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| Number | Title | Issue Date |
| 8153068 | Method of using an upper discharge in a fluidized bed reactor and system thereof A method according to one embodiment includes operating a reactor or providing a reactor after operation, wherein the reactor includes a bottom section, a bed section above the bottom section, a distributor plate between the bottom section and the bed section, an ex... | 04/10/2012 |
| 8148481 | Method for seed bed treatment for a polymerization reaction A method for preparing a reactor for performance of a polymerization reaction, the method including providing at least one seed bed into the reactor; wherein the at least one seed bed includes at least one organometallic compound and polymer particles. ... | 04/03/2012 |
| 8129486 | Discharge systems and methods of using the same A discharge system for removing a solid/gas mixture from a fluidized bed pressure vessel is provided. The discharge system includes a fluidized bed pressure vessel, a settling vessel, a transfer vessel, discharge line, primary discharge valve, and primary exit valve... | 03/06/2012 |
| 8129485 | Integrated hydrocarbons feed stripper and method of using the same Systems and methods for removing a volatile catalyst poison from a liquid hydrocarbon are provided. In one embodiment, a process vent (106) can be introduced to a vent recovery system (108) to provide a recycle gas (110). A first portion of the ... | 03/06/2012 |
| 8129484 | Blow molding polyethylene resins Disclosed herein are various processes, including continuous fluidized-bed gas-phase polymerization processes for making a high strength, high density polyethylene copolymer, comprising (including): contacting monomers that include ethylene and optionally at least o... | 03/06/2012 |
| 8129483 | Circulating fluidized bed reactor A continuous gas phase circulating bed reactor, including: a riser for contacting a catalyst and a first gas composition comprising an olefin to form a polyolefin under fast-fluidization regime or a dilute-phase pneumatic conveying regime conditions; a downer for co... | 03/06/2012 |
| 8129481 | Methods for applying solution catalysts to reactor surfaces A method for treating at least one interior surface (for example, a bed wall) of a fluidized bed polymerization reactor system, including by applying a solution catalyst (preferably at least substantially uniformly and in liquid form) to each surface, and optionally... | 03/06/2012 |
| 8124696 | Method of using an upper discharge in a fluidized bed reactor and system thereof A method according to one embodiment includes operating a reactor or providing a reactor after operation, wherein the reactor includes a bottom section, a bed section above the bottom section, a distributor plate between the bottom section and the bed section, an ex... | 02/28/2012 |
| 8101691 | Systems and methods for fabricating polymers Disclosed herein are various methods and systems for gas and liquid phase polymer production. In certain embodiments, the methods comprise manipulating properties of polymers produced by adjusting the hydrogen feed rate. ... | 01/24/2012 |
| 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 |
| 8088870 | Methods for applying solution catalysts to reactor surfaces A method for treating at least one interior surface (for example, a bed wall) of a fluidized bed polymerization reactor system, including by applying a solution catalyst (preferably at least substantially uniformly and in liquid form) to each surface, and optionally... | 01/03/2012 |
| 8088704 | Polymerization catalysts and methods of using the same to produce polyolefin products Polymerization catalyst systems including three or more catalyst compounds are provided. Methods for olefin polymerization including the aforementioned catalyst systems are also provided. ... | 01/03/2012 |
| 8084560 | Polymerization processes using metallocene catalysts, their polymer products and end uses A process for the production of an ethylene alpha-olefin copolymer is disclosed, the process including polymerizing ethylene and at least one alpha-olefin by contacting the ethylene and the at least one alpha-olefin with a metallocene catalyst in at least one gas ph... | 12/27/2011 |
| 8084554 | Methods and devices for polymerization A method of treating a gas phase fluidized bed reactor and a method of polymerizing olefins in a gas phase fluidized bed reactor in the presence of a catalyst prone to cause sheeting by introducing a chromium-containing compound into the reactor and forming a high m... | 12/27/2011 |
| 8076262 | 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... | 12/13/2011 |
| 8067518 | Polymers made with metallocene catalysts, for use in rotomolding and injection molding products Ethylene alpha-olefin copolymers formed by contacting at least one supported metallocene catalyst, ethylene, and an alpha-olefin in a gas phase reactor are disclosed. In some embodiments, the polymer may have: a density of between 0.890 and 0.970 g/cc; a melt index ... | 11/29/2011 |
| 8067509 | Reactor systems and processes for using the same A process for the polymerization of olefin's, including: introducing an olefin and a polymerization catalyst into a polymerization reactor to form a polyolefin, the polymerization reactor including: a fluidized bed region having a top and a bottom; and a motive bed ... | 11/29/2011 |
| 8066423 | High speed and direct driven rotating equipment for polyolefin manufacturing An apparatus and method for melting polymer is provided. In at least one embodiment, the apparatus includes a housing, two or more rotatable members at least partially contained within the housing, where each rotatable member having a shaft coupled thereto. The appa... | 11/29/2011 |
| 8058366 | Polymerization monitoring and method of selecting leading indicators Embodiments of our invention relate generally to methods of monitoring and controlling polymerization reactions including reactions producing multimodal polymer products using multiple catalysts in a single reactor. Embodiments of the invention provide methods of ra... | 11/15/2011 |
| 8039562 | Method for seed bed treatment before a polymerization reaction In some embodiments, a method in which at least one continuity additive (“CA”) and a seed bed are pre-loaded into a reactor, and a polymerization reaction is optionally then performed in the reactor. In other embodiments, at least one flow improver, at least one... | 10/18/2011 |
| 8012903 | Methods to prepare catalyst compositions comprising small silica support materials Methods are provided to prepare a catalyst system that includes at least one titanium compound, at least one magnesium compound, at least one electron donor compound, at least one activator compound, and at least one silica support material, the at least one silica ... | 09/06/2011 |
| 7989564 | Catalyst systems and their use in polymerization processes A catalyst system comprising a hafnocene catalyst compound and zirconocene catalyst compound, wherein the hafnocene and/or zirconocene include(s) at least one ligand substituted with at least one linear or iso alkyl group having 3 or more carbon atoms is provided. A... | 08/02/2011 |
| 7989562 | Method for preventing catalyst agglomeration based on production rate changes A system and method for olefin polymerization is provided. The method includes polymerizing one or more olefins within a reactor having one or more injection tubes in fluid communication therewith, at least one of the one or more injection tubes having two or more c... | 08/02/2011 |
| 7985811 | Method for controlling sheeting in gas phase reactors Embodiments of the present invention relate to measuring and controlling static in a gas phase reactor polymerization. In particular, embodiments relate to monitoring carryover static in an entrainment zone during gas phase polymerization to determine the onset of r... | 07/26/2011 |
| 7980264 | Slurry catalyst flow splitters and methods of using the same A system for feeding a slurry catalyst composition including: a primary slurry feed system comprising a primary slurry flow meter and a primary catalyst injection device, wherein the primary slurry flow meter measures a primary slurry catalyst composition flow rate ... | 07/19/2011 |
| 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 |
| 7947797 | Method for operating a gas-phase reactor at or near maximum production rates while controlling polymer stickiness Embodiments of the present invention relate to operating a gas-phase reactor at or near maximum production rates and to measuring and controlling polymer stickiness in a gas phase reactor polymerization. In particular, embodiments relate to monitoring acoustic emiss... | 05/24/2011 |
| 7915357 | Blow molding polyethylene resins Disclosed herein are various processes, including continuous fluidized-bed gas-phase polymerization processes for making a high strength, high density polyethylene copolymer, comprising (including): contacting monomers that include ethylene and optionally at least o... | 03/29/2011 |
| 7910668 | Method for on-line determination of degree or onset of resin stickiness using acoustic data Provided is a method for monitoring a polymerization reaction in a fluid bed reactor to determine in on-line fashion a current value, and preferably also a limiting value, of a stickiness control temperature, and optionally controlling the reaction in response there... | 03/22/2011 |
| 7897706 | 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... | 03/01/2011 |
| 7892466 | Oxygen tailoring of polyethylene resins Methods of tailoring polyethylenes are contemplated utilizing 0.5 to 70 volume percent oxygen containing gases. The tailoring occurs in a melt-conveying zone of a mixer/extruder, and not in the feed or melting zones of a mixer/extruder. The effect of tailoring is to... | 02/22/2011 |
| 7891527 | Particulate solids injector An apparatus for feeding a dry particulate solid into a pressurized vessel including: a solids reservoir; a rotating metering disc below the solids reservoir; a non-rotating component adjacent to the metering disc; a surface of contact between the metering disc and ... | 02/22/2011 |
| 7847036 | Method for reducing and/or preventing production of excessively low density polymer product during polymerization transitions A method for controlling a transition from an initial polymerization reaction to a target polymerization reaction in a manner that reduces significantly the amount of off-grade product having excessively low density produced during the transition, including steps of... | 12/07/2010 |
| 7846736 | Method for polymerization reaction monitoring with determination of entropy of monitored data In some embodiments, a method of monitoring a resin-producing polymerization reaction in a fluid bed reactor system to generate reaction parameter data in on-line fashion, determining an indicator of at least one of entropy and complexity (for example, Kolmogorov or... | 12/07/2010 |
| 7878431 | Separator rotary feeder and method of using the same A rotary feeder for feeding a particulate material including: a cylindrical housing comprising a feeder inlet, a first feeder outlet, and a second feeder outlet; a rotor mounted in the cylindrical housing including a plurality of substantially impeller blades defini... | 02/01/2011 |
| 7875690 | Ethylene-alpha olefin copolymers and polymerization processes for making the same A process for the production of an ethylene alpha-olefin copolymer is disclosed. The process includes polymerizing ethylene and at least one alpha-olefin by contacting the ethylene and the at least one alpha-olefin with a metallocene catalyst in at least one gas pha... | 01/25/2011 |
| 7868092 | Bimodal polyethylene compositions for blow molding applications A bimodal polyethylene composition that includes ethylene-derived units, and, optionally, one or more other olefin-derived units, wherein the bimodal polyethylene composition possesses a density of at least 0.940 g/cc, an average molecular weight (Mw) of from 200,00... | 01/11/2011 |
| 7858702 | Enhanced ESCR bimodal HDPE for blow molding applications Bimodal polyethylene compositions and blow molded bottles made therefrom are provided. In at least one specific embodiment, the composition includes at least one high molecular weight polyethylene component having a molecular weight distribution (MWD) of about 6 to ... | 12/28/2010 |
| 7855253 | High density polyethylene and articles made therefrom Articles such as, for example, pipes or bottles, prepared from multimodal polyethylenes possessing a density from 0.940 to 0.965 g/cm3, and an I21 from 4 to 20 dg/min, and comprising a low molecular weight ethylene copolymer having a weight ave... | 12/21/2010 |
| 7838605 | Polymerization monitoring and control using improved leading indicators Embodiments of our invention relate generally to methods of monitoring and controlling polymerization reactions including reactions producing multimodal polymer products using multiple catalysts in a single reactor. Embodiments of the invention provide methods of ra... | 11/23/2010 |
