Titanium dioxide pigment composite and method of making same

Details Titanium dioxide pigment composite and method of making same Titanium dioxide pigment composite and method of making same

2007-09-04

2007-09-04

Green, Anthony J. (Department: 1755)

Compositions: coating or plastic

Materials or ingredients

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

C106S436000, C106S442000, C427S215000, C427S218000, C427S219000, C428S403000, C428S404000, C428S407000

Reexamination Certificate

active

11590134

ABSTRACT:
A process for producing an improved titanium dioxide pigment composite is provided, as are particles produced thereby. The process comprises producing a slurry comprising titanium dioxide particles, leaching alumina from the surface of the titanium dioxide particles in the presence of a soluble phosphate and precipitating aluminum phosphate from the slurry onto the surface of the titanium dioxide particles thereby forming a uniform coating of aluminum phosphate on the surfaces of the titanium dioxide particles. An anionic poly-electrolyte can be added to the resulting slurry. The slurry can then be treated such that the anionic poly-electrolyte forms an additional coating on the aluminum phosphate-coated titanium dioxide particles.

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