Softening agent for paper and method for making paper by using same
A paper softening composition that is capable of providing paper with excellent flexibility while suppressing decrease in paper strength. The paper softening composition contains a specific diamide diamine compound or a salt thereof and a specific amide amine compound or a salt thereof in a mass ratio of 5/95 to 90/10.
1. A paper softening composition comprising:
a diamide diamine compound or a salt thereof represented by formula (1):
wherein the chain portion A is a residue of a dicarboxylic acid having 4 to 12 carbon atoms; R 1 , R 2 , R 5 , and R 6 are each an alkyl group having 1 to 4 carbon atoms; and R 3 and R 4 are each an alkylene group having 2 to 4 carbon atoms; and
an amide amine compound or a salt thereof represented by formula (2):
wherein R 7 CO is an acyl group having 10 to 24 carbon atoms; R 8 is an alkylene group having 2 to 4 carbon atoms; and R 9 and R 10 are each an alkyl group having 1 to 4 carbon atoms;
the mass ratio of diamide diamine component to amide amine component being in the range of 5/95 to 90/10.
2. A method for manufacturing paper, characterized by adding 0.06 to 8 parts by mass of the paper softening composition according to claim 1 per 100 parts by mass of pulp.