Metallocene compounds and their use in catalysts for the polymerization of olefins
AssigneeMontell Technology Company BV
InventorsLuigi Resconi, Davide Balboni, Vu Anh Dang, Lin-Chen Yu
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Abstract
It is disclosed a new class of bridged metallocene compounds of formula (I): wherein R1 and R2 can be hydrogen, alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl radicals; R3 and R4 form a condensed, 5- to 8-membered, aliphatic, aromatic or heterocyclic ring; M is a transition metal of groups 3, 4, 5, lanthanide or actinide; X is hydrogen, halogen, —R, —OR, —OSO2CF3, —OCOR, —SR, —NR2 or PR2, wherein R is an hydrocarbon substituent; and p is 0-3. Furthermore, a catalyst system for olefin polymerization based on the above bridged metallocene compounds and the ligands for their preparation are disclosed.
Claims14
A bridged metallocene compound having formula (III):
- wherein R2 is hydrogen;
- R1 is selected from the group consisting of hydrogen atoms, linear or branched, saturated or unsaturated C1-C20-alkyl, C3-C20-cycloalkyl, C6-C20-aryl, C7-C20-alkylaryl and C7-C20-arylalkyl radicals, optionally containing Si or Ge atoms;
- M is a transition metal belonging to groups 3, 4, 5 or to the lanthanide or actinide groups of the Periodic Table of the Elements (new IUPAC notation);
- the groups X, the same or different from each other, are monoanionic sigma ligands selected from the group consisting of hydrogen, halogen, —R, —OR, —OSO2CF3, —OCOR, —SR, —NR2 and PR2 groups, wherein the R substituents are C1-C20-alkyl, C3-C20-cycloalkyl, C2-C20-alkenyl, C6-C20-aryl, C7-C20-alkylaryl or C7-C20-arylalkyl, radicals, optionally containing Si or Ge atoms;
- p is an integer ranging from 0 to 3, being equal to the oxidation state of the metal M minus two;
- the R5 substituents, the same or different from each other, are selected from the group consisting of linear or branched, saturated or unsaturated, C1-C20-alkyl, C3-C20-cycloalkyl, C6-C20-aryl, C7-C20-alkylaryl and C7-C20-arylalkyl radicals, optionally containing Si or Ge atoms, or two vicinal R5 substituents form a ring having from 5 to 8 members;
- the R5 groups in the positions 4 and 7 of the indenyl residues are different from hydrogen;
- and n is an integer ranging from 2 to 4.
Dependencies are inferred from the claim text.