Method for the secondary crosslinking of hydrogels with bicyclic amide acetals

US7754822B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Thomas Daniel · Waldsee, DE
• Ulrich Riegel · Landstuhl, DE
• Mark Elliott · Ludwigshafen, DE
• Ubbo von Oehsen · Seelow, DE
• Kai Michael Exner · Eppelheim, DE
• Klemens Massonne · Bad Dürkheim, DE

Key dates

• Filing date: Jul 7, 2004
• Grant date: Jul 13, 2010
• Expiry date: Aug 18, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S493/96
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for postcrosslinking a water-absorbing polymer comprises said polymer being treated with a postcrosslinker and, during or after said treating, being postcrosslinked and dried by temperature elevation, said postcrosslinker being a compound of the formula Iwhere R1, R2, R3, R4, R5, R6, R7, R8 and R9 are each independently hydrogen, C1-C12-alkyl, C2-C12-alkenyl or C6-C12-aryl, wherein C1-C12-alkyl, C2-C12-alkenyl or C6-C12-aryl may be halogen substituted. The liquid-absorbing polymers are useful in hygiene articles and packaging materials.