Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Reexamination Certificate
2003-12-15
2010-10-05
Lorengo, Jerry (Department: 1793)
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
C106S486000, C106S487000, C106S488000, C106S485000, C423S432000
Reexamination Certificate
active
07806978
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.
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Bilimoria Bomi M.
Lyons Anthony V.
Pruett Robert J.
Wygant Roger W.
Yuan Jun
Abu Ali Shuangyi
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Imerys Pigments, Inc.
Lorengo Jerry
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