Olefin polymerization catalyst and process for olefin polymerization

A process for olefin polymerization, comprising polymerizing an olefin in the presence of an olefin polymerization catalyst comprising (A-2) 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 (II):

• ##STR32## wherein M.sup.1, M.sup.2 and M.sup.3 are each one metal selected from Sc, Y, Tr, Zr, Hf, V, Nb, Ta, Cr, Mo, W and lanthanoid metals, and at least two of M.sup.1, M.sup.2 and M.sup.3 are different from each other;
• Cp.sup.1, Cp.sup.2, Cp.sup.3 and Cp.sup.4 are each a 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.sup.1 and R.sup.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, wherein said substituted alkylene group is substituted with hydrocarbon group having 1-6 carbon atoms, and wherein said substituted silylene group is substituted with hydrocarbon group having 1-6 carbon atoms;
• and
• X, Y and Z are each a 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.

A process for olefin polymerization, comprising polymerizing an olefin in the presence of an olefin polymerization catalyst comprising (A-3) a transition metal compound, and (B) an organoaluminum oxy-compound selected from an aluminoxane compound, a benzene-insoluble organoaluminum oxy-compound and an organoboron compound, said transition metal compound being represented by the following formula (III):

• ##STR34## wherein M.sup.7 is a transition metal selected from Sc, Y, T, Zr, Hf, V, Nb, Ta, Cr, Mo, W and lanthanoid metals, M.sup.8 is a transition metal selected from Mn, Tc, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd and Hg, and M.sup.9 is a transition metal, and M.sup.7 and M.sup.9, M.sup.8 and M.sup.9 are the same as or different from each other;
• Cp.sup.1, Cp.sup.2, Cp.sup.3 and Cp.sup.4 are each a 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.sup.1 and R.sup.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, wherein said substituted alkylene group is substituted with hydrocarbon group having 1-6 carbon atoms, and wherein said substituted silylene group is substituted with hydrocarbon group having 1-6 carbon atoms;
• and
• X, Y and Z are each a 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 1-4;
• m is an integer of 1-5;
• and
• p is an integer of 1-5.