Patents by Inventor Holger Lutjens

Holger Lutjens 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).

  • Process for preparing monodisperse ion exchangers having chelating functional
    Patent number: 7077964
    Abstract: The present invention relates to a process for preparing novel, monodisperse ion exchangers having chelating functional groups, and their use for adsorbing metal compounds, in particular, heavy metal compounds and noble metal compounds, and also for extracting alkaline-earth metals from saline solutions from alkali metal chloride electrolysis.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: July 18, 2006
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Klipper, Werner Strüver, Ulrich Schnegg, Bruno Hees, Bernhard Lehmann, Holger Lütjens
  • Process for preparing monodisperse anion exchangers
    Patent number: 7053129
    Abstract: The present invention relates to a process for preparing novel, monodisperse anion exchangers by (a) reacting monomer droplets made from monovinylaromatic compounds and polyvinylaromatic compounds, and optional porogens and/or initiators, (b) amidomethylating the resultant monodisperse, crosslinked bead polymers with phthalimide derivatives, (c) converting the amidomethylated bead polymers to aminomethylated bead polymers, and (d) alkylating the aminomethylated bead polymers.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: May 30, 2006
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Klipper, Werner Strüver, Ulrich Schnegg, Rüdiger Seidel, Alfred Mitschker, Holger Lütjens
  • Process for preparing monodisperse ion exchangers having chelating functional
    Publication number: 20040082744
    Abstract: The present invention relates to a process for preparing novel, monodisperse ion exchangers having chelating functional groups, and their use for adsorbing metal compounds, in particular, heavy metal compounds and noble metal compounds, and also for extracting alkaline-earth metals from saline solutions from alkali metal chloride electrolysis.
    Type: Application
    Filed: October 17, 2003
    Publication date: April 29, 2004
    Inventors: Reinhold Klipper, Werner Struver, Ulrich Schnegg, Bruno Hees, Bernhard Lehmann, Holger Lutjens
  • Process for the preparation of strongly basic anion exchangers using ethylene oxide
    Patent number: 6716889
    Abstract: Reacting weakly basic anion exchangers bearing tertiary amino groups with ethylene oxide under pH control and addition of acid leads to superior strongly basic anion exchangers.
    Type: Grant
    Filed: April 2, 1998
    Date of Patent: April 6, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Holger Lütjens, Axel Ingendoh, Karl-Rudolf Gassen, Peter Wenzl, Klaus Rall
  • Process for preparing monodisperse anion exchangers having strongly basic functional groups
    Patent number: 6699913
    Abstract: The present invention relates to a process for preparing novel, monodisperse anion exchangers having strongly basic functional groups either in the center of the resin particle or in the shell of the resin particle, as well as to their use.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: March 2, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Klipper, Ulrich Schnegg, Rüdiger Seidel, Hans-Karl Soest, Alfred Mitschker, Holger Lütjens
  • Method for producing osmotically and mechanically stable gel-like anion exchangers
    Patent number: 6667349
    Abstract: The present invention relates to a process for preparing gel-like anion exchangers by aminating crosslinked gel-like styrene divinybenzene bead polymers that contain halogenoalkyl groups in the presence of an inorganic salt and in the absence of organic solvents.
    Type: Grant
    Filed: October 11, 2000
    Date of Patent: December 23, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Holger Lütjens, Reinhold Klipper, Georg Martin, Alfred Mitschker, Michael Holzbrecher
  • Process for preparing monodisperse ion exchangers having chelating functional groups and the use thereof
    Patent number: 6649663
    Abstract: The present invention relates to a process for preparing novel, monodisperse ion exchangers having chelating functional groups, and their use for adsorbing metal compounds, in particular, heavy metal compounds and noble metal compounds, and also for extracting alkaline-earth metals from saline solutions from alkali metal chloride electrolysis.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: November 18, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Klipper, Werner Strüver, Ulrich Schnegg, Bruno Hees, Bernhard Lehmann, Holger Lütjens
  • Process for the preparation of low-bleeding cation exchangers
    Patent number: 6646017
    Abstract: Strongly acid cation exchangers with improved properties are obtained if the sulphonation of the non-functionalized polymers is carried out at a high temperature and/or in the absence of oxygen.
    Type: Grant
    Filed: October 21, 1997
    Date of Patent: November 11, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Maria Klipper, Rudolf Wagner, Olaf Halle, Klaus Rall, Holger Lütjens
  • Process for preparing selective ion exchangers
    Patent number: 6610753
    Abstract: The present invention relates to a process for preparing selective ion exchangers based on crosslinked vinylaromatic polymers and containing iminoacetic acid units of the general formulas (I) and (II) wherein X represents hydrogen or an alkali metal ion, by reacting a weak-base anion exchanger bearing primary amino groups with monochloro-acetic acid and/or an alkali metal salt of monochloroacetic acid at a temperature of from 70 to 110° C. and a pH of from 7 to 11.
    Type: Grant
    Filed: August 10, 1999
    Date of Patent: August 26, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Holger Lütjens, Klaus Rall, Axel Ingendoh, Reinhold Klipper
  • PROCESS FOR PREPARING SELECTIVE ION EXCHANGERS
    Publication number: 20020193454
    Abstract: The present invention relates to a process for preparing selective ion exchangers based on crosslinked vinylaromatic polymers and containing iminoacetic acid units of the general formulas (I) and (II) 1
    Type: Application
    Filed: August 10, 1999
    Publication date: December 19, 2002
    Inventors: HOLGER LUTJENS, KLAUS RALL, AXEL INGENDOH, REINHOLD KLIPPER
  • Process for preparing heterodisperse chelating resins
    Publication number: 20020185443
    Abstract: The object of the present invention is a process for preparing novel heterodisperse chelating resins having chelating functional groups, and their use for adsorbing metal compounds, in particular alkaline earth metals, heavy metal compounds and precious metal compounds, and also for extracting alkaline earth metals from saline solutions derived from alkali metal chloride electrolysis, and also in hydrometallurgy.
    Type: Application
    Filed: April 29, 2002
    Publication date: December 12, 2002
    Inventors: Reinhold Klipper, Rudiger Seidel, Bruno Hees, Dieter Irmscher, Bernhard Lehmann, Holger Lutjens, Ulrich Schnegg, Wolfgang Zarges
  • Process for preparing monodisperse, crosslinked bead polymers having thiourea groups and their use for adsorbing metal compounds
    Publication number: 20020035216
    Abstract: The present invention relates to a process for preparing novel, monodisperse crosslinked bead polymers having thiourea groups and their use for adsorbing metal compounds, in particular heavy metal compounds or noble metal compounds.
    Type: Application
    Filed: October 15, 2001
    Publication date: March 21, 2002
    Inventors: Reinhold Klipper, Werner Struver, Ulrich Schnegg, Heiko Hoffmann, Dieter Mauer, Bernhard Lehmann, Bruno Hees, Holger Lutjens
  • Sulfonation process
    Publication number: 20020022671
    Abstract: The present invention relates to a process for preparing strongly acidic macroporous or strongly acidic monodisperse-gel-type ion exchangers, particularly macroporous monodisperse, macroporous heterodisperse, or monodisperse-gel-type cation exchangers, by treating the respective basis polymer with sulfuric acid in stepwise cycles at graded concentrations. The invention further relates to the cation exchangers prepared by this process and to their uses.
    Type: Application
    Filed: July 5, 2001
    Publication date: February 21, 2002
    Inventors: Reinhold Klipper, Rudolf Wagner, Rudiger Seidel, Holger Lutjens, Axel Ingendoh, Ulrich Schnegg
  • Process for preparing monodisperse, crosslinked bead polymers having thiourea groups and their use for adsorbing metal compounds
    Patent number: 6329435
    Abstract: The present invention relates to a process for preparing novel, monodisperse crosslinked bead polymers having thiourea groups and their use for adsorbing metal compounds, in particular heavy metal compounds or noble metal compounds.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: December 11, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Klipper, Werner Strüver, Ulrich Schnegg, Heiko Hoffmann, Dieter Mauer, Bernhard Lehmann, Bruno Hees, Holger Lütjens
  • Process for the preparation of crosslinked spherical polymers
    Patent number: 6221287
    Abstract: This invention relates to suspension polymers having high swellability have low contents of soluble fractions prepared using aliphatic peroxyesters as polymerization initiators.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: April 24, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Podszun, Olaf Halle, Werner Strüver, Robert Bloodworth, Holger Lütjens
  • Crosslinked bead-form polymers
    Patent number: 6060558
    Abstract: Suspension polymers having high swellability have low contents of soluble fractions if aliphatic peroxy esters are used as polymerization initiators.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: May 9, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Podszun, Olaf Halle, Werner Struver, Robert Bloodworth, Holger Lutjens
  • Process for preparing crosslinked bead-form polymers
    Patent number: 5932152
    Abstract: Suspension polymers having high swellability have low contents of soluble fractions if aliphatic peroxy esters are used as polymerization initiators.
    Type: Grant
    Filed: April 6, 1998
    Date of Patent: August 3, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Podszun, Olaf Halle, Werner Struver, Robert Bloodworth, Holger Lutjens
  • Process for the preparation of crosslinked polymers
    Patent number: 5834524
    Abstract: Monodisperse crosslinked polymers prepared by seed/feed polymerization have less tendency to tack when a microencapsulated monodisperse crosslinked polymer has been used as seed. Compared with the seed used, the seed/feed polymer obtained exhibits substantially less broadening of the particle size distribution when microencapsulated seed has been used.
    Type: Grant
    Filed: August 22, 1997
    Date of Patent: November 10, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Robert Bloodworth, Werner Struver, Holger Lutjens, Olaf Halle, Wolfgang Podszun
  • Process for preparing weakly-basic anion exchangers and reagents suitable for this purpose
    Patent number: 5464875
    Abstract: An improved aminomethylation process gives weakly-basic anion exchangers in an elegant way, with by-product obtained being able to be processed into a suitable starting material without problems.
    Type: Grant
    Filed: August 12, 1994
    Date of Patent: November 7, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Klipper, Stefan Antons, Guido Steffan, Alfred Mitschker, Werner Struver, Holger Lutjens
  • Mixtures of bisphenols and graft polymers
    Patent number: 5434203
    Abstract: Powdery mixture of from 1 to 99 weight % of a graft polymer of resin-forming monomers on a rubber and from 99 to 1 weight % of a bisphenol and the use thereof for improving chemical materials.
    Type: Grant
    Filed: August 19, 1994
    Date of Patent: July 18, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christian Lindner, Holger Lutjens, Karl-Erwin Piejko