C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
C01G 23/053 (2006.01)
Patent
CA 2343085
Disclosed is an amorphous titanium-containing finely divided particulate material. An aqueous sol containing the substance in a concentration of 0.1 to 6.5 mol/l in terms of titanium has a light transmittance of 85% or higher at a wavelength of 450 to 700 nm when the sol has a thickness of 10 nm. The substance generally has an average particle diameter of 0.8 to 50 nm, and gives a thin film having high photocatalytic activity and transparency. The finely particulate substance is obtained by hydrolizing titanium tetrachloride in an aqueous solution in the presence of a specific carboxylic acid, i.e., oxalic acid, citric acid, tartaric acid, malic acid or succinic acid. The sot is useful for coating a substrate such as a lighting appliance to form the thin film. The film exhibits higher transparency than films formed of similar materials known in prior art.
L'invention concerne une substance à fines particules de titane caractérisée en ce qu'une solution aqueuse renfermant ladite substance selon une concentration de titane comprise entre 0,1 et 6,5 mol/l et chauffée jusqu'au point d'ébullition présente un facteur de transmission de la lumière égal ou supérieur à 85 % à une longueur d'onde comprise entre 450 et 700 nm, lorsque la solution a une épaisseur de 10 mm. En règle générale, la substance comporte des particules dont le diamètre moyen va de 0,8 à 50 nm, donnant un film mince à activité catalytique et transparence élevées. Ladite substance est obtenue par hydrolyse de tétrachlorure de titane dans une solution aqueuse, en présence d'acide carboxylique.
Ohmori Masahiro
Tamura Katsutoshi
Showa Denko Kabushiki Kaisha
Smart & Biggar
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