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Silicone fine particles and production method thereof

A technology of organosilicon and microparticles, applied in chemical instruments and methods, medical preparations containing active ingredients, inorganic chemistry, etc., can solve the problem of not being able to provide soft texture

Inactive Publication Date: 2013-05-29
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyorganosilsesquioxane microparticles contain a resinous hard material and it does not provide a soft texture

Method used

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  • Silicone fine particles and production method thereof
  • Silicone fine particles and production method thereof
  • Silicone fine particles and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] with 600mm 2 The methyl vinyl polysiloxane represented by the following formula (1) of 500g of / s viscosity and have 30mm 220 g of methylhydrogenpolysiloxane of the following formula (2) with a viscosity per s (the amount is 1.11 hydrosilyl groups (SiH groups) relative to 1 ethylenically unsaturated group, such as a vinyl group) ) into a 1-liter glass beaker, and then the mixture was stirred and dissolved by a homomixer at 2,000 rpm. Next, 3 g of polyoxyethylene lauryl ether (ethylene oxide addition, 9 moles) and 60 g of water were added, and the mixture was stirred at 6,000 rpm by a homomixer to prepare a viscosity-increased oil-in-water emulsion. The mixture was stirred for a further 15 minutes. When 415 g of water were added with stirring at 2,000 rpm, a consistent white emulsion was obtained. This emulsion was transferred to a 1 liter glass flask equipped with a stirring device with an anchored stirring paddle and the temperature adjusted to 15 to 20°C. Under st...

Embodiment 2

[0081] Except that 2.7 g of sodium N-myristoyl sarcosinate (anionic surfactant) was replaced by 0.6 g of sodium N-myristoyl sarcosinate (anionic surfactant) and 2.1 g of sodium lauryl phosphate (anionic surfactant) (in an amount such that a total of 0.1 parts by weight of sodium N-myristoyl sarcosinate and sodium lauryl phosphate is added to 100 parts by weight of water when the base is added as described below), the implementation was repeated The procedure of Example 1 was used to prepare silicone microparticles.

[0082] The obtained silicone fine particles were dispersed in water by using a surfactant, and the volume average particle size measured using "Multisizer 3" (electric resistance method particle size distribution analyzer manufactured by Beckman Coulter) was 6 μm.

[0083] Observing the obtained silicone microparticles using an electron microscope, the microparticles were found to be in the form of spherical silicone elastomer microparticles having spherical polym...

Embodiment 3

[0085] Except that 2.7 g of sodium N-myristoyl sarcosinate (anionic surfactant) was replaced by 9 g of 30% sodium N-lauroylmethylalanine (anionic surfactant) in an amount such that Except adding 0.1 part by weight of sodium N-lauroylmethylalanine relative to 100 parts by weight of water under the alkaline substance), the steps of Example 1 were repeated to prepare silicone particles.

[0086] The obtained silicone fine particles were dispersed in water by using a surfactant, and the volume average particle size measured using "Multisizer 3" (electric resistance method particle size distribution analyzer manufactured by Beckman Coulter) was 5 μm.

[0087] The obtained silicone microparticles were observed using an electron microscope, and the microparticles were found to be in the form of spherical silicone elastomer microparticles having 700 nm-sized polymethylsilsesquioxane hemispheres sparsely attached to their surfaces.

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Abstract

A method for producing silicone fine particles is provided. The particle comprises a spherical fine silicone elastomer particle and polyorganosilsesquioxane particles attached to the surface of the spherical fine silicone elastomer particle. The polyorganosilsesquioxane particle has a particle size of 200 to 2,000 nm which is smaller than the spherical fine silicone elastomer particle. The method comprises the steps of adding an organotrialkoxysilane to water for hydrolysis, and adding spherical fine silicone elastomer particles having a volume average particle size of 0.5 to 100 [mu]m, an anionic surfactant, and an alkaline substance to the organotrialkoxysilane hydrolysate and allowing the mixture to stand to thereby promote condensation of the organotrialkoxysilane hydrolysate so that the polyorganosilsesquioxane is deposited on the surface of the spherical fine silicone elastomer particles.

Description

technical field [0001] The present invention relates to silicone microparticles comprising spherical silicone elastomer microparticles having polyorganosilsesquioxane particles having a particle size of 200 to 2,000 nm deposited thereon. The invention also relates to a process for their preparation. Background technique [0002] Known silicone microparticles include microparticles having rubber elasticity (silicone elastomer microparticles) and microparticles of polyorganosilsesquioxane resins, and these particles have been introduced in cosmetic products for the purpose of providing the product with a dry , smooth, and other texture and spreadability. More particularly, the inventors of the present invention have proposed polyorganosilsesquioxane-coated silicone microparticles in JP-A H07-196815, and these particles have been improved due to their soft texture, reduced coagulation and excellent dispersibility And used in many cosmetic products. [0003] In the method pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/00C08L83/04C08G77/06
CPCC08J3/126C08J2483/04C08J2383/04A61K2800/624A61Q19/00A61K2800/10C08L83/04C08J3/124A61K8/025A61K8/895A61Q1/12A61K8/585A61K8/891A61K2800/654Y10T428/2995B82B1/00B82B3/00C01B33/021C08G77/14
Inventor 井口良范
Owner SHIN ETSU CHEM CO LTD
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