Patent ID: 6395668
Filing Date: 2002-05-28
Classification: C08F

Abstract:
A catalyst system for the polymerization of olefins comprising the product obtained by contacting the following components:(A) one or more late transition metal compounds having formula (I) or (II): LMXpXâ€²sâ€ƒâ€ƒ(I) LMAâ€ƒâ€ƒ(II) â€ƒwherein M is a metal belonging to Group 8, 9, 10 or 11 of the Periodic Table of the Elements; L is a bidentate or tridentate ligand of formula (III): â€ƒwherein: B is a C1-C50 bridging group linking E1 and E2, optionally containing one or more atoms belonging to Groups 13-17 of the Periodic Table; E1 and E2, the same or different from each other, are elements belonging to Group 15 or 16 of the Periodic Table and are bonded to said metal M; the substituents R1, the same or different from each other, are selected from the group consisting of hydrogen, linear or branched, saturated or unsaturated C1-C20 alkyl, C1-C20 alkyliden, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl and C7-C20 arylalkyl radicals, optionally containing one or more atoms belonging to groups 13-17 of the Periodic Table; or two adjacent R1 substituents form a saturated, unsaturated or aromatic C4-C8 ring, having from 4 to 20 carbon atoms; m and n are independently 0, 1 or 2, so to satisfy the valence number of E1 and E2; q is the charge of the bidentate or tridentate ligand so that the oxidation state of MXpXâ€²s or MA is satisfied, the compound (I) or (II) being overall neutral; the substituents X, the same or different from each other, are monoanionic sigma ligands selected from the group consisting of hydrogen, halogen, â€”R, â€”OR, â€”OSO2CF3, â€”OCOR, â€”SR, â€”NR2 and â€”PR2 groups, wherein the R substituents are linear or branched, saturated or unsaturated, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl or C7-C20 arylalkyl radicals, optionally containing one or more atoms belonging to groups 13-17 of the Periodic Table; or two X groups form a metallacycle ring containing from 3 to 20 carbon atoms; Xâ€² is a coordinating ligand selected from mono-olefins and neutral Lewis bases wherein the coordinating atom is N, P, O or S; p is an integer ranging from 0 to 3; s ranges from 0 to 3; A is a &pgr;-allyl or a &pgr;-benzyl group; and (B) the reaction product of water with one or more organometallic aluminum compounds of formula (IV): Al(CH2â€”CR3R4R5)xR6yHzâ€ƒâ€ƒ(IV) â€ƒwherein in any (CH2â€”CR3R4R5) groups, the same or different from each other, R3 is a linear or branched, saturated or unsaturated C1-C20 alkyl, C3-C20 cycloalkyl or C7-C20 alkylaryl radical, optionally containing one or more Si or Ge atoms; R4 is a saturated or unsaturated C3-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl or C7-C20 arylalkyl radical, optionally containing one or more Si or Ge atoms, said radical being different from a straight alkyl or alkenyl group; or R3 and R4 form together a C4-C6 ring; R5 is hydrogen or a linear or branched, saturated or unsaturated C1-C20 alkyl, C6-C20 aryl, C7-C20 alkylaryl or arylalkyl radical, optionally containing one or more Si or Ge atoms; R6 is a linear or branched, saturated or unsaturated C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl or C7-C20 arylalkyl radical; x is an integer ranging from 1 to 3; z is 0 or 1; and y is 3âˆ’xâˆ’z, the molar ratio between said organometallic aluminum compound and water being comprised between 0.5:1 and 100:1.