Patent ID: 6858558

Claim:
In a catalyst component for the polymerization of an α-olefin comprising a compound of formula CyLMZ p , wherein M is a group 4-6 metal, Cy is a cyclic ligand, having a delocalized π-bond with M, L is a ketimide ligand, Z is an anionic ligand, and p is the number of anionic ligands the improvement wherein L is an 1,3-diaza-2-imino heterocyclic ligand of wherein: each Y is CRR 1 , C═CRR 1 , C═NR, SiRR 1 , C═O,NR, PR, O, or S each X is CR, N, or P, R and R 1 are independently selected from hydrogen, hydrocarbyl, silyl or germyl residues, being substituted or not with one or more halogen, amido, phosphido, alkoxy, or aryloxy radicals, k=0, 1, 2, 3 m=0, 1, 2, 3 n=0, 1, 2, 3, provided that k+m+n>0, each Z is independently an anionic ligand selected from halide, hydride, substituted or unsubstituted hydrocarbyl, alkoxide, aryloxide, amide or phosphide; or both Z together form an alkylidene or an arylene residue.