Method for removal of residual monomers from water-absorbing polymer particles

US9434802B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Stephan Bauer · Ostercappeln, DE
• Norbert Herfert · Charlotte, US
• Lydia König · Speyer, DE
• Yvonne Hagen · Waldsee, DE
• Xiana Romani Fernandez · Karlsruhe, DE
• Marcus Schöppler · Altlußheim, DE

Key dates

• Filing date: Jan 20, 2014
• Grant date: Sep 6, 2016
• Expiry date: Jan 20, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2312/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for removing residual monomers from water-absorbing polymer particles by thermally aftertreating the water-absorbing polymer particles in a mixer with rotating mixing tools at a temperature of at least 60° C. in the presence of water and of a surfactant.