Patents Represented by Attorney John Tyrell

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  • Ethylene polymerization process
    Patent number: 6995220
    Abstract: A process for polymerizing ethylene is disclosed. The ethylene is polymerized with a catalyst system which comprises an activator and an indeno[2,1-b]indolyl Group 4-6 transition metal complex having open architecture. The process gives polyethylene having a broad molecular weight distribution for improved processability.
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: February 7, 2006
    Assignee: Equistar Chemicals, LP
    Inventors: Shaotian Wang, Gregory G. Hlatky
  • Olefin polymerization in the presence of a dehydrogenation catalyst
    Patent number: 6982305
    Abstract: A process for polymerizing olefins is disclosed. The process polymerizes an olefin in the presence of a dehydrogenation catalyst and an olefin polymerization catalyst. The dehydrogenation catalyst enables in-situ generation of alkenes from oligomers or solvent. The alkenes are then incorporated into the polyolefin. The polyolefin should have increased long-chain branching and lower density without the use of expensive comonomers.
    Type: Grant
    Filed: January 26, 2004
    Date of Patent: January 3, 2006
    Assignee: Equistar Chemicals, LP
    Inventor: Sandor Nagy
  • Process for making polyolefin compositions containing exfoliated clay
    Patent number: 6979718
    Abstract: A clay-filled polyolefin composition and process for making it are disclosed. The process involves treatment of a non-acid-treated smectite clay with a Ziegler-Natta catalyst in the presence of a hydrocarbon and subsequent polymerization of an olefin in the presence of the treated clay and an organoaluminum cocatalyst. Results indicate that filled compositions produced by this process contain exfoliated clay.
    Type: Grant
    Filed: July 28, 2003
    Date of Patent: December 27, 2005
    Assignee: Equistar Chemicals, LP
    Inventors: Douglas D. Klendworth, Mark K. Reinking
  • Olefin polymerization process
    Patent number: 6967231
    Abstract: A process for polymerizing ethylene is disclosed. A magnesium chloride-alcohol is used to support an organometallic complex comprising a Group 3 to 10 transition metal and an indenoindolyl ligand. The supported organometallic complex is mixed with an activator and ethylene and the ethylene is polymerized. Use of magnesium chloride containing an alcohol as the support provides an unexpected boost in catalyst activity and improves polymer rheological properties.
    Type: Grant
    Filed: September 23, 2004
    Date of Patent: November 22, 2005
    Assignee: Equistar Chemicals, LP
    Inventors: Shaotian Wang, Douglas D. Klendworth, Mark K. Reinking
  • Olefin polymerization process
    Patent number: 6958377
    Abstract: A process for polymerizing olefins is disclosed. The process uses an organometallic complex with at least one non-bridged indenoindolyl ligand bonded to M. The substituent on the indole nitrogen contains an atom selected from the group consisting of S, O, P, and N. Polyolefins from the process have unexpectedly high molecular weight compared with polyolefins made using similar supported indenoindolyl complexes.
    Type: Grant
    Filed: October 15, 2003
    Date of Patent: October 25, 2005
    Assignee: Equistar Chemicals, LP
    Inventors: Sandor Nagy, Barbara M. Tsuie
  • Hydrosilane additives for increased polyolefin molecular weight
    Patent number: 6939930
    Abstract: A process for polymerizing olefins is disclosed. The process uses a hydrosilane in a polymerization catalyzed by an open architecture, bridged indenoindolyl organometallic complex and an activator. Polyolefins from the process have increased molecular weight.
    Type: Grant
    Filed: September 9, 2003
    Date of Patent: September 6, 2005
    Assignee: Equistar Chemicals, LP
    Inventors: Mark K. Reinking, Gregory G. Hlatky
  • Process for copolymerizing ethylene with vinylsilanes
    Patent number: 6936671
    Abstract: A process for copolymerizing ethylene with vinylsilanes is disclosed. The process uses a Ziegler-Natta catalyst and cocatalyst wherein the Ziegler-Natta catalyst is prepared from a Group 4-6 halogen-containing transition metal and a mixture of an organomagnesium compound and a silicon-containing compound. Silane-functionalized polyolefins produced using the process can be crosslinkable and can be used to bond polyolefins to polysiloxanes or other functionalized polymers.
    Type: Grant
    Filed: October 8, 2003
    Date of Patent: August 30, 2005
    Assignee: Equistar Chemicals, LP
    Inventors: Sameer D. Mehta, Mark K. Reinking
  • Olefin polymerization process
    Patent number: 6933353
    Abstract: A method for preparing a supported organometallic complex is disclosed. An organometallic complex is combined with a support material that has been treated with an organozinc compound. The organometallic complex comprises a Group 3 to 10 transition metal and an indenoindolyl ligand that is bonded to the transition metal. Also disclosed is a process for polymerizing an olefin using the supported complex. Organozinc treatment of the support unexpectedly boosts catalyst activity and polyolefin molecular weight.
    Type: Grant
    Filed: July 7, 2003
    Date of Patent: August 23, 2005
    Assignee: Equistar Chemicals, LP
    Inventor: Shaotian Wang
  • Process for making polyethylene
    Patent number: 6818713
    Abstract: A process for polymerizing ethylene is disclosed. The process uses a catalyst system which has a supported open architecture indenoindolyl complex. We surprisingly found that modifying the open architecture complex to incorporate a C6-C20 hydrocarbyl amido group enables the production of polyethylene having good flow while maintaining high catalyst activity.
    Type: Grant
    Filed: August 11, 2003
    Date of Patent: November 16, 2004
    Assignee: Equistar Chemicals, LP
    Inventors: Shaotian Wang, Gregory G. Hlatky
  • Triple-decker catalysts based on delocalized dianionic ligands
    Patent number: 6812183
    Abstract: Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a triple-decker bimetallic complex. The complex includes two Group 3-10 transition metals and a delocalized dianionic ligand that is pi-bonded to each of the metals. The behavior of the catalysts can be modified by choice of each metal, by the choice of the dianionic ligand, or by choice of the ancillary ligands. The invention provides a new way to make a large variety of catalyst systems.
    Type: Grant
    Filed: April 23, 2003
    Date of Patent: November 2, 2004
    Assignee: Equistar Chemicals, LP
    Inventors: Sandor Nagy, Joel A. Mutchler
  • Olefin polymerization process
    Patent number: 6794468
    Abstract: A process for polymerizing olefins is disclosed. The process combines a bridged indenoindolyl organometallic complex and an activator with a support material in the presence of an aromatic solvent. The supported catalyst containing the aromatic solvent is used to polymerize an olefin in the presence of hydrogen. Polyolefins from the process have improved flow properties.
    Type: Grant
    Filed: May 12, 2003
    Date of Patent: September 21, 2004
    Assignee: Equistar Chemicals, LP
    Inventor: Shaotian Wang
  • Polyolefin block copolymers
    Patent number: 6737487
    Abstract: A block copolymer of an &agr;-olefin and a second olefin is disclosed. The block copolymers are not highly isotactic, but contain isotactic sequences and have a narrow molecular weight distribution. A process for the preparation of these block copolymers and blends of these copolymers are also disclosed.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: May 18, 2004
    Assignee: Equistar Chemicals, LP
    Inventor: Craig C. Meverden
  • Propylene polymerization process
    Patent number: 6693155
    Abstract: A process for polymerizing propylene is disclosed. The propylene is polymerized with a catalyst system which comprises an activator and a [1,2-b]indenoindolyl Group 4-6 transition metal complex having open architecture. The process has high catalyst activity and gives high molecular weight elastomeric polypropylene.
    Type: Grant
    Filed: March 5, 2003
    Date of Patent: February 17, 2004
    Assignee: Equistar Chemicals, LP
    Inventors: Craig C. Meverden, Gregory G. Hlatky, Shaotian Wang
  • High molecular weight polypropylene process
    Patent number: 6683150
    Abstract: A propylene polymerization process is disclosed. The process uses a fluorenyl-indenoindolyl catalyst precursor in the presence of an activator to obtain high molecular weight polypropylene with low degrees of isotacticity and syndiotacticity. In particular, the polypropylene has tacticity such that mmmm is 0-20% and rrrr is 0-60%.
    Type: Grant
    Filed: December 19, 2002
    Date of Patent: January 27, 2004
    Assignee: Equistar Chemicals, LP
    Inventors: Craig C. Meverden, Sandor Nagy, Barbara M. Tsuie
  • Process for making polyolefin compositions containing exfoliated clay
    Patent number: 6646072
    Abstract: A clay-filled polyolefin composition and process for making it are disclosed. The process involves treatment of a non-acid-treated smectite clay with a Ziegler-Natta catalyst in the presence of a hydrocarbon and subsequent polymerization of an olefin in the presence of the treated clay and an organoaluminum cocatalyst. Results indicate that filled compositions produced by this process contain exfoliated clay.
    Type: Grant
    Filed: January 23, 2002
    Date of Patent: November 11, 2003
    Assignee: Equistar Chemicals, LP
    Inventors: Douglas D. Klendworth, Mark K. Reinking
  • Use of silanes to enhance activity in single-site polymerizations
    Patent number: 6642326
    Abstract: A process for the polymerization of olefins is disclosed. A boraaryl catalyst precursor and an activator are used in the presence of a silane modifier. A low level of silane modifier enhances the activity of the catalyst.
    Type: Grant
    Filed: May 3, 2002
    Date of Patent: November 4, 2003
    Assignee: Equistar Chemicals, LP
    Inventors: Karen E. Meyer, Mark K. Reinking
  • Propylene polymerization process with enhanced catalyst activity
    Patent number: 6630544
    Abstract: A process for polymerizing propylene is disclosed. The process involves charging propylene and about 90 to 99% of an organoaluminum cocatalyst to a reactor and heating this mixture to at least about 50° C. This is followed by addition of a premix of 1 to 10% of the organoaluminum cocatalyst with a magnesium halide-supported Ziegler-Natta catalyst. The temperature of the reaction mixture is maintained to produce a propylene polymer. The process gives improved catalyst activity.
    Type: Grant
    Filed: April 18, 2002
    Date of Patent: October 7, 2003
    Assignee: Equistar Chemicals, LP
    Inventors: Douglas D. Klendworth, Mark K. Reinking, Edward D. Kist, Karen E. Meyer
  • Use of silanes to control molecular weight in olefin polymerizations
    Patent number: 6630547
    Abstract: A process for polymerizing an olefin is disclosed. The olefin is polymerized with a catalyst precursor in the presence of an activator and an organosilane modifier. Use of the organosilane increases polyolefin molecular weight. The process is easy to practice and affords polyolefins with conventional polymerization methods such as slurry polymerizations or gas-phase polymerizations.
    Type: Grant
    Filed: June 11, 2002
    Date of Patent: October 7, 2003
    Assignee: Equistar Chemicals, LP
    Inventors: Michael W. Lynch, Shaotian Wang, William J. Sartain
  • Static reduction
    Patent number: 6630548
    Abstract: A gas-phase process for polymerizing an olefin is disclosed. The process involves feeding the catalyst into the reactor in a stream of gas that comprises at least 75 volume % of a noble gas in order to reduce static.
    Type: Grant
    Filed: November 1, 2002
    Date of Patent: October 7, 2003
    Assignee: Equistar Chemicals, LP
    Inventors: Kiran M. Gupte, Kevin Tolley, Joel A. Mutchler, Charles S. Holland
  • Complexes based on four-membered cyclic anionic six-electron-donor ligands
    Patent number: 6586545
    Abstract: A single-site olefin polymerization catalyst and method of making it are disclosed. The catalyst comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10 transition metal, M, and at least one anionic heterocyclobutenyl ligand that is bonded to M. Molecular modeling results indicate that single-site catalysts based on anionic heterocyclobutenyl ligands will have advantages compared with the performance of catalysts based on cyclopentadienyl and substituted cyclopentadienyl ligands.
    Type: Grant
    Filed: December 20, 2001
    Date of Patent: July 1, 2003
    Assignee: Equistar Chemicals, LP
    Inventor: Sandor Nagy