Method for producing water-absorbing polymer particles with high swelling rate and high centrifuge retention capacity with simultaneously high permeability of the swollen gel bed

US9822203B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Monica Haag · Ludwigshafen, DE
• Roland Krauss · Neustadt, DE
• Thomas Gieger · Ludwigshafen, DE
• Volker Klock · Ludwigshafen, DE
• Matthias Weismantel · Bad Orb, DE

Key dates

• Filing date: Jan 20, 2014
• Grant date: Nov 21, 2017
• Expiry date: Jan 20, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2333/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for producing water-absorbing polymer particles having high free swell rate and high centrifuge retention capacity with simultaneously high permeability of the swollen gel bed by polymerization of an aqueous monomer solution in a polymerization reactor having at least two shafts (kneaders) which rotate in an axially parallel manner, subsequent extrusion at high temperatures and thermal surface postcrosslinking.