Novel homopolymers of propylene exhibiting more than 50% syndiotacticity and more than 50 wt-% xylene solubles

摘要

A homopolymer of propylene, said homopolymer being producible by a process of polymerizing propylene under suitable polymerization conditions with a catalyst system comprising a bridged sandwich-bonded metallocene of a metal selected from Group IV of the Periodic Table, in which the organic ligand is selected from compounds of the formula wherein Z and Z' are different; Z is an unsubstituted fluorenyl radical or a symmetrically substituted fluorenyl radical; Z' is an unsubstituted cyclopentadienyl radical, a symmetrically substituted cyclopentadienyl radical, an unsubstituted fluorenyl radical, or a symmetrically substituted fluorenyl radical; and each R' is the methyl or phenyl radical.