METHOD FOR PRODUCING SILICA-BASED PARTICLE DISPERSION, SILICA-BASED PARTICLE DISPERSION, COATING LIQUID FOR FORMING TRANSPARENT COATING FILM, AND SUBSTRATE WITH TRANSPARENT COATING FILM

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a silica-based particle dispersion, which enables production of silica-based hollow particles in a high ratio, having a size such that the average particle diameter is smaller than 50 nm.SOLUTION: Provided is a method for producing a dispersion containing silica-based particles, where the particles have an average particle diameter of 5 to 40 nm and a ratio (hollow ratio) of the number of hollow particles relative to the total number of hollow particles and solid particles is 70% or more. Specifically, the method comprises a first step of preparing a dispersion containing composite oxide particles by simultaneously adding, to a dispersion containing silica nuclear particles having an average particle diameter of 3 to 25 nm and sphericity of 1.0 to 1.5, at least either of an aqueous silicate solution or an acidic silicic acid solution, and an aqueous solution of an inorganic compound.SELECTED DRAWING: Figure 1