Particles, aqueous dispersion and film of titanium oxide, and preparation thereof

Abstract

An aqueous titanium oxide-dispersed sol comprising titanium oxide particles dispersed in water, said sol comprising chloride ions in an amount of 50 to 10,000 ppm by weight as the chlorine element. Titanium tetrachloride is hydrolyzed to form an aqueous titanium oxide-dispersed sol and the chloride ion concentration thereof is controlled. Another aqueous titanium oxide-dispersed sol comprising brookite-type titanium oxide particles dispersed in water, said titanium oxide particles having an average particle size of not more than 0.5 μm and a specific surface area of not less than 20 m 2 /g. Addition of titanium tetrachloride to hot water at 75 to 100° C. followed by hydrolysis at 75° C. to the boiling point of the mixture.

1 - 26 . (canceled)  
     
     
         27 . An aqueous titanium oxide-dispersed sol comprising titanium oxide particles dispersed in water, said sol comprising chloride ions in an amount of 50 to 10,000 ppm by weight as the chlorine element.  
     
     
         28 . The aqueous titanium oxide-dispersed sol according to  claim 27 , wherein said titanium oxide particles are crystalline and have an average particle size of 0.01 to 0.1 μm.  
     
     
         29 . The aqueous titanium oxide-dispersed sol according to  claim 27 , wherein said titanium oxide particles are contained in an amount of 0.05 to 10 mol/l.  
     
     
         30 . The aqueous titanium oxide-dispersed sol according to any of the  claim 27 , wherein said sol contains a water-soluble polymer in an amount of 10 to 10,000 ppm by weight.  
     
     
         31 . The aqueous titanium oxide-dispersed sol according to any of the claims  27 , wherein said sol further contains alkyl silicate as an adhesive in an amount as silicon oxide of 1 to 50% by weight based on the weight of titanium oxide.  
     
     
         32 . A titanium oxide film which is formed on a substrate using the aqueous titanium oxide-dispersed sol as set forth in  claims 27  to  31 .  
     
     
         33 . The titanium oxide film according to  claim 32 , wherein said substrate is of a heat resistant material such as a glass, a ceramic and a metal or is one selected from the group consisting of synthetic resins, paper and wood.  
     
     
         34 . The titanium oxide film according to  claim 32 , wherein said substrate is glass.  
     
     
         35 . The titanium oxide film according to  claim 32 , wherein said titanium oxide film is a sintered film.  
     
     
         36 . A catalyst comprising titanium dioxide particles according to  claim 27  is formed on a catalyst carrier.  
     
     
         37 . The catalyst according to  claim 36 , wherein said catalyst carrier is selected from the group consisting of alumina and zirconia.  
     
     
         38 . A glass tube of an illuminator on which a film of said titanium dioxide particles according to  claim 27  is formed.  
     
     
         39 . A plastic cover of an illuminator on which a film of said titanium particles according to  claim 27  is formed.  
     
     
         40 . A window pane of a building on which a film of said titanium dioxide particles according to  claim 27  is formed.  
     
     
         41 . A wall of a building on which a film of said titanium dioxide particles according to  claim 27  is formed.