| abstract |
Catalyst system for producing ethylene copolymers in a high temperature solution process, the catalyst system comprising n(i) a metallocene complex of formula (I)n nwherein nM is Hf or Zr nX is a sigma ligand, nL is a bridge of the formula -SiR 8 2 -, wherein each R 8 is independently a C 1 -C 20 -hydrocarbyl, tri(C 1 -C 20 -alkyl)silyl, C 6 -C 20 -aryl, C 7 -C 20 -arylalkyl or C 7 -C 20 -alkylaryl nn is 0, 1 or 2 nR 1 and R 1' are the same or can be different and can be a linear or branched C 1 -C 6 -alkyl group, nR 2 and R 2' are the same or are different and are a CH 2 -R 9 group, with R 9 being H or linear or branched C 1 -C 6 -alkyl group nR 5 and R 5' are the same or are different and can be H or a linear or branched C 1 -C 6 -alkyl group or a OR group, wherein R is a C 1 -C 6 -alkyl group nR 6 and R 6' are the same or are different and can be H or a C(R 10 ) 3 group, with R 10 being the same or different and R 10 can be H or a linear or branched C 1 -C 6 -alkyl group nor R 5 and R 6 and/or R 5' and R 6' taken together form an unsubstituted 4-7 membered ring condensed to the benzene ring of the indenyl moiety, and nR 7 and R 7' can be the same or are different and can be H or a linear or branched C 1 -C 6 -alkyl group n n(ii) an aluminoxane cocatalyst and (iii) a boron containing cocatalyst |