| 摘要 |
Method employing a supported metallocene catalyst composition in the production of an isotactic ethylene propylene co-polymer. The composition comprises a metallocene component supported on a particulate silica support having average particle size of 10-40 microns, a pore volume of 1.3-1.6 ml/g, a surface area of 200-400 m2/g. An alkylalumoxane cocatalyst component is incorporated on the support. The isospecific metallocene is characterized by the formula: B(CpRaRb)(FlR'2)MQn(1) or by the formula: B'(Cp'R'aR'b)(Fl')M'Q'n'(2) In the formulas Cp and Cp' are substituted cyclopentadienyl groups, Fl and Fl' are fluorenyl groups, and B and B' are structural bridges. R' are substituents at the 2 and 7 positions, Ra and R'a are substituents distal to the bridge, and Rb and R'b are proximal to the bridge. M and M' are transition metals, Q' is a halogen or a C1-C4 alkyl group; and n' is an integer of from 0-4.
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