Bulky paper

Abstract

Provide a bulky paper that provides improved paper-strength properties such as higher tensile strength without increasing paper density, while also offering good optical characteristics such as opacity and brightness, wherein the paper is produced by: (a) blending polyacrylamides that have an electric charge of 2.0 m-equivalent/g or less at pH2 and also 2.0 m-equivalent/g or less at pH12; (b) adding fillers comprising amorphous silica or silicate with a specific bulk density of 0.3 g/ml or less, bulk-increasing agents comprising fatty-acid polyamide compound or of ester compound of polyhydric alcohol and fatty acid, and/or mercerized pulps or bridged pulps; and (c) adjusting the relative bonding area of the paper containing polyacrylamides to 1.2 times the relative bonding area of a paper not containing polyacrylamides, or less.

1 . A bulky paper comprising polyacrylamide which has an electric charge of 2.0 m-equivalent/g or less at pH2 and also 2.0 m-equivalent/g or less at pH12.  
     
     
         2 . The bulky paper as described in  claim 1 , further comprising an amorphous silica or amorphous silicate with a specific bulk density of 0.3 g/ml or less as a filler.  
     
     
         3 . The bulky paper as described in  claim 1 , further comprising a bulk-increasing agent comprising a fatty-acid polyamide compound or a bulk-increasing agent comprising an ester compound of a polyhydric alcohol and a fatty acid.  
     
     
         4 . The bulky paper as described in  claim 1 , further comprising a mercerized pulp or bridged pulp.  
     
     
         5 . The bulky paper as described in  claim 1 , wherein a relative bonding area of said paper containing polyacrylamide is 1.2 times a relative bonding area of a paper not containing polyacrylamide, or less.  
     
     
         6 . The bulky paper as described in  claim 2 , wherein a relative bonding area of said paper containing polyacrylamide is 1.2 times a relative bonding area of a paper not containing polyacrylamide, or less.  
     
     
         7 . The bulky paper as described in  claim 3 , wherein a relative bonding area of said paper containing polyacrylamide is 1.2 times a relative bonding area of a paper not containing polyacrylamide, or less.  
     
     
         8 . The bulky paper as described in  claim 4 , wherein a relative bonding area of said paper containing polyacrylamide is 1.2 times a relative bonding area of a paper not containing polyacrylamide, or less.