Metallocene compositions

3 17 24 110 110 610 610 210 740 740 840 17 2420 2117 24 2 This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization. The metallocene compositions are generally those of the bridged bis(2-R-4-phenylindenyl)metallocene type wherein the bridge is represented by the formula: wherein: Rto Rare identical or different and are one of a hydrogen atom, a C-Calkyl group, a C-Calkoxy group, a C-Caryl group, a C-Caryloxy group, a C-Calkenyl group, a C-Carylalkyl group, a C-Calkylaryl group, a C-Carylalkenyl group, or a halogen atom, or a conjugated diene which is optionally substituted with one or more hydrocarbyl, tri(hydrocarbyl)silyl groups or hydrocarbyl, tri(hydrocarbyl)silylhydrocarbyl groups, said diene having up to 30 atoms not counting hydrogen; or two or more adjacent radicals Rto R, including Rand R, together with the atoms connecting them form one or more rings; preferably, Rto Rare hydrogen, and Mis carbon, silicon, germanium or tin, preferably silicon.