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

US9790304B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Thomas Daniel · Waldsee, DE
• Norbert Herfert · Charlotte, US
• Stephan Bauer · Ostercappeln, DE
• Katrin Baumann · Mannheim, DE
• Birgit Reinhard · Schifferstadt, DE
• Jürgen Freiberg · Lampertheim, DE
• Rudolf Schliwa · Alzenau, DE

Key dates

• Filing date: Nov 11, 2013
• Grant date: Oct 17, 2017
• Expiry date: Mar 26, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29B2009/168
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution comprising less than 0.3% by weight of persulfate and at least 0.05% by weight of azo initiator and thermal aftertreatment of the formed polymer particles at less than 100° C. in a fluidized bed for 60 to 300 minutes.