Cassella Aktiengesellschaft

Hoechst Aktiengesellschaft

Basf Corporation

Clariant Corporation

Uwe Stuven

Ulrich Riegel

Fritz Engelhardt

Norbert Herfert

Gustav Remmel

Thomas Daniel

Helmut Klotzsche

Friedrich Engelhardt

Manfred Mayer

Detlev Seip

Ulrich Kussmaul

Adolf Schmidt

The present invention relates to the use of surfactants for improving the drying properties of hydrophilic, highly swellable hydrogels in the course of drying with the aid of contact dryers.

Use of surfactants in the drying of hydrophilic highly swellable

The present invention relates to hydrophilic, highly swellable hydrogels which are coated with nonreactive, water-insoluble waxes in a quantity of from about 0.05 to about 2% by weight, based on uncoated hydrogel.

Hydrophilic, highly swellable hydrogels

The present invention relates to hydrophilic, highly swellable hydrogels which are coated with non-reactive, water-insoluble film-forming polymers.

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

The present invention relates to hydrophilic, swellable graft polymers which comprise, in a random distribution, from 0.5 to 50% by weight of radicals of the general formula I ##STR1## and radicals of the general formula II ##STR2## from 49 to 99% by weight of radicals of the general formula III ##STR3## containing an acid group, and from 0.1 to 2% by weight of radicals of a crosslinking agent which are derived from monomers containing at least two olefinically unsaturated double bonds, where the radicals R.sup.1 to R.sup.4, X and Y and n and m are where X and Y, independently of one another are COCH.sub.3, CH.sub.2 COOR.sup.2, COCH.sub.2 CH.sub.2 COOH ##STR4## n and m, independently of one another, are 2 to 300, R.sup.1 is hydrogen or methyl, R.sup.2, independently of one another, are hydrogen, methyl or ethyl, R.sup.3 is the carboxyl group, the sulphonyl group, the phosphonyl group, which is optionally esterified by means of alkanol having 1 to 4 carbon atoms, or a group of the formula ##STR5## to the preparation thereof, and to the use thereof as absorbents for water and aqueous solutions.

Hydrophilic, swellable graft polymers

The pair of substances for absorption heat transformers consists of methanol and tetraethylene glycol dimethyl ether.

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Bad Soden, Germany

Uwe Stuven