JP7486287B2 - Deodorant powder composition - Google Patents

Description

The present invention relates to a deodorant powder composition that has improved spreadability on a surface.

In recent years, with the growing awareness of everyday odors and body odors, products aimed at deodorizing have been provided. Deodorizing products are usually provided in liquid or solid (stick) form. Furthermore, the ingredients blended into such deodorizing products are selected according to the deodorizing mechanism, and examples include antibacterial ingredients that act on bacteria that cause odor, antiperspirant ingredients that suppress sweat that causes odor, and deodorizing ingredients that absorb odors.

Specifically, known antibacterial ingredients include alum (Patent Document 1) and zinc undecylenate (Patent Document 2), while known antiperspirant ingredients include alum and aluminum hydroxychloride (Patent Document 3), and known deodorant ingredients include silica gel, alumina, titanium oxide, zinc oxide, and other metal oxides (Patent Document 4).

Furthermore, deodorant products often contain inorganic powders such as talc, silica, and aluminum oxide to prevent stickiness caused by sweat and other moisture and to provide a good feel when used (Patent Document 5).

JP 2014-097960 A JP 2007-289452 A International Publication No. 2015/146398 Japanese Patent Application Laid-Open No. 08-280781 JP 2015-003891 A

A wide variety of deodorizing products have been created, and the market for liquid or solid (stick) deodorizing products is saturated. On the other hand, awareness of the need for deodorization is increasing, and new deodorizing products are required to satisfy consumers. Therefore, the inventors focused on a powdered deodorizing composition in which the particles of the active ingredient themselves can be applied directly to the target, as a product form that can achieve a deodorizing effect more effectively.

Here, the powdered deodorant composition is used by spraying it on the surface to be deodorized, and in order to obtain an efficient deodorant effect, the powdered composition needs to spread (spread) over the entire surface to be sprayed and adhere uniformly to the surface when used. When the uniformity of adhesion and ease of spreading (ease of spreading) of the powdered deodorant composition on the surface to be sprayed were examined, the problem of uniformity of adhesion and ease of spreading were faced. This is thought to be because the property of powder particles that easily spread on a surface is essentially a slippery property, making it difficult for them to adhere to the surface, and conversely, the property of powder particles that allows them to adhere uniformly to a surface is essentially a non-slip property, making it difficult for them to spread on the surface.

The present invention aims to provide a deodorant composition that, while being in powder form, is both uniformly adhered to the surface to which it is applied and easy to spread (hereinafter, uniformly adhered and easy to spread are collectively referred to as "spreadability").

After extensive research, the inventors have found that by blending 10 to 45% by weight of silicon dioxide having an average particle size of 20 μm or less with talc and/or alum having an average particle size of 20 μm or less, it is possible to obtain a deodorant composition in powder form that is both uniformly adhered to the surface to be sprayed and easy to spread. The present invention was completed based on this finding and through further research. That is, the present invention provides the following aspects of the invention.

Item 1. A deodorant powder composition comprising (A) silicon dioxide, and (B) talc and/or (C) alum, wherein the average particle sizes of the components (A), (B) and (C) are 20 μm or less, and the component (A) is contained in an amount of 10 to 45% by weight.
Item 2. The deodorant powder composition according to Item 1, wherein the total amount of the product of the average particle size (μm) and the content (wt%) of the component (A) is 40 to 510.
Item 3. The deodorant powder composition according to Item 1 or 2, wherein the content of the component (A) per 1 part by weight of the total amount of the component (B) and the component (C) is 0.2 to 1.4 parts by weight.
Item 4. The deodorant powder composition according to any one of Items 1 to 3, wherein the total amount of the component (B) and the component (C) is 35 to 65% by weight.
Item 5. The deodorant powder composition according to any one of Items 1 to 4, further comprising (D) an aluminum chloro compound.
Item 6. The deodorizing powder composition according to any one of Items 1 to 5, which is used by being sprinkled inside footwear.

The present invention provides a powdered deodorant composition that is both uniformly applied to the surface and easy to spread, making it easy to use and providing an effective deodorant effect.

The deodorant powder composition of the present invention contains (A) silicon dioxide (hereinafter also referred to as "component (A)"), (B) talc (hereinafter also referred to as "component (B)") and/or (C) alum (hereinafter also referred to as "component (C)"), and is characterized in that the component (A), the component (B) and the component (C) have specific average particle sizes and the component (A) is contained in a specific amount. The deodorant powder composition of the present invention will be described in detail below.

(A) Silicon Dioxide The deodorant powder composition of the present invention contains silicon dioxide as component (A). Silicon dioxide is a known deodorant component in deodorant compositions, and is synonymous with silica and silicic anhydride.

The average particle size of component (A) used in the deodorant powder composition of the present invention is 20 μm or less from the viewpoint of effectively obtaining the dispersibility of the deodorant powder composition. From the viewpoint of obtaining even better dispersibility, the average particle size of component (A) is preferably 18.5 μm or less, more preferably 17 μm or less. There is no particular restriction on the lower limit of the average particle size of component (A), but from the viewpoint of obtaining a more preferable effect of improving the ease of spreading by combining with component (B), it is preferably 2 μm or more. In this specification, "average particle size" refers to the cumulative 50% particle size (D ₅₀ ) when measured using a laser diffraction scattering type particle size distribution measuring device.

As component (A), silicon dioxide having the same average particle size may be used alone, or two or more different types of silicon dioxide may be used in combination. In the deodorant powder composition of the present invention, the balance between the average particle size and content of silicon dioxide affects the dispersibility. Therefore, from the viewpoint of obtaining even better dispersibility, component (A) can be blended so that the total amount of the product of the average particle size (μm) and content (wt%) of component (A) is, for example, 40 to 510, preferably 45 to 300, more preferably 46 to 250, even more preferably 47 to 200, and even more preferably 48 to 190.

In addition, due to the characteristic of the powder form of the deodorant powder composition of the present invention, it is more preferable that the deodorant powder composition of the present invention has excellent handleability by suppressing the risk of contamination of hands and parts other than the target of spraying due to scattering of the powder composition when sprayed. Such handleability is also influenced by the balance between the average particle size and content of silicon dioxide. From the viewpoint of obtaining excellent handleability, the total amount of the product of the average particle size (μm) and the content (wt%) of component (A) is further 70 or more, preferably 80 or more, more preferably 90 or more, even more preferably 130 or more, and even more preferably 170 or more.

The content of component (A) in the deodorant powder composition of the present invention is 10 to 45% by weight from the viewpoint of obtaining effective dispersibility. From the viewpoint of obtaining even better dispersibility, preferred examples of the content of component (A) include 15 to 45% by weight, more preferably 15 to 25% by weight, and even more preferably 18 to 23% by weight.

In the deodorant composition of the present invention, the ratio of the content of component (A) to the total amount of components (B) and (C) is not particularly limited and is determined by the content of each component. From the viewpoint of obtaining even better dispersibility, the content of component (A) per part by weight of the total amount of components (B) and (C) is 0.2 to 1.4 parts by weight, preferably 0.25 to 1.35 parts by weight, and more preferably 0.3 to 1.3 parts by weight.

(B) Talc The deodorant powder composition of the present invention may contain talc as component (B). Talc is a known component used as a bulking agent in powder compositions, and is synonymous with talc. Talc itself has good adhesion uniformity, but poor spreading (difficult to spread). However, in the deodorant powder composition of the present invention, the ease of spreading of component (B) can be improved by combining component ( B ) with component (A).

Specifically, talc is a mineral composed of magnesium hydroxide and silicate, more specifically, hydrous magnesium silicate (Mg ₃ Si ₄ O ₁₀ (OH) ₂ ).

The average particle size of the (B) component used in the deodorant powder composition of the present invention is 20 μm or less from the viewpoint of effectively obtaining the dispersibility of the deodorant powder composition. From the viewpoint of obtaining even better dispersibility, the average particle size of the (B) component is preferably 18.5 μm or less, more preferably 17 μm or less, and even more preferably 16.5 μm or less. There is no particular restriction on the lower limit of the average particle size of the (B) component, but from the viewpoint of obtaining a more preferable effect of improving the ease of spreading by combining with the (A) component, it is preferably 10 μm or more, more preferably 14 μm or more, and even more preferably 16 μm or more.

The content of component (B) in the deodorant powder composition of the present invention is not particularly limited, but from the viewpoint of obtaining even better dispersibility, for example, 25 to 60% by weight, preferably 25 to 50% by weight, can be mentioned. Furthermore, from the viewpoint of obtaining even better dispersibility, the content of component (B) in the deodorant powder composition of the present invention is preferably an amount such that the total amount of components (B) and (C) is preferably 35 to 65% by weight, more preferably 40 to 60% by weight, and even more preferably 50 to 60% by weight.

(C) Alum The deodorant powder composition of the present invention may contain alum as component (C). Alum itself has good uniformity of application, but poor spreading (difficult to spread). However, in the deodorant powder composition of the present invention, by combining component (C) with component (A), the ease of spreading of component ( C ) can be improved.

Specifically, alum is a sulfate double salt of a trivalent metal ion (R III ) and a monovalent metal ion or ammonium ion (R ^I ), represented by the general formula R ^III R ^I (SO ₄ ) _{2.mH 2} O, or _R ^I [R ^III (H ₂ O) ₆ ] (SO ₄ ) 2.mH ₂ O, where m is 12, 10, 6, 4, 3, 2, or 0. Examples of the trivalent metal (R ^III ) include Al, Fe, and Cr, ^and examples of the monovalent metal ion or ammonium ion (R ^I ) include K, Na, and NH ₄ . Preferable examples of alum include potassium alum represented by AlK( _SO4 ) _2.mH2O (m is 12, 10 _{, 6} , 3, or 2) and burnt potassium alum (m is 0), as well as ammonium alum represented by _AlNH4 ( _SO4 ) _2.nH2O (m is 12, 10, 6, 4, 3, or 2) and burnt ammonium alum (m is 0). Of these, potassium alum and burnt potassium alum are preferred, and burnt potassium alum is more preferred.

The average particle size of the (C) component used in the deodorant powder composition of the present invention is 20 μm or less from the viewpoint of effectively obtaining the dispersibility of the deodorant powder composition. From the viewpoint of obtaining even better dispersibility, the average particle size of the (C) component is preferably 18.5 μm or less, more preferably 17 μm or less. There is no particular restriction on the lower limit of the average particle size of the (C) component, but from the viewpoint of obtaining a more preferable effect of improving the ease of spreading by combining with the (A) component, the average particle size is preferably 10 μm or more, more preferably 14 μm or more, and even more preferably 16 μm or more.

The content of component (C) in the deodorant powder composition of the present invention is not particularly limited, and can be appropriately determined depending on the dispersibility and the antibacterial and/or antiperspirant effects to be exerted. From the viewpoint of obtaining these effects better, a preferred example of the content of component (C) is 5% by weight or more. There is no particular limit to the upper limit of the content of component (C), but from the viewpoint of reducing irritation to the skin caused by alum itself, it is preferably less than 20% by weight, more preferably 15% by weight or less, even more preferably 12% by weight or less, and even more preferably 10% by weight or less.

(D) Aluminum Chloro Compound The deodorant powder composition of the present invention may contain an aluminum chloro compound as component (D). The aluminum chloro compound is a compound known as an antiperspirant component. The aluminum chloro compound also exhibits antibacterial properties. The aluminum chloro compound itself is excellent in ease of spreading, but when combined with component (B) and/or component (C), the spreading property is extremely deteriorated. However, the deodorant powder composition of the present invention is obtained by combining component (A) with component (B) and/or component (C), and therefore excellent spreadability due to the uniformity of adhesion and improved ease of spreading can be obtained, and even when component (D) is further combined, excellent spreadability can be effectively obtained.

Specifically, the aluminum chloro compound includes 1) aluminum chloride and aluminum _{hydroxychloride} having a structure represented by the general formula Al ₂ (OH) _{6 -XClX} (x is 0 to 6), and 2) derivatives of the aluminum hydroxychloride. The aluminum chloro compound may be an anhydride or a hydrate. The aluminum chloride AlCl ₃ is preferably a hexahydrate. The aluminum hydroxychloride includes Al ₂ (OH) ₄ Cl ₂ , Al ₂ (OH) _4.5 Cl _1.5 , and Al ₂ (OH) ₅ Cl. The aluminum hydroxychloride derivative includes allantoin chlorohydroxyaluminum. Among these, aluminum hydroxychloride is preferably used from the viewpoint of obtaining more preferable dispersibility.

The average particle size of the (D) component used in the deodorant powder composition of the present invention is 20 μm or less from the viewpoint of effectively obtaining the dispersibility of the deodorant powder composition. From the viewpoint of obtaining even better dispersibility, the preferred average particle size of the (C) component is 15 μm or less, more preferably 10 μm or less, and even more preferably 8 μm or less. There is no particular restriction on the lower limit of the average particle size of the (C) component, but from the viewpoint of obtaining favorable ease of spreading, it is 2 μm or more, more preferably 5 μm or more.

The content of the (D) component in the deodorant powder composition of the present invention is not particularly limited, and can be appropriately determined depending on the antiperspirant effect (astringent effect) and/or antibacterial effect to be exerted. Specific examples of the content of the (D) component include 5% by weight or more. From the viewpoint of obtaining a higher antiperspirant effect (astringent effect) and/or antibacterial effect, the content is preferably 8% by weight or more, more preferably 9% by weight or more, and even more preferably 10% by weight or more. The upper limit of the content of the (D) component is not particularly limited, but can be, for example, 60% by weight or less. From the viewpoint of shape stability as a powder composition, a more preferable content of the (D) component is 50% by weight or less, more preferably 40% by weight or less, even more preferably 30% by weight or less, and even more preferably 20% by weight or less.

Other Components The deodorant powder composition of the present invention may contain other active components, if necessary, in addition to the above components. From the viewpoint of effectively obtaining dispersibility, the other active components preferably have an average particle size of 20 μm or less, more preferably 18 μm or less. Examples of the active components include antibacterial components other than the above components (benzalkonium chloride, benzethonium chloride, chlorhexidine hydrochloride, phenol, trichlorocarbanilide, chlorhexidine gluconate, isopropylmethylphenol, triclosan, salicylic acid, sorbic acid, lysozyme chloride, hinokitiol, silver oxide, etc.), antiperspirant components other than the above components (aluminum sulfate, aluminum acetate, aluminum chloride, etc.), deodorant components other than the above components (activated carbon, montmorillonite, aluminosilicate, zinc oxide, copper oxide, alumina, titanium oxide, iron oxide, zirconium oxide, water, etc.), and the like. zirconium oxide, etc.), antihistamines (diphenhydramine, diphenhydramine hydrochloride, chlorpheniramine maleate, etc.), local anesthetics (lidocaine, dibucaine, methyl aminobenzoate, procaine, tetracaine, bupivacaine, mepipacaine, chloroprocaine, proparacaine, meprylcaine or their salts, orthocaine, oxethazaine, oxypolyethyleneoxydecane, Scopolia extract, percaminpase, tesitdesitin, etc.), anti-inflammatory agents (allantoin, glycyrrhizic acid, methyl glycyrrhizinate, stearyl glycyrrhizinate, ... Dipotassium ricinate, monoammonium glycyrrhizinate, glycyrrhetinic acid, pyridoxine glycyrrhetinate, stearyl glycyrrhetinate, glyceryl glycyrrhetinate, glycyrrhetinic acid monoglucuronide, salicylic acid, methyl salicylate, glycol salicylate, indomethacin, felbinac, diclofenac sodium, loxoprofen sodium, ufenamate, ibuprofen piconol, suprofen, bendazac, suprofen, bufexamac, etc.), skin protectants (collodion, castor oil, etc.), blood circulation promoters (vanillylamide nonylate, benzyl nicotinate, capsaicin, chili pepper extract, etc.), cooling agents (menthol, camphor, etc.), vitamins (vitamins A, B, D, etc.), mucopolysaccharides (sodium chondroitin sulfate, glucosamine, hyaluronic acid and its salts, etc.), polyhydric alcohols (glycerin, propylene glycol, ethylene glycol, 1,3-butylene glycol, isoprene glycol, diethylene glycol, dipropylene glycol, etc.), humectants (sodium dl-pyrrolidonecarboxylate solution, D-sorbitol solution, macrogol, etc.), plant extracts, fragrances, etc.

In addition, the deodorant powder composition of the present invention may contain bases and additives as necessary in addition to the above-mentioned components, depending on the formulation form. In addition, from the viewpoint of effectively obtaining dispersibility, the other bases and additives preferably have an average particle size of 20 μm or less, more preferably 18 μm or less. The bases and additives are not particularly limited as long as they are pharma- ceutical or cosmetically acceptable, but may include, for example, bulking agents other than those mentioned above (calcium carbonate, clay, kaolin); water; monohydric alcohols (ethanol, propanol, etc.); natural oils (olive oil, safflower oil, soybean oil, camellia oil, corn oil, rapeseed oil, sunflower oil, cottonseed oil, peanut oil, lard, squalane, fish oil, etc.); mineral oils (liquid paraffin, paraffin, gelling hydrocarbons, petrolatum, etc.); waxes and waxes (beeswax, carnauba wax, candy wax, etc.); Lila wax, ceresin, rice wax, microcrystalline wax, etc.), ester oils (isopropyl myristate, isopropyl adipate, diethyl sebacate, isopropyl sebacate, isopropyl palmitate, cetyl palmitate, ethyl oleate, glyceryl tri-2-ethylhexanoate, etc.), fatty acid alkyl esters, fatty acids (stearic acid, oleic acid, palmitic acid, behenic acid, linoleic acid, lanolin, etc.), fatty acid esters (cetyl palmitate, isopropyl palmitate, ethyl linoleate, etc.), medium-chain fatty acid triglycerides, higher alcohols (stearyl alcohol, cetanol, behenyl alcohol, myristyl alcohol, oleyl alcohol, hexadecyl alcohol, lanolin alcohol, cholesterol, dihydrocholesterol, phytosterol, lauryl alcohol, cetostearyl alcohol, linoleyl alcohol, octyldodecanol, hexyldecanol, isostearyl alcohol, etc.), 2-cetyl ethylhexanoate, silicone oils (dimethylpolysiloxane, cyclic silicone, etc.); POE (10-50 mol) phytosterol ether, POE (10-50 mol) dihydrocholesterol ether, POE (10-50 mol) 2-octyldodecyl ether, POE (10-50 mol) decyltetradecyl ether, POE (10-50 mol) oleyl ether, POE (2-50 mol) cetyl ether, POE (5-50 mol) behenyl ether, POE (5-30 mol) polyoxypropylene (5-30 mol) 2-decyltetradecyl ether, POE ( polyoxyethylene alkyl ethers such as polyoxypropylene (10-50 mol) cetyl ether, phosphoric acid and phosphates thereof (e.g., sodium POE cetyl ether phosphate), POE (20-60 mol) sorbitan monooleate, POE (10-60 mol) sorbitan monoisostearate, POE (10-80 mol) glyceryl monoisostearate, POE (10-30 mol) glyceryl monostearate, POE (20-100 mol) polyoxypropylene modified silicone, POE alkyl modified silicone, polyethylene glycol monolaurate, polyethylene glycol monopalmitate, polyethylene glycol monostearate, polyethylene glycol dilaurate, polyethylene glycol dipalmitate, polyethylene glycol distearate, polyethylene glycol dioleate, polyethylene glycol diricinoleate, polyoxyethylene hydrogenated castor oil (5-100), polysorbate (20-85), glycerin fatty acid esters (glycerin monostearate, etc. ), hydrogenated soybean phospholipid, hydrogenated lanolin alcohol and other surfactants; freshening agents (menthol, camphor, borneol, peppermint water, peppermint oil, etc.), preservatives (methylparaben, propylparaben, benzoic acid, sodium benzoate, sorbic acid, etc.), flavoring agents (citral, 1,8-thioneal, citronellal, farnesol, etc.), coloring agents (tar dyes (Brown No. 201, Blue No. 201, Yellow No. 4, Yellow No. 403, etc.), cacao dyes, chlorophyll, aluminum oxide, etc.), pH adjusters (phosphoric acid, hydrochloric acid, succinic acid, Additives include tartaric acid, triethanolamine, triisopropanolamine, etc.), stabilizers (dibutylhydroxytoluene, butylhydroxyanisole, sodium edetate, sodium metaphosphate, L-arginine, L-aspartic acid, DL-alanine, glycine, sodium erythorbate, propyl gallate, sodium sulfite, sulfur dioxide, chlorogenic acid, catechin, rosemary extract, etc.), antioxidants, UV absorbers, chelating agents, adhesives, buffers, dissolution aids, solubilizers, preservatives, etc.

Formulation The formulation of the deodorant powder composition of the present invention is in powder form. By being in powder form, the particles of the active ingredient themselves can be directly applied to the target. Applying the active ingredient in the form of particles to the target maximizes the deodorant effect by applying the active ingredient at the maximum concentration in the fine area where the applied particles come into contact, and is therefore far superior to deodorant compositions formulated in liquid and solid forms. Furthermore, the deodorant powder composition of the present invention has excellent adhesion properties, resulting in excellent uniformity of the particles attached to the target surface, and therefore fine areas where the active ingredient is applied at the maximum concentration are formed evenly over the entire target surface. For this reason, the deodorant powder composition of the present invention has very excellent deodorant properties.

The deodorant powder composition of the present invention may be in the form of either an external preparation that is applied directly to the skin, or a non-external preparation that is not applied directly to the skin. If it is an external preparation, it may be in the form of any of a skin topical medicine, a quasi-drug, or a cosmetic. The deodorant powder composition of the present invention has excellent dispersibility, and is therefore particularly useful when used as a non-external preparation that is inherently difficult to disperse on a target.

Method of Use The deodorant powder composition of the present invention can be used as a deodorant product. When the deodorant powder composition of the present invention is an external preparation, it can be used by directly applying or spraying it on the skin in the same manner as the use of a normal external preparation (powder preparation). Furthermore, when the deodorant powder composition of the present invention is a non-external preparation, it can be used by directly spraying it on an antibacterial target. Examples of antibacterial targets include items that are easily contaminated by sweat or germs due to direct or indirect contact with the skin, more preferably the inside of footwear (shoes, slippers, sandals), footwear (socks, stockings), and the surface of rugs (carpets, carpets, cushion flooring, flooring), more preferably the inside of footwear and socks, which are exposed to high temperatures and humidity and have many opportunities to come into contact with sweat and germs, and even more preferably the inside of footwear that is not washed or has few opportunities to be washed. Among footwear, shoes are particularly preferred because they cover the instep and heel, which are exposed to high temperatures and humidity and have many opportunities to come into contact with sweat and germs, and because of their structure, it is inherently difficult to spray the powder composition inside.

The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these.

Test Example: Synthetic leather (black, polyurethane) that is not textured and is used for footwear insoles was attached to the entire bottom surface of a square petri dish measuring 9 cm long x 13 cm wide. Deodorant powder compositions having the compositions shown in Tables 2 to 4 were prepared. Among the components used in the preparation of the deodorant powder compositions, Al ₂ (OH) ₅ Cl was used as the aluminum hydroxychloride, and baked potassium alum (dried potassium alum) was used as the alum. Approximately 0.25 cm ³ of the deodorant powder composition was placed at the center (1 cm x 1 cm) of the synthetic leather. The petri dish was then placed in a vibrator (ALMIGHTY SHAKER AS-1) and vibrated vertically for 10 seconds (amplitude 4 cm, 250 reciprocations/min) and then horizontally for 10 seconds (same conditions as the vertical direction). The deodorant powder composition that spread on the synthetic leather was evaluated for uniformity of adhesion and ease of spreading by the following method.

(Evaluation of adhesion uniformity)
The adhesion state of the deodorant powder composition on the synthetic leather was classified according to the following criteria, and the adhesion uniformity was evaluated. The results are shown in Tables 2 to 4.
○: The traces of the transferred powder composition are uniformly white. △: The traces of the transferred powder composition are white in linear patterns. ×: The traces of the transferred powder composition are white in dots. Note that, as representative examples, Comparative Example 6 (evaluated as ×), Comparative Example 2 (evaluated as △), and Comparative Example 4 (evaluated as ○) are given in Table 1, and specific adhesion states representing the evaluation criteria for adhesion uniformity are shown.

(Assessment of ease of deployment)
The maximum vertical and horizontal spread distances of the deodorant powder composition were measured, and these maximum spread distances were added up to obtain an index of ease of spread. The larger the spread index, the better the spreadability. The spread index was classified based on the following criteria to evaluate the ease of spread. The level of spreadability that is necessary and sufficient for spraying a relatively small area, such as inside footwear, is ++. The results are shown in Tables 2 to 4.
++++ 97 or more ++++ 87 or more but less than 97
++ 77 or more but less than 87
+ 67 or more but less than 77
- 57 or more but less than 67
-- Less than 57

As shown in Comparative Examples 1 to 3, silicon dioxide shows a tendency for the degree of adhesion uniformity and ease of spreading to change depending on the difference in average particle size, but it was not possible to achieve both. Furthermore, as shown in Comparative Examples 4 and 5, talc and alum have excellent adhesion uniformity but have problems with ease of spreading. Conversely, as shown in Comparative Example 6, aluminum hydroxychloride has excellent ease of spreading but has problems with adhesion uniformity. Furthermore, as shown in Comparative Example 7, even when talc and alum, which have excellent adhesion uniformity, are combined with aluminum hydroxychloride, which has excellent ease of spreading, both properties cannot be achieved at the same time, resulting in an extremely poor ease of spreading.

In contrast, as shown in Examples 1 to 7, when talc and alum, which have excellent adhesion uniformity, were combined with 10 to 45% by weight of silicon dioxide, excellent adhesion uniformity was achieved and ease of spreading was significantly improved. In other words, excellent spreadability was obtained with Examples 1 to 7. On the other hand, as shown in Comparative Examples 8 to 10, problems arose with adhesion uniformity when the silicon dioxide content exceeded 45% by weight.

Claims (6)

(A) silicon dioxide, (B) talc, and/or (C) alum;
The average particle size of the component (A), the component (B), and the component (C) is 20 μm or less,
A deodorant powder composition containing 10 to 45% by weight of the component (A) (excluding those containing silver-supported tricalcium phosphate, alum and zinc oxide) . The deodorant powder composition according to claim 1, wherein the total product of the average particle size (μm) and the content (wt%) of the component (A) is 40 to 510. The deodorant powder composition according to claim 1 or 2, wherein the content of the (A) component per 1 part by weight of the total amount of the (B) component and the (C) component is 0.2 to 1.4 parts by weight. The deodorant powder composition according to any one of claims 1 to 3, wherein the total amount of the (B) component and the (C) component is 35 to 65% by weight. The deodorant powder composition according to any one of claims 1 to 4, further comprising (D) an aluminum chloro compound. The deodorant powder composition according to any one of claims 1 to 5, which is used by being sprinkled inside footwear.