Catalyst system for producing polyethylene copolymers in a high temperature solution polymerization process
申请人:BOREALIS AG
公开号:US10301411B2
公开(公告)日:2019-05-28
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 X is a sigma ligand, L is a bridge of the formula —SiR82—, wherein each R8 is independently a C1-C20-hydrocarbyl, tri(C1-C20-alkyl)silyl, C6-C20-aryl, C7-C20-arylalkyl or C7-C20-alkylaryl n is 0, 1 or 2 R1 and R1′ are the same or can be different and can be a linear or branched C1-C6-alkyl group, R2 and R2′ are the same or are different and are a CH2—R9 group, with R9 being H or linear or branched C1-C6-alkyl group R5 and R5′ are the same or are different and can be H or 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 H or a C(R10)3 group, with R10 being the same or different and R10 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, and R7 and R7′ can be the same or are different and can be H or a linear or branched C1-C6-alkyl group (ii) an aluminoxane cocatalyst and/or (iii) a boron containing cocatalyst and (iv) optionally an aluminum alkyl compound.
高温溶液法生产乙烯共聚物的催化剂体系,该催化剂体系包括(i)公式(I)的金属茂配合物,其中M为Hf,X为σ配体,L为公式—SiR82—的桥连基,其中每个R8独立地为C1-C20-烃基,三个(C1-C20-烷基)硅基,C6-C20-芳基,C7-C20-芳基烷基或C7-C20-烷基芳基,n为0、1或2,R1和R1'相同或不同,可以是线性或支链的C1-C6-烷基,R2和R2'相同或不同,是CH2—R9基团,其中R9为H或线性或支链的C1-C6-烷基,R5和R5'相同或不同,可以是H或线性或支链的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H或C(R10)3基团,其中R10相同或不同,可以是H或线性或支链的C1-C6-烷基,或R5和R6和/或R5'和R6'在一起形成未取代的4-7环成环到茂基苯环上,R7和R7'可以相同或不同,可以是H或线性或支链的C1-C6-烷基;(ii)铝氧烷协同催化剂和/或(iii)含硼协同催化剂;(iv)可选的铝烷基化合物。