Method for preparing pigments
AssigneeTioxide Group Services Limited
InventorsWilliam J. Jones, Judith F. Tooze
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Abstract
A method for preparing pigmentary titanium dioxide is claimed. An aqueous solution of a titanium halide is mixed with 0.1 to 1.0% by weight titanium dioxide nuclei and the resultant mixture is heated in a sealed vessel to 150.degree. to 300.degree. C. at which temperature it is maintained for at least 15 minutes. The mixture is subjected to ultrasonic vibrations for at least a part of the heating process. The product of the process is useful as a white pigment without need for further treatment to optimise its particle size.
Claims18
A method for preparing pigmentary titanium dioxide comprising mixing an aqueous solution of a titanium halide with an amount of particulate titanium dioxide nuclei comprising 0.1 to 1.0% by weight based on weight of titanium halide expressed as TiO.sub.2, heating the mixture so obtained over a period in a sealed vessel to a temperature of from 150.degree. C. to 300.degree. C. and maintaining the mixture at a temperature between 150.degree. C. and 300.degree. C. for a further period of at least 15 minutes wherein the said mixture is subjected to the effect of ultrasonic vibrations during at least a part of at least one of said periods.
Dependencies are inferred from the claim text.