Use of vinylamine polymers with ionic, organic, cross-linked polymeric microbeads in paper-making

Abstract

A method for making paper is disclosed. The method comprising adding to a furnish comprising cellulosic, paper-making fibers (i) from about 0.05 to about 20 pounds per ton, based upon the dry weight of the furnish solids, of an ionic, organic, crosslinked polymeric microbead with a diameter of less than about 500 nm, and (ii) from about 0.05 to about 20 pounds per ton, same basis, of a polymeric material, containing vinylamine recurring units. In addition to the compositions described above, additives such as organic ionic, polysaccharides (e.g., a starch), may also be combined with the liquid system to facilitate drainage and retention.

We claim:  
     
         1 . A method for making a filled or unfilled paper which comprises adding to an aqueous paper-making furnish (i) from about 0.05 to about 20 pounds per ton, based on the dry weight of the furnish solids, of an ionic, organic, cross-linked polymeric microbead and (ii) from about 0.05 to about 20 pounds per ton, same basis, of a polymeric material, or salt or quaternary thereof, having the formula  
       
         
           
           
               
               
           
         
       
       wherein each R or R 1 , individually, is hydrogen, or a C 1 -C 3  alkyl group, X is the polymerization residue of a copolymerzable monmer or hydrolyzed derivative thereof and mixtures thereof, x and z are, individually, minerals ranging from about 0 to about 99 and y is a numeral ranging from about 1 about 100.  
     
     
         2 . The method of  claim 1  wherein the furnish is a filled alkaline aqueous paper furnish.  
     
     
         3 . The method of  claim 2  wherein the furnish is filled with calcium carbonate or a mixture thereof with another filler.  
     
     
         4 . The method of  claim 1  wherein the microbeads have a diameter of less than about 500 nm.  
     
     
         5 . The method of  claim 4  wherein the diameter of said microbeads is between about 25-300 nm.  
     
     
         6 . The method of  claim 1  wherein x and z, are, individually, numerals ranging from about 0 to about 95 and y is a numeral ranging from about 5 to about 100.  
     
     
         7 . The method of  claim 1  wherein x and z, are, individually, numerals ranging from about 0 to about 75 and y is a numeral ranging from about 25 to about 100.  
     
     
         8 . The method of  claim 1  wherein R is hydrogen and y is 100.  
     
     
         9 . The method of  claim 8  wherein the polymeric material is a salt.  
     
     
         10 . Paper produced by the method of  claim 1 .  
     
     
         11 . The method of  claim 2  wherein both the microbeads are the polymeric material are cationic.  
     
     
         12 . The method of  claim 11  wherein the microbead and the polymeric material have opposite charges.  
     
     
         13 . The method of  claim 12  wherein the microbeads are anionic and the polymeric material is cationic.  
     
     
         14 . The method of  claim 13  wherein x and z are, individually, numerals ranging from about 0 to about 95 and y is a numeral ranging from about 5 to about 100.  
     
     
         15 . The method of  claim 13  wherein x and z are, individually, numerals ranging from about 0 to about 75 and y is a numeral ranging from about 25 to about 100.  
     
     
         16 . The method of  claim 13  wherein R is hydrogen and y is 100.  
     
     
         17 . The method of  claim 13  wherein the polymeric material is a salt.  
     
     
         18 . The method of  claim 1  which further comprises additionally adding to said furnish from about 1.0 to about 50 pounds per ton, based on the dry weight of said furnish solids, of an organic ionic polysaccharide.