| 摘要 |
PROBLEM TO BE SOLVED: To provide a photocatalytic, hydrophilic coating compsn. which possesses excellent long-term storage stability and highly hydrophlizes the surface of a member and maintains the hydrophilicity by incorporating specified photocatalytic titanium oxide particles (B) into a coating forming element (A) comprising a specified siloxane. SOLUTION: The component (A) comprises a siloxane represented by formula I (R represents a functional group comprising a monovalent org. group or a functional group comprising a monovalent org. group and H; X is an alkoxy or a halogen; 0<p<2; and 0<q<4) and, upon curing, forms a coating of a silicone resin. The component (B) compriser titanium oxide particles having a surface coated with inorg. oxide particles having an isoelectric point of not more than 5 in terms of pH, dispersed in the coating forming element, and, upon photoexcitation, functions to photocatalytically replace at least part of org. groups bonded to the silicon atom in the silicone molecule on the surface of the coating by hydroxyl groups and, according to the photoexcitation, further hydrophilizes the surface of the coating. The thickness of the surface layer is pref. not more than 0.4μm, and the excitation light dose is not less than 0.001mW/cm<2> .
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