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7601666 |
Olefin polymerization catalyst system and process for use thereof
A compound represented by the formula:
where:
M is a transition metal selected from group 4 of the periodic table; each R 1 is independently selected from the group consisting of...
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7592404 |
Half metallocene catalyst and process for preparing syndiotactic styren polymer using the same
The present invention relates to a transition metal half metallocene catalyst with a noble structure for preparing syndiotatic styrene polymer having high activity, superior stereoregularity, high...
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7592401 |
Multinuclear half metallocene catalyst and method for preparing syndiotatic polystyrene using the same
Disclosed is a multinuclear transition metal half metallocene catalyst having a multinuclear half metallocene structure in which a transition metal of groups 3 to 10 on periodic table is connected...
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7569651 |
Transition metal compound, ligand system, catalyst system and its use for the polymerization and copolymerization of olefins
A process for the polymerization of olefins, in particular a process for the copolymerization of propylene with further olefins, is carried out in the presence of highly active catalyst systems...
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7569647 |
Process for the copolymerization of ethylene
A process for producing a copolymer of ethylene containing from 0.1 to 99% by mol of one or more derived units of alpha-olefins of formula CH 2 ═CHA, wherein A is a C 2 -C 20 alkyl radical,...
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7569646 |
Group IVB transition metal compounds
The invention is a Group IVB transition metal compound which may be employed in the polymerization of olefins to produce high molecular weight polymers.
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RE40751 |
Polymerization catalyst systems comprising substituted hafnocenes
The present invention relates to a process for the polymerization of monomers utilizing a bulky ligand hafnium transition metal metallocene-type catalyst compound, to the catalyst compound itself...
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7511184 |
Molecular sieve catalyst composition, its making and use in conversion processes
The invention relates to a molecular sieve catalyst composition, to a method of making or forming the molecular sieve catalyst composition, and to a conversion process using the catalyst...
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7470758 |
Polymerization catalysts for producing polymers with low levels of long chain branching
This invention relates to catalyst compositions, methods, and polymers encompassing a Group 4 metallocene with bridging η 5 -cyclopentadienyl-type ligands, in combination with a cocatalyst and an...
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7459510 |
Polymerization process
This invention relates to a process to polymerize olefins comprising contacting, in a reactor, a pyridyl-di-imine compound and an activator with one or more olefin monomer(s) in the presence of a...
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7449527 |
Polyolefin production
Provided is a process for producing a polyolefin having a multimodal molecular weight distribution, which process comprises: (a) polymerizing a first olefin monomer in the presence of an...
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7442750 |
Supported olefin polymerization catalyst
Supported catalyst systems are provided comprising (a) a transition metal compound, (b) an activator comprising (iii) an aluminoxane or (iv) a Group lilA metal or metalloid compound, and (c) a...
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7417097 |
Organometal compound catalyst
This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for...
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7396888 |
Catalyst system comprising a mixture of catalyst components for producing a polyolefin blend
Provided is a catalyst system for producing a polyolefin blend, which catalyst system comprises a mixture including the following catalyst components: i) a catalyst component A capable of producing...
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7365137 |
Multistep process for the (co) polymerization of olefins
A multistep process for the polymerization of one or more olefins comprising a first step of polymerizing one or more of said olefins in the presence of a catalyst of the Ziegler-Natta type, a step...
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RE40234 |
Process for producing crystalline poly-α-olefins with a monocyclopentadienyl transition metal catalyst system
The invention is a catalytic process using a Group IV B transition metal component and an alumoxane component to polymerize α-olefins to produce high crystallinity and high molecular weight...
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7335710 |
Polymerization process
A process for the polymerisation of olefins is described involving the use of a catalyst system comprising a supported transition metal compound and an activator based on an organoborane and an...
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7326756 |
High temperature bulk polymerization of branched crystalline polypropylene
Branched crystalline polypropylene compositions and methods for the preparation of branched crystalline polypropylene compositions are provided. For example, described herein is a process of...
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7323526 |
Supported metallocene-alkyl catalyst composition
A supported catalyst composition having improved flow properties is disclosed comprising an alkylalumoxane, a metallocene-alkyl an inorganic oxide support having an average particle size of from...
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7319125 |
Supercritical polymerization process and polymers produced therefrom
This invention relates to a process to produce propylene polymers comprising contacting a metallocene catalyst compound and an activator in a reaction medium comprising propylene, from 0 to 30...
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7312283 |
Polymerization catalysts and process for producing bimodal polymers in a single reactor
Catalyst compositions comprising a first metallocene compound, a second metallocene compound, an activator-support, and an organoaluminum compound are provided. Methods for preparing and using such...
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7294680 |
Method of producing conjugated diene polymers with narrow molecular weight distribution and polymer produced
Conjugated diene polymers having good wear resistance, mechanical properties, storage stability, processability and a reduced cold flow are produced by polymerizing a conjugated diene compound with...
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7288598 |
Polyolefin masterbatch for preparing impact-resistant polyolefin articles
A masterbatch composition comprising (1) 10-50 wt % of a crystalline propylene homopolymer and (2) 50-90 wt % of a blend consisting of (a) a copolymer of ethylene and one or more C4-CIO...
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7271226 |
Olefin polymerisation process
A process for the homopolymerisation of ethylene or the copolymerisation of ethylene and (a-olefins in a polymeristation reactor, said process carried out in the presence of a catalyst system...
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7259215 |
Process for producing propylene/ethylene block copolymer and propylene/ethylene block copolymer
A process for producing a propylene-ethylene block copolymer in a good morphology using a catalyst system comprising a metallocene catalyst (1) preparing high crystalline polypropylene, a...
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7205427 |
Cross-coupling synthesis of alkyl (dialkylphenyl) indenes
A cross-coupling synthesis of 2-alkyl-4-(2,6-dialkylphenyl)indenes is described. A 2-alkylidene is treated with a dialkylboronic acid in the presence of a catalyst. A feature of the invention is...
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7205364 |
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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7199163 |
Method for removing volatile components from polymer compositions
Method for continuously removing the unreacted butene-1, and optionally other volatile components, from a polymeric solution obtained by liquid phase (co)polymerization of butene-1, the method...
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7169863 |
Salts of lewis acid/acid adducts and catalyst activators therefrom
A compound useful as a cocatalyst or cocatalyst component, especially for use as an addition polymerization catalyst compound, corresponding to the formula: (A* +a ) b (Z*J* j ) −c d , wherein:
...
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7157530 |
Catalyst system for controlled polymerization
Disclosed is a process for the removal and recycle of a supported transition metal catalyst complex from a polymerization reaction medium comprising the steps separating the supported transition...
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7157522 |
Alpha-olefin/propylene copolymers and their use
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable...
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7141690 |
Transition metal complexes, ligands, polymerization catalysts for olefins, and process for production of olefin polymers
A transition metal complex represented by the formula (1):
wherein M is a Group 4 transition metal, A is a Group 16 element, B is a Group 14 element, n is an integer of 0 or 1, R 1 , R 2 , R 3 ...
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7141639 |
Ethylene copolymer
An object of the present invention is to provide an ethylene-α-olefin copolymer excellent in extrusion molding processability and in the balance between the appearance and impact strength. This...
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7141632 |
Mixed metallocene catalyst systems containing a poor comonomer incorporator and a good comonomer incorporator
The present invention provides polymerization catalyst compounds, catalyst systems including these catalyst compounds, and to their use in the polymerization of ethylene and at least one comonomer....
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7132502 |
Water-thinnable polymer precursors, their preparation and use
The present invention is directed towards water-thinnable phosphorous-containing polymers precursors, their preparation and use. The precursors of the invention are useful in compositions for...
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7122603 |
Alpha-Olefin/propylene copolymers and their use
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable...
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7122498 |
Metallocenes and catalyst compositions derived therefrom
Metallocenes and catalyst systems for olefin polymerization derived therefrom. The metallocenes may be represented by the formula:
wherein M 1 preferably is zirconium or hafnium; and R 12...
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7119153 |
Dual metallocene catalyst for producing film resins with good machine direction (MD) elmendorf tear strength
This invention relates to catalyst compositions comprising a first metallocene compound, a second metallocene compound, at least one chemically-treated solid oxide, and at least one organoaluminum...
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7115688 |
Nanoparticles with polymer shells
The invention provides a method of preparing nanoparticles having at least one polymer shell attached to them, each polymer shell having a selected property or properties. The method comprises...
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7105609 |
Alpha-olefin/propylene copolymers and their use
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable...
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7091272 |
Olefin polymerization with pyridine moiety-containing single-site catalysts
An olefin polymerization process is disclosed. The polymerization is performed in the presence of a clay, an activator, and a transition metal complex that has at least one pyridine...
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7084218 |
Thermoplastic polymer blends of isotactic polypropylene and alpha-olefin/propylene copolymers
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable...
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7077977 |
Bulky borate activations
A discrete polyolefin catalyst activator is disclosed. A salient feature of invention borate-based activators is that at least one of the ligands on the borate non-coordinating anion (NCA)...
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RE39156 |
Process for the preparation of polyolefins
A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula R a —CH═CH—R b , in which R a and R b are identical or different and are...
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7060765 |
Low comonomer incorporating metallocene catalyst compounds
The present invention provides polymerization catalyst compounds, catalyst systems including these catalyst compounds, and to their use in the polymerization of ethylene and at least one comonomer....
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7056994 |
Catalyst composition
The present invention relates to a catalyst composition for polymerization of a conjugated diene, comprising: (A) a metallocene-type complex represented by a general formula (I): (C 5 R 1 R 2 R 3 R...
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7056993 |
Process for producing propylene alpha-olefin polymers
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable...
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7056992 |
Propylene alpha-olefin polymers
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable...
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7053164 |
Thermoplastic polymer blends of isotactic polypropropylene and alpha-olefin/propylene copolymers
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable...
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7049453 |
“Constrained geometry” metallocenes, method for the production thereof and use of the same for the polymerisation of olefins
The present invention relates to a process for preparing specific transition metal compounds, novel transition metal compounds and also catalyst systems and their use for the homo- or...
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