METALLOCEN-TRÄGERKATALYSATOR FÜR DIE ALPHA- OLEFINEN-(CO)POLYMERISATION

A supported catalyst for the (co)polymerization of alpha-olefins is obtained by putting the following products in contact with each other: (A) a metallocene derivative of a metal selected from the group consisting of transition metals and lanthanides, which is in itself capable of promoting the polymerization of alpha-olefins in the presence of or also without suitable activators; (B) an active support containing magnesium, halogen, titanium and smaller quantities of tin; (C) an organometal derivative of aluminium of which at least 50% of the aluminium atoms are bound to at least one alkyl carbon atom. Components (A) and (B) are preferably interacted first to obtain a supported metallocene derivative, which is then put in contact with (C) to obtain the desired catalyst. Alternatively, (B) and (C) are interacted and subsequently put in contact with (A). This catalyst is capable of polymerizing olefins with an extremely high activity in the presence of relatively limited quantities of aluminiun, to produce linear polymers with a high average molecular weight and controlled particle size, having a particularly favourable combination of rheological and mechanical properties.