Patents by Inventor Shahram Mihan

Shahram Mihan 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).

  • Loop reactor with varying diameter for olefin polymerization
    Patent number: 7517938
    Abstract: Process for polymerizing at least one olefinic monomer selected from ethylene, propylene and 1-butene in a loop reactor in the presence of a polymerization catalyst at from 20 to 150° C., but below the melting point of a polymer to be formed, and a pressure of from 43 to 80 bar, where the polymer formed is present in a suspension in a liquid or supercritical suspension medium and wherein the suspension is circulated by means of an axial pump, wherein the polymerization is carried out at an average solids concentration in the reactor of more than 53% by weight, in the case of continuous product discharge, and at an average solids concentration in the reactor of more than 45% by weight, in the case of discontinuous product discharge, and wherein the polymerization is carried out at an ethylene concentration of at least 10 mol %, based on the suspension medium.
    Type: Grant
    Filed: September 16, 2004
    Date of Patent: April 14, 2009
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Wolfgang Gsella, Peter Kölle, Joachim Wulff-Döring, Markus Meierhöfer
  • Monocyclopentadienyl complexes
    Patent number: 7507688
    Abstract: Monocyclopentadienyl complexes in which the cyclopentadienyl system bears at least one unsubstituted, substituted or fused, 5-membered heteroaromatic ring system bound via a specific bridge, a catalyst system comprising at least one of the monocyclopentadienyl complexes, the use of the catalyst system for the polymerization or copolymerization of olefins and a process for preparing polyolefins by polymerization or copolymerization of olefins in the presence of the catalyst system and polymers obtainable in this way.
    Type: Grant
    Filed: December 5, 2003
    Date of Patent: March 24, 2009
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Ilya Nifant'ev, Cristina Nicoara, Markus Enders
  • Transition-metal complexes with tridentate, nitrogen-containing ligands
    Patent number: 7507782
    Abstract: Transition metal complexes with tridentate, nitrogen-containing, uncharged ligand systems, a catalyst system comprising at least one of the transition metal complexes, the use of the catalyst system for the polymerization or copolymerization of olefins and a process for preparing polyolefins by polymerization or copolymerization of olefins in the presence of the catalyst system.
    Type: Grant
    Filed: May 19, 2004
    Date of Patent: March 24, 2009
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Markus Enders, Olaf Fritz
  • Method of Changing Between Incompatible Polymerization Catalysts in a Gas-Phase Fluidized-Bed Reactor
    Publication number: 20090062486
    Abstract: Method of changing from a polymerization using a first catalyst to a polymerization using a second catalyst which is incompatible with the first catalyst in a gas-phase reactor, which comprises the steps a) stopping of the polymerization reaction using the first catalyst, b) flushing of the reactor under polymerization conditions with at least one deactivating agent comprising a volatile constituent and a nonvolatile constituent in a weight ratio of from 0.1 to 1000, c) introduction of the second catalyst into the reactor and d) continuation of the polymerization using the second catalyst.
    Type: Application
    Filed: November 10, 2006
    Publication date: March 5, 2009
    Applicant: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Rainer Karer
  • Process for the Preparation of Unsymmetric Bis(Imino) Compounds
    Publication number: 20090054609
    Abstract: Process for the preparation of monoimine compounds, wherein a dicarbonyl compound is reacted in an aliphatic, non-aromatic solvent with aniline. Monoimine compounds having electron-withdrawing substituents in the ortho position and unsymmetric bis(imino) compounds and unsymmetric iron complexes prepared therefrom and the use thereof in the polymerization of olefins.
    Type: Application
    Filed: January 8, 2007
    Publication date: February 26, 2009
    Applicant: BASELL POLYOLEFINE GMBH
    Inventors: Shahram Mihan, Benno Bildstein, Lars Kolling, Alexander Solchinger, Sascha Schlawjinski
  • Plastics pipes of polyolefins
    Patent number: 7485685
    Abstract: Plastics pipes comprise polyolefins which can be prepared by means of a fluorine-modified chromium catalyst and are used for transporting gases and liquids.
    Type: Grant
    Filed: October 19, 2006
    Date of Patent: February 3, 2009
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Heinz Vogt, Ilka Beuermann
  • Monocyclopentadienyl Complexes
    Publication number: 20090018292
    Abstract: Monocyclopentadienyl complexes in which the cyclopentadienyl system bears at least one bridged keto, thioketo, imino or phosphino group, a catalyst system comprising at least one of the monocyclopentadienyl complexes and a process for preparing polyolefins by polymerization or copolymerization of olefins in the presence of the catalyst system.
    Type: Application
    Filed: March 18, 2006
    Publication date: January 15, 2009
    Applicant: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Benno Bildstein, Georg Steiner
  • Supported Metal Alkyl Compound And Its Preparation
    Publication number: 20080306224
    Abstract: Pulverulent solid which consists essentially of at least one metal alkyl compound bound chemically and/or physically to a finely divided, porous, mechanically stable and chemically inert support, has a proportion by weight of metal alkyl compound of at least 5% by weight, based on the support, and has an angle of repose, determined in accordance with ISO 4324, of up to 48°. The solid allows trouble-free metering as active component into a reactor.
    Type: Application
    Filed: October 9, 2004
    Publication date: December 11, 2008
    Applicant: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Rosendorfer Philipp, Rainer Karer, Martin Schneider, Peter Eck
  • Polyethylene and Catalyst Composition for Its Preparation
    Publication number: 20080286509
    Abstract: A polyethylene which comprises ethylene homopolymers and/or copolymers of ethylene with 1-alkenes and has a molar mass distribution width Mw/Mn of from 5 to 30, a density of from 0.92 to 0.955 g/cm3, a weight average molar mass Mw of from 50000 g/mol to 500 000 g/mol and has from 0.01 to 20 branches/1000 carbon atoms and a z-average molar mass Mz of less than 1 Mio.
    Type: Application
    Filed: April 25, 2005
    Publication date: November 20, 2008
    Applicant: Basell Polyolefine GmbH
    Inventors: Jennifer Kipke, Shahram Mihan, Rainer Karer, Dieter Lilge
  • Catalyst Comprising Chromium and Zirconium for the Polymerization and/or Copolymerization of Olefins
    Publication number: 20080269437
    Abstract: Catalyst for the polymerization and/or copolymerization of olefins which is obtainable by application to a finely divided inorganic support and concluding calcination at temperatures of from 350 to 1050° C. and has a chromium content of from 0.1 to 5% by weight and a zirconium content of from 0.5 to 10% by weight, in each case based on the element in the finished catalyst, with the molar ratio of zirconium to chromium being from 0.6 to 5.
    Type: Application
    Filed: June 9, 2005
    Publication date: October 30, 2008
    Applicant: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Andreas Haufe, Peter Kolle, Joachim Wulff-Doring, Ingo Treffkorn, Guido Funk
  • Monocyclopentadienyl Complexes
    Publication number: 20080269445
    Abstract: Monocyclopentadienyl complexes in which the cyclopentadienyl system bears at least one bridged donor and at least one arylalkyl group and a catalyst system comprising at least one of the monocyclopentadienyl complexes, and also methods for preparing them, the use of the catalyst system for the polymerization or copolymerization of olefins and a process for preparing polyolefins by polymerization or copolymerization of olefins in the presence of the catalyst system and the preparation of the associated cyclopentadienyl system.
    Type: Application
    Filed: December 15, 2005
    Publication date: October 30, 2008
    Applicant: Basell Polyolefine GmbH
    Inventor: Shahram Mihan
  • Nmr Method of Determining and Regulating the Composition of Polymer Mixtures in Polymerization
    Publication number: 20080200622
    Abstract: Method of determining the composition of polymer mixtures comprising defined polymer components of differing mean molar masses Mn, which comprises the steps (a) recording of at least one 1H-NMR relaxation curve of the polymer mixture and (b) calculating the proportions of the polymer components by matching the measured relaxation curve with the relaxation curves of the individual polymer components. In this way, the composition of polymer mixtures can be determined quickly and simply. Furthermore, process integration for regulating the polymerization is possible.
    Type: Application
    Filed: June 9, 2005
    Publication date: August 21, 2008
    Applicant: BASELL POLYOLEFINE GmbH
    Inventors: Shahram Mihan, Dieter Lilge, Wolfgang Rohde
  • Loop Reactor With Varying Diameter For Olefin Polymerization
    Publication number: 20080119624
    Abstract: Process for polymerizing at least one olefinic monomer selected from ethylene, propylene and 1-butene in a loop reactor in the presence of a polymerization catalyst at from 20 to 150° C., but below the melting point of a polymer to be formed, and a pressure of from 43 to 80 bar, where the polymer formed is present in a suspension in a liquid or supercritical suspension medium and wherein the suspension is circulated by means of an axial pump, wherein the polymerization is carried out at an average solids concentration in the reactor of more than 53% by weight, in the case of continuous product discharge, and at an average solids concentration in the reactor of more than 45% by weight, in the case of discontinuous product discharge, and wherein the polymerization is carried out at an ethylene concentration of at least 10 mol %, based on the suspension medium.
    Type: Application
    Filed: September 16, 2004
    Publication date: May 22, 2008
    Applicant: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Wolfgang Gsella, Peter Kolle, Joachim Wulff-Doring, Markus Meierhofer
  • Preparation of supports for catalysts
    Publication number: 20080096761
    Abstract: The invention relates to a process for preparing a support for catalysts, which comprises: a) preparing a hydrogel; b) milling the hydrogel to give a finely particulate hydrogel; c) producing a slurry based on the finely particulate hydrogel; d) drying the slurry comprising the finely particulate hydrogel to give the support for catalysts, wherein a finely particulate hydrogel in which at least 5% by volume of the particles, based on the total volume of the particles, have a particle size in the range from >0 ?m to ?3 ?m; and/or at least 40% by volume of the particles, based on the total volume of the particles, have a particle size in the range from >0 ?m to ?12 ?m, and/or at least 75% by volume of the particles, based on the total volume of the particles, have a particle size in the range from >0 ?m to ?35 ?m, is produced in step b).
    Type: Application
    Filed: February 2, 2005
    Publication date: April 24, 2008
    Applicant: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Michael Hesse
  • Cyclopentadienyl Complexes Of Group 6 Substituted By Silyl Halides
    Publication number: 20080097053
    Abstract: Cyclopentadienyl complexes of group 6 having at least one cyclopentadienyl system which is substituted by at least one silyl group which bears at least one halogen substituent and a catalyst system comprising at least one of the cyclopentadienyl complexes, and also a process for preparing them, the use of the catalyst system for the polymerization or copolymerization of olefins and a process for preparing polyolefins by polymerization or copolymerization of olefins in the presence of the catalyst system.
    Type: Application
    Filed: August 16, 2005
    Publication date: April 24, 2008
    Inventors: Shahram Mihan, Markus Enders, Pablo Fernandez
  • Monocyclopentadienyl complexes
    Publication number: 20080064838
    Abstract: Monocyclopentadienyl complexes in which the cyclopentadienyl system bears at least one unsubstituted, substituted or fused, heteroaromatic ring system bound via a specific bridge, a catalyst system comprising at least one of the monocyclopentadienyl complexes, the use of the catalyst system for the polymerization or copolymerization of olefins and a process for preparing polyolefins by polymerization or copolymerization of olefins in the presence of the catalyst system and polymers obtainable in this way.
    Type: Application
    Filed: October 31, 2007
    Publication date: March 13, 2008
    Applicant: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Ilya Nifant'ev
  • Process for Preparing a Chromium-Based Catalyst for the Polymerization and/or Copolymerization of Olefins
    Publication number: 20080051532
    Abstract: Process for preparing a supported catalyst for the polymerization and/or copolymerization of olefins which has a chromium content of from 0.01 to 5% by weight, based on the element, which comprises (a) preparing a homogeneous solution comprising an organic or inorganic chromium compound and at least one further organic or inorganic compound of elements selected from among Mg, Ca, Sr, B, Al, Si, P, Bi, Sc, V, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Ru, Rh, Pd, Hf, Ta, W in a protic or aprotic polar solvent, (b) bringing the solution from a) into contact with a finely divided inorganic support to form a catalyst precursor, (c) if appropriate, removing the solvent from the catalyst precursor and (d) calcining the catalyst precursor at temperatures of from 350 to 950° C., preferably 400 to 900° C., under oxidative conditions.
    Type: Application
    Filed: June 9, 2005
    Publication date: February 28, 2008
    Applicant: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Andreas Haupe, Peter Kolle, Joachim Wulff-Doring, Ingo Treffkorn, Guido Funk
  • Polyethylene for Injection Moldings
    Publication number: 20070255033
    Abstract: Polyethylene which comprises ethylene homopolymers and/or copolymers of ethylene with 1-alkenes and has a molar mass distribution width Mw/Mn of from 3 to 30, a density of from 0.945 to 0.965 g/cm3, a weight average molar mass Mw of from 50 000 g/mol to 200 000 g/mol, a HLMI of from 10 to 300 g/10 min and has from 0.
    Type: Application
    Filed: April 25, 2005
    Publication date: November 1, 2007
    Applicant: BASELL POYOLEFINE GMBH
    Inventors: Jennifer Kipke, Shahram Mihan, Rainer Karer, Dieter Lilge
  • Method for alpha-olefin trimerization
    Patent number: 7279609
    Abstract: The invention concerns a method for ?-olefin trimerization comprising a number of carbon atoms not less than 3, by transforming an ?-olefin or a hydrocarbon mixture containing ?-olefins, at temperatures ranging between 0 and 150° C. and pressures ranging between 1 and 200 bars, in the presence of a catalyst. Said method uses a catalyst capable of being produced from: a) a compound of formula RMX3, wherein: R represents a cyclopentadienyl group whereof the hydrogen atoms can be partly or entirely substituted by identical or different alkyl groups and/or aryl groups, two substituents being capable of further forming a saturated or unsaturated hydrocarbon chain; M represents a titanium, zirconium or hafnium atom; and the groups X represent independently of one another extractable counter-ions; and b) at least an activating adjuvant.
    Type: Grant
    Filed: September 16, 2002
    Date of Patent: October 9, 2007
    Assignee: BASF Aktiengesellschaft
    Inventor: Shahram Mihan
  • Polymerization catalyst used for producing polyolefins that have excellent combined properties
    Patent number: RE40140
    Abstract: The invention relates to a process for preparing a catalyst for the polymerization of olefins, which comprises: a) preparation of a finely divided silica xerogel, b) loading of the xerogel with chromium from a solution of chromium trioxide or a chromium compound which is converted into chromium trioxide under the conditions of step c), and c) activation of the resulting product at from 400 to 1100° C. in a water-free gas stream comprising oxygen in a concentration of above 10% by volume, wherein a fluoride doping with a fluorinating agent is carried out in step b) or in step c). Furthermore, the invention relates to a catalyst for the polymerization of olefins which is obtainable by the process of the invention and to a process for the polymerization of olefins in which an olefin or an olefin mixture is polymerized in the presence of a catalyst according to the invention.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: March 4, 2008
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Martin Lux, Wolfgang Rohde, Andreas Deckers, Peter Kölle, Heinz Vogt