Patents by Inventor Jürgen Nahstoll

Jürgen Nahstoll 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).

  • Method for reducing residual monomers in liquid systems by adding an oxidation-reduction initiator system
    Patent number: 6462138
    Abstract: A process is described for reducing the residual monomer content in a liquid solution, mixture, melt, suspension or dispersion of a polymer by postpolymerization with addition of a redox initiator system at a reaction temperature appropriate to it and with an extremely short mixing time of the liquid system in the production reactor by metering—gradually, in portions or continuously—at least one of the redox initiator components required to initiate polymerization of the residual monomers over a period (metering time) which is from about 10 to 250 times the mixing time of the liquid system in said reactor.
    Type: Grant
    Filed: March 15, 2000
    Date of Patent: October 8, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Robert Rupaner, Sven Lawrenz, Johannes Dobbelaar, Gerhard Bauer, Franz-Josef Mueseler, Werner Kirchner, Bradley Ronald Morrison, Jürgen Nahstoll, Martin Meister, Reinhard Bächer, Wolfgang Hübinger, Gerhard Schumacher
  • Use of a single-stage or multistage stirrer to prepare polymers
    Patent number: 6252018
    Abstract: At least one single-stage or multistage stirrer which produces not only a tangential flow component but also an axial flow field is used in a stirred-vessel reactor in connection with the preparation of polymers by liquid phase polymerization.
    Type: Grant
    Filed: March 16, 1998
    Date of Patent: June 26, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Robert Rupaner, Sven Lawrenz, Gerhard Bauer, Johannes Dobbelaar, Jürgen Nahstoll, Franz-Josef Mueseler, Axel Ferber, Jürgen Hartmann, Peter Keller, Martin Meister, Josef Neutzner, Gerd Rehmer