JP2018002682A - Method for producing powder cosmetics - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing powder cosmetics that can achieve both of a use feeling when applied to skin and usability, such as transfer to a puff and drop strength, in a wet production process.SOLUTION: A mist of slurry is sprayed with a sprayer, and the sprayed mist is dried to obtain an extremely fine dry powder.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for producing a powder cosmetic.

Powder cosmetics are manufactured by mixing powder and oily components, etc., crushing the mixture with a pulverizer such as a pulverizer, and filling it into a metal or resin inner dish, or further dry press molding. A method referred to as a dry manufacturing method has been adopted and manufactured.
On the other hand, according to the dry process, characteristics such as feeling of use are not sufficient, so for the purpose of improving the characteristics, a slurry is prepared by adding powder and an oil component to a volatile solvent, and the slurry is put in a container in the state of the slurry. There has been proposed a method called a wet manufacturing method in which a solvent is removed by vacuum suction or the like and the powder is solidified.

  As described above, the dry process leaves room for improvement in the feeling of use in application to the skin, and the wet process has room for improvement because the solid cosmetic becomes too hard and can be taken into a puff. The method also required improvement in order to obtain satisfactory solid cosmetics.

With regard to the above problems, paying attention to the process of drying the slurry in the wet manufacturing method, the slurry is made into fine droplets by mechanical shearing force, and the slurry is dried by sending a dry gas to the fine droplets. And a method for obtaining a powder cosmetic excellent in usability (see Patent Document 1).
In addition, in the wet manufacturing method, by making the blending amount of the powder, oil component and water in the slurry within a specific range, the oil component can be uniformly and efficiently attached to the surface of the powder, and the usability and A method of obtaining a powdered solid cosmetic material having both impact resistance has been disclosed (see Patent Document 2).

JP 2007-055990 A Japanese Patent Laying-Open No. 2015-000855

  As described in Patent Documents 1 and 2, attempts have been studied to achieve both usability when applied to the skin in a wet manufacturing method, and usability such as removal to puffs and drop strength. Also in the present invention, it is an object of the present invention to provide a method for producing a powder cosmetic that can satisfy both the feeling of use when applied to the skin and the usability such as the degree of removal to the puff and the drop strength in the wet manufacturing method. .

  The present inventors have also intensively studied to obtain a powder cosmetic material having both usability and usability, and even if the powder is dispersed in the oil in the form of primary particles in the slurry state, the drying step In other words, the powder was re-agglomerated due to the proximity of the powder, and the powder surface was not uniformly coated with oil. Based on this finding, the inventors have repeatedly studied and have come up with the idea that the re-aggregation of the powder can be suppressed by reducing the particle size of the dried powder when the slurry is dried in the drying step. The inventors have repeatedly studied to make the particle size of the dry powder fine, and found that an extremely fine dry powder can be obtained by spraying the mist of the slurry with a sprayer and drying the sprayed mist.

The present invention includes the following.
(1) A slurry preparation step of preparing a slurry by mixing at least a powder and an oily component in a solvent, and spraying the mist of the prepared slurry with a sprayer, and drying the sprayed mist to dry particles A method for producing a powder cosmetic, comprising a spray drying step.
(2) The method for producing a powder cosmetic according to (1), wherein the sprayer used in the spray drying step includes a nozzle and sprays mist from the tip of the nozzle.
(3) The method for producing a powder cosmetic according to (1) or (2), wherein the powder includes at least a spherical powder.
(4) The method for producing a powder cosmetic according to (1) or (2), wherein the powder includes at least a composite powder in which fine particles are arranged around a plate-like powder.
(5) the spray drying process median diameter D ₅₀ of the resulting dry particles in is 20μm or less, (1) to (4) method of producing a powder cosmetic according to any one of.
(6) The method for producing a powder cosmetic according to any one of (1) to (5), further comprising a molding step of filling a mold with the dry particles obtained in the spray drying step.
(7) The manufacturing method of the powder cosmetics in any one of (1)-(6) whose powder cosmetics are loose powder.
(8) The method for producing a powder cosmetic according to any one of (1) to (6), wherein the powder cosmetic is a pressed powder.
(9) A loose powder containing at least fine particles having an average particle size of 10 μm or less and a loose powder containing an oil component, wherein the median diameter D ₅₀ is 20 μm or less.
(10) A powder containing at least fine particles having an average particle size of 10 μm or less, and a pressed powder containing an oil component,
A pressed powder having a median diameter D ₅₀ of 20 μm or less of a pressed powder of 250 μm mesh pass among pressed powders scraped by a puff.

According to the present invention, it is possible to provide a powder cosmetic that can achieve both usability when applied to the skin and usability. Furthermore, since the powder surface is uniformly coated with oil and can prevent aggregation, it is possible to maximize the functions of the powder, and cosmetics containing fine particle titanium oxide, fine particle zinc oxide, etc. The SPF value can be improved in a cosmetic and a cosmetic containing a composite powder in which fine particles are arranged around a plate-like powder.
Further, in the wet manufacturing method, the ultraviolet absorber tends to be sucked together at the time of vacuum suction, and it is difficult to improve the SPF value. However, in the present invention, the effect of the SPF value by adding the ultraviolet absorber is sufficient. To be played.

FIG. 3 is a graph showing the particle size distribution of the dry powder produced in Example 1. It is a figure which shows the particle size distribution of the dry powder manufactured in Example 4. FIG. It is a cross-sectional schematic diagram which shows the front-end | tip of the nozzle of the sprayer which can be used for the spray-drying process in this embodiment.

  Hereinafter, although the manufacturing method of the powder cosmetics which are embodiment of this invention is demonstrated, the technical scope of this invention is not limited only to the following specific embodiment.

The method for producing a powder cosmetic according to the present embodiment includes a slurry preparation step of preparing a slurry by mixing at least a powder and an oil component in a solvent, and spraying the mist of the prepared slurry with a sprayer. It is a manufacturing method of powder cosmetics which has a spray-drying process which obtains dry particles by drying made mist. Moreover, you may further have a collection process which collect | recovers the dry particles obtained at the said spray-drying process, and also has a shaping | molding process which fills the mold with the dry particles obtained at the said spray-drying process, and shape | molds. Also good.

<Slurry preparation process>
The slurry preparation step is a step of preparing a slurry by mixing at least a powder and an oil component in a solvent. In preparing the slurry, components other than the powder and oil component necessary for preparing the cosmetic can be added as appropriate.

1) Powder The powder that can be used in the present embodiment is a general term for organic or inorganic solids that do not dissolve in cosmetic raw materials such as water, fats and oils, surfactants, alcohols, and silicones.
Specific examples of the powder include kaolin, talc, mica, sericite, titanium mica, laminated resin pieces (glitter), borosilicate Ca / Al, titanium sericite, titanium dioxide, iron oxide, zinc oxide, ultramarine, bitumen, Red No. 102, Red No. 226, Yellow No. 4 aluminum lake, silica, alumina, calcium silicate, magnesium silicate, calcium carbonate, magnesium carbonate, methylsiloxane network polymer, cross-linked methylpolysiloxane resin, alkyl acrylate resins, nylon Examples thereof include silk, cellulose, and composite materials thereof.
The shape of the powder may be spherical, indeterminate, porous, hollow, fibrous, plate-like, or massive. Furthermore, the surface may be subjected to generally known surface treatments such as a silicone coating treatment, a metal soap coating treatment, and an acylamino acid salt coating treatment.

Only one type of powder may be blended in the slurry, or two or more types may be blended in combination.
In the present embodiment, the content of the powder is usually 70% by mass or more in the powder cosmetic, preferably 75% by mass or more, more preferably 80% by mass or more, and 85% by mass or more. Is more preferable. Moreover, it is 98 mass% or less normally, and it is preferable that it is 95 mass% or less.

  In this embodiment, a fine dry powder can be obtained by a spray drying process as will be described later. Therefore, it can be particularly preferably applied when the fine particle powder is contained, and the scattering effect of the fine particle powder can be sufficiently exhibited, and the SPF value is improved. Moreover, when containing spherical powder, it can apply preferably, when containing the composite powder by which microparticles | fine-particles are arrange | positioned around plate-shaped powder.

As spherical powder, organic spherical resin powder such as nylon, styrene, methyl methacrylate, polymethylsilsesquioxane powder, organopolysiloxane elastomer powder, inorganic such as silica, alumina, titanium oxide, magnesium carbonate, calcium silicate, etc. Examples thereof include spherical powders, and these spherical powders are preferably 3% by mass or more, more preferably 5% by mass or more, and preferably 20% by mass or less, more preferably 15% by mass or less, based on the total amount of the powder. By blending, it is possible to maintain the drop strength while improving the usability such as spreading and spreading, and the caking property is also improved.
The average particle diameter of the spherical powder is usually 1 μm or more, preferably 3 μm or more, and usually 50 μm or less, preferably 30 μm or less, from the viewpoint of usability such as elongation and spread. The spherical powder may be surface-treated by a known method for the purpose of improving dispersibility and adhesion. The surface treatment may be a hydrophobic treatment or a hydrophilic treatment depending on the purpose.

Examples of the composite powder in which fine particles are arranged around the plate-like powder include SMT-57S (manufactured by Teika Co., Ltd.), and these composite powders are preferably 4% by mass or more based on the total amount of the powder. More preferably 6% by mass or more, and preferably 30% by mass or less, more preferably 25% by mass or less, the drop strength is improved and the SPF value can be improved without causing caking properties.

  Examples of the fine particle powder include fine particle titanium oxide and fine particle zinc oxide, which are referred to herein as fine particles having an average particle diameter of 10 μm or less, may be 1 μm or less, may be 500 nm or less, and may be 100 nm or less. Good. By adding the fine particle powder to the total amount of the powder, preferably 0.5% by mass or more, more preferably 5% by mass or more, and preferably 20% by mass or less, more preferably 15% by mass or less, the drop strength is reduced. The caking property is improved, the SPF value is improved, and the transparency is not impaired when applied to the skin.

Thus, according to the present embodiment, the powder surface is evenly coated with oil even in the case of fine particle powder, and aggregation can be prevented, so that the function of the powder can be maximized. It becomes possible.
In addition, powder may be mix | blended only 1 type and may mix | blend 2 or more types in combination.
In the present embodiment, the content of the powder is usually 65% by mass or more in the powder cosmetic, preferably 70% by mass or more, more preferably 75% by mass or more, and 80% by mass or more. Is more preferable. Moreover, it is 95 mass% or less normally, it is preferable that it is 90 mass% or less, and it is more preferable that it is 85 mass% or less.

2) Oily components Specific examples of oily components that can be used in the present embodiment include macadamia nut oil, avocado oil, corn oil, olive oil, rapeseed oil, sesame oil, castor oil, safflower oil, cottonseed oil, jojoba oil, coconut oil, Animal and vegetable oils such as palm oil and liquid lanolin; hydrocarbon oils such as liquid paraffin, squalane and pristane; liquid fatty acids such as oleic acid and isostearic acid; liquid higher alcohols such as isostearyl alcohol and octyldodecanol; cetyl isooctanoate and myristine Isopropyl acid, hexyldecyl isostearate, diisopropyl adipate, di-2-ethylhexyl sebacate, cetyl lactate, diisostearyl malate, ethylene glycol di-2-ethylhexanoate, neopentyl glycol dicaprate, di-2-heptyl Glycerin undecanoate, glycerin tri-2-ethylhexanoate, cetyl ethylhexanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentane erythritol tetra-2-ethylhexanoate, glyceryl triiso Synthetic ester oils such as stearate and glyceryl triisooctanoate; chain polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and diphenylpolysiloxane; octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexanesiloxane, etc. Cyclic polysiloxanes such as amino-modified polysiloxanes, polyether-modified polysiloxanes, alkyl-modified polysiloxanes, fluorine-modified polysiloxanes, etc. Silicone oils such as Rokisan; and the like. However, what belongs to the specific surfactant group mentioned later shall not be handled as an oil-based component.

Only 1 type may be mix | blended and an oil-based component may be mix | blended in combination of 2 or more type.
In the present embodiment, when the oil component is blended, it is usually 5% by mass or more in the cosmetic, and preferably 10% by mass or more. Moreover, it is 25 mass% or less normally, and it is preferable that it is 20 mass% or less.

3) Solvent The solvent may be any solvent that is usually used to prepare a slurry. Examples include purified water, volatile silicone oil, lower alcohols, ethers, volatile hydrocarbon oils, pyrrolidones, and the like. Moreover, you may mix and use these.
The amount of the solvent may be an amount sufficient to mix the powder and the oily component.
50 mass parts or more and 200 mass parts or less are used with respect to 0 mass part.

4) Others The powder cosmetics produced in the present embodiment can be widely blended with components that are usually used in powder cosmetics.

For example, whitening ingredients, anti-inflammatory ingredients, plant extracts and the like can be mentioned as active ingredients.
In addition, as surfactants, fatty acid soap (sodium laurate, sodium palmitate, etc.), anionic surfactants such as potassium lauryl sulfate, alkylethanol triethanolamine ether, stearyltrimethylammonium chloride, benzalkonium chloride, lauryl Cationic surfactants such as amine oxides,
Betaine surfactants (alkyl betaines, amide betaines, sulfobetaines, etc.), imidazoline amphoteric surfactants (such as 2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt), acylmethyl taurine Amphoteric surfactants such as
Sorbitan fatty acid esters (such as sorbitan monostearate and sorbitan sesquioleate), glycerin fatty acids (such as glyceryl monostearate), propylene glycol fatty acid esters (such as propylene glycol monostearate), hydrogenated castor oil derivatives, glycerin alkyl ether POE sorbitan fatty acid esters (POE sorbitan monooleate, polyoxyethylene sorbitan monostearate, etc.), POE sorbite fatty acid esters (POE-sorbitol monolaurate, etc.), POE glycerin fatty acid esters (POE-glycerin monoisosteare) Rate), POE fatty acid esters (polyethylene glycol monooleate, POE distearate, etc.), POE alkyl ethers (POE2-octyl) Decyl ether, etc.), POE alkylphenyl ethers (POE nonylphenyl ether, etc.), pluronic types, POE / POP alkyl ethers (POE / POP2-decyltetradecyl ether, etc.), tetronics, POE castor oil / cured castor Examples include oil derivatives (POE castor oil, POE hydrogenated castor oil, etc.), nonionic surfactants such as sucrose fatty acid esters, alkyl glucosides, and the like.

  Polyhydric alcohols include polyethylene glycol, glycerin, 1,3-butylene glycol, erythritol, sorbitol, xylitol, maltitol, propylene glycol, dipropylene glycol, diglycerin, isoprene glycol, 1,2-pentanediol, 2,4 -Hexylene glycol, 1,2-hexanediol, 1,2-octanediol and the like.

  Thickeners include guar gum, quince seed, carrageenan, galactan, gum arabic, pectin, mannan, starch, xanthan gum, curdlan, methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, methylhydroxypropylcellulose, chondroitin sulfate, dermatan sulfate, glycogen, Heparan sulfate, hyaluronic acid, sodium hyaluronate, tragacanth gum, keratan sulfate, chondroitin, mucoitin sulfate, hydroxyethyl guar gum, carboxymethyl guar gum, dextran, kerato sulfate, locust bean gum, succinoglucan, caronic acid, chitin, chitosan, carboxymethyl Chitin, agar, polyvinyl alcohol, polyvinylpyrrolidone, carboxyvinyl polymer, al Le-modified carboxyvinyl polymers, sodium polyacrylate, polyethylene glycol, and bentonite.

Examples of the UV absorber include paraaminobenzoic acid UV absorbers, anthranilic acid UV absorbers, salicylic acid UV absorbers, cinnamic acid UV absorbers, benzophenone UV absorbers, sugar UV absorbers, 2- (2 UV absorbers such as'-hydroxy-5'-t-octylphenyl) benzotriazole, 4-methoxy-4'-t-butyldibenzoylmethane, and the like.

  The method of slurrying in slurry preparation is not particularly limited, and a known method can be used. For example, it can be made into a slurry by adding a powder and an oily component in a solvent, and other components as necessary, and mixing and stirring using a disper mixer, a homogenizer, a planetary mixer, a stirring mill, or the like.

<Spray drying process>
The spray drying step is a step of obtaining fine particles of a dry powder by spraying the prepared slurry mist with a sprayer and drying the sprayed mist.
The sprayer is not limited as long as the slurry can be atomized and sprayed, and an existing sprayer can be applied. In the present embodiment, a sprayer having a nozzle, which is a sprayer that sprays mist from the tip of the nozzle, is preferable because it is easy to dry the mist in the subsequent drying step and it is also easy to recover.
An example of a nozzle capable of misting and spraying slurry will be described with reference to FIG. The shape of the nozzle is not limited to that shown in FIG. 3 as long as mist can be sprayed.

  A nozzle 100 shown in FIG. 3 is arranged around a cylindrical nozzle edge 1 having a sharp shape at one end, and the cylindrical nozzle edge 1, and a slit serving as a slurry flow path 10 is formed between the nozzle edge 1 and the nozzle 100. The first ring member 2 to be formed and the second ring member 3 which is disposed around the first ring and forms a slit which becomes the gas flow path 20 between the first ring and the first ring.

One end (upper end in the figure) of the nozzle edge 1 has a sharp shape, and one end (upper end in the figure) of the first ring member has a tapered shape so as to form the same plane as the sharp slope.
The slurry flow path 10 has a ring shape, and the slurry is injected in a ring shape from the slurry injection port 11. On the other hand, the gas flow path 20 is also ring-shaped, and the airflow is ejected from the airflow outlet 21 in a ring shape. Here, one end of the first ring member is tapered so as to form the same plane as the sharp slope of the nozzle edge 1. Therefore, the airflow jetted at high speed from the airflow injection port 21 causes the slurry injected from the slurry injection port 11 to flow toward the tip of the nozzle edge at high speed and collide at the collision point 30, and the slurry is in a fine mist shape. Can be sprayed.
In the present embodiment, as shown in FIG. 3, the slurry is made into a fine mist by using a nozzle having a mechanism for generating a mist by causing the slurry to flow from different directions and causing the slurry to collide at a collision point. Is possible and preferable. In the cross-sectional view of FIG. 3, there are two airflow channels, but the configuration is not limited to this, and there may be a configuration in which four airflow channels exist in the cross section.

  At this time, the injection flow rate of the slurry, the injection flow rate of the air flow, the flow rate of the air flow, and the like can be appropriately set according to the viscosity of the slurry, the particle size of the desired mist, and the like. The smaller the mist particle size, the smaller the particle size of the powder when dried, so the mist average particle size is preferably 30 μm or less, more preferably 20 μm or less, and more preferably 10 μm or less. More preferably. Even if a fine mist is generated, if the slurry contains a powder having a larger particle size, the powder does not become a fine mist, and particles near the particle size of the powder are sprayed. The The average particle diameter of submicron order fine particles, for example, mist containing fine particle titanium oxide or fine particle zinc oxide is preferably 20 μm or less, more preferably 10 μm or less, and even more preferably 5 μm or less. The average particle size of mist can be calculated by enlarging an image taken with a high-speed camera or the like and measuring the average particle size of the major axis of 20 or more mists (droplets) on the screen. .

The sprayed mist of the slurry is dried to become dry particles and collected. In general, a high-temperature drying gas is used for drying, and the slurry becomes dry particles by spraying a drying gas having a temperature at which the solvent used evaporates on the mist of the slurry. The dry particles are collected as appropriate, but it is preferable to use an apparatus that can collect them together with a sprayer or a dryer.

  In the present embodiment, the slurry is misted and dried particles are obtained by drying the mist, so that the particle size of the dried particles can be finely controlled. In particular, when a fine particle powder is included, since the oil component can be coated on each fine particle powder, the feeling of use is dramatically improved. Moreover, when it is molded and solidified, its drop strength is remarkably improved. Furthermore, since the function of the powder can be exhibited to the maximum, for example, in the case of a cosmetic compounded with fine particle titanium oxide, fine particle zinc oxide, etc., there is an unpredictable effect such as an improvement in SPF value. Is.

Specifically, the median diameter D _{50 of the} dried particles obtained by the spray drying process is preferably 20 μm or less, more preferably 17 μm or less, further preferably 13 μm or less, and 10 μm or less. May be. Incidentally, the median diameter D ₅₀ can be measured by a laser diffraction particle size distribution measuring apparatus.
Further, in a cosmetic containing fine particle titanium oxide and / or fine particle zinc oxide, the particle size distribution of the dry particles obtained by the spray drying step preferably has a maximum value of 20 μm or less, and has a maximum value of 17 μm or less. More preferably, it has a maximum value of 13 μm or less, and may have a maximum value of 10 μm or less, and the maximum value is preferably derived from fine particles such as fine particle titanium oxide and fine particle zinc oxide.
In the case of a molded powder cosmetic, the cosmetic is scraped off with a puff, the scraped cosmetic is classified with a 250 micron mesh, and the particle size of the cosmetic after the classification is measured, The particle size of the dry powder obtained by the spray drying process can be measured. The inventors of the present invention have confirmed that the particle size of the molded powder cosmetic measured by the above method almost coincides with the particle size of the dry powder in the dry spraying process.

In the case of an unmolded powder cosmetic such as loose powder, the particle diameter of the dry particles obtained by the spray drying process can be obtained by measuring the particle diameter as it is.
That is, another embodiment of the present invention is a loose powder containing at least a fine particle having an average particle diameter of 10 μm or less and a loose powder containing an oil component, wherein the median diameter D ₅₀ is 20 μm or less. is there.
Further, among the pressed powder containing at least fine particles having an average particle diameter of 10 μm or less and a pressed powder containing an oily component, the median diameter D of the pressed powder having a 250 μm mesh pass among the pressed powder scraped by the puff. ₅₀ is a pressed powder having a diameter of 20 μm or less.

<Molding process>
In the present embodiment, the molding process provided as desired is a process of filling the mold with the dry powder obtained in the spray drying process. It may be formed into pressed powder by molding, or may be loose powder without molding. When the pressed powder is used, the feeling of use is preferable and the drop strength is improved. When using loose powder, a feeling of use is preferable.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, the technical scope of this invention is not limited only to the illustrated example.

(Examples 1 to 4, Comparative Examples 1 to 4)
<Slurry preparation>
120 parts by mass of pure water was added to 100 parts by mass of the powders and oils listed in Table 1, and stirred using a double planet mixer (DPM) to prepare a slurry.

<Spray drying>
The prepared slurry according to Examples 1 to 3 is sprayed with a mist at a flow rate of 4 g / min of the air flow for spraying the slurry by a sprayer equipped with a nozzle having the structure shown in FIG. Obtained. The median diameter D ₅₀ of the obtained dry particles was as shown in Table 1.
Further, dry particles were obtained in the same manner as in Example 1 except that the flow rate of the air flow for spraying the slurry was changed to 8 g / min. The median diameter D ₅₀ of the obtained dry particles was as shown in Table 1. FIG. 1 shows the particle size distribution of the dry particles obtained in Example 1, and FIG. 2 shows the particle size distribution of the dry particles obtained in Example 4.
The dried particles were molded with a press to obtain a pressed powder.

  The prepared slurry according to Comparative Examples 1 to 3 was filled in a container, compression molded, and dried to obtain a pressed powder.

The prepared slurry according to Comparative Example 4 was dried with an airflow dryer (a device in which a shearing force was applied to the slurry by a rotating drum to form particles) to obtain dry particles. The median diameter D ₅₀ of the obtained dry particles was as shown in Table 1. The dry particles according to Comparative Example 4 were molded with a press to obtain a pressed powder.

<Evaluation>
The obtained pressed powder was evaluated according to the following items and evaluation criteria.
-Uniformity of elongation and spread: 10 evaluators evaluated using pressed powder.
◎: 9 or more out of 10 responded that the spread is uniform ○: 6-8 out of 10 responded that the spread was uniform △: 3-5 out of 10 were spread and spread uniformly Answer X: 0 to 2 out of 10 responded that the spread was uniform. Softness of touch and feel: 10 evaluators used and evaluated pressed powder.
◎: 9 or more out of 10 responded that the feel was soft ○: 6-8 out of 10 responded that the feel was soft △: 3 out of 10 responded that the feel was soft ×: 0 out of 10 ~ 2 respondents said that the touch was soft. Finished powdery: 10 evaluators used and evaluated pressed powder.
◎: Nine or more out of 10 responded that there was no finished powdery ○: Six to eight out of 10 responded that there was no finished powdery △: Three to five out of 10 finished Reply if there is no powderiness ×: 0 to 2 out of 10 respondents that there is no finished powdery

-Drop strength: About each pressed powder, the state after dropping 5 times on 50-mm-thick plywood from the height of 50 cm was evaluated based on the following evaluation criteria.
◎: No cracks or chippings ○: Slight cracking or chipping on the surface △: Partial cracking or chipping ×: Overall cracking or chipping

SPF effect: Each pressed powder was applied to surgical tape (Transsphere 3M Healthcare Co., Ltd.) with a loading amount of ² mg / cm ^{2 and} a size of 6.4 cm × 6.4 cm, and UV-2000S manufactured by Labsphere. The SPF value was determined from the average protection spectrum obtained by 10 measurements using an SPF analyzer. In Table 1, relative values with the measured value of Example 1 as 1 are shown.

(Example 5 and Comparative Example 5)
<Slurry preparation>
It added to 120 mass parts of pure water with respect to 100 mass parts of powder and oil agent total of Table 2, and stirred using the double planet mixer (DPM), and the slurry was prepared.
<Spray drying>
The prepared slurry according to Example 5 was sprayed with mist by a sprayer equipped with a nozzle having the structure shown in FIG. 3 and dried to obtain dry particles. The median diameter D ₅₀ of the obtained dry particles was as shown in Table 2.
Moreover, the obtained slurry was dried with an airflow dryer (a device that applies a shearing force to the slurry by a rotating drum to obtain particles), thereby obtaining dry particles. The median diameter D ₅₀ of the obtained dry particles was as shown in Table 2.
The dried particles were used as loose powder.

100 Nozzle 1 Nozzle edge 2 First ring member 3 Second ring member 10 Slurry flow channel 11 Slurry injection port 20 Gas flow channel 21 Gas injection port 30 Collision point

Claims (10)

A slurry preparation step of preparing a slurry by mixing at least a powder and an oily component in a solvent; and spraying the mist of the prepared slurry with a sprayer to obtain dry particles by drying the sprayed mist A method for producing a powder cosmetic comprising a drying step.   The manufacturing method of the powder cosmetics of Claim 1 with which the sprayer used in the said spray-drying process is provided with a nozzle, and sprays mist from the front-end | tip of this nozzle.   The method for producing a powder cosmetic according to claim 1, wherein the powder includes at least a spherical powder.   The method for producing a powder cosmetic according to claim 1 or 2, wherein the powder includes at least a composite powder in which fine particles are arranged around a plate-like powder. The spray-dried median diameter D ₅₀ of the resulting dry particles is 20μm or less in the step, the powder cosmetic method according to any one of claims 1 to 4.   The manufacturing method of the powder cosmetics of any one of Claims 1-5 which further has the shaping | molding process which fills the type | mold with the dry particle obtained at the said spray drying process, and shape | molds.   The manufacturing method of the powder cosmetics of any one of Claims 1-6 whose powder cosmetics are loose powder.   The manufacturing method of the powder cosmetics of any one of Claims 1-6 whose powder cosmetics are pressed powder. A loose powder comprising at least fine particles having an average particle size of 10 μm or less and a loose powder containing an oil component, wherein the median diameter D ₅₀ is 20 μm or less. A powder containing at least fine particles having an average particle size of 10 μm or less, and a pressed powder containing an oil component,
A pressed powder having a median diameter D ₅₀ of 20 μm or less of a pressed powder of 250 μm mesh pass among pressed powders scraped by a puff.