Patent ID: 7141527

Claim:
A catalyst system for polymerizing olefins comprising a product obtained by contacting: (A) a metallocene complex of formula (I): (Cp)(ZR 1 m ) n (A) r ML p (I) wherein (ZR 1 m ) n is a divalent group bridging Cp and A; Z is selected from C, Si, Ge, N or P; R 1 being equal or different from each other, is selected from hydrogen or a linear or branched, saturated or unsaturated C 1 –C 20 alkyl, C 3 –C 20 cycloalkyl, C 6 –C 20 aryl, C 7 –C 20 alkylaryl, C 7 –C 20 arylalkyl and combinations thereof; Cp is a substituted or unsubstituted cyclopentadienyl group, optionally condensed to one or more substituted or unsubstituted, saturated, unsaturated or aromatic rings, containing from 4 to 6 carbon atoms, optionally containing one or more heteroatoms; A is selected from —O—, —S—, or —N(R 2 )—, wherein R 2 is selected from hydrogen, a linear or branched, saturated or unsaturated C 1 –C 20 alkyl, C 3 –C 20 cycloalkyl, C 6 –C 20 aryl, C 7 –C 20 alkylaryl or C 7 –C 20 arylalkyl, or A is Cp; M is selected from a transition metal belonging to group 3, 4, 5, or 6, or a lanthanide or actinide metal of the Periodic Table; L being equal or different from each other, is a monoanionic sigma ligand selected from the group consisting of hydrogen, halogen, —R 3 , —OR 3 , —OCOR 3 , —SR 3 , —NR 3 2 , —PR 3 2 and combinations thereof, wherein R 3 is selected from a linear or branched, saturated or unsaturated C 1 –C 20 alkyl, C 3 –C 20 cycloalkyl, C 6 –C 20 aryl, C 7 –C 20 alkylaryl, C 7 –C 20 arylalkyl and combinations thereof, wherein R 3 optionally contains one or more Si or Ge atoms; m is 1 or 2; n is an integer ranging from 0 to 4; r is 0 or 1, with the proviso that n is 0 when r is 0; p is an integer equal to an oxidation state of M minus 2 when r=1, and minus 1 when r=0, and ranges from 1 to 4; (B) an organometallic aluminum compound of formula (II): Al[CH 2 —C(Ar)R 4 R 5 ] x H y (II) wherein Ar is a substituted aryl group corresponding to formula (III): wherein R 6 , R 8 and R 10 are selected from the group consisting of hydrogen, halogen, —C(O)R 3 , —OR 3 , —SR 3 , —NR 3 2 and —NO 2 ; R 7 and R 9 are selected from the group consisting of hydrogen, halogen, C 6 –C 20 aryl, C 7 –C 20 alkylaryl and C 7 –C 20 arylalkyl, wherein R 7 and R 9 optionally contain one or more Si or Ge atoms; two adjacent substituents R 6 –R 10 optionally form a ring, having 3 to 8 carbon atoms; with the proviso that Ar is not an unsubstituted phenyl; R 4 is selected from a linear or branched, saturated or unsaturated, C 1 –C 10 alkyl, C 6 –C 20 aryl, C 7 –C 20 arylalkyl or C 7 –C 20 alkylaryl; R 5 is selected from hydrogen or a linear or branched, saturated or unsaturated, C 1 –C 10 alkyl, C 6 –C 20 aryl, C 7 –C 20 arylalkyl or C 7 –C 20 alkylaryl; R 4 and R 5 optionally form a ring, having 3 to 8 carbon atoms; a carbon atom in the compound of formula (II) being optionally replaced by a Si or a Ge atom; x is 2 or 3; y=3 minus x; and (C) water; wherein a molar ratio between the organometallic aluminium compound (B) and the water (C) is between 1:1 and 100:1.