PIGMENT COMPOSITIONS
A pigment composition may include an inorganic particulate material, a multivalent metal salt, and a non ionic dispersant. A substrate may be coated with an aqueous coating composition including the pigment composition. The substrate may be a paper product.
1 . A pigment composition comprising an inorganic particulate material, a multivalent metal salt and a non ionic dispersant.
2 . A pigment composition according to claim 1 , wherein the inorganic particulate material is selected from one or more of: an alkaline earth metal carbonate or sulphate, a hydrous kandite clay, an anhydrous kandite clay, talc or mica.
3 . A pigment composition according to claim 1 , wherein the inorganic particulate material is selected from one or more of: calcium carbonate, magnesium carbonate, dolomite, gypsum, kaolin, ball clay, metakaolin, fully calcined kaolin.
4 - 8 . (canceled)
9 . A pigment composition according to any one of claim 1 , wherein the inorganic particulate material has a d 50 of about 0.1 μm to about 2 μm.
10 - 11 . (canceled)
12 . A pigment composition according to any one of claim 1 , wherein the inorganic particulate material has a particle size distribution steepness factor of about 25 to about 70.
13 - 14 . (canceled)
15 . A pigment composition according to any one of claim 1 , wherein the multivalent metal salt is a divalent metal salt.
16 . A pigment composition according to claim 15 , wherein the divalent metal salt is an alkaline metal salt.
17 . A pigment composition according to claim 16 , wherein the alkaline metal salt is a calcium or magnesium or barium salt.
18 . A pigment composition according to any one of claim 1 , wherein the anion of the metal salt is selected from chloride, sulphate, nitrate or hydroxide.
19 - 24 . (canceled)
25 . A pigment composition according to claim 1 , wherein the non ionic dispersant is a polymer and comprises alkylene oxide monomers.
26 . A pigment composition according to claim 1 , wherein the non ionic dispersant is a polymer and comprises an uncharged hydrophobic chain.
27 . A pigment composition according to any one of claim 1 , wherein the non ionic dispersant comprises amine and/or phosphate group or groups.
28 . A pigment composition according to claim 1 , wherein the non ionic dispersant is a polymer and the polymer comprises amine and/or phosphate group or groups.
29 . A pigment composition according to any one of claim 1 , further comprising an ionic dispersant.
30 . (canceled)
31 . A pigment composition comprising an inorganic particulate material and calcium chloride, wherein the inorganic particulate material is selected from one or more of: magnesium carbonate, dolomite, gypsum, a hydrous kandite clay an anhydrous kandite clay, talc or mica.
32 - 37 . (canceled)
38 . A pigment composition according to any one of claim 31 , wherein the inorganic particulate material has a d 50 of about 0.1 μm to about 2 μm.
39 - 42 . (canceled)
43 . A pigment composition according to claim 1 , wherein the inorganic particulate material is selected from one or more of: magnesium carbonate, dolomite, gypsum, a hydrous kandite clay, an anhydrous kandite clay, talc or mica, and wherein the non ionic dispersant is a polymer and comprises alkylene oxide monomers.
44 . A pigment composition according to claim 1 , wherein the inorganic particulate material is selected from one or more of: magnesium carbonate, dolomite, gypsum, a hydrous kandite clay, an anhydrous kandite clay, talc or mica, and wherein the non ionic dispersant is a polymer and comprises an uncharged hydrophobic chain.
45 . A pigment composition according to any one of claim 1 , wherein the inorganic particulate material is selected from one or more of: magnesium carbonate, dolomite, gypsum, a hydrous kandite clay, an anhydrous kandite clay, talc or mica, and wherein the non ionic dispersant comprises amine and/or phosphate group or groups.
46 . A pigment composition according to claim 1 , wherein the inorganic particulate material is selected from one or more of: magnesium carbonate, dolomite, gypsum, a hydrous kandite clay, an anhydrous kandite clay, talc or mica, and wherein the non ionic dispersant is a polymer and the polymer comprises amine and/or phosphate group or groups.
47 - 62 . (canceled)
63 . A coated paper product comprising a substrate coated with an aqueous coating composition comprising the pigment coating composition according to claim 1 , water, and at least one binder, wherein the paper product further comprises a precoat.
64 - 75 . (canceled)