JP2003104718A - Plate-like compound powder and its producing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate-like compound powder in which a plate-like particle is very smooth, with low brightness and with high safety and its producing method. SOLUTION: The plate-like compound powder contains a plate-like compound of which the ratio of end surface thickness to central thickness of a layer surface is 0.9-1.0 by 60% or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-shaped compound powder and a method for producing the same, and more particularly to improvement of smoothness, low gloss of plate-shaped particles and safety of powder.

[0002]

2. Description of the Related Art Plate-like compound powders are used in cosmetics and the like because of their excellent sliding property. Conventionally, the plate-like compound powder is produced by a crystal growth method, or the plate-like compound crystal lumps are fragmented by an ordinary crusher, further finely pulverized using a hammer mill, a roll mill, a ball mill, etc., and produced by classifying. Was there.

Further, the plate-like synthetic fluoromica powder obtained by such a conventional production method using synthetic fluoromica as a crystalline substance contains fluorine which is easily eluted, and the powder comes into contact with water. Then, since fluorine is eluted, it is not preferable from the viewpoint of safety when used near cosmetics such as cosmetics.

Therefore, conventionally, in order to suppress the elution amount of fluorine in the plate-like synthetic fluoromica powder in water, the plate-like synthetic fluoromica powder obtained by the conventional manufacturing method is fired to remove excess fluorine. The amount of elution of fluorine was suppressed by skipping.

[0005]

However, the shape of the plate-like compound obtained by such a conventional manufacturing method has a step toward the end face side as shown in FIG. 2, and the unevenness is uneven on the end face side. Is occurring. If there is such a step or unevenness, there is a problem that the smoothness of the layer surface is impaired and the characteristics such as the smoothness of the powder are affected.
Further, in the present production method, when the content of particles having smoothness is increased and the slipperiness is improved, the gloss value is also increased at the same time, so it is difficult to obtain a powder having low gloss and good slipperiness.

Further, even after the plate-like synthetic fluoromica powder obtained by the conventional manufacturing method is subjected to the firing treatment, 13-20 ppm of fluorine is eluted from the powder as a fluorine elution amount by the severe elution test method. Therefore, in consideration of being used in the vicinity of the human body such as cosmetics, there has been a demand for a plate-like synthetic fluoromica that has the least amount of fluorine elution. The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is a plate-like crystalline compound powder having high smoothness of plate-like particles, low gloss, and high safety of powder, and a production method thereof. To provide.

[0007]

Means for Solving the Problems As a result of intensive studies made by the present inventors in order to achieve the above-mentioned object, it was found that by pulverizing with a high pressure homogenizer at a differential pressure of 100 kg / cm ² or more, the smoothness is high and low. It was found that a bright plate-like compound can be obtained. Further, in the case of using synthetic fluoromica as a crystalline substance, it was found that a plate-shaped synthetic fluoromica having a fluorine elution amount of less than 10 ppm can be obtained by further performing heat treatment at 500 to 1200 ° C. I arrived. That is, the plate-like compound powder according to the present invention is characterized by containing 60% or more of a plate-like compound having an end face thickness / layer face center portion thickness of 0.9 to 1.0.

Further, the above-mentioned powder is characterized by having a gloss value of 3.5 or less by a gloss value measuring method described below. <Measurement method of gloss value> About 5-6 cm on white cardboard
Stick the double-sided tape cut to the length of. On the double-sided tape, a piece of cellophane tape cut into about 5 to 6 cm is attached with the adhesive surface facing up so that air does not enter between the double-sided tape and the piece of cellophane tape. Place excess powder on top of cellophane tape and apply it 10 times in the same direction with a cosmetic brush. Brush off excess powder on the cellophane tape and on the brush, and apply it 10 times in the same direction with a brush. It is measured with a gloss meter (“VG-2PD” manufactured by Nippon Denshoku Industries Co., Ltd.) so that incident light → reflection occurs in a familiar direction. The incident-reflection angle is 60 ° -60 °. The zero point and span of the gloss meter must be adjusted once for each series of measurements and before the measurement. For the adjustment of the span, a reflector having a gloss value of 89 is used.

Further, the plate-like synthetic fluoromica powder according to the present invention is characterized in that the elution amount of fluorine in water by the severe elution test method is less than 10 ppm. In addition, it is preferable to mix the plate-like compound powder with a cosmetic.

Further, the method for producing a plate-like compound powder of the present invention is characterized by including a pulverizing step of pulverizing the plate-like compound powder as a raw material with a high pressure homogenizer at a differential pressure of 100 kg / cm ² or more. And

Further, the method for producing a plate-like synthetic fluoromica powder of the present invention comprises a pulverizing step of using a high-pressure homogenizer to pulverize the raw plate-like synthetic fluoromica powder at a differential pressure of 100 kg / cm ² or more. , 500 to 12 after the crushing step
It is characterized by including a heat treatment step of heat treatment at 00 ° C.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The plate-like compound of the present invention is produced using a plate-like compound having an aspect ratio of 10 or more as a raw material. As a substance that constitutes the plate-like compound, apatite,
In addition to naturally occurring minerals such as corundum and cristobalite, natural or synthetic layered silicates such as mica, talc and pyrophyllite, or aluminum hydroxide,
Artificial substances such as aluminum oxide and glass flakes can be used.

The plate-like compound is subjected to a differential pressure of 100 kg / cm ² or more, preferably 300 using a high-pressure homogenizer.
The particles are accelerated by applying a pressure drop of not less than kg / cm ² , and the plate-like compound of the raw material is crushed by the shearing force applied at that time and the impact force caused by the accelerated particles colliding with the wall surface or liquids. At that time, the plate-shaped compound of the raw material is
Sudden pressure drop, shearing force, and impact force cause cracks in the surface direction to form fine particles. At the same time, by removing the irregularities on the particle surface by a sudden pressure drop and shearing force,
It is considered that the steps of the layer surfaces and the unevenness of the end faces, which are seen in a normal plate crystal as shown in FIG. 2, are removed, and the plate has a substantially flat plate shape as shown in FIG.

The high-pressure homogenizer used for pulverizing the plate-like compound is composed of a booster pump and a fine orifice tube called a chamber or unit. The diameter of the fine orifice tube is appropriately determined in consideration of the characteristics of the substance before and after the treatment. The high-pressure homogenizer uses cavitation, impact force, and shearing force as elements for pulverization, and the interaction between these produces particles after pulverization. Each of these elements will be described below.

[0015]Cavitation Cavitation is not under high pressure with the rapid flow of fluid.
The pressure drops in the liquid due to the release from the
It is a growing bubble. Liquids tend to vaporize if the pressure drops
It will become 0.03a even if water boils at 1 atm and 100 ° C.
At tm, the boiling point is 15 ° C. Cause a sudden pressure drop
The rubbed liquid becomes vapor and forms bubbles in the water.
Destroys when the pressure returns. At this time, several thousand degrees or more
In addition, an impact force of 1000 atm or more is generated. High pressure system homo
The Genizer is designed to move liquid into a fine orifice tube at high speed.
Moreover, it is a mechanism for flowing under high pressure. Therefore, Orif
Inside the gas pipe (high-speed liquid flow), orifice pipe outlet (liquid
Cavitation occurs due to the pressure drop) and mixes in the liquid.
It can give a great impact to existing substances and
Also, the force of peeling, mixing, and dispersion works.

[0016]Impact force A fine orientation of a part called a chamber or unit
The shape of the fiss tube can be changed depending on the liquid to be treated.
When colliding liquids with each other, divide the pipe into two directions.
After that, it converges on one path. Impact between colliding liquids
Addition, crushing or exfoliating, mixing, dispersing to mixed substances
The power of works. Also, make an angle to the orifice pipe path.
With the method of colliding the liquid with the wall surface and applying an impact force,
However, the above effects can be obtained.

[0017]Shear force The liquid moves at high speed through a fine orifice pipe,
The substances mixed in the material also move at high speed. Partial velocity in the flow
Due to the difference, a shear force is applied to the mixed material. In addition,
Shear force as well as shear stress due to rubbing between existing substances
Works, crushing or peeling off substances mixed in the liquid, mixing
If so, disperse.

The plate-like compound powder obtained by the above-described action of the high-pressure homogenizer has low gloss, but its smoothness improves the sliding of the powder. In addition, it is expected that the activity of the particle surface is reduced, aggregation is unlikely to occur, and even if it occurs, the aggregation can be easily released. Further, the powder obtained by the production method of the present invention has a very small dispersion of the particle size distribution as compared with the conventional production method, and therefore exhibits a high yield after classification and is industrially effective. From the above characteristics, the plate-like compound powder is a raw material for cosmetics, a filler for resin,
Suitable for a wide range of applications such as pearlescent pigments.

A plate-like synthetic fluoromica is used as a plate-like compound as a raw material, and a differential pressure of 1 is obtained by using a high-pressure homogenizer.
00kg / cm ² or more, preferably 500 kg / cm ²
By applying the above-mentioned pressure drop, a considerable amount of fluorine, which is easily eluted near the surface of the synthetic fluoromica during the treatment process by the high-pressure homogenizer, is dissolved in water. It is considered that this is due to the heating effect and impact force due to cavitation, the shearing force applied to the accelerated particles, the impact force caused by the accelerated particles hitting the wall surface or the liquids, and the like. Then, the treated slurry is classified and dried,
By heat treatment at 500 to 1200 ° C., a plate-like synthetic fluoromica powder having an elution amount of fluorine in water suppressed to less than 10 ppm by a later-described severe elution test method can be obtained.

According to such a method for producing a plate-like synthetic fluoromica powder, it is possible to significantly suppress the amount of fluorine elution in the conventional firing step, which is industrially effective. Further, the plate-like synthetic fluoromica powder thus obtained is suitable for applications such as foundations for cosmetics, lipsticks, creams, etc. due to its low fluorine elution amount.

[0021]

The present invention will be described in detail below with reference to examples.
However, the present invention is not limited to these examples.Example 1 1 of synthetic fluorophlogopite with an initial average particle size of 48.47 μm
0% suspension made by Mizuho Kogyo Co., Ltd.
It was crushed using a Z-M-210EH type. Grinding conditions are different
Pressure 1500kg / cm^Two, Flow rate 1.0 liter per minute, Z
Chamber (a chamber that crushes accelerated particles against the wall to crush them)
Process). As a result, the particle size is 14.87 μm
It was pulverized to (σ 2.36 μm). After grinding, classify and obtain
Scanning electron microscope was used to
I observed. The photograph is shown in Fig. 3 ((A) plane direction, (B) end face)
Direction), and the average of the thickness of the end face / the thickness of the center of the layer face
And the thickness of the end face / the thickness of the central part of the layer face is 0.9 to 1.0
Table 1 shows the content of the particles and the gloss value of the powder. In addition,
End face thickness / layer Average of center face thickness and end face thickness / layer
The content of particles having a thickness of 0.9 to 1.0 in the center of the surface is
Photograph of particles obtained by a scanning electron microscope with n number of 50
Observed and calculated. In addition, the gloss value of the powder is
It was measured by the following method.

<Measurement method of gloss value> On a white cardboard,
Stick double-sided tape cut to a length of about 5-6 cm.
On the double-sided tape, a cellophane tape cut into about 5 to 6 cm is attached with the adhesive side up. At this time, be careful not to let air enter between the double-sided tape and the cellophane tape. Also, be careful not to damage the adhesive surface of the cellophane tape. Place excess powder on top of cellophane tape and apply it 10 times in the same direction with a cosmetic brush. After removing the excess powder on the tape and brush, 1 more
Break in 0 times in the same direction. It is measured with a gloss meter (“VG-2PD” manufactured by Nippon Denshoku Industries Co., Ltd.) so that incident light → reflection occurs in a familiar direction. The incident-reflection angle is 60
The degree is -60 degrees. The zero point and span of the gloss meter must be adjusted once for each series of measurements and before the measurement. For the adjustment of the span, a reflector having a gloss value of 89 is used.

[0023]Example 2 A 20% suspension of synthetic fluorophlogopite as in Example 1 was carried out.
Crushing and classification were carried out under the same conditions as in Example 1. As a result, particle size 1
Crushed to 2.78 μm (σ2.16 μm)
Particles having an average particle diameter of 10 μm were obtained by classification. Example 1
Thickness of end face / thickness of center of layer face obtained by the same method as
Evenly, the thickness of the end face / the thickness of the central part of the layer face is 0.9 to 1.0
The content of the particles and the gloss value of the powder are shown in Table 1.

[0024]Example 3 A synthetic fluorophlogopite 10% suspension similar to that of Example 1 was
Pressure is 2100kg / cm^TwoThe same conditions other than that
Was pulverized and classified. As a result, the particle size is 11.55 μm
(Σ 2.03 μm) and then flattened by subsequent classification
Particles having a uniform particle diameter of 10 μm were obtained. The same method as in Example 1
The average of the thickness of the end face / the thickness of the central part of the layer face obtained in
Containing particles having a thickness / thickness at the center of the layer surface of 0.9 to 1.0
The amount and the gloss value of the powder are shown in Table 1.

[0025]Example 4 10% suspension of natural talc with an initial average particle size of 32.15 μm
The liquid was pulverized and classified under the same conditions as in Example 1. That conclusion
Fruit, crushed to a particle size of 12.16 μm (σ 1.76 μm)
Then, by classification, particles having an average particle diameter of 13 μm are obtained.
It was End face thickness / layer face center obtained by the same method as in Example 1
The average of the thickness of the part and the thickness of the end face / the thickness of the central part of the layer surface are
The particle content of 0.9 to 1.0 and the gloss value of the powder are displayed.
Shown in 1.

[0026]Example 5 1 of synthetic fluorophlogopite with an initial average particle size of 36.05 μm
Jet Mill Gena made by Genus Corporation with 0% suspension
It was pulverized using a PYPRE03-15 type. Grinding conditions
Is a differential pressure of 2200 kg / cm^Two, Flow rate per minute 0.30 lit
Le Genus PY unit
The jet streams to collide with each other for atomization.
Process). As a result, the particle size is 14.87 μm (σ1.
80 μm) and then classified to obtain an average particle size
13 μm particles were obtained. Edge obtained by the same method as in Example 1
Surface thickness / layer Average of center surface thickness and end face thickness / layer
Content of particles having a thickness of 0.9 to 1.0 in the center of the plane, and
The gloss value of the powder is shown in Table 1.

[0027]Example 6 A 20% suspension of synthetic fluorophlogopite similar to that in Example 5 was ground.
Condition only 350kg / cm^TwoAnd other conditions are as in Example 5.
Grinding and classification were performed in the same manner. As a result, the particle size is 27.1.
It is crushed to 8 μm (σ1.55 μm) and then classified.
Thus, particles having an average particle diameter of 25 μm were obtained. The treated particles
It was observed with a scanning electron microscope. Figure 4 shows a representative photograph
((A) surface direction, (B) end surface direction) and Example 1
Average of end face thickness / layer center thickness obtained by the same method
And the thickness of the end face / the thickness of the central part of the layer face is 0.9 to 1.0
Table 1 shows the content of the particles and the gloss value of the powder.

[0028]Comparative Example 1 A synthetic fluorine phlogopite 10% suspension 1 liter similar to that of Example 1
The tor was crushed using a ball mill for 6 hours. That
As a result, it was crushed to a particle size of 11.98 μm (σ 4.36 μm).
And then classify to obtain particles with an average particle size of 11 μm.
It was The treated particles were observed with a scanning electron microscope. That copy
The true is shown in Fig. 5 ((A) surface direction, (B) end surface direction) and again
Thickness of end face / thickness of central part of layer face obtained by the same method as in Example 1
Average and the thickness of the end face / thickness of the center of the layer face is 0.9 to
The particle content of 1.0 and the gloss value of the powder are shown in Table 1.
You

[0029]Comparative example 2 1 liter of 10% natural talc suspension as in Example 4
It pulverized for 6 hours using a ball mill. as a result,
Particle size 10.12 μm (σ3.92 μm)
Particles having an average particle diameter of 11 μm were obtained by the subsequent classification. Fruit
Thickness of end face / thickness of central part of layer face obtained by the same method as in Example 1
Average and the thickness of the end face / thickness of the center of the layer face is 0.9 to
The particle content of 1.0 and the gloss value of the powder are shown in Table 1.
You .

[0030]Comparative Example 3 The synthesized plate-like aluminum powder was treated under the same conditions as in Comparative Example 1.
Crushed with. As a result, the particle size is 23 μm (σ3.36 μ
m) and then classified to have an average particle size of 25μ
m particles were obtained. Thickness of end face obtained by the same method as in Example 1
Average / thickness of center of layer surface and thickness of end face / center of layer surface
Content of particles having a thickness of 0.9 to 1.0, and
The gloss values are shown in Table 1.

[0031]

[Table 1]           Edge thickness (A) Central thickness (B) A / B content Gloss value(Average value, μm) (Average value, μm) (%) Example 1 0.09 0.10 0.90 60 3.0 Example 2 0.25 0.27 0.93 70 2.9 Example 3 0.41 0.44 0.93 80 3.3 Example 4 0.55 0.58 0.94 65 3.2 Example 5 0.21 0.22 0.95 70 3.1 Example 6 0.48 0.50 0.96 60 3.4 Comparative Example 1 0.38 0.98 0.38 55 4.0 Comparative Example 2 0.46 0.94 0.49 40 3.7Comparative Example 3 0.25 0.40 0.62 58 5.2

As is clear from the results shown in Table 1, the smoothness of Examples 1 to 6 is 40 to 50% higher than that of Comparative Examples 1 to 2, and the thickness of the end face / the thickness of the central portion of the layer face is It contains 60% or more of a plate-like compound of 0.9 to 1.0. At the same time, the gloss value is 3.5 or less, which is low gloss. Also, in the scanning electron micrographs of Example 1 and Example 6 shown in FIGS. 3 and 4, there is almost no unevenness on the end face as seen in the scanning electron micrograph of Comparative Example 1 shown in FIG. can not see.

Further, comparing the value of σ (dispersion) of Examples 1 to 6 before classification with that of Comparative Examples 1 to 3, Example 1
It can be seen that the value of σ of ˜6 is small and the variation in particle size is small. That is, it is understood that the plate-like crystal compound powder obtained by the production method of the present invention has an improved yield in a certain particle size range.

[0034]Example 7 The same synthetic fluorophlogopite as in Example 1 was used as in Example 1.
It was crushed and classified under the conditions. The synthetic fluorophlogopite obtained is
After collecting with a filter press, put it in the dryer 3
It was dried at 00 ° C. Crush dried synthetic phlogopite
Then, heat treatment was performed at 1000 ° C. for 1 hour to obtain a sample. F
The elution amount of fluorine can be evaluated according to the
The method below is based on the "Narushin Mica Severe Dissolution Test Method".
Then, a fluorine elution amount test was conducted. The results are shown in Table 2.
You

<Severe dissolution test method> 5 g of product and 10 distilled water
0 ml was placed in the flask and heated under reflux for 1 hour. After cooling, it was filtered with a filter paper and a membrane filter. The whole amount of the filtrate was distilled according to the fluorine test method to prepare a test solution. Subsequent fluorine analysis was performed by absorptiometry using lanthanum-alizarin complexone. In addition, the standard value of the allowable fluorine elution amount is 20 ppm or less.

[0036]Example 8 The same synthetic fluorophlogopite as in Example 2 was used as in Example 2.
It was crushed and classified under the conditions. The synthetic fluorophlogopite obtained is
After collecting with a filter press, put it in the dryer 3
It was dried at 00 ° C. Crush dried synthetic phlogopite
Then, heat treatment was performed at 1000 ° C. for 1 hour to obtain a sample. F
The elution amount of fluorine was evaluated in the same manner as in Example 7. Table of results
2 shows.

[0037]Example 9 The same synthetic fluorophlogopite as in Example 3 was used as in Example 3.
It was crushed and classified under the conditions. The synthetic fluorophlogopite obtained is
After collecting with a filter press, put it in the dryer 3
It was dried at 00 ° C. Crush dried synthetic phlogopite
Then, heat treatment was performed at 1000 ° C. for 1 hour to obtain a sample. F
The elution amount of fluorine was evaluated in the same manner as in Example 7. Table of results
2 shows.

[0038]Comparative Example 4 A synthetic fluorine phlogopite 10% suspension 1 liter similar to that of Example 1
The tor was crushed using a ball mill for 6 hours. That
As a result, the particle size was pulverized to 11.98 μm (σ 4.36 μm)
And then classify particles with an average particle size of 10 μm
Obtained. The fluorophlogopite is collected by a filter press
After that, it was placed in a dryer and dried at 300 ° C. Dried
Synthetic Fluor phlogopite was crushed and heat-treated at 1000 ° C for 1 hour.
A sample was obtained by applying processing. Example 7 was used to evaluate the amount of fluorine elution.
I went the same way. The results are shown in Table 2.

[0039]Comparative Example 5 A synthetic fluorine phlogopite 10% suspension 1 liter similar to that of Example 1
The tor was crushed using a ball mill for 6 hours. So
As a result, crushed to a particle size of 11.98 μm (σ 4.36 μm)
Then, by classification, particles with an average particle size of 13 μm
Obtained. The fluorophlogopite is collected by a filter press
After that, it was placed in a dryer and dried at 300 ° C. Dried
Crush synthetic synthetic phlogopite and heat at 1000 ℃ for 24 hours
After the treatment, the synthetic fluorophlogopite was not sintered.
It was After roughly crushing the sintered body with a hammer,
It was crushed and used to obtain a sample. The sample was vitrified
As a result, the glossiness peculiar to synthetic fluorine phlogopite has disappeared.
Evaluation of the fluorine elution amount was performed in the same manner as in Example 7. The result
It shows in Table 2.

[0040]Comparative Example 6 1 kg of synthetic fluorophlogopite as in Example 1 was sampled.
It was crushed using a mill. As a result, the particle size is 13.12 μm
(Σ 4.75 μm) and then flattened by subsequent classification
Particles having a uniform particle diameter of 11 μm were obtained. Electric Fluoro phlogopite
It was placed in a furnace and baked at 1000 ° C. for 4 hours. Fluorine dissolution
The evaluation of the output amount was performed in the same manner as in Example 7. The results are shown in Table 2.
You

[0041]

[Table 2]

As is clear from the results shown in Table 2, the fluorine elution amount of each of Examples 7 to 9 was invariable although the particle diameters before and after the treatment were the same in each of the Examples and Comparative Examples. Is also less than 10 ppm, which shows that the amount of fluorine elution is significantly suppressed as compared with Comparative Example 4. Further, it can be seen that the fluorine elution amount is suppressed to about half even when compared with Comparative Example 6. Further, when firing is carried out for a long time in order to reduce the elution amount of fluorine as in Comparative Example 5, the structure is decomposed and synthetic fluorophlogopite is no longer used.

Next, the synthetic foot of Example 1 or Comparative Example 1 was used.
The powdery foundation of the following prescription using elemental mica
Were prepared by conventional methods. Fan by panel 10 people
A feeling of use (easiness of application) and application
Regarding the finish (matte feeling) after cloth, the following evaluation criteria
It was evaluated by.Evaluation criteria ◯: When the synthetic fluorophlogopite of Example 1 was used (Example
10) is the case where the synthetic fluorophlogopite of Comparative Example 1 is used.
Ease of application and matt feeling compared to the case of Comparative Example 7
More than 8 panelists answered that they were excellent. X: When the synthetic fluorophlogopite of Example 1 was used (Example
10) is the case where the synthetic fluorophlogopite of Comparative Example 1 is used.
Ease of application and matt feeling compared to the case of Comparative Example 7
Less than 8 panelists answered excellent. The evaluation results are shown in Table 3.

[0044]

[Table 3]Prescription Example 10 Comparative Example 7 Talc 20 20 Synthetic Fluoro phlogopite (Example 1) 35 − Synthetic Fluor phlogopite (Comparative Example 1) -35 Kaolin 5 5 Titanium dioxide 10 10 Mica titanium 3 3 Zinc stearate 11 Bengal 1 1 Yellow iron oxide 33 Black iron oxide 0.2 0.2 Nylon powder 10 10 Squalane 6 6 Lanolin acetate 11 myristin Acid Octyl Tedecyl 222 Diisooctane Acid neopentyl glycol 2 2 Sorbitan monooleate 0.5 0.5 Preservative Suitable amount Suitable amount Antioxidant Proper amount Proper amountPerfume Suitable amount Suitable amount The above comparative evaluation of ease of application and matt feeling: ○

As is clear from the results shown in Table 3, Example 1
When the synthetic fluorine phlogopite is used, the smoothness and low gloss are excellent in application feeling and matte finish of foundation.

[0046]

As described above, according to the plate crystal compound powder and the method for producing the same according to the present invention, a plate compound powder having high smoothness of plate particles and low gloss, and A plate-like synthetic fluoromica powder having high powder safety can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view of a plate crystal compound powder of the present invention.

FIG. 2 is an explanatory view of a conventional plate crystal compound powder.

FIG. 3 is a scanning electron micrograph of plate crystal compound powder obtained by the production method of the present invention.

FIG. 4 is a scanning electron micrograph of a plate-like crystalline compound powder obtained by the production method of the present invention.

FIG. 5 is a scanning electron micrograph of a plate-shaped crystal compound powder obtained by a production method other than the present invention.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeyoshi Hayashi             9 Topy work, 5-4 Yonbancho, Chiyoda-ku, Tokyo             Business F-term (reference) 4C083 AB212 AB232 AB242 AB431                       AB432 AB442 AC022 AC242                       AC352 AC392 AC442 AD072                       AD512 BB26 CC01 CC12                       DD17 EE06 EE07 EE10 FF01                 4G073 BD21 CM22 FD24 FD25 GA34                       UB31

Claims (6)

[Claims] 1. The thickness of the end surface / the thickness of the central portion of the layer surface is 0.9.
A plate-like compound powder containing 60% or more of a plate-like compound having an amount of 1.0. 2. The plate-like compound powder according to claim 1, which has a gloss value of 3.5 or less according to the gloss value measuring method described below. <Measurement method of gloss value> About 5-6 cm on white cardboard
Stick the double-sided tape cut to the length of. Cellotape (registered trademark) cut into about 5-6 cm on double-sided tape
, With the adhesive side facing up, between the double-sided tape and cellophane tape so that air does not enter. Put excess powder on top of cellophane tape, then use a brush for cosmetics in the same direction 10
Acclimate. Brush off excess powder on the cellophane tape and on the brush, and apply it 10 times in the same direction with a brush. It is measured with a gloss meter (“VG-2PD” manufactured by Nippon Denshoku Industries Co., Ltd.) so that incident light → reflection occurs in a familiar direction. The incident-reflection angle is 60 ° -60 °. In addition,
Make sure to adjust the zero point and span of the gloss meter once for each series of measurements and before measurement. For the adjustment of the span, a reflector having a gloss value of 89 is used. 3. The fluorine elution amount in water according to the severe elution test method is less than 10 ppm.
Or the plate-like synthetic fluoromica powder according to 2. 4. A cosmetic containing the plate-like compound powder according to claim 1. 5. A method for producing a plate-shaped compound powder, comprising a pulverization step of pulverizing a raw material plate-shaped compound powder using a high-pressure homogenizer at a differential pressure of 100 kg / cm ² or more. 6. A pulverization step of pulverizing a raw material plate-like synthetic fluoromica powder using a high-pressure homogenizer at a differential pressure of 100 kg / cm ² or more, and 500 to 1 after the pulverization step.
A method for producing a plate-like synthetic fluoromica powder, comprising a heat treatment step of heat treatment at 200 ° C.