| abstract |
A process for producing a 1-butane polymer comprising the step of polymerizing 1-butene in the presence of a catalyst system obtainable by contacting: a) at least a metallocene compound of formula (Ia) in the meso or meso-like form, wherein M is an atom of a transition metal p is an integer from 0 to 3, X, same or different, is a hydrogen atom, a halogen atom, or a hydrocarbon group. L is a divalent C1-C40 hydrocarbon radical R1 and R2, equal to or different from each other, are C1-C40 hydrocarbon radicals; T, equal to or different from each other, is a moiety of formula (IIa), (IIb) or (IIc), wherein R3 and R5 are a C1-C40 hydrocarbon radical; R4 and R6, equal to or different from each other, are hydrogen atoms or C1-C40 hydrocarbon radicals and R7 and R8, equal to or different from each other, arc hydrogen atoms or C1-C40 hydrocarbon radicals; b) at least a metallocene compound of formula (Ib) in the racemic (rac) or racemic - like form; c) an alumoxane or a compound capable of forming an alkyl metallocenc cation. |