Method for making a photodurable aqueous titanium dioxide pigment slurry
Patent 5824145 Issued on October 20, 1998. Estimated Expiration Date: 
May 14, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 14, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2187050 3770470 Process for producing rutile TiO2 Production of an optically efficient titanium slurry Media milling pigment slurries to eliminate or reduce oversize particles High gloss durable TiO2 pigment Patent #: 5554216 InventorsAssigneeApplicationNo. 856062 filed on 05/14/1997US Classes:106/442, Aluminum compound or silicon containing106/436, Titanium compound containing (Ti)106/443, Phosphorus containing106/445, Organic material containing428/403CoatedExaminersPrimary: Bell, Mark L.Assistant: Hertzog, Scott L. Foreign Patent References
International ClassC09C 001/36AbstractThis invention relates to a new method for making a photodurable, aqueous titanium dioxide (TiO2) pigment slurry. The method involves mixing amorphous alumina, TiO2 pigment particles, water, and at least one dispersant to form the slurry. The initial slurry comprises at least about 78 wt. % TiO2 solids and at least about 3 wt. % alumina. The resulting slurry may be diluted to a lower TiO2 solids content and subsequently screened and media-milled. The titanium dioxide pigment slurry is suitable for use in coatings formulations such as paints.Other References
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