CATALYST FOR THE HETEROGENEOUS PHASE POLYMERISATION OF CONJUGATED DIENES AND OLEFINS, METHOD FOR OBTAINING SAME AND USE THEREOF

摘要

The invention relates to a catalyst for the heterogeneous phase polymerisation of conjugated dienes and olefins, comprising a pre-catalyst consisting of a mixture of metallocene hydride-aluminohydride compounds: (CpR<SUB>x</SUB>)T<SUB>y</SUB>(CpR'<SUB>z</SUB>)MHAIH<SUB>4</SUB> (I), [(CpR<SUB>x</SUB>)T<SUB>y</SUB>(CpR'<SUB>z</SUB>)MHAIH<SUB>4</SUB>]<SUB>2</SUB> (II), and [(CpR<SUB>x</SUB>)T<SUB>y</SUB>(CpR'<SUB>z</SUB>MH]<SUB>2</SUB>AIH<SUB>5</SUB> (III), in which M is a transition metal from group IV in the +4 oxidation state thereof; Cp is a cyclopentadienyl ring which may or may not be substituted with R or R' or a cyclopentadienyl ring in which two adjacent substituents are joined and form cycles in order to form saturated or unsaturated polycyclic cyclopentadienyl ligands; R or R' are substituents on the cyclopentadienyl rings and may be identical or different; "x" and "z" are integers between 0 and 5; T is a branched or linear acyclic or cyclic covalent bridging group which joins the (Cp) rings; and "y" is 0 or 1. The pre-catalyst is supported on a modified silica and is activated with a co-catalyst. The invention also relates to the method for obtaining the catalyst and to the use thereof in polymerisation reactions.