Olefin polymerization catalyst and process for olefin polymerization

Claim 1

An olefin polymerization catalyst comprising (A- 1) a transition metal compound and (B) an organoaluminum oxy-compound selected from the group consisting of an aluminoxane compound and a benzene-insoluble organoaluminum oxy-compound or an organoboron compound, said transition metal compound being represented by the following formula (I): ##STR30## wherein M 1 , M 2 and M 3 are the same metals as each other and are each one metal selected from Sc, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and lanthanoid metals; Cp 1 , Cp 2 , Cp 3 and Cp 4 are each one group having a cyclopentadienyl skeleton, which may have a substituent, and the groups having a cyclopentadienyl skeleton may be the same as or different from each other; R 1 and R 2 are each one bond group selected from the group consisting of an alkylene group, a substituted alkylene group, a silylene group, a substituted silylene group, a divalent tin-containing group and a divalent germanium-containing group or a single bond and the groups may be the same as or different from each other; and X, Y and Z are each one group selected from a hydrocarbon group, a nitrogen-containing group, an oxygen-containing group, a silicon-containing group, a phosphorus-containing group and a sulfur-containing group, or an atom selected from a halogen atom and a hydrogen atom, the groups or atoms indicated by X, Y and Z may be the same as or different from each other, and a pair of X and Y, a pair of Y and Z, or a pair of X and Z may form a bond group selected from --O-- and --S--, or may form a divalent bond group containing at least one atom selected from an oxygen atom, a carbon atom, a silicon atom, a germanium atom, a phosphorus atom and a sulfur atom; and n is an integer of 1-5; m is an integer of 1-5; p is an integer of 1-5; and q is 0 or 1.