| abstract |
A homopolymer of propylene, said homopolymer being producible byna process of polymerizing propylene under suitable polymerizationnconditions with a catalyst system comprising a bridged sandwich-bondednmetallocene of a metal selected from Group IV of the Periodic Table,nin which the organic ligand is selected from compounds of the formulan nwherein Z and Z' are different; Z is an unsubstituted fluorenyl radicalnor a symmetrically substituted fluorenyl radical; Z' is an unsubstitutedncyclopentadienyl radical, a symmetrically substituted cyclopentadienylnradical, an unsubstituted fluorenyl radical, or a symmetrically substitutednfluorenyl radical; and each R' is the methyl or phenyl radical. |