A fluorochemical-free grease-barrier paper

Abstract

The present disclosure provides a fluorochemical-free grease barrier paper comprising a base paper, wherein: a first side of the base paper is impregnated with a first composition comprising oxidized starch, dextrin, a crosslinker and a wax, such as alkyl ketene dimer (AKD); and a second side of the base paper is impregnated with a second composition comprising oxidized starch, dextrin and a crosslinker.

1 . A fluorochemical-free grease barrier paper comprising a base paper, wherein:
 a first side of the base paper is impregnated with a first composition comprising oxidized starch, dextrin, a crosslinker and a wax; and   a second side of the base paper is impregnated with a second composition comprising oxidized starch, dextrin and a crosslinker.   
     
     
         2 . The barrier paper of  claim 1 , wherein the base paper comprises a mixture of hardwood fibers and softwood fibers. 
     
     
         3 . The barrier paper of  claim 2 , wherein the dry weight ratio of hardwood fibers to softwood fibers is between 1:1 and 1:3. 
     
     
         4 . The barrier paper of  claim 3 , wherein the dry weight ratio of hardwood fibers to softwood fibers is between 1:1.2 and 1:2.0. 
     
     
         5 . The barrier paper of  claim 1 , wherein the crosslinker is a PAE resin. 
     
     
         6 . The barrier paper of  claim 1 , wherein the amount of the crosslinker in the first composition is 1-9%, based on the dry weight of starch. 
     
     
         7 . The barrier paper of  claim 1 , wherein the amount of the crosslinker in the second composition is 1-9%, based on the dry weight of starch. 
     
     
         8 . The barrier paper of  claim 1 , wherein the amount of AKD in the first composition is 1-9%, based on the dry weight of starch. 
     
     
         9 . The barrier paper of  claim 1 , wherein at least 75%, of the dry weight of the first composition is starch. 
     
     
         10 . The barrier paper of  claim 1 , wherein at least 80%, of the dry weight of the second composition is starch. 
     
     
         11 . The barrier paper of  claim 1 , wherein the dry amount of the first composition is 0.4-1.5 g/m 2 . 
     
     
         12 . The barrier paper of  claim 1 , wherein the dry amount of the second composition is 0.4-1.5 g/m 2 . 
     
     
         13 . The barrier paper of  claim 1 , wherein the ash content is 3-9%. 
     
     
         14 . The barrier paper of  claim 1 , wherein the basis weight measured according to ISO 536:2019 is 30-65 g/m 2 . 
     
     
         15 . The barrier paper of  claim 1 , wherein the Gurley value measured according to ISO 5636-5:2013 is at least 400 s. 
     
     
         16 . The barrier paper of  claim 1 , wherein said dextrin is maltodextrin. 
     
     
         17 . The barrier paper of  claim 1 , wherein the wax is alkyl ketene dimer (AKD). 
     
     
         18 . The barrier paper of  claim 1 , wherein the amount of the crosslinker in the first composition is 3-7%, based on the dry weight of starch. 
     
     
         19 . The barrier paper of  claim 1 , wherein the amount of AKDf in the first composition is 2-7%, based on the dry weight of starch. 
     
     
         20 . The barrier paper of  claim 1 , wherein the dry amount of the first composition is 0.6-1.4 g/m 2 , and the dry amount of the second composition is 0.6-1.4 g/m 2 .