- PROCESS FOR RECYCLING OF FREE LIGAND FROM THEIR CORRESPONDING METALLOCENE COMPLEXES
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An efficient and economical process to recover ligands from metallocene complexes, where the free ligand recovered may be recycled to produce additional metallocene and metallocene complexes. The process comprises contacting a metallocene complex comprising a ligand with a protic composition under reaction conditions to decompose the metallocene complex and form a reaction product comprising free ligand and inorganic decomposition products; and recovering the free ligand from the reaction product
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Paragraph 0074-0076
(2013/04/10)
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- Metallocene compounds, catalysts comprising them, process for producing an olefin polymer by use of the catalysts, and olefin homo- and copolymers
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Certain metallocene compounds are provided that, when used as a component in a supported polymerization catalyst under industrially relevant polymerization conditions, afford high molar mass homo polymers or copolymers like polypropylene or propylene/ethylene copolymers without the need for any α-branched substituent in either of the two available 2-positions of the indenyl ligands. The substituent in the 2-position of one indenyl ligand can be any radical comprising hydrogen, methyl, or any other C2-C40 hydrocarbon which is not branched in the α-position, and the substituent in the 2-position of the other indenyl ligand can be any C4-C40 hydrocarbon radical with the proviso that this hydrocarbon radical is branched in the β-position. This metallocene topology affords high melting point, very high molar mass homo polypropylene and very high molar mass propylene-based copolymers. The activity/productivity levels of catalysts including the metallocenes of the present invention are exceptionally high.
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Page/Page column 62-63
(2012/11/07)
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- METALLOCENE COMPOUNDS, CATALYSTS COMPRISING THEM, PROCESS FOR PRODUCING AN OLEFIN POLYMER BY USE OF THE CATALYSTS, AND OLEFIN HOMO-AND COPOLYMERS
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Certain metallocene compounds are provided that, when used as a component in a supported polymerization catalyst under industrially relevant polymerization conditions, afford high molar mass homo polymers or copolymers like polypropylene or propylene/ethylene copolymers without the need for any α-branched substituent in either of the two available 2-positions of the indenyl ligands. The substituent in the 2-position of one indenyl ligand can be any radical comprising hydrogen, methyl, or any other C2-C40 hydrocarbon which is not branched in the α-position, and the substituent in the 2-position of the other indenyl ligand can be any C4-C40 hydrocarbon radical with the proviso that this hydrocarbon radical is branched in the β-position. This metallocene topology affords high melting point, very high molar mass homo polypropylene and very high molar mass propylene-based copolymers. The activity/productivity levels of catalysts including the metallocenes of the present invention are exceptionally high.
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- Indenyl-amido titanium and zirconium dimethyl complexes: Improved synthesis and use in propylene polymerization
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The synthesis of a series of indenyl amido titanium dimethyl complexes, by means of the direct synthesis from the ligand, a 2-fold excess of MeLi, and TiCl4 is reported. The 1H NMR spectra of the complexes show a quartet structure for the metal-bound methyl groups, due to through-metal proton-proton coupling. Coupling of Ti-methyl protons with protons on the Cp ring is also revealed by COSY 2D-NMR. The performance of the Ti complexes in propylene polymerization, including [Me2Si(Me4C5)(t-BuN)]TiMe2 (1-TiMe2), [Me2Si(Ind) (t-BuN)]TiMe2(2-TiMe2) and six other methyl titanium complexes bearing substituted indenyl ligands, has been investigated with different cocatalysts and at different polymerization temperatures and propylene concentrations. All complexes produce amorphous polypropylene (am-PP). The catalytic activity and molecular weight strongly depend on the substitution of the Cp ring: 2-TiMe2 gives polymers of lower molecular weight, while the presence of a methyl group in position 2 (as in 3-TiMe2) determines up to 4-fold increase in molecular weight. The type of cocatalyst influences mainly the catalytic activity, the borates being better activators than MAO, but also molecular weight, with again the borates giving higher molecular weights than MAO. ΔΔE? 2-TiMe2 = 3.4 kcal mol-1, ΔΔE? 5-TiMe2 = 3.8 kcal mol-1, ΔΔE? 3-TiMe2 = 6.3 kcal mol-1. Even if all the polymers produced are amorphous, 2-TiMe2 and 5-TiMe2 show a microstructure unbalanced towards isotacticity, while 3-TiMe2, 6-TiMe2 and 8-TiMe2 are syndiotactic-enriched. Chiral induction comes mainly from a weak enantiomorphic site control.
- Resconi, Luigi,Camurati, Isabella,Grandini, Cristiano,Rinaldi, Marilisa,Mascellani, Nicoletta,Traverso, Orazio
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- Silyl amines
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Silyl amine compounds which have a proton available for covalent bonding to a metallocene metal center are disclosed.
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- Silylated and N-silylated compound synthesis
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Novel silanes having the formula (RSO3)2-Si-Q2.0.5HX are described. Synthesis of silylated bis-cyclopentadienyl and N-silylated mono(cyclopentadienyl) ligands and similar indenyl ligands utilizing the novel silanes is described.
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- Process for the preparation of substituted indenes and their use as ligand systems for metallocene catalysts
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The invention relates to a process for the preparation of a compound of the formula IV or IVa STR1 in which R1 -R5 are preferably hydrogen or alkyl, which comprises reacting a compound I STR2 with a compound II STR3 in which X1 and X2 are preferably halogen, to give the corresponding indanones, which are converted into the compounds IV and IVa by reduction and dehydration. The compounds IV and IVa are important intermediate products for the preparation of chiral metallocene complexes which are suitable catalyst components for olefin polymerization.
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