Patent ID: 9656874
Date: 2017-05-23
CPC Classifications: B01J,C01B,C01F,C01G,C01P,Y10T

Claim:
1. A method for producing particles containing a metal oxide, the method comprising the steps of: feeding a metal oxide sol having a pH of 7 or higher and containing metal oxide colloidal particles as dispersoids and water as a dispersion medium, into a liquid containing a solvent a) that is a protic solvent having a relative permittivity of 30 or lower at 20° C. and having a solubility in 20° C. water of 0.05 g/100 ml or more, or b) that is an aprotic solvent having a relative permittivity of 40 or lower at 20° C. and having a solubility in 20° C. water of 0.05 g/100 ml or more, and thereby forming aggregates of the metal oxide colloidal particles in the liquid; and subjecting the aggregates to at least one treatment selected from drying, heating, and pressurization, to increase a binding force between the metal oxide colloidal particles constituting the aggregates, and thereby converting the aggregates into particles that are insoluble in water.