Removal of vinylpyrrolidone from vinylpyrrolidone polymers

US4795802A · kind A · utility

Assignee

• BASF SE

Inventors

• Adolf Nuber · Böhl-Iggelheim, DE
• Axel Sanner · Bischofswerda, DE
• Dieter Urban · Speyer, DE

Key dates

• Filing date: Aug 6, 1987
• Grant date: Jan 3, 1989
• Expiry date: Aug 6, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F6/003
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Vinylpyrrolidone is removed from its polymers by a process in which an aqueous or alcoholic solution of the polymer is treated with an adsorbent, the adsorbents used preferably being active carbon, zeolites and especially acidic ion exchangers.