申请人:Mitsui Chemicals, Inc.
公开号:US06004897A1
公开(公告)日:1999-12-21
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. ##STR1## wherein, M is a transition metal of Group IVB, at least one of R.sup.1 is an aryl group and the remainder is hydrogen or the like, R.sup.2 is hydrogen, an alkyl group or the like, R.sup.3 and R.sup.4 are each hydrogen, an alkyl group or the like, R.sup.6 is hydrogen, an alkyl group or the like, R.sup.7 is hydrogen, an alkyl group or the like, any one of R.sup.8 and R.sup.9 is an alkyl group, and X.sup.1 and X.sup.2 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形成。使用该催化剂或由以下式(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形成的催化剂进行烯烃聚合过程,可以获得高分子量的烯烃(共)聚合物,并且即使使用少量的共聚单体,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中至少有一个是芳基,其余为氢或类似物,R2为氢,烷基或类似物,R3和R4分别为氢,烷基或类似物,R6为氢,烷基或类似物,R7为氢,烷基或类似物,R8和R9中的任意一个为烷基,X1和X2分别为卤素,烃基或类似物。