Patent ID: 8071700
Filing Date: 2011-12-06
Classification: C07F,C08F,Y10S

Abstract:
1. A catalytic system for the copolymerization of at least two olefins, comprising a metallocene complex of a lanthanide and a cocatalyst chosen from the group consisting of an alkylmagnesium, an alkyllithium, and a mixture of an alkyllithium and of an alkylaluminium, wherein the complex is a borohydride metallocene complex of a lanthanide corresponding to the following formula B: where Ln is a lanthanide having an atomic number of between 57 and 71 inclusive, where, in the formula B, a ligand composed of two groups Cp where L represents an alkali metal chosen from the group consisting of lithium, sodium and potassium, where N represents a molecule of a complexing solvent, where x is an integral or non-integral number which is greater than 0, where y is an integer which is equal to or greater than 0 and where p is an integer which is equal to 1 or 2.