Photocatalytically hydrophilifiable coating composition

Details Photocatalytically hydrophilifiable coating composition Photocatalytically hydrophilifiable coating composition

C - Chemistry, Metallurgy

09

K

C09K 3/18 (2006.01) C03C 17/00 (2006.01) C09D 1/00 (2006.01) C09D 5/00 (2006.01) C09D 183/02 (2006.01) C09D 183/04 (2006.01) C09K 3/30 (2006.01) F21V 7/22 (2006.01) B01J 31/02 (2006.01)

Patent

CA 2260803

A composition is disclosed which can hydrophilify the surface of a member to impart an antifogging property to the surface of the member. The composition for hydrophilifying the surface of the member comprises at least (a) photocatalytic particles of a metallic oxide, (b) a precursor capable of forming a silicone resin film or a precursor capable of forming a silica film, and (c) a solvent, the total content of the photocatalytic particle and the solid matter of the precursor in the composition being 0.01 to 5% by weight. The hydrophilic property can be imparted simply by applying the composition onto a member and drying or heating the composition applied to the member. The resultant hydrophilic thin film is transparent and, hence, does not sacrifice the transparency and appearance of a member required to be transparent. Further, the surface of a member with the above composition applied thereto has such a property that water droplets adhered thereon can be immediately removed by vaporization and the surface is less likely to be soiled and, even when a contaminant is adhered thereon, can easily release the contaminant therefrom.

Cette invention se rapporte à une composition qui rend la surface d'un objet hydrophile, afin de lui conférer des propriétés anti-buée. Cette composition comprend: (a) des particules photocatalytiques constituées d'un oxyde de métal; (b) au moins un composant choisi dans le groupe constitué par de la silice particulaire, des précurseurs capables de former des films de résine de silicone et des précurseurs capables de former des films de silice; et (c) un solvant; la teneur totale en composant solide des composants (a) et (b) de la composition étant comprise entre 0,01 et 5 % en poids. Cette composition peut rendre hydrophile un objet par un moyen extrêmement simple, c'est-à-dire en appliquant ladite composition audit objet et en la faisant sécher ou en la chauffant. Le mince film hydrophile ainsi formé est transparent et il n'affecte par conséquent en rien la transparence et l'aspect de l'objet, même si cet objet doit essentiellement être transparent. La surface d'un objet sur lequel a été formé un film à partir de ladite composition possède des propriétés telles que les gouttes d'eau adhérant à sa surface s'évaporent immédiatement et sa surface ne se salit guère et peut être aisément nettoyée si elle est salie.

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