Composite particles and method for production thereof

摘要

Disclosed are titanium dioxide-containing composite particles which can maintain whiteness of natural titanium dioxide even after calcination step, and can provide titanium dioxide-containing composite particles having excellent weather resistance. In each of the composite particles, at least one oxide layer containing silicon oxide and zirconium oxide is provided as coating components of titanium dioxide. That is, provided are composite particles including a base that contains titanium dioxide and at least one oxide layer that contains silicon oxide and zirconium oxide provided on the base, and a method of producing the composite particles.

主权项

1. Composite particles, comprising:
a base that contains titanium dioxide, and at least one oxide layer that contains silicon oxide and zirconium oxide provided on the base, wherein the oxide layer comprises a multilayer structure having a plurality of sublayers, including a first sublayer consisting of silicon oxide and a second sublayer consisting of zirconium oxide, wherein the composite particles further include at least one selected from the following,
(1) a third sublayer consisting of aluminum oxide disposed in the oxide layer, and(2) a hydroxide layer containing aluminum hydroxide disposed on top of the oxide layer.