Basf Se Corporation

Styrolution Europe Gmbh

Marco Krüger

Matthias Weismantel

Stefan Blei

Uwe Stueven

Wilfried Heide

Rüdiger Funk

Dennis Lösch

Annemarie Hillebrecht

Dennis Loesch

Volker Seidl

Thomas Daniel

Norbert Herfert

Andreas Daiss

Ulrich Schröder

John Joseph Louden

Michael A Mitchell

Robert Bayer

Francisco Javier Lopez Villanueva

Jürgen Freiberg

Rudolf Schliwa

Karin Flore

Rainer Dobrawa

Karl Possemiers

Antje Ziemer

Sylvia Bertha

Achim Stammer

Stephan Bauer

Katrin Baumann

Christophe Bauduin

Markus Toennessen

Asif Karim

Carolin Nadine Dücker

Markus Muehl

Oliver Gampfer

Michael Heeger

Volker Spindler

Dieter Ehnes

Dieter Reimer

An apparatus for production of pulverulent polymers having a reactor for droplet polymerization with an apparatus for dropletization of a monomer solution for the preparation of the polymer. The apparatus for dropletization has holes through which the monomer solution is introduced, an addition point for a gas above the apparatus for dropletization, at least one gas withdrawal point at the periphery of the reactor and a fluidized bed, wherein at least one of the following is fulfilled:

Device and method for producing powdered polymers

A process for preparing water-absorbing polymer beads by polymerizing droplets comprising at least one monomer in a gas phase surrounding the droplets, the droplets being obtained by enveloping a first monomer solution with a second monomer solution and polymerizing the second monomer solution and polymerizing to give a more highly crosslinked polymer than the first monomer solution.

Method for the production of absorbent polymer particles by polymerizing drops of a monomer solution

An apparatus for producing pulverulent poly(meth)acrylate in a reactor for droplet polymerization having an apparatus for dropletization of a monomer solution for the production of the poly(meth)acrylate having holes through which the monomer solution is introduced, an addition point for a gas above the apparatus for dropletization, at least one gas withdrawal point on the circumference of the reactor and a fluidized bed, and above the gas withdrawal point the reactor has a region having a constant hydraulic internal diameter and below the gas withdrawal point the reactor has a hydraulic internal diameter that steadily decreases. The reactor has a heating means in the region having a steadily decreasing hydraulic internal diameter.

Apparatus for producing pulverulent poly(meth)acrylate

A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution, comprising monomers bearing acid groups, in a gas phase surrounding the droplets, wherein the monomer solution comprises polyvalent cations and the polymer beads have a mean diameter of at least 150 &#x3bc;m.

Method for producing water-absorbent polymer particles with a higher permeability by polymerising droplets of a monomer solution

An apparatus for addition of droplets of a monomer solution for production of poly(meth)acrylate to a reactor for droplet polymerization, comprising at least one channel or a dropletizer head having, at its base, holes through which the solution is dropletized into the reactor, at least one of the following features being fulfilled:

Apparatus for addition of droplets of a monomer solution to a reactor

An apparatus for introducing droplets of a monomer solution for production of poly(meth)acrylate into a reactor for droplet polymerization, comprising at least one channel or a dropletizer head, the channel or the dropletizer head being sealed at its base by a dropletizer plate, the dropletizer plate having holes through which the monomer solution is introduced into the reactor, and the dropletizer plate being configured such that holes that, in an axially symmetric dropletizer plate or in an annular dropletizer plate or in one configured as a ring segment, are not on a center line of the dropletizer plate or, in the case of a circular dropletizer plate, are not at the center of the dropletizer plate are aligned such that monomer solution is introduced through the holes into the reactor at an angle to the vertical, and the holes in the case of a radial alignment of axially symmetric dropletizer plates being aligned such that the angle at which the monomer solution is introduced into the reactor decreases in the direction of the axis of the reactor and, in the case of dropletizer plates arranged parallel to one another or of concentrically arranged dropletizer plates, each being aligned on a line parallel to the center line or line running concentrically about the center, such that the angle at which the monomer solution is introduced into the reactor is constant.

Apparatus for introduction of droplets of a monomer solution into a reactor

The present invention relates to a process for producing fluid-absorbent cores, comprising mixing a fibrous material and fluid-absorbent polymer particles having low moisture content and low apparent density and pressing the obtained mixture under specific conditions.

Fluid-absorbent articles

The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, wherein the temperature of the gas leaving the polymerization chamber is 130&#xb0; C. or less, the gas velocity inside the polymerization chamber is at least 0.5 m/s, and the droplets are generated by using a droplet plate having a multitude of bores.

Water-absorbent polymer particles

A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a surrounding gas phase in a reaction chamber, wherein the monomer solution is metered into the reaction chamber via at least one bore, and the diameter is from 210 to 290 &#x3bc;m per bore and the metering rate is from 0.9 to 5 kg/h per bore.

Method for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution

The present invention relates to fluid-absorbent articles, comprising an upper liquid-pervious layer, a lower liquid-impervious layer and a fluid-absorbent core, wherein the fluid-absorbent core comprises a fibrous material and 10 to 95% by weight of spherical fluid-absorbent polymer particles having a moisture content of at least 8% by weight.

Fluid absorbent articles

A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a surrounding gas phase, wherein the polymer particles are coated with a permeability improver.

Method for producing permeable water-absorbing polymer particles through polymerization of drops of a monomer solution

A process for producing polymer particles by polymerizing liquid droplets in a gas phase surrounding the droplets, said droplets comprising at least one monomer and being coated with particulate solids during the polymerization.

Method for producing polymer particles by the polymerization of liquid droplets in a gas phase

A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets, wherein a water-insoluble inorganic salt is suspended in the monomer solution and the polymer beads have a mean diameter of at least 150 &#x3bc;m.

Method for producing water-absorbent polymer particles with a higher permeability by polymerizing droplets of a monomer solution

A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a surrounding gas phase, the resulting polymer particles having a water content of at least 5% by weight, and being aftertreated thermally in the fluidized state in the presence of steam at a temperature of at least 60&#xb0; C.

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Mannheim, Germany

Marco Krüger