Composite pigmentary material

Details Composite pigmentary material Composite pigmentary material

1993-06-23

1994-08-16

Group, Karl

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106449, 106446, 106464, C09C 136

Patent

active

053383540

ABSTRACT:
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.

REFERENCES:
patent: 3726700 (1973-04-01), Wildt

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