Colored titaniferous coating pigment obtained as a flocculated by-product in a kaolin purification process
Patent 5584394 Issued on December 17, 1996. Estimated Expiration Date: 
March 15, 2015. 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.
March 15, 2015. 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 ReferencesOpacifying pigments and methods for making same Method for producing high opacifying kaolin pigment Low brightness functional pigment from process by-product Low brightness functional pigment from process by-product Patent #: 5190615 InventorsAssigneeApplicationNo. 404772 filed on 03/15/1995US Classes:209/5, Deflocculation and flocculation106/416, Clay containing or derived therefrom106/439, Iron, tungsten, molybdenum, or cerium compound containing (Fe, W, Mo, Ce)106/446, Silicon containing106/486, Clay or material derived therefrom containing209/10, TREATMENT SUBSEQUENT501/146Chemical pretreatmentExaminersPrimary: Milef, BorisAttorney, Agent or FirmForeign Patent References
International ClassB03B 001/00AbstractDescribed is a process for separating a mixture of finely divided minerals into constituents thereof. In particular, the invention relates to a procedure for effecting such separation by a novel selective flocculation technique wherein a dispersed aqueous pulp containing the mixture of minerals is preconditioned for selective flocculation with an anionic polymer by addition of both a fatty acid such as oleic acid and source of polyvalent cation such as calcium chloride. The fatty acid and cation of the salt selectively coat the component of the mixture that is subsequently flocculated with the anionic polymer. A polyacrylate salt dispersant is preferably used in the process. The invention is especially adapted to the separation of colored titaniferous impurities from kaolin clay in which case both a white purified kaolin product and a strongly flocculated dun-colored titania/kaolin mixture are recovered and then dispersed producing a material useful as a paper coating pigment.Field of SearchDeflocculation and flocculationTREATMENT SUBSEQUENT Gravity liquid Suspension Water or aqueous solution Clay pretreatment Chemical pretreatment Using alkaline compound treating agent Using organic substance as treating agent Clay containing or derived therefrom Iron, tungsten, molybdenum, or cerium compound containing (Fe, W, Mo, Ce) Aluminum compound or silicon containing Silicon containing Clay or material derived therefrom containing Clay or material derived from clay containing, e.g., bentonite, montmorillonite, etc. | |
