Patents Assigned to Basell Polyoefine GmbH
  • Process for the preparation of ethylene homopolymers or copolymers in a high-pressure reactor controlled by a model based predictive controller
    Patent number: 8710160
    Abstract: Process for the preparation of ethylene homopolymers or copolymers in the presence of free-radical polymerization initiator at from 100° C. to 350° C. and pressures in the range of from 160 MPa to 350 MPa in a high-pressure polymerization unit comprising a high-pressure reactor with one or more reaction zones, to each of which free-radical polymerization initiator is fed, which is controlled by a model based predictive controller carrying out the steps.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: April 29, 2014
    Assignee: Basell Polyoefine GmbH
    Inventors: Christian-Ulrich Schmidt, Klaus Berhalter, Steve Makin, Kevin Taylor
  • Metallocenes containing ligands of 2-substituted indenyl derivatives, process for their preparation, and their use as catalysts
    Patent number: RE39561
    Abstract: The novel metallocenes of the formula I in which, preferably, M1 is Zr or Hf, R1 and R2 are alkyl or halogen, R3 and R4 are hydrogen, R5 and R6 are alkyl or haloalkyl, —(CR8R9)m—R7—(CR8R9)n— is a single- or multi-membered chain in which R7 may also be a (substituted) hetero atom, m+n is zero or 1, and R10 is hydrogen, form, together with aluminoxanes as cocatalysts, a very effective catalyst system for the preparation of polyolefins of high stereospecificity and high melting point.
    Type: Grant
    Filed: July 17, 1997
    Date of Patent: April 10, 2007
    Assignee: Basell Polyoefine GmbH
    Inventors: Andreas Winter, Martin Antberg, Walter Spaleck, Jürgen Rohrmann, Volker Dolle