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 propylene polymer of the invention is transparent and has good low-temperature heat-sealability and scratch resistance, and is favorable to wrapping and packaging films. (1) The polymer has a melting point, Tm (° C.), measured through differential scanning calorimetry, of 110≦Tm≦140; (2) its heat of fusion &Dgr;H (J/g) and melting point Tm (° C.) satisfy &Dgr;H≧0.45×Tm+22; (3) the half-value width Th (° C.) of the peak top of its elution curve obtained in programmed-temperature fractionation is Th≦5; and (4) its intrinsic viscosity [&eegr;] (dl/g) measured in a solvent of tetralin at 135° C. falls between 0.5 and 5.

Abstract: A polymerization process with elevated productivity using a coordination catalyst, wherein electromagnetic radiation is applied during polymerization. The irradiation of light greatly increases the activity of the coordination catalyst.

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 present invention relates to a continuous process for controlling the gas-phase co-polymerisation of olefins in a fluidised bed reactor. The present invention further relates to a method for the continuous gas-phase (co-)polymerisation of olefins in a fluidised bed reactor in the presence of a polymerisation catalyst wherein the density of the polymer powder particles leaving the reactor is maintained constant by controlling the particle size distribution of the polymerisation catalyst. The present invention also relates to a process for controlling the particle size distribution of a polymerisation catalyst in order to achieve the production of a polymer powder of constant density during the continuous gas-phase (co-)polymerisation of olefins in a fluidised bed reactor.

Abstract: A process for polymerizing olefins is disclosed. The process combines a bridged indenoindolyl organometallic complex and an activator with a support material in the presence of an aromatic solvent. The supported catalyst containing the aromatic solvent is used to polymerize an olefin in the presence of hydrogen. Polyolefins from the process have improved flow properties.

Abstract: A process for preparing olefinic living polymers having a molecular weight distribution (Mw/Mn) of 1 to 1.3, comprising polymerizing an olefinic monomer having 2 to 20 carbon atoms at low temperatures in the presence of a catalyst comprising (A) a hafnium or zirconium-containing compound having one or two cyclopentadienyl backbones, (B) a triphenyl boron compound or a tetraphenyl borate compound and optionally (C) a specific mono-, di- or trialkylaluminum compound. When the catalyst comprising the zirconium-containing compound is prepared by further using a titanium-containing compound (D), the polymerization temperature can be raised.

Abstract: Embodiments of the present invention include a polypropylene homopolymer synthesized from a metallocene catalyst system and methods of forming the homopolymer, the homopolymer having an aluminum and chlorine recoverables value of less than 25 ppm and a xylene solubles of less than 1 wt % relative to the total weight of the homopolymer. The resulting homopolymer has other desirable properties such as a heat deflection temperature at 0.45 MPa of from 90° C. to 110° C., and a MWD value of from 1.7 to 5.0. These properties make embodiments of the homopolymer desirable for films, and in particular for capacitor films.

Abstract: A solid catalyst component comprises a transition metal-containing metallocene compound, a non-cyclopentadienyl transition metal compound, a magnesium compound and a polymeric material which acts as a support. The catalyst component is combined with co-catalyst organoaluminum compound or a mixture of organoaluminum compounds to provide a catalyst composition useful for olefin polymerization, e.g., to produce linear low, medium and high density polyethylenes or copolymerization of ethylene with alpha-olefins. Product polyolefin polymers have a varied range of molecular weight distributions. The catalyst composition is prepared by a process comprising combining polymer support particles, magnesium compound, transition metal-containing metallocene compound, and non-cyclopentadienyl transition metal compound to provide a solid catalyst component, and, combining the solid catalyst component with a cocatalyst compound to provide a polyolefin polymerization catalyst composition.

Abstract: The present invention is a process for transitioning from a first polymerization reaction to a second polymerization reaction incompatible with the first polymerization reaction in a gas-phase reactor. The novel process comprises conducting multiple polymerization reactions, capturing and storing a substantially contaminant-free polymerization product from each multiple polymerization reaction for use as a selected substantially contaminant-free seedbed in a second polymerization, wherein the polymerization product from each multiple polymerization reaction is rendered substantially contaminant-free by stripping or venting reactants and contaminants and is maintained as substantially contaminant-free by storage under an inert atmosphere.

Abstract: An object of the present invention is to provide a novel propylene-based polymer capable of providing a propylene-based polymer with a good adhesion and coatability.

Abstract: A solution polymerization process using a phosphinimine catalyst and a boron activator is conducted at a temperature of about 170° C. or greater in the presence of trialkyl aluminum to produce polyethylene having a comparatively broad molecular weight distribution. The polyethylene product produced by the process of this invention is desirable because it can provide enhanced “processability” in comparison to polyethylene having a narrow molecular weight distribution. The process of this invention is advantageous in comparison to prior art processes for the preparation of “broad” polyethylene which use two polymerization reactors and/or more than one polymerization catalyst. The polymers produced by the process of this invention are potentially suitable for the preparation of plastic film. For example, a polyethylene according to this invention and having a density of about 0.

Abstract: A poly(&agr;-olefin) copolymer obtained from the polymerization of at least one &agr;-olefin having from 2 to about 20 carbon atoms and at least one bulky olefin, the process comprising polymerizing the monomers in the presence of hydrogen and a catalytically effective amount of a catalyst comprising the product obtained by combining a metallocene procatalyst with a cocatalyst; lubricant compositions comprising such poly(&agr;-olefin) copolymer; and a method for improving the viscosity index of a lubricant composition using such poly(&agr;-olefin) copolymer.

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: 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: A catalyst system useful for polymerizing olefins is disclosed. The catalyst system includes an organometallic complex that incorporates a Group 3 to 10 transition metal and an annulated cyclopentadienyl ligand that is pi-bonded to the metal. A one-pot method for making organometallic complexes from fulvene precursors is also disclosed. Additionally, the invention includes bimetallic complexes from cyclopentazulenyl compounds and a one-pot method for making them. Molecular modeling studies reveal that organometallic complexes incorporating such annulated cyclopentadienyl ligands, when combined with an activator such as MAO, should actively polymerize olefins.

Abstract: The present invention relates to a transition metal compound represented by the general formula (I), and a olefin polymerization catalyst comprising above transition metal compound and activating co-catalyst as the main components. (wherein, M represents a metal element in the groups 3 to 10 of the periodic table or in the lanthanoide series, X represents a &sgr; bonding ligand bonded to M, Y represents a Lewis base, A represents a cross-linking group, p is an integer of 1 to 20, q is an integer of 1 to 5 and represents [(valence of M)−2], r is an integer of 0 to 3. R1 represents a group in above R2 to R9 except hydrogen atom). The present invention provides a transition metal compound useful for olefin polymerization catalyst, and olefin polymerization catalyst using above compound.

Abstract: A process is disclosed for the preparation of a poly(&agr;-olefin) polymer wherein the process comprises polymerizing at least one &agr;-olefin in the presence of hydrogen and a catalytically effective amount of catalyst comprising the product obtained by combining a metallocene catalyst with a cocatalyst, the metallocene catalyst being at least one meso compound of general formula: 1

Abstract: A new class of methylene-bridged metallocenes of formula (I), wherein M is a transition metal of group 3, 4, 5, 6, lanthanide or actinide; X is a monoanionic sigma ligand; R1 can be alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl radicals; R2 can be halogen, alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl radical; p is 0-3; m is 0-2; and n is 0-4. Furthermore, the corresponding ligands, a new process for their preparation and catalysts systems containing said methylene-bridged metallocenes are described.

Abstract: An olefin polymerization process is disclosed. The polymerization is performed in the presence of a clay, an activator, and a transition metal complex that has at least one pyridine moiety-containing ligand. The presence of clay increases the catalyst activity. The process is suitable for making ultra-high molecular weight polyethylenes (UHMWPE). The UHMWPE produced has increased bulk density.

Abstract: This invention relates to processes for transitioning among polymerization catalyst systems, preferably catalyst systems, which are incompatible with each other. Particularly, the invention relates to processes for transitioning among olefin polymerization reactions utilizing Ziegler-Natta catalyst systems, metallocene catalyst systems and chromium-based catalyst systems.

Abstract: Disclosed is a novel bidentate pyridine transition metal catalyst having the general formula where each R is independently hydrogen, C1-6 alkyl, or C6-14 aryl; where each R′ is independently R, C1-6 alkoxy, C7-20 alkaryl, C7-20 aralkyl, halogen, or CF3; where M is a Group 3 to 10 metal; where each X is independently halogen, C1-6 alkyl, C6-14 aryl, C7-20 alkaryl, C7-20 aralkyl, C1-6 alkoxy, or  L is X, cyclopentadienyl, C1-16 alkyl-substituted cyclopentadienyl, fluorenyl, indenyl, or  where n is an integer from 1 to 4; a is an integer from 1 to 3; b is an integer from 0 to 2; the sum of a+b≦3; c is an integer from 1 to 6; and the sum a+b+c equals the oxidation state of M.

Abstract: The present invention is a process for transitioning from a first polymerization catalyst system to a second polymerization catalyst system incompatible with the first polymerization catalyst system in a gas-phase reactor. The novel process comprises conducting a first polymerization reaction using a first polymerization catalyst system; stopping the first polymerization reaction; removing the contents of the first polymerization reaction from the reactor while maintaining a substantially closed system; then, in the substantially closed system, introducing a substantially contaminant free seedbed into the reactor; introducing a second feed system and a second catalyst system into the reactor; and conducting a second polymerization reaction.

Abstract: Catalytic composition for the (co)polymerization of ethylene and other &agr;-olefins, including a metallocene complex of a metal M of group 4 of the periodic table or the product obtainable from the same combined with a suitable activator, wherein said metallocene complex includes at least one cyclopentadienyl group and at least one unsaturated hydrocarbyl organic group bonded to the metal M, having the following formula (I):

Abstract: A high-temperature solution process for making polyolefins is disclosed. Olefins polymerize at greater than about 130° C. in the presence of an activator and an organometallic complex. The complex includes a bridged indenoindolyl ligand. One part of the ligand is a second indenoindolyl group or a polymerization-stable, cyclopentadienyl-like group having an extended pi-electron system. Because the catalysts activate quickly and thoroughly, even with low levels of an alumoxane, the invention provides an efficient way to make high-molecular-weight (Mw>100K) polyolefins.

Abstract: A metallocene compound of a metal M of group 4 in the table of elements, comprising a cyclopentadienyl group and at least one oligomeric group R′ bonded to M, having the following formula (II):

Abstract: An olefin polymerization pre-catalyst, an activated catalyst and a process for preparing the catalysts are described herein.

Abstract: The present invention relates to the use of thermally triggered compounds that when used with a polymerization catalyst in a polymerization process results in the controllable generation of one or more catalyst inhibitors that renders the polymerization catalyst substantially or completely inactive.

Abstract: A novel family of olefin polymerization catalysts comprising three-membered titanacarbocycles is described and illustrated. The titanacarbocycles can be readily synthesized by utilizing di-n-butyltitanium dichloride or di-t-butyltitanium dichloride at −78° C. in alkane, cycloalkane, or aromatic hydrocarbon media. These catalysts exhibit sufficient stability after their preparation that they undergo a remarkable, unprecedented reaction whereby the titanium dichloride moiety is efficiently transferred to a substrate like diphenylacetylene, ethylene, or similar compounds in order to generate the three-membered titanacarbocycles.

Abstract: Processes of producing fluorided catalyst compounds and process of producing polyolefins using these catalyst compounds are disclosed. An embodiment of the process includes contacting a nitrogenous metallocene compound with a fluoriding agent, which preferably includes a fluorided anhydrous acid, for a time sufficient to form a fluorided metallocene catalyst compound.

Abstract: Ethylene based polymers having high molecular weights can be obtained in high yields at temperatures of industrial interest, by carrying out the polymerization reaction in the presence of catalysts comprising silicon bridged metallocenes having a particular ligand system containing a heteroatom.

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: Provided is a catalyst for the polymerisation of olefins of general formula:

Abstract: Substantially linear olefin polymers having a melt flow ratio, I10/I2, ≧5.63, a molecular weight distribution, Mw/Mn, defined by the equation: Mw/Mn≦(I10/I2)−463, and a critical shear stress at onset of gross melt fracture of greater than about 4×106 dyne/cm2 and their method of manufacture are disclosed. The substantially linear olefin polymers preferably have at least about 0.01 long chain branches/1000 carbons and a molecular weight distribution from about 1.5 to about 2.5. The new polymers have improved processability over conventional olefin polymers and are useful in producing fabricated articles such as fibers, films, and molded parts.

Abstract: A polymerization process and polymerization reactor are provided. For example, a polymerization process is described, including passing a feed stream including liquid and gas through a feed stream inlet disposed proximate an upflow polymerization reactor, passing the feed stream through a member configured to impart an angular velocity to the feed stream and entrain the liquid in the gas, and contacting the feed stream with a catalyst to polymerize the feed stream.

Abstract: A liquid polymer suitable for use as a lubricant base oil is produced by polymerizing ethylene and at least one alpha-olefin using a metallocene catalyst to provide a polymer which is then isomerized and hydrogenated to produce the liquid polymer.

Abstract: The invention relates to polymeric phosphinic acids and their salts of the formula (I) in which X is hydrogen or a 1/m metal of valency m, R1 and R2 are identical or different and are hydrogen, a carboxyl group, a carboxylic acid derivative, an unsubstituted or substituted alkyl group having 1 to 10 carbon atoms, phenyl, benzyl or alkyl-substituted aromatics, R3 and R4 are identical or different and are hydrogen or a vinyl group of the formula (VI) —CR1═CHR2  (VI) in which R1 and R2 have the abovementioned meaning, and {overscore (u)} is the average number of monomer units. The invention also relates to a process for the preparation of the abovementioned compounds and their use.

Abstract: Use of isotactic polypropylene homopolymers or copolymers in processes in which the polypropylene solidifies from a melt, wherein for enhanced speed of solidification of the polypropylene the polypropylene has a melt temperature and a crystallisation temperature not more than 50° C. less than the melt temperature resulting from the polypropylene having been produced using a metallocene catalyst component having the general formula: R″(CpR1R2R3)(Cp′Rn′)MQ2. Cp and Cp′ are a substituted cyclopentadienyl ring, and a sybstituted or unsubstituted fluorenyl ring, respectively. R″ is a structural bridge; R1 is a substituent on the cyclopentadienyl ring distal to the bridge. The distal substituent comprises a bulky group of the formula XR*a; X is chosen from Group IVA. M is a Group IVB transition metal or vanadium and each Q is hydrocarbyl having 1 to 20 carbon atoms or is a halogen.

Abstract: A catalyst system useful for polymerizing olefins is disclosed. The catalyst system comprises an activator and an organometallic complex that incorporates a Group 3 to 10 transition metal and at least one chelating, dianionic triquinane ligand. The cis,syn,cis-triquinane framework is generated in three high-yield steps from inexpensive starting materials, and with heat and light as the only reagents. By modifying substituents on the triquinane ligand, polyolefin makers can control catalyst activity, comonomer incorporation, and polymer properties.

Abstract: A catalyst obtained by contacting a transition metal compound (A) of the general formula [1]: [LpXoCpjM(N2)nM′XmLl]X′k  [1], wherein M and M′ independently represent a transition metal of Group 3 to 10; X independently represents a hydrogen atom, halogen atom, a specific hydrocarbon group or the like; Cp is a cyclopentadienyl group; L represents a group which bonds to M or M′ by lone pair of electrons or a &pgr; electron; X′ represents a counter anion; k, l, m, o and p each independently represent an integer of 0 to 5; j represents an integer of 0 to 2; n+o+p+j≦6; n represents an integer of 1 to 3; and n+l+m≦6, with an organoaluminum, and an aluminoxane and/or boron compound, or with an aluminoxane and/or boron compound, and a process for producing an addition polymerization with the catalyst.

Abstract: A salt-like chemical compound of the formula (I),

Abstract: A polymerization process is provided. For example, a polymerization process is described, including contacting olefin monomers with a supported metallocene catalyst to polymerize the olefin monomers and form a product mixture that includes polyolefins macromers or polymers, unreacted or partially reacted olefin monomers, alcohols and organohalides. The polymerization process further includes removing a portion of the product mixture to form a recycle stream and passing the recycle stream through a removal device comprising zeolite particles having pore size of from 6 to 16 Å to transfer at least a portion of the alcohols and organohalides from the recycle stream to the removal device providing a purified recycle stream having alcohols and organohalides in an amount of 1 ppm or less. The polymerization process may further include contacting at least a portion of the purified recycle stream with the supported metallocene catalyst to form polyolefins.

Abstract: A polymerization process and a catalyst delivery system are provided. For example, a polymerization process is described, including providing a conduit having a catalyst inlet, a first propylene stream inlet located downstream of the catalyst inlet, and a second propylene stream inlet located downstream of the first propylene stream inlet, the conduit being operably connected to a polymerization vessel, introducing a catalyst to the conduit through the catalyst inlet, and passing the catalyst through the conduit to the polymerization vessel. The process may further include introducing a first propylene stream to the conduit to provide a mixed catalyst stream downstream of the catalyst inlet. The process may additionally include stopping the flow of the catalyst passing through the conduit, introducing a second propylene stream to the conduit through the second propylene stream inlet, removing a section of the conduit, and replacing the removed section of the conduit with a different conduit section.

Abstract: The present invention relates to a process for preparing homopolymers, copolymers and/or block copolymers of 1-olefins by living polymerization, to the use of the homopolymers, copolymers and/or block copolymers obtained for producing high-value materials and to the polymers formed from these homopolymers and/or block copolymers.

Abstract: A process for the preparation of a poly(&agr;-olefin) copolymer is disclosed wherein the process comprises polymerizing at least one &agr;-olefin, and at least one bulky olefin, in the presence of hydrogen and a catalytically effective amount of catalyst comprising the product obtained by combining a metallocene procatalyst with a cocatalyst, ligand (Cp2R2p) and bridging group R3 contains at least two bulky groups.

Abstract: A catalyst system useful for polymerizing olefins is disclosed. The catalyst system includes an organometallic complex that incorporates a Group 3 to 10 transition metal and an anionic, polycyclic, convex ligand. Molecular modeling results indicate that the complexes, when combined with an activator, should actively polymerize olefins. The convex ligand uniquely stabilizes the active site while simultaneously minimizing steric interference. Calculations predict that complexes based on ligands with a high curvature index will have favorable reactivities with olefin monomers compared with similar complexes that incorporate Cp-like ligands.

Abstract: The present invention relates to compounds in which a transition metal is complexed by at least two ligand systems and at least two of the systems are reversibly joined to one another by at least one bridge comprising a donor and an acceptor, wherein at least one fluorenyl ligand is present and at least one substituent on the acceptor group is an alkyl or aryl radical. The invention further relates to the use of these compounds having a donor-acceptor interaction as polymerization catalysts for preparing high molecular weight elastomers.

Abstract: There is provided a process for producing an olefin polymer, which comprises a step of polymerizing an olefin in a gas phase in the presence of a homogeneous solid catalyst having a content of particles having a particle size of not more than 180 &mgr;m of not more than 15% by weight based on 100% by weight of the total weight of the homogeneous solid catalyst.

Abstract: A process is disclosed for the preparation of a poly(&agr;-olefin) polymer wherein the process comprises polymerizing at least one &agr;-olefin in the presence of hydrogen and a catalytically effective amount of catalyst comprising the product obtained by combining a metallocene catalyst with a cocatalyst, the metallocene catalyst being at least one meso compound of general formula: wherein: A1 and A2 are independently selected from the group consisting of mononuclear and polynuclear hydrocarbons; M1 is a metal from group IVb, Vb, or VIb of the Periodic Table; R1 and R2 are independently selected from the group consisting of hydrogen, C1-C10 alkyl, C1-C10-alkoxy, C6-C10 aryl, C6-C10 aryloxy, C2-C10 alkenyl, C7-C40 arylalkyl, C7-C40 alkylaryl, C8-C40 arylalkenyl and halogen; R7 is selected from the group consisting of: ═BR11, ═AlR11, —Ge—, —Sn—, —O—, —S—, ═SO, ═SO2, ═NR11, ═CO, ═PR11 and &

Abstract: The present invention relates to a process for the copolymerization 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.