Patent ID: 6372684
Filing Date: 2002-04-16
Classification: B01J,C07C,Y10S

Abstract:
A catalyst system for &agr;-olefin oligomerization comprising the product obtainable by contacting the following components:(A) one or more bis-amido compounds having formula (I): â€ƒwherein M is Ti, Zr or Hf; N is a trivalent nitrogen atom; the Y atoms, the same or different from each other, are selected from the group consisting of Si, Ge and Sn; the X groups, the same or different from each other, are selected from the group consisting of hydrogen, halogen, linear or branched, saturated or unsaturated C1-C20 alkyl, C1-C20 alkoxyl, C3-C20 cycloalkyl, C6-C20 aryl, C6-C20 aryloxyl, C7-C20 alkylaryl and C7-C20 arylalkyl radicals, optionally containing one or more Si, Ge, O, S, P, B or N atoms; or two X groups form a ring having from 4 to 8 members; R1, R2, R3, R4, R5 and R6, the same or different from each other, 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 Si, Ge, O, S, P, B or N atoms; or are Si(R7)3 groups, wherein the groups R7, the same or different from each other, are linear or branched, saturated or unsaturated C1-C10 alkyl, C3-C10 cycloalkyl, C6-C15 aryl, C7-C15 alkylaryl or C7-C15 arylalkyl groups; or two or four substituents of R1, R2, R3, R4, R5 and R6, linked to two vicinal atoms, form one or two rings having from 4 to 8 members; Q is a neutral Lewis base; and m is an integer ranging from 0 to 2; said bis-amido compound being optionally present in the form of a dimer; (B) one or more activating cocatalysts selected from: compounds having formula Y+Zâˆ’, wherein Y+ is a cation capable of reacting irreversibly with a substituent X of the compound of formula (I), and Zâˆ’ is a compatible non-coordinating anion comprising at least one boron atom; and neutral strongly Lewis acidic compounds comprising at least one boron atom; (C) one or more compounds selected from the following classes: (a) organometallic aluminum compounds having formula (II): Al(CH2â€”CR8R9R10)xR11yHzâ€ƒâ€ƒ(II) wherein, in the (CH2â€”CR8R9R10) groups, the same or different from each other, R8 is a linear or branched, saturated or unsaturated C1-C10 alkyl, C3-C13 cycloalkyl or C7-C16 alkylaryl radical; R9 is a saturated or unsaturated C1-C50 alkyl, C3-C50 cycloalkyl, C6-C50 aryl, C7-C50 alkylaryl or C7-C50 arylalkyl radical, said radical being different from a straight alkyl or alkenyl group; or R8 and R9 form together a ring having from 4 to 6 carbon atoms; R10 is hydrogen or a linear or branched, saturated or unsaturated C1-C10 alkyl, C6-C15 aryl, C7-C16 alkylaryl radical or arylalkyl radical, optionally containing one or more Si or Ge atoms; R11 is a linear or branched, saturated or unsaturated C1-Câ€ƒalkyl, C3â€”C15 cycloalkyl, C6-C15 aryl, C7-C16 alkylaryl or C7-C16 arylalkyl radical; x is an integer ranging from 1 to 3; z is 0 or 1; and y is 3-x-z; and (b) the reaction products of water with organometallic aluminum compounds of formula (III): AlR123âˆ’wHwâ€ƒâ€ƒ(III) â€ƒwherein the substituents R12, the same or different from each other, are selected from the group consisting of linear or branched, saturated or unsaturated C1-C50 alkyl, C3-C50 cycloalkyl, C6-C50 aryl, C7-C50 alkylaryl and C7-C50 arylalkyl radicals, optionally containing one or more Si or Ge atoms, wherein at least one of said substituents R12 is different from a straight alkyl group; and w is 0 or 1; the molar ratio between said organometallic aluminum compound and water being comprised between 1:1 and 100:1.