| abstract |
Provided is a crystalline TiO 2 powder in the form of aggregated primary particles having a variable sintering stability at a BET surface area of 70-100 m 2 /g and a rutile content of greater than 10% but less than or equal to 40%, and a process for preparing the crystalline TiO 2 powder, which involves: introducing a TiCl 4 vapor and, separately therefrom, H 2 and a primary air into a mixing chamber to produce a gaseous mixture; igniting the gaseous mixture in a burner to produce a flame, which is burned into a reaction chamber to produce the crystalline TiO 2 powder and gaseous substances; and separating the crystalline TiO 2 powder from the gaseous substances, wherein the relative amounts of TiCl 4 vapor, H 2 and primary air are selected to provide crystalline TiO 2 powder having the aforementioned BET surface area and rutile content, with the proviso that factor A has a value of 0.1-0.4·10 5 g/m 2 in accordance within the following formula: factor A=10 5 {[(TiCl 4 vapor×H 2 )/(primary air×gaseous mixture)]/BET]}. |