Method for producing inorganic oxide particles

Surface treated inorganic oxide particles having a crush strength of 0.01 to 0.06N, said surface treated inorganic oxide particles being produced by a method comprising:

• coagulating a dispersion obtained by carrying out the hydrolysis reaction and the polycondensation reaction of a metal alkoxide in the presence of a basic catalyst by using of a mixture of water and an alcohol as a solvent;
• filtering the dispersion to obtain particles;
• and
• drying the particles, wherein
• the step of coagulating the dispersion is carried out by adding a coagulant comprising at least one compound selected from the group consisting of carbon dioxide, ammonium carbonate, ammonium hydrogen carbonate and ammonium carbamate to the dispersion,
• wherein surface treatment of the inorganic oxide particles is carried out by adding at least one surface treating agent selected from the group consisting of a silicone oil, a silane coupling agent and a silazane to the dried oxide particles after the drying step;
• and
• the inorganic oxide particles to be produced are surface treated inorganic oxide particles having a crush strength of 0.01 to 0.06N.