The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 1995
Filed:
Feb. 01, 1994
Chemische Fabrik Stockhausen GmbH, Krefeld, DE;
Abstract
The invention relates to a cross-linked, water-absorbent polymer obtainable by the polymerization of a mixture consisting of a) 60-99%-wt. unsaturated, polymerizable monomers with acid groups which are neutralized to the extent of at least 30 mol-%, b) 0-37%-wt. monomers copolymerizable with a), c) 0.1-3.0%-wt. of a cross-linking agent and d) 0-10%-wt. of a water-soluble polymer, in which polymerization is conducted with a redox catalyst system containing formamidine sulfinic acid as reducing agent. The polymer is distinguished by a retention of greater than or equal to 28 g 0.9% aqueous NaCl-solution per 1 g of polymer, an absorption of greater than or equal to 26 g 0.9% aqueous NaCl-solution per 1 g of polymer at a load of 20 g/cm.sup.2 and a residual monomer content of less than 700 ppm, and preferably less than 500 ppm. The invention also relates to the use of this polymer in the production of hygiene articles.