Daiichi Kigenso Kagaku Kogyo Co., Ltd.

Toto Ltd.

Dailchi Kigenso Kagaku Kogyo Co., Ltd.

Fumiyuki Takasaki

Yoshiaki Sakatani

Hideki Kobayashi

Yoshiyuki Nakanishi

Tatsushi Nagae

Soshi Oyama

Provided are surface-modified metal compound particles comprising metal compound particles which are surface-modified with one or more types of carboxylic acid selected from a methacrylic acid, an acrylic acid, and a propionic acid, and a 12-hydroxystearic acid, wherein a portion or all of the one or more types of carboxylic acid selected from a methacrylic acid, an acrylic acid, and a propionic acid is a carboxylic acid (protonated) type.

Surface-modified metal compound particles, and method for producing surface-modified metal compound particles

These surface-modified metal compound particles have metal compound particles the surfaces of which are modified by: at least one first carboxylic acid selected from the group consisting of a methacrylic acid, an acrylic acid, and a propionic acid; and at least one second carboxylic acid selected from the group consisting of a C6-C16 fatty acid and a C7-C32 monovalent carboxylic acid having at least one benzene ring, wherein at least a portion of the first carboxylic acid is a carboxylic acid type in which a hydrogen atom of the carboxy group is not dissociated as an ion.

Disclosed is an inorganic material that can exhibit an excellent photocatalytic gas decomposition function while maintaining an abrasion resistance on a level that is usually required of this type of inorganic materials. The inorganic material includes an inorganic material base and a photocatalyst layer that is formed by firing and is provided on the surface of the inorganic material base, the photocatalyst layer containing: photocatalyst particles; zirconia particles having a BET specific surface area of not less than 10 m/g or crystalline zirconia particles having a mean crystallite diameter of less than 20 nm; and an alkali silicate. The inorganic material including the photocatalyst layer exhibits a high photocatalytic gas decomposition function while maintaining an abrasion resistance on a level that is usually required of this type of inorganic materials.

Inorganic material comprising photocatalyst layer, method for producing same, and photocatalyst coating liquid for inorganic material

A sol of the present invention is a sol comprising zirconium oxalate compound as a dispersoid, wherein a mol ratio of oxalic acid to Zr (oxalic acid/Zr) is from 1.2 to 3 and a particle diameter D50 of the dispersoid is from 10 to 100 nm. This sol is produced by adding oxalic acid to a dispersion liquid of zirconium hydroxide, and the addition of oxalic acid is carried out in twice.

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Osaka, Japan

Fumiyuki Takasaki