Patent ID: 6555632
Filing Date: 2003-04-29
Classification: C08F

Abstract:
A process for the (co)polymerisation of at least one olefin in the presence of a catalytic system comprising at least organoaluminiun compound of general formula AITTâ€²Tâ€³, in which T, Tâ€² and Tâ€³ each denote a radical which can optionally comprise oxygen, and at least one ionizing agent, and at least, one neutral halogenated metallocene selected from compounds of formula (Cp)a(Cpâ€²)bMXx, in which:CP denotes an unsaturated hydrocarbon radical selected from the group consisting of cyclopentadienyl, indenyl, and fluorenyl radicals and the substtitued derivatives thereof comprising a hydrocarbon radical comprising up to 10 carbon atoms, which is coordinated to the central atom M Cpâ€² denotes an unsaturated hydrocarbon radical selected from the group consisting of cyclopentadienyl, indenyl, and fluorenyl radicals and the substituted derivatives thereof comprising a hydrocarbon radical comprising up to 10 carbon atoms, which is coordinated to the central atom M, or a radical comprising an element selected from groups VA and VIA of the Periodic Table, the groups Cp and Cpâ€² being identical or different, and being able to be linked via a covalent bridge M denotes a transition metal selected from groups IIIB, IVB, VB and VIB of the Periodic Table a, b, and x denote integers such that (a+b+x)=m, x>1, and a and/or by bâ‰ 0 m denotes the valency of the transition metal M X denotes a halogen, wherein said (co)polymerization process comprises preparing a mixture of the organoaluminuin compound and of the neutral metallocene in at least one hydrocarbon diluent; contacting the olefin with this mixture; and adding the ionizing agent thereto.