| abstract |
[Problem] To provide a low-density agent for paper and a method for producing low-density paper, which can easily produce low-density paper having excellent density reduction, opacity and whiteness and low water content elongation. A low density for paper comprising a polyamide compound obtained by amidation reaction of a polyamine, a polyvalent carboxylic acid or polyvalent carboxylic acid anhydride and a fatty acid having 12 to 36 carbon atoms, or a salt thereof. A method for producing low-density paper, characterized in that a pulp used for producing a paper and a paper is treated with the paper low-density agent. [Selection figure] None |