Method for producing water-absorbent polymer particles with a higher permeability by polymerising droplets of a monomer solution

US8124229B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Uwe Stueven · Bad Soden, DE
• Matthias Weismantel · Bad Orb, DE
• Wilfried Heide · Freinsheim, DE
• Marco Krüger · Mannheim, DE
• Volker Seidl · Mannheim, DE
• Stefan Blei · Mannheim, DE
• Dennis Loesch · Altrip, DE
• Rüdiger Funk · Niedernhausen, DE
• Annemarie Hillebrecht · Bad Reichenhall, DE

Key dates

• Filing date: Jul 11, 2007
• Grant date: Feb 28, 2012
• Expiry date: May 27, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2982
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets, wherein the monomer solution comprises at least 0.5% by weight of a crosslinker, based on the monomer, the polymerization in the droplet takes place in homogeneous phase, and the polymer beads have a mean diameter of at least 150 μm.