Patent ID: 6380332
Filing Date: 2002-04-30
Classification: C08F,Y10S

Abstract:
A process for the preparation of a supported olefin polymerization catalyst composition, comprising a support, an organomettalic compound, a metallocene, and an aluminoxane comprising contacting a support comprising a solid compound which is one of pure aluminium oxide, a mixed aluminium oxide, an aluminum salt, a magnesium halide, or a C1-C8 alkoxy magnesium halide, in any order with at leasta) an organometallic compound of the general formula (1): R1MXvâˆ’1 wherein each R is the same or different and is a C1-C10 alkyl group; M is a metal of Group 1, 2, 12 or 13 of the Periodic Table; each X is the same or different and one of a halogen atom, a hydrogen atom, a hydroxyl radical or a C1-C8 hydrocarbyloxy group; 1 is 1, 2, or 3; v is the oxidation number of the metal M, b) a metallocene of the general formula (2): (CpY)mMâ€²Xâ€²nZo wherein each CpY is the same or different and is one of a mono- or polysubstituted, fused or non-fused, homo- or heterocyclic cyclopentadienyl, indenyl, tetrahydroindenyl, fluorenyl, or octahydrofluorenyl ligand, wherein said ligand is substituted at its cyclopentadienyl ring with at least one substituent Y which is an â€”ORâ€² radical, each Râ€² being the same or different and being one of a, a tri-C1-C8 hydrocarbylsilyl group or a tri-C1-C8 hydrocarbyloxy silyl group; Mâ€² is a transition metal of Group 4 of the Periodic Table and bound to the ligand CpY at least in an &eegr;5 bonding mode; each X; is the same or different and is one of a hydrogen atom, a halogen atom, a C1-C8 hydrobarbyl silyl group or two Xâ€² form a ring with each other; Z is a bridge atom or group between two CpY ligands or one CpY ligand and the transition metal Mâ€²; m is 1 or 2; o is 0 or 1; and n is 4âˆ’m if there is no bridge Z or Z is a bridge between two CpY ligands, or n is 4âˆ’mâˆ’o if Z is a bridge between on CpY ligand and the transition metal Mâ€², and c) an aluminoxane of one of the following formulas (3): wherein each Râ€³ and each Râ€²â€³ is the same or different and is a C2-C10 alkyl group; and p is an integer between 1 and 40, and recovering said supported olefin polymerization catalyst composition.