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:
Oct. 08, 2013
Filed:
Nov. 18, 1999
Thomas Daniel, Waldsee, DE;
Ulrich Riegel, Frankfurt, DE;
Matthias Weismantel, Jossgrund, DE;
Norbert Herfert, Altenstadt, DE;
Friedrich Engelhardt, Frankfurt, DE;
Thomas Daniel, Waldsee, DE;
Ulrich Riegel, Frankfurt, DE;
Matthias Weismantel, Jossgrund, DE;
Norbert Herfert, Altenstadt, DE;
Friedrich Engelhardt, Frankfurt, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The invention relates to hydrogels capable of absorbing aqueous fluids, which hydrogels are produced by polymerization of olefinically unsaturated carboxylic acids or their derivatives. The hydrogels are characterized in that before, during or after the polymerization reaction and before drying a silicic acid alkali salt of the general formula (I) MO×nSiOis added to the polymerization reaction mixture. In said formula M is an alkali metal and n is a number between 0.5 and 4. The hydrogel obtained in this way is then dried at an elevated temperature. The invention also relates to a method for producing said hydrogels and to their use for absorbing aqueous fluids.