A process for preparing 1-butene polymers comprising polymerizing 1-butene and optionally ethylene, propylene or higher alpha-olefin, in the presence of a catalyst system obtainable by contacting:
a) metallocene compound of formula (I):
wherein: M is 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 is a C1-C40 hydrocarbon radical; T1, is a moiety of formula (IIa) or (IIb):
wherein R2 and R3, are C1-C40 hydrocarbon radicals or they can form together a C3-C7-membered ring; R4 is C1-C40 hydrocarbon radicals; T2 and T3, are a moiety of formula (IIIa) or (IIIb):
wherein R6 and R7, equal to or different from each other, are hydrogen atoms or C1-C40 hydrocarbon radicals; R5 is a hydrogen atom or a C1-C40 hydrocarbon radicals; with the proviso that if T1 is a moiety of formula (IIa) at least one between T2 and T3 is a moiety of formula (IIIb), and if T1 is a moiety of formula (IIb) at least one between T2 and T3 is a moiety of formula (IIIa); and
b) at least an alumoxane or a compound able to form an alkylmetallocene cation.
一种制备1-
丁烯聚合物的方法,包括在催化剂体系的存在下聚合1-
丁烯和可选的
乙烯、
丙烯或更高的α-烯烃,所述催化剂体系可通过接触以下化合物而获得:a) 公式(I)的
金属茂化合物:其中:M为过渡
金属;p为0至3的整数;X,相同或不同,为氢原子、卤素原子或烃基;L为二价的C1-C40烃基;R1为C1-C40烃基;T1为公式(IIa)或(IIb)的基团:其中R2和R3为C1-C40烃基,或者它们可以一起形成一个C3-C7环;R4为C1-C40烃基;T2和T3为公式(IIIa)或(IIIb)的基团:其中R6和R7相等或不同,为氢原子或C1-C40烃基;R5为氢原子或C1-C40烃基;但前提是如果T1是公式(IIa)的基团,则T2和T3中至少有一个是公式(IIIb)的基团,如果T1是公式(IIb)的基团,则T2和T3中至少有一个是公式(IIIa)的基团;和b) 至少一种铝氧烷或能够形成烷基茂阳离子的化合物。