Olefin polymerization catalyst, process for preparing olefin polymer, and olefin polymer
申请人:Mitsui Chemicals Inc
公开号:US06297333B1
公开(公告)日:2001-10-02
The olefin polymerization catalyst of the invention is formed from a Group IVB transition metal compound represented by the following formula (I) and an organoaluminum oxy-compound or a compound which reacts with the transition metal compound to form an ion pair. In the olefin polymerization process of the invention using this catalyst or a catalyst formed from a Group IVB transition metal compound represented by the following formula (II) and an organoaluminum oxy-compound or a compound which reacts with the transition metal compound to form an ion pair, an olefin (co)polymer having a high molecular weight can be obtained with high polymerization activities, and besides an olefin copolymer having a high comonomer content can be obtained even if a comonomer is used in a small amount,
wherein, M is a transition metal of Group IVB, at least one of R1 is an aryl group and the remainder is hydrogen or the like, R2 is hydrogen, an alkyl group or the like, R3 and R4 are each hydrogen, an alkyl group or the like, R6 is hydrogen, an alkyl group or the like, R7 is hydrogen, an alkyl group or the like, any one of R8 and R9 is an alkyl group, and X1 and X2 are each halogen, a hydrocarbon group or the like.
本发明的烯烃聚合催化剂由以下式(I)所表示的IVB族过渡金属化合物和有机铝氧化合物或与过渡金属化合物反应形成离子对的化合物组成。在使用此催化剂或由以下式(II)所表示的IVB族过渡金属化合物和有机铝氧化合物或与过渡金属化合物反应形成离子对的催化剂进行烯烃聚合过程中,可以获得高分子量的烯烃(共)聚合物,其聚合活性高,即使使用少量共聚单体,也可以获得高共聚单体含量的烯烃共聚物。其中,M是IVB族过渡金属,R1中至少一个是芳基,其余为氢或类似物,R2是氢、烷基或类似物,R3和R4各自是氢、烷基或类似物,R6是氢、烷基或类似物,R7是氢、烷基或类似物,R8和R9中的任意一个是烷基,X1和X2各自是卤素、碳氢基或类似物。