Method for producing paper, paperboard and cardboard using an uncrosslinked fixing agent during paper stock draining

US6576086B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Roland Ettl · Haßloch, DE
• Hubert Meixner · Ludwigshafen, DE
• Anton Esser · Mannheim, DE
• Rainer Scholz · Amberg, DE
• Norbert Mahr · Schifferstadt, DE
• Ulrich Steuerle · Heidelberg, DE
• Matthias Hone · Nümbrecht, DE
• Klaus Lorenz · Worms, DE

Key dates

• Filing date: Nov 2, 1999
• Grant date: Jun 10, 2003
• Expiry date: Nov 2, 2019

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H21/16
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

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.