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6642327 |
Late transition metal complexes, their use as catalysts and polymers therefrom
The invention provides a novel metal complex which, when used with an activating cocatalyst, provides a novel catalyst composition. The invention also provides a polymerization method which...
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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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6642325 |
Silica gel-supported catalyst component for ethylene (co)polymerization, catalyst therefrom and use of the same
The present invention relates to a silica gel-supported catalyst component suitable for ethylene (co)polymerization, a catalyst therefrom and use of the same. The catalyst component according to...
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6642340 |
Process for preparing an ethylene/α-olefin copolymer
A process for preparing an ethylene/α-olefin copolymer, which includes the steps of (A) copolymerizing ethylene and an α-olefin of 3 to 20 carbon atoms by continuous vapor phase polymerization;...
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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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6635734 |
Catalyst system to produce highly crystalline polypropylene
The present invention provides polypropylene having xylene solubles from 0.6 to 1.5 weight percent and isotacticity equal to or greater than about 98.0 percent. The polypropylene is obtained by...
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6632959 |
Basic catalysts and process for producing carbonyl compound derivatives
A base catalyst, obtained by formulating at least one alkali metal compound selected from the group consisting of alkoxides, hydroxides and oxides of alkali metals and an alkaline-earth metal oxide...
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6630544 |
Propylene polymerization process with enhanced catalyst activity
A process for polymerizing propylene is disclosed. The process involves charging propylene and about 90 to 99% of an organoaluminum cocatalyst to a reactor and heating this mixture to at least...
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6630550 |
Olefin polymerization catalyst
A catalyst for olefin polymerization of the formula: R″(C 4 R′ m C 5 C 4 R′ n )XMeQ wherein X is an hetero atom ligand with one or two lone pair electrons selected from the elements of Group...
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6627710 |
Catalyst components for the polymerization of olefins and catalysts therefrom obtained
The invention relates to catalyst components, suitable for the preparation of homopolymers and copolymers of ethylene having a broad molecular weight distribution (MWD), which comprise Ti, Mg, Cl,...
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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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6617403 |
Olefin polymerization process
A copolymer of ethylene and a higher alpha-olefin having broadened melt processing windows and reduced melt fracture can be produced using a chromium-containing catalyst system and a trialkyl boron...
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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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6613851 |
Catalyst for the polymerization of olefins
The invention relates to the use of cyclic carbene-η-ligand complexes for catalysis of olefin polymerization.
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6613712 |
Organometal catalyst compositions with solid oxide supports treated with fluorine and boron
The invention provides for compositions that are useful for polymerizing at least one monomer to produce a polymer, wherein the composition comprises a post-contacted organometal compound, a...
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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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6608000 |
Polymerization catalysts, their production and use
The invention generally relates to a metallocene-based, olefin polymerization catalyst system. The easily processible polymer product has a broad molecular weight distribution, a high molecular...
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6596890 |
Aluminum alkyl complexes as cocatalysts
Organometallic aluminum compounds of the general formula (I) where X 1 is NH, NH 2 *, NH—A*, N—A, N(A) 2 *, O, OA*, O-Aryl*, S, SA*, P, P(A) 2 * or a single bond, X 2 is NH, N—A, O, S,...
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6596826 |
Olefin polymerization catalysts containing 1,3-diboretanyl ligands
An olefin polymerization catalyst system and method of making it are disclosed. The catalyst system comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10...
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6596891 |
Activating composition of metallocene complexes in the catalysis of (co)polymerization processes of olefins
An organometallic composition of a reaction product of a fluorinated organic compound of formula (I): wherein R 1 to R 8 are as described in the specification, m is 0 or 1; and an...
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6596827 |
Method for catalytic polymerization of alpha-olefin monomers using an ultra-high activity non-metallocene pre-catalyst
Disclosed are olefin polymerization methods comprising the use of the following compounds: wherein M is a metal atom, R 1 -R 8 are univalent radicals, X 1 and X 2 are univalent ligands, X 3 ...
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6593266 |
Olefin polymerization catalyst and polymerization process
An olefin polymerization catalyst having an excellent polymerization activity and an olefin polymerization process using the catalyst are disclosed. The olefin polymerization catalyst comprises (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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6586545 |
Complexes based on four-membered cyclic anionic six-electron-donor ligands
A single-site olefin polymerization catalyst and method of making it are disclosed. The catalyst comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10...
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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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6583238 |
Catalyst system, method for the production thereof, and the utilization thereof for the polymerization of olefins
A catalyst system with at least one specifically substituted metallocene which contains a cationic group as a substituent, a process for preparing such a catalyst system and its use in the...
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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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6579957 |
Single-site catalysts based on anionic thiopyran dioxide ligands
Single-site catalysts useful for polymerizing olefins are disclosed. The catalysts incorporate a Group 3 to 10 transition, lanthanide, or actinide metal and an anionic thiopyran dioxide ligand....
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6576726 |
Catalyst combination and a process for preparing linear, isotatic polymers
The invention concerns a metallocene catalyst composition for preparing linear isotactic polymers, wherein said catalyst composition contains a metal complex and an activator. The invention also...
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6576727 |
Catalyst system for gas phase polymerization of conjugated dienes
The present invention relates to a catalyst system for gas phase polymerization of conjugated dienes, consisting of a rare earth compound, an aluminum organic compound, a further Lewis acid,...
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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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6562750 |
Catalyst for the production of olefin polymers
A catalyst composition for the polymerization of olefins is provided, comprising a bis(hydroxy aromatic nitrogen ligand) transition metal catalyst precursor and an activating cocatalyst.
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6562921 |
Catalyst precursor compound and olefin polymerization process using same
A catalyst precursor compound useful for the polymerization of olefins. The compound comprises a metal atom and two π-bonded aromatic ring systems which are bridged by being linked to adjacent...
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6562918 |
Olefin polymerization catalyst, method for producing the same and method for producing olefinic polymer
A catalyst for olefin polymerization, which is obtained by contacting (A) a compound of a transition metal of Groups 4 to 6 of the Periodic Table, (B) an organoaluminiumoxy compound, and optionally...
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6559249 |
Catalyst for producing an ultrahigh molecular weight polyethylene (UHWMP) and method for producing an UHWMP using the same
The present invention provides a catalyst for producing an ultra high molecular weight polyethylene and also a method for preparation of an ultra high molecular weight polyethylene with the use of...
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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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6559251 |
Process for making low-density polyolefins
A process for making ethylene copolymers is disclosed. Ethylene copolymerizes with an α-olefin in the presence of a catalyst system comprising an activator and a silica-supported, bridged...
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6559250 |
Method of homo- or co-polymerization of α-olefin
The present invention relates to a method of homo- or co-polymerization of α-olefin by means of using a catalyst system which comprises the following components: (1) a solid complex titanium...
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6559088 |
Ziegler-Natta catalyst with amine for polymerization
Provided is a catalyst system for polymerization of monomer having at least one Ziegler-Natta polymerizable bond comprising: c) a supported Ziegler-Natta transition metal catalyst component...
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6555494 |
Transition metal compounds having conjugate aluminoxate anions, their preparation and their use as catalyst components
Novel, highly effective catalyst compositions are described in which a low cost co-catalyst can be employed at very low aluminum loadings. Such compounds are composed of a cation derived from...
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6555634 |
Di- and tri-heteroatom substituted indenyl metal complexes
Novel metal complexes containing at least two heteroatoms attached to an indenyl or substituted indenyl radical which is bridged by ligand group thereby forming a covalent or coordinate/covalent...
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6552136 |
Organosilicon compound, catalyst for olefin polymer production, and method for producing olefin polymer
Provided are a catalyst for olefin polymer production, which contains an organosilicon compound having a specific structure and with which olefin polymers produced have increased stereospecificity...
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6551957 |
Catalyst composition and methods for its preparation and use in a polymerization process
The present invention relates to a catalyst composition and a method for making the catalyst composition of a polymerization catalyst and a carbonyl compound. The invention is also directed to the...
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6548442 |
Organometal compound catalyst
This invention is directed to an organometal compound catalyst that is useful for polymerizing at least one monomer to produce a polymer. The catalyst is produced by combining a titanium, zirconium...
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6548441 |
Organometal catalyst compositions
This invention provides a catalyst composition for polymerizing at least one monomer to produce a polymer, wherein said catalyst composition comprises an organometal compound, an organoaluminum...
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6544918 |
Olefin polymerization catalysts containing chelating dianionic ligands
A catalyst system useful for polymerizing olefins is disclosed. The catalyst system comprises an activator and a complex that incorporates a Group 3 to 10 transition metal and at least one...
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6545106 |
Process for the polymerization of olefines
Process for the polymerization of olefins, according to which at least one olefin is placed in contact with a catalytic system comprising: a) a solid catalytic complex based on magnesium,...
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6544921 |
Solid catalyst component and catalyst for olefin polymerization, process for producing olefin polymer and process for producing solid catalyst component for olefin polymerization
There are provided: (I) a solid catalyst component (A-1) for olefin polymerization, which is obtained by a process comprising the step of contacting: (a-1) a carrier of carboxyl group-carrying...
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6541584 |
Bis(tetrahydro-indenyl) metallocenes as olefin-polymerization-catalyst
A new class of bridged bis(tetrahydro-indenyl)metallocenes of formula (I), wherein M is Zr or Hf; X are monoanionic sigma ligands; (ZR 1 i ) j is a divalent group bridging the two...
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6541659 |
Process for acyl substitution of anhydride by vanadyl salt catalyst
A process for acyl substitution of an anhydride with an active-hydrogen-containing compound includes reacting the anhydride with the active-hydrogen-containing compound in the presence of a vanadyl...
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