Transition metal compound having two transition metal atoms in one molecule and method for polymerizing olefin by using the compound

摘要

PCT No. PCT/JP92/00080 Sec. 371 Date Oct. 8, 1992 Sec. 102(e) Date Oct. 8, 1992 PCT Filed Jan. 29, 1992 PCT Pub. No. WO92/15596 PCT Pub. Date Sep. 17, 1992.A transition metal compound represented by the formula (I) (wherein each of A1, A2, A3 and A4 is a cyclopentadienyl group, an indenyl group, a fluorenyl group or their derivative; A5 is a hydrocarbondiylidene group having 4 to 30 carbon atoms; a pair of A1 and A2 as well as a pair of A3 and A4 is respectively bonded to the identical carbon atom in A5 to form a crosslinking structure; each of R1 and R2 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; R1 and R2 may be identical or different; each of M1 and M2 is titanium, zirconium or hafnium; and M1 and M2 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.