Method of making paper

Abstract

A method of making paper includes adding to an aqueous slurry containing pulp fibers a polymer latex binder that has a copolymer obtained by polymerizing one or more unsaturated monomers and a carbohydrate derived compound having a dextrose equivalent (DE) of 10 to 35. In some implementations, the carbohydrate derived compound can include dextrins, maltodextrins, or mixtures thereof.

1 . A method of making paper, comprising:
 adding to an aqueous suspension containing pulp fibers a polymer latex binder comprising a copolymer obtained by polymerization of one or more unsaturated monomers and a carbohydrate derived compound having a dextrose equivalent (DE) of 10 to 35 to form a mixture of the aqueous suspension and the polymer latex binder; and   removing water from the mixture to form the paper.   
     
     
         2 . The method of  claim 1 , further comprising preparing the polymer latex binder by polymerizing in an aqueous medium a mixture of the one or more unsaturated monomers and the carbohydrate derived compound to produce the copolymer. 
     
     
         3 . The method of  claim 1 , wherein the carbohydrate derived compound is present in an amount of less than 50 wt % based on total monomer weight. 
     
     
         4 . The method of  claim 1 , wherein the carbohydrate derived compound is present in an amount of 5 to 45 wt % based on total monomer weight. 
     
     
         5 . The method of  claim 1 , wherein the copolymer is present in an amount of 2 to 12 wt % of the solids content of the mixture of the aqueous suspension and the polymer latex binder. 
     
     
         6 . The method of  claim 1 , wherein the copolymer comprises a pure acrylic copolymer, a styrene acrylic copolymer, a styrene butadiene copolymer, or a vinyl acrylic copolymer. 
     
     
         7 . The method of  claim 1 , wherein the one or more unsaturated monomers comprise an ethylenically unsaturated monomer. 
     
     
         8 . The method of any of  claim 1 , wherein the carbohydrate derived compound is selected from the group consisting of dextrins, maltodextrins, and mixtures thereof. 
     
     
         9 . The method of  claim 1 , wherein the carbohydrate derived compound has a weight average molecular weight of 3000 to 20,000. 
     
     
         10 . The method of  claim 1 , wherein the carbohydrate derived compound is soluble in water at room temperature in an amount of greater than 40% by weight. 
     
     
         11 . The method of  claim 1 , wherein a solution of the carbohydrate derived compound in an amount of 50% by weight in water at room temperature has a viscosity of 100 to 1000 cps. 
     
     
         12 . The method of  claim 1 , wherein the carbohydrate derived compound has a nonuniformity of 6 to 12. 
     
     
         13 . The method of  claim 1 , wherein the carbohydrate derived compound is chemically modified by etherification or esterification. 
     
     
         14 . The method of  claim 1 , further comprising adding one or more additional binders to the mixture. 
     
     
         15 . The method of  claim 1 , further comprising adding one or more cationic retention aids. 
     
     
         16 . The method of  claim 15 , wherein the one or more cationic aids comprise a polyethyleneimine containing polymer. 
     
     
         17 . The method of  claim 1 , wherein the aqueous suspension has less than 2 wt % solids when the polymer latex binder is added. 
     
     
         18 . The method of  claim 1 , wherein the polymer latex binder is added at a temperature of 40° C. to 80° C. 
     
     
         19 . The method of  claim 1 , wherein the polymer latex binder is added at a temperature of 45° C. to 70° C. 
     
     
         20 . A paper sheet, comprising:
 a matrix of pulp fibers having a copolymer uniformly dispersed throughout, said copolymer derived from one or more unsaturated monomers and a carbohydrate derived compound having a dextrose equivalent (DE) of 10 to 35.