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US 7,597,755 B2Granted
Kaolin pigment products
AssigneeImerys Pigments, Inc.
InventorsDavid L. Light, Christopher R. L. Golley, Ernest Gay, Milton Constantin
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AssigneeImerys Pigments, Inc.
InventorsDavid L. Light, Christopher R. L. Golley, Ernest Gay, Milton Constantin
Estimating the term…
A pigment product for use in a coating composition to provide a gloss coating on paper, the pigment product comprising a processed particulate kaolin having a particle size distribution such that at least about 80% by weight of the particles have an equivalent spherical diameter less than about 2 p,m and in the range of from about 10% to about 20% by weight of the particles have an equivalent spherical diameter less than about 0.25 wm, the particles have a shape factor in the range of from about 20 to about 36 and the particles have a particle steepness in the range of about greater than about 35, more preferably in the range of about 35 to about 40, and wherein the kaolin is derived from a secondary kaolin source.
A pigment product comprising kaolin having a particle size distribution such that at least about 85% by weight of the particles have an equivalent spherical diameter less than about 2 μm, and from greater than 10% to about 20% by weight of the particles have an equivalent spherical diameter less than 0.25 μm, the particles have a shape factor in the range of from about 26 to about 40, and the particles have a particle steepness of greater than about 32, wherein said kaolin is derived from a crude secondary kaolin.
A method of making a pigment product comprising a steep, platy kaolin having a particle size distribution such that at least about 85% by weight of the particles have an equivalent spherical diameter less than about 2 μm and from about 15% to about 20% by weight of the particles have an equivalent spherical diameter less than 0.25 μm, the particles have a shape factor in the range of from about 26 to about 36, and the particles having a particle steepness in the range of about 35 to about 40, the method comprising:
Dependencies are inferred from the claim text.