Metallocene compounds and use thereof in catalysts for the polymerization of olefins
AssigneeMontell Technology Company BV
InventorsClyde E. Bishop, Robert L. Jones JR., Krishna Raman, Vu Anh Dang, Lin-Chen Yu, Luigi Resconi, Tiziano Dall'Occo, Maurizio Galimberti
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Abstract
A class of bridged or unbridged metallocene compounds is disclosed, wherein the cyclopentadienyl ligands have two or four adjacent substituents forming one or two alkylenic cycles of from 4 to 8 carbon atoms. These metallocenes are useful as catalyst components for the polymerization of olefins, particularly for the (co)polymerization of ethylene and for the polymerization of propylene.
Claims22
A metallocene compound of formula (I)
- (YRp)q(CP)(CP′)MX2 (I)
- wherein Cp is a group selected from those of formula (II) and (III):
- 7
- wherein m and n, same or different from each other, are integer comprised between 2 and 6 and, preferably, comprised between 3 and 5;
- Cp′ is a group selected from those of formula (II), (III) e (IV):
- 8
- wherein (YRp)q is a divalent group which bridges the two groups Cp and Cp′, Y being selected indifferently from C, Si, Ge, N and P;
- p is 1 when Y is N or P, and is 2 when Y is C, Si or Ge;
- q can be 0,-1, 2 or 3;
- M is a transition metal selected from Ti, Zr or Hf;
- the substituents X, same or different from each other, are halogen atoms, —OH, —SH, R, —OR, —SR, —NR2 or —PR2;
- the substituents R, same or different from each other, are hydrogen atoms, C1-C20 alkyl radicals, C3-C20 cycloalkyl radicals, C2-C20 alkenyl radicals, C6-C20 aryl radicals, C7-C 20 alkylaryl radicals or C7-C20 arylalkyl radicals, optionally containing Si or Ge atoms and, additionally, two adjacent R substituents on Cp or Cp′ may form a C5-C8 cycle and, further, two R substituents of the same YR2 group or of two adjacent YR2 groups may form a ring comprising from 3 to 8 atoms;
- when q=0, the R′ substituents are difined as the R substituents while, when q=l, 2 or 3, the two R′ substituents of the groups Cp and Cp′ together form the divalent group (YRp)q.
A process for the preparation of a cyclopentadienylic compound of formula (II), which comprises reacting, in an acid medium, a cycloalkene of formula (V):
- 9
- with a 1-cycloalkene derivative of formula (VI):
- 10
- wherein n, m and R have the meaning given and X is OH, OR, O(CO)R, Cl or Br.
A process for the preparation of a cyclopentadienylic compound of formula (III), which comprises reacting, in an acid medium, a cycloalkene of formula (V′):
- 11
- with a benzene derivative of formula (VIII):
- 12
- wherein n, m, R and X have the meaning given above.
A cyclopentadiene ligand of formula (XI):
- (YRp)q(CP)(CP′) (XI)
- wherein Cp, Cp′, (YRp)q, Y, R, p and q have the meaning given above.
A catalyst for the polymerization of olefins comprising the reaction product between:
- (A) a metallocene compound of formula (I), optionally as a reaction product with a organo-aluminiumo of formula AlR43 or Al2R46, in which the substituents R4, same or different from each other are R1 or halogen, and
- (B) an aluminoxane, optionally in admixture with a organo-aluminium compound of formula AlR43 or Al2R46, in which the substituents R4, same or different from each other, are defined as above or one or more compounds capable of forming a alkyl metallocene cation.
Dependencies are inferred from the claim text.