Polymer particle coated with silica, method for producing the same and use of the same

摘要

A polymer particle coated with silica comprising: a polymer particle derived from a polymerizable vinyl-based monomer; and a silica film covering the polymer particle, which makes a surface of the polymer particle expose so that an aperture ratio of 0.1 to 1 is possessed and a height h of the silica film and a diameter D of the polymer particle coated with silica have a relationship of 0.5<=h/D<1, wherein the silica film includes a polyalkoxysiloxane oligomer condensate.