METHOD FOR POLYMERISING OLEFINS IN THE PRESENCE OF NICKEL COMPLEXES AND CORRESPONDING CATALYTIC SYSTEM

摘要

The invention concerns a system consisting of (A) at least one ligand of general formula (l) and (B) at least a nickel compound selected among nickel complexes with zero oxidation level; n-allyl nickels; and bis-allyl type nickel compounds (I) wherein E, E' = O, S; X, X' = P, As, Sb; R<1>, R'<1> = H, alkyl, aryl, arylalkyl, alkylaryl, halogen, OH, alkoxide (A), with R' = C1-C15 hydrocarbon radical; -SO3Y with Y = Li, Na, NH4<+>, NR''4<+> (R'' = C1-C15 hydrocarbon radical); R<2>, R'<2>, R<3>, R'<3>, R<4> and R'<4> = alkyl, arylalkyl; and R = divalent radical.