The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 2010
Filed:
Dec. 15, 2003
Robert J. Pruett, Milledgeville, GA (US);
Jun Yuan, Kathleen, GA (US);
Bomi M. Bilimoria, Macon, GA (US);
Roger W. Wygant, Sandersville, GA (US);
Anthony V. Lyons, Macon, GA (US);
Robert J. Pruett, Milledgeville, GA (US);
Jun Yuan, Kathleen, GA (US);
Bomi M. Bilimoria, Macon, GA (US);
Roger W. Wygant, Sandersville, GA (US);
Anthony V. Lyons, Macon, GA (US);
Imerys Pigments, Inc., Roswell, GA (US);
Abstract
The present invention relates to a kaolin composition having improved physical properties, for example, for use in the production of paper products. The composition can comprise kaolin having a shape factor of at least about 20. The kaolin can have a particle size distribution such that at least about 94% by weight of the kaolin can have an esd of less than about 2 μm and/or at least about 80% by weight of the kaolin can have an esd of less than 1 μm. The amount of the kaolin having an esd of less than about 0.25 μm can range from about 25% to about 60% by weight. The Hercules viscosity of the kaolin product is less than 4000 rpm at 18 dynes at 63% solids and less than 1500 rpm at 18 dynes at 69% solids when measured using the 'A' bob. The present invention also relates to an improved method for making the kaolin product from sedimentary kaolin.