| abstract |
The invention relates to a catalyst system for the polymerization of olefins comprising a metal complex of formula CyLMD and an activating cocatalyst, wherein nM nis titanium, nCy nis a cyclopentadienyl-type ligand, nD nis a diene, nL nis a guanidinate-containing ligand of the formulan nwherein each A is independently selected from nitrogen or phosphorous and R, R 1 , R 2 and R 3 are independently selected from the group consisting of hydrogen, hydrocarbyl, silyl and germyl residues, substituted or not with one or more halogen, amido, phosphido, alkoxy, or aryloxy radicals, and the activating cocatalyst is a boron compound represented by the general formula BR 4 R 5 R 6 , wherein B is a boron atom in the trivalent valence state and R 4 , R 5 and R 6 are individually selected from the group consisting of halogen atom, hydrocarbyl, halogenated hydrocarbyl, substituted silyl, alkoxy or di-substituted amino residue. n The invention further relates to a process for the preparation of a polymer comprising at least one aliphatic or aromatic hydrocarbyl C 2-20 olefin wherein the at least one aliphatic or aromatic olefin is contacted with the catalyst system of the present invention. |