Evonik Degussa Gmbh

Evonik Operations Gmbh

Markus Henn

Laurent Wattebled

Franck Furno

Harald Schmidt

Jorg Harren

Christoph Loick

Jörg Harren

Rainer Teni

Anne Ix-Mund

Peter Herbe

Anna Miasnikova

The present invention relates to a process for producing a water-absorbing polymer, comprising the process steps of (i) mixing (&#x3b1;1) 0.1 to 99.999% by weight of polymerizable, ethylenically unsaturated monomers containing acid groups, or salts thereof, (&#x3b1;2) 0 to 70% by weight of polymerized, ethylenically unsaturated monomers copolymerizable with (&#x3b1;1), (&#x3b1;3) 0.001 to 10% by weight of one or more crosslinkers, where the sum of the weights (&#x3b1;1) to (&#x3b1;3) is 100% by weight, (ii) free-radical polymerization with crosslinking to form a water-insoluble, aqueous untreated hydrogel polymer, (iii) drying the hydrogel polymer, (iv) grinding and sieving the water-absorbing polymer to size, wherein the aqueous monomer solution, is admixed with 0.01 to 5% by weight of at least one surfactant and optionally 0.01 to 5% by weight of a blowing agent having a particle size of 10 &#x3bc;m to 900 &#x3bc;m, based on the water-absorbing polymer.

Superabsorbent polymers with rapid absorption properties and process for producing same

The present invention relates to a particulate absorbent polymer material having:

Super-absorbing polymers with rapid absorption properties and method for producing the same

The present invention relates to a water-absorbing composition comprising water-absorbing polymer structures, on the surface of which is at least one tannin fraction which has a number-average molecular weight, determined in accordance with the test method described herein, of at least 1,000 g/mol, which has a weight-average molecular weight, determined in accordance with the test method described herein, of at least 1,000 g/mol, or which is a hydrolysable gallotannin. The present invention also relates to a process for the preparation of a water-absorbing composition, the water-absorbing composition obtainable by this process, a composite, a process for the production of a composite, the composite obtainable by this process, chemical products, such as, for example, hygiene articles, the use of a water-absorbing composition or of a composite and the use of a tannin fraction.

Superabsorbent composition with tannins for odor control

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Gelsenkirchen, Germany

Markus Henn