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| Number | Title | Issue Date |
| 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 |
| 7262259 | Method of preparing a treated support This invention relates to a method to polymerize olefins comprising contacting a solid aluminum or solid titanium compound with a supported catalyst compound, heating the solid aluminum or solid titanium compound to cause the solid compound to vaporize, optionally a... | 08/28/2007 |
| 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 |
| 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 |
| 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 |
| 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 |
| 6908885 | Gel comprised of a poly-α-1,4-glucan and starch The invention relates to a gel based on poly-α-1,4-D-glucan and, optionally, on starch as well as on a swelling agent, to a method for the production thereof, and to the use of a gel of this type. ... | 06/21/2005 |
| 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 |
| 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 |
| 6649709 | Gas phase fluidized bed method and ethylene homo- and copolymers obtained using said method 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 ... | 11/18/2003 |
| 6646069 | Ethylene polymers and method for producing the same The invention relates to a method for producing an ethylene polymer, comprising performing polymerization of ethylene in co-presence of hydrogen using a trialkylaluminum compound-carried chromium catalyst, wherein the chromium catalyst is obtained by calc... | 11/11/2003 |
| 6639031 | Coreactive supporting materials for heterogenization of catalysts, cocatalysts and ligands The invention relates to a process for preparing a support material having an increased number of reactive groups and to a process for preparing coreactive surfaces that may have catalytic or cocatalytic properties.... | 10/28/2003 |
| 6639028 | Process for the continuous gas-phase (co-)polymerization of olefins in a fluidized bed reactor A process for the gas-phase (co-)polymerization of olefins in a fluidized bed reactor using a chromium oxide catalyst. The polymerization is performed in the presence of a process aid additive.... | 10/28/2003 |
| 6632896 | Ethylene polymerization Ths invention provides a process for the preparation of a polyethylene, in particular an HDPE suitable for blow moulding of HIC, which comprises polymerizing ethylene and, optionally an ethylenically unsaturated comonomer copolymerizable therewith, in the... | 10/14/2003 |
| 6617404 | Chromium phyllosilicate clay -olefin catalysts A process for preparing pillared chromium phyllosilicate clay -olefin catalysts is disclosed. This process utilizes palygorskite and sepiolite clays. The pillaring of said clays comprises the steps of: (a) preparing a hydrolyzed first solution by d... | 09/09/2003 |
| 6600011 | Process for purification and drying of polymer hydrogels This invention relates to a method for purifying and drying a polymer hydrogel. This invention is based in part upon the discovery that rapid drying of polymer hydrogels can eliminate the problem of unacceptable levels of soluble oligomers caused by prolo... | 07/29/2003 |
| 6541581 | Polyethylenes obtained by use of dual site catalyst A polyethylene produced by the homopolymerisation of ethylene or copolymerisation of ethylene with -olefins in the presence of a catalyst, characterized in that the fraction of low molecular weight polymers having MW | 04/01/2003 |
| 6465586 | Polymerization catalyst and process An olefin polymerization process is provided comprising contacting an olefin monomer with chromium oxide on a titanium containing silica support having less than about 3 weight percent titanium in combination with an organoboron promoter. Polymers thus pr... | 10/15/2002 |
| 6423792 | Production of polyethylene A process for producing a polyethylene resin having a monomodal molecular weight distribution in a single polymerisation reactor using a chromium-based catalyst system, by copolymerising ethylene and an alpha-olefinic-comonomer having from 3 to 8 carbon a... | 07/23/2002 |
| 6417131 | Production of polyethylene having a broad molecular weight distribution A process for producing high density polyethylene having a bimodal molecular weight distribution, the process comprising pre-contacting a chromium-based catalyst with an alkyl metal oxane, the chromium-based catalyst comprising chromium oxide on a silica-... | 07/09/2002 |
| 6407192 | Production of polyethylene for blow molding A process for producing high density polyethylene suitable for blow molding and having high environmental stress cracking resistance and rigidity copolymerizing ethylene and an alpha-olefinic comonomer comprising from 3 to 10 carbon atoms, in the presence... | 06/18/2002 |
| 6372867 | Process for the gas phase polymerization of olefins An improved chromium oxide-based catalyst supported on a granular or microspherical refractory oxide for the gas phase polymerization of at least one alpha olefin containing from 2 to 12 carbon atoms, wherein the supported chromium oxide-based catalyst ha... | 04/16/2002 |
| 6150480 | Production of polyethylene for blow molding A process for producing high density polyethylene suitable for blow molding and having high environmental stress cracking resistance and rigidity, comprising copolymerizing ethylene and a C3 -C10 alpha-olefinic comonomer in the prese... | 11/21/2000 |
| 6040399 | Preparation method of ethylene base polymer An ethylene base polymer and a preparation method of an ethylene base polymer characterized in use of a catalyst comprising a chromium amide compound, a solid inroganic oxide calcined at 100 to 500° C. and alumoxane. According to the present invention, a... | 03/21/2000 |
| 5866661 | Ethylene polymerization processes and products thereof A process to control the heat transfer coefficient in slurry olefin polymerization processes comprising shocking the polymerization reactor is provided. This shock comprises quickly decreasing and then restoring to normal operating conditions, the higher ... | 02/02/1999 |
| 5863854 | Catalyst system for olefin polymerization and process for the polymerization of at least one olefin in the presence of this catalyst system A catalyst system for olefin polymerization, including a catalytic solid based on chromium deposited on a support containing silica, alumina and aluminium phosphate and a cocatalyst chosen from organoaluminium compounds. One of the essential characteristi... | 01/26/1999 |
| 5852144 | Catalyst compositions and catalytic processes Catalyst compositions are provided that comprise (a) discrete silica particles; (b) chromium; and (c) a support comprising silica. These composition are useful in polymerizing ethylene or copolymerizing ethylene with a comonomer and provide better control... | 12/22/1998 |
| 5654249 | Chromium catalyst compositions and polymerization processes therewith Chromium catalyst compositions are provided. These chromium catalyst compositions comprise at least two chromium catalyst systems that have a certain amount of chromium and a support that comprises silica and titania. the supports have certain pore volume... | 08/05/1997 |
| 5599887 | Chromium catalyst compositions and ethylene polymerization processes therewith This invention provides a chromium catalyst system that comprises [a] a support that comprises silica, wherein said support has a surface area to pore volume relationship as follows 0.5ࣘPore volumeࣘf(SA) wherein said f(SA) is (1.14×10-7)(SA)3 | 02/04/1997 |
| 5557021 | Phillips catalyst and its use for the preparation of ethylene/-olefin copolymers A novel Phillips catalyst for the copolymerization of ethylene with -olefins, contains, as a catalytically active component, a finely divided, aluminum silicate-supported, phosphorus-containing chromium catalyst. This can be prepared by applying at... | 09/17/1996 |
| 5393719 | Catalysts for olefin polymerization Olefins can be polymerized in the presence of a catalyst system composition comprising chromium oxides supported on a inorganic oxide support, a pyrrole-containing compound and a non-hydrolyzed metal alkyl. The use of this type of polymerization catalyst ... | 02/28/1995 |
| 5364915 | Ethylene polymerization process A process to produce a polyethylene composition that has less than 2 weight percent fines, based on the weight of said polyethylene composition, and a fluff bulk density greater than 25 pounds per cubic foot, said process comprising polymerizing ethylene ... | 11/15/1994 |
| 5360879 | Polymerization catalysts and processes Supported olefin polymerization catalyst systems can be produced using waste chromium compounds. Olefin polymers can be prepared using a catalyst system composition comprising a waste chromium compound and an alkyl aluminum compound, both supported on an ... | 11/01/1994 |
| 5331070 | Process for olefin polymerization Olefins can be polymerized in the presence of a catalyst system composition comprising chromium supported on an inorganic oxide support, a pyrrole-containing compounds, and a metal alkyl. The use of this type of polymerization process can produce an olefi... | 07/19/1994 |
| 5324697 | Phillips catalyst and its use for preparing ethylene homopolymers and copolymers A novel Phillips catalyst for the homopolymerization of ethylene and the copolymerization of ethylene with -olefins contains as catalytically active components a specific chromium catalyst on an aluminum phosphate support and cocatalysts of the for... | 06/28/1994 |
| 5284926 | Catalyst system and process An ethylene polymerization catalyst system is provided. This catalyst system is produced by the process comprising forming an activated and reduced composition that is substantially free of titania and that comprises a fluorine compound, a chromium compou... | 02/08/1994 |
| 5198400 | Mixed chromium catalysts and polymerizations utilizing same Mixed catalyst compositions comprised of a first supported chromium-containing catalyst component and a second supported chromium-containing catalyst component and which additionally have one or more metallic or non-metallic catalytic agents associated th... | 03/30/1993 |
