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| Number | Title | Issue Date |
| 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 |
| 7300988 | Single catalyst low, medium and high density polyethylenes A method of polymerizing olefins comprising combining in one embodiment ethylene and optionally one or more α-olefins with a catalyst composition in a continuous polymerization reactor at a pressure of less than 10,000 kPa; wherein the catalyst composition comprise... | 11/27/2007 |
| 7291758 | Process for the production of highly reactive polyisobutenes The present invention relates to a process for the production of highly reactive polyisobutenes with a content of terminal vinylidene groupings of greater than 80 mol % and an average molecular weight of 500 to 10,000 Dalton by cationic polymerization of isobutene o... | 11/06/2007 |
| 7235509 | Processes for the recovery and recycling of boron trifluoride or complexes thereof The invention provides processes for the recovery of a catalyst which are to be applied to the reactions wherein boron trifluoride or a complex thereof is used as the catalyst, that is, (I) a process for the recovery of a catalyst which comprises using as the reacti... | 06/26/2007 |
| 7223825 | Single catalyst low, medium and high density polyethylenes A method of polymerizing olefins comprising combining in one embodiment ethylene and optionally one or more α-olefins with a catalyst composition in a continuous polymerization reactor at a pressure of less than 10,000 kPa; wherein the catalyst composition comprise... | 05/29/2007 |
| 7217676 | Hydrophobization and silica for supported catalyst This invention relates to a catalyst support comprising the result of the combination of: (a) a support comprising hydroxyl groups; (b) a capping agent comprising a boron containing Lewis acid; and (c) an ionic activator, where... | 05/15/2007 |
| 7179876 | High tear films from hafnocene catalyzed polyethylenes A polyethylene film having a balance of improved physical and mechanical properties and a method for making the same are provided. In one aspect, the film includes a 1% secant modulus of greater than 25,000 psi, a dart impact resistance of greater than 500 g/mil, an... | 02/20/2007 |
| 7172816 | High tear films from hafnocene catalyzed polyethylenes A polyethylene film having a balance of improved physical and mechanical properties and a method for making the same are provided. In one aspect, the film includes a 1% secant modulus of greater than 25,000 psi, a dart impact resistance of greater than 500 g/mil, an... | 02/06/2007 |
| 7157530 | Catalyst system for controlled polymerization Disclosed is a process for the removal and recycle of a supported transition metal catalyst complex from a polymerization reaction medium comprising the steps separating the supported transition metal catalyst from the reaction medium and contacting the supported tr... | 01/02/2007 |
| 7157549 | Polymerization of oxiranes with a lithium-containing initiator A method is provided for polymerizing oxiranes by employing a lithium-containing polymerization initiator in a liquid reaction medium devoid of polymerization additives. Linear and star polymers can be produced by practicing the subject method. ... | 01/02/2007 |
| 7105602 | Processing aid for thermoplastic resin and thermoplastic resin composition containing the same The present invention provides a processing aid for thermoplastic resin having a weight average molecular weight of 10,000 to 300,000, which is obtained by polymerizing an alkyl (meth)acrylate, or an alkyl (meth)acrylate and another vinyl monomer copolymerizable the... | 09/12/2006 |
| 7094724 | Catalytic solid supported on calcined hydrotalcite for olefinic polymerisation Catalyst solid for olefin polymerization comprising A) at least one calcined hydrotalcite and B) at least one organic transition metal compound, and also a catalyst system comprising the catalyst solid, the use of the catalyst sol... | 08/22/2006 |
| 7091267 | Resinous compositions, method of manufacture thereof and articles fabricated from the composition Disclosed are resinous compositions with excellent balance of impact, heat, flow and environmental stress crack resistance, comprising (i) at least one aromatic polycarbonate, (ii) at least one low molecular weight hydrocarbon resin derived from petroleum C5 | 08/15/2006 |
| 7078467 | Single catalyst low, medium and high density polyethylenes A method of polymerizing olefins comprising combining in one embodiment ethylene and optionally one or more α-olefins with a catalyst composition in a continuous polymerization reactor at a pressure of less than 10,000 kPa; wherein the catalyst composition comprise... | 07/18/2006 |
| 7074971 | Recovery of ethylene and propylene from a methanol to olefin reaction system The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane, ethylene, propylene, dimethyl ether, and one or more of propane, acetyl... | 07/11/2006 |
| 7071275 | Polyisobutene and polyisobutene derivatives for use in lubricant compositions The invention describes polyisobutenyl derivatives of succinic acid obtainable by: i) reacting a polyisobutene which has a reactive end group content of at least 80% and whose molecular weight distribution is characterized by a maximum MP in the distribut... | 07/04/2006 |
| 7053157 | Method for production of multimodal polyolefins of tunable composition, molecular weight, and polydispersity The present invention relates to a method of producing multimodal polyolefins using at least one or more activated metallocene catalysts. The activated metallocene catalysts are used in combination in a single-process method. The method allows for the production of ... | 05/30/2006 |
| 7041759 | Method for the preparation of well-defined metal acetamidinate-based catalysts on solid supports An olefin polymerization pre-catalyst, an activated catalyst and a process for preparing the catalysts are described herein. The pre-catalyst has the formula: wherein the groups M and R1–R4 | 05/09/2006 |
| 7041750 | Process and apparatus for making supported catalyst systems for olefin polymerization A process to support a homogeneous catalyst on a porous solid support is performed in two separate zones. In the first zone the solid is contacted, under stirring, with an amount of a catalyst solution lower than the total pore volume of the solid. In the second zon... | 05/09/2006 |
| 7026433 | Continuous bioreactor process for the preparation of polyester cyclic oligomers A continuous process for the process for the enzyme-catalyzed preparation of cyclic ester oligomers from linear ester oligomers. The process may use a linear or recirculating reactor. ... | 04/11/2006 |
| 6992152 | Apparatus and method for controlling olefin polymerization process Apparatus for olefin polymerization includes one or more shell and tube olefin polymerization reactors, each of which has an olefin polymerization reaction mixture inlet connection and a crude polyolefin product outlet connection. Each reactor is equipped with a rec... | 01/31/2006 |
| 6979720 | manufacture of certain cyclic ester oligomers Enzymes which are capable of catalyzing esterifications and/or transesterifications such as selected lipases and esterases can, under specified conditions, convert certain lower linear oligomers of polyesters to their cyclic ester oligomers in quantities greater tha... | 12/27/2005 |
| 6979752 | Continuous process for converting polytetramethylene ether diester to polytetramethylene ether glycol A continuous process for converting by transesterification the diester of polytetramethylene ether (PTMEA) to the corresponding polytetramethylene ether glycol (PTMEG). The process is characterized by the fact that the feed, consisting of PTMEA along with an alkanol... | 12/27/2005 |
| 6936675 | High tear films from hafnocene catalyzed polyethylenes A polyethylene film having a balance of improved physical and mechanical properties and a method for making the same are provided. In one aspect, the film includes a 1% secant modulus of greater than 25,000 psi, a dart impact resistance of greater than 500 g/mil, an... | 08/30/2005 |
| 6867267 | Petroleum resins and their production with BF3 catalyst Petroleum resins are produced using a supported BF3 cocatalyst complex. Preferably the cocatalyst is organic such as an alcohol or a carboxylic acid. Use of the catalyst in supported form together with the cocatalyst enables control over both Bronsted and... | 03/15/2005 |
| 6479598 | Petroleum resins and their production with BF3 catalyst Petroleum resins are produced using a supported BF3 cocatalyst complex. Preferably the cocatalyst is organic such as an alcohol or a carboxylic acid. Use of the catalyst in supported form together with the cocatalyst enables control over both B... | 11/12/2002 |
| 6476171 | Easy processing linear low density polyethylene A polymer of ethylene and at least one alpha olefin having at least 5, carbon atoms obtainable by a continuous gas phase polymerization using supported catalyst of an activated molecularly discrete catalyst such as a metallocene in the substantial absence... | 11/05/2002 |
| 6462151 | Method of removing and recovering boron trifluoride with metal fluoride and process for polyolefin production using the same Boron trifluoride can be recovered in a reusable state by a method that is economical and does not cause environmental pollution, which method comprises the steps of bringing a fluid containing boron trifluoride or its complex into contact with metal fluo... | 10/08/2002 |
| 6437062 | Gas phase olefin polymerization process A process for the polymerization of olefins in a gas phase reactor operating in a non-condensed mode, in which the process is carried out in the presence of a catalyst system containing (a) a metallocene supported on a solid support and (b) an activator, ... | 08/20/2002 |
| 6407186 | Method for producing low-molecular, highly reactive polyisobutylene A process for preparing low molecular weight, highly reactive polyisobutylene having an average molecular weight Mn of from 500 to 5000 Dalton and a terminal double bond content of more than 80 mol % by polymerization in the liquid phase of iso... | 06/18/2002 |
| 6407185 | Process for the preparation of a composition containing ethylene polymers, composition containing ethylene polymers and use thereof Process for the preparation of a composition containing ethylene polymers comprising a polymer of melt index MI2 of 5 to 1000 g/10 min and a polymer of melt index MI5 of 0.01 to 2 g/10 min, the ratio of these indices being from 500 t... | 06/18/2002 |
| 6355742 | Method of recycling cocatalyst for olefin polymerization conducted with metallocene catalyst A method of recycling a cocatalyst for olefin polymerization conducted with a metallocene catalyst is provided. In the method, olefinic monomers are polymerized using a supported catalyst and cocatalyst. The supported catalyst is prepared by covalent bond... | 03/12/2002 |
| 6340728 | Method for olefin polymerization with recycling of co-catalyst Disclosed are catalyst preparation olefin polymerization processes with the recycling of a co-catalyst. According to the olefin polymerization process activated single-site catalysts are prepared by contacting supported single-site pre-catalyst with an or... | 01/22/2002 |
| 6326455 | Methods for treating cobalt catalyst in oxidation mixtures resulting from oxidation of hydrocarbons to dibasic acids This invention relates to methods and reactor devices for controlling the oxidation of hydrocarbons to dibasic acids, in the presence of a cobalt catalyst and a monobasic acid, such as acetic acid, by treating the catalyst from the reaction mixture, outsi... | 12/04/2001 |
| 6326442 | Multistage method for manufacturing polyolefins The present invention provides a method for substantially continuously polymerizing olefins comprising: introducing into a first reaction zone a fresh olefin polymerization catalyst; contacting said fresh olefin polymerization catalyst in said first react... | 12/04/2001 |
| 6300633 | In-line method for determining the residue content of an isocyanate and apparatus useful therefor An in-line spectrometric method for determining the distillation residue content in an opaque, dark-colored mixture containing an isocyanate and tar-like materials (residue) during the isocyanate production process. A probe capable of directing light at w... | 10/09/2001 |
| 6300431 | Phase transfer process with catalyst recovery A process for catalytic recovery in a phase transfer process wherein heterogeneous reactions in a liquid-liquid two phase reaction systems using a phase transfer catalyst is improved by separating the two liquid phases with a membrane which retains the ca... | 10/09/2001 |
| 6265501 | Treatment of metathesis catalysts for olefins in a vibratory helicoidal conveyor A process for treatment of metathesis catalysts for olefins comprises sending the particles of catalysts through at least one vibratory helicoidal conveyor, subject the particles over at least a portion of their path and preferably over a large portion of... | 07/24/2001 |
| 6252017 | Production of polyethylene having improved crack and/or impact resistance A process for producing polyethylene having improved crack resistance, the process comprising copolymerizing ethylene and an alpha-olefinic comonomer comprising from 3 to 8 carbon atoms, in the presence of a chromium-based catalyst in a first reactor, fee... | 06/26/2001 |
| 6225422 | Gas fluidized bed polymerization process for olefins A process for the continuous gas fluidised bed polymerisation of olefins, especially ethylene, propylene, or mixtures of these with other alpha olefins, wherein the monomer containing recycle gas employed to fluidise the bed is passed through a separator.... | 05/01/2001 |
