Method for the production of paper, cardboard and card

• Main Authors: KOCH OLIVER, MENKE KNUT, LEDUC MARC, CHAMP SIMON, BLUM RAINER, MERKEL ANDREAS
• Format: Patent
• Language: Chinese; English
• Published: 10.09.2008
• Subjects: IMPREGNATING OR COATING OF PAPER; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

Method for the production of paper, cardboard and card by dewatering a paper stock with sheet formation in the presence of a retention agent system made of (i) at least one vinylamine unit-containing polymer in the form of the free bases, the salts and/or in quaternized form as sole cationic polymer, (ii) at least one linear anionic polymer having a molar mass Mw of at least 1 million and/or at least one branched anionic water-soluble polymer and/or bentonite and/or silica gel and (iii) at least one particulate, anionic, crosslinked, organic polymer having an average particle diameter of at least 1 [mu]m and an intrinsic viscosity of less than 3 dl/g and also use of the retention agent system made of the components (i), (ii) and (iii) as additive in the production of paper, cardboard and card.