ORGANIC-SOLVENT DISPERSION OF FINE POLYSILSESQUIOXANE PARTICLE, PROCESS FOR PRODUCING THE SAME, AQUEOUS DISPERSION OF FINE POLYSILSESQUIOXANE PARTICLE, AND PROCESS FOR PRODUCING THE SAME

摘要

An organic-solvent dispersion containing fine polysilsesquioxane particles stably dispersed therein, which is obtained by regulating the pH of an aqueous dispersion of fine polysilsesquioxane particles to 2-9, subsequently adding an organic solvent thereto, and then removing the water from the system; and an aqueous dispersion of fine polysilsesquioxane particles having an appropriate average particle diameter, which is obtained by regulating the amount of a base catalyst to be used so as to be in a specific range. The process for producing an organic-solvent dispersion of fine polysilsesquioxane particles is characterized by displacing the water in an aqueous fine-polysilsesquioxane-particle dispersion having a pH of 2-9 with an organic solvent. The process for producing an aqueous dispersion of fine polysilsesquioxane particles having an average particle diameter of 1-40 nm comprises mixing a dispersion stabilizer, a base catalyst, and a trialkoxysilane in the presence of an aqueous solvent to produce an aqueous dispersion of fine polysilsesquioxane particles, and is characterized in that the base catalyst is used in an amount of 4-45 mmol per L of the whole aqueous solvent.