Production of paper, board and cardboard

• Main Authors: MATTHIAS HOENE KLAUS LORENZ, ANTON ESSER, ULRICH STEUERLE, HUBERT MEIXNER, RAINER SCHOLZ NORBERT MAHR, ROLAND ETTL
• Format: Patent
• Language: English
• Published: 15.11.1999
• Edition: 6
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; IMPREGNATING OR COATING OF PAPER; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

Paper, board and cardboard are produced by draining paper stock containing interfering substances in the presence of fixing agents by a process in which the fixing agents used are reaction products which are obtainable by reacting amino- and/or ammonium-containing polymers selected from the group consisting of thepolymers containing vinylamine unitspolyalkylene polyaminespolyamidoaminesethyleneimine-grafted polyamidoamines which may be crosslinked,polydiallyldimethylammonium chloridespolymers containing dialkylaminoalkylacrylamide units or dialkylaminoalkylmethacrylamide units andpolyallylamines anddicyandiamide and formaldehyde condensateswith reactive sizes for paper in a weight ratio of polymer to reactive size of from 15,000:1 to 1:1, and the reaction products thus obtainable are used as fixing agents for water-soluble and for water-insoluble interfering substances in the production of paper, board and cardboard from paper stocks containing interfering substances.