COATING COMPOSITION AND COATED PAPER AND COATED PAPERBOARD
A coating composition may include kaolin having a shape factor less than about 70 and calcium carbonate, wherein less than about 90% by weight and greater than about 60% by weight of particles of the calcium carbonate have an equivalent spherical diameter (esd) less than 2 microns. The coating composition may include a thickener present in an amount ranging from about 0.1% to about 0.9% by active dry weight of the composition. A coating composition may include kaolin having a shape factor less than about 70 and calcium carbonate having a mean particle size (d 50 ) of at least about 2.4 microns and a steepness factor of at least about 30. The coating composition may be a paper basecoat composition or a paperboard basecoat composition. A paper or paperboard product may include the coating composition on at least one surface of the paper product or paperboard product.
1 . A coating composition comprising:
kaolin having a shape factor less than about 70; and
calcium carbonate, wherein less than about 90% by weight and greater than about 60% by weight of particles of the calcium carbonate have an esd less than 2 microns.
2 . The composition of claim 2 , further comprising a thickener.
3 . The composition of claim 2 , wherein the thickener is present in an amount ranging from about 0.1% to about 0.9% by active dry weight of the composition.
4 - 5 . (canceled)
6 . The composition of claim 2 , wherein the thickener is selected from the group consisting of alkali-soluble emulsion polyacrylate thickeners, hydrophobically-modified alkali-soluble emulsion polyacrylate thickeners, and CMC (carboxymethyl celluloses) thickeners.
7 . The composition of claim 1 , wherein less than about 30% by weight of the kaolin has an esd less than about 0.25 micron.
8 - 10 . (canceled)
11 . The composition of claim 1 , wherein less than about 80% by weight of the kaolin has an esd less than about 1 micron.
12 . (canceled)
13 . The composition of claim 1 , wherein less than about 80% by weight and greater than about 60% by weight of the particles of the calcium carbonate have an esd less than 2 microns.
14 - 17 . (canceled)
18 . A paperboard product comprising the coating composition of claim 1 on at least one surface of the paperboard product.
19 . A coating composition comprising:
kaolin having a shape factor less than about 70; and
calcium carbonate having a d 50 of at least about 2.4 microns and a steepness factor of at least about 30.
20 . The composition of claim 19 , further comprising a thickener.
21 . The composition of claim 20 , wherein the thickener is present in an amount ranging from about 0.1% to about 0.9% by active dry weight of the composition.
22 - 23 . (canceled)
24 . The composition of claim 20 , wherein the thickener is selected from the group consisting of alkali-soluble emulsion polyacrylate thickeners, hydrophobically-modified alkali-soluble emulsion polyacrylate thickeners, and CMC (carboxymethyl celluloses) thickeners.
25 . The composition of claim 19 , wherein less than about 30% by weight of the kaolin has an esd less than about 0.25 micron.
26 - 28 . (canceled)
29 . The composition of claim 19 , wherein less than about 80% by weight of the kaolin has an esd less than about 1 micron.
30 . (canceled)
31 . The composition of claim 19 , wherein the calcium carbonate has a d 50 of at least about 2.6 microns.
32 - 33 . (canceled)
34 . The composition of claim 19 , wherein the calcium carbonate has a steepness factor of at least about 32.
35 - 41 . (canceled)
42 . A paperboard product comprising the coating composition of claim 19 on at least one surface of the paperboard product.