Patent ID: 6695906
Filing Date: 2004-02-24
Classification: C01P,C09C

Abstract:
A continuous process for preparing a titanium dioxide pigment comprising: a) preparing an aqueous slurry of titanium dioxide base particles at a temperature below about 75Â° C. and at a pH of from about 2.0 to about 9.0; b) adding a silica compound while maintaining the pH of the slurry in the range of from about 2.4 to about 10.5 and the temperature of the slurry below about 75Â° C. so as to form silica coated base titanium dioxide particles in the slurry; and c) adding an alumina compound while maintaining the pH of the slurry in the range of from about 5.5 to about 7.5 and the temperature of the slurry below 75Â° C. so as to form the titanium dioxide pigment.