Novel organometallic transition metal compound for catalyst system used for preparation of polyolefin

摘要

An organometallic transition metal compound (I) is new. An organometallic transition metal compound of formula (I) is new. [Image] M 1>elements of groups 3-6 of periodic table or lanthanides; X : organic or inorganic anionic monovalent ligand, with two radicals X may join to form divalent radical; n : 1-4 and is equal to oxidation state of M 1> minus 2; R 1>H, 1-40C radical unbranched in alpha -position or 1-40C radical bound via sp 2>-hybridized carbon atom; R 2>3-40C radical branched in alpha -position; R 3>(un)substituted 6-40C aryl radical or 2-40C heteroaromatic radical containing O, N, S and/or P; R 4>1-10C n-alkyl; R 4a>H or 1-10C n-alkyl; R 5>-R 8>H or 1-40C radical; and Z : bridge containing divalent atom or divalent group. Excluding the possibilities: dimethylsilanediyl(2,6-dimethyl-4-phenylindenyl)(2-isopropyl-4-phenylindenyl)zirconium dichloride, dimethylsilanediyl(2,6-dimethyl-4-phenylindenyl)(2-isopropylindenyl)zirconium dichloride and dimethylsilanediyl(2,5,6-trimethyl-4-phenylindenyl)(2-isopropyl-7-methylindenyl)zirconium dichloride. Independent claims are included for the following: (1) biscyclopentadienyl ligand system of formula (II) or its double bond isomer; (2) catalyst system containing the organometallic transition metal compound(s) and co-catalyst(s); (3) preparation of polyolefin which involves polymerizing or co-polymerizing olefin(s) in the presence of the catalyst system; (4) preparation of polypropylene/propylene-ethylene copolymer mixture using the catalyst system; (5) use of biscyclopentadienyl ligand system for preparation of organometallic transition metal compound; and (6) preparation of organometallic transition metal compound which involves reacting biscyclopentadienyl ligand system or bisanion with a transition metal compound. [Image] R 1>-R 8>, R 4a>, Z : as defined in formula (I).