Aqueous dispersion of core/shell-type composite particles with colloidal silica as the cores and with organic polymer as the shells and production method thereof

Abstract

An aqueous dispersion of core/shell type composite particles having colloidal silica as the cores and having an organic polymer as the shells is disclosed, comprising an aqueous dispersion of particles obtained by carring out a reaction operation of coupling reacting (a) colloidal silica and (b) an organoalkoxysilane in an aqueous medium in the presence of a dispersion stabilizer and thereafter polymerizing the coupling reaction product and (c) a vinyl monomer having at least one ethylenically unsaturated group, and further a method for producing the aqueous dispersion is disclosed. The aqueous dispersion has a good dispersion stability, by-produces less polymer sole particles, and a high coating degree of a polymer on the surfaces of the silica particles.

Dependencies are inferred from the claim text.