Sakai Chemical Industry Co., Ltd.

Masaru Mikami

Atsuki Terabe

Kazunobu Abe

Kazuyoshi Muraoka

Harunobu Saito

Suzuo Sasaki

Tsutomu Yamamoto

Kohji Yamamoto

Makoto Tunashima

Mika Onai

Kazumi Sugimoto

Hirotaka Kawagishi

Yuji Kawasaki

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.

Composite particles and method for production thereof

The invention provides a surface-modified titanium dioxide particle inhibited in photocatalytic activity and reduced in amount of volatile water. The surface-modified titanium dioxide particle has on the surface a crystalline composite compound of at least one of alkaline earth metals selected from magnesium, calcium, barium and strontium complexed with titanium dioxide in an amount of 0.1-20% by weight based on the weight of the surface-modified titanium dioxide particle in terms of oxide of the alkaline earth metal. The surface-modified titanium dioxide particle is produced by heating a compound of an alkaline earth metal and a titanium dioxide particle at a temperature of 60&#xb0; C. or higher so that the alkaline earth metal is complexed with titanium dioxide to form a crystalline composite compound on the surface of the titanium dioxide particle in an amount of 0.1-20% by weight based on the weight of the surface-modified titanium dioxide particle in terms of oxide of the alkaline earth metal.

Surface-modified titanium dioxide particle and method for producing the same

Stable anatase titanium dioxide and process for preparing the same

Growing community of inventors

Iwaki, Japan

Masaru Mikami