Patent ID: 6559089
Filing Date: 2003-05-06
Classification: C08F,Y10S

Abstract:
A metallocene catalyst component for use in preparing isotactic polyolefins, which comprises (i) a catalyst component of the general formula:Râ€³CpR1R2R3)(Cpâ€²Râ€²n)MQ2 wherein Cp is a substituted cyclopentadienyl ring; Cpâ€² is a substituted or unsubstituted fluorcarbonyl ring; Râ€³ is a structural bridge imparting stereorigidity to the component; R1 is a substituent on the cyclopentadienyl ring which is distal to the bridge, which distal substituent comprises a group of the formula XRâ€²3, in which X is chosen from Group IVA, and each R* is the same or different and chosen from hydrogen or hydrocarbyl of from 1 to 20 carbon atoms, R2 is a substituent on the cyclopentadienyl ring which is proximal to the bridge and positioned non-vicinal to the distal substituent, and is of the formula YR#3, in which Y is chosen from Group IVA, and each R# is the same or different and chosen from hydrogen or hydrocarbyl of 1 to 7 carbon atoms, R3 is a substituent on the cyclopentadienyl ring which is proximal to the bridge and is hydrogen atom or is of the formula ZR$3, in which Z is chosen from the Group IVA, and each R$  is the same or different and chosen from hydrogen or hydrocarbyl of 1 to 7 carbon atoms, each Râ€² is the same or different and is hydrocarbyl of 1 to 20 carbon atoms in which 0&lE;n&lE;8; M is a Group IVB transition metal or vanadium; and each Q is hydrocarbyl having 1 to 20 carbon atoms or is a halogen; and (ii) a regioisomer thereof in which R2 is proximal to the bridge and positioned vicinal to the distal substituent.