Improving the water absorption capacity of crosslinked, water-swellable polymers

US5180804A · kind A · utility

Assignee

• BASF SE

Inventors

• Manfred Niessner · Schifferstadt, DE
• Juergen Beck · Mannheim, DE
• Heinrich Hartmann · Schifferstadt, DE
• Andreas Kemna · Goleta, US
• Stefan Wickel · Ludwigshafen, DE

Key dates

• Filing date: Aug 8, 1990
• Grant date: Jan 19, 1993
• Expiry date: Aug 8, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F6/008
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The water absorption capacity of crosslinked, water-swellable polymers is improved by a process in which a water-containing, finely divided polymer gel having a solids content of from 20 to 65% by weight is treated with steam at not less than 50.degree. C., the solids content of the water-containing polymer gel increasing by not more than 30% by weight, and the polymer gel is then dried in a conventional manner.