Method of producing water-soluble nonturbid copolymers of at least one water-soluble N-vinyllactam and at least one hydrophobic comonomer

US7449531B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Rainer Dobrawa · Stuttgart, DE
• Ralf Widmaier · Mannheim, DE
• Eberhard Schupp · Schwetzingen, DE
• Klaus Schnell · Neustadt, DE
• Martin Meister · Bocholt, DE

Key dates

• Filing date: Dec 22, 2006
• Grant date: Nov 11, 2008
• Expiry date: Dec 22, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F216/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Method of producing vinyllactam copolymers by free-radical polymerization of at least one water-soluble N-vinyllactam and at least one hydrophobic comonomer in an organic solvent in the presence of an initiator under reflux conditions, where the condensate formed in the reflux is returned to the polymerization mixture from below.