Patent ID: 6743871
Filing Date: 2004-06-01
Classification: C08F

Abstract:
A process for manufacturing ethylene homopolymers or ethylene copolymers comprising at least 90 mol % of units derived from ethylene, in which process ethylene, and optionally other monomers, are brought into contact, under polymerizing conditions, with a catalytic system comprising:(a) a catalytic solid comprising a metallocene of a transition metal of Groups 4 to 6 of the Periodic Table, which contains at least one cyclopentadiene ligand, which may be substituted, deposited on a support; (b) at least one organoaluminum compound chosen from compounds satisfying the general formula (1) AlTx(Yâ€²)yXâ€²zâ€ƒâ€ƒ(1) in which:T is a hydrocarbon group containing from 1 to 30 carbon atoms, Yâ€² is a group chosen from â€”ORâ€², â€”SRâ€² and NRâ€²Râ€³, where Râ€² and Râ€³ represent, independently, a hydrocarbon group containing from 1 to 30 carbon atoms, Xâ€² is a halogen atom, x is a number satisfying the condition 0y is a number satisfying the condition 0&lE;y<3, z is a number satisfying the conditions 0&lE;z<3 and x+y+z=3; and (c) at least one ionic antistatic agent selected from the group consisting of quaternary ammonium represented by the general formula A1A2A3A4NX1, in which A1, A2, A3 and A4 represent, independently, a hydrocarbon group containing from 1 to 35 carbon atoms and a least one of A1, A2, A3 and A4 is a hydrocarbon group containing from 6 to 35 carbon atoms, and X1 is a halogen atom and sulfonic acids having at least one unsubstituted or substitute hydrocarbon group containing from 16 to 35 carbon atoms.