JP2001226593A - Silicone elastomer spherical powder dispersion and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely manufacture a silicone elastomer spherical powder dispersion which has narrow particle diameter distribution and good slipping ability. SOLUTION: [A] An organpolyosiloxane composition comprising (a) an organopolysiloxane having at least 2 olefinic unsaturated groups in the molecule and (b) an organohydrogen polysiloxane having at least 2 hydrogen atoms each directly bonded to a silicon atom in the molecule, the number of hydrogen directly bonded to the silicon atom of the (b) component per one olefinic unsaturted group of the (a) component being 0.5 to 5, is dispersed in water by the use of a nonionic surface active agent having an HLB of 11.0 to 17.0, followed by curing it with an addition reaction catalyst to produce the objective silicone elastomer spherical powder dispersion having a volume average diameter of 100 to 1,000 μm and its standard deviation of not more than 100 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing a compound having a volume average particle size of 1
00 to 1,000 μm and standard deviation of 100 μm
The present invention relates to the following dispersion of spherical silicone elastomer powder and a method for producing the same.

[0002]

2. Description of the Related Art Various methods for producing a silicone elastomer powder and a method for producing an aqueous dispersion of a silicone elastomer powder have heretofore been proposed. For example, an emulsion is prepared by emulsifying a vinyl group-containing organopolysiloxane and an organohydrogenpolysiloxane having a hydrogen atom (SiH group) bonded to a silicon atom using a surfactant and water, and then preparing a platinum-based catalyst. Addition and curing method (Japanese Unexamined Patent Publication No.
36546, JP-A-62-257939,
Japanese Unexamined Patent Publication (Kokai) No. 3-93834), a method of heating and curing a curable organopolysiloxane in a spray state (Japanese Unexamined Patent Publication (Kokai) No. 59-1984)
No. 68333), an alkenyl group-containing organopolysiloxane, an organohydrogenpolysiloxane having a hydrogen atom bonded to a silicon atom, and a platinum catalyst are emulsified in water at 0 to 25 ° C., and then emulsified in water at 25 ° C. or more. A method of dispersing and curing (JP-A-62-243621, JP-A-63-77942), dispersing an olefin group-containing organopolysiloxane and a mercaptoalkyl group-containing hydrogenpolysiloxane bonded to a silicon atom in water. After curing, a method of curing by irradiation with ultraviolet rays (Japanese Patent Application Laid-Open No. 63-65692), a method of dispersing an amino group-containing organosiloxane and an acrylic functional radical-containing organopolysiloxane in a liquid and then curing the same (Japanese Patent Application Laid-Open No. Sho 63-65692). 63-128075), a silicon-bonded hydroxyl group Yes diorganopolysiloxane, after dispersing the silicon-bonded hydrogen atom-containing organohydrogenpolysiloxane and a curing catalyst in water, a method of curing in contact with the high liquid or gas temperature (JP 63
JP-A-202658), a method in which an acryloxy group, a methacryloxy group or an acrylamide group-containing organopolysiloxane is dispersed in a liquid and cured by ultraviolet irradiation (JP-A-63-25839), a silane compound and a polysiloxane. A method in which the mixture is condensed and cured in a solvent containing a nitrogen-containing aromatic carbocyclic compound as a main component under a condensation catalyst (JP-A-63-212324), a mixture selected from a silane compound and a polysiloxane is treated with an amine, A method of condensing and curing in a solvent containing amide or nitrile as a main component under a condensation catalyst (Japanese Patent Laid-Open No.
JP-A-3-310325), a method of forming an emulsion from an organovinylpolysiloxane, an organohydrogenpolysiloxane and a platinum-based catalyst and then curing the same (JP-A-1-306471), an aliphatic unsaturated group bonded to a silicon atom. And an organopolysiloxane containing a mercapto group in an emulsion, followed by irradiating the emulsion with ultraviolet rays in the presence of a photosensitizer to cure the emulsion (JP-A-3-953).
268) and the like. However, with these methods, it was difficult to obtain spherical particles having a narrow particle size distribution and an average particle size of 100 μm or more.

On the other hand, a method in which a vinyl group-containing organopolysiloxane, an organohydrogenpolysiloxane containing a silicon-bonded hydrogen atom, and a platinum compound are charged into water through a nozzle and then cured in water (Japanese Patent Application Laid-Open No. Sho 61-1986) No. 223032, JP-A-1-17852
No. 3, JP-A-2-6109). With this method, it was difficult to obtain particles having an average particle size of 1,000 μm or less.

Accordingly, a method is described in which an emulsion is prepared from a vinyl group-containing polydiorganosiloxane, an organohydrogenpolysiloxane, a platinum catalyst, a surfactant, silica powder, and water, and then cured by heating (Japanese Patent Laid-Open No. No. 232263), which describes that particles having an average particle size of 50 to 3,000 μm can be obtained. However, the silicone elastomer powders obtained by these methods have a drawback that they contain silica and have poor slipperiness.

The present invention has been made in view of the above circumstances, and a silicone elastomer spherical powder dispersion having a narrow particle size distribution and a volume average particle size of 100 to 1,000 μm, which has solved the above-mentioned disadvantages of the prior art, and its production. The aim is to provide a method.

[0006]

Means for Solving the Problems and Embodiments of the Invention The present inventors have conducted intensive studies in order to achieve the above object. As a result, (a) olefins in one molecule having a viscosity of 1 to 500 cSt at 25 ° C. (B) an organohydrogenpolysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule having a viscosity of 1 to 500 cSt at 25 ° C. A organopolysiloxane composition in which 0.5 to 5 hydrogen atoms bonded to a silicon atom in the component (b) is used for one olefinically unsaturated group in the component (a), The surfactant is dispersed in water using a rotary shearing emulsifying and dispersing machine, and then an addition reaction catalyst is added to harden the organopolysiloxane composition. By the volume average particle size is and the standard deviation is 100～1,000Myuemu 10
It has been found that a dispersion of a silicone elastomer spherical powder having a narrow particle size distribution of 0 μm or less can be obtained easily and reliably, and since it does not contain silica, it has good slipperiness, and has led to the present invention.

Accordingly, the present invention relates to [A] an organopolysiloxane composition comprising the above components (a) and (b), and [B] a polyoxyethylene castor oil having an HLB of 11.0 to 17.0. , Polyoxyethylene hydrogenated castor oil, polyoxyethylene hydrogenated castor oil fatty acid ester,
A nonionic surfactant selected from polyglycerin fatty acid ester and polyoxyethylene glycerin fatty acid ester is dispersed in water and cured by an addition reaction catalyst. 2,000 μm and standard deviation of 100 μm
m or less, and the organopolysiloxane composition comprising the above components (a) and (b) in an aqueous solution of the above nonionic surfactant by using a rotary shearing type emulsifying disperser. And then adding an addition reaction catalyst to cure the organopolysiloxane composition, and to provide a method for producing the silicone elastomer spherical powder dispersion.

Here, the standard deviation is the square root of the degree of dispersion, which is the average of the square of the volume average particle diameter and the deviation, and this value becomes smaller when the particle size distribution is narrow.

Hereinafter, the present invention will be described in more detail.
The component (a) used in the organopolysiloxane composition of the component (A) of the present invention has a viscosity at 25C of from 1 to 500.
cSt is an organopolysiloxane containing at least two olefinically unsaturated groups in one molecule, and can be represented by the following average composition formula (1). R ¹ _a R ² _b SiO _{(4-ab) / 2} (1)

Here, R ¹ in the above formula (1) is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms which does not contain an aliphatic unsaturated bond, such as methyl, ethyl, propyl, Alkyl groups such as butyl, pentyl, hexyl, octyl, decyl, dodecyl, tetradecyl, hexadecyl, octadecyl, eicosyl, cyclopentyl,
Examples thereof include cycloalkyl groups such as cyclohexyl, aryl groups such as phenyl and tolyl, and those in which some or all of the hydrogen atoms in these groups have been substituted with halogen atoms, cyano groups, or the like. Preferably, it is a methyl group.

R ² is a monovalent olefinically unsaturated group having 2 to 6 carbon atoms (alkenyl group), for example, vinyl, allyl, propenyl, butenyl, pentenyl, hexenyl and the like. Is preferred.

A and b are 0 ≦ a ≦ 2.999, 0.00
It is a positive number represented by 01 ≦ b ≦ 3, 0.1 ≦ a + b ≦ 3, preferably 0 ≦ a ≦ 2.295, 0.005 ≦ b ≦
2.3, 0.5 ≦ a + b ≦ 2.3.

If the viscosity at 25 ° C. of the organopolysiloxane having an olefinically unsaturated group is less than 1 cSt, the curability becomes insufficient, and if it exceeds 500 cSt, particles having a narrow distribution cannot be obtained. From 1 to 500 cSt, preferably from 5 to 50 cSt.
0 cSt.

The structure of the organopolysiloxane having an olefinically unsaturated group may be linear, cyclic, or branched, but is preferably a linear one. Its terminal is usually blocked with a triorganosilyl group.

On the other hand, the component (b) used in the organopolysiloxane composition of the component (A) of the present invention comprises a hydrogen atom (SiH group) bonded to a silicon atom in one molecule having a viscosity at 25 ° C. of 1 to 500 cSt. Is an organohydrogenpolysiloxane having at least two of the above, and can be represented by the following average composition formula (2). R ³ _{c Hd} SiO _{(4-cd) / 2} (2)

Here, R ³ in the above formula (2) is the same as R ¹ . c and d are 0 ≦ c ≦ 2.999, 0.00
It is a positive number represented by 01 ≦ d ≦ 3, 0.1 ≦ c + d ≦ 3, preferably 0 ≦ c ≦ 2.295, 0.005 ≦ d ≦
2.3, 0.5 ≦ c + d ≦ 2.3.

If the viscosity at 25 ° C. of the organohydrogenpolysiloxane is less than 1 cSt, the curability becomes insufficient, and if it exceeds 500 cSt, particles having a narrow distribution cannot be obtained.
St, preferably 5 to 300 cSt.

The structure of the organohydrogenpolysiloxane may be linear, cyclic, or branched, but is preferably a linear one.

The organohydrogenpolysiloxane of the present invention must contain at least two or more hydrogen atoms bonded to silicon atoms in one molecule, and preferably three or more hydrogen atoms.

The amount of the organohydrogenpolysiloxane used is such that a hydrogen atom bonded to a silicon atom is added to one olefinically unsaturated group of the organopolysiloxane having an olefinically unsaturated group as the component (a). 0.
If the amount is less than 5, it is difficult to obtain good curability. If the amount exceeds 5 hydrogen atoms, the physical properties of the cured rubber are reduced. A use amount of five is preferred.

In the present invention, first, a nonionic surfactant [B] is added to an organopolysiloxane composition [A] comprising the above-mentioned organopolysiloxane (a) having an olefinically unsaturated group and an organohydrogenpolysiloxane (b). ], And dispersed in water using a rotary shearing type emulsifying and dispersing machine to prepare an emulsion.

In this case, the content of the organopolysiloxane composition [A] in the emulsion is 10% by weight.
If it is less than 80% by weight, particles with a narrow distribution cannot be obtained.
The content is preferably in the range of 80 to 80% by weight, more preferably 30 to 65% by weight.

The nonionic surfactant (B) used in the present invention includes polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil and polyoxyethylene hydrogenated castor oil fatty acid having an HLB of 11.0 to 17.0. ester,
They are selected from polyglycerin fatty acid esters and polyoxyethylene glycerin fatty acid esters.

Here, specific examples of polyoxyethylene hydrogenated castor oil fatty acid ester include polyoxyethylene hydrogenated castor oil monolaurate, polyoxyethylene hydrogenated castor monostearate, and polyoxyethylene hydrogenated castor tristearate. Specific examples of polyglycerin fatty acid esters include diglyceryl monostearate, diglyceryl monooleate, diglyceryl dioleate, tetraglyceryl monostearate,
Tetraglyceryl monooleate, hexaglyceryl monolaurate, hexaglyceryl monomyristate, hexaglyceryl monostearate, hexaglyceryl monooleate, hexaglyceryl tristearate, decaglyceryl monolaurate, decaglyceryl monomyristate, deca monostearate Glyceryl, decaglyceryl monooleate, decaglyceryl monolinoleate, decaglyceryl distearate, decaglyceryl tristearate, decaglyceryl trioleate, and the like.Specific examples of polyoxyethylene glycerin fatty acid esters include monostearic acid. Polyoxyethylene glyceryl, polyoxyethylene glyceryl monooleate, polyoxyethylene glyceryl distearate, tristearic acid Polyoxyethylene glyceryl,
And polyoxyethylene glyceryl trioleate. One of these nonionic surfactants can be used alone, or two or more can be used in combination.

The average HLB of the nonionic surfactant is 1
If it is less than 1.0 or more than 17.0, particles having a narrow distribution cannot be obtained, so that it is necessary to be 11.0 to 17.0, preferably 12.0 to 16.0.
Range.

When the amount of the nonionic surfactant of the present invention is less than 0.01% by weight, particles having a narrow distribution cannot be obtained, and when it exceeds 5% by weight, the volume average particle diameter becomes 10%.
0 μm or more can no longer be used.
The content is preferably in the range of 5% by weight, more preferably 0.1 to 3% by weight.

The emulsification is performed by a stirrer such as a propeller mixer and a disk turbine, a rotary centrifugal radiation type stirrer such as a homodisper, a grinding type dispersion emulsifier such as a mass colloider, a high-pressure injection nozzle type emulsification disperser, a colloid mill, a homogenizer. And the like, the volume average particle size of the object of the present invention is 10
It is difficult to set the standard deviation to 0 to 1,000 μm and the standard deviation to 100 μm or less. It is preferably a rotary shearing type emulsifying and dispersing machine comprising a turbine such as a homomixer and a stator.

The appropriate rotation speed of the rotary shearing type emulsifying and dispersing machine differs depending on the size thereof, and is not specifically shown. However, in order to make the volume average particle size in the range of 100 to 1,000 μm, Need to do, quite slow.

According to the present invention, an aqueous dispersion of a mixture of an organopolysiloxane having an olefinically unsaturated group and an organohydrogenpolysiloxane (organopolysiloxane composition) is prepared, and an addition reaction catalyst is added to the mixture to prepare a polysiloxane mixture. To cure.

The addition reaction catalyst is not particularly limited, but various platinum compounds, palladium compounds and the like can be used. Among them, platinum compounds are preferred,
Examples thereof include chloroplatinic acid, complexes with olefins, complexes with vinylsiloxanes, and modified alcohols. The addition amount of the platinum compound is a catalytic amount, and particularly when the addition amount of the platinum compound is less than 1 ppm with respect to the total amount of the organopolysiloxane having an olefinically unsaturated group and the organohydrogenpolysiloxane, the addition reaction rate is small. It is uneconomical to exceed 100 ppm, so 1 to 100 ppm is preferable.

In order to accelerate the addition reaction or to complete the addition reaction, the dispersion may be heated at 100 ° C. or lower after the addition reaction catalyst is added.

The dispersion of the silicone elastomer spherical powder of the present invention produced as described above can be used as it is or after being appropriately diluted with water and added to an aqueous material.

In order to obtain silicone elastomer spherical powder, solid-liquid separation and drying may be further performed.

The silicone elastomer spherical powder in the dispersion of the present invention has a volume average particle size of 100 to 1,
000 μm, preferably 100-500 μm
m, more preferably 100 to 300 μm. Also,
The standard deviation is 100 μm or less, particularly 85 μm or less. According to the present invention, spherical powder of silicone elastomer having the above-mentioned volume average particle size and narrow particle size distribution can be obtained efficiently and reliably. The volume average particle diameter and the standard deviation can be adjusted by adjusting the amount and type of the nonionic surfactant as the component (B), the amount of water, the selection and conditions of the emulsifier, the time, and the like.

[0035]

EXAMPLES The present invention will be described below in detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples. In addition, the viscosity in an Example is a measured value at 25 degreeC.

Example 1 430 g of methylvinylpolysiloxane having a viscosity of 60 cSt represented by the following formula (3) and 73 g of methylhydrogenpolysiloxane having a viscosity of 25 cSt represented by the following formula (4) ([Si-H / Vinyl group] molar ratio = 1.19) into a glass beaker having a capacity of 1 liter and using a homomixer at 2,000 rpm.
After stirring and mixing with decaglyceryl monolaurate (H
(LB = 15.5) A mixed solution of 10 g and 483 g of water was added, and the mixture was stirred at 1,500 rpm for 20 minutes. The obtained aqueous dispersion of the polysiloxane mixture was transferred to a glass flask equipped with a plate stirrer, and stirred at room temperature under stirring with a toluene solution of chloroplatinic acid-olefin complex (chloroplatinic acid content: 0.5% by weight). A mixed solution of .2 g and 2.4 g of polyoxyethylene (additional mole number 9) lauryl ether was added, reacted for 24 hours, passed through a 16-mesh wire net, and dispersed in an aqueous dispersion (dispersion) of a cured polysiloxane.
I got This dispersion is used as a particle size analyzer Multisizer II.
When the particle size of the cured polysiloxane was measured with a Beckman Coulter Co., Ltd., the volume average particle size was 160.
In μm, the standard deviation was 47 μm. Further, the obtained aqueous dispersion of the cured polysiloxane was subjected to solid-liquid separation using a filter paper, and the solid content was dried with a dryer at 105 ° C.
An elastic white powder was obtained. Observation of this white powder with an optical microscope revealed spherical particles.

[0037]

Embedded image

Example 2 10 g of decaglyceryl monolaurate used in Example 1 was added to polyoxyethylene (additional mole number 20) glyceryl monooleate (HLB = 1).
4.5) In the same manner as in Example 1 except that the amount was 10 g,
An aqueous dispersion of a cured polysiloxane, and further, an elastic white powder were obtained. Table 1 shows the volume average particle size, standard deviation, and shape measurement results.

Example 3 10 g of decaglyceryl monolaurate used in Example 1 was added to polyoxyethylene (additional mole number: 60) hydrogenated castor oil monolaurate (HLB =
13.9) An aqueous dispersion of a cured polysiloxane, and an elastic white powder were obtained in the same manner as in Example 1 except that the amount was changed to 10 g. Table 1 shows the volume average particle size, standard deviation, and shape measurement results.

Example 4 10 g of decaglyceryl monolaurate used in Example 1 was added to polyoxyethylene (additional mole number: 60) hydrogenated castor oil (HLB = 14.0) 10
An aqueous dispersion of a cured polysiloxane, and an elastic white powder were obtained in the same manner as in Example 1 except that g was used. Table 1 shows the volume average particle size, standard deviation, and shape measurement results.

Example 5 The procedure of Example 1 was repeated, except that 10 g of decaglyceryl monolaurate used in Example 1 was replaced with 10 g of polyoxyethylene (additional mole number: 60) castor oil (HLB = 14.0). As a result, an aqueous dispersion of a cured polysiloxane, and further, an elastic white powder were obtained. Table 1 shows the volume average particle size, standard deviation, and shape measurement results.

Embodiment 6 Formula (3) used in Embodiment 1
430 g of methylvinylpolysiloxane having a viscosity of 60 cSt and 73 g of methylhydrogenpolysiloxane having a viscosity of 25 cSt represented by the formula (4) are converted into 455 g of methylvinylpolysiloxane having a viscosity of 100 cSt represented by the following formula (5). The viscosity indicated by (4) is 25
48 g of methyl hydrogen polysiloxane of cSt
An aqueous dispersion of a cured polysiloxane, and an elastic white powder were obtained in the same manner as in Example 1 except that the molar ratio ([Si-H / vinyl group] = 1.18) was used. Table 1 shows the volume average particle size, standard deviation, and shape measurement results.

[0043]

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Comparative Example 1 481 g of methylvinylpolysiloxane having a viscosity of 600 cSt represented by the following formula (6)
And 19 g of methylhydrogenpolysiloxane having a viscosity of 25 cSt ([Si-H / vinyl group] molar ratio = 1.12) represented by the formula (4) were charged into a glass beaker having a capacity of 1 liter, and the mixture was treated with a homomixer. 2,000rpm
After stirring and mixing with decaglyceryl monolaurate (H
(LB = 15.5) A mixed solution of 10 g and 488 g of water was added, and the mixture was stirred at 1,500 ppm for 20 minutes. The obtained aqueous dispersion of the polysiloxane mixture was transferred to a glass flask equipped with a flat plate stirrer, and stirred at room temperature with a toluene solution of a chloroplatinic acid-olefin complex (chloroplatinic acid content: 0.5% by weight). A mixed solution of 0.8 g and 1.6 g of polyoxyethylene (additional mole number 9) lauryl ether was added, reacted for 24 hours, and passed through a 16-mesh wire net to obtain an aqueous dispersion of a cured polysiloxane. Further, the obtained aqueous dispersion of the cured polysiloxane was subjected to solid-liquid separation using filter paper, and the solid content was dried by a dryer at 105 ° C., whereby an elastic white powder was obtained. Table 1 shows the volume average particle size, standard deviation, and shape measurement results.

[0045]

Embedded image

Comparative Example 2 10 g of decaglyceryl monolaurate used in Example 1 was added to polyoxyethylene (additional number of moles: 9) lauryl ether (HLB = 14.5) 1
An aqueous dispersion of a cured polysiloxane, and an elastic white powder were obtained in the same manner as in Example 1 except that the amount was 0 g. Table 1 shows the volume average particle size, standard deviation, and shape measurement results.

Comparative Example 3 10 g of decaglyceryl monolaurate used in Example 1 was added to polyoxyethylene (additional mole number: 7.5) nonylphenyl ether (HLB = 1).
4.0) In the same manner as in Example 1 except that the amount was 10 g,
An aqueous dispersion of a cured polysiloxane, and further, an elastic white powder were obtained. Table 1 shows the volume average particle size, standard deviation, and shape measurement results.

Comparative Example 4 10 g of decaglyceryl monolaurate used in Example 1 was added to polyoxyethylene (additional mole number: 20) sorbitan monostearate (HLB =
14.9) An aqueous dispersion of a cured polysiloxane, and an elastic white powder were obtained in the same manner as in Example 1 except that the amount was changed to 10 g. Table 1 shows the volume average particle size, standard deviation, and shape measurement results.

[0049]

[Table 1]

* Surfactant used when preparing aqueous dispersion of polysiloxane Surfactant A: decaglyceryl monolaurate (HLB)
= 15.5) Surfactant B: polyoxyethylene (additional mole number 20)
Glyceryl monoisooleate (HLB = 14.5) Surfactant C: polyoxyethylene (additional mole number 60)
Hardened castor oil monolaurate (HLB = 13.9) Surfactant D: polyoxyethylene (additional mole number 60)
Hardened castor oil (HLB = 14.0) Surfactant E: polyoxyethylene (additional mole number 60)
Castor oil (HLB = 14.0) Surfactant F: polyoxyethylene (additional mole number 9) Lauryl ether (HLB = 14.5) Surfactant G: polyoxyethylene (additional mole number 7.
5) Nonylphenyl ether (HLB = 14.0) Surfactant H: polyoxyethylene (additional mole number 20)
Sorbitan monostearate (HLB = 14.9)

[0051]

According to the present invention, a dispersion of a silicone elastomer spherical powder having a narrow particle size distribution, a volume average particle size of 100 to 1,000 μm, and good slipperiness can be easily and reliably produced. Can be.

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Claims (2)

[Claims] 1. (A) (a) The viscosity at 25 ° C. is 1 to
An organopolysiloxane having at least two olefinically unsaturated groups in one molecule of 500 cSt, (b)
An organohydrogenpolysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule having a viscosity at 25 ° C. of 1 to 500 cSt,
(B) for one olefinically unsaturated group of component (a)
[B] a polyoxyethylene castor oil having a HLB of 11.0 to 17.0, a polyoxyethylene cured castor, and an organopolysiloxane composition having 0.5 to 5 hydrogen atoms bonded to silicon atoms as a component. Oil, polyoxyethylene hydrogenated castor oil fatty acid ester, polyglycerin fatty acid ester and polyoxyethylene glycerin fatty acid ester, obtained by dispersing in water using a nonionic surfactant selected and curing this with an addition reaction catalyst. Volume average particle diameter of 100 to 1,000
Dispersion of silicone elastomer spherical powder having a diameter of μm and a standard deviation of 100 μm or less. 2. A rotary shearing type emulsifying and dispersing machine, wherein the organopolysiloxane composition [A] comprising the components (a) and (b) according to claim 1 is added to an aqueous solution of the nonionic surfactant of the component [B]. 2. The method for producing a silicone elastomer spherical powder dispersion according to claim 1, wherein the organopolysiloxane composition is cured by adding and dispersing the organopolysiloxane composition.