N-hexene Patents (Class 526/348.5)
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Hetero cyclic metallocene compounds and use thereof in catalyst system for producing olefin polymers
Publication number: 20030036612Abstract: 1 A metallocene compound of general formula (I): LGZMXp, wherein L is a divalent group, Z is a moiety of formula (II), wherein R3 and R4 are selected from hydrogen and hydrocarbon groups; A and B are selected from S, O or CR5, wherein R5 is selected from hydrogen and hydrocarbon groups, either A or B being different from CR5; G is a moiety of formula (III), wherein R6, R7, R8 and R9 are selected from hydrogen and hydrocarbon groups, M is an atom of a transition metal, X is selected from a halogen atom, a R10, OR10, OSO2CF3, OCOR10, SR10, NR102 or PR102 group, wherein the substituents R10 is hydrogen and a hydrocarbon group; p is an integer from 0 to 3.Type: ApplicationFiled: August 27, 2001Publication date: February 20, 2003Inventors: Ilya E. Nifant'ev, Simona Guidotti, Luigi Resconi, Ilya P. Laishevtsev -
Publication number: 20030032740Abstract: 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: ApplicationFiled: July 30, 2002Publication date: February 13, 2003Applicant: Texas Petrochemicals LPInventors: C. Edward Baxter, Gilbert Valdez, Christopher Lobue, Timothy Lowry, Armen Abazajiah
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Patent number: 6518372Abstract: In a process for the gas-phase polymerization of &agr;-olefins at from 20 to 130° C. and pressures of from 1 to 100 bar, the polymerization is carried out in a tubular reactor having a length:diameter ratio of >100 and the growing polymer particles pass through the tubular reactor in its longitudinal direction without a significant part of the polymer particle stream being circulated.Type: GrantFiled: January 24, 2002Date of Patent: February 11, 2003Assignee: Basell Polyolefine GmbHInventor: Günter Weickert
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Patent number: 6518385Abstract: Ethylene homopolymers and copolymers having a broad molecular distribution, excellent toughness and improved processability. These polymers may be prepared by use of a single metallocene catalyst system in a single reactor in the gas phase. These polymers of density typically 0.85-0.95 are defined in particular by their melt strength (MS) and long chain branching (LCB) characteristics and are particularly suitable for use in low density film applications.Type: GrantFiled: July 6, 2000Date of Patent: February 11, 2003Assignee: BP Chemicals LimitedInventor: Choon Kooi Chai
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Publication number: 20030027958Abstract: The present invention relates to nitrile rubber polymers having lower molecular weights and narrower molecular weight distributions than those known in the art. The present invention also relates to a process for the manufacture of said nitrile rubber and the use of said nitrile rubber for the manufacture of shaped articles.Type: ApplicationFiled: June 10, 2002Publication date: February 6, 2003Inventors: Frederic Guerin, Sharon X. Guo
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Publication number: 20030018142Abstract: A process for preventing polymeragglomeration and for controlling the density of copolymer produced by an alpha-olefin copolymerization process in a polymerization reactor, wherein the ratio of the flow rates of introduction of the comonomer(s) to the monomer is kept constant.Type: ApplicationFiled: April 26, 2002Publication date: January 23, 2003Inventor: Frederic Robert Marie Michel Morterol
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Publication number: 20030018141Abstract: A process for the polymerisation and copolymerisation of olefins is disclosed, comprising contacting the monomeric olefin under polymerisation conditions with a polymerisation catalyst or catalyst system which comprises (a) a source of a Group VIII metal; (b) a bidentate phosphine ligand having the formula (R1)(R1)P—X—P(R1)(R1), where each R1 is independently selected from a phenyl group or a substitued phenyl group with the proviso that at least one of the R1 groups is a phenyl group having at least one ortho substituent, and X is a bridging group of the structure —[N]x—[P]9—[N]— where x and y are independently 0 or 1, or —C(R4)2—where R4 may be the same or different and is hydrogen or a monovavlent hydrocarbyl, substituted hydrocarbyl or hetero-hydrocarbyl group; and optionally (c) a promoter.Type: ApplicationFiled: February 5, 2002Publication date: January 23, 2003Inventor: Duncan Frank Wass
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Patent number: 6506867Abstract: 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: GrantFiled: October 18, 2000Date of Patent: January 14, 2003Assignee: The Dow Chemical CompanyInventors: Shih-Yaw Lai, John R. Wilson, George W. Knight, James C. Stevens
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Publication number: 20030008988Abstract: A polymer of ethylene as a first monomeric component, with a high carbon number linear alpha olefin having at least five carbon atoms as a second monomeric component. At least one of the monomeric components is Fischer-Tropsch derived so that it includes at least one other olefinic component. A process for producing the polymer is also provided.Type: ApplicationFiled: January 29, 2001Publication date: January 9, 2003Applicant: SASOL TECHNOLOGY (PROPRIETARY) LIMITEDInventors: Ioan Tincul, Dawid Johannes Joubert, Desmond Austin Young
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Publication number: 20020198341Abstract: The present invention provides an ethylene resin sealant for a laminated film, which is excellent in low-temperature heat-sealing properties, hot tack properties, impact resistance, tearability and extrusion properties. This ethylene resin sealant for a laminated film comprises an ethylene/&agr;-olefin copolymer having the following properties: the density is in the range of 0.880 to 0.920 g/cm3; the melt flow rate (MFR) at 190° C. under a load of 2.16 kg is in the range of 0.1 to 5.0 g/10 min; the decane-soluble component fraction (W) at room temperature and the density (d) satisfy the relation W<80×exp(−100(d−0.88))+0.1; the flow index (FI), which is defined as a shear rate at which the shear stress of said copolymer in a molten state at 190° C. reaches 2.4×106 dyne/cm2, and MFR satisfy the relation FI>75'MFR; and the melt tension (MT) at 190° C. and MFR satisfy the relation 5.5×MFR−0.65>MT>2.2×MFR−0.84.Type: ApplicationFiled: June 26, 2002Publication date: December 26, 2002Inventor: Mamoru Takahashi
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Patent number: 6492465Abstract: This invention relates to propylene impact copolymer compositions. In particular, these unique and improved compositions can be produced using conventional, commercial-scale processes.Type: GrantFiled: March 24, 2000Date of Patent: December 10, 2002Assignee: ExxonMobil Chemical Patents, Inc.Inventors: Terry John Burkhardt, Robert Tan Li, Aspy Keki Mehta, Udo M. Stehling, William T. Haygood, Jr., Francis C. Rix, Dawn C. Wiser
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Patent number: 6489413Abstract: The invention comprises an olefin polymerization process comprising contacting ethylene alone or with one or more olefinically unsaturated comonomers with a Group 3-6 metallocene catalyst compound comprising one &pgr;-bonded ring having a C3 or greater hydrocarbyl, hydrocarbylsilyl or hydrocarbylgermyl substituent said substituent bonded to the ring through a primary carbon atom; and, where the compound contains two &pgr;-bonded rings, the total number of substituents on the rings is equal to a number from 3 to 10, said rings being asymmetrically substituted where the number of substituents is 3 or 4. The invention process is particularly suitable for preparing ethylene copolymers having an MIR less than about 35, while retaining narrow CD even at high comonomer incorporation rates, and with certain embodiments providing ethylene copolymers having improved melt strength with the low MIR.Type: GrantFiled: July 13, 2000Date of Patent: December 3, 2002Assignee: ExxonMobil Chemical Patents Inc.Inventors: Joseph C. Floyd, Moses Olukayode Jejelowo, Donna Jean Crowther, George Alan Vaughan, Ching Tai Lue
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Patent number: 6489409Abstract: Process for manufacturing olefin polymers, in which some of the suspension of olefin polymer particles formed in a diluent is drawn off from the polymerization reactor and diluted by means of a liquid before being sent into a hydrocyclone separator in which, on the one hand, a concentrated suspension of polymer particles and, on the other hand, a stream essentially comprising diluent are formed and separated.Type: GrantFiled: January 4, 2001Date of Patent: December 3, 2002Assignee: Solvay Polyolefins Europe-Belgium (Societe Anonyme)Inventors: Daniel Marissal, Brent Walworth
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Patent number: 6489426Abstract: Propylene homopolymers or propylene-olefin copolymers, having at least one olefin selected from ethylene and &agr;-olefins having 4 or more carbon atoms where the propylene content in this copolymer is 98% by weight or more, are provided that are suitable for producing films with excellent antistatic performance, high rigidity and metallizability.Type: GrantFiled: August 23, 2000Date of Patent: December 3, 2002Assignee: Chisso CorporationInventors: Naoshi Kawamoto, Yasuhiro Shiraishi, Atsuko Sawai, Yuji Ando, Shinji Nakata, Hisanobu Minamizawa, Ichiro Sakabe, Katsuhiko Ohno
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Publication number: 20020177677Abstract: Ethylene polymer for cast film processing at about 210 to 350° C. having a slip velocity at metal wall of not less than about 30 mm/sec, wherein polymer is obtained by polymerization using a metallocene catalyst; a resin composition for cast film processing at about 210 to 350° C.Type: ApplicationFiled: March 29, 2002Publication date: November 28, 2002Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Kazunori Kanamori, Kenzo Chikanari, Tatsuhiro Nagamatsu
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Patent number: 6486273Abstract: A supported catalyst for the polymerization of olefins, especially ethylene, has at least two catalyst components having different propagation and/or termination constants. Each catalyst component must have at least one phosphinimine ligand. The polymer produced according to this invention has a broad molecular weight distribution. Catalysts according to this invention have a very surprising and desirable hydrogen response.Type: GrantFiled: April 16, 2001Date of Patent: November 26, 2002Assignee: Nova Chemicals (International) S.AInventors: Ian McKay, Alison Ciupa, Barbara Christine Hall
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Publication number: 20020173600Abstract: The present invention is directed to improved drag reducing agents and methods of forming improved drag reducing agents comprising the steps of isomerizing olefin monomers to form isomerized olefin monomers, polymerizing the isomerized olefin monomers in the presence of at least one catalyst to form a polyolefin drag reducing agent having unexpectedly superior drag reduction properties when combined with liquid hydrocarbons, such as viscous crude oil. Therefore, the drag reducing agents of the present invention may be introduced into conduits, such as pipelines, to increase the flow of the hydrocarbons through the conduit.Type: ApplicationFiled: January 15, 2002Publication date: November 21, 2002Inventors: Gerald B. Eaton, Michael J. Monahan, Alan K. Ebert, Robert J. Tipton, Eduardo Baralt
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Patent number: 6479599Abstract: This invention relates to a supported metallocene catalyst system for the high yield synthesis of polyolefins, to methods of preparation of the catalyst system, to polymerization processes which use the catalyst system and to polyolefin polymers produced by the polymerization processes.Type: GrantFiled: September 17, 1999Date of Patent: November 12, 2002Assignee: BP Chemicals LimitedInventors: Kevin P. Peil, David R. Wilson
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Patent number: 6476166Abstract: This invention is directed to a process for the preparation of polyolefins from one or more olefinic monomers comprising combining said olefins under olefin polymerization conditions with an organometallic catalyst compound that is activated for olefin polymerization by reaction with at least one Lewis acid aluminum compound of the formula RnAl(ArHal)3−n, where “ArHal” is a halogenated aryl group, n=1 or 2, and R is a monoanionic group other than a halogenated aryl group. The invention also relates to a polymer produced using the process and to the polymer itself.Type: GrantFiled: July 20, 2000Date of Patent: November 5, 2002Assignee: Univation Technologies, LLCInventors: Matthew W. Holtcamp, Ching-Tai Lue
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Publication number: 20020161141Abstract: The invention provides for polymerization catalyst compositions, and for methods for introducing the catalyst compositions into a polymerization reactor. More particularly, the method combines a catalyst component containing slurry and a catalyst component containing solution to form the completed catalyst composition for introduction into the polymerization reactor. The invention is also directed to methods of preparing the catalyst component slurry, the catalyst component solution and the catalyst compositions, to methods of controlling the properties of polymer products utilizing the catalyst compositions, and to polymers produced therefrom.Type: ApplicationFiled: November 27, 2001Publication date: October 31, 2002Inventors: Simon Mawson, Sun-Chueh Kao, Tae Hoon Kwalk, Timothy Roger Lynn, David H. McConville, Matthew Gary McKee, John Francis Szul, Kersten Anne Terry, Timothy T. Wenzel, Mark Gregory Goode, John Henry Oskam, Robert J. Jorgensen, Robert Harold Vogel
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Publication number: 20020161144Abstract: An ethylene polymerization process is disclosed. The process uses a single-site catalyst that contains a boraaryl ligand. It comprises supporting the catalyst, forming a slurry of the supported catalyst in an organic solvent, mixing the catalyst slurry with trialkyl aluminum compound, and polymerizing ethylene in the presence of the trialkyl aluminum-treated catalyst slurry. The process gives polyethylene having a controlled long-chain-branch index.Type: ApplicationFiled: March 29, 2001Publication date: October 31, 2002Inventors: Shaotian Wang, Jean A. Merrick-Mack
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Publication number: 20020161143Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.Type: ApplicationFiled: January 31, 2002Publication date: October 31, 2002Inventors: Terry J. Burkhardt, Udo M. Stehling, James R. Hart, William T. Haygood, Robert T. Li, James C. Vizzini, Matthew C. Kuchta
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Patent number: 6472484Abstract: The present invention provides a method for producing a polyolefin composition having a narrow composition distribution and is characterized in that when at least two olefins are copolymerized in the presence of a transition metal compound catalyst using at least two gas phase fluidized bed reactors, a saturated aliphatic hydrocarbon is allowed to exist in each reactor in a concentration from 0.1 to 30 mol %, and the ratio of the concentration (C2) of a saturated aliphatic hydrocarbon in a reactor of a second stage to the concentration (C1) of a saturated aliphatic hydrocarbon in a reactor of a first stage (C2/C1) is 0.13 or more.Type: GrantFiled: September 26, 2001Date of Patent: October 29, 2002Assignee: Mitsui Chemicals, Inc.Inventors: Shinji Abe, Tomohiro Arase, Satoru Ohtani, Shotaro Matsuda
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Patent number: 6472482Abstract: Polyolefins, preferably polyethylene, are prepared in a continuous gas-phase polymerization process in which the fluid monomeric component, preferably ethylene, and, optionally, one or more comonomers is/are polymerized in the polymerization zone of a fluidized-bed reactor in the presence of one or more catalysts, optionally with the addition of various auxiliaries, under reaction conditions where the fluidizing gas is circulated to remove the heat of polymerization or reaction and the polymerization product is taken from the circuit and the corresponding amount of monomer and, optionally, comonomers and optionally further auxiliaries are fed in, wherein the fluidizing gas discharged from the fluidized-bed reactor is cooled by means of a direct cooling apparatus in which the coolant is brought into direct contact with the fluidizing gas and heated coolant is passed to at least one further cooling stage in order to cool it and is, after cooling, wholly or partly returned to the direct cooling apparatus and/orType: GrantFiled: April 4, 2001Date of Patent: October 29, 2002Assignee: Basell Polyolefine GmbHInventors: Kaspar Evertz, Manfred Sandkühler, Walter Schicketanz
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Publication number: 20020156209Abstract: Ethylene based copolymers having high molecular weights, narrow molecular weight distributions, and a very good homogeneous distribution of the comonomer units can be obtained in high yields at temperatures of industrial interest, by carrying out the polymerization reaction in the presence of metallocene catalysts comprising particular bridged bis-indenyl compounds substituted in the 3-position on the indenyl groups.Type: ApplicationFiled: December 17, 1999Publication date: October 24, 2002Inventors: TIZIANO DALL'OCCO, LUIGI RESCONI
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Publication number: 20020156214Abstract: Provided is a high density multimodal polyethylene, having a shear ratio (SR) of 18 or more and comprising at least 20% by weight of a high molecular weight fraction, which high molecular weight fraction has:Type: ApplicationFiled: April 10, 2002Publication date: October 24, 2002Inventor: Etienne Laurent
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Publication number: 20020156222Abstract: The subject invention pertains to a non-pourable homogeneous ultra-low molecular weight ethylene polymer composition and a process for the preparation thereof. Such polymer compositions have longer lamella and a greater degree of crystalline organization than corresponding higher molecular weight materials at an equivalent density.Type: ApplicationFiled: December 21, 2001Publication date: October 24, 2002Inventors: Malcolm F. Finlayson, Ralph E. Guerra, Craig C. Garrison, Martin J. Guest, Brian W. S. Kolthammer, Steven M. Ueligger, Deepak R. Parikh
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Patent number: 6469111Abstract: &agr;-Olefins are polymerized in the gas phase at from 30 to 150° C. and a pressure of from 5 to 80 bar using a catalyst or a catalyst mixture containing as antistatic agent from 0.1 to 5% by weight of ZnO and/or anhydrous MgO, based on the total amount of the catalyst mixture, except for a process in which the catalyst mixture comprises a chromium catalyst and MgO-supported Ziegler catalyst which is modified with an alkene and with alkylaluminum hydride and also comprises free MgO and the total amount of the MgO is not less than 2% by weight of the catalyst mixture.Type: GrantFiled: October 13, 1999Date of Patent: October 22, 2002Assignee: BASF AktiengesellschaftInventors: Shahram Mihan, Arim Lange, Philipp Rosendorfer, Johannes Hack
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Publication number: 20020147288Abstract: New ligands, compositions, metal-ligand complexes and arrays with pyridyl-amine ligands are disclosed that catalyze the polymerization of monomers into polymers. Certain of these catalysts with hafnium metal centers have high performance characteristics, including higher comonomer incorporation into ethylene/olefin copolymers, where such olefins are for example, 1-octene, isobutylene or styrene. Certain of the catalysts are particularly effective at polymerizing propylene to high molecular weight isotactic polypropylene in a solution process at a variety of polymerization conditions.Type: ApplicationFiled: November 6, 2001Publication date: October 10, 2002Inventors: Thomas R. Boussie, Gary M. Diamond, Christopher Goh, Keith A. Hall, Anne M. LaPointe, Margarete K. Leclerc, Cheryl Lund, Vince Murphy
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Patent number: 6462161Abstract: The invention relates to a polyolefin copolymer composition produced with a catalyst having a metallocene, complex in a single reactor for the polymer of an &agr;-olefin monomer with one or more olefin comonomers, and a molecule weight maximum which occurs in that 50 percent by weight of the composition which has the highest weight percent comonomer content. Preferably, the composition has a comonomer partitioning fact Cpf which is equal to or greater than 1.10 or molecule weight partitioning fact Mpf which is equal to or greater than 1.15. Preferred composition also have at least 0.01 long chain branches per 1000 carbon atoms along the polymer backbone. These compositions with reverse molecular engineering have. superior properties and are easily processable due to the simultaneous presence of the association of high molecular weight with high comonomer content and of long chain branching.Type: GrantFiled: November 6, 1998Date of Patent: October 8, 2002Assignee: BP Chemicals LimitedInventors: Larry D. Cady, Christopher J. Frye, Philip Howard, Teresa P. Karjala, Peter J. Maddox, Ian M. Munro, Deepak R. Parikh, S. Roy Partington, Kevin P. Peil, Lee Spencer, William R. Van Volkenburgh, Peter S. Williams, David R. Wilson, J. Mark Winter
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Publication number: 20020143126Abstract: The present invention provides an ethylene resin injection molded article having excellent environmental stress crack resistance and excellent heat resistance. The ethylene resin injection molded article is obtained by injection molding an ethylene/&agr;-olefin copolymer having the following properties: the density is in the range of 0.880 to 0.940 g/cm3; the melt flow rate (MFR) at 190° C. under a load of 2.16 kg is in the range of 1 to 100 g/10 min; the decane-soluble component fraction (W) at room temperature and the density (d) satisfy the relation W<80×exp(−100(d-0.88))+0.1 in case of MFR≦10 g/10 min and the relation W<80×(MFR-9)0.28×exp(−100(d-0.88))+0.1 in case of MFR>10 g/10 min; and the temperature (Tm (°C.)) at the maximum peak position in the endothermic curve as measured by a differential scanning calorimeter (DSC) and the density (d (g/cm3)) satisfy the relation Tm<400×d-250.Type: ApplicationFiled: April 2, 2002Publication date: October 3, 2002Inventor: Mamoru Takahashi
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Publication number: 20020143113Abstract: A process for producing a polymer of an &agr;-olefin which comprises polymerizing an &agr;-olefin having at least 4 carbon atoms in the presence of a catalyst for producing polymers of olefins which comprises (A) a specific metal compound and (B) at least one compound selected from (b-1) an organoaluminum oxy compound and (b-2) an ionic compound.Type: ApplicationFiled: April 15, 2002Publication date: October 3, 2002Applicant: IDEMITSU PETROCHEMICAL CO., LTD.Inventors: Yutaka Minami, Tatsuya Egawa
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Publication number: 20020143123Abstract: Linear low density polyethylenes (LLDPEs) that have relatively high melt index ratios (MIR) and relatively high melt strength (MS) are described. This combination of melt properties is achieved by a substantially non-blended LLDPE. Catalysts used to produce these polyethylenes are generally a blend of bridged bisindenyl zirconocene dichlorides, where one zirconocene contains saturated indenyls and the other unsaturated indenyls.Type: ApplicationFiled: September 27, 2001Publication date: October 3, 2002Inventors: Armenag Hagop Dekmezian, Natalie Ann Merrill
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Patent number: 6458901Abstract: A propylene copolymer comprising propylene, at least one olefin selected from the group consisting of olefins having 2 to 20 carbon atoms except propylene, and a cyclic olefin, wherein the total number of carbon atoms of the monomers except the cyclic olefin is at least 7. This copolymer is mixed with a thermoplastic resin such as polypropylene to provide a thermoplastic resin composition having excellent flexibility, transparency, resistance to whitening on bending, scratch resistance and heat resistance.Type: GrantFiled: May 12, 2000Date of Patent: October 1, 2002Assignee: Sumitomo Chemical Company, LimitedInventors: Keisaku Yamamoto, Hirofumi Johoji, Hidetake Hozumi
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Patent number: 6458910Abstract: Blown films of linear low density polyethylene are produced by a high stalk process comprising extruding the linear low density polyethylene through an annular die to form an extruded tube of molten material, cooling the extruded tube while drawing the tube so cooled, to maintain the tube diameter identical to that of the annular die and expanding the tube or bubble to attenuate the walls thereof by introducing a gas to the interior of the tube or bubble. The resulting films are characterized by superior impact strength and MD tear resistance.Type: GrantFiled: April 15, 1996Date of Patent: October 1, 2002Assignee: ExxonMobil Oil CorporationInventors: Vaseem Firdaus, Pradeep P. Shirodkar
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Publication number: 20020132938Abstract: A process for the gas-phase (co-)polymerisation of olefins in a fluidised bed reactor using a chromium oxide catalyst. The polymerisation is performed in the presence of a process aid additive.Type: ApplicationFiled: March 8, 2002Publication date: September 19, 2002Inventors: David Heslop, Jean-Pierre Isnard, Myung-Je Shin
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Publication number: 20020132939Abstract: A process for the continuous gas-phase (co-)polymerization of olefins in a fluidized bed reactor using a Ziegler-Natta type catalyst. The polymerization is performed in the presence of a process aid additive.Type: ApplicationFiled: March 8, 2002Publication date: September 19, 2002Inventors: Marc Herzog, Jean-Pierre Isnard, Claudine Viviane Lalanne-Magne, Myung Je Shin
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Publication number: 20020132937Abstract: This invention relates to a method to start up an olefin polymerization process comprising:Type: ApplicationFiled: December 6, 2001Publication date: September 19, 2002Inventor: William Howard Sachs
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Publication number: 20020128401Abstract: A solid self-supported cycloalkadienyl catalyst component is disclosed that includes: (i) a mixed metal alkoxide complex which is the reaction product of a magnesium alkoxide or aryloxide and at least one group IVB metal-containing alkoxide or aryloxide; and (ii) Cp, where Cp is a cyclic or polycyclic hydrocarbon having from 3-30 carbon atoms. A self-supported hybrid catalyst also is disclosed which contains the above components (i) and (ii), as well as (iii) a Ziegler-Natta catalyst species. A method of making the self-supported cycloalkadienyl catalyst and the self-supported hybrid catalyst and a method of polymerizing olefins using the catalysts also are disclosed. The catalysts are capable of producing polyolefins in high yield having a broad molecular weight distribution, or a bimodal distribution.Type: ApplicationFiled: December 28, 1999Publication date: September 12, 2002Inventors: ROBERT CHARLES JOB, WALTER THOMAS REICHLE
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Patent number: 6448355Abstract: Elastic fibers and fabrics made from homogeneously branched substantially linear ethylene polymers are disclosed which can be produced on conventional polypropylene or polyethylene fiber or fabric processes. They can be used to produce highly elastic structures that can have recycle compatibility between elastic and non-elastic components. The novel fibers have at least about 50% recovery at 100% strain. The fibers and fabrics are especially useful in making fabricated articles and components thereof (e.g., disposable diapers).Type: GrantFiled: July 30, 1996Date of Patent: September 10, 2002Assignee: The Dow Chemical CompanyInventors: George W. Knight, Rexford A. Maugans, Edward N. Knickerbocker
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Patent number: 6448350Abstract: Ethylene based copolymers having high molecular weights, narrow molecular weight distributions, and a very good homogeneous distribution of the comonomer units can be obtained in high yields at temperatures of industrial interest, by carrying out the polymerization reaction in the presence of metallocene catalysts comprising particular bridged bis-indenyl compounds substituted in the 3-position on the indenyl groups.Type: GrantFiled: December 17, 1999Date of Patent: September 10, 2002Assignee: Basell Technology Company BVInventors: Tiziano Dall'Occo, Luigi Resconi
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Patent number: 6448357Abstract: A polyolefin resin composition comprising (A) an ethylene-based polyolefin having a density of 0.865 to 0.980 g/cm3 and MFR of 0.01 to 50 g/10 min, (B) a phosphorous compound, and (C) at least one heat stabilizer selected from the group consisting of a phenol-based heat stabilizer and a tocopherol-based heat stabilizer. The polyolefin resin composition has excellent heat resistance, moisture resistance and discoloration resistance, and also when used as a packaging material, does not impair the taste of contents to be packaged, such as flavor or odor, and therefore does not impair the taste of the contents.Type: GrantFiled: July 14, 2000Date of Patent: September 10, 2002Assignee: Mitsui Chemicals, Inc.Inventors: Naoshi Hamada, Sadamu Hirakawa, Akihiko Yamamoto
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Patent number: 6448349Abstract: Metallocene catalysts useful for the preparation of syndiotactic/atactic block polyolefins have the general formula R″(C4R′mC5C4R′n)XMeQ wherein X is an hetero-atom ligand with one or two lone pair electrons selected from the elements of Group VA or VIA which can be substituted or non-substituted; (C4Rm′C5C4Rn′) is a fluorenyl or a symmetrically substituted fluorenyl or cyclopentadienyl ring; R′ is hydrogen or hydrocarbyl radical having from 1-20 carbon atoms, a halogen, an alkoxy, and alkoxy alkyl or an alkylamino or alkylsilylo radical, each R′ may be the same or different and m and n independently are 0, 1, 2, 3 or 4, with the proviso that the bilateraly symmetry is maintained; R″ is a structural bridge between X and the (C4R′mC5C4R′n) ring to impart stereorigidity; Q is a hydrocarbyl radical having 1-20 carbon atoms or is a halogen; Me is a Group IIIB, IVB, VB, or VIB metal as positioned in the Periodic Table of Elements; and Me can be in any oType: GrantFiled: November 8, 1999Date of Patent: September 10, 2002Assignee: Fina Research, S.A.Inventor: Abbas Razavi
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Publication number: 20020123581Abstract: The present invention relates to a process for the preparation of rubber-like ethylene/&agr;-olefin copolymers and ethylene/&agr;-olefin/non-conjugate diene terpolymers using a metallocene as catalyst, which process is characterized in that the metallocene used is a compound of the general formula (I) 1Type: ApplicationFiled: July 13, 2001Publication date: September 5, 2002Inventors: Peter Schertl, Wolfgang Nentwig, Rudiger Engehausen, Walter Kaminsky, Ulrich Weingarten
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Patent number: 6444748Abstract: A process for preparing aqueous polymer dispersions by means of a polymerization, conducted in an aqueous system, of at least one free-radically polymerisable ethylenically unsaturated monomer in the presence of a polymerisation initiator, wherein the pH of the aqueous dispersion is adjusted during the preparation process by adding at least two different, basic reagents, at least one of said basic reagents being added in a plurality of stages.Type: GrantFiled: December 8, 1999Date of Patent: September 3, 2002Assignee: BASF AktiengesellschaftInventors: Maximilian Angel, Karl Kolter, Axel Sanner
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Publication number: 20020119088Abstract: 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 comprise 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.Type: ApplicationFiled: February 28, 2002Publication date: August 29, 2002Applicant: Phillips Petroleum CompanyInventor: Joseph S. Shveima
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Publication number: 20020115805Abstract: A copolymer of ethylene and at least one comonomer containing at least 4 carbon atoms is characterized by a polydispersity greater than 2, a broad melting point transition as measured by differential scanning calorimetry, and a narrow composition distribution. Ethylene/C4+ copolymers also may show at least one peak melting point above the peak melting point of a random copolymer of the same monomer unit composition. These copolymers are made by contacting ethylene and a comonomer under polymerization conditions in the presence of a suitable fluxional catalyst system.Type: ApplicationFiled: February 15, 2002Publication date: August 22, 2002Applicant: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Robert M. Waymouth, Jennifer L. Maciejewski Petoff, Raisa L. Kravchenko
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Publication number: 20020115806Abstract: Fluorinated amine compounds, R′iArF-ER2, where ArF is a fluoroaryl substituent, E is nitrogen or phosphorous, each R is independently a C1-C20 hydrocarbyl substituent, or the two R's may be connected to form an unsubstituted or substituted C2-C20 cycloaliphatic substituent, R′ is a C1-C20 hydrocarbyl or halogenated hydrocarbyl, and i is 0, 1 or 2 are disclosed. These compounds may be protonated and complexed with suitable substantially noncoordinating anions to prepare polymerization catalyst components. When these catalyst components are combined with organometallic catalyst precursors, the catalyst precursor is activated to a catalyst. This catalyst is combined with monomer under olefin polymerization conditions to prepare polymer. High number-average molecular weight polymers at high productivity rates were observed from using metallocene catalysts activated with [N-pentafluorophenyl pyrrolidinium][tetrakis(pentafluorophenyl)borate].Type: ApplicationFiled: December 11, 2000Publication date: August 22, 2002Inventor: George Rodriguez
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Patent number: 6437064Abstract: Copolymers of ethylene and alpha olefins that have been formed by a polymerization reaction in the presence of a single site catalyst, such as a metallocene, are used as a film or as a layer in multiple layer films, including molecularly oriented and irradiated heat shrinkable films. Novel blends of the copolymers with other polymeric materials are disclosed and used as a film or a layer in a film particularly in molecularly oriented and heat shrinkable films. Bags made from the multiple layer films are especially useful for shrink packaging primal cuts of meat. Processes for the formation of flexible films and packages made therefrom are also disclosed.Type: GrantFiled: January 14, 1998Date of Patent: August 20, 2002Assignee: Pechiney Emballage Flexible EuropeInventors: John P. Eckstein, Johnny Q. Zheng, Mark E. Nordness, Keith D. Lind, George H. Walburn, Mary E. Shepard, Gregory K. Jones, Gregory J. Seeke
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Publication number: 20020107343Abstract: The present invention provides ethylene polymers capable of preparing various molded articles such as films, sheets or the like, and having excellent moldability, particularly excellent high-speed moldability.Type: ApplicationFiled: February 6, 2002Publication date: August 8, 2002Applicant: MITSUI CHEMICALS, INC.Inventors: Norio Kashiwa, Shingo Matsuo, Shinichi Kojoh, Mamoru Takahashi