NOVEL METHOD FOR PRODUCING PAPER IMPLEMENTING A BASE COPOLYMER HAVING REACTED WITH AN ALDEHYDE AS A DRY STRENGTH, RETENTION, DRAINAGE AND MACHINABILITY AGENT

摘要

A method for producing a sheet of paper and/or cardboard and the like, according to which the cellulosic material is brought into contact with at least one dry strength agent, characterised in that said agent is a cationic or amphoteric (co)polymer resulting from the reaction between at least one aldehyde and at least one base (co)polymer comprising at least one non-ionic monomer, said base copolymer being previously modified with at least one polyfunctional compound comprising at least 3 heteroatoms chosen from N, S, O, P, whereof at least 3 of said heteroatoms each have at least one mobile hydrogen atom.