TRANSITION METAL COMPOUND, POLYMERIZATION CATALYST FOR OLEFINS, AND PROCESS FOR PRODUCING OLEFINIC POLYMERS

摘要

A novel double-bridged transition metal compound of general formula (I), wherein M is a metal element selected from among Group 3 to 10 metal elements and lanthanoid metal elements of the periodic table; E<1> and E<2> are each cyclopentadienyl, indenyl or the like and are bridged through A<1> and A<2>; A<1> and A<2> are each a hydrocarbon bridging group having at least one carbon atom; X is a sigma -bonding ligand; and Y is a Lewis base; double bridged biscyclopentadienyl and bisindenyl derivatives useful in the preparation of the above transition metal compound; a process for the preparation thereof; a polymerization catalyst for olefins comprising the transition metal compound; and a process for producing an olefinic polymer using the catalyst. The above polymerization catalyst exhibits high activity and copolymerizability, and can efficiently give olefinic polymers having a uniform composition and a narrow molecular weight distribution.