Patent ID: 8748552
Filing Date: 2014-06-10
Classification: C08G,C08J

Abstract:
1. A method of preparing polyalkylsilsesquioxane particulates having moisture content of 0.3 to 0.7% and the coefficient of variation (CV) of 12.3 to 23.1%, comprising the following steps: a first step of preparing an alkylsilanetriol represented by Chemical Formula 2 or a partial hydrolysate thereof by hydrolyzing an alkyltrialkoxysilane represented by Chemical Formula 1; a second step of preparing polyalkylsilsesquioxane particulates having silanol groups on their surface by polycondensing the alkylsilanetriol or the partial hydrolysate thereof; and a third step of end-capping the silanol groups with alkyl groups by adding an alkoxytrialkylsilane selected from the group consisting of the compounds represented by Chemical Formula 3 into a suspension of the polyalkylsilsesquioxane particulates having the silanol groups on their surface to prepare the polyalkylsilsesquioxane particulates, wherein R and R R wherein the hydrolysis reaction of the first step is carried out in the presence of one or more organic acids selected from the group consisting of sulfuric acid, formic acid, acetic acid, propionic acid, oxalic acid, and citric acid.