Metallocene catalyst component with good catalyst efficiency after aging

Abstract

This invention relates to a syndiospecific metallocene of a substituted iPr[(cyclopentadienyl)(fluorenyl)]zirconium dichloride containing long-chain terminal alkene, for example octenyl groups, on fluorene at C2/C7. The metallocene compound useful as a catalyst in the present invention is described by the general formula: R"(C.sub.5 H.sub.4)(C.sub.4 H.sub.4-m R'.sub.m C.sub.5 C.sub.4 H.sub.4-n R'.sub.n)MeQ.sub.p wherein (C.sub.5 H.sub.4) is a cyclopentadienyl ring and (C.sub.4 H.sub.4-m R'.sub.m C.sub.5 C.sub.4 H.sub.4-n R'.sub.n) is a fluorenyl radical; R' is a long chain alkene substituent having 514 20 carbon atoms on the fluorene ligand at C2 or C7, each R' may be the same or different; R" is a structural bridge between the (C.sub.5 H.sub.4) and (C.sub.4 H.sub.4-m R'.sub.m C.sub.5 C.sub.4 H.sub.4-n R'.sub.n) rings to impart stereorigidity; Q is a hydrocarbon radical or a halogen; Me is a Group IIIB, IVB, VB, or VIB metal; m=0 or 1; n=1; and p is the valence of Me minus 2. Polymerizations with metallocene/MAO solutions stored at room temperature under nitrogen for several days resulted in gradual increases in polymer yields when using the metallocene of the present invention and a decrease in polymer yield when using metallocne of the prior art.

Dependencies are inferred from the claim text.