Kaolin pigment products
OwnerDavid O. Cummings, Anthony V. Lyonsinventors
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Abstract
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 μm and in the range of from about 15% to about 40% by weight of the particles have an equivalent spherical diameter less than about 0.25 μm and the particles have a shape factor in the range of from about 30 to about 60 and wherein the pigment product comprises a blend of Component A: a particulate kaolin in which the particles have a shape factor of at least about 45, and Component B: a particulate kaolin in which the particles have a shape factor of less than about 20.
Claims24
A pigment product comprising a 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 μm and from about 15% to about 40% by weight of the particles have an equivalent spherical diameter less than about 0.25 μm and the particles have a shape factor in the range of from about 35 to about 60 and wherein the pigment product comprises a blend of
- Component A:
- a particulate kaolin in which the particles have a shape factor of at least about 45, and
- Component B:
- a particulate kaolin in which the particles have a shape factor of less than about 20.
A method of making a pigment product a 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 μm and from about 15% to about 40% by weight of the particles have an equivalent spherical diameter less than about 0.25 μm and the particles have a shape factor in the range of from about 35 to about 60, the method comprising
- blending Component A:
- a particulate kaolin in which the particles have a shape factor of at least about 45;
- with
- Component B:
- a particulate kaolin in which the particles have a shape factor of less than about 20.
Dependencies are inferred from the claim text.