Compositions

1. An article comprising:

i) a paper product comprising a co-processed microfibrillated cellulose and inorganic particulate material composition, wherein the microfibrillated cellulose has a fibre steepness of from about 20 to about 50 and a d 50 of from about 25 μm to about 250 μm; and

ii) one or more functional coatings on the paper product.

2. The article according to claim 1 , wherein the microfibrillated cellulose is obtained by microfibrillating a fibrous substrate comprising cellulose in the presence of an inorganic particulate material, wherein the fibrous substrate comprising cellulose is in the form of a chemical pulp, mechanical pulp, chemithermomechanical pulp, or a combination thereof.

3. The article according to claim 1 , wherein the inorganic particulate material is selected from the group consisting of calcium carbonate, magnesium carbonate, dolomite, gypsum, kaolin, halloysite, ball clay, metakaolin, fully calcined kaolin, talc, mica, huntite, hydromagnesite, ground glass, perlite, or diatomaceous earth, or combinations thereof.

4. The article according to claim 1 , wherein the paper product comprises from about 0.5 wt. % to about 50 wt. % of the co-processed microfibrillated cellulose and inorganic particulate material composition.

5. The article according to claim 1 , wherein the paper product comprises from about 25 wt. % to about 35 wt. % of the co-processed microfibrillated cellulose and inorganic particulate material composition.

6. The article according to claim 5 , wherein the paper product is a linerboard or a cardboard.

7. The article according to claim 1 , wherein the functional coating is a polymer, a metal, an aqueous composition, or a combination thereof.

8. The article according to claim 1 , wherein the functional coating is an aqueous composition comprising a platy or hyper-platy kaolin.

9. The article according to claim 1 , wherein the functional coating is an aqueous composition comprising calcium carbonate.

10. The article according to claim 9 , wherein the calcium carbonate is ground calcium carbonate.

11. The article according to claim 1 , wherein the functional coating is an aqueous composition comprising calcium carbonate and kaolin.

12. The article according to claim 11 , wherein the calcium carbonate is ground calcium carbonate.

13. The article according to claim 12 , further comprising styrene-butadiene-acrylonitrile latex.

14. The article according to claim 1 , wherein the functional coating is a liquid barrier layer.

15. The article according to claim 1 , wherein the functional coating is a printed electronics layer.

16. The article according to claim 1 , wherein the functional coating comprises co-processed microfibrillated cellulose and inorganic particulate material composition.

17. The article according to claim 16 , further comprising an additional pigment.

18. The article according to claim 16 , further comprising a latex or a carboxylated latex.

19. The article according to claim 18 , wherein the carboxylated latex is selected from the group consisting of a styrene-butadiene rubber latex; an acrylic polymer latex; a polyvinyl acetate latex; or a styrene acrylic copolymer latex, a starch derivative, a sodium carboxymethyl cellulose, a polyvinyl alcohol, and a protein.

20. The article according to claim 16 , further comprising one or more water retention aid selected from the group consisting of sodium carboxymethyl cellulose, hydroxyethyl cellulose, polyvinyl alcohol, starch, protein, polyacrylate, gums, alginate, polyacrylamide and bentonite.

21. The article according to claim 16 , further comprising one or more viscosity modifier and/or thickener selected from the group consisting of acrylic associative thickener, polyacrylate, emulsion copolymer, dicyanamide, triol, polyoxyethylene ether, urea, sulphated castor oil, polyvinyl pyrrolidone, carboxymethyl cellulose, sodium alginate, xanthan gum, sodium silicate, acrylic acid copolymer, hydroxymethyl cellulose, and hydroxyethyl cellulose.

22. The article according to claim 16 , further comprising one or more lubricity or calendaring aid selected from the group consisting of zinc stearate, wax emulsion, alkyl ketene dimer, glycol, casein, guar gum, calcium stearate, ammonium stearate, and sodium alginate.

23. The article according to claim 16 , further comprising one or more dispersant.

24. The article according to claim 16 , further comprising one or more antifoamer or defoamer.

25. The article according to claim 16 , further comprising one or more optical brightening agent.

26. The article according to claim 16 , further comprising one or more dye.

27. The article according to claim 16 , further comprising one or more biocide.

28. The article according to claim 16 , further comprising one or more leveling agent.

29. The article according to claim 16 , further comprising one or more grease and oil resistance additive.

30. The article according to claim 1 , wherein the microfibrillated cellulose has a d 50 ranging from about 50 μm to about 140 μm.

31. The article according to claim 1 , wherein the microfibrillated cellulose has a d 50 ranging from about 70 μm to about 130 μm.

32. The article according to claim 1 , wherein the microfibrillated cellulose has a d 50 ranging from about 50 μm to about 120 μm.

33. The article according to claim 1 , wherein the microfibrillated cellulose has a d 50 ranging from about 30 μm to about 150 μm.

34. The article according to claim 1 , which comprises a packaging material.

35. The article according to claim 1 , wherein the paper product is a paperboard.