Method for making a photodurable aqueous titanium dioxide pigment slurry using a high level of aluminum co-oxidant
Patent 5824146 Issued on October 20, 1998. Estimated Expiration Date: 
July 3, 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.
July 3, 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 2488439 2559638 3036926 3340008 3524818 3547671 3640744 3650793 Process for removing chloride impurities from TiO2 Process for producing rutile TiO2 InventorAssigneeApplicationNo. 888083 filed on 07/03/1997US Classes:106/442, Aluminum compound or silicon containing106/436, Titanium compound containing (Ti)106/437, Oxidation of titanium tetrahalide or product106/443, Phosphorus containing106/445Organic material containingExaminersPrimary: 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. This method involves reacting titanium tetrachloride, aluminum chloride and an oxygen-containing gas in the presence of a nucleant in the vapor phase to produce TiO2 pigment. A sufficient amount of aluminum chloride is added to provide at least 2 wt. % alumina in the TiO2 pigment. The TiO2 pigment is separated from the reaction gases; and mixed with sufficient water to produce a TiO2 slurry comprising at least 78 wt. % TiO2 solids. The slurry may be used in coating formulations such as paints.Other References
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