Process for preparing polymers in powder form

US4135043A · kind A · utility

Assignee

• BASF SE

Inventors

• Bernd Kast · Ludwigshafen, DE
• Joachim Stedefeder · Lampertheim, DE
• Axel Sanner · Bischofswerda, DE
• Hans-Uwe Schenck · Monsheim, DE
• Richard Thoma · Battenberg, DE
• Hermann Fischer · Augsburg, DE

Key dates

• Filing date: Aug 1, 1977
• Grant date: Jan 16, 1979
• Expiry date: Aug 1, 1997

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/909
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polymers in powder form are manufactured by polymerizing water-soluble ethylenically unsaturated monomers, which form hydrophilic polymers, in a powder bed of polymers of water-soluble ethylenically unsaturated compounds in the presence of polymerization initiators and water as an auxiliary liquid, the water being entirely or partially removed from the polymerization zone by evaporation during the polymerization.