Aqueous-liquid and blood-absorbing powdery reticulated polymers, process for producing the same and their use as absorbents in sanitary articles

US5409771A · kind A · utility

Assignee

• Chemische Fabrik Stockhausen GmbH · DE

Inventors

• Kurt Dahmen · Rheydt, DE
• Richard Mertens · Krefeld, DE

Key dates

• Filing date: Dec 29, 1992
• Grant date: Apr 25, 1995
• Expiry date: Dec 29, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2998
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The present invention relates to a powdery, water-insoluble, cross-linked resin which absorbs aqueous or serous liquids as well as blood and is composed of a) 55 to 99.9%-wt. polymerized, unsaturated, polymerizable, acid-groups-containing monomers which are neutralized to the extent of at least 25 mol-%, b) 0 to 40%-wt. polymerized, unsaturated monomers copolymerizable with a), c) 0.1 to 5.0%-wt. of a cross-linking agent, and d) 0 to 30%-wt. of a water-soluble polymer, whereby the weight amounts a) to d) relate to anhydrous polymer. The polymer is characterized by the fact that the resin powder has been coated with 0.1 to 5%-wt. of an alkylene carbonate, relative to resin powder, and heated to a temperature of 150.degree. to 300.degree. C. The present invention further relates to a method of producing said polymer and to the use thereof in sanitary articles, such as diapers and the like, and in absorbent constructions consisting of hydrophilic fibers and absorbing resin.