Water-swellable composition, synthesis and use thereof

US4795762A · kind A · utility

Assignee

• Akzo N.V. · NL

Inventors

• Michael Diamantoglou · Zell am Harmersbach, DE
• Christoph Josefiak · Rimbach, DE
• Helmut Magerlein · Obernburg, DE

Key dates

• Filing date: Apr 16, 1987
• Grant date: Jan 3, 1989
• Expiry date: Apr 16, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2810/50
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A new water-swellable composition of a gelling agent based on hydrolyzed homo- or copolymers of acrylonitrile and of an inert metal oxide was synthesized. In the process, 1 to 22% of the nitrile groups were saponified to amide groups and 99 to 78% to alkali-metal salts. The obtained composition had a spongy structure and was characterized by high values with regard to both swelling capacity and swelling rate. Therefore it is particularly suitable for diaper manufacture and for agricultural use.