| abstract |
A process for polymerizing 1-butene, optionally with up to 30% by mol of ethylene, propylene or an alpha olefin of formula CH 2 ═CHT wherein T is a C 3 -C 10 alkyl group, in the presence of a catalyst system obtainable by contacting a metallocene compound of formula (I) Wherein M is an atom of a transition metal; X, is a hydrogen atom, a halogen atoms or a hydrocarbon group; R 1 , R 2 , R 5 , R 6 , R 7 , R 8 and R 9 are hydrogen atoms or hydrocarbon groups; with the proviso that at least one of R 6 or R 7 is a C 1 -C 20 alkyl group; R 3 and R 4 are C 1 -C 20 alkyl groups; and an alumoxane and/or a compound capable of forming an alkyl metallocene cation. |