N-hexene Patents (Class 526/348.5)
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Publication number: 20030181605Abstract: A process for producing a polyolefin according to the present invention comprises (co) polymerizing one or two or more &agr;-olefins in a vapor phase in a fluidized-bed reactor, wherein the concentration of (A) a saturated aliphatic hydrocarbon in the fluidized bed reactor is 1 mol % or more and at least one compound selected from (B) an aliphatic amide and (C) a nonionic surfactant constituted only of carbon, oxygen and hydrogen atoms is made to exist in the reactor. The present invention can provide a process for producing a polyolefin, the process ensuring that the prevention of clogging caused by the generation of sheet or block polymers and a high efficiency of the production of a polyolefin due to good catalytic activity can be accomplished at the same time and also having superb continuous productivity.Type: ApplicationFiled: March 25, 2003Publication date: September 25, 2003Inventors: Shinji Abe, Shotaro Matsuda, Satoru Ohtani, Hiroto Nishida, Michiharu Sakata, Tomohiro Arase
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Patent number: 6620866Abstract: The vulcanizates produced using the rubber mixtures according to the invention, in which the vulcanizates contain agglomerated rubber gels, are distinguished by improved mechanical properties with an at least equivalent damping behavior.Type: GrantFiled: August 16, 2000Date of Patent: September 16, 2003Assignee: Bayer AktiengesellschaftInventors: Werner Obrecht, Winfried Jeske
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Publication number: 20030171511Abstract: This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer, wherein said catalyst composition comprises a post-contacted organometal compound, a post-contacted organoaluminum compound, and a post-contacted treated solid oxide compound.Type: ApplicationFiled: March 17, 2003Publication date: September 11, 2003Inventors: Max P. McDaniel, Kathy S. Collins, Gil R. Hawley, Michael D. Jensen, Elizabeth A. Benham, Anthony P. Eaton, Joel L. Martin, Christopher E. Wittner
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Publication number: 20030171524Abstract: A hollow plastic article is described, with at least one opening and with a structure which has one or more layers, the hollow plastic article comprising at least one layer made from a polyolefin which was prepared using a fluorine-modified chromium catalyst. The use of hollow plastic articles of the invention as plastic fuel containers, gasoline canisters, plastic tanks, or plastic bottles or the like is also described.Type: ApplicationFiled: May 9, 2003Publication date: September 11, 2003Inventors: Shahram Mihan, Wolfganf Rohde, lIka Beuermann, Bernhard Springholz
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Patent number: 6617404Abstract: A process for preparing pillared chromium phyllosilicate clay &agr;-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 dissolving a chromium salt and a base in water, heating said first solution to a temperature in the range of about 20° C. to about 100° C. while stirring continuously until the solution reaches a pH in the range of about 1.5 to about 2.5 and thereby producing a master batch; (b) diluting said master batch with water to produce a diluted second solution and heating said diluted second solution to produce a heated second solution; (c) adding a solid clay selected from the group consisting of sepiolites and palagorskites to said heated second solution, and continuing heating; (d) recovering said pillared chain silicate clay; and (e) drying said pillared chain silicate clay to form first product.Type: GrantFiled: February 28, 2002Date of Patent: September 9, 2003Assignee: Phillips Petroleum CompanyInventor: Joseph S. Shveima
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Publication number: 20030166806Abstract: A single-site olefin polymerization catalyst is described. The catalyst comprises an activator and an inorganic compound comprising iron and a tridentate N-(2-ethylamino)-2-pyridylmethanimino or N,N-bis(2-pyridylmethyl)amino ligand. The late transition metal catalyst is active in olefin polymerization.Type: ApplicationFiled: March 4, 2002Publication date: September 4, 2003Inventors: Sandor Nagy, Karen L. Neal-Hawkins
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Publication number: 20030166809Abstract: A process for preparing a butyl polymer having a broad molecular weight distribution. The process comprises the step of contacting a C4 to C8 monoolefin monomers with a C4 to C14 multiolefin monomer at a temperature in the range of from about −100° C. to about +50° C. in the presence of a diluent and a catalyst mixture comprising a major amount of a dialkylalumium halide, a minor amount of a monoalkylaluminum dihalide, and a minute amount of an aluminoxane.Type: ApplicationFiled: February 26, 2003Publication date: September 4, 2003Inventor: Adam Gronowski
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Publication number: 20030162920Abstract: The present invention relates to a process for the copolymerisation of conjugated diolefins with non-conjugated olefins in the presence of rare earth metal catalysts. The advantages of the process according to the invention are in particular the high selectivity, good space-time yield and the possibility of being able to vary the reaction conditions within a wide range.Type: ApplicationFiled: April 21, 2003Publication date: August 28, 2003Inventors: Heike Windisch, Gerd Sylvester, Rudolf Taube, Steffen Maiwald, Jurgen Giesemann, Thomas Rosenstock
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Patent number: 6610797Abstract: In a process for preparing ethylene-vinyl acetate copolymers in which a mixture of ethylene and vinyl acetate is polymerized continuously in the presence of free-radical polymerization initiators and, if desired, molecular weight regulators in a cooled tube reactor at a pressure in the range from 1000 to 3500 bar, and the poly-merization initiator is added at the beginning and at two or more points along the tube reactor, and temperature changes in the reaction mixture along the tube reactor, between the first temperature maximum and the last addition of the polymerization initiator, are within a range of not more than 20° C.Type: GrantFiled: June 5, 2000Date of Patent: August 26, 2003Assignee: BASF AktiengesellschaftInventors: Andreas Deckers, Bernd Wenderoth, Peter Wedel, Wilhelm Weber
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Publication number: 20030158354Abstract: The present invention relates to a process for preparing high density polyethylene in the gas phase comprising contacting ethylene or a mixture comprising ethylene and one or more alpha-olefins with a chromium oxide catalyst supported on a granular or microspherical refractory oxide in a fluidised bed reactor in the presence of oxigen. The present invention further relates to a process for controlling the density of high density polyethylene prepared in the gas phase comprising contacting ethylene or a mixture comprising ethylene and one or more alpha-olefins with a chromium oxide catalyst supported on a granular or microspherical refractory oxide in a fluidised bed reactor in the presence of oxigen.Type: ApplicationFiled: March 21, 2003Publication date: August 21, 2003Inventor: Jean-Jacques Kuhlburger
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Publication number: 20030153695Abstract: A process for polymerizing monomers in the gas phase, in fluidized bed reactors is described, where unsaturated, gas phase monomers are fed into the reactors in the presence of a mixture of inert diluents having a composition that allows the dew point to be adjusted, this leading to high production rates under stable operation in a non condensed operation mode.Type: ApplicationFiled: September 10, 2002Publication date: August 14, 2003Inventors: Antonio Luiz Duarte Braganca, Antonio Luiz Ribeirio de Castro Morschbacker, Enio Rubbo, Cid Neto Miro, Tamara Barlem, Arj Mukherjee
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Patent number: 6605676Abstract: The process is characterized by the use of catalyst systems consisting of a single metallocene catalyst activated with mixtures of at least 2 co-catalysts. The co-catalysts are aluminium alkyls, aluminoxanes or boron compounds. Different active centers are produced in the catalyst through the use of these mixed co-catalyst systems, each having different rates of initiation and completion of the polymerization reaction, which give rise to polyolefins with different molecular weights, resulting in products with broad bimodal or multimodal molecular weight distributions and the incorporation of co-monomer can be controlled by appropriate selection of the metallocene and use of combinations of different types of co-catalysts, as well as by varying the reactor pressure, the reaction temperature and the molar ratios between the various components of the catalyst system.Type: GrantFiled: December 28, 1995Date of Patent: August 12, 2003Assignee: Repsol Quimica, S.A.Inventors: Wilfried Michiels Vega, Antonio Munoz-Escalona
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Publication number: 20030144441Abstract: A copper-mediated process for the synthesis of random copolymers of methyl acrylate with non-polarolefins, ranging from ethene to 1-octene, norbornene and norbornene derivatives, and capable of synthesizing copolymers having greater than 5% incorporation of the olefin, as well as copolymers synthesized using the process are described. The process displays many of the characteristics of a living polymerization process: the polydispersities of the copolymers obtained are less than about 1.7, preferably from about 1.1 to about 1.4, and it is possible to synthesize novel block terpolymers of methyl acrylate with olefins by the sequential addition of the latter monomers.Type: ApplicationFiled: November 12, 2002Publication date: July 31, 2003Inventors: Ayusman Sen, Sharon Elyashiv-Barad, Shengsheng Liu
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Publication number: 20030139284Abstract: A catalyst composition for preparing olefin polymers. The catalyst composition includes a metallocene compound and an activating cocatalyst. In the metallocene compound, two cyclopentadienyl groups are bridged by X (carbon, silicon, germanium or tin) in a ring structure. The bite angle &thgr; formed by the two cyclopentadienyl rings and X is equal to or greater than 100 degrees. The obtained olefin polymer has high cycloolefin conversion and a high glass transition temperature. In addition, the catalyst composition can still maintain relatively high activity at high temperature reaction conditions.Type: ApplicationFiled: September 17, 2002Publication date: July 24, 2003Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Jing-Cherng Tsai, Ming-Yuan Wu, Tung-Ying Hsieh, Yuh-Yuan Wei, Chao-Ying Yu
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Patent number: 6596822Abstract: The invention relates to a method and an apparatus for the polymerization of gaseous olefins, in particular of ethylene and at least one &agr;-olefin, in the gas phase in a stirred or fluidized, catalyst-containing polymerization zone (2) and at least one decompression zone (6, 10) downstream of the polymerization zone (2). The mixture of solid (co)polymer and unreacted monomers leaving the polymerization zone (2) flows through a settling zone, in particular in the form of a settling leg (14), before the decompression zone.Type: GrantFiled: April 2, 2002Date of Patent: July 22, 2003Assignee: Basell Polyolefine GmbHInventors: Michael Witt, Andreas Deckers, Farid Rizk, Kaspar Evertz
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Patent number: 6593438Abstract: This invention relates to a composition of matter comprising the catalyst compound comprising a transition metal complexed with a facially coordinating tridentate bisamide ligand. The invention is also directed to a catalyst system or a supported catalyst system comprising this compound and an activator and to a process for using the catalyst system or supported catalyst system in a process for polymerizing olefin(s).Type: GrantFiled: December 4, 2000Date of Patent: July 15, 2003Assignee: Univation Technologies, LLCInventor: John H. Oskam
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Publication number: 20030125486Abstract: A polyethylene having improved rheological properties is disclosed. The polyethylene has a melt index (MI2) from about 0.01 dg/min to about 50 dg/min and a melt strength (&eegr;) that satisfies MI2×&eegr;≧3.5. A process for making the polyethylene is also disclosed. The process uses an azaborolinyl-containing single-site catalyst in the presence of hydrogen, where the hydrogen consumption is controlled to be less than 30%.Type: ApplicationFiled: December 28, 2001Publication date: July 3, 2003Inventors: Mark K. Reinking, Harilaos Mavridis
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Patent number: 6586543Abstract: The present invention provides a process for preparing a substantially amorphous poly-&agr;-olefin, which includes: a) preforming a solid catalyst and, optionally, a first amount of a trialkylaluminum cocatalyst, by contacting the catalyst and optionally the cocatalyst with at least one selected from the group including oxygen and a compound which includes active oxygen, to form a preformed catalyst, wherein the solid catalyst includes magnesium, aluminum and titanium, and wherein said trialkylaluminum cocatalyst includes 1 to 9 carbon atoms in each alkyl group; b) contacting the preformed catalyst with a second amount of the cocatalyst, wherein a molar ratio of trialkylaluminum to the titanium ranges from 40:1 to 700:1, to form a catalyst mixture; c) polymerizing, in the liquid phase, with the catalyst mixture, an olefin or an olefin mixture at a temperature between 30 and 160° C., to produce the poly-&agr;-olefin.Type: GrantFiled: September 1, 2000Date of Patent: July 1, 2003Assignee: Degussa AGInventors: Hans Guenther Wey, Norbert Schlueter
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Patent number: 6586540Abstract: The invention relates to a method for the production of copolymer based on ethylene by continuous copolymerization of ethylene and comonomer in a reactor in the presence of a catalyst. In this method, in a first step of the copolymerization, a mixture comprising ethylene and comonomer of such a composition that a copolymer-containing coating deposits in the reactor is metered into the reactor and/or generated in the reactor, and, in a second step, the concentration of the comonomer in the metered-in mixture and/or in the mixture generated in the reactor is reduced sufficiently and/or the concentration of the ethylene in the metered-in mixture and/or in the mixture generated in the reactor is increased sufficiently that the coating is removed from the reactor either partially or completely. The method has the advantage that the production of copolymer does not have to be interrupted during cleaning of the reactor.Type: GrantFiled: July 19, 2001Date of Patent: July 1, 2003Assignee: Basell Polyolefine GmbHInventors: Paulus De Lange, Volker Billert, Bernd Brunner, Werner Ritter, Andreas Deckers
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Patent number: 6586538Abstract: A novel process for producing homopolymers and interpolymers of olefins which involves contacting an olefin and/or an olefin and at least one or more other olefin(s) under polymerization conditions with a metallocene catalyst and dinitrogen monoxide in amounts sufficient to reduce the electrostatic charge in the polymerization medium. Also provided is a process for reducing electrostatic charge in the production of polyolefins by introducing dinitrogen monoxide into the polymerization medium.Type: GrantFiled: May 15, 2001Date of Patent: July 1, 2003Assignee: Eastman Chemical CompanyInventors: Randal Ray Ford, Jeffrey James Vanderbilt, Roxanna Lea Whitfield, Glenn Edward Moore
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Patent number: 6586537Abstract: Process for manufacturing an olefin polymer composition in at least two polymerization reactors connected in series, in which the suspension of polymer in a diluant, formed in the first reactor, is sent into a hydrocyclone seperator in which, on the one hand, a stream comprising diluant and, on the other hand, a concentrated suspension of polymer particles are formed and separated. The concentrated suspension is then introduced into the subsequent polymerization reactor.Type: GrantFiled: January 4, 2001Date of Patent: July 1, 2003Assignee: Solvay Polyolefins Europe-Belgium (Societe Anonyme)Inventors: Daniel Marissal, Brent Walworth
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Patent number: 6583240Abstract: An ethylene polymerization process is disclosed. The polyethylene has a long-chain-branching index (LCBI) of 1 or greaster. The process uses a single-site catalyst that contains a boraaryl ligand. The catalyst is alkylated with triisobutyl aluminum.Type: GrantFiled: May 23, 2001Date of Patent: June 24, 2003Assignee: Equistar Chemicals, LPInventors: Shaotian Wang, Jean A. Merrick-Mack
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Publication number: 20030105252Abstract: A solid particulate metallocene-containing catalyst system is produced by combining an alkenyl substituted indenyl (t-butylamido)dimethyl silane titanium dichloride half sandwich metallocene in which the alkenyl substituent on the indenyl has terminal olefinic unsaturation and 5 to 6 carbon atoms with a suitable cocatalyst in a liquid and conducting prepolymerization of at least one olefin, optionally in multiple steps, to produce a prepolymerized solid catalyst, and separating the resulting solid from the liquid and the components dissolved in the liquid, said solid being the inventive solid particulate metallocene catalyst system. The use of the solid particulate catalyst in the polymerization of olefins is also disclosed.Type: ApplicationFiled: October 31, 2001Publication date: June 5, 2003Inventors: Alexander Reb, Helmut G. Alt, M. Bruce Welch
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Publication number: 20030105254Abstract: Catalyst precursor compounds having both (i) a polydentate ligand which comprises a cyclic moiety as well as a heteroatom and (ii) a protected hydride/hydrocarbyl ligand bonded to a metal atom, as well as olefin polymerization catalyst systems based thereupon, polymerization processes using such catalyst systems and polymers produced thereby.Type: ApplicationFiled: October 12, 2001Publication date: June 5, 2003Inventor: Thomas H. Peterson
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Patent number: 6573347Abstract: The present invention relates to a polymerizable composition comprising a) at least one ethylenically unsaturated monomer and b1) at least one multifunctional triazinyl based 2,2,6,6 tetramethylpiperidine-1-oxyl and a free radical initiator or b2) at least one multifunctional triazinyl based 2,2,6,6 tetramethylpiperidine-1-oxyl-ether. Further aspects of the present invention are a process for polymerizing ethylenically unsaturated monomers, the (co)polymers obtainable by this process and the use of multifunctional triazinyl based 2,2,6,6 tetramethylpiperidine-1-oxyls in combination with a free radical initiator, or a multifunctional triazinyl based 2,2,6,6 tetramethylpiperidine-1-oxyl-ethers for controlled polymerization. In a particularly preferred embodiment at least one additional heating step at a temperature from 140 to 280° C. is applied after polymerization is completed.Type: GrantFiled: December 15, 1999Date of Patent: June 3, 2003Assignee: Ciba Specialty Chemicals CorporationInventors: Wiebke Wunderlich, Rudolf Pfaendner, Raymond Seltzer, James Peter Galbo
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Patent number: 6573352Abstract: Long-chain, branched, propylene-based polymers, of which the melt index and the molecular weight distribution and the melt tension and the limiting viscosity both satisfy specific requirements, have good physical properties that are comparable to or better than those of conventional propylene-based polymers. They have good melt workability and are favorable to large-size blow molding and extrusion foaming. They are favorably used as miscibility improvers for propylene homopolymers and propylene-based copolymers.Type: GrantFiled: December 3, 1999Date of Patent: June 3, 2003Assignee: Idemitsu Petrochemical Co., Ltd.Inventors: Tomio Tatsumi, Shuji Machida, Mitsugu Kanzawa, Yutaka Minami, Yasuhiro Goto, Masato Kijima
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Patent number: 6569977Abstract: Reagents to cause swelling of coarsely ground vulcanized rubber, and a method of using the reagents is disclosed. Reagents which cause rubber to swell but which do not attack or react with rubber include various hydrocarbons, ketones and lactones. Specifically useful are benzene, cyclohexanone, cyclohexane, toluene, xylene, hexane, heptane, acetone, gasoline, paramethadione, ethyl acetate, methyl ethyl ketone and amyl acetate. It is taught that specific reagents work most effectively with specific types of rubbers, and that mixtures of reagents, preferably reagents having the same polarity, may be used. The reagent of the present invention is mixed with the coarsely ground rubber powder for about five minutes or more, causing the rubber particles to approximately double in size. Preferably, the reagent is substantially fully absorbed by the rubber. The swollen rubber is then suitable for further processing, namely, grinding into a superfine powder.Type: GrantFiled: April 4, 2000Date of Patent: May 27, 2003Inventor: Yangsheng Liu
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Publication number: 20030092563Abstract: A supported catalyst for olefin polymerization comprises a combination of a novel metal oxide support and an activator which is an aluminoxane or a boron activator. The novel metal oxide support of this invention is a conventional particulate metal oxide support material (such as silica or alumina) which has been treated with a halosulfonic acid. A catalyst system which contains this novel catalyst support and a transition metal catalyst is highly active for olefin polymerization (in comparison to prior art catalyst systems which use a conventional metal oxide support).Type: ApplicationFiled: February 7, 2002Publication date: May 15, 2003Applicant: NOVA Chemicals (International) S.A.Inventors: Xiaoliang Gao, P. Scott Chisholm, Matthew Gerald Kowalchuk, Robert D. Donaldson
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Publication number: 20030092858Abstract: Silica powders and mixed silica-oxide powders and methods of preparing such powders for use as catalyst supports for polymerization processes.Type: ApplicationFiled: February 27, 2002Publication date: May 15, 2003Inventors: Theresa A. Pecoraro, Ignatius Y. Chan, Darryl K. Whaley, Pamela R. Auburn
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Patent number: 6562924Abstract: A process for the gas-phase (co-)polymerization of olefins in a fluidized bed reactor using a metallocene catalyst in that the polymerization is preformed in the presence of a process aid additive selected from at least one of 1) a polysulfone copolymer, 2) a polymeric polyamine, or 3) an oil-soluble sulfonic acid.Type: GrantFiled: November 6, 2001Date of Patent: May 13, 2003Assignee: BP Chemicals LimitedInventors: Gacem Benazouzz, Michel Camoin, Laurent Coupier, Jean-Pierre Isnard, Frederic Robert Marie Michel Morterol, John Paul McNally, Renaud Viguier
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Patent number: 6562921Abstract: A catalyst precursor compound useful for the polymerization of olefins. The compound comprises a metal atom and two &pgr;-bonded aromatic ring systems which are bridged by being linked to adjacent members of a ring structure in cis fashion.Type: GrantFiled: October 12, 2001Date of Patent: May 13, 2003Assignee: Univation Technologies, LLCInventors: Timothy T. Wenzel, Robert D. Froese, Thomas Henry Peterson
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Patent number: 6562919Abstract: This application discloses triphenyl carbenium NCA's as catalyst activators for a class of asymmetrically bridged hafnocene catalyst precursors. These catalyst precursors are activated into olefin polymerization catalysts and are suitable for gas, solution, and slurry-phase polyermization reactions. The disclosed bridge is methylenyl- or silanylenyl-based and is optionally, alkyl or aryl substituted. The catalytic activity of the disclosed hafnocene catalyst precursors is substantially enhanced over identical catalysts that are activated with other activators.Type: GrantFiled: October 23, 2001Date of Patent: May 13, 2003Assignee: ExxonMobil Chemical Patents Inc.Inventors: Donna Jean Crowther, Bernard Jean Folie
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Publication number: 20030088037Abstract: A polymerization process comprises contacting one or more olefinic comonomers in the presence of at least a high molecular weight catalyst and at least a low molecular weight catalyst in a single reactor; and effectuating the polymerization of the olefinic comonomers in the reactor to obtain an olefin polymer. Preferably, both catalysts have the ability to incorporate a substantially similar amount of comonomers in the olefin polymer. The polymers produced by the process may have a relatively higher level of long chain branching while maintaining a relatively narrow molecular weight distribution, i.e., MWD less than about 6. These interpolymers may exhibit processability similar to or better than LDPE but have physical properties similar to metallocene catalyzed polymers.Type: ApplicationFiled: March 15, 2002Publication date: May 8, 2003Applicant: The Dow Chemical CompanyInventors: James C. Stevens, Daniel D. VanderLende
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Patent number: 6559251Abstract: A process for making ethylene copolymers is disclosed. Ethylene copolymerizes with an &agr;-olefin in the presence of a catalyst system comprising an activator and a silica-supported, bridged indenoindolyl metal complex having “open architecture.” The supported complex incorporates comonomers with exceptional efficiency, and the process gives ethylene copolymers having high molecular weights (Mw>100K) and very low densities (<0.910 g/cm3). Open architecture catalysts that include bridging through the indolyl nitrogen of the indenoindolyl framework are also described.Type: GrantFiled: August 2, 2002Date of Patent: May 6, 2003Assignee: Equistar Chemicals, LPInventors: Shaotian Wang, Clifford C. Lee, Mark P. Mack, Gregory G. Hlatky, Sandor Nagy, Barbara M. Tsuie
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Patent number: 6558760Abstract: The sealability of a thermoplastic, mono- or multi-layer film having an irradiated sealing layer comprising a polyethylene and/or an ethylene-x-olefin copolymer with a density ≧0.915 g/cm3 is improved by corona treating said sealing layer. The integrity of the obtained sealed container is maintained under pasteurizing or cook-in conditions.Type: GrantFiled: September 13, 1999Date of Patent: May 6, 2003Assignee: Cryovac, Inc.Inventors: Mario Paleari, Romano Spigaroli
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Patent number: 6555642Abstract: A copolymer of ethylene and an alpha-olefin contains from 3 to 12 carbon atoms, wherein 0.1 to 1.5 mol % of the units originate from the alpha-olefin. The copolymer has a relative density ranging from 0.960 to 0.940, a transition metal content lower than 6 ppm, an Mw/Mn ratio higher than 7, an Mz/Mw ratio higher than 3.3 and an Mz higher than 300,000. The copolymer is prepared from the polymerization or co-polymerization of at least one olefin in the presence of a solid catalytic component or a prepolymerized catalyst.Type: GrantFiled: February 6, 2002Date of Patent: April 29, 2003Assignee: Elf Atochem, S.A.Inventors: Jean Malinge, Claude Brun, Jean-Loup Lacombe
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Publication number: 20030078357Abstract: Elastic ethylene polymers are disclosed which have processability similar to highly branched low density polyethylene (LDPE), but the strength and toughness of linear low density polyethylene (LLDPE). The polymers have processing indices (PI's) less than or equal to 70 percent of those of a comparative linear ethylene polymer and a critical shear rate at onset of surface melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a traditional linear ethylene polymer at about the same I2 and Mw/Mn. The novel polymers can also have from about 0.01 to about 3 long chain branches/1000 total carbons and have higher low/zero shear viscosity and lower high shear viscosity than comparative linear ethylene polymers. The novel polymers can also be characterized as having a melt flow ratio, I10/I2,≧5.63, a molecular weight distribution, Mw/Mn, defined by the equation: Mw/Mn≦(I10/I2)−4.Type: ApplicationFiled: June 20, 2002Publication date: April 24, 2003Inventors: Shih-Yaw Lai, John R. Wilson, George W. Knight, James C. Stevens
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Patent number: 6552150Abstract: The present invention concerns a polyethylene composition particularly suitable for film blowing. The invention also concerns a process for the production thereof. The composition comprises a low molecular weight portion having a density of more than 960 kg/m3 and a high molecular weight portion. The polyethylene composition has a density of about 925-940 kg/m3 and a melt flow rate in the range of MFR21, from 5 to 40 g/10 min. A polyethylene film blown from the polyethylene composition exhibits a tensile strength at yield in transverse direction at least 15 MPa, a 1% secant modulus in machine direction at least 300 MPa and in transverse direction at least 400 MPa, and a dart drop of at least 5 g/&mgr;m.Type: GrantFiled: September 14, 2000Date of Patent: April 22, 2003Assignee: Borealis Technology OyInventors: Auli Nummila-Pakarinen, Ole Jan Myhre, Bjarne Jansen
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Patent number: 6552149Abstract: A process for producing terpolymers of propylene, comprising a) feeding into a slurry reactor a reaction mixture containing 50-85 w-% of propylene, 1-10 w-% of ethylene, 15-40 w-% of another C4-C8 alpha-olefin, a catalyst system maintaining olefin polymerization at said temperature conditions, and optionally hydrogen, b) polymerizing said reaction mixture at a temperature of lower than 70° C. a sufficient time to obtain a propylene terpolymer amounting to 50-99 w-% of the end product, c) transferring said reaction mixture into a gas phase reactor operating at a pressure of higher than 5 bars, preferably higher than 10 bars, optionally adding 0-30 w-% of ethylene, 0-10 w-% of another C4-C8 alpha-olefin, 0-40 w-% of propylene and optionally hydrogen, and d) continuing polymerization in said gas phase reactor for obtaining a propylene terpolymer amounting to 1-50 wt-% of the end product. The terpolymer has a melting temperature a less than 135° C., preferably less than 132° C.Type: GrantFiled: December 21, 2001Date of Patent: April 22, 2003Assignee: Borealis Technology OyInventors: Kauno Alastalo, Bo Malm, Päivi Pitkänen, Mika Meller, Anne Britt BjÃ¥land, Nina Ackermans, Kshama Motha
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Publication number: 20030073569Abstract: The present invention relates to a catalyst composition for homopolymerization or copolymerization of olefins comprising: (a) a solid catalyst precursor comprising a transition metal compound of group IVB, VB, or VIB of the periodic table, a magnesium compound and aliphatic polyketone particles; and (b) a cocatalyst comprising an aluminum alkyl, an aluminoxane or mixtures thereof; and a process for homopolymerisation or copolymerisation of olefins.Type: ApplicationFiled: August 30, 2002Publication date: April 17, 2003Inventors: John Ledford, Mansour I. Taftaf, Syriac Palackal, Atieh Abu Raqabah, Akhlaq A. Moman, Orass M. Hamed, Navin Nallaveerapan
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Patent number: 6541592Abstract: A thermoplastic elastomer composition comprising 5 to 95 wt % of the following (A) and 5 to 95 wt % of the following (B), wherein the flowability index I according to a test for flow properties with a capillary rheometer is 1.35 or more: (A) an ethylene-&agr;-olefin copolymer having a tensile stress M100 measured according to JIS-K-6251 of 2.5 MPa or less, (B) a polyolefin-based resin having a tensile stress M100 measured according to JIS-K-6251 of 2.5 MPa or more.Type: GrantFiled: August 9, 2000Date of Patent: April 1, 2003Assignee: Sumitomo Chemical Company, LimitedInventors: Katsunari Inagaki, Tadaaki Nishiyama
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Publication number: 20030060582Abstract: Silica powders and mixed silica-oxide powders and methods of preparing such powders for use as catalyst supports for polymerization processes.Type: ApplicationFiled: February 27, 2002Publication date: March 27, 2003Inventors: Theresa A. Percoraro, Ignatius Y. Chan, Darryl K. Whaley, Pamela R. Auburn
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Publication number: 20030055184Abstract: One or more oligomers of an olefin are prepared in the presence of a single-site catalyst. Preferably, the olefin is an &agr;-olefin, and the oligomers are a poly-alpha-olefin (PAO). The PAO so prepared is completely or substantially free of tertiary hydrogen resulting from isomerization. Consequently, the PAO possesses improved biodegradability, improved oxidation resistance, and/or a relatively higher viscosity index. The PAO has many useful applications, such as a component of a lubricant.Type: ApplicationFiled: August 29, 2002Publication date: March 20, 2003Applicant: Pennzoil-Quaker State CompanyInventors: Wei Song, William J. Heilman
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Patent number: 6534613Abstract: A novel process for producing homopolymers and copolymers of ethylene which involves contacting ethylene and/or ethylene and at least one or more other olefin(s) under polymerization conditions with a Ziegler-Natta type catalyst, at least one halogenated hydrocarbon, at least one compound of the formula XnER3-n as a co-catalyst and at least one compound containing at least one carbon-oxygen-carbon linkage (C—O—C) of the formula R1—O(—R2—O)n—R3 as an external electron donor. Also provided are films and articles produced therefrom.Type: GrantFiled: July 24, 2001Date of Patent: March 18, 2003Assignee: Eastman Chemical CompanyInventors: Randal Ray Ford, William Albert Ames, Kenneth Alan Dooley, Jeffrey James Vanderbilt, Alan George Wonders
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Patent number: 6534612Abstract: Elastic ethylene polymers are disclosed which have processability similar to highly branched low density polyethylene (LDPE), but the strength and toughness of linear low density polyethylene (LDPE). The polymers have processing indices (PI's) less than or equal to 70 percent of those of a comparative linear ethylene polymer and a critical shear rate at onset of surface melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a traditional linear ethylene polymer at about the same I2and Mw/Mn. The novel polymers can also have from about 0.01 to about 3 long chain branches/1000 total carbons and have higher low/zero shear viscosity and lower high shear viscosity than comparative linear ethylene polymers. The novel polymers can also be characterized as having a melt flow ratio, I10/I2, ≧5.63, a molecular weight distribution, Mw/Mn, defined by the equation: Mw/Mn≦(I10/I2)−4.Type: GrantFiled: November 15, 1999Date of Patent: March 18, 2003Assignee: The Dow Chemical CompanyInventors: Shih-Yaw Lai, John R. Wilson, George W. Knight, James C. Stevens
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Patent number: 6534604Abstract: Catalyst compositions and methods, useful in polymerization processes, utilizing at least two metal compounds are disclosed. At least one of the metal compounds is a Group 15 containing metal compound and the other metal compound is preferably a bulky ligand metallocene-type catalyst. The invention also discloses a new polyolefin, generally polyethylene, particularly a multimodal polymer and more specifically, a bimodal polymer, and its use in various end-use applications such as film, molding and pipe.Type: GrantFiled: May 24, 2001Date of Patent: March 18, 2003Assignee: Univation Technologies, LLCInventors: Donald R. Loveday, David H. McConville, John F. Szul, Kersten Anne Erickson, Simon Mawson, Tae Hoon Kwack, Frederick J. Karol, David James Schreck
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Publication number: 20030050411Abstract: A polymerization process comprises (1) contacting at least one polymerizable monomer in the presence of a metal catalyst in a reactor; (2) effectuating polymerization of the monomer; (3) adding a substituted olefin having at least one polar group to the reactor. The substituted olefin is different from the monomer. Vinyl-terminated macromers preferably are generated which can be homopolymerized or copolymerized with the monomer by the metal catalyst. A polymer of an olefin monomer and a substituted olefin comprising a backbone and a plurality of side chains. The polymer is characterized by an Rv of greater than about 0.85, where Rv is a measure of the relative number of vinyl groups in the polymer. In some polymers, the vinyl endgroups are transformed to other useful end groups.Type: ApplicationFiled: June 11, 2002Publication date: March 13, 2003Applicant: Dow Global Technologies Inc.Inventors: Scott Gaynor, Michael Mullins, Phillip Athey, Harold Boone
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Publication number: 20030040427Abstract: Catalyst components for the preparation of ethylene (co)polymers capable to produce polymers with high bulk density, to avoid the problems of formation of fines and that have a high activity are provided. Said catalyst components are characterized by comprising a non-stereospecific solid catalyst component, comprising a titanium compound and a magnesium dihalide, which is pre-polymerized with an alpha olefin CH2═CHR1 wherein R is a C1-C8 alkyl group, to such an extent that the amount of the &agr;-olefin pre-polymer is up to 100 g per g of said solid catalyst component.Type: ApplicationFiled: January 8, 2002Publication date: February 27, 2003Inventors: Mario Sacchetti, Diego Brita, Gianni Collina
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Publication number: 20030040588Abstract: A high molecular weight, medium density polyethylene (HMW, MDPE) is disclosed. The polyethylene comprises from about 85 to about 98 wt % of recurring units of ethylene and about 2 to about 15 wt % of a C3-C10 &agr;-olefin. It has a density from about 0.92 to about 0.944 g/cc, a melt index MI2 from about 0.01 to about 0.5 dg/min, and a melt flow ratio MFR from about 50 to about 300. It has a multimodal molecular weight distribution comprising a high molecular weight component and a low molecular weight component. The low molecular weight component has an MI2 from about 50 to about 600 dg/min and a density from about 0.94 to about 0.97 g/cc. A process for making the medium density polyethylene is also disclosed. The process uses a Ziegler catalyst and applies multiple reaction zones.Type: ApplicationFiled: September 12, 2002Publication date: February 27, 2003Applicant: Equistar Chemicals, LPInventors: Philip J. Garrison, Lawrence R. Wallace, Danny L. Wise, James H. Meas, Leonard V. Cribbs, Jean A. Merrick-Mack, Paula L. Nygard
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Patent number: 6525149Abstract: A novel liquid phase polymerization process for preparing a polyolefin product having preselected properties is disclosed. The process includes the steps of providing a liquid feedstock which contains an olefinic component and a catalyst composition consisting of a stable complex of BF3 and a complexing agent therefor. The feedstock may comprise any one or more of a number of olefins including branched olefins such as isobutylene, C3 to C15 linear alpha olefins and C4 to C15 reactive non-alpha olefins. The feedstock and the catalyst composition are introduced into a residual reaction mixture recirculating in a loop reactor reaction zone provided in the tube side of a shell and tube heat exchanger at a recirculation rate sufficient to cause intimate intermixing of the residual reaction mixture, the added feedstock and the added catalyst composition.Type: GrantFiled: September 20, 2000Date of Patent: February 25, 2003Assignee: Texas Petrochemicals, LPInventors: C. Edward Baxter, Jr., Gilbert Valdez, Christopher Lobue, Timothy Lowry, Armen Abazajian