Pigment with enhanced durability and plastic materials made therewith
AssigneeIneos Pigments USA Inc.
InventorsModasser El-Shoubary, Lee Chris Mundle, Mark B. Watson
Life of this patent
Estimating the term…
Abstract
The invention provides a method for enhancing the durability of a titanium dioxide material, the method including mixing citric acid and an alumina source with an aqueous slurry of titanium dioxide particles and water to form a mixture, the mixture having an acidic pH; and raising the pH of the mixture to a pH of no more than about 7.5 to form alumina-coated titanium dioxide particles. The invention also provides a pigmented plastic article including alumina-coated titanium dioxide particles prepared according to the invention dispersed in a polymer material.
Claims17
A method of enhancing the durability of a titanium dioxide material, comprising:
- a) mixing citric acid and an alumina source with an aqueous slurry of titanium dioxide particles and water to form a mixture, the mixture having an acidic pH of less than 5.5;
- and
- b) raising the pH of the mixture to a pH of no more than about 7.5 to form alumina-coated titanium dioxide particles,
- wherein the method is substantially free of use of silica materials and phosphorus materials;
- and
- wherein the alumina-coated titanium dioxide particles comprise alumina in amorphous form.
Dependencies are inferred from the claim text.