Catalyst system for producing ethylene copolymers in a high temperature solution process, the catalyst system comprising
(i) a metallocene complex of formula (I)
wherein
M is Hf or Zr
X is a sigma ligand
L is a bridge of the formula -SiR72-, wherein each R7 is independently a C1-C20-hydrocarbyl, tri(C1-C20-alkyl)silyl, C6-C20-aryl, C7-C20-arylalkyl or C7-C20-alkylaryl
R1 and R1' are the same or can be different and can be a linear or branched C1-C6-alkyl group
n is 0, 1 or 2
R2 and R2' are the same or can be different and are a CH2-R8 group, with R8 being H or linear or branched C1-C6-alkyl group
R5 and R5' are the same or are different and can be a linear or branched C1-C6-alkyl group or a OR group, wherein R is a C1-C6-alkyl group
R6 and R6' are the same or are different and can be a C(R9)3 group, with R9 being the same or different and R9 can be H or a linear or branched C1-C6-alkyl group
or R5 and R6 and/or R5' and R6' taken together form an unsubstituted 4-7 membered ring condensed to the benzene ring of the indenyl moiety,
with the proviso that if R5 and R6 as well as R5' and R6' taken together form an unsubstituted 5 membered ring condensed to the benzene ring of the indenyl moiety then R2 and R2' are not a CH3 group
(ii) an aluminoxane cocatalyst and
(iii) optionally a boron containing cocatalyst
在高温溶液过程中生产
乙烯共聚物的催化剂系统,该催化剂系统包括(i)式(I)的
金属环烯复合物,其中M为Hf或Zr,X为一个σ
配体,L为式-SiR7 2-的桥,其中每个R7独立地是C1-C20-烃基,三(C1-C20-烷基)
硅基,C6-C20-芳基,C7-C20-芳基烷基或C7-C20-烷基芳基,R1和R1'相同或不同,可以是线性或支链的C1-C6-烷基,n为0、1或2,R2和R2'相同或不同,是一个
CH2-R8基团,其中R8为H或线性或支链的C1-C6-烷基,R5和R5'相同或不同,可以是线性或支链的C1-C6-烷基或OR基团,其中R是C1-C6-烷基,R6和R6'相同或不同,可以是一个C(R9)3基团,其中R9相同或不同,R9可以是H或线性或支链的C1-C6-烷基,或者R5和R6和/或R5'和R6'结合形成一个未取代的4-7环成环到
茚基的苯环,但如果R5和R6以及R5'和R6'结合形成一个未取代的5环成环到
茚基的苯环,则R2和R2'不是
CH3基团,(ii)一种氧化铝烷辅助催化剂和(iii)可选的含
硼辅助催化剂。