, antibacterial agents, organic pigments, natural colorings, fragrances, vitamins, and emollients. When the other ingredients are particles, there are no restrictions on the particle size, but in order to reduce uneven distribution of the calcined alum particles in a stick-type antiperspirant, it is preferable that the particle size be approximately the same as that of the calcined alum particles.

[0031] Examples of inorganic pigments include extender pigments, color pigments, and white pigments. The inclusion of an extender pigment makes it possible to adjust the spreadability, adhesion, gloss, etc. of the stick-type antiperspirant. Specific examples include mica, sericite, talc, kaolin, synthetic phlogopite, calcium carbonate, magnesium carbonate, silicic anhydride, aluminum oxide, barium sulfate, and hydroxyapatite. The color pigment is used to adjust the color tone of the stick-type antiperspirant, and specific examples thereof include red iron oxide, yellow iron oxide, black iron oxide, chromium oxide, ultramarine, Prussian blue, and carbon black. The white pigment not only adjusts the color tone of the stick-type antiperspirant but also adjusts the hiding power, and specific examples thereof include titanium dioxide, zinc oxide, bismuth oxychloride, and boron nitride.

[0032] Specific examples of polymer powders include polyethylene powder, polymethyl methacrylate, polyethylene terephthalate-polymethyl methacrylate laminate powder, nylon powder, polyurethane powder, and silicone powder.

[0033] Examples of surfactants include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants. More specifically, examples of anionic surfactants include higher fatty acid soaps, alkyl sulfates, polyoxyalkyl ether sulfates, acyl N-methyl taurine salts, alkyl ether phosphates, N-acyl amino acid salts, and sodium POE lauryl ether phosphate. Examples of cationic surfactants include dimethylstearylammonium hectorite, alkyltrimethylammonium chloride, dialkyldimethylammonium chloride, and benzalkonium chloride. Examples of amphoteric surfactants include alkyldimethylaminoacetic acid betaine, alkylamidopropyldimethylaminoacetic acid betaine, and 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine. Examples of nonionic surfactants include polyoxyethylene surfactants, polyhydric alcohol esters, ethylene oxide / propylene oxide block copolymers, hydrogenated castor oil, sorbitan sesquiisostearate, octyl palmitate, and glyceryl trioctanoate.

[0034] Examples of moisturizing agents include glycerin, propylene glycol, dipropylene glycol, 1,3-butylene glycol, polyethylene glycol, sorbitol, sodium lactate, sodium 2-pyrrolidone-5-carboxylate, and sodium hyaluronate.

[0035] Examples of thickeners include polyoxypropylene butyl ether, quince seed gum, xanthan gum, sodium carboxymethylcellulose, and carboxyvinyl polymer.

[0036] Examples of polymers include alkyl polyacrylate, polyvinyl alcohol, polyvinylpyrrolidone, nitrocellulose, and polymeric silicone.

[0037] Examples of ultraviolet protection agents include ultraviolet absorbers such as benzophenone derivatives, para-aminobenzoic acid derivatives, methoxycinnamic acid derivatives, and salicylic acid derivatives, and ultraviolet scattering agents such as fine particle titanium oxide, fine particle zinc oxide, and fine particle iron oxide.

[0038] Examples of antioxidants include tocopherols including vitamin E, BHT, gallic acid esters, thiotaurine, hypotaurine, etc. Examples of antioxidant aids include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, ethylenediaminetetraacetic acid (EDTA), etc.

[0039] Examples of sequestering agents include sodium ethylenediaminetetraacetate, phosphoric acid, citric acid, ascorbic acid, succinic acid, gluconic acid, sodium polyphosphate, and sodium metaphosphate.

[0040] Examples of whitening agents include vitamin C, arbutin, kojic acid, ellagic acid, and rucinol.

[0041] Anti-wrinkle agents include, for example, retinoids (vitamins A), α-hydroxy acids, and the like.

[0042] Examples of the skin roughness improving agent include anti-inflammatory agents such as β-glycyrrhetinic acid, glycyrrhizinic acid derivatives (VII), allantoin, azulene, and hydrocortisone (VIII), and protease inhibitors.

[0043] Examples of anti-acne medications include sebum-suppressing ingredients such as estradiol, estrone, ethinylestradiol, and vitamin B6; keratin-exfoliating and dissolving ingredients such as sulfur, salicylic acid (X), and resorcinol (XI); bactericidal ingredients such as benzalkonium chloride, benzethonium chloride, halocarban, and 2,4,4-trichloro-2-hydroxyphenol; and anti-inflammatory ingredients such as glycyrrhizin and glycyrrhetinic acid.

[0044] Examples of deodorizing agents include aluminum chlorohydrate, aluminum chloride, allantoin chlorohydroxyaluminum, zinc oxide, zinc paraphenolsulfonate, silver-containing zeolite, antiperspirant ingredients other than the above-mentioned burnt alum, bactericidal ingredients such as benzalkonium chloride, benzethonium chloride, halocarban, and chlorhexidine hydrochloride, and deodorizing ingredients such as polyphenol-based persimmon tannin and tea catechin.

[0045] Examples of the cooling agent include menthol (XII), camphor, menthyl glyceryl ether, and menthyl lactate.

[0046] Examples of astringents include zinc oxide, zinc sulfate, allantoin hydroxyaluminum, aluminum chloride, zinc sulfophenolate, tannic acid, citric acid, and lactic acid.

[0047] Antibacterial agents include benzoic acid and its salts, salicylic acid and its salts, phenol, sorbic acid and its salts, dehydroacetic acid and its salts, paraben, chlorcresol, hexachlorophene, resorcinol, isopropylmethylphenol, orthophenylphenol, benzalkonium chloride, chlorhexidine hydrochloride, chlorhexidine gluconate, alkylisoquinolinium bromide, trichlorocarbanilide, halocarban, photosensitizer No. 201, phenoxyethanol, triclosan, methylchloroisothiazolinone / methylisothiazolinone solution, bisabolol, alkyldiaminoethylglycine hydrochloride, trichlorosalicylanilide, tribromosalicylanilide, mercury compounds, formalin, white lime, bithionol, boric acid / borax, dichlorophen, hexachlorophene, and halogenated salicylanilides.

[0048] The stick-type antiperspirant of the present invention is preferably an antiperspirant having a stick-like shape such as a plate having a square, rectangular, trapezoidal, circular or elliptical shape, a rod-like shape such as a cylindrical, triangular prism, quadrangular prism, pentagonal prism or hexagonal prism, or a sphere. The length of the stick-type antiperspirant is preferably 1 to 10 cm, and the diameter is preferably 1 to 5 cm. It is used by applying it directly to the skin of the armpits, arms, forehead, neck, chest, back, feet, fingers, etc. to exert its antiperspirant effect. Furthermore, the stick-type antiperspirant of the present invention can be used more effectively by applying it directly to the skin after wiping away sweat. It is preferable to apply about 0.1 to 2 g, and particularly 0.1 to 1 g, to each target area of ​​the skin per day.

[0049] <Hardness of stick-type antiperspirants> In the stick-type antiperspirant of the present invention, the difference in hardness between the upper part and the lower part (difference in average load) is preferably 120 g or less, more preferably 100 g or less, and even more preferably 80 g or less. For example, the hardness is measured at the radial points in the direction of the center of a stick-type antiperspirant that is 4 cm long and 25 mm in diameter, at a point 7 mm from the top and a point 23 mm from the top in the length direction. For example, the hardness is determined by the load value obtained when measuring using a Texture Analyzer TA.XT plus (manufactured by stable Micro Systems) under the following measurement conditions: a jig P / 2 (a cylindrical probe with a diameter of 2 mm), a compression speed of 1 mm / sec, a compression distance of 10 mm, a trigger load of 5 g, and a load cell of 5 kg.

[0050] <Manufacturing method for stick-type antiperspirant> The method for producing the stick-type antiperspirant of the present invention is not particularly limited as long as it is a method that can mold the burnt alum particles of the present invention into a stick shape. Examples of the method include a method in which a liquid raw material is cooled and solidified in a mold, and a method in which solidified and pulverized raw material is filled in a mold and subjected to compression molding.

[0051] The method of producing the resin by cooling and solidifying a liquid raw material in a mold can be, for example, the following steps. (a-1) A step of preparing burnt alum particles having a volume average diameter of 3.95 μm or less, or a mixture of burnt alum particles having a volume average diameter of 3.95 μm or less and other compounds. (a-2) A step of adding the burnt alum particles prepared in (a-1) to the oily raw material that has been heated to a liquid state and stirring and mixing the mixture. (a-3) A process of pouring the oily raw material kneaded with burnt alum particles into a molding container and solidifying it under cooling conditions.

[0052] In step (a-2), the oil-based raw material is as described above in the section <Oil-based raw material>, and the other compounds are as described above in the section <Other compounds>. Here, in (a-2), the heating temperature for turning the oily raw material into a liquid state is not particularly limited, but is preferably 80°C or higher, more preferably 90°C or higher. In (a-3), the cooling temperature is not particularly limited, but it is preferable to cool at a low temperature to prevent the settling of the burnt alum particles. The cooling temperature is preferably 40°C or lower, more preferably 30°C or lower, and even more preferably 20°C or lower. Furthermore, the cooling time is not particularly limited, but it is preferable to cool the material in as short a time as possible, since the sedimentation of the burnt alum particles can be suppressed by cooling the material more quickly. The cooling time can be appropriately set depending on the size of the stick, but is preferably 24 hours or less, more preferably 12 hours or less, and even more preferably 6 hours or less.

[0053] The method for producing the composition by compression molding can be carried out, for example, by the following steps. (b-1) A step of preparing burnt alum particles having a volume average diameter of 3.95 μm or less, or a mixture of burnt alum particles having a volume average diameter of 3.95 μm or less and other compounds. (b-2) A step of adding the burnt alum particles prepared in (b-1) to the oily raw material that has been heated to a liquid state and kneading the mixture. (b-3) A process of cooling and solidifying the oily raw material kneaded with burnt alum particles, etc. (b-4) A step of crushing the solidified burnt alum particles etc. using a crusher, filling a molding container, and molding it into a stick shape using a compression press.

[0054] Here, in (b-2), the heating temperature for turning the oily raw material into a liquid state is not particularly limited, but is preferably 80°C or higher, more preferably 90°C or higher. In (b-3), the cooling temperature is not particularly limited, but it is preferable to cool at a low temperature in order to prevent the calcined alum particles from settling. The temperature is preferably 40°C or lower, more preferably 30°C or lower, and even more preferably 20°C or lower. Furthermore, the cooling time is not particularly limited, but since more instantaneous cooling can suppress the settling of the burnt alum particles, it is preferable to cool in as short a time as possible. The cooling time is preferably 24 hours or less, more preferably 12 hours or less, and even more preferably 6 hours or less. [Example]

[0055] The present invention will be specifically described below with reference to examples, but the technical scope of the present invention is not limited to these examples.

[0056] <Production method of burnt alum particles (1)> 7 kg of burnt alum (potassium aluminum sulfate: "Thai Ace K20": manufactured by Taimei Chemical Industry Co., Ltd.) was added and finely pulverized for 1 hour using a jet mill (manufactured by Seishin Enterprise Co., Ltd., Model No. STJ-200). A graph showing the particle size distribution of the burnt alum particles obtained by finely pulverizing is shown in Figure 1. The particle size distribution of the burnt alum particles before finely pulverizing is also shown in Figure 1. Table 1 also shows the volume mean diameter (VMD), cumulative 50% particle diameter (D50), cumulative 10% particle diameter (D10), cumulative 90% particle diameter (D90), cumulative 99% particle diameter (D99), and D90-D10 of the burnt alum particles before and after fine grinding.

[0057] [Table 1]

[0058] <Production method of burnt alum particles (2)> Burnt alum (potassium aluminum sulfate: "Thai Ace K20": manufactured by Taimei Chemical Industry Co., Ltd.) was finely pulverized for 1 hour using a jet mill (manufactured by Seishin Enterprise Co., Ltd., Model STJ-200), and the particle size distribution for each input amount was confirmed. The particle size distribution for each input amount is shown in Table 2.

[0059] [Table 2]

[0060] <Manufacturing stick-type antiperspirants> In Example 1, a stick-type antiperspirant was produced using the burnt alum particles obtained by finely pulverizing the above-mentioned amount of 80 kg. The production method involved melting a high-melting-point material such as fat or oil at 90°C, adding calcined alum particles obtained by finely pulverizing the material, and mixing using a homomixer. After mixing, the mixture was filled into a container and cooled in a refrigerator at 5°C for 24 hours to produce a stick-type antiperspirant measuring 4 cm in length and 25 mm in diameter. In addition, as Comparative Example 1, a stick-type antiperspirant was produced using the calcined alum particles before finely pulverizing.

[0061] <Measurement of hardness of stick-type antiperspirant> The hardness of the stick-type antiperspirant produced above was measured at a section 7 mm from the top and a section 23 mm from the top using the following measuring equipment and under the following conditions (three samples). The results are shown in Table 3. The hardness of the stick-type antiperspirant here refers to the average value (average load) of the maximum load and the minimum load obtained in the above measurement. Measuring equipment: Texture Analyzer TA.XT plus (manufactured by stable Micro Systems) Measurement conditions: Jig P / 2 (2mm diameter cylindrical probe), compression speed 1mm / sec, compression distance 10mm, trigger load 5g, load cell used 5kg

[0062] [Table 3]

[0063] The results in Table 3 show that the stick-type antiperspirant using the calcined alum particles obtained by fine grinding has a smaller difference in hardness between the part 7 mm from the top and the part 23 mm from the top, compared to the stick-type antiperspirant using the calcined alum particles before fine grinding. This shows that the stick-type antiperspirant using the calcined alum particles obtained by fine grinding provides the same feeling of use regardless of which part is used, from the beginning to the end. Furthermore, the stick-type antiperspirant using the calcined alum particles obtained by finely pulverizing had a smaller measurement load than the stick-type antiperspirant using the calcined alum particles before finely pulverizing. This indicates that the stick-type antiperspirant is softer, and it was found that it can be used as an antiperspirant stick with a better feel when used.

[0064] Furthermore, burnt alum particles obtained by finely pulverizing input amounts of 7 kg, 10 kg, and 40 kg were used to prepare stick-type antiperspirants similar to those in Example 1. It was found that these also produced stick-type antiperspirants with small differences in hardness, similar to Example 1.

[0065] [Prescription example] Next, examples of formulations in which the calcined alum particles of the present invention are applied to stick-type antiperspirants will be shown, but the technical scope of the present invention is not limited to these formulation examples.

[0066] (Prescription Example 1) A stick-type antiperspirant was prepared according to the following formulation. Ingredient name Amount (mass%) Burnt alum 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 Butylhydroxytoluene 0.05 Aluminum hydroxide 0.10 Titanium dioxide 1.00

[0067] (Prescription example 2) A stick-type antiperspirant was prepared according to the following formulation. Ingredient name Amount (mass%) Burnt alum particles 18.50 Isopropyl palmitate 15.00 Hydrogenated Castor Oil 3.00 Cyclopentasiloxane 20.00 Polydecene 18.00 PEG-8 Distearate 1.50 Stearyl alcohol 17.00 Fragrance 0.50 PPG-14 butyl ether remainder

[0068] (Prescription Example 3) A stick-type antiperspirant was prepared according to the following formulation. Ingredient name Amount (mass%) Burnt alum 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 Butylhydroxytoluene 0.05 Aluminum hydroxide 0.10 Titanium dioxide 1.00

[0069] (Prescription Example 4) A stick-type antiperspirant was prepared according to the following formulation. Ingredient name Amount (mass%) Burnt alum particles (average volume diameter 1.81 μm) 7.50 Burnt alum particles (average volume diameter 4.64 μm) 7.50 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 Butylhydroxytoluene 0.05 Aluminum hydroxide 0.10 Titanium dioxide 1.00 [Industrial Applicability]

[0070] The stick-type product of the present invention contains calcined alum particles having a volume average diameter of 3.95 μm or less, and therefore has excellent antiperspirant effects and can be used as an antiperspirant without uneven distribution of the calcined alum particles.

Claims

1. A stick-type antiperspirant containing burnt alum particles and an oily ingredient having a melting point of 40°C or higher, The burnt alum particles have a volume average diameter of 3.95 μm or less, A stick-type antiperspirant, characterized in that the content of the burnt alum particles is 2.0% by mass or more.

2. 2. The stick-type antiperspirant according to claim 1, wherein the particle size distribution of the burnt alum particles satisfies the following (a): (a) Cumulative 90% particle size (D90) is 8.00 μm or less

3. The stick-type antiperspirant according to claim 1 or 2, further characterized in that the particle size distribution of the burnt alum particles is such that the difference between (a) the cumulative 90% particle size (D90) and (b) the cumulative 10% particle size (D10) is 7.50 μm or less.

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