Basecoat and Associated Paperboard Structure
A basecoat including a pigment blend that includes a ground calcium carbonate component and a hyperplaty clay component, wherein the ground calcium carbonate component has a coarse particle size distribution, and wherein the hyperplaty clay component has an average aspect ratio of at least about 40:1.
1 . A basecoat comprising a pigment blend including a ground calcium carbonate component and a hyperplaty clay component, wherein at most about 60 percent of said ground calcium carbonate component has a particle size smaller than 2 microns, and wherein said hyperplaty clay component has an average aspect ratio of at least about 40:1.
2 . The basecoat of claim 1 wherein said average aspect ratio of said hyperplaty clay component is at least about 50:1.
3 . The basecoat of claim 1 wherein said average aspect ratio of said hyperplaty clay component is at least about 70:1.
4 . The basecoat of claim 1 wherein said average aspect ratio of said hyperplaty clay component is at least about 90:1.
5 . The basecoat of claim 1 wherein at most about 35 percent of said ground calcium carbonate component has a particle size smaller than 2 microns.
6 . The basecoat of claim 1 wherein said ground calcium carbonate component is at least about 10 percent by weight of said pigment blend and at most about 60 percent by weight of said pigment blend.
7 . The basecoat of claim 1 wherein said pigment blend consists essentially of said hyperplaty clay component and said ground calcium carbonate component.
8 . The basecoat of claim 1 further comprising a carrier, wherein said pigment blend is dispersed in said carrier to form a slurry.
9 . The basecoat of claim 1 wherein said pigment blend has a sediment void volume of at least about 45 percent.
10 . The basecoat of claim 1 wherein said pigment blend has a sediment void volume of at least about 47.5 percent.
11 . The basecoat of claim 1 wherein said pigment blend has a sediment void volume of at least about 50 percent.