SILICA PARTICLES, METHOD FOR PRODUCING SAME, AND RESIN COMPOSITION

摘要

Provided is a method for producing novel silica particles. In the production of silica particles by reaction of silicon-containing particles with oxygen, a metal element having a smaller electron affinity than the silicon element is comprised, consequently the reaction of silicon-containing particles with oxygen is controlled and therefore the temperature increase during the reaction is accordingly controlled. As a result, voids are hardly formed inside the resulting silica particles due to the relatively gentle reaction condition when forming the silica particles. The silica particles obtained by reaction of silicon-containing particles mainly comprising metal silicon with oxygen are characterized in that the silicon-containing particles are each an alloy or intermetallic compound including a reaction controlling element which comprises an iron element, a phosphorous element and an aluminium element, and at least some portion of the primary particles constituting the particles include both a silicon element and the above-mentioned reaction controlling element.