Cassella Aktiengesellschaft

Basf Aktiengesellschaft

Helmut Klotzsche

Ulrich Riegel

Uwe Stuven

Gustav Remmel

Norbert Herfert

Fritz Engelhardt

Rudolf Schliwa

Uwe St&uuml;ven

Joachim Dentler

Hydrogel particles are produced by a drying step followed sequentially by precomminuting, grinding, separating, and further drying of coarse particles.

Complete drying method for hydrogels

The present invention relates to pulverulent water-swellable hydrophilic (co)polymers which comprise, for reducing dusting, auxiliaries from the series consisting of silicones and/or other auxiliaries, the latter in a total amount of less than 1% by weight, for example polyglycols or polyglycol ethers, the vapor pressure of the individual auxiliaries being not more than 0.1 mbar at 20.degree. C. and their melting point being not more than 100.degree. C., processes for their preparation and their use for absorption of water and aqueous solutions.

Low-dusting pulverulent hydrophilic polymers

The present invention relates to a hydrophilic highly swellable hydrogel based on (co)polymerized hydrophilic monomers or based on graft (co)polymers, characterized in that it is post-crosslinked with a polyamidoamine in an aqueous medium.

Hydrophilic highly swellable hydrogels

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Alzenau, Germany

Helmut Klotzsche