Patent ID: 6630546
Filing Date: 2003-10-07
Classification: C08F,Y10S

Abstract:
A process for the preparation of a linear low-density polyolefin, comprising:reacting an olefin monomer with hydrogen and an &agr;-olefin co-monomer in a slurry polymerization in the presence of a catalyst comprising: (i) a metallocene catalyst component of general formula Râ€³(CpRm)(Cpâ€²Râ€²n)MQ2, wherein Cp is a cyclopentadienyl moiety, Cpâ€² is a substituted fluorenyl ring; Râ€³ is a structural bridge imparting stereorigidity to said metallocene catalyst component; each R is independently hydrogen or a hydrocarbyl having 1 to 20 carbon atoms in which 0&lE;m&lE;4; each Râ€² is independently â€”SiRâ€²â€³3 in which each Râ€²â€³ is independently hydrogen or a hydrocarbyl having 1 to 20 carbon atoms, and 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 atoms or halogen; said metallocene catalyst component having a centroid-M-centroid angle in the range from 105Â° to 125Â°; (ii) an aluminum- or boron-containing co-catalyst; and (iii) said catalyst is supported on an inert support.