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| Number | Title | Issue Date |
| 8188199 | Method of promoting olefin polymerization The method of promoting olefin polymerization uses a nanoparticle filler to increase the activity of a metallocene catalyst for in situ polymerization of polyolefins. The filler may be nanoparticles of manganese, or nanoparticles of manganese-doped titanium dioxide.... | 05/29/2012 |
| 8163853 | Metallocene-substituted pyridyl amines, their metal complexes, and processes for production and use thereof This invention relates to new transition metal complexes for use in olefin polymerization and oligomerization. The active complex is a pyridine amide having a metallocenyl substituent as part of the ligand structure. The invention also relates to novel precursors fo... | 04/24/2012 |
| 8148482 | Tactic polymer polymerization process using chiral catalysts A process for forming tactic polymers employing at least one olefin polymerization catalyst comprising a non-racemic mixture of the R- and S-enantiomers of a metal complex containing at least one asymmetrically substituted (chiral) carbon atom, and a chain shuttling... | 04/03/2012 |
| 8119747 | Interpolymers suitable for use in hot melt adhesives and processes to prepare the same The present invention relates to an ethylene/α-olefin interpolymer product comprising at least one α-olefin interpolymerized with ethylene and, characterized in at least one aspect, as having improved properties when utilized in a hot melt adhesive formulation. Th... | 02/21/2012 |
| 8088871 | Catalyst systems and polymerization processes A method of polymerizing olefins with catalyst systems, such as, for example, a multimodal catalyst system, wherein the catalyst system is stored at a controlled temperature to minimize loss of catalyst system productivity. ... | 01/03/2012 |
| 8003739 | Multi-component catalyst systems and polymerization processes for forming in-situ heterophasic copolymers and/or varying the xylene solubles content of polyolefins Embodiments of the invention generally include multi-component catalyst systems, polymerization processes and heterophasic copolymers formed by the processes. The multi-component catalyst system generally includes a first catalyst component selected from Ziegler-Nat... | 08/23/2011 |
| 7973112 | De-foaming spray dried catalyst slurries A method for preparing a spray dried catalyst and a low viscosity, low foam spray dried catalyst system for olefin polymerization are provided. In one aspect, the method includes preparing a catalyst system including one or more components selected from metallocenes... | 07/05/2011 |
| 7960487 | Dual metallocene catalysts for polymerization of bimodal polymers This invention relates to catalyst compositions, methods, and polymers encompassing at least one first Group 4 metallocene compound comprising bridging η5-cyclopentadienyl-type ligands, in combination with at least one second Group 4 metallocene with non... | 06/14/2011 |
| 7951882 | Catalyst composition comprising shuttling agent for higher olefin multi-block copolymer formation Copolymers, especially multi-block copolymer containing therein two or more segments or blocks differing in chemical or physical properties, are prepared by polymerizing propylene, 4-methyl-1-pentene, or other C4-8α-olefin and one or more copolymerizable... | 05/31/2011 |
| 7915358 | Copolymer, production process thereof, lubricating oil viscosity modifier, and lubricating oil composition Copolymers when used as lubricating oil viscosity modifiers enable lubricating oils to show excellent low-temperature properties. Processes for producing the copolymers are disclosed. Lubricating oil viscosity modifiers and lubricating oil compositions contain the c... | 03/29/2011 |
| 7767771 | Chain growth reaction process A process is disclosed for the preparation of zinc alkyl chain growth products via a catalysed chain growth reaction of an alpha-olefin on a zinc alkyl, wherein the chain growth catalyst system employs a group 3-10 transition metal, or a group 3 main group metal, or... | 08/03/2010 |
| 7705097 | Process for preparing a chromium-based catalyst for the polymerization and/or copolymerization of olefins 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 orga... | 04/27/2010 |
| 7662894 | Polymer supported metallocene catalyst composition for polymerizing olefins A catalyst composition for polymerizing olefins to polymers having bimodal molecular weight distribution comprises two transition metal-containing metallocene compounds, a magnesium compound, an alcohol, an aluminum containing co-catalyst and a polymeric support. Th... | 02/16/2010 |
| 7582711 | Ziegler-type catalysts having increased productivity The present invention relates to catalyst systems for polyolefin production, and more particularly, to catalyst systems for polyolefins used in producing films. ... | 09/01/2009 |
| 7459509 | Polyethylene resins The invention provides ethylene/α-olefin copolymers exhibiting improved environmental stress cracking resistance properties, and methods for the production of the copolymers in a single reactor by means of a bimetallic catalyst including a Ziegler component and a m... | 12/02/2008 |
| 7449527 | Polyolefin production Provided is a process for producing a polyolefin having a multimodal molecular weight distribution, which process comprises: (a) polymerizing a first olefin monomer in the presence of an isomerizable metallocene catalyst, to form a first multi-modal polyolefin compo... | 11/11/2008 |
| 7442750 | Supported olefin polymerization catalyst Supported catalyst systems are provided comprising (a) a transition metal compound, (b) an activator comprising (iii) an aluminoxane or (iv) a Group lilA metal or metalloid compound, and (c) a support material comprising an inorganic metal oxide, inorganic metal hal... | 10/28/2008 |
| 7429634 | Polymer production at supercritical conditions This invention relates to a process to polymerize olefins comprising contacting, in a polymerization system, olefins having three or more carbon atoms with a catalyst compound, activator, optionally comonomer, and optionally diluent or solvent, at a temperature abov... | 09/30/2008 |
| 7410926 | Polymerization process using a supported, treated catalyst system The present invention relates to a supported, treated catalyst system and its use in a process for polymerizing olefin(s). More particularly, it provides a supported, treated catalyst system produced by a process comprising the steps of: (a) forming a supported bime... | 08/12/2008 |
| 7396888 | Catalyst system comprising a mixture of catalyst components for producing a polyolefin blend Provided is a catalyst system for producing a polyolefin blend, which catalyst system comprises a mixture including the following catalyst components: i) a catalyst component A capable of producing an isotactic olefin polymer, and/or a catalyst component A′ capabl... | 07/08/2008 |
| 7384885 | Catalyst activation and resins therefrom The present invention relates to the removal of hydrocarbon residues from a catalyst and more specifically the air activation of a catalyst containing hydrocarbon residues. It also relates to extruded pipe and utility conduit resins comprising polyethylene, househol... | 06/10/2008 |
| 7361623 | Trimerisation and oligomerisation of olefins using a chromium based catalyst The invention provides a mixed heteroatomic ligand for an oligomerisation of olefins catalyst, which ligand includes at least three heteroatoms, of which at least one heteroatom is nitrogen and at least two heteroatoms are not the same. The invention also provides a... | 04/22/2008 |
| 7354979 | Polymer production at supercritical conditions This invention relates to a process to polymerize olefins comprising contacting, in a polymerization system, olefins having three or more carbon atoms with a catalyst compound, activator, optionally comonomer, and optionally diluent or solvent, at a temperature abov... | 04/08/2008 |
| 7348381 | High modulus, high ductility polyolefins Provided herein are propylene polymers which are capable of being used as thermoplastic polyolefins just as they emerge from the reactor system described, without further compounding of components which substantially modify the physical properties of the polymers, a... | 03/25/2008 |
| 7348384 | Supported, titanized chromium catalyst and its use for preparing homopolymers and copolymers of ethylene Novel supported, titanized chromium catalysts for the homopolymerization of ethylene and the copolymerization of ethylene with α-olefins, a process for preparing them and to their use for the polymerization of olefins. ... | 03/25/2008 |
| 7348383 | Spray-dried, mixed metal ziegler catalyst compositions A Ziegler-Natta catalyst composition comprising a solid mixture formed by halogenation of: Al) a spray-dried catalyst precursor comprising the reaction product of a magnesium compound, a non-metallocene titanium compound, and at least one non-metallocene compound of... | 03/25/2008 |
| 7341977 | Method of sorbing sulfur compounds using nanocrystalline mesoporous metal oxides Compounds and methods for sorbing organosulfur compounds from fluids are provided. Generally, compounds according to the present invention comprise mesoporous, nanocrystalline metal oxides. Preferred metal oxide compounds either exhibit soft Lewis acid properties or... | 03/11/2008 |
| 7326760 | Production of broad molecular weight polyethylene Broad molecular weight polyethylene and polyethylene having a bimodal molecular weight profile can be produced with chromium oxide based catalyst systems employing alkyl silanols. The systems may also contain various organoaluminum compounds. Catalyst activity and m... | 02/05/2008 |
| 7323526 | Supported metallocene-alkyl catalyst composition A supported catalyst composition having improved flow properties is disclosed comprising an alkylalumoxane, a metallocene-alkyl an inorganic oxide support having an average particle size of from 0.1 to 50 μm and calcined at a temperature greater than 600° C., and ... | 01/29/2008 |
| 7323523 | Adjusting polymer characteristics through process control Properties of a polymer produced in gas phase or slurry phase using a dual catalyst such as polydispersity and comonomer incorporation, may be controlled by controlling reaction parameters such as temperature, (co)monomer pressure, hydrogen partial pressure and the ... | 01/29/2008 |
| 7323524 | Tandem tetramerisation-polymerisation of olefins The invention provides a process for polymerising olefins to branched polyolefins in the presence of a polymerisation catalyst and a cocatalyst, wherein the cocatalyst produces 1-octene in a selectivity greater than 30%. ... | 01/29/2008 |
| 7321015 | Adjusting polymer characteristics through process control Properties of a polymer produced using a dual catalyst on the same support, such as polydispersity and comonomer incorporation, may be controlled by controlling reaction parameters such as temperature, monomer pressure, hydrogen partial pressure and the presence of ... | 01/22/2008 |
| 7312283 | Polymerization catalysts and process for producing bimodal polymers in a single reactor Catalyst compositions comprising a first metallocene compound, a second metallocene compound, an activator-support, and an organoaluminum compound are provided. Methods for preparing and using such catalysts to produce polyolefins are also provided. The compositions... | 12/25/2007 |
| 7304159 | Ligands and catalyst systems thereof for ethylene oligomerisation to linear alpha olefins Mixed bis-imine pyridine ligands of formula (I), wherein Z1, which is different from Z2, is an optionally substituted aryl group; and Z2 comprises an optionally substituted heterohydrocarbyl moiety, or an optionally substituted aryl ... | 12/04/2007 |
| 7304118 | Polyethylene pipe having better melt processibility and high resistance to stress and method of preparing the same using metallocene catalyst An ethylene-based copolymer for non-crosslinked water supply pipe is provided. The ethylene-based copolymer is prepared using a supported hybrid metallocene catalyst and has a dimodal or broad molecular weight distribution. The ethylene-based copolymer has a high de... | 12/04/2007 |
| 7300988 | Single catalyst low, medium and high density polyethylenes A method of polymerizing olefins comprising combining in one embodiment ethylene and optionally one or more α-olefins with a catalyst composition in a continuous polymerization reactor at a pressure of less than 10,000 kPa; wherein the catalyst composition comprise... | 11/27/2007 |
| 7294680 | Method of producing conjugated diene polymers with narrow molecular weight distribution and polymer produced Conjugated diene polymers having good wear resistance, mechanical properties, storage stability, processability and a reduced cold flow are produced by polymerizing a conjugated diene compound with a catalyst of rare earth element compound, a compound containing at ... | 11/13/2007 |
| 7291575 | Active, heterogeneous bi- or tri-dentate catalyst A catalyst composition, and olefin polymerization process using same, formed from a mixture of a non-aluminoxane aluminum compound, an inorganic oxide and a transition metal bidentate or tridentate complex in certain prescribed proportions. The composition can be fo... | 11/06/2007 |
| 7288596 | Polyethylene compositions having improved tear properties Disclosed are various compositions, including but not limited to a high density multimodal polyethylene composition, that has a density of 0.935 g/cc or more, and that includes a blend of a first polyethylene component and a second polyethylene component, in which: ... | 10/30/2007 |
| 7282544 | Olefin polymerisation process in the presence of an anti-fouling agent A propylene polymerisation process carried out in the presence of an anti-fouling agent; characterised in that the anti-fouling agent comprises an anti-fouling polymer containing: (1) one or more blocks —(CH2—CH... | 10/16/2007 |
