Abstract: A catalyst composition is provided, which is prepared by contacting a cycloalkadienyl compound, a transition metal amide of the formula M(NMe2)mXn, an aluminoxane, and optionally a solid support at a temperature of 0 to 100° C.

Abstract: Process for the preparation of EP(D)M elastomeric copolymers in liquid phase, preferably in suspension of a liquid monomer, in the presence of a catalyst essentially consisting of a Vanadium compound, a cocatalyst essentially consisting of an Aluminium trialkyl, and optionally an activator, characterized in that the Aluminium trialkyl is essentially Aluminium trimethyl and the Vanadium compound, as such or prepolymerized, is selected from: (a) compounds having general formula (I) VO(L)n(X)m wherein n is an integer from 1 to 3 and m is from zero to 2, n+m being equal to 2 or 3; (b) compounds having general formula (II) V(L)p(X)q wherein p is an integer from 1 to 4, q is from 0 to 3, the sum of p+q being equal to 3 or 4; wherein L is a bidentate ligand deriving from a 1,3-diketone and X is a halogen, preferably Chlorine.

Abstract: A single-site olefin polymerization catalyst and method of making it are disclosed. The catalyst comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10 transition or lanthanide metal, M, and at least one homoaromatic anionic ligand that is &pgr;-bonded to M. Molecular modeling results indicate that single-site catalysts based on homoaromatic anionic ligands (e.g., bicyclo[3.2.1]octa-2,6-dienyl) will rival the performance of catalysts based on cyclopentadienyl and substituted cyclopentadienyl ligands.

Abstract: Process for the gas-phase polymerization of olefins of the formula CH2═CHR where R is hydrogen or an alkyl or aryl radical with 1 to 8 carbon atoms carried out in one or more reactors having a fluidized or mechanically agitated bed, using a catalyst obtained by reaction of a titanium halide or haloalcoholate and optionally an electron-donor compound supported on an active Mg-dihalide with an Al-trialkyl compound and optionally an electron-donor compound, comprising the steps of: a) contacting the catalyst components in the absence of polymerizable olefin or optionally in the presence of said olefin in an amount to from up to 3 g per g of solid catalyst component; b) prepolymerizing propylene or mixtures of propylene with ethylene or an alpha-olefin to form a propylene polymer having an insolubility in xylene of at least 60% by weight, in an amount of from 5 g of polymer per g of solid catalyst component to 10% by weight of the final catalyst yield; and c) polymerizing one or more CH2═CHR olefins

Abstract: A process for the continuous gas fluidised bed polymerisation of olefins, especially ethylene, propylene, or mixtures of these with other alpha olefins, wherein the monomer containing recycle gas employed to fluidise the bed is passed through a separator. The separator is charged with and maintained at least partially filled with liquid. Entrained catalyst and/or polymer particles are separated from the recycle gas in the separator and these separated particles are maintained in a suspended state in the liquid in the separator. The recycle stream can be cooled to condense out at least some liquid hydrocarbon; the condensed liquid, which can be a monomer or an inert liquid, is separated from the recycle gas in the separator and is fed directly to the bed to produce cooling by latent heat of evaporation. The process reduces fouling of the separator.

Abstract: A procatalyst and a process for the preparation of a multimodal ethylene homopolymer or copolymer by gas-phase polymerisation is described. The procatalyst used in the process is prepared by: a) contacting the support, preferably silica with a halogenating agent, preferably ethyl aluminium dichloride to obtain a first reaction product, b) contacting the first reaction product with a compound or mixture containing hydrocarbyl and one or more of hydrocarbyloxy, monoalkylamido, dialkylamido, carboxylato and alkoxymethoxy groups linked to magnesium, thereby to obtain a second reaction product (the procatalyst precursor), and c) contacting the second reaction product with a titanium compound, preferably TiCl4. In step a) the molar ratio of the alkyl metal chloride to the surface hydroxyls of the inorganic oxide is preferably between 1:1 and 10:1. In step b) the atomic ratio of the magnesium to the chlorine of the alkyl metal chloride of step a) preferably is between 1:1.5 to 1:2.5.

Abstract: The invention comprises a catalyst support containing an &agr;-olefin polymer which is in the form of particles of mean size from 5 to 350 &mgr;m in which the pore volume generated by the pores of radius from 1,000 to 75,000 Å is at least 0.2 cm3/g. A catalyst usable for the polymerization of &agr;-olefins, including a compound containing at least one transition metal belonging to groups IIIb, IVb, IVb and VIb of the Periodic Table, bound in or on this support, is also described.

Abstract: Ethylene copolymers with alpha-olefins utilizable as additives to increase the properties of middle distillates at low temperatures, obtainable by polymerization in the presence of catalysts comprising the reaction product between: 1) a bis-cyclopentadienyl derivative having the general formula: (Cp1Cp2)—M—(L2L3) containing groups with oxygen bound to the transition metal, wherein M is a metal from the IIIb group to the IIb group or of the lanthanides series of the periodic table of the elements; 2) a co-catalyst chosen from alumoxanes or boranes.

Abstract: The present invention is a process of preparing copolymers of vinyl aromatic and olefinic monomers wherein the polymerization is carried out in a dispersion in the presence of a metallocene catalyst and a dispersion aid. The dispersion aid is a styrene-diene two-block copolymer or a styrene-diene three-block copolymer. The resultant polymer is useful as a fiber, film or molding.

Abstract: A continuous process for the manufacture of olefin polymers in a continuous gas phase polymerization reaction wherein monomer, after passage through the fluidized bed, is cooled to a temperature below its dew point to produce a mixture of cold gas and liquid. All or part of the cold gas is introduced into the bottom of the reactor to serve as the fluidizing gas stream for the fluidized bed. Cold liquid separated from the mixture is warmed to form a heated fluid by passing in indirect heat exchange relation with the fluidized bed and the heated fluid is then injected directly into the bed; combined with the fluidizing gas stream; sprayed on top of the bed or combined with gaseous monomer removed from the fluidized bed for cooling.

Abstract: The present invention relates to a process to prepare an olefin using a transition metal compound of the formula I as a catalyst component where M1 is a metal of group IIIb, IVb or Vb of the Periodic Table of the Elements, R1, R2, R3 and R4 are identical or different and are each a hydrogen atom or a substituent, R5 are identical or different and are a substituent, Y are identical or different and are each a hydrogen atom, a C1-C40-hydrocarbon-containing group, an OH group, a halogen atom or an NR52 group, where R5 are identical or different and are each a halogen atom, a C1-C10-alkyl group or a C6-C10-aryl group, k is an integer which corresponds to the valence of the transition metal atom M1 minus two and if Y is a butadiene unit, k is 1, A is a bridge.

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: The present invention is directed to a process of preparing a novel supported Ziegler-Natta catalyst useful for the polymerization of &agr;-olefins. More specifically, the supported Ziegler-Natta catalyst of the present invention comprises a particulate functionalized copolymeric support, at least one organometallic compound or complex and at least one transition metal compound. A novel method of preparing the particulate functionalized copolymeric support of the instant invention is also provided.

Abstract: Process for the polymerization of olefins using a catalytic system comprising a solid precursor containing at least one neutral halogenated metallocene derived from a transition metal and at least one ionizing agent, and an organometallic compound derived from a metal chosen from groups IA, IIA, IIB, IIIA, and IVA of the Periodic Table.

Abstract: The invention provides a process for commercial production of syndiotactic polyolefins using a metallocene catalyst supported on silica treated with MAO. The invention includes contacting the supported metallocene catalyst with an aluminum alkyl and aging the catalyst prior to polymerization. In addition, the catalyst is prepolymerized in a tubular reactor prior to being introduced into the polymerization reaction zone. The treated silica is produced by removing water to a level of 0.5-1.08%, slurrying in a nonpolar solvent, adding an alumoxane, heating to reflux, cooling the slurry, and separating the solid product.

Abstract: A catalyst composition for preparing high-syndiotacticity polystyrene polymers which comprises: (a) a titanium complex represented by the following formula of TiR′1R′2R′3R′4 or TiR′1R′2R′3, wherein R′1, R′2, R′3, and R′4 are, independently, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group, a hydrogen atom, or a halogen atom; (b) a cyclopentadienyl complex represented by the following formula: wherein R1-R13 are, independently, alkyl group, aryl group, silyl group, halogen atom, or hydrogen atom; Ra and Rb are, independently, alkyl group, aryl group, alkoxy, aryloxy group, cyclopentadienyl group, hydrogen atom, or halogen atom; and Xa is a Group IIA element and Xb is a Group IIIA element.

Abstract: Disclosed is a liner film for bulk container, which comprises a polyethylene (A) prepared by the use of a single site olefin polymerization catalyst such as a metallocene catalyst, said polyethylene (A) having a density of 0.920 to 0.940 g/cm3, MFR of 0.1 to 3.0 g/10 min and a melting point of 115 to 135° C. When the film is heat-sealed, its sealed portion preferably has a tensile strength at break (Ts) of 2.0 to 4.0 kg/15 mm and a tensile elongation at break (EL) of 150 to 600%. The liner film for bulk container has the advantages: the film can be made lightweight by decreasing the film thickness; the film shows such a high heat-sealing strength that the heat-sealed portion is not broken even if no adhesive tape is attached thereto; and a bulk container liner formed from the film can be filled with a content of a higher temperature than the conventional temperature. Also disclosed is a bulk container liner shaping the above film into a bag.

Abstract: A process for producing polyethylene having impact resistance, the process comprising polymerizing ethylene, or copolymerizing ethylene and an alpha-olefinic comonomer comprising from 3 to 10 carbon atoms, in the presence of a chemically reduced chromium-based catalyst containing in a support thereof from 2 to 3 wt % of titanium, based on the weight of the catalyst. The invention also provides a chromium-based catalyst for the production of polyethylene by polymerizing ethylene or copolymerizing ethylene and an alpha-olefinic comonomer comprising from 3 to 10 carbon atoms, the catalyst being chemically reduced and containing in a support from 2 to 3 wt % of titanium, based on the weight of the catalyst.

Abstract: A process to produce a polymer is provided. The process comprises polymerizing monomers wherein the monomers comprise ethylene, 1-butene, and 1-hexene. The total amount of 1-butene and 1-hexene in the polymer is less than 10 mole percent of the polymer, and the mole ratio of 1-butene to 1-hexene is in a range of 4:1 to 9:1. The polymerizing is conducted in a loop reactor under slurry polymerization conditions with a diluent that comprises isobutane, where the isobutane is a majority of the diluent by weight. A catalyst that comprises titanium, magnesium, and halide and a cocatalyst that comprises organoaluminum are utilized. The polymerizing is conducted at a temperature from 73° C. to 85° C. The polymer produced has a heterogeneity index (Mw/Mn) from about 3 to about 7, a density from about 0.915 to about 0.925 grams per cubic centimeter, a melt index from about 0.25 to about 3.5 grams per ten minutes, and a shear ratio from about 24 to about 30.

Abstract: Catalysts for the polymerization of olefins comprise the product of the reaction between: (A) a titanium, zirconium or hafnium product with substituted cyclopentadiene ligands, (B) a mixture of two organometallic aluminium compounds, with at least one of the groups bound to the aluminium being other than a linear alkyl, and (C) water. When used in the polymerization of olefins, these catalysts show higher activities, at short residence times, than corresponding catalysts obtained from the individual components of the above-mentioned mixtures of aluminium compounds.