Patents by Inventor Uwe Stueven

Uwe Stueven has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10208149
    Abstract: 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 ?m.
    Type: Grant
    Filed: October 21, 2016
    Date of Patent: February 19, 2019
    Assignee: BASF SE
    Inventors: Uwe Stueven, Matthias Weismantel, Wilfried Heide, Marco Krüger, Volker Seidl, Stefan Blei, Dennis Loesch, Rüdiger Funk, Annemarie Hillebrecht
  • Patent number: 9751110
    Abstract: A process for continuously classifying water-absorbing polymer beads by means of at least one screen, at least one screen having at least one guide device on the screen surface.
    Type: Grant
    Filed: September 24, 2007
    Date of Patent: September 5, 2017
    Assignee: BASF AKTIENGESELLSCHAFT
    Inventors: Uwe Stueven, Rüdiger Funk, Matthias Weismantel, Meinhard Nitschke, Filip Mees, Leo Van Miert
  • Publication number: 20170037172
    Abstract: 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 ?m.
    Type: Application
    Filed: October 21, 2016
    Publication date: February 9, 2017
    Inventors: Uwe Stueven, Matthias Weismantel, Wilfried Heide, Marco Krüger, Volker Seidl, Stefan Blei, Dennis Loesch, Rüdiger Funk, Annemarie Hillebrecht
  • Patent number: 9327270
    Abstract: A process for continuously preparing water-absorbing polymer beads, comprising the drying of a polymer gel on a forced-air belt dryer, the water content of the polymer gel being used to control the forced-air belt dryer during or after the drying.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: May 3, 2016
    Assignee: BASF SE
    Inventors: Uwe Stueven, Rüdiger Funk, Matthias Weismantel, Karl J. Possemiers, Koen Deboel
  • Patent number: 9073040
    Abstract: 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° 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.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: July 7, 2015
    Assignee: BASF SE
    Inventors: Rainer Dobrawa, Thomas Daniel, Uwe Stueven, Marco Krüger, Francisco Javier Lopez Villanueva, Norbert Herfert, Karin Flore, Stefan Blei, Michael A. Mitchell
  • Patent number: 9029485
    Abstract: 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 ?m per bore and the metering rate is from 0.9 to 5 kg/h per bore.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: May 12, 2015
    Assignee: BASF SE
    Inventors: Marco Krüger, Stefan Blei, Wilfried Heide, Matthias Weismantel, Uwe Stueven
  • Patent number: 8865828
    Abstract: 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.
    Type: Grant
    Filed: November 18, 2009
    Date of Patent: October 21, 2014
    Assignee: BASF SE
    Inventors: Thomas Daniel, Uwe Stueven, Marco Krüger, Stefan Blei, Francisco Javier Lopez Villanueva, Norbert Herfert
  • Publication number: 20140302321
    Abstract: 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 ?m.
    Type: Application
    Filed: April 30, 2014
    Publication date: October 9, 2014
    Applicant: BASF SE
    Inventors: Uwe Stueven, Matthias Weismantel, Wilfried Heide, Marco Krüger, Volker Seidl, Stefan Blei, Dennis Lösch, Rüdiger Funk, Annemarie Hillebrecht
  • Patent number: 8844729
    Abstract: A process for classifying water-absorbing polymer beads, wherein the polymer beads are separated into n particle size fractions by means of at least n screens and n is an integer greater than 1.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: September 30, 2014
    Assignee: BASF SE
    Inventors: Uwe Stueven, Rüdiger Funk, Matthias Weismantel, Juergen Schroeder, Dominicus van Esbroeck
  • Patent number: 8789774
    Abstract: A process for producing water-absorbing polymer particles, wherein an aqueous polymer gel is applied by means of a swivel belt to the conveyor belt of a forced-air belt drier, and the swivel belt, proceeding from one end position, is accelerated through a first pivot angle to an angular speed v1, decelerated through a second pivot angle to an angular speed v2 and decelerated through a third pivot angle to the other end position.
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: July 29, 2014
    Assignee: BASF SE
    Inventors: Uwe Stueven, Rüdiger Funk, Matthias Weismantel, Dominicus van Esbroeck, Ronny De Kaey
  • Patent number: 8790003
    Abstract: The invention relates to the use of an apparatus for adding at least one solid or viscous liquid additive, or an additive dispersed in solvent, to a reactor interior of a reactor for preparing crosslinked, finely divided polymers by copolymerizing (a) water-soluble, monoethylenically unsaturated monomers and (b) from 0.001 to 5 mol %, based on the monomers (a), of monomers comprising at least two polymerizable groups, (c) from 0 to 20 mol %, based on the monomers (a), of water-insoluble monoethylenically unsaturated monomers, where the apparatus comprises at least one screw for conveying the at least one additive and the at least one screw ends in an addition orifice substantially flush with the inner wall of the reactor interior.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: July 29, 2014
    Assignee: BASF SE
    Inventors: Annemarie Hillebrecht, Uwe Stueven, Leo Van Miert, Dominicus van Esbroeck, Bernd Brian, Siegfried Chszaniecki
  • Patent number: 8748000
    Abstract: 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 ?m.
    Type: Grant
    Filed: July 12, 2007
    Date of Patent: June 10, 2014
    Assignee: BASF SE
    Inventors: Uwe Stueven, Matthias Weismantel, Wilfried Heide, Marco Krüger, Volker Seidl, Stefan Blei, Dennis Loesch, Rüdiger Funk, Annemarie Hillebrecht
  • Publication number: 20140038817
    Abstract: 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 ?m per bore and the metering rate is from 0.9 to 5 kg/h per bore.
    Type: Application
    Filed: August 29, 2013
    Publication date: February 6, 2014
    Applicant: BASF SE
    Inventors: Marco Krüger, Stefan Blei, Wilfried Heide, Matthias Weismantel, Uwe Stueven
  • Patent number: 8610097
    Abstract: A process for continuously preparing water-absorbing polymer beads by determining at least one particulate delivery material mass flow by means of incident electromagnetic waves.
    Type: Grant
    Filed: September 24, 2007
    Date of Patent: December 17, 2013
    Assignee: BASF SE
    Inventors: Uwe Stueven, Rüdiger Funk, Matthias Weismantel, Filip Mees, Koen Deboel
  • Publication number: 20130281594
    Abstract: 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° 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.
    Type: Application
    Filed: April 25, 2013
    Publication date: October 24, 2013
    Inventors: Rainer Dobrawa, Thomas Daniel, Uwe Stueven, Marco Krüger, Francisco Javier Lopez Villanueva, Norbert Herfert, Michael A. Mitchell
  • Publication number: 20130276325
    Abstract: A process for continuously preparing water-absorbing polymer beads, comprising the drying of a polymer gel on a forced-air belt dryer, the water content of the polymer gel being used to control the forced-air belt dryer during or after the drying.
    Type: Application
    Filed: June 24, 2013
    Publication date: October 24, 2013
    Inventors: Uwe Stueven, Rüdiger Funk, Matthias Weismantel, Karl J. Possemiers, Koen Deboel
  • Patent number: 8546498
    Abstract: 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 ?m per bore and the metering rate is from 0.9 to 5 kg/h per bore.
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: October 1, 2013
    Assignee: BASF SE
    Inventors: Marco Krüger, Stefan Blei, Wilfried Heide, Matthias Weismantel, Uwe Stueven
  • Patent number: 8536278
    Abstract: A process for producing water-absorbing polymer particles, wherein the water-absorbing polymer particles are surface postcrosslinked with unsaturated fatty acids or derivatives thereof.
    Type: Grant
    Filed: July 10, 2009
    Date of Patent: September 17, 2013
    Assignee: BASF SE
    Inventors: Rüdiger Funk, Wilfried Heide, Uwe Stueven
  • Patent number: 8481159
    Abstract: 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° 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.
    Type: Grant
    Filed: August 25, 2010
    Date of Patent: July 9, 2013
    Assignee: BASF SE
    Inventors: Rainer Dobrawa, Thomas Daniel, Uwe Stueven, Marco Krüger, Francisco Javier Lopez Villanueva, Norbert Herfert, Karin Flore, Stefan Blei, Michael A. Mitchell
  • Patent number: 8450428
    Abstract: 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, which comprises thermal postcrosslinking in the presence of steam.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: May 28, 2013
    Assignee: BASF SE
    Inventors: Thomas Daniel, Marco Krüger, Karin Flore, Stefan Blei, Uwe Stueven, Norbert Herfert, Michael A. Mitchell