Production of paper, board and cardboard

US4772359A · kind A · utility

Assignee

• BASF SE

Inventors

• Friedrich Linhart · Heidelberg, DE
• Hans-Juergen Degen · Lorsch, DE
• Werner Auhorn · Bischofswerda, DE
• Michael Kroener · Mannheim, DE
• Heinrich Hartmann · Schifferstadt, DE
• Wilfried Heide · Freinsheim, DE

Key dates

• Filing date: May 29, 1987
• Grant date: Sep 20, 1988
• Expiry date: May 29, 2007

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H17/37
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Paper, board and cardboard are produced by draining a pulp slurry in the presence of high molecular weight, water-soluble polymers of N-vinylamides as drainage aids, retention agents and flocculants. These polymers are particularly effective in a pulp slurry which has a high content of interfering substances and other phenolic compounds.