Production of paper, board and cardboard

US5145559A · kind A · utility

Assignee

• BASF SE

Inventors

• Werner Auhorn · Bischofswerda, DE
• Friedrich Linhart · Heidelberg, DE
• Primoz Lorencak · Ludwigshafen, DE
• Michael Kroener · Mannheim, DE
• Norbert Sendhoff · Havelsee, DE
• Walter Denzinger · Speyer, DE
• Heinrich Hartmann · Schifferstadt, DE

Key dates

• Filing date: Jan 16, 1991
• Grant date: Sep 8, 1992
• Expiry date: Jan 16, 2011

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H17/34
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Paper, board and cardboard are produced by draining a paper stock, containing undesirable substances, in the presence of hydrolyzed homo- and/or copolymers of N-vinylformamide having a degree of hydrolysis of not less than 60% and a cationic retention aid. According to the invention, faster drainage and improved retention are obtained compared with the use of known fixing agents.