Composite pigmentary material

Details Composite pigmentary material Composite pigmentary material

C - Chemistry, Metallurgy

09

C

C09C 1/02 (2006.01) C09C 1/00 (2006.01) C09C 1/36 (2006.01) C09C 3/06 (2006.01) C09D 17/00 (2006.01)

Patent

CA 2098323

ABSTRACT OF THE DISCLOSURE COMPOSITE PIGMENTARY MATERIAL A new process for preparing a composite pigment from titanium dioxide and calcium sulphate is provided in which the calcium sulphate is milled to a particle size less than 10 microns, mixed with titanium dioxide and the mixed particulates are coated with an oxide or hydrous oxide of a metal or silicon. The process can particularly be employed in conjunction with a sulphate-process titanium dioxide plant in which by-product sulphuric acid is converted to gypsum. The composite pigment shows improved optical properties in comparison to a mixture of titanium dioxide and gypsum.

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