Retention improving composition

摘要: A novel retention aid is provided, which can realizes not only high but also excellent paper formation and easy to use, in various papermaking processes. composition for improving comprises (A) a cationic water-soluble polymer (B) an amphoteric polymer. The component preferably copolymer having cation equivalent of 0.05 4.00 meq/g or one 0.5% salted viscosity 30 200 mPa·s. either comprising radical-polymerizable monomer unit, anionic nonionic obtained by polymerizing with the presence polysaccharide. From standpoint attaining formation, has molar proportion unit (hereinafter referred as Ca/An) satisfying Ca/An<1.2.