| abstract |
The present invention provides a coating composition for forming a titanium oxide, comprising (A) an aqueous peroxo titanic acid solution obtained by mixing, with aqueous hydrogen peroxide, a titanium compound containing a group or groups convertible to a hydroxyl group by hydrolysis and/or a low condensate of the compound and (B) polyethylene glycol; a process for forming a titanium oxide film, comprising applying the coating composition to a substrate and calcining the resulting coating at a temperature not lower than 200° C. to form a porous titanium oxide film; and a photocatalyst comprising a porous titanium oxide film formed on a substrate by the process. |