申请人:Mitsui Toatsu Chemicals, Incorporated
公开号:US05359102A1
公开(公告)日:1994-10-25
A transition metal compound represented by the formula ##STR1## (wherein each of A.sup.1, A.sup.2, A.sup.3 and A.sup.4 is a cyclopentadienyl group, an indenyl group, a fluorenyl group or their derivative; A.sup.5 is a hydrocarbondiylidene group having 4 to 30 carbon atoms; a pair of A.sup.1 and A.sup.2 as well as a pair of A.sup.3 and A.sup.4 is respectively bonded to the identical carbon atom in A.sup.5 to form a crosslinking structure; each of R.sup.1 and R.sup.2 is a halogen atom, a hydrogen atom, an alkyl group or a silicon-containing alkyl group having 1 to 10 carbon atoms, an aryl group, an alkylaryl group, an arylalkyl group or a halogenated aryl group having 6 to 20 carbon atoms; R.sup.1 and R.sup.2 may be identical or different; each of M.sup.1 and M.sup.2 is titanium, zirconium or hafnium; and M.sup.1 and M.sup.2 may be mutually identical or different), and a method for polymerizing an olefin in the presence of this compound and a co-catalyst. A combination of the above-mentioned compound and another known transition metal compound as the transition metal compounds permits preparation of a polyolefin having a wide molecular weight distribution.
一种由以下式表示的过渡金属化合物##STR1##(其中A.sup.1、A.sup.2、A.sup.3和A.sup.4中的每一个是环戊二烯基、茚基、萘基或它们的衍生物;A.sup.5是具有4到30个碳原子的烃基亚甲基基团;A.sup.1和A.sup.2的一对以及A.sup.3和A.sup.4的一对分别与A.sup.5中的相同碳原子键合以形成交联结构;R.sup.1和R.sup.2中的每一个是卤素原子、氢原子、烷基或含硅烷基,具有1到10个碳原子,芳基,烷基芳基,芳基烷基或含有6到20个碳原子的卤代芳基;R.sup.1和R.sup.2可以相同也可以不同;M.sup.1和M.sup.2中的每一个是钛、锆或铪;M.sup.1和M.sup.2可以相同也可以不同),以及在该化合物和辅催化剂存在下聚合烯烃的方法。上述化合物与另一种已知的过渡金属化合物的组合作为过渡金属化合物,可制备具有宽分子量分布的聚烯烃。