Toshiba Materials Co., Ltd.

Kazunari Otsuka

Yasuhiro Shirakawa

Masami Okamura

Akira Sato

Kayo Nakano

Ryotaro Matsuda

Ariyoshi Ishizaki

Hideki Okawa

Takaya Kamakura

Kiyoshi Yokokura

An object of the invention is to provide a photocatalyst material having a higher catalyst effect than conventional photocatalyst materials. The photocatalyst material of the invention contains, as its major component, a tungsten oxide powder excited by a light source which emits light having a wavelength of 430 to 500 nm, the photocatalyst material having a decomposition ability of 50% or more wherein the decomposition ability is given by the following equation based on the following test: [Test for decomposition ability]: 1 g of a tungsten oxide powder and 20 ppm of acetaldehyde (amount A) are poured into a 3-liter glass container, and acetaldehyde (amount B) is measured after light having a peak wavelength of 460 nm&#xb1;10 nm is irradiated to the mixture for 2 hours to measure the decomposition ability (%): Decomposition ability (%)=[(acetaldehyde amount A&#x2212;acetaldehyde amount B)/acetaldehyde amount A]&#xd7;100.

Photocatalyst material, photocatalyst composition using the same and photocatalyst product

Growing community of inventors

Yokohama, Japan

Kazunari Otsuka