Paper-sizing agents containing aqueous, solvent-free dispersions of cationic polymers and method of preparing sized paper by using these agents

US5954921A · kind A · utility

Assignee

• Stockhausen GmbH & Co. KG · DE

Inventors

• Kurt Dahmen · Rheydt, DE
• Richard Mertens · Krefeld, DE
• Thomas Muller · Bad Homburg vor der Höhe, DE
• Johann Schulte · Krefeld, DE

Key dates

• Filing date: Feb 25, 1997
• Grant date: Sep 21, 1999
• Expiry date: Feb 25, 2017

Classification

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

Abstract

The present invention relates to agents for the pulp and/or surface sizing of paper, which comprise aqueous, solventless dispersions of cationic polymers, and to a process for sizing paper by using said agent. The sizing agents according to the present invention which can be used both in pulp and surface sizing obtain as active substance copolymers of PA1 a) 30-70 mole-% of a monomer I with PA1 b) 70-30 mole-% of a monomer II, and optionally PA1 c) 0-20 mole-% of C.sub.8 -C.sub.30 monoolefins, and PA1 d) 0-10 mole-% of further monomers copolymerizable with a), b), and optionally c), the sum of monomers a), b), c), and d) amounting to 100 mole-%.