Metallocene and a new single site catalyst component

A method for preparing an active catalyst system comprising:

• providing a metallocene catalyst component of:
• formula (I):
• R″(CpRm)(C′pR′n)MQ2 (I)
• wherein Cp is a cyclopentadienyl ring;
• C′p is a fluorenyl ring;
• R″ is a structural bridge between Cp and C′p;
• each R or R′ is the same or different and is selected from a hydrocarbyl group having from 1-20 carbon atoms, a halogen, an alkoxy group, an alkoxyalkyl group, an alkylamino group or an alkylsilyl group or two neighbouring substituents can be linked to form a cycle;
• M is a metal atom from group 4 of the Periodic Table;
• and each Q is a hydrocarbon having from 1-20 carbon atoms or is a halogen;
• m is an integer from 1 to 4 and n is an integer from 1 to 8;
• or of formula (I′)
• R″(IndRq)2MQ2 (I′)
• wherein R″, M, Q and R are as described above, Ind is an indenyl group and q is an integer from 1 to 6;
• or of formula (I″)
• R″(CpRm)XMQ2 (I″)
• wherein R″, Cp, M, Q, R and m are as defined previously and X is a heteroatom, substituted or unsubstituted selected from P or O;
• wherein the metal is hafnium in the metallocene catalyst components of formula I or I′;
• and
• providing a single site polymerisation catalyst component of formula (II):
• (L)nMe(Q′)p (II)
• wherein L is a heteroatom-containing ligand;
• n is an integer of 1, 2, or 3;
• Me is Fe;
• each Q′ is independently a hydrocarbon having 1-20 carbon atoms or a halogen;
• and p is the valence of Fe minus the sum of the coordination numbers of all L;
• providing at least one inorganic support;
• impregnating the inorganic support(s) with an activating agent comprising methylaluminoxane combined with a sterically hindered Lewis base, wherein for formulas (I) and (I′), the methylaluminoxane is MMAO;
• adding a solution of the metallocene catalyst component to the impregnated inorganic support(s);
• adding a solution of the single site polymerisation catalyst component of formula (II) to the impregnated inorganic support(s) or to another impregnated inorganic support;
• and
• retrieving the active catalyst system.