Compositions

Abstract

Compositions such as filled and coated papers may include microfibrillated cellulose and inorganic particulate material.

1 - 26 . (canceled) 
     
     
         27 . A paper product comprising a co-processed microfibrillated cellulose and inorganic particulate material composition, wherein the paper product has:
 i) a first tensile strength greater than a second tensile strength of the paper product devoid of the co-processed microfibrillated cellulose and inorganic particulate material composition;   ii) a first tear strength greater than a second tear strength of the paper product devoid of the co-processed microfibrillated cellulose and inorganic particulate material composition; and/or   iii) a first burst strength greater than a second burst strength of the paper product devoid of the co-processed microfibrillated cellulose and inorganic particulate material composition; and/or   iv) first sheet light scattering coefficient greater than a second sheet light scattering coefficient of the paper product devoid of the co-processed microfibrillated cellulose and inorganic particulate material composition; and/or   v) a first porosity less than a second porosity of the paper product devoid of the co-processed microfibrillated cellulose and inorganic particulate material composition; and/or   vi) a first z-direction (internal bond) strength greater than a second z-direction (internal bond) strength of the paper product devoid of the co-processed microfibrillated cellulose and inorganic particulate material composition.   
     
     
         28 . The paper product of  claim 27 , further comprising a paper coating composition which comprises a functional coating for liquid packaging, barrier coatings, or printed electronics applications. 
     
     
         29 . The paper product of  claim 27 , further comprising a second coating comprising a polymer, a metal, an aqueous composition, or a combination thereof. 
     
     
         30 . The paper product of  claim 27 , further having a first moisture vapour transmission rate (MVTR) lower than a second MVTR of the paper product devoid of the co-processed microfibrillated cellulose and inorganic particulate material composition. 
     
     
         31 . The paper product of  claim 27 , wherein the paper comprises from about 0.5 wt. % to about 50 wt. % of the co-processed microfibrillated cellulose and inorganic particulate material composition. 
     
     
         32 . The paper product of  claim 27 , wherein the paper comprises from about 25 wt. % to about 35 wt. % of the co-processed microfibrillated cellulose and inorganic particulate material composition. 
     
     
         33 . The paper product of  claim 27 , which is coated with a paper coating composition, where the coated paper product has a first gloss greater than a second gloss of the coated paper product devoid of the co-processed microfibrillated cellulose and inorganic particulate material composition. 
     
     
         34 . The paper product of  claim 27 , further comprising a coating composition which comprises a co-processed microfibrillated cellulose and inorganic particulate material composition. 
     
     
         35 . The paper product of  claim 34 , wherein the inorganic particulate material composition of the coating composition is kaolin. 
     
     
         36 . The paper product of  claim 27 , further comprising one or more functional coatings on the paper product. 
     
     
         37 . The paper product of  claim 36 , wherein the one or more functional coatings is a polymer, a metal, an aqueous composition, or a combination thereof. 
     
     
         38 . The paper product of  claim 36 , wherein the one or more functional coatings is a liquid barrier layer. 
     
     
         39 . The paper product of  claim 36 , wherein the functional coating is a printed electronics layer. 
     
     
         40 . A papermaking composition comprising a co-processed microfibrillated cellulose and inorganic particulate material composition, wherein the papermaking composition has:
 (i) a first cationic demand lower than a second cationic demand of the papermaking composition devoid of the co-processed microfibrillated cellulose and inorganic particulate material composition; and/or   (ii) a first, first-pass retention greater than a second, first-pass retention of the papermaking composition devoid of the co-processed microfibrillated cellulose and inorganic particulate material composition; and/or   (iii) a first ash retention greater than a second ash retention of the papermaking composition devoid of the co-processed microfibrillated cellulose and inorganic particulate material composition.   
     
     
         41 . A papermaking composition comprising a co-processed microfibrillated cellulose and inorganic particulate material composition, wherein the papermaking composition is substantially devoid of retention aids. 
     
     
         42 . A paper product comprising a co-processed microfibrillated cellulose and inorganic particulate material composition, wherein the paper product has a first formation index lower than a second formation index of the paper product devoid of the co-processed microfibrillated cellulose and inorganic particulate material composition. 
     
     
         43 . The paper product of  claim 27 , wherein the inorganic particulate material comprises an alkaline earth metal carbonate or sulphate, such as calcium carbonate, magnesium carbonate, dolomite, gypsum, a hydrous kandite clay such as kaolin, halloysite or ball clay, an anhydrous (calcined) kandite clay such as metakaolin or fully calcined kaolin, talc, mica, huntite, hydromagnesite, ground glass, perlite or diatomaceous earth, or combinations thereof. 
     
     
         44 . The paper product of  claim 27 , wherein the microfibrillated cellulose has a d 50  ranging from about 25 μm to about 250 μm, more preferably from about 30 μm to about 150 μm, even more preferably from about 50 μm to about 140 μm, still more preferably from about 70 μm to about 130 μm, and most preferably from about 50 μm to about 120 μm. 
     
     
         45 . The paper product of  claim 27 , wherein the microfibrillated cellulose has a monomodal particle size distribution. 
     
     
         46 . The paper product of  claim 27 , wherein the microfibrillated cellulose has a multimodal particle size distribution.