| 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 m 2/g. An alkylalumoxane cocatalyst component is incorporated on the support. The isospecific metallocene is characterized by the formula: <?in-line-formulae description="In-line Formulae" end="lead"?>B(CpRaRb)(FlR'<SUB>2</SUB>)MQ<SUB>n </SUB> (1)<?in-line-formulae description="In-line Formulae" end="tail"?> or by the formula: <?in-line-formulae description="In-line Formulae" end="lead"?>B'(Cp'R'aR'b)(Fl')M'Q'<SUB>n'</SUB> (2)<?in-line-formulae description="In-line Formulae" end="tail"?> 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 C<SUB>1-</SUB>C<SUB>4 </SUB>alkyl group; and n' is an integer of from 0-4. |
