Surface cross-linked superabsorbent polymer particles and methods of making them

US7871640B2 · kind B2 · utility

Assignee

• The Procter & Gamble Company · US

Inventors

• Andreas Flohr · Kronberg, DE
• Torsten Lindner · Schwalbach am Taunus, DE

Key dates

• Filing date: Aug 7, 2009
• Grant date: Jan 18, 2011
• Expiry date: Aug 7, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2333/02
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Superabsorbent polymer particles with improved surface cross-linking and their use in absorbent articles. The superabsorbent polymer particles comprise polymer chain segments, wherein at least a part of the polymer chain segments are covalently cross-linked to each other and wherein at least a part of the cross-links include the reaction product of cross-linking molecules having at least two C═C double bonds and further include the reaction product of radical former molecules. These cross-links are present at surfaces of the superabsorbent polymer particles.