PRODUCTION OF PAPER AND BOARD

• Main Authors: HAMERS Christoph, WUERFEL Hendryk, ESSER Anton, MEIXNER Hubert, SPANGE Stefan, TROMMLER Katja, WALTHER Tina, SCHALL Norbert, HAEHNLE Hans-Joachim, BUCHAN Matthew, SEIFERT Susan
• Format: Patent
• Language: English
• Published: 21.12.2017
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CORRECTING FLUIDS; DYES; FILLING PASTES; IMPREGNATING OR COATING OF PAPER; INKS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; POLISHES; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; USE OF MATERIALS THEREFOR; WOODSTAINS

The invention relates to a method for producing paper or cardboard, which comprises adding (I) an aqueous composition having a pH ≤6 and (II) at least one water-soluble polymeric anionic compound to a paper stock having a pH in the range from 6 to 8, and then dewatering the paper stock, forming sheets and drying, where the aqueous composition comprises (a) polymers having primary amino groups and/or amidine groups, with a total content of these groups of ≥1.5 meq/g polymer, and (b) 0.01 to 50 mol% of 1,4-cyclohexanedione (b), based on the total amount of primary amino groups and/or amidine groups in the polymers, and also to the paper or cardboard produced accordingly.