Method for producing white and color-stable water-absorbing polymer particles having high absorbency and high saline flow conductivity

US8314173B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ulrich Riegel · Landstuhl, DE
• Thomas Daniel · Waldsee, DE
• Uwe Stueven · Bad Soden, DE
• Mark Elliott · Ludwigshafen, DE
• Volker Braig · Weinheim, DE
• Michael de Marco · Weinheim, DE

Key dates

• Filing date: Jan 29, 2008
• Grant date: Nov 20, 2012
• Expiry date: Sep 24, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/13
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Water-absorbing polymeric particles are produced by polymerizing a monomer solution or suspension comprising at least one unsaturated carboxylic acid and at least one hydroquinone monoether, and coating the polymeric particles with at least one salt of a tervalent metal cation of a carboxylic acid and/or at least one basic salt of a tervalent metal cation.