Abstract: The invention provides a catalyst system and a method of making polyethylene using the catalyst system, the method comprising combining ethylene; an activator; and a metallocene catalyst compound; wherein in one embodiment the metallocene catalyst compound is selected from: wherein M is a Group 4 atom; X is a leaving group; n is an integer from 0 to 3; and R1 to R12 are independently selected from hydrides, halogens, hydroxy, C1 to C6 alkoxys, C1 to C6 alkenyls, and C1 to C10 alkyls; characterized in that when the comonomer is 1-hexene, and the mole ratio of 1-hexene to ethylene combined is varied between 0.015 to 0.05, the density of the resultant polyethylene changes by less than 5% and the I21/I2 varies from 10 to 150.

Abstract: Ethylene and optional comonomers are polymerized using a supported metallocene catalyst, an alumoxane activator, and triisobutylaluminum (TIBAL). A silica support is first pretreated with a silane compound and then with an organoboron compound. The treated silica is then combined with a Group 4 metallocene complex and an alumoxane to generate a supported, activated catalyst. While it was previously thought that the particular support treatment technique used herein provided benefits only for polymerizations catalyzed by non-metallocene single-site complexes, it has now been found that similar benefits can be realized even with conventional metallocenes if TIBAL is selected as the scavenger.

Abstract: Disclosed herein are processes for polymerizing ethylene, acyclic olefins, and/or selected cyclic olefins, and optionally selected olefinic esters or carboxylic acids, and other monomers. The polymerizations are catalyzed by selected transition metal compounds, and sometimes other co-catalysts. Since some of the polymerizations exhibit some characteristics of living polymerizations, block copolymers can be readily made. Many of the polymers produced are often novel, particularly in regard to their microstructure, which gives some of them unusual properties. Numerous novel catalysts are disclosed, as well as some novel processes for making them. The polymers made are useful as elastomers, molding resins, in adhesives, etc.

Abstract: A process for preparing and controlling the density of high density polyethylene in the gas phase comprising contacting ethylene or a mixture of ethylene and one or more alpha-olefins with a chromium oxide catalyst supported on a granular or microspherical refractory oxide in a fluidized bed reactor in the presence of oxygen.

Abstract: A process for producing a polyolefin according to the present invention comprises (co) polymerizing one or two or more ?-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.

Abstract: A process for the gas-phase (co-)polymerization of olefins in a fluidised bed reactor using a Ziegler-Natta type catalyst characterised in that the polymerisation is performed in the presence of an additive having the formula R—Cl where R is an alkyl group of 2 to 7 carbon atoms.

Abstract: A multimodal polymer composition for pipes is disclosed. The polymer is a multimodal polyethylene with a density of 0.930-0.965 g/cm3, an MFR5 of 0.2-1.2 g/10 min, an Mn of 8000-15000, an Mw of 180-330×103, and an Mw/Mn of 20-35, said multimodal polyethylene comprising a low molecular weight (LMW) ethylene homopolymer fraction and a high molecular weight (HMW) ethylene copolymer fraction, said HMW fraction having a lower molecular weight limit of 3500, and a weight ratio of the LMW fraction to the HMW fraction of (35-55):(65:45).

Abstract: An ethylene-based polymer resin which is obtained by copolymerizing ethylene with an ?-olefin having 5 to 20 carbon atoms, and has a melt flow rate (MFR) measured at 190° C. under a load of 21.18 N according to JIS K7210-1995, of not less than 0.01 g/10 min. and less than 1 g/10 min., wherein the melt flow rate and a melt tension(MT) at 190° C. (unit: cN) of the resin satisfy a relation of the following expression (1) and an intrinsic viscosity [?] (unit: dL/g) and the melt flow rate of the resin satisfy a relation of the following expression (2): 2×MFR?0.59<MT<3.6×MFR?0.66??(1) 1.02×MFR?0.094<[?]<1.50×MFR?0.156??(2).

Abstract: The present invention is directed to homo-polymers and copolymers of mono-1-olefins, a method of making such polymers,and uses of such polymers. Polymers of the present invention are formed by contacting at least one mono-1-olefin having from 2 to about 20 carbon atoms per molecule and at least one mono-1-olefin co-monomer having from 2 to about 10 carbon atoms per molecule in a reaction zone under polymerization conditions in the presence of a hydrocarbon diluent, a catalyst system, and a cocatalyst. In another aspect of the present invention, ethylene copolymers are employed to produce PE-100 pipe. Further, these ethylene copolymers may be employed to produce PE-100 pipe having both small diameters and diameters in excess of 42 inches substantially without sagging or other gravitational deformation. Copolymers of ethylene and 1-hexene are disclosed which are used to produce PE-100 pipe.

Abstract: 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.

Abstract: The process for producing an olefinic polymer comprises introducing a saturated aliphatic hydrocarbon in a liquid phase state and in a vapor phase state into the aforementioned fluidized-bed and (co)polymerizing in the condition that when the inside radius of the cylinder section of the fluidized-bed reactor is defined as a distance of 1, the relationship between the concentration (C1) of the saturated aliphatic hydrocarbon put in a liquid state in the peripheral portion of the cylinder section at a relative distance of 0.7 to 1.0 from the center of the cylinder section as a start point and the concentration (C2) of the saturated aliphatic hydrocarbon put in a liquid state in the center portion of the cylinder section at a relative distance less than 0.7 from the center fulfills the following equation: C1>C2 at a place close to the upstream section of said gas distributing plate.

Abstract: A process to produce ethylene polymers is provided. Particularly, a process to produce ethylene polymers having a broad molecular weight distribution is provided. More particularly, a process to produce ethylene polymers that have low formation of smoke and odor during blow molding is provided.

Abstract: A continuous vapor-phase fluidized-bed process for the preparation of ethylene homopolymers and copolymers having a density of from 0.87 to 0.97 g/cm3 in which ethylene or mixtures of ethylene and C3-C8 a-monoolefins are (co)polymerized in the presence of a supported chromium catalyst in the polymerization zone of a vapor-phase fluidized-bed reactor under pressures ranging from 1 to 100 bar and at temperatures ranging from 30° to 125° C. in the vapor phase in an agitated bed of bulk material comprising particulate polymer, the resultant heat of polymerization is removed by cooling the recirculated reactor gas and the resulting (co)polymer is removed from the vapor-phase fluidized-bed reactor, wherein, for the preparation of a (co)polymer of a specific density d, the (co)polymerization is carried out at a temperature which is in a range restricted by an upper envelope defined by equation I T H = 171 + 6 ? ? ? d ? 0.

Abstract: The additive (b) for a communication cable filler according to the present invention contains as a main component an ethylene/?-olefin copolymer (a) having a number-average molecular weight (Mn), measured by GPC, of 500 to 5,000 and having a crystallizing temperature (Tc (° C.), rate of temperature decrease: 2° C./min) measured by DSC and a density (D (kg/m3)) measured by a density gradient tube method, said Tc and D satisfy the following formula (1): 0.501×D(kg/m3)?366?Tc(° C.)??(1). The communication cable filler (c) according to the invention is prepared by blending (X) 40 to 90% by mass of polybutene (d) having a number-average molecular weight of 200 to 2,400, (Y) 1 to 50% by mass of an oil (e) and (Z) 1 to 15% by mass of the ethylene/?-olefin copolymer (a). The additive for a communication cable filler and the communication cable filler are excellent in the filling workability and the oil retention properties of a cable jelly.

Abstract: 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.

Abstract: This invention relates to a transition metal catalyst compound represented by the formula: LMX2 or (LMX2)2 wherein each M is independently a Group 7 to 11 metal, preferably a Group 7, 8, 9, or 10 metal; each L is, independently, a tridentate or tetradentate neutrally charged ligand that is bonded to M by three or four nitrogen atoms, (where at least one of the nitrogen atoms is a central nitrogen atom and at least two of the nitrogen atoms are terminal nitrogen atoms), and at least two terminal nitrogen atoms are substituted with one C3-C50 hydrocarbyl and one hydrogen atom or two hydrocarbyls wherein at least one hydrocarbyl is a C3-C50 hydrocarbyl, and the central nitrogen atom is bonded to three different carbon atoms or two different carbon atoms and one hydrogen atom; X is independently a monoanionic ligand, or two X may join together to form a bidentate dianionic ligand.

Abstract: A multi-catalyst system is disclosed. The catalyst system comprises catalyst A and catalyst B. Catalyst A comprises a supported bridged indenoindolyl transition metal complex. Catalyst B comprises a supported non-bridged indenoindolyl transition metal complex. The catalyst system of the invention produces polyolefins which have bi- or multi-modal molecular weight distribution.

Abstract: 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.

Abstract: The present invention provides a method of forming a polyolefin resin having a relatively high densities and a long chain branch index (“LCB”) greater than about 1. The method of the invention comprises forming a reaction mixture by combining molecular hydrogen, a first olefin, an optional second olefin, a diluent, and a vanadium-containing catalyst system at a sufficient temperature to allow formation of the polyolefin resin and initiating polymerization of the reaction mixture.

Abstract: An improved process for the polymerisation of olefin monomer selected from (a) ethylene, (b) propylene, (c) mixtures of ethylene and propylene and (d) mixtures of (a), (b) or (c) with one or more alpha-olefins in a fluidised bed gas phase reactor, said process comprising passing a gaseous mixture of said olefin monomers(s) through the fluidised bed under effective polmerisation conditions to provide a polymer product containing unreacted monomer(s) and a gaseous effluent stream comprising unreacted monomer(s), removing the polymer product to a degassing vessel, recycling a first portion of the gaseous effluent stream to the fluidised bed and passing a second portion of the gaseous effluent stream to counter currently contact the polymer product in said degassing vessel to produce a polymer product having a reduced amount of unreacted monomer(s), characterised in that the improvements to the process comprise: (i) removing heavy hydrocarbons from the second portion of the effluent stream and returning said hydr

Abstract: The present invention provides a method of synthesizing fluorided metallocene catalyst components comprising contacting at least one fluoriding agent comprising fluorine with one or more alkylated metallocene catalyst components comprising one or more non-halogen leaving groups to produce a fluorided catalyst component; wherein from less than 3 equivalents of fluorine are contacted for every equivalent of leaving group.

Abstract: The invention relates to a process for the preparation of a multimodal A-olefin polymer comprising polymerising in a polymerisation stage at least one A-olefin in the presence of a multisite catalyst and an adjuvant so as to produce a polymer having a relatively lower molecular weight component and a relatively higher molecular weight component, said adjuvant being selected from the group consisting of phosphines, phosphites, acetylenes, dienes, thiophenes and aluminium alkyls and said adjuvant being capable of altering the ratio of the fraction of higher molecular weight component to the fraction of the lower molecular weight component by at least 10%.

Abstract: Continuous gas-phase polymerization process for preparing ethylene and propene homopolymers and copolymers, in which ethylene, propene or mixtures comprising ethylene or propene and C3-C8-&agr;-monoolefins are polymerized in the polymerization zone of a gas-phase polymerization reactor at from 30 to 125° C. and pressures of from 1 to 100 bar in the gas phase in a bed comprising finely divided polymer in the presence of a catalyst. To remove the heat of polymerization, the reactor gas is circulated and firstly passes through a cyclone after leaving the reactor. To prevent polymer deposits in the circulating gas system, a catalyst poison having a boiling point above the maximum temperature within the circulating gas system is fed into this circulating gas system at a position between the reactor and the cyclone.

Abstract: The subject invention pertains to branched polyolefin materials that exhibit temperature-sensitive permeability. The subject invention also concerns a package including a polymer material that exhibits temperature-sensitive permeability and separates a respiring article from the surrounding atmosphere. Methods of the subject invention involve placing a respiring article within a container comprising a polymer material exhibiting temperature-sensitive permeability.

Abstract: A method and an apparatus of discharging polymer from a continuously operated gas phase reactor, wherein at least one monomer is polymerized in a bed containing active catalyst formed by catalyst and polymer particles suspended in a fluid, the bed defining a fluidized bed level in said reactor. The invention comprises continuously withdrawing polymer powder from the reactor; and adjusting the discharge rate of the polymer powder so as to maintain a constant bed level during polymerization. By means of the invention the discharge of the polymer can be made truly continuous without any disturbance of the polymerization. The rate of withdrawn polymer can be flexibly adjusted depending on the progress of the polymerization and it can also easily be scaled up if the capacity of the reactor is increased.

Abstract: The invention relates to a method to safely produce, handle and transport packaged organic peroxide formulations comprising a reactive phlegmatiser and to the use of such packaged material in polymerisation and polymer modification processes, particularly the high-pressure (co)polymerisation process of ethylene and/or the suspension (co)polymerisation process of styrene.

Abstract: 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.

Abstract: 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.

Abstract: This invention is related to extruded pipe resins comprising polyethylene.

Abstract: A disengagement vessel employing a lock hopper effectively reduces concentration of non-polymer-associated components in the polymer product slurry of a first olefin slurry polymerization reactor, allowing cascading of a second slurry polymerization reactor operating at lesser concentration of comonomers, hydrogen, and other components to produce multicompositional polyolefin polymers and/or polymers having a multimodal monomer distribution, e.g. diblock polymers having substantially non-overlapping comonomer contents between the blocks.

Abstract: Disclosed is a method of producing a polyolefin composition comprising contacting a metallocene pre-catalyst with a substoichiometric amount of a co-catalyst; adding a first olefin monomer; and polymerizing the first monomer for a time sufficient to form the polyolefin. The method allows for the use of a minimum amount of activating co-catalyst, and allows for the production of stereoregular and non-stereoregular polyolefins. The use of configurationally stable metallocene pre-catalysts allows for the production of monomodal isotactic polyolefins having narrow polydispersity. The use of configurationally unstable metallocene pre-catalysts allows for the production of monomodal atactic polyolefins having narrow polydispersity. The method of the present invention optionally further comprises contacting the polyolefin with a second amount of said co-catalyst; adding a second olefin monomer; polymerizing said second olefin monomer to form a block-polyolefin composition.

Abstract: The invention provides ethylene/&agr;-olefin copolymers exhibiting improved environmental stress cracking resistance properties, and methods for the production of the copolymers in a single reactor by means of a bimetallic catalyst including a Ziegler component and a metallocene component.

Abstract: The present invention provides a catalyst for olefin polymerization having high olefin polymerization activity without being accompanied by generation of an adhered polymer on the wall of a polymerization reactor and the wall of pipe line and generation of a blocking massive polymer, and capable of manufacturing an olefin polymer industrially and stably for a long period of time.

Abstract: There is provided a process for the copolymerisation of propylene with at least one C4-20 &agr;-olefin or C4-20 diene in a reaction medium in the presence of a catalyst system at a temperature of greater that 80° C. or at a temperature and pressure above the critical temperature and pressure of the reaction medium. Under such conditions, comonomer incorporation is higher than under standard conditions.

Abstract: 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.

Abstract: High density polyethylene having reduced melt elasticity and a reduced level of highly short-chain branched polymer molecules and wire and cable insulation compositions based thereon having improved strippability and oxidative stability are provided.

Abstract: The invention provides a process for the preparation of a propylene polymer in which propylene and a comonomer copolymerizable therewith and of greater molecular weight than propylene are polymerized in a single site catalyst catalized polymerization reaction, characterised in that said polymerization reaction is effected at least in part at a temperature of at least 70° C.

Abstract: An olefin polymerization catalyst system, comprising a catalyst represented by the general formula CrR4, wherein each R is independently a hydrocarbyl or substituted hydrocarbyl, with the proviso that R may not be a cyclopentadienyl group, an activator represented by the general formula, MQ2, where M is a Group II metal, where each Q is independently an alkyl, or substituted alkyl; and a support. The support may be organic or inorganic. Ethylene and one or more olefins may be polymerized by the catalyst system.

Abstract: Olefinic interpolymer compositions comprising the olefinic interpolymer, residuals from a transition metal catalyst and boron containing activator package, and a charge dissipation modifier and methods for making them. The compositions have dissipation factors that are at least 50% less than the corresponding olefinic interpolymer compositions which have not been treated with charge dissipation modifiers. The compositions are useful in wire and cable applications.

Abstract: A complex of transition metal Ti, Fe, Co, Ni, Cr, Mn, Ta, Rh, Y, Sc, Ru, Pd, Zr, Hf, V or Nb and a mono-, bi-, tri-, or tetra-dentate ligand, wherein at least one of the donor atoms of the ligand is a nitrogen atom N with a 5-membered heterocyclic substituent joined to the N by a carbon atom. The complex is preferably formula (I) wherein R5—N-G-X1 is a bi-, tri.

Abstract: An olefin polymerization process wherein monomer, diluent and catalyst are circulated in a continuous loop reactor and product slurry is withdrawn and passed through a heated conduit to a cyclone. The cyclone allows better separation of vaporized diluent. In a preferred embodiment, the slurry is heated in a flashline heater so that a high percentage of the withdrawn diluent is vaporized. The vaporized diluent and concentrated intermediate product are passed to a cyclone where a majority of the vaporized diluent is separated and thereafter condensed by heat exchange, without compression, and recycled to the reactor. Also an apparatus for separating vaporized diluent and polymer particles using a cyclone.

Abstract: Copolymers of ethylene have from 1 to 30 mol % of alkyl(meth)acrylates and, if desired, other comonomers, and have a residual comonomer content of less than 0.5% by weight in the copolymer. A process for preparing copolymers of this type in a combination of stirred autoclave and tubular reactor is described, as is the use of the copolymers for preparing polyamide molding compositions.

Abstract: A process for preparing a mixed catalyst compound used in the polymerization of polyolefins to produce bimodal polyethylenes is disclosed. In an embodiment, a process of preparing the mixed catalyst system includes: mixing a first catalyst and an activator in a first liquid medium to form a first mixture, combining a support with the first mixture to form a first support slurry, drying the first support slurry in an extent sufficient to provide a dried supported first catalyst, mixing the dried supported first catalyst in a second liquid medium to form a second support slurry, and combining one or more additional catalysts with the second support slurry to provide the mixed catalyst compound.

Abstract: Supported catalyst composition for polymerization of olefins comprising: (i) a titanium compound, a magnesium compound and at least one electron donor compound; (ii) an oxygen containing polymer support; and (iii) a cocatalyst comprising at least one aluminum compound.

Abstract: A novel loop/slurry olefin polymerization process is provided which produces ultra high molecular weight ethylene homopolymers and ultra high molecular weight ethylene copolymers. Catalyst systems used are selected from the group consisting of inorganic oxide supported titanium-containing catalyst systems, inorganic oxide supported organo-zirconium catalyst systems and inorganic oxide supported organo-hafnium catalyst systems.

Abstract: Polymerization processes for ethylene and at least one mono-1-olefin comonomer having from about three to eight carbon atoms per molecule in the presence of a twice-aged catalyst system comprising chromium supported on a silica-titania support and a trialkylboron compound is provided. Novel ethylene copolymers also are produced.

Abstract: 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.

Abstract: The invention relates to continuous gas fluidized bed methods for making a polymer featuring a condensing agent in a recycle stream; and also to methods for monitoring and providing continuity in a gas fluidized bed method for making a polymer featuring a condensing agent in a recycle stream. Certain ranges of &Dgr;&rgr;, in some cases combined with certain ranges of values for An, can be used to find and define desirable operating states, i.e., the “steady state,” “alert state,” “corrective action state,” “continuity impairment state” and/or “&Dgr;&rgr; alarm state,” for the gas fluidized bed reactor polymerization method (where &Dgr;&rgr;, An and the particular states are disclosed herein).

Abstract: This invention relates to a process to polymerize olefins comprising contacting, in a polymerization system, olefins having three or more carbon atoms with a catalyst compound, activator, optionally comonomer, and optionally diluent or solvent, at a temperature above the cloud point temperature of the polymerization system and a pressure no lower than 10 MPa below the cloud point pressure of the polymerization system, where the polymerization system comprises any comonomer present, any diluent or solvent present, the polymer product, where the olefins having three or more carbon atoms are present at 40 weight % or more.

Abstract: Shear-thinning ethylene/&agr;-olefin and ethylene/&agr;-olefin/diene monomer interpolymers that do not include a traditional branch-inducing monomer such as norbornadiene are prepared at an elevated temperature in an atmosphere that has little or no hydrogen using a constrained geometry complex catalyst and an activating cocatalyst.