Method for reducing the viscosity and for refining kaolin clays
CA 1075726 A · Owner: J. M. Huber Corporation · Inventors: Kunkle, Albert C.; Kollmar, Carl E. (Jr.)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for reducing the viscosity and for refining crude kaolin clays is disclosed. The inherent viscosities of crude kaolin clay ores, particularly those having acceptable optical and purity properties for use in preparing paper coating pigments, but normally rejected because of their high inherent viscosities, are significantly reduced by contacting an aqueous slurry of the crude clay with an inorganic polymeric complex having the general formula AI(OH)yA3-yx, wherein x = 6 to 24, y = 1.0 to 2.75 and A is selected from the group consisting of Cl?, (SO?)0.5 and NO?. In a preferred embodiment the above treated clay is also subjected to a high shear mixing action or kneading prior to …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted April 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 15, 1997.
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Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.