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| Number | Title | Issue Date |
| 7910669 | Methods of preparing a polymerization catalyst A method comprising (a) contacting a support and a chromium-containing compound to form chromium-containing support, (b) heat treating the chromium-containing support in an oxidizing atmosphere to form a treated support, (c) contacting the treated support with carbo... | 03/22/2011 |
| 7691955 | 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... | 04/06/2010 |
| 7563851 | Production of broad molecular weight polyethylene The present invention is directed to the use of aluminum alkyl activators and co-catalysts to improve the performance of chromium-based catalysts. The aluminum alkyls allow for the variable control of polymer molecular weight, control of side branching while possess... | 07/21/2009 |
| 7504463 | Production of broad molecular weight polyethylene The present invention is directed to the use of aluminum alkyl activators and co-catalysts to improve the performance of chromium-based catalysts. The aluminum alkyls allow for the variable control of polymer molecular weight, control of side branching while possess... | 03/17/2009 |
| 7485685 | Plastics pipes of polyolefins Plastics pipes comprise polyolefins which can be prepared by means of a fluorine-modified chromium catalyst and are used for transporting gases and liquids. ... | 02/03/2009 |
| 7388059 | Ethylene polymer, catalyst for producing thereof and method for producing thereof A method for producing an ethylene polymer which comprises continuously polymerizing ethylene alone or copolymerizing ethylene and a C3-C8 α-olefin by multistage polymerization in a plurality of polymerization reactors connected in series in t... | 06/17/2008 |
| 7375169 | Method for catalyst preparation and improved polyethylene blow molding resin A method for polymerizing ethylene is provided. The method can include preparing a supported catalyst composition comprising the steps of: (a) dehydrating a chromium impregnated support; (b) at least partially dissolving a titanium-containing compound in one or more... | 05/20/2008 |
| 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 |
| 7348388 | Copolymers of olefins and vinyl- and allylsilanes Ethylene and allyl- or vinylsilanes are efficiently copolymerized by certain late transition metal complexes containing selected bidentate or tridentate ligands. The resulting novel polymers may be crosslinked by moisture when vinylsilane contains groups bound to si... | 03/25/2008 |
| RE40140 | Polymerization catalyst used for producing polyolefins that have excellent combined properties 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 solu... | 03/04/2008 |
| 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 |
| 7307133 | Polymers having broad molecular weight distributions and methods of making the same Methods of polymerizing at least one olefin include contacting the olefin with a catalyst comprising chromium and with a cocatalyst comprising a non-transition metal cyclopentadienyl (Cp) compound. The polymerization may be performed in the presence of hydrogen. Usi... | 12/11/2007 |
| 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 |
| 7268194 | Continuous slurry polymerization process and apparatus A process of converting a loop reactor into multiple loop reactors comprising starting with a loop reactor comprising at least 8 vertical legs, at least two non-vertical conversion runs, each non-vertical run connected in fluid flow communication with two vertical l... | 09/11/2007 |
| 7268195 | Mesoporous catalyst support, a catalyst system, and method of making and using same for olefin polymerization This invention relates to a catalyst system comprising a catalyst and a support comprising a non-layered inorganic porous crystalline phase material, wherein the support comprises a hexagonal arrangement of uniformly-sized pores having an average pore diameter great... | 09/11/2007 |
| 7230054 | Polymer resins with improved environmental stress crack resistance Resins comprising a relatively high-density, low-molecular-weight polyethylene component and a relatively low-density, high-molecular-weight ethylene copolymer component and methods of making the resins are disclosed. The rheological polydispersity of the high-densi... | 06/12/2007 |
| 7223823 | Catalyst system and process This invention relates to a process of polymerizing ethylene in a reactor comprising contacting a catalyst system comprising a supported chromium catalyst and an aluminum alkyl cocatalyst, where the catalyst and cocatalyst are contacted by cofeeding the catalyst and... | 05/29/2007 |
| 7214642 | Methods of preparing active chromium/alumina catalysts via treatment with sulfate Methods of preparing a polymerization catalyst are provided that include contacting a support comprising alumina with a sulfating agent and with chromium. In an embodiment in which the chromium is provided from a chromium compound such as chromium oxide, the support... | 05/08/2007 |
| 7208441 | Polymerization catalyst systems and processes therefor and therewith A copolymer of ethylene and a higher alpha olefin, preferably 1-hexene, can be produced using an activated chromium containing catalyst system and a cocatalyst selected from the group consisting of trialkylboron, trialkylsiloxyalutninum, and a combination of trialky... | 04/24/2007 |
| 7192901 | Method of preparing a treated support This invention relates to a method of preparing a supported catalyst comprising the steps of contacting a solid titanium or solid aluminum compound with a supported catalyst compound, and heating the combination to at least 150° C. ... | 03/20/2007 |
| 7157538 | Covalently-bound, hydrophilic coating compositions for surgical implants Covalently-bound, hydrophilic copolymer coatings for implants are disclosed. The copolymer coatings comprise a hydrophobic aryl acrylic monomer, a hydrophilic monomer selected from the group consisting of hydroxyalkyl (meth)acrylates, n-vinyl pyrrolidone and acrylam... | 01/02/2007 |
| 7151073 | Mesoporous catalyst support, a catalyst system, and method of making and using same for olefin polymerization This invention relates to a catalyst system comprising a catalyst and a support comprising a non-layered inorganic porous crystalline phase material, wherein the support comprises a hexagonal arrangement of uniformly-sized pores having an average pore diameter great... | 12/19/2006 |
| 7112643 | Polymers having low levels of long chain branching and methods of making the same Methods of producing a polymer include contacting at least one olefin with a catalyst prepared by contacting a support comprising alumina with a sulfating agent and with chromium. Polymer compositions produced in this manner may exhibit relatively low levels of long... | 09/26/2006 |
| 7105690 | Method for producing transition metal compounds and their use for the polymerization of olefins The invention relates to a method for producing special transition metal compounds, to novel transition metal compounds and to their use for the polymerization of olefins. ... | 09/12/2006 |
| 7087686 | 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... | 08/08/2006 |
| 7067598 | Process for the continuous gas-phase (co-)polymerisation of olefins in a fluidised bed reactor The present invention relates to a process for the gas-phase (co-)polymerization of olefins in a fluidized bed reactor using a chromium oxide catalyst characterized in that the polymerization is performed in the presence of a polymer structure modifier. ... | 06/27/2006 |
| 7019089 | Suspended chrome catalyst containing titanium and the use thereof for producing ethylene homopolymers and copolymers Novel supported, titanized chromium catalysts can be used for the homopolymerization of ethylene and the copolymerization of ethylene with α-olefins. ... | 03/28/2006 |
| 7009019 | Plastic hollow body made of high density polyolefins produced by means of a fluoro modified chrome catalyst A hollow plastic article is described, with at least one opening and with a structure which has one or more layers, the hollow plastic article comprising at least one layer made from a polyolefin which was prepared using a fluorine-modified chromium catalyst. The us... | 03/07/2006 |
| 6998451 | Olefin polymerization process A process for making polyolefins is disclosed. The process comprises polymerizing an olefin in the presence of an activator, an organometallic complex, and an aluminum phosphate support. The complex comprises a Group 3 to 10 transition metal and an indenoindolyl lig... | 02/14/2006 |
| 6982304 | Blow molding resins with improved ESCR Polyethylene resins having improved environmental stress crack resistance, stiffness and impact resistance is made by a process comprising feeding both a chromium oxide catalyst and a silyl chromium catalyst into a polymerization reactor. The chromium oxide catalyst... | 01/03/2006 |
| 6982238 | Supported catalyst The invention provides a supported chromium catalyst system comprising a chromium catalyst precursor bound via at least one heteroatom to a functionalised support, said heteroatom being connected to said support via an organic group. ... | 01/03/2006 |
| 6977235 | Catalyst systems comprising a calcined chromium catalyst and a non-transition metal cyclopentadienyl cocatalyst According to an embodiment, catalyst systems for polymerizing olefins include a catalyst comprising chromium and a cocatalyst comprising a substituted or unsubstituted non-transition metal cyclopentadienyl compound (Cp). The catalyst also comprises an inorganic oxid... | 12/20/2005 |
| 6921798 | Polymerization process Polymerization processes are disclosed for producing polyethylene having a target density and improved environmental stress resistance. Ethylene and optionally one or more α-olefin comonomers, supported chromium catalyst, and metal alkyl cocatalyst are contacted to... | 07/26/2005 |
| 6908202 | Bulk diffuser for flat panel display The invention features a bulk light diffuser material. The bulk light diffuser material may be a sheet or film comprising about 95 to about 99.8 percent by weight of polycarbonate and about 0.2 to about 2.5 percent by weight of a particulate light diffusing componen... | 06/21/2005 |
| 6897181 | Polymerization catalyst used for producing polyolefins that have excellent combined properties 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 solu... | 05/24/2005 |
| 6891001 | Process for the gas phase polymerization of olefins A process for preparing and controlling the density of high density polyethylene in the gas phase comprising contacting ethylene or a mixture of ethylene and one or more alpha-olefins with a chromium oxide catalyst supported on a granular or microspherical refractor... | 05/10/2005 |
| 6855781 | Process to produce polymers A process to produce ethylene polymers is provided. Particularly, a process to produce ethylene polymers having a broad molecular weight distribution is provided. More particularly, a process to produce ethylene polymers that have low formation of smoke and odor dur... | 02/15/2005 |
| 6849699 | Vapor-phase fluidized-bed process and ethylene homopolymers and copolymers produced thereby A continuous vapor-phase fluidized-bed process for the preparation of ethylene homopolymers and copolymers having a density of from 0.87 to 0.97 g/cm3 in which ethylene or mixtures of ethylene and C3-C8 a-monoolefins are (co)polymeri... | 02/01/2005 |
| 6833416 | Methods of polymerizing olefin monomers with mixed catalyst systems A method of transitioning catalysts for polyolefin polymerization is provided. In one aspect, the process includes providing a polymerization reactor that includes a first catalyst system, contacting olefin monomers with the first catalyst system to form polyolefin ... | 12/21/2004 |
| 6750302 | Organometal catalyst compositions A polymerization catalyst is disclosed, wherein the catalyst comprises: (a) a metallocene of Ti, Zr or Hf, (b) an organoaluminum compound, and (c) a treated solid oxide support which comprises fluorine and chromium. ... | 06/15/2004 |
