NOVEL PROCESS FOR MANUFACTURING PAPER USING A BASE COPOLYMER THAT HAS REACTED WITH AN ALDEHYDE AS A DRY STRENGTH, RETENTION, DRAINAGE AND RUNNABILITY AID

摘要

Process for manufacturing a sheet of paper and/or of paperboard and the like,according towhich, the cellulosic material is brought into contact with at least one drystrength aid,characterized in that said dry strength aid is a cationic or amphoteric(co)polymer derivedfrom the reaction between at least one aldehyde and at least one base(co)polymer comprisingat least one nonionic monomer, said base copolymer being modified with atleast onepolyfunctional compound comprising at least three heteroatoms chosen from N,S, O and P,in which at least three of these heteroatoms each have at least one mobilehydrogen.