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Title:
METHOD FOR PRODUCING SPHERICAL POLYMETHYLPHENYLSILSESQUIOXANE PARTICLES
Document Type and Number:
WIPO Patent Application WO/2017/135045
Kind Code:
A1
Abstract:
This method for producing spherical polymethylphenylsilsesquioxane particles having a volume average particle size of 1-5 μm, includes: (i) a step for adding methyltrimethoxysilane to water having a pH of 4.0-7.0, and allowing the solution to undergo a hydrolysis reaction, to obtain a transparent aqueous solution; (ii) a step for adding phenyltrimethoxysilane to the aqueous solution obtained in step (i), and allowing the solution to undergo a hydrolysis reaction, to obtain a transparent aqueous silane solution; (iii) a step for adjusting the temperature of the aqueous solution obtained in step (ii) to 0-15°C, adding, to the aqueous solution, an alkaline substance or an aqueous solution in which the alkaline substance is dissolved, and stirring and mixing the solution, to obtain a mixture solution; and (iv) a step for allowing the mixture solution obtained in step (iii) to stand still so that polymethylphenylsilsesquioxane particles precipitate.

Inventors:
INOKUCHI YOSHINORI (JP)
Application Number:
PCT/JP2017/001700
Publication Date:
August 10, 2017
Filing Date:
January 19, 2017
Export Citation:
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Assignee:
SHIN-ETSU CHEMICAL CO LTD (JP)
International Classes:
C08G77/06
Domestic Patent References:
WO2008047654A12008-04-24
Foreign References:
JP2003335860A2003-11-28
JP2000345044A2000-12-12
JPH04202325A1992-07-23
Attorney, Agent or Firm:
PATENT PROFESSIONAL CORPORATION EI-MEI PATENT OFFICE (JP)
Patent business corporation Hideaki international patent firm (JP)
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