Abstract: Process for the preparation of an ethylene copolymer composition having a polydispersity index Mw/Mn of from 3 to 100, comprising a) feeding ethylene to at least one polymerization reactor; b) performing in the at least one polymerization reactor an oligomerization of ethylene in the presence of an oligomerization catalyst component (C) to produce comonomer; c) performing simultaneously in the at least one polymerization reactor polymerization reactions in the presence of catalyst components (A) and (B) producing, respectively, a first and a second polyethylene fraction, wherein the weight average molecular weight Mw of the first polyethylene fraction produced by catalyst component (A) is less than the Mw of the second polyethylene fraction produced by catalyst component (B) and the comonomer incorporation ability of catalyst component (B) is higher than the comonomer incorporation ability of catalyst component (A); and d) withdrawing the ethylene copolymer composition from the polymerization reactor.

Abstract: A novel gas phase polymerisation method is devised, for polymerisation of low and ultralow density polyethylene.

Abstract: An ethylene copolymer, a catalyst system suitable to prepare the ethylene copolymer, and a process to prepare such ethylene copolymer are described. The use of the ethylene copolymer as impact modifier in polyethylene and as compatibilizer in a polymer blend are also described. The ethylene copolymer has a density from 0.855 g/cm3 to 0.910 g/cm3, a polydispersity Mw/Mn lower than 3.5, comprises at least one first ethylene polymer component and at least one second ethylene polymer component having different comonomer contents so as to show at least two predetermined CRYSTAF peak temperatures.

Abstract: Polyethylene which comprises ethylene homopolymers and copolymers of ethylene with ?-olefins and has a molar mass distribution width Mw/Mn of from 6 to 100, a density of from 0.89 to 0.97 g/cm3, a weight average molar mass Mw of from 5000 g/mol to 700 000 g/mol and has from 0.01 to 20 branches/1000 carbon atoms and at least 0.5 vinyl groups/1000 carbon atoms, wherein the 5-50% by weight of the polyethylene having the lowest molar masses have a degree of branching of less than 10 branches/1000 carbon atoms and the 5-50% by weight of the polyethylene having the highest molar masses have a degree of branching of more than 2 branches/1000 carbon atoms, a process for its preparation, catalysts suitable for its preparation and also fibers, moldings, films or polymer blends in which this polyethylene is present.

Abstract: A method of controlling the polymer composition of an ethylene copolymer in a process for preparing ethylene copolymers by copolymerizing ethylene and at least one other olefin in the presence of a polymerization catalyst system comprising at least one late transition metal catalyst component (A) having a tridentate ligand which bears at least two ortho, ortho?-disubstituted aryl radicals, at least one Ziegler catalyst component (B), and at least one activating compound (C) by varying the polymerization temperature, a process for copolymerizing ethylene and at least one other olefin in the presence of such a polymerization catalyst system comprising utilizing the controlling method, a method for altering the polymer composition of an ethylene copolymer obtained by copolymerizing ethylene and at least one other olefin in the presence of such a polymerization catalyst system by varying the polymerization temperature and a method for transitioning from one ethylene copolymer grade to another by using the method

Abstract: The invention relates to a bimodal or multimodal polyethylene which comprises ethylene homopolymers and/or copolymers of ethylene with ?-olefins, has a polydispersity index Mw/Mn of the low molecular weight component of less than 10 and can be prepared using a polymerization catalyst based on a Ziegler component and a late transition metal component having a tridentate ligand which bears at least two ortho,ortho-disubstituted aryl radicals and also a catalyst system and a process for preparing the polyethylene and also fibers, moldings, films and polymer blends comprising this material.

Abstract: A method for transitioning from a Ziegler-Natta to a Phillips catalyst system for the olefin polymerization reaction in one reactor, preferably a gas phase reactor, is described. The method comprises the steps of a) discontinuing a first olefin polymerization reaction performed in the presence of the Ziegler-Natta catalyst system; b) performing a second olefin polymerization reaction in the presence of a further catalyst system comprising catalyst components (A) and (B) producing, respectively, a first and a second polyolefin fraction, wherein the Mw of the first polyolefin fraction is less than the Mw of the second polyolefin fraction and the initial activity of catalyst component (A) exceeds the initial activity of catalyst component (B); and c) performing a third olefin polymerization reaction the presence of the Phillips catalyst system.

Abstract: The present invention relates to non-symmetrical organometallic transition metal compounds of the compound of the formula (I) where R8 and R9 are identical or different and each an substituted or unsubstituted organic radical having from 1 to 40 carbon atoms, catalyst systems comprising at least one of the organometallic transition metal compounds of the present invention and a process for preparing polyolefins by polymerization or copolymerization of at least one olefin in the presence of one of the catalyst systems of the present invention.

Abstract: New plastomer material for use in automotive parts such as bumpers is devised here, which is a novel polyethylene produced by a gas phase process.

Abstract: The present invention relates to a new hybrid catalyst system for the polymerization of olefins and to a polymerization process carried out in the presence of said catalyst. The new hybrid catalyst system comprises a tridendate iron compound and a zirconocene having a bridge of at least three carbon atoms connecting two indenyl ligands.

Abstract: The invention refers to a process for preparing a supported catalyst system for the polymerization of olefins comprising at least one active catalyst component on a support, the process comprising A) impregnating a dry porous support component with a mixture comprising at least one precatalyst, at least one cocatalyst, and a first solvent, such that the total volume of the mixture is from 0.8 to 2.0 times the total pore volume of the support component, and B) thereafter, adding a second solvent in an amount of more than 1.5 times the total pore volume of the support component. The invention refers further to a catalyst system made by this process and the use of this catalyst system for polymerization or copolymerization of olefins.

Abstract: A polymer filament or fiber comprising a polyethylene material (I) having the following features: a) a density of 0.900 g/cm3 or higher; b) a MI21 value of 25 g/10 min.; c) a MFR value from 25 to 60; the said fiber being stretched by drawing with a draw ratio from 1.5 to 10.

Abstract: Process for the preparation of an ethylene copolymer composition having a polydispersity index Mw/Mn of from 3 to 100, comprising a) feeding ethylene to at least one polymerization reactor; b) performing in the at least one polymerization reactor an oligomerization of ethylene in the presence of an oligomerization catalyst component (C) to produce comonomer; c) performing simultaneously in the at least one polymerization reactor polymerization reactions in the presence of catalyst components (A) and (B) producing, respectively, a first and a second polyethylene fraction, wherein the weight average molecular weight Mw of the first polyethylene fraction produced by catalyst component (A) is less than the Mw of the second polyethylene fraction produced by catalyst component (B) and the comonomer incorporation ability of catalyst component (B) is higher than the comonomer incorporation ability of catalyst component (A); and d) withdrawing the ethylene copolymer composition from the polymerization reactor.

Abstract: A catalyst system useful for polymerizing olefins is disclosed. The catalyst system comprises an activator and a Group 4 metal complex. The complex incorporates a dianionic, tridentate heterocyclic-8-anilinoquinoline ligand. In one aspect, a supported catalyst system is prepared by first combining a boron compound having Lewis acidity with excess alumoxane to produce an activator mixture, followed by combining the activator mixture with a support and the dianionic, tridentate Group 4 metal complex. The Group 4 metal complexes are easy to synthesize, support, and activate, and they enable facile production of high-molecular-weight polyolefins.

Abstract: A catalyst system obtainable with a process comprising the following steps: i) contacting a group 4 metal compound of formula (I) MX4??(I) wherein M is a metal of group 4 of the periodic table of the element, and X is a halogen atom or an organic radical; with a compound of formula (II) ii) adding to the reaction mixture of step i) one or more boron compounds having Lewis acidity wherein the molar ratio between the boron compound and the compound of formula (I) ranges from 0.9 to 100; iii) adding the reaction mixture obtained in step ii) to a silica support. with the proviso that the catalyst system is not treated with alumoxanes.

Abstract: A novel UHMW polyethylene material, which is displaying excellent abrasion resistance amongst other properties, is devised.

Abstract: Process for the polymerization of olefins at temperatures of from ?20 to 200° C. and pressures of from 0.1 to 20 MPa in the presence of a polymerization catalyst and an antistatic agent, wherein the antistatic agent is an antistatically acting composition comprising a polysulfone copolymer, a polymeric compound comprising basic nitrogen atoms, an oil-soluble sulfonic acid and optionally a solvent and the polysulfone copolymer, the polymeric compound comprising basic nitrogen atoms and the oil-soluble sulfonic acid constitute together at least 1 wt. % of the antistatically acting composition, and wherein the antistatically acting composition, when contacted as solution or suspension in heptane, wherein the solution or suspension has a concentration of about 80 g of the antistatically acting composition per liter of heptane, with a 2 M solution of triethylaluminum in heptane at 0° C., generates less than 5 cm3, measured at 23° C.

Abstract: The present invention refers to a process for the preparation of supported catalysts for the polymerization of olefins comprising at least a late transition metal complex, wherein the process comprises two steps. In the first step a catalytically active component comprising at least one late transition metal complex, optionally in the presence of one or more cocatalysts is mixed with a support; and in the second step the obtained mixture is treated at a reduced pressure under a flow of inert gas at a temperature equal to or below 40° C. to obtain a supported catalyst. The method is especially useful for the preparation of dual supported catalysts, useful in the gas-phase polymerization of olefins.

Abstract: A method for transitioning from a first to a second catalyst system for the olefin polymerization reaction in one reactor, wherein the first catalyst system is incompatible with the second catalyst system, is described. The method comprises the steps of a) discontinuing a first olefin polymerization reaction performed in the presence of the first catalyst system; and b) performing a second olefin polymerization reaction in the presence of the second catalyst system comprising catalyst components (A) and (B) producing, respectively, a first and a second polyolefin fraction, wherein the Mw of the first polyolefin fraction is less than the Mw of the second polyolefin fraction and the initial activity of catalyst component (A) exceeds the initial activity of catalyst component (B).

Abstract: Process for the preparation of monoimine compounds, wherein a dicarbonyl compound is reacted in an aliphatic, non-aromatic solvent with aniline. Monoimine compounds having electron-withdrawing substituents in the ortho position and unsymmetric bis(imino) compounds and unsymmetric iron complexes prepared therefrom and the use thereof in the polymerization of olefins.