Composite pigmentary material
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United States of America Patent
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Aug 16, 1994
Grant Date -
N/A
app pub date -
Jun 23, 1993
filing date -
Jun 24, 1992
priority date (Note) -
Expired
status (Latency Note)
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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.
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