PROCESS FOR THE PRODUCTION OF COATED TITANIUM DIOXIDE PIGMENTS
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United States of America Patent
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Issued Date -
Jun 11, 2009
app pub date -
Dec 5, 2007
filing date -
Dec 5, 2007
priority date (Note) -
Abandoned
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Abstract
A process for the preparation of pigment-grade titanium dioxide is provided that produces substantially anatase-free titanium dioxide with a uniform coating of a metal oxide without producing separate particles of the metal oxide that are not incorporated into the coating. The process comprises mixing a titanium dioxide precursor with a silicon compound to form an admixture and introducing the admixture and oxygen into a reaction zone to produce substantially anatase-free titanium dioxide. The titanium dioxide produced is contacted with a metal oxide precursor homogeneously mixed with a solvent component downstream of the reaction zone to form a uniform coating of the metal oxide on the titanium dioxide particles.
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