Toto Ltd.

Jhcc Ltd.

Okitsumo Incorporated

Toto Okitsumo Coatings Ltd.

Koji Okubo

Tatsuhiko Kuga

Mitsuhide Shimohigoshi

Kazumasa Okita

Kazuo Takahashi

Akira Shimai

Norio Sendoda

Hiromasa Tokudome

Hiroyuki Fujii

Kyoko Kataoka

Saori Sonokawa

Norio Sendora

A method of producing a photocatalytic coating material which includes: the steps of coating the surface of a base material having hydrophobic substances on its surface with a photocatalytic coating material including at least (a) photocatalytic oxide particles, (b) a hydrophobic-resin emulsion, (c) water, and (d) silica particles, and hardening the coated material. The average sizes of the ingredient (a) and the ingredient (d) are smaller than that of the emulsified particles of the hydrophobic resin dispersed in the ingredient (b), ingredient (a) constitutes 1 to &#x3c;5% by weight of the total solid matter of the coating material, ingredient (d) constitutes 1 to 90% by weight of a total solid matter of the coating material, and once the coating material is applied onto a base material, the photocatalytic oxide particles and the silica particles move upward and a coating film 1 &#x3bc;m to 1 mm thick is formed.

Method for producing photocatalytic coating material

A self-cleaning member comprising a member having a porous surface is disclosed. The member has a contact angle hysteresis &#x394;&#x3b8; (=&#x3b8;a&#x2212;&#x3b8;r), which is a difference between an advancing contact angle &#x3b8;a and a receding contact angle &#x3b8;r measured by a dynamic contact angle measurement with an extension/contraction method, of 80 degree or more at the surface layer and a receding contact angle &#x3b8;r of 25 degree or less, is capable of forming a water film on the surface by water provided and of allowing an ionic or reactive contaminant to be washed away without fixation.

Self-cleaning member and coating composition

This invention is intended to provide a photocatalytic coating material which includes: at least (a) photocatalytic oxide particles; (b) a hydrophobic-resin emulsion; and (c) water, wherein the average particle size of the photocatalytic oxide particles is smaller than that of the particles dispersed in the hydrophobic-resin emulsion. This invention is also intended to provide a self-cleaning water-base coating composition which includes: (a) water-based silicone emulsion or the like; (b) photocatalytic particles or a photocatalytic sol; and (c) water, wherein the solid matter of the ingredient (b) constitutes less than 5% by weight of the total solid matter of the coating composition. This invention is also intended to provide a self-cleaning water-base coating composition which includes: (a) water-based silicone emulsion or the like; (b) whisker or the like; (c) photocatalytic particles; (d) an inorganic coloring pigment; and (e) water.

Photocatalytic coating material, photocatalytic composite material and method for producing the same, and self-cleaning water-based coating composition and self-cleaning member

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Fukuoka, Japan

Koji Okubo