Patent ID: 8106137

Claim:
A catalytic combination allowing the in situ generation of an active catalyst for the polymerization or copolymerization of alpha-olefins in the absence of any organic aluminum-containing compound, containing the following components A, B and C: component A which is a dichlorinated complex of titanium diamide having general formula I: in which R is a methyl group or an isopropyl group; component B which is a dialkylmagnesium whose reaction with component A in the absence of any organic aluminum-containing compound allows an alkylated component AA to be obtained of general formula II: in which R is a methyl group or an isopropyl group, and in which R′ and R″ are substituents; and, as activator of said alkylated component AA, component C which is tris-pentafluorophenylborane [B(C 6 F 5 ) 3 ].