Process for producing coated tio2 pigment using cooxidation...

C - Chemistry – Metallurgy – 09 – C

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C09C 1/36 (2006.01) C01G 23/07 (2006.01) C09C 3/06 (2006.01)

Patent

CA 2309553

The present invention provides a process for producing titanium dioxide (TiO2) pigment having a coating comprising silica and a second oxide selected from the group consisting of oxides of boron, phosphorus, magnesium, niobium, germanium, and mixtures thereof, comprising the steps of (a) reacting titanium tetrachloride (TiCl4) in the vapor phase with an aluminum compound and an oxygen-containing gas in a reactor at a temperature in the range of about 900 °C to about 1600 °C to provide a gaseous suspension comprising TiO2 particles, (b) contacting the gaseous suspension comprising the TiO2 particles with a silicon halide and an oxide precursor of boron, phosphorus, magnesium, niobium, germanium, and mixtures thereof, and (c) cooling the gaseous suspension to produce TiO2 pigment having a coating comprising silica and a second oxide.

La présente invention porte sur un procédé de production d'un pigment au dioxyde de titane (TiO2) dont l'enrobage comprend de la silice et un second oxyde sélectionné dans le groupe comprenant des oxydes de bore, phosphore, magnésium, niobium, germanium et des mélanges de ceux-ci. Le procédé consiste à: (a) faire réagir le tétrachlorure de titane (TiCl4) en phase vapeur avec un composé d'aluminium et un gaz contenant de l'oxygène dans un réacteur à une température comprise entre environ 900 DEG C et environ 1600 DEG C de façon à obtenir une suspension gazeuse comprenant des particules de TiO2, (b) mettre en contact la suspension gazeuse comprenant les particules de TiO2 avec un halogénure de silicium et un précurseur d'oxyde de bore, phosphore, magnésium, niobium, germanium et des mélanges de ceux-ci, et (c) refroidir la suspension gazeuse de façon à produire le pigment TiO2 dont l'enrobage comprend de la silice et un second oxyde.

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