Patents by Inventor Michael Dauben

Michael Dauben 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).

  • Catalyst system for gas phase polymerization of conjugated dienes
    Patent number: 6576727
    Abstract: The present invention relates to a catalyst system for gas phase polymerization of conjugated dienes, consisting of a rare earth compound, an aluminum organic compound, a further Lewis acid, optionally a conjugated diene, an inert inorganic or organic support and a co-catalyst applied to an inorganic support, in order to improve the flowability of rubber thus produced.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: June 10, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Dauben, Jürgen Schneider, Gerd Sylvester, Nobert Steinhauser
  • Gas-phase polymerization in a bell-shaped reactor
    Patent number: 6441108
    Abstract: The present invention relates to a process for the continuous discharge of pre-classified polymer particles, particularly rubber particles, from a gas phase polymerization reactor, comprising the steps of classifying the polymer in a classifier, discharging the particles with a sufficient size and conveying the undersized particles back into the gas phase polymerization reactor.
    Type: Grant
    Filed: April 6, 2000
    Date of Patent: August 27, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Friedrich Haendeler, Heiko Herold, Leslaw Mleczko, Claus Riehle, Franz-Josef Mersmann, Jürgen Schneider, Michael Dauben
  • Method for avoiding instabilities during gas phase polymerization of rubber
    Patent number: 6399720
    Abstract: The present invention relates to a process for the avoidance of instability during the gas polymerization of rubber comprising the feeding of low volatility monomers supported in a particulate material into a fluidized bed reactor.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: June 4, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Dauben, Wolfgang Nentwig, Jürgen M. Schneider
  • Polymerization-initiating supported systems
    Patent number: 6387837
    Abstract: This invention relates to a process for the free-radical polymerization of monomers in gas phase or suspension processes using a supported, polymerization-initiating system comprising a) one or more polymerization-initiating components which initiate and start free-radical polymerization, b) a support, onto which said polymerization-initiating component is applied, and c) optionally, one or more modifiers which have an influence upon reaction kinetics and/or product properties.
    Type: Grant
    Filed: February 3, 1999
    Date of Patent: May 14, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Dauben, Martin Hoch, Christiane Oppenheimer-Stix, Peter Schertl
  • Catalyst system, the use thereof in the polymerization of dienes in a solution, suspension and vapor phase and the use of diene rubbers produced therewith
    Patent number: 6291615
    Abstract: The present invention is directed to a catalyst system, the use thereof in the polymerization of dienes in a solution, suspension and vapor phase, and the use of diene rubbers produced therewith, exhibiting a high cis content, an average vinyl content and a low gel content.
    Type: Grant
    Filed: August 10, 1999
    Date of Patent: September 18, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Dauben, Rüdiger Engehausen, Heinz Hermann Greve, Wolfgang Nentwig, Walter Kaminsky, Christian Strübel, Volker Scholz