Process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution

US8450428B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Thomas Daniel · Waldsee, DE
• Marco Krüger · Mannheim, DE
• Karin Flore · Monsheim, DE
• Stefan Blei · Mannheim, DE
• Uwe Stueven · Bad Soden, DE
• Norbert Herfert · Charlotte, US
• Michael A. Mitchell · Fort Mill, US

Key dates

• Filing date: Mar 23, 2011
• Grant date: May 28, 2013
• Expiry date: Jul 12, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F222/103
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, which comprises thermal postcrosslinking in the presence of steam.