Evonik Stockhausen Gmbh

Evonik Degussa Gmbh

Polymer Latex Gmbh & Co., Kg

Evonik Operations Gmbh

Herbert Vorholt

Manfred Van Stiphoudt

Armin Reimann

Jörg Harren

Davide Brizzolara

Waldemar Inger

Stephan Ramlow

Detlef Jung

Volker Becker

Heinz-Peter Grupe

Henry Rudolph

Stefan Derstappen

Axel Busch

Michael Lange

Kai Hebben

Rüdiger Hose

Martin Beerhorst

The invention relates generally to a process for the preparation of water-absorbent polymer particles, comprising the process steps including of drying the polymer gel particles wherein in process step (viii) the gel particles obtained in process step (vii) are charged onto the surface of the belt material of a belt dryer at a position Land are subsequently dried on their way through the belt dryer and wherein the belt material has been cooled before coming into contact with the gel particles. The invention also relates to water-absorbent polymer particles obtainable by such a process.

Process for the continuous preparation of water-absorbent polymers

The present invention relates to a process for the production of a superabsorber, comprising as steps providing a water-absorbing polymer structure, bringing the water-absorbing polymer structure into contact with a modifying agent, preferably a modifying agent, and the further treatment of the water-absorbing polymer structure which has been brought into contact with the modifying agent. The further treatment is carried out at least partly in a rotating container. The invention furthermore relates to a device for the production of a superabsorber, superabsorbers, a composite, a process for the production of a composite, the composites obtainable by this process, chemical products, such as foams, shaped articles or fibers, and the use of a superabsorber.

Process for gentle mixing and coating of superabsorbers

A process for producing an absorbent polymer including a first mixing event, in which a plurality of absorbent polymer particles () are mixed with a liquid () and a second mixing event, in which the liquid () is homogenized within the interior of the polymer particles. The polymer particles () in the first mixing event are mixed with a speed such that the kinetic energy of the individual polymer particles () is on average larger than the adhesion energy of the individual polymer particles (), and the polymer particles () in the second mixing event are stirred at a lower speed than in the first mixing event. The different speeds effect a fluidization of the polymer particles (), which prevents a clumping of the polymer particles () during the mixing event. The absorbent polymers thus produced are distinguished by a particularly rapid swelling behavior.

Absorbent polymer made by two-step mixing process

Two-step mixing process for producing an absorbent polymer

Process for the preparation of protective colloid-stabilized, emulsifier-free, aqueous dispersions based on at least two monomers selected from vinylaromatics, 1,3-dienes and/or (meth)acrylates, in the presence of assistants and, if required, further comonomers in an amount of from 0.1% by weight to 20% by weight, based on the total amount of monomers, wherein at least 10% by weight of the total amount of water are added to the reaction vessel only after the monomers have been added to the reaction vessel and the conversion is at least 40%, based on 100% of the monomers.

Process for the preparation of protective colloid-stabilized, emulsifier-free, aqueous dispersions

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Haltern am See, Germany

Herbert Vorholt