Tronox LLC

Kerr-mcgee Chemical, LLC

Jeffrey D Elliott

Bruce R Palmer

Daniel H Craig

David Frank Marshall

Bruce Lynn Roberts

Kamlesh G Panjnani

Ronnie L Hoskins

Harmon E Ray

David F Marshall

A method of producing a titanium dioxide pigment is provided. Also provided is a method of improving the processability of titanium dioxide particles without adversely affecting the rheological properties of the titanium dioxide particles.

Methods of producing a titanium dioxide pigment and improving the processability of titanium dioxide pigment particles

An improved process is described for manufacturing zirconia-treated titanium dioxide pigments, wherein the zirconia treatment is accomplished in the process of fluidizing a titanium dioxide filter or press cake and then drying the same, through the addition to the filter or press cake of one or more alkaline water-soluble zirconium reagents selected from ammonium zirconyl carbonate, the water-soluble ammonium zirconyl carboxylates and mixtures of these. Aqueous solutions of such zirconium reagents, in addition to being effective for imparting a zirconia surface treatment to the titanium dioxide materials, also prove to be effective fluidizing agents for forming high solids dispersions of the zirconia-treated titanium dioxide pigment materials which can be spray dried without substantial dilution and excessive energy requirements.

Process for manufacturing zirconia-treated titanium dioxide pigments

A process for preparing an improved pigment which is readily dispersible in paints and plastics concentrates is provided. In accordance with the process, a particulate pigment is mixed with water to form a slurry thereof, and a surface active agent is mixed with the slurry so that the pigment therein is coated therewith. A preferred surface active agent is a mixture of ethoxylated sorbitan derivatives, non-ethoxylated mono and diglycerides and ethoxylated mono and diglycerides. After the pigment has been coated with the surface active agent, the coated pigment is dried.

Process for preparing pigment dispersible in paints and plastics concentrates

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Oklahoma City, OK, United States of America

Jeffrey D Elliott