Metal oxide particles having core/shell structure having uniform particle size distribution, and method for producing same

Abstract

Core/shell-type metal oxide particles are suitably used for optical thin film, such as a hard coat, ultraviolet blocking layer, anti-reflection film or diffractive optical element material, have excellent light resistance, transparency and processing properties, e.g. imprinting, and have a high refractive index; and a method for producing the same. In these particles (C), the surface of metal oxide particles (A1) serving as a core is coated with a metal oxide (A2) containing titanium oxide, and the coating layer is further coated with a metal oxide (A3) having a metal oxide other than titanium oxide as the main component. The average primary particle diameter of the core/shell-type metal oxide particles (C) is 10 to 20 nm, and the metal oxide particles (A1) are rutile-type titanium oxide containing at least one selected from the group consisting of tin oxide, zirconium oxide, zinc oxide, iron oxide, nickel oxide and aluminium oxide.

Dependencies are inferred from the claim text.