PAPER DURABILITY PROMOTER, METHOD FOR PRODUCING PAPER DURABILITY PROMOTER, PAPER AND METHOD FOR PRODUCING PAPER

摘要

PROBLEM TO BE SOLVED: To provide a paper durability promoter having excellent storage stability though having a high molecular weight, also, unreacted (meth)acrylamide is reduced, and further, upon addition to raw material pulp, the tone of paper is not disturbed by over-flocculation while being fixed to the pulp, and exhibiting an excellent paper durability effect as well, a method for producing the paper durability promoter, paper containing the paper durability promoter, and a method for producing the paper.;SOLUTION: There is provided a paper durability promoter containing, as polymerization components (A), (meth)acrylamide (a1), a cationic vinyl monomer (a2), an anionic vinyl monomer (a3) and a crosslinking vinyl monomer (a4), and containing a copolymer (B) in which the weight average molecular weight (Mw) is 1,000,000 to 8000,000 and a molecular weight distribution (Mw/Mn) is 1.5 to 3.0, also provided is a method for producing the paper durability promoter, also provided is paper containing the paper durability promoter, and also provided is a method for producing the paper.;SELECTED DRAWING: None;COPYRIGHT: (C)2018,JPO&INPIT