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| Number | Title | Issue Date |
| 8177535 | Method for timing a polymer pump containing polymer A method for restoring the registry of opposed shafts that carry meshing pump teeth inside a polymer pump that contains polymer without removing polymer from within the pump, the method using an asymmetric pattern of apertures in the shaft ends and a template having... | 05/15/2012 |
| 8158733 | Catalysts based on 2-(2-aryloxy)quinoline or 2-(2-aryloxy)dihydroquinoline ligands Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a Group 4 metal complex that incorporates a dianionic, tridentate 2-(2-aryloxy)quinoline or 2-(2-aryloxy)dihydroquinoline ligand. In one aspect, supported catalysts are ... | 04/17/2012 |
| 8153544 | Method for preparing non-metallocene catalysts A method of preparing supported catalysts useful for olefin polymerization is described. The catalysts comprise a Group 4 metal complex that incorporates a tridentate dianionic ligand. An activator mixture is first made from a boron compound having Lewis acidity and... | 04/10/2012 |
| 8114493 | Polyethylene pipe resins Disclosed is a pipe resin composition. The composition comprises a polyethylene pipe resin, a primary antioxidant, and an acid. The composition of the invention has an increased oxidative induction time (OIT) and environmental stress cracking resistance (ESCR). ... | 02/14/2012 |
| 8053085 | Heat-shrinkable film A multilayer heat-shrinkable film having an uncommon but valuable combination of properties is disclosed. The film comprises a core layer of HDPE. Each skin layer comprises linear low density polyethylene (LLDPE), low density polyethylene (LDPE), or mixtures thereof... | 11/08/2011 |
| 8034461 | Preparation of multilayer polyethylene thin films A method for making multilayer thin films is disclosed. The method of comprises orienting a thick multilayer film in the machine direction at a drawdown ratio effective to produce a multilayer thin film. The thick multilayer film has a thickness within the range of ... | 10/11/2011 |
| 8017708 | Nitroso-modified Ziegler-Natta catalyst system A modified Ziegler-Natta catalyst system, a method for preparing the catalyst system, and a process for polymerizing an olefin in the presence of the catalyst system are disclosed. The catalyst system comprises a titanium compound, an aluminum compound, and a nitros... | 09/13/2011 |
| 7951883 | Preparation of multimodal, high density, ethylene homopolymer barrier resins and films Disclosed is a multimodal, high density, homopolyethylene barrier resin. The resin is preferably made by a multistage process. The process comprises a first stage in which ethylene is homopolymerized in the presence of a Ziegler-Natta catalyst, organoaluminum cocata... | 05/31/2011 |
| 7951743 | Preparation of ultra high molecular weight linear low density polyethylene Disclosed is a method of preparing an ultra-high molecular weight, linear low density polyethylene with a catalyst system that comprises a bridged indenoindolyl transition metal complex, a non-bridged indenoindolyl transition metal complex, an alumoxane activator an... | 05/31/2011 |
| 7932323 | Polyolefin-based adhesives having improved oxidative stability Disclosed is an adhesive composition. The adhesive composition comprises a polyolefin, a maleated polyolefin, a Bronsted acid, and an antioxidant. The adhesive composition has improved oxidative stability compared with those which do not contain Bronsted acids. ... | 04/26/2011 |
| 7931466 | Flare gas flammability control A plant gas to be flared in the atmosphere is periodically sampled and analyzed as to its Btu content, a first comparison made of 1) the most recent of such analyses with 2) a predetermined steady state set point, a second comparison made of 3) an average of a plura... | 04/26/2011 |
| 7878700 | Polymer removal from a polymer mixer A method and apparatus for controlling the removal of polymer from a mixer using an outlet gate that is coupled to an actuator by way of a pair of flanges, one flange carrying a protuberance and the other flange carrying a depression into which the protuberance fits... | 02/01/2011 |
| 7871952 | 2-hydroxypyridine N-oxide-modified ziegler-natta catalyst system A modified Ziegler-Natta catalyst system, a method for preparing the catalyst system, and a process for polymerizing an olefin in the presence of the catalyst system are disclosed. The catalyst system comprises a titanium or vanadium compound, an aluminum compound, ... | 01/18/2011 |
| 7871709 | Modified tie-layer compositions and improved clarity multi-layer barrier films produced therewith Tie-layer adhesive compositions which are blends of modified and unmodified polyolefins and containing a saturated bicyclic modifier compound and multi-layer barrier films having improved clarity produced therewith are provided. ... | 01/18/2011 |
| 7858834 | Olefin production utilizing a feed containing condensate and crude oil A method for utilizing a feed comprising condensate and crude oil for an olefin production plant is disclosed. The feed is subjected to vaporization and separated into vaporous hydrocarbons and liquid hydrocarbons. The vaporous hydrocarbons stream is thermally crack... | 12/28/2010 |
| 7858718 | Catalysts based on 2-aryl-8-anilinoquinoline ligands Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a Group 4 metal complex that incorporates a dianionic, tridentate 2-aryl-8-anilinoquinoline ligand. In one aspect, supported catalysts are prepared by first combining a ... | 12/28/2010 |
| 7855255 | Preparation of multimodal polyethylene Disclosed is a polyethylene composition. The composition comprises single-site multimodal resin A and single-site multimodal resin B, wherein resin A differs from resin B in molecular weight, in monomeric composition, in density, in long chain branch concentration o... | 12/21/2010 |
| 7829641 | Process for the preparation of multimodal polyethylene resins A two-stage cascade polymerization process for the production of multimodal polyethylene film resins with improved bubble stability is provided. The process comprises polymerizing ethylene or a mixture of ethylene and a C4-8 α-olefin in two reactors arra... | 11/09/2010 |
| 7816478 | Polyethylene thick film and process for preparing polyethylene A thick film and process to prepare polyethylene useful for the film are disclosed. Ethylene is polymerized in two reaction zones with a C6-C10 α-olefin in the presence of a catalyst system comprising an activator, a supported bridged zirconiu... | 10/19/2010 |
| 7794848 | MDO multilayer polyethylene film A multilayer film and a method of making the film are disclosed. In the method a multilayer film is post-oriented uniaxially in the machine direction resulting in a film that has a water vapor transmission rate of less than 2.5 g-mil/m2-day and an oxygen ... | 09/14/2010 |
| 7786227 | Monomer concentration prediction and control in a polymerization process A method for the control of a polymerization process, which method employs the combination of a densitometer measurement of the polymerization reaction mixture and a quadratic computer model. ... | 08/31/2010 |
| 7781549 | Olefin polymerization process A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin and a catalyst comprising an activator and a supported bridged indeno[1,2-b]indolyl zirconium complex. The process produces polyethyl... | 08/24/2010 |
| 7776974 | Olefin polymerization process A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in a first reactor in the presence of hydrogen and a catalyst comprising an activator and a supported dimethylsilyl-bridged indeno[1,2-b]indolyl zirconium complex to... | 08/17/2010 |
| 7767767 | Modification of polyethylene with ozone A method of modifying polyethylene is disclosed. The method comprises contacting the polyethylene powder with ozone. The modified polyethylene exhibits an increase in melt elasticity and the complex viscosity at low shear rates. The rheological benefits are achieved... | 08/03/2010 |
| 7750086 | Solid state modification of propylene polymers A process for improving the melt characteristics of propylene-ethylene random block and impact copolymers is provided. The process involves contacting a powder of the copolymer with a low level of free radical initiator followed by heating at a temperature below the... | 07/06/2010 |
| 7744747 | Olefin production utilizing whole crude oil/condensate feedstock with a partitioned vaporization unit A method for thermally cracking a feed composed of whole crude oil and/or natural gas condensate using a partitioned vaporizer to gasify the feed before cracking same. ... | 06/29/2010 |
| 7741993 | Method for locating the surface of a polymer particle bed A method for determining the level of a bed of polymer particles in a vessel comprising providing water wet polymer particles and employing a guided wave radar probe unit carrying a pair of radar active probes spaced from the guided wave radar probe unit by a radar ... | 06/22/2010 |
| 7723451 | Olefin polymerization process A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin, hydrogen, and a catalyst comprising an activator and a supported, dimethylsilyl-bridged bis(indenoindolyl)zirconium complex. The pro... | 05/25/2010 |
| 7718841 | Extractive distillation A method for reducing corrosion in a diolefin extractive distillation process comprising preventing the formation of ammonium carbonate by promoting the formation of a carbonate salt that does not dissociate in the ammonium carbonate dissociation temperature range o... | 05/18/2010 |
| 7717433 | Dynamic seal assembly A dynamic seal assembly for a rotating member comprising a first split housing carrying a first split seal, a second split housing carrying at least one second split seal, each split seal being resiliently closed so that sealing contact is maintained when the rotati... | 05/18/2010 |
| 7709693 | Toluene production A method for optimizing the production of nitration grade toluene from a solvent extraction process that produces an aromatic rich extract and a saturate rich raffinate, comprising adding an effective amount of the raffinate back to the extract. ... | 05/04/2010 |
| 7709585 | Ethylene recovery from a polymerization process A method for solution polymerizing ethylene wherein an ethane purge stream is separated, subjected to high efficiency cryogenic distillation, and a side cut from that distillation recycled to the polymerization process while the overhead and bottoms from that distil... | 05/04/2010 |
| 7687575 | Propylene elastomer-containing adhesive blends Adhesive blends suitable for use as tie-layer adhesives for a variety of substrates used in multi-layer film and sheet constructions are provided. The adhesive blends contain a polyolefin base resin, a functionalized polyolefin and a propylene elastomer containing i... | 03/30/2010 |
| 7671151 | Olefin polymerization process A process for making polyethylene having an uncommon but valuable balance of broad molecular weight distribution and a low level of long-chain branching is disclosed. The process comprises polymerizing ethylene in a single reactor in the presence of an α-olefin and... | 03/02/2010 |
| 7666961 | Olefin polymerization process A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin and a catalyst comprising an activator and a supported bridged bis-indeno[2,1-b]indolyl zirconium complex. The process uses a highly ... | 02/23/2010 |
| 7666960 | Process for the production of ethylene copolymers A process for the copolymerization of ethylene and α-olefins which utilizes a mixed modifier comprised of a conjugated diene and alkoxysilane is disclosed. ... | 02/23/2010 |
| 7659346 | Process for maleating polymerization residues and products A process for converting distillation residues obtained from polymerization processes to useful maleated products is provided. ... | 02/09/2010 |
| 7655740 | Olefin polymerization process A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin and a catalyst comprising an activator and a supported bridged indeno[1,2-b]indolyl zirconium complex. The process produces polyethyl... | 02/02/2010 |
| 7638597 | Removal of metal contaminants from polyethylene A process to remove metal contaminants from a hydrocarbon solution of polyethylene is disclosed. The process comprises adding a primary alcohol and a β-diketone to a solution of polyethylene at a temperature within the range of 120° C. to 300° C. and contacting t... | 12/29/2009 |
| 7638586 | Olefin polymerization process A process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in a slurry reaction in the presence of a catalyst system which comprises an activator and an indenoindolyl transition metal complex on a support material. The catalyst sys... | 12/29/2009 |
