METHOD FOR FORMING PAPER OR CARDBOARD

A method for the production of paper or cardboard is provide comprising the following steps:(A) Adding a water soluble polymer P to a first aqueous pulp suspension,wherein polymer P is obtainable byPolymerizing to a polymer V of(i) 33 to 83 mol % of a monomer of formula Iin which R1═H or C1-C6 alkyl,(ii) 6 to 56 mol % of diallyl dimethyl ammonium chloride, diallyl diethyl ammonium chloride or a salt form of a monoethylenically unsaturated monomer,(iii) 11 to 61 mol % of a monoethylenically unsaturated carboxylic acid, sulfonic acid or phosphonic acid, or salt forms thereof,(iv) 0 to 50 mol % of one or more ethylenically unsaturated monomers, andhydrolyzing the N-C(═O)R1 groups to form primary amino or amidine groups,(B) dehydrating the second aqueous pulp suspension to a wet paper structure,(C) dehydrating the wet paper structure.