Patent ID: 6369175
Filing Date: 2002-04-09
Classification: C07F,C08F,C08L,Y10S

Abstract:
A process for polymerizing propylene, said process comprising:a) selecting a metallocene compound described by the formula: Râ€³(CpRn)(CpRâ€²m)MeHal2 wherein Râ€³(CpRn)(CpRâ€²m) is an isopropylidene (3-methylcyclopentadienyl-1-fluorenyl) radical; Me is a Group IVb, Vb, or VIb metal; each Hal is a halogen; b) activating the metallocene compound as a metallocene catalyst with methylaluminoxane; c) polymerizing propylene with the metallocene catalyst; d) forming hemiisotactic polypropylene; e) selecting a second metallocene compound described by the formula: Râ€³(CpRn)(CpRâ€²m)MeHal2 wherein Râ€³(CpRn)(CpRâ€²m) is an isopropylidene (cyclopentadienyl-1-fluorenyl) radical; Me is a Group IVb, Vb, or VIb metal; each Hal is a halogen; and f) forming a reactor blend of hemiisotactic polypropylene and syndiotactic polypropylene.