Absorbent polymer modification

US6479593B2 · kind B2 · utility

Assignee

• HUNTSMAN PETROCHEMICAL LLC · US

Inventors

• John H. Clements · Diemelstraße, US
• Howard P. Klein · Houston, US
• Edward T. Marquis · Austin, US
• James R. Machac, Jr. · Austin, US
• Katty Darragas · Oudenaarde, BE

Key dates

• Filing date: Sep 10, 2001
• Grant date: Nov 12, 2002
• Expiry date: Sep 10, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2810/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Provided herein are cross-linked super absorbing polymers made by reacting a copolymer having an esterifiable acid group with a cyclic alkylene carbonate. The resulting cross-linked materials have an increased ability to retain absorbed liquids even under the influence of applied stress. Catalysts are also disclosed which are useful in promoting the reaction between the alkylene carbonate and copolymer.