Evonik Degussa Gmbh

Evonik Stockhausen Gmbh

Evonik Operations Gmbh

Evonik Superabsorber Gmbh

Armin Reimann

Harald Schmidt

Mirko Walden

Herbert Vorholt

Manfred Van Stiphoudt

Rainer Teni

Volker Becker

Detlef Jung

Michael Keup

Franck Furno

Peter Herbe

Ursula Nielinger

Heinz-Peter Grupe

Jörg Issberner

Henry Rudolph

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 preparation of water-absorbing polymer structures, comprising the following process steps: The invention relates also to the water-absorbing polymer structures obtainable by that process, to water-absorbing polymer structures, to a composite comprising a water-absorbing polymer structure and a substrate, to a process for the preparation of a composite, to the composite obtainable by that process, to chemical products, such as foams, molded articles and fibers comprising water-absorbing polymer structures or a composite, to the use of water-absorbing polymer structures or of a composite in chemical products and to the use of a salt in the treatment of the surface of water-absorbing polymer structures.

Water-absorbing polymer structure having improved permeability and absorption under pressure

The present invention relates to a superabsorber composition comprising The invention furthermore relates to a process for the preparation of a superabsorber composition, the superabsorber composition obtainable by this process, a composite comprising the superabsorber composition according to the invention, a process for the production of a composite, the composite obtainable by this process, the use of the superabsorber composition according to the invention in chemical products and chemical products comprising the superabsorber composition according to the invention or the composite according to the invention.

Preparation of highly permeable, superabsorbent polymer structures

The present invention relates to a process for the preparation of water-absorbing polymer structures, comprising the following process steps: I) providing an untreated, water-absorbing polymer structure; and II) bringing the untreated, water-absorbing polymer structure into contact with a salt comprising a divalent or higher-valent cation of a metal and at least one organic base as anion. The invention relates also to the water-absorbing polymer structures obtainable by that process, to water-absorbing polymer structures, to a composite comprising a water-absorbing polymer structure and a substrate, to a process for the preparation of a composite, to the composite obtainable by that process, to chemical products, such as foams, molded articles and fibers comprising water-absorbing polymer structures or a composite, to the use of water-absorbing polymer structures or of a composite in chemical products and to the use of a salt in the treatment of the surface of water-absorbing polymer structures.

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

Absorbent polymer granulate comprising the following process steps: i) polymerization of an aqueous monomer solution to obtain a polymer gel; ii) comminution of the polymer gel to obtain a gel granulate; and iii) drying of the gel granulate, and is characterized in that the gel granulate after step ii) has a spread behavior. The production process of an absorbent polymer distinguishes itself by a particularly efficient drying step iii), which enables a particularly gentle and uniform drying of the gel granulate. The obtained absorbent polymers and products and items produced therefrom have a particularly uniform product quality and constant physical-chemical properties.

Absorbent polymer granulate

The process according to the invention for production of an absorbent polymer comprising the following process steps: i) polymerization of an aqueous monomer solution to obtain a polymer gel; ii) comminution of the polymer gel to obtain a gel granulate; and iii) drying of the gel granulate, and is characterized in that the gel granulate after step ii) has a spread behavior. The production process of an absorbent polymer distinguishes itself by a particularly efficient drying step iii), which enables a particularly gentle and uniform drying of the gel granulate. The obtained absorbent polymers and products and items produced therefrom have a particularly uniform product quality and constant physical-chemical properties.

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Willich, Germany

Armin Reimann