申请人:MITSUI CHEMICALS, INC.
公开号:US09969827B2
公开(公告)日:2018-05-15
A process capable of producing an ethylene/α-olefin copolymer having a high molecular weight even under the conditions of a high polymerization temperature is provided. The process for producing an ethylene/α-olefin copolymer includes copolymerizing ethylene and an α-olefin having 3 or more carbon atoms in the presence of an olefin polymerization catalyst including a crosslinked metallocene compound (A) represented by the following general formula [I] and a cocatalyst component (B). In the general formula [I], Y is selected from a carbon atom, etc., M is a hafnium atom or the like, R1 to R12 are each selected from a hydrogen atom, a hydrocarbon group, etc., R13 and R14 are each a substituted aryl group or the like, at least one of R13 and R14 is a substituted aryl group having one or more electron-donating substituents having a Hammett substituent constant σ of not more than −0.2, Q is selected from a halogen atom, etc., and j is an integer of 1 to 4.
提供了一种能够在高聚合温度条件下产生具有高分子量的乙烯/α-烯烃共聚物的工艺。生产乙烯/α-烯烃共聚物的工艺包括在存在包括交联的茂金属化合物(A)和辅助催化剂组分(B)的烯烃聚合催化剂的情况下,共聚乙烯和具有3个或更多碳原子的α-烯烃。在通用公式[I]中,Y从碳原子等中选择,M是钽原子或类似物,R1至R12分别从氢原子、碳氢基团等中选择,R13和R14分别是取代芳基团或类似物,其中R13和R14中至少一个是具有一个或多个电子给予取代基的取代芳基团,其Hammett取代常数σ不超过-0.2,Q从卤素原子等中选择,j是1至4之间的整数。