Treated inorganic particle
AssigneeThe Chemours Company Tt, LLC
InventorCharles David Musick
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Abstract
The disclosure provides a treated inorganic particle, in particular a titanium dioxide particle, having reduced photoactivity, lower acid solubility and improved anti-microbial properties comprising: an inorganic core particle, in particular a titanium dioxide particle; a first treatment of silica, wherein the silica is added in a single step; and a second treatment comprising co-precipitated zinc oxide and alumina. These particles have reduced photoactivity, lower acid solubility and improved anti-microbial properties.
Claims2
A process for forming titanium dioxide particles having reduced photoactivity and improved anti-microbial properties comprising:
- (a) forming an aqueous suspension of titanium dioxide core particles;
- (b) depositing a first treatment of silica on the titanium dioxide core particles, wherein the silica is added in a single step;
- (c) depositing a second treatment over the first treatment, said second treatment comprising co-precipitated zinc oxide and alumina;
- and
- (d) recovering the solids, washing free from water soluble species and drying.
Dependencies are inferred from the claim text.