Catalyst system for producing polyethylene copolymers in a high temperature solution polymerization process
申请人:BOREALIS AG
公开号:US11279781B2
公开(公告)日:2022-03-22
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 a mixture with Zr, provided that more than 50% by moles of the complex of Formula I has M=Hf;
X is a sigma ligand;
R are the same or different from each other and can be saturated linear or branched C1-C10 alkyl, C6-C10 aryl, C4-C10 heteroaryl, C6-C20 alkylaryl or C6-C20 arylalkyl groups, which can optionally contain up to 2 heteroatoms or silicon atoms;
R1 is a C6-C10 aryl or C6-C20 alkylaryl group optionally containing up to 2 heteroatoms or silicon atoms or a C4-C10 heteroaryl group;
R2 is a C4-C20 cycloalkyl group, optionally carrying alkyl substituents in beta-positions, of formula (II)
in which R′ can be the same or can be different from each other and can be hydrogen or is defined as R and n is 1 to 17; and
(ii) a boron containing cocatalyst.
生产高温溶液共聚乙烯的催化剂体系,该催化剂体系包括:(i) 公式(I)的金属茂配合物,其中M为Hf或与Zr的混合物,但公式(I)中M=Hf的复合物摩尔分数超过50%;X为σ配体;R是相同或不同的饱和直链或支链C1-C10烷基,C6-C10芳基,C4-C10杂环芳基,C6-C20烷基芳基或C6-C20芳基烷基基团,可选地含有最多2个杂原子或硅原子;R1为C6-C10芳基或C6-C20烷基芳基基团,可选地含有最多2个杂原子或硅原子,或C4-C10杂环芳基基团;R2为C4-C20环烷基,可选地在β位携带烷基取代基,其化学式为(II)其中R′可以相同,也可以不同,并且可以是氢,或者定义为R,n为1到17;以及(ii) 含硼的协同催化剂。