BORANE ACTIVATED TITANIUM CATALYST SYSTEM COMPRISING GUANIDINE AND DIENE LIGANDS
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app pub date -
Mar 29, 2012
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Apr 1, 2011
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Abstract
The invention relates to a catalyst system for the polymerization of olefms comprising a metal complex of formula and an activating cocatalyst, wherein M is titanium, Cy is a cyclopentadienyl-type ligand, D is a diene, L is a guanidinate-containing ligand of the formula wherein each A is independently selected from nitrogen or phosphorous and R, R 1,R2 and R3 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 BR4R5R6, wherein B is a boron atom in the trivalent valence state and R4, R5 and R6 are individually selected from the group consisting of halogen atom, hydrocarbyl, halogenated hydrocarbyl, substituted silyl, alkoxy or di-substituted amino residue. The invention further relates to a process for the preparation of a polymer comprising at least one aliphatic or aromatic hydrocarbyl C2-20 olefin wherein the at least one aliphatic or aromatic olefm is contacted with the catalyst system of the present invention.
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