Tio2 pigment coated successively with silica and alumina

Details Tio2 pigment coated successively with silica and alumina Tio2 pigment coated successively with silica and alumina

C - Chemistry, Metallurgy

09

C

117/46.1

C09C 1/36 (2006.01)

Patent

CA 1045912

ABSTRACT OF THE DISCLOSURE A process for treating pigmentary TiO2 is disclosed in which an aqueous slurry of TiO2 is successively treated with alkaline solutions of a soluble silicate, a soluble al- uminum salt, a soluble silicate and a soluble aluminum salt, while maintaining the pH of the slurry in the range of about 5 to 9, to provide successive precipitations of 1 to 4% silica, 4 to 9% alumina, 1 to 4% silica and 4 to 9% alumina, the per- centages being based on the weight of TiO2. The resultant product is outstanding in hiding power without substantial sacrifice to other properties such as film integrity.

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