This invention relates to bridged indenyl metallocene compositions and their
use in the preparation of catalyst systems for olefin polymerization, particularly
propylene polymerization. The bridge may be represented by the formula:
##STR1##
wherein: R17 to R24 are identical or different, and
are one of a hydrogen atom, a C1-C10 alkyl group, a C1-C10
alkoxy group, a C6-C10 aryl group, a C6-C10
aryloxy group, a C2-C10 alkenyl group, a C7-C40
arylalkyl group, a C7-C40 alkylaryl group, a C8-C40
arylalkenyl group, or a halogen atom, or together are 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 R17 to R24, including
R20
and R21, together with the atoms connecting them form one or more
rings; and M2 is carbon, silicon, germanium or tin.
