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6713576 |
Olefin polymerization catalysts based on convex, polcyclic ligands
A catalyst system useful for polymerizing olefins is disclosed. The catalyst system includes an organometallic complex that incorporates a Group 3 to 10 transition metal and an anionic, polycyclic,...
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6713426 |
Metallocene capable of being used for the process for the preparation of a syndiotactic polyolefin
A syndiotactic polyolefin is obtained in a high yield by polymerization or copolymerization of an olefin of the formula R a —CH═CH—R b in the presence of a catalyst consisting of a...
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6693153 |
Catalyst system for the polymerization of alkenes to polyolefins
The invention provides metallocene catalyst systems for the controlled polymerization of alkenes to a wide variety of polyolefins and olefin coplymers. Catalyst systems are provided that...
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6686488 |
Constrained geometry addition polymerization catalysts
Metal complexes having constrained geometry and a process for preparation thereof, addition polymerization catalysts formed therefrom, processes for preparation of such addition polymerization...
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6673880 |
Bridged zirconocene compounds, process for their preparation and their use as catalyst components in the polymerization of olefins
Zirconocene compounds with two indenyl ligands linked in the 2 position by means of a two-carbon-atoms divalent bridging group can be suitably used as components of catalysts for the polymerization...
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6657027 |
Catalysts with a donor-acceptor interaction
The present invention relates to compounds in which a transition metal is complexed with two ligand systems and the two systems are reversibly bonded together by at least one bridge consisting of a...
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6653431 |
Low density polyolefin
Use of a catalyst system comprising a metallocene catalyst component of general formula R″ (CpR n )(Cp′R′ n )MQ 2 supported on an inert support in the slurry phase production of linear low...
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6642400 |
Linked metallocene complexes, catalyst systems, and olefin polymerization processes using same
Disclosed are metallocene complexes containing two or more metallocene components where the components may be independently bridged or unbridged. In particular, the invention provides metallocene...
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6635779 |
Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefins
A class of metallocene compounds is disclosed having general formula (I) wherein Y is a moiety of formula (II) wherein A, B, and D, same or different from each other, are selected from an element...
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6630546 |
Process for the preparation of a polyolefin
Use of a catalyst system comprising a metallocene catalyst component of general formula R″(CpR m ) (Cp′R′ n )MQ 2 supported on an inert support in the slurry phase production of linear low...
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6620953 |
Method for producing monoaryloxy-ansa-metallocenes
The present invention relates to a process for preparing monoaryloxy-metallocenes of the formula (II), which comprises reacting a ligand starting compound of the formula (III) with a transition...
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6617407 |
Bis(n,n-dihydrocarbylamino)-substituted cyclopentadienes and metal complexes thereof
This invention relates to bis(N,N-dihydrocarbylamino)-substituted derivatives of cyclopentadienes (Cp) and metal complexes thereof which find utility as olefin polymerization catalyst components.
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6617466 |
Monocylopentadienyl transition metal olefin polymerization catalysts
The invention is a catalyst system including a Group IV B transition metal component and an alumoxane component which may be employed to polymerize olefins to produce a high molecular weight polymer.
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6613713 |
Organometallic compounds with fused indenyl ligands
The present invention relates to transition metal organometallic compounds with an indenyl ligand attached in position 2 and fused in position 5,6, to a process for the production thereof and to...
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6610872 |
Process for preparing polysilane by catalytic dehydrogenative condensation of organosilane and metal complex catalyst therefor
A polysilane is produced by subjecting a trihydrosilane to hydrogenative condensation in the presence of a titanium or zirconim complex catalyst having a first group selected from a...
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6590114 |
Conversion of cyclopentadienyl silyl amines to organometallic complexes comprising titanium bisalkoxy moiety or titanium dichloride moiety
Conversion of cyclopentadienyl or indenyl compounds to titanium organometallic complexes by treatment with titanium tetraalkoxides is described.
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6583304 |
Metallocene compounds, metallocene catalysts including the compounds and methods of polymerizing olefins with the catalysts
There are disclosed new metallocene compounds and catalysts for olefin polymerization. The metallocene compound is a complex of transition metal and cyclopentadienyl-type ligands substituted with...
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6579998 |
Stereospecific living polymerization of olefins by a novel Ziegler-Natta catalyst composition
An olefin polymerization pre-catalyst and a method for preparing an activated olefin polymerization catalyst composition from the pre-catalyst are disclosed: wherein M, R 1 , R 2 , R 3 , R 4 ...
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6566544 |
Catalysts for thermoplastic elastomeric olefin polymers
This invention is directed to novel catalysts the structure and activity of which can be controlled to produce a wide range of alpha olefin polymers and co-polymers, and preferably for the...
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6559089 |
Metallocene catalyst component for use in producing isotactic polyolefins
Provided is a metallocene catalyst component for use if preparing isotactic polyolefins, which component has the general formula (I): R″ (CpR 1 R 2 R 3 )(Cp′R′n) MQ 2 wherein Cp is a...
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6552210 |
Transition metal compound containing cationic groups which is used as an olefin polymerization catalyst component
Specifically substituted metallocenes can be used in the polymerization of olefins. The novel compounds contain a cationic group as substituents and are suitable as constituents of a catalyst...
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6537943 |
Catalyst system composed of metallocenes comprising substituents containing fluorine
The invention relates to a catalyst system composed of metallocenes comprising substituents containing fluorine, a method for producing said system and its use for the polymerization of olefins.
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6534665 |
Single-carbon bridges bys cyclopentadienyl compounds and metallocene complexes thereof
The present invention relates to metallocenes, wherein the two cyclopentadienyl rings are connected to each other by a single carbon atom characterized by the following general formula III where...
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6531554 |
Metallocycle metallocenes and their use
Metallocycle metallocenes are produced by reacting a first metallocene having an aralkyl group or an aryl dialkyl silyl group attached to a cyclodienyl group with about two molar equivalents of an...
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6528449 |
Three coordinate aluminum catalyst activator composition
Catalyst compositions useful for olefin polymerizations comprising a Group 3-10 metal complex and a compound corresponding to the formula: AlAr f Q 1 Q 2 , or a dimer, adduct, or mixture thereof...
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6518378 |
High-melting polyolefin copolymer elastomers, catalysts and methods of synthesis
This invention relates to high melting polyolefin copolymers suitable as thermoplastic elastomers and catalysts and methods for their synthesis. These elastomeric olefin copolymers are...
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6509426 |
Transition metal compound, catalyst component for olefin polymerization and process for the preparation of α-olefin polymer
Disclosed are a novel transition metal compound represented by the following general formula (I), a catalyst component for olefin polymerization comprising same, a catalyst for olefin...
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6506919 |
Metallocene compounds and their use for olefin polymerization
The present invention relates to a metallocene compound and the olefin polymerization using the same, particularly to a metallocene compound and the olefin polymerization using this compound on...
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6500949 |
Bridged metal complexes
An improved process for forming bridged Group 4 transition metal complexes using boron trihalide and a magnesium dicyclopentadienyl compound to form a dicyclopentadienyl boron halide intermediate...
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6492294 |
Transition metal compound, olefin polymerization catalyst component, olefin polymerization catalyst and process for producing olefin polymer
A specified transition metal compound having two transition metals and two cyclopentadiene type anion skeletons in its molecule and said metals are linked through an atom of Group XVI of the...
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6486277 |
Zwitterionic transition metal compound which contains boron
A boron-containing zwitterionic neutral transition metal compound which can advantageously be used for the polymerization of olefins is described. Here, the use of aluminoxanes, such as...
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6482967 |
Metallocenes, polymerization catalyst systems, their preparation, and use
Metallocenes having a 9-fluorenyl group and another cyclic dienyl group connected by a single carbon having a terminally unsaturated hydrocarbyl substituent wherein the 9-fluorenyl group has a...
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6482966 |
Crosslink-cyclized cyclopentadiene and dihalobis type metal compound containing same as ligand
A process for producing a crosslink-cyclized cyclopentadiene, comprising the steps of reacting a cyclopentenone with an alkali metal hydride to thereby reduce the cyclopentenone (reduction step A)...
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6479424 |
Fluxional catalysts and related ligands containing bulky substituents
A ligand useful to form a metallocene olefin polymerization catalyst comprises: wherein at least R 3 and R 4 are substituents having at least a bulk of a t-butyl group and, optionally, wherein...
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6479685 |
Metallocene catalysts for synthesis of high-melting polyolefin copolymer elastomers
Metallocene catalysts having plural coordination geometries for synthesis of high melting polyolefin copolymers suitable as thermoplastic elastomers. The inventive catalysts comprise unbridged,...
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6479423 |
Process for the preparation of a polyolefin
Process for the preparation of a polyolefin Olefins of the formula R 11 —CH═CH—R 12 (R 11 , R 12 =H or C 1 -C 14 -alkyl) are polymerized in the presence of a catalyst consisting of at least...
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6475947 |
Oligomeric metallocenes and their use
A process for producing a new metallocene comprising reacting a first bridged metallocene which has an olefinically unsaturated with about two molar equivalents of an alkali metal alkyl, catalyst...
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6469114 |
Metallocene compound and polymerization catalyst comprising heterocyclic group
Disclosed are compounds of the following core structure, and their use as polymerization catalysts: wherein M 1 is a group lVb transition metal, R 5 is a substituted aryl group, and R a forms...
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6465667 |
Synthesis and isomerization of 1,2-bis (indenyl) ethanes
A method for producing 1,2-bis(indenyl)ethanes in good yield is described. An agent and its application for isomerizing kinetic EBI to thermodynamic EBI and for isomerizing meso TMS-EBI to rac...
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6465384 |
Biscyclopentadienyl diene complexes
Biscyclopentadienyl, Group 4 transition metal complexes formed with conjugated dienes wherein the diene is bound to the transition metal either in the form of a σ-complex or a π-complex in...
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6458982 |
Transition metal compound, catalyst, its production and its use for the polymerization of olefins
Metallocene catalysts for the preparation of polyolefins, in particular polypropylene having elastomeric properties, having specific heteroaromatics in position 2 or 3 of the indenyl system....
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6452031 |
Preparation of titanium organometallic complexes comprising a titanium bisalkoxide or dihalide moiety
Conversion of a ligand of titanium organometallic complex to a titanium bisalkoxy or a titanium dichloride is described.
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6451724 |
Metallocenes and catalysts for olefin-polymerisation
A class of metallocenes of formula (I): (ZR 1 m ) n (Cp)(A) r ML p L′ q (I) wherein (ZR 1 m ) n , is a divalent group bridging Cp and A, Cp is a heterocyclic cyclopentadienyl group of formula...
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6448424 |
Tetrahydrofluorenyl containing group 4 metallocenes useful as catalysts for the polymerization of olefins, process for their preparation and use of said metallocenes for the polymerization of olefins
Novel silylene or ethylene bis(tetrahydrofluorenyl)metallocenes are synthesized and used as olefin polymerization catalysts.
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6448358 |
Elastic polypropylenes and catalysts for their manufacture
A propylene polymeric composition with elastic character that is soluble in at least one nonpolar organic solvent selected from the group consisting of toluene, xylene, heptane, and hexane,...
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6440890 |
Hydrocarbyl phosphinimine/cyclopentadienyl complexes of group IV metals and preparation thereof
New group 4 organometallic complexes are characterized by having a phosphinimine ligand and two or more cyclopentadienyl ligands. Certain of these complexes exhibit unusual behavior when examined...
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6433112 |
&pgr -complex compounds
The invention relates to novel π-complex compounds of transitional metals. The novel π-complex compounds are suitable for use as catalysts for the (co)polymerization of olefins, cyclo-olefins,...
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6433203 |
Bridged metallocenes, preparation, use in catalytic systems
Metallocene compounds having the general formula (I): R 1 are hydrocarbon groups, R 2 are hydrogen or hydrocarbon groups; M is a transition metal of group 3, 4, 5, 6 or to the lanthanide or...
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6426426 |
Procedure for the preparation of aromatic derivatives of titanocene
Procedure for the preparation of aromatic derivatives of titanocene, useful as catalysts for the polymerisation and hydrogenation of polymers, characterised by the use of a Grignard reagent. This...
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6426395 |
&mgr -oxo-bis-metallocene complex compounds and catalysts using same for the polymerization of olefins as well as polymerization process
Disclosed are μ-oxo-bis-metallocene complex compounds, catalysts for the polymerization of olefins comprising a μ-oxo-bis-metallocene complex compound and at lease one cocatalyst selected from...
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