METAL COMPLEXES COMPRISING A 2,6-DIACYLPYRIDINE-LIGAND AND THEIR USE IN THE POLYMERIZATION OF ETHYLENE

摘要

Organometallic complex having the formula (IAP)M(X)n which can be used for t he formation of catalytic systems wherein: M is a metal selected from transitio n metals and lanthanides, in oxidation state "s" positive and different from zero; each X is independently a group of an anionic nature bound to the meta l as an anion in an ionic couple or with a covalent bond of the ".sigma." type ; "n" expresses the number of X groups sufficient for neutralizing the formal "+s" charge of the metal M, and (IAP) represents a neutral bond consisting o f a mono-imine of 2,6-diacylpyridine. Said complex is prepared with relatively simple methods and can be used, combined with a suitable co-catalyst, such a s for example, an aluminoxane, as catalyst in normal (co)polymerization processes of .alpha.-olefins, and especially ethylene.