Method for the stabilization of polyvinylpyrrolidones

US8524827B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Karl Kolter · Ludwigshafen am Rhein, DE
• Ivette Garcia Castro · Ludwigshafen, DE
• Olga Pinneker · Heßheim, DE
• Ralf Widmaier · Mannheim, DE
• Karl-Hermann Strube · Speyer, DE
• Bernhard Fussnegger · Edenkoben, DE
• Manfred Kroll · Ludwigshafen, DE
• Frank Höfer · Bad Dürkheim, DE
• Hermann Ascherl · Dirmstein, DE
• Peter Schmidt · Bad Dürkheim, DE

Key dates

• Filing date: Feb 8, 2006
• Grant date: Sep 3, 2013
• Expiry date: Mar 25, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L39/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Method for stabilizing polyvinylpyrrolidones, which comprises treating the polyvinylpyrrolidones with sulfur dioxide, sulfurous acid or alkali metal sulfites and then with free-radical scavenger, and converting the solutions treated in this way into the powdered polyvinylpyrrolidones by drying.