Olefin polymerization process and polymer produced

A polymerization process comprising contacting at least one alpha-olefin monomer under polymerization conditions with a catalyst system comprising:

• (1) a catalyst A comprising an organometal compound and a transition metal compound,
• wherein said organometal compound is selected from the group consisting of alkali metal alkyls and alkaline earth metal alkyls and mixtures thereof, and
• wherein said transition metal compound is selected from the group consisting of compounds having the formula TiX.sub.4, wherein each X is individually selected from the group consisting of halogen, alkyl, alkoxy, and aryl radicals;
• and
• (2) a catalyst B comprising a rare earth complex having a formula Cp.sub.n MX.sub.4-n.M'L.sub.x, wherein Cp is cyclopentadienyl or cyclopentadienyl substituted with an alkyl or alkyl silyl radical, M is yttrium, scandium or a rare earth metal having an atomic number in the range of 57 to 71, M' is an alkali metal, L is a suitable electron donor ligand, X is a halogen, n is 1 or 2, and x is a number corresponding to the value needed to form a stable complex.