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).

  • Transition metal compound, ligand system, catalyst system and process for preparing polyolefins
    Patent number: 7868108
    Abstract: The present invention relates to transition metal compounds of the formula (I), a process for preparing polyolefins by polymerization or copolymerization of at least one olefin in the presence of at least one olefin in the presence of at least one of the catalyst systems according to the invention and the use of the ligand systems according to the invention for preparing transition metal compounds.
    Type: Grant
    Filed: November 27, 2006
    Date of Patent: January 11, 2011
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Benno Bildstein, Alexander Solchinger, Lars Kölling
  • MULTISTAGE PROCESS FOR THE POLYMERIZATION OF OLEFINS
    Publication number: 20110003948
    Abstract: A multistage process for the homo or copolymerization of ethylene carried out in the presence of a catalyst system comprising at least one polymerization catalyst (A) based on a late transition metal component having a tridentate ligand which bears at least two ortho.ortho-disubstituted aryl radicals, at least one Ziegler polymerization catalyst (B), and at least a Lewis acid activating compound (C), wherein the molar ratio of the metal of the activating compound (C) to the late transition metal of catalyst (A) is different in the two polymerizations steps. Catalysts (A) and (B) may be selectively controlled by varying the amount of activating compound (C).
    Type: Application
    Filed: December 23, 2008
    Publication date: January 6, 2011
    Applicant: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Eleonora Ciaccia
  • Catalysts based on 2-aryl-8-anilinoquinoline ligands
    Patent number: 7858718
    Abstract: Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a Group 4 metal complex that incorporates a dianionic, tridentate 2-aryl-8-anilinoquinoline ligand. In one aspect, supported catalysts are prepared by first combining a boron compound having Lewis acidity with excess alumoxane to produce an activator mixture, followed by combining the activator mixture with a support and the tridentate, dianionic Group 4 metal complex. The catalysts are easy to synthesize, support, and activate, and they enable facile production of high-molecular-weight polyolefins.
    Type: Grant
    Filed: July 22, 2009
    Date of Patent: December 28, 2010
    Assignee: Equistar Chemicals, LP
    Inventors: Sandor Nagy, Linda N. Winslow, Shahram Mihan, Reynald Chevalier, Lenka Lukesova, Ilya E. Nifant'ev, Pavel V. Ivchenko, Michael W. Lynch
  • Polyethylene and catalyst composition for its preparation
    Publication number: 20100311925
    Abstract: Polyethylene which comprises ethylene homopolymers and copolymers of ethylene with ?-olefins and has a molar mass distribution width Mw/Mn of from 6 to 100, a density of from 0.89 to 0.97 g/cm3, a weight average molar mass Mw of from 5000 g/mol to 700 000 g/mol and has from 0.01 to 20 branches/1000 carbon atoms and at least 0.5 vinyl groups/1000 carbon atoms, wherein the 5-50% by weight of the polyethylene having the lowest molar masses have a degree of branching of less than 10 branches/1000 carbon atoms and the 5-50% by weight of the polyethylene having the highest molar masses have a degree of branching of more than 2 branches/1000 carbon atoms, a process for its preparation, catalysts suitable for its preparation and also fibers, moldings, films or polymer blends in which this polyethylene is present.
    Type: Application
    Filed: May 27, 2010
    Publication date: December 9, 2010
    Applicant: Basell Polyolefine GmbH
    Inventor: Shahram Mihan
  • ETHYLENE TERPOLYMERS
    Publication number: 20100298501
    Abstract: A copolymer of ethylene, a catalyst system suitable to prepare the copolymer, and a process to prepare such copolymer are described. The copolymer comprises from 60 to 80% by weight of ethylene and from 20 to 40% by weight of at least one first ?-olefin comonomer having n carbon atoms and at least one second ?-olefin comonomer having (n?1) carbon atoms, n being from 4 to 13, has a polydispersity Mw/Mn equal to or lower than 3.5, and a density from 0.855 to 0.880 g/cm3. The copolymer is obtained by subjecting ethylene and said at least one first ?-olefin comonomer to a polymerization stage in the presence of a catalyst system capable of forming a copolymer of ethylene and said at least one first ?-olefin comonomer having n carbon atoms, while forming the second ?-olefin comonomer having (n?1) carbon atoms.
    Type: Application
    Filed: November 27, 2008
    Publication date: November 25, 2010
    Applicant: Basell Polyolefine GmbH
    Inventors: Fabiana Fantinel, Shahram Mihan, Isabella Camurati
  • Antistatic for olefin polymerization and process for preparing it
    Patent number: 7838607
    Abstract: Process for preparing an antistatic for olefin polymerization by contacting an antistatically acting compound comprising at least one hydrogen atom bound to a nonmetallic heteroatom with at least one metal alkyl in an amount which is sufficient to react completely with the at least one hydrogen atom bound to a heteroatom, wherein the antistatically acting compound and the metal alkyl are each present in a concentration of at least 0.01% by weight during contacting.
    Type: Grant
    Filed: May 4, 2007
    Date of Patent: November 23, 2010
    Assignee: Basell Polyolefine GmbH
    Inventor: Shahram Mihan
  • Method of polymerization of olefins
    Patent number: 7834112
    Abstract: A process for the polymerization of olefins using a metal complex of group 3, 4, 5, 6, 7, 8, 9 or 10 of the Periodic Table comprising at least one group C?NR1, C?PR1, C?O, C?S or a heteroaromatic ring system containing at least one atom from the group consisting of N, P, O and S, can be used for controlling the width of the molar mass distribution of the resulting polymers.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: November 16, 2010
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Birgit Dorer, Markus Enders, Pablo Fernandez
  • PROCESS FOR OBTAINING POLYMERS OF ETHYLENE AND CYCLOOLEFINS
    Publication number: 20100267901
    Abstract: A terpolymer containing: a) from 90% to 50% by weight; preferably from 90% to 70% by weight of ethylene derived units; b) from 5% to 40% by weight; preferably from 5% to 20% by weight of derived units of alpha olefin of formula CH2?CHA wherein A is a C1-C20 alkyl radical; c) from 2% to 30% by weight, preferably from 5% to 20% by weight of cycloolefins derived units. Said terpolymer being characterized by the following features i) distribution of molecular weight Mw/Mn lower than 3.5; preferably lower than 3; more preferably lower than 2.7 ii) solubility in xylene at 25° C.
    Type: Application
    Filed: November 26, 2008
    Publication date: October 21, 2010
    Applicant: Basell Polyolefine GmbH
    Inventors: Fabiana Fantinel, Shahram Mihan
  • CATALYST SYSTEM FOR OLEFIN POLYMERIZATION COMPRISING PHENANTHROLINE-COMPRISING IRON COMPLEXES
    Publication number: 20100267910
    Abstract: Catalyst system for olefin polymerization comprising (a) at least one phenanthroline-comprising iron complex, (b) an organic or inorganic support, (c) optionally one or more activators, (d) optionally one or more metal compounds of group 1, 2 or 13 of the Periodic Table and (e) optionally further catalysts suitable for olefin polymerization, and also their use in the polymerization of olefins.
    Type: Application
    Filed: December 16, 2008
    Publication date: October 21, 2010
    Applicant: Basell Polyolefine GmbH
    Inventors: Lars Kölling, Shahram Mihan
  • PHENANTHROLINE-COMPRISING COMPLEXES
    Publication number: 20100234548
    Abstract: Phenanthroline-comprising complexes and catalyst systems obtained therefrom, and also their use in the polymerization of olefins.
    Type: Application
    Filed: December 16, 2008
    Publication date: September 16, 2010
    Applicant: Basell Polyolefine GmbH
    Inventors: Lars Kölling, Shahram Mihan
  • Cyclopentadienyl complexes of group 6 substituted by silyl halides
    Patent number: 7795167
    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: Grant
    Filed: August 16, 2005
    Date of Patent: September 14, 2010
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Markus Enders, Pablo Fernandez
  • Monocyclopentadienyl complexes
    Patent number: 7776980
    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: Grant
    Filed: March 18, 2006
    Date of Patent: August 17, 2010
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Benno Bildstein, Georg Steiner
  • Polyethylene and catalyst composition for its preparation
    Patent number: 7767613
    Abstract: Polyethylene which comprises ethylene homopolymers and copolymers of ethylene with ?-olefins and has a molar mass distribution width Mw/Mn of from 6 to 100, a density of from 0.89 to 0.97 g/cm3, a weight average molar mass Mw of from 5000 g/mol to 700,000 g/mol and has from 0.01 to 20 branches/1000 carbon atoms and at least 0.5 vinyl groups/1000 carbon atoms, wherein the 5-50% by weight of the polyethylene having the lowest molar masses have a degree of branching of less than 10 branches/1000 carbon atoms and the 5-50% by weight of the polyethylene having the highest molar masses have a degree of branching of more than 2 branches/1000 carbon atoms, a process for its preparation, catalysts suitable for its preparation and also fibers, moldings, films or polymer blends in which this polyethylene is present.
    Type: Grant
    Filed: April 25, 2005
    Date of Patent: August 3, 2010
    Assignee: Basell Polyolefine GmbH
    Inventor: Shahram Mihan
  • NMR method of determining and regulating the composition of polymer mixtures in polymerization
    Patent number: 7737230
    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: Grant
    Filed: June 9, 2005
    Date of Patent: June 15, 2010
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Dieter Lilge, Wolfgang Rohde
  • Method of Controlling the Relative Activity of the Different Active Centers of Hybrid Catalysts
    Publication number: 20100130708
    Abstract: Method of preparing olefin polymers, which comprises the polymerization of at least one ?-olefin in the presence of a hybrid catalyst to produce a polymer comprising at least a higher molecular weight polymer component and a lower molecular weight polymer component in the presence of water in an amount of from 2 to 100 mol ppm and/or carbon dioxide in an amount of from 2 to 100 mol ppm, in each case based on the total reaction mixture, in order to alter the ratio of the higher molecular weight polymer component to the lower molecular weight polymer component. This enables the ratio of the higher molecular weight component to the lower molecular weight component to be controlled selectively.
    Type: Application
    Filed: July 13, 2006
    Publication date: May 27, 2010
    Applicant: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Rainer Karer, Harald Chmitz, Dieter Lilge
  • Hybrid catalyst systems supported on magnesium halide
    Patent number: 7723448
    Abstract: The present invention relates to a catalyst system comprising at least two different transition metal coordination compounds supported on an adduct containing magnesium halide and an organoaluminum compound and it relates to a polymerisation process in the presence of said catalyst system.
    Type: Grant
    Filed: October 10, 2006
    Date of Patent: May 25, 2010
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Fabiana Fantinel
  • Catalyst comprising chromium and zirconium for the polymerization and/or copolymerization of olefins
    Patent number: 7714091
    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: Grant
    Filed: June 9, 2005
    Date of Patent: May 11, 2010
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Andreas Haufe, Peter Kölle, Joachim Wulff-Döring, Ingo Treffkorn, Guido Funk
  • Process for preparing a chromium-based catalyst for the polymerization and/or copolymerization of olefins
    Patent number: 7705097
    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: Grant
    Filed: June 9, 2005
    Date of Patent: April 27, 2010
    Assignee: Basell Polyolefine GmbH
    Inventors: Shahram Mihan, Andreas Haufe, Peter Kölle, Joachim Wulff-Döring, Ingo Treffkorn, Guido Funk
  • Hybrid catalyst composition for polymerization of olefins
    Publication number: 20100099825
    Abstract: The present invention relates to a new hybrid catalyst system for the polymerization of olefins and to a polymerization process carried out in the presence of said catalyst. The new hybrid catalyst system comprises a tridendate iron compound and a zirconocene having a bridge of at least three carbon atoms connecting two indenyl ligands.
    Type: Application
    Filed: September 18, 2009
    Publication date: April 22, 2010
    Inventors: Harald Schmitz, Shahram Mihan
  • POLYETHYLENE AND CATALYST COMPOSITION AND PROCESS FOR THE PREPARATION THEREOF
    Publication number: 20100093956
    Abstract: The invention relates to a bimodal or multimodal polyethylene which comprises ethylene homopolymers and/or copolymers of ethylene with ?-olefins, has a polydispersity index Mw/Mn of the low molecular weight component of less than 10 and can be prepared using a polymerization catalyst based on a Ziegler component and a late transition metal component having a tridentate ligand which bears at least two ortho,ortho-disubstituted aryl radicals and also a catalyst system and a process for preparing the polyethylene and also fibers, moldings, films and polymer blends comprising this material.
    Type: Application
    Filed: March 31, 2008
    Publication date: April 15, 2010
    Applicant: BASELL POLYOLEFINE GMBH
    Inventors: Shahram Mihan, Harald Schmitz