Process for preparing color-stable water-absorbing polymer particles with a low degree of neutralization

US7960490B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Rüdiger Funk · Niedernhausen, DE
• Volker Braig · Weinheim, DE

Key dates

• Filing date: Sep 17, 2007
• Grant date: Jun 14, 2011
• Expiry date: Jan 23, 2028

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-absorbing polymeric particles by polymerizing a monomer solution comprising at least one ethylenically unsaturated acid-functional monomer less than 55 mol % neutralized and drying the resulting polymeric gel by means of a heated gas stream in at least two temperature zones.