Powder-form cross-linked polymers capable of absorbing aqueous liquids and body fluids, method of preparing them and their use

US5712316A · kind A · utility

Assignee

• Chemische Fabrik Stockhausen GmbH · DE

Inventors

• Kurt Dahmen · Rheydt, DE
• Edgar Herrmann · Salem, US
• Klaus Pfluger · Krefeld, DE

Key dates

• Filing date: Jan 11, 1996
• Grant date: Jan 27, 1998
• Expiry date: Jan 11, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F291/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to powdery, water-swellable, cross-linked polymers having a high absorption capacity for aqueous liquids, in particular body fluids, under load, which polymers are formed of: PA1 a) 55-99.9%-wt. acid-groups-containing monomers which are neutralized to the extent of at least 50 mole-%, PA1 b) 0-40%-wt. of monomers which are copolymerizable with a), PA1 c) 0.1-5.0%-wt. of at least one cross-linking agent, PA1 d) 0-30%-wt. of a water-soluble polymer. The cations of the salts according to a) are Li.sup.+, Na.sup.+, preferably K.sup.+, Cs.sup.+, Rb.sup.+, as well as primary, secondary, and tertiary methyl ammonium ions, either alone or in combination. The polymers are manufactured in that a blowing agent based on carbon dioxide is added to the monomers, followed by polymerization, that the polymer is dried and then heated to a temperature of 100.degree.-300.degree. C. with one or several compounds which are reactive for surface cross-linkage. These polymers are suitable as component in sanitary articles which absorb body fluids and in wound dressings, as component in diapers, sanitary napkins, and incontinence articles, as component in current-conducting an…