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| Number | Title | Issue Date |
| 7956138 | Catalyst system for olefin polymerization and polymers produced therefrom This invention relates to a catalyst system comprising: an activator, such as an aluminum alkyl, alumoxane or combinations thereof; a first catalyst precursor prepared by contacting compound (I) represented by the ... | 06/07/2011 |
| 7951881 | Polyethylene film having improved barrier properties and methods of making same A method comprising (a) providing a catalyst comprising chromium and a support having a pore volume of from about 1.7 ml/g to about 3.5 ml/g and a surface area of from about 450 m2/g to about 700 m2/g, (b) oxidizing the catalyst to form an oxid... | 05/31/2011 |
| 7381778 | 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 with a supported catalyst compound, and heating the combination to at least 150° C. ... | 06/03/2008 |
| 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 |
| 7368516 | Catalyst for trimerization of ethylene and process for trimerizing ethylene using the catalyst A catalyst used for trimerization of ethylene into 1-hexene is descrobed, which comprises (i) a specific organometallic complex having a neutral multidentate ligand having a tripod structure, (ii) an alkylaluminoxane, and an optional ingredient selected from: ... | 05/06/2008 |
| 7271124 | Process to produce polymers A process to produce ethylene polymers is provided. ... | 09/18/2007 |
| 7271122 | Multimodal polyethylene obtained with multilayer chromium catalyst The present invention concerns a catalyst for the production of high density polyethylene, by homopolymerising ethylene or copolymerising ethylene and an alpha-olefinic comonomer comprising 3 to 10 carbon atoms, prepared by the steps of: a) selecting a silica suppor... | 09/18/2007 |
| 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 |
| 7250474 | Physical blends of polyethylenes This invention discloses a process for the preparation of polyethylene resins having a narrow molecular weight distribution that comprises the steps of: (i) providing a first high molecular weight metallocene-produced linear low density polyethylene (mLLDPE) resin h... | 07/31/2007 |
| 7232551 | Fluidized bed method and reactor for the treatment of catalysts and catalyst carriers A method for the treatment of catalysts or catalyst carriers by: a) introducing and distributing a gas in the lower section of a reactor containing a catalyst or catalyst carrier bulk material; b) forming a fluidized bed in the reactor; c) treating the particles in ... | 06/19/2007 |
| 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 |
| 7202313 | Chromium-based catalysts in mineral oil for production of polyethylene A process for polymerizing polyethylene with chromium-based catalysts wherein one or more supported chromium-based catalysts is mixed with mineral oil to form a slurry and the slurry is then introduced into a polymerization reactor, especially a gas-phase polymeriza... | 04/10/2007 |
| 7166341 | Hot melt adhesives based on graft copolymers Water-soluble or water-dispersible hotmelt adhesives are prepared using graft copolymers produced by graft copolymerizing olefinically unsaturated monomers onto polyalkylene oxides. The adhesives additionally contain at least one resin which improves tackiness and t... | 01/23/2007 |
| 7129302 | Bimetallic catalyst for producing polyethylene resins with bimodal molecular weight distribution, its preparation and use Bimetallic catalyst for producing polyethylene resins with a bimodal molecular weight distribution, its preparation and use. The catalyst is obtainable by a process which includes contacting a support material with an organomagnesium component and carbonyl-containin... | 10/31/2006 |
| 7037999 | Mid-range vinylidene content polyisobutylene polymer product and process for producing the same A relatively low molecular weight, mid-range vinylidene content PIB polymer product and a process for making the same. At least about 90% of the PIB molecules present in the product comprise alpha or beta position isomers. The vinylidene (alpha) isomer content of th... | 05/02/2006 |
| 6989344 | Supported chromium oxide catalyst for the 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... | 01/24/2006 |
| 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 |
| 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 |
| 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 |
| 6815511 | Continuous withdrawal from high solids slurry polymerization An improved polymerization process includes withdrawing a portion of a fluid slurry through a plurality of active continuous take off mechanisms, monitoring the pressure of feed material fed to the reactor, and adjusting the continuous take off mechanisms in respons... | 11/09/2004 |
| 6806324 | High solids slurry polymerization using heat exchange to condense the flashed diluent An olefin polymerization process wherein monomer, diluent and catalyst are circulated in a continuous loop reactor and product slurry is recovered by means of a continuous product take off. The product slurry is exposed to a pressure drop in a flash zone, producing ... | 10/19/2004 |
| 6747085 | Conjugated diene polymer and rubber composition A conjugated diene polymer is produced by continuously polymerizing a conjugated diene monomer with a catalyst consisting essentially of specified components (a) to (c) and reacting with at least one of specified components (d) and (e) and has a content of cis-1,4-b... | 06/08/2004 |
| 6743869 | High polymer solids slurry polymerization employing 1-olefin comonomer An olefin polymerization process wherein monomer, at least one olefin comonomer different from the olefin monomer, diluent and catalyst are circulated in a continuous loop reactor and product slurry is recovered by means of a continuous product take off. The continu... | 06/01/2004 |
| 6734131 | Heterogeneous chromium catalysts and processes of polymerization of olefins using same A chromium containing catalyst wherein the chromium atom is in one of its higher valence states and is immobilized to a support-agglomerate composed of at least one inorganic oxide component and at least one ion-containing layered component. ... | 05/11/2004 |
| 6689829 | Process for imparting improved whiteness to polyolefin resins Hydroxyalkylamines can, in addition to imparting antistatic properties, significantly improve the color, i.e., the whiteness, of polyolefin resins produced with chromium-based catalysts and metallocene catalysts. Additionally, such compounds can impart im... | 02/10/2004 |
| 6670302 | High pore volume polyolefin catalyst High melt index polyolefins have been obtained with chromium silica catalysts under conventional polymerization conditions without the use of titanium or other additives. The useful chromium silica catalysts have a pore volume in the range of 1.9-2.9 cc/g... | 12/30/2003 |
| 6657023 | Polymerization process Polymerization processes for ethylene and at least one mono-1-olefin comonomer having from about three to eight carbon atoms per molecule in the presence of a twice-aged catalyst system comprising chromium supported on a silica-titania support and a trial... | 12/02/2003 |
| 6642324 | Process that produces polymers A process comprising polymerizing ethylene, or polymerizing ethylene and at least one other olefin, to produce a polymer is provided.... | 11/04/2003 |
| 6632897 | Use of nano-scaled metal oxide particles as polymerization catalysts Described is the use of nanoscale metal oxide particles as catalysts for the thermal and/or photochemical polymerization of species having at least one polymerizable carbon-carbon multiple bond and/or at least one carbon containing ring capable of undergo... | 10/14/2003 |
| 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 |
| 6583241 | Process for making MVTR resin The present invention is directed to producing a resin which, when formed into a film, has excellent gas barrier and/or moisture barrier (low MVTR) properties. Further, the resin has a relatively high molecular weight distribution, preferably above 6, and... | 06/24/2003 |
| 6531565 | MVTR resin produced with post-titanated Cr/Si/Ti catalyst A process is disclosed for producing polyethylene resin of broad molecular weight distribution, when formed into a film, high barrier to moisture (low MVTR (Moisture Vapor Transmission Rate) for the film). The resin is formed by polymerizing ethylene, pre... | 03/11/2003 |
| 6528565 | Process for imparting improved whiteness to polyolefin resins Hydroxyalkylamines can, in addition to imparting antistatic properties, significantly improve the color, i.e., the whiteness, of polyolefin resins produced with chromium-based catalysts and metallocene catalysts. Additionally, such compounds can impart im... | 03/04/2003 |
| 6518375 | Catalyst for the production of ethylene polymer and process for producing ethylene polymer A catalyst for the production of an ethylene polymer comprising a specific trivalent alkyl chromium compound, an inorganic oxide solid and optionally an organoaluminum compound (first catalyst), a catalyst for the production of an ethylene polymer compris... | 02/11/2003 |
| 6495638 | Process to produce polymers A process is provided to produce a catalyst system. The process comprises blending a first component and a second component. The first component of the catalyst system comprises chromium on a support. The amount of chromium on the support is from about 0.... | 12/17/2002 |
| 6489428 | Titanated chromium-based catalysts to produce polyethylene The present invention relates to a supported chromium-based catalyst titanated under specific conditions and used for the homopolymerisation or the copolymerisation of ethylene. The polyethylene obtained with this catalyst has high shear resirance and env... | 12/03/2002 |
| 6441110 | Method for producing halogen-free reactive polyisobutene A process for preparing halogen-free, reactive polyisobutene having a terminal double bond content of more than 50 mol % and an average molecular weight Mn of 280-10000 dalton by the cationic polymerization in the liquid phase of isobutene or h... | 08/27/2002 |
| 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 |
| 6384154 | Preparation of halogen-free, reactive polyisobutene A process for preparing halogen-free, reactive polyisobutene having a terminal double bond content of more than 60 mol % and an average molecular weight Mn of 800-3000 dalton by cationic polymerization in the liquid phase of isobutene over an a... | 05/07/2002 |
