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7619047 |
Dual metallocene catalysts for polymerization of bimodal polymers
This invention relates to catalyst compositions, methods, and polymers encompassing at least one first Group 4 metallocene compound comprising bridging η 5 -cyclopentadienyl-type ligands, in...
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7601787 |
Ethylene polymerization process
A process for polymerizing ethylene is disclosed. The polymerization is performed in the presence of a Ziegler-Natta catalyst system in two slurry reaction zones. Most of the polyethylene (70-95...
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7566677 |
De-foaming spray dried catalyst slurries
A method for preparing a spray dried catalyst and a low viscosity, low foam spray dried catalyst system for olefin polymerization are provided. In one aspect, the method includes preparing a...
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7517940 |
Catalyst composition including transition metal complexes and olefin polymerization using the same
Provided is catalyst composition including a transition metal complex precatalyst represented by Formula 1; a first cocatalyst represented by Formula 2 which is an alkylaluminum compound; and a...
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7479529 |
Fluoralcohol leaving group for non-metallocene olefin polymerization catalysts
A catalyst composition and method for olefin polymerization are provided. In one aspect, the catalyst composition is represented by the formula α a β b γ g MX n wherein M is a metal; X is a...
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7439312 |
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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7410926 |
Polymerization process using a supported, treated catalyst system
The present invention relates to a supported, treated catalyst system and its use in a process for polymerizing olefin(s). More particularly, it provides a supported, treated catalyst system...
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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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7323524 |
Tandem tetramerisation-polymerisation of olefins
The invention provides a process for polymerising olefins to branched polyolefins in the presence of a polymerisation catalyst and a cocatalyst, wherein the cocatalyst produces 1-octene in a...
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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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7294681 |
Mutliple catalyst system for olefin polymerization and polymers produced therefrom
This invention relates to a polymer of one or more C3 to C40 olefins, optionally one or more diolefins, and less than 15 mole % of ethylene, and polymerization processes for producing the same.
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7294600 |
Supported hybrid metallocene catalyst, method for preparing the same, and method for preparing polyolefin using the same
The present invention relates to a supported metallocene catalyst used for preparing polyolefin whose physical properties and molecular weight distribution can be easily controlled, a method for...
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7229943 |
Polymerisation and oligomerisation catalysts
A polymerisation catalyst comprising (1) a transition metal compound of Formula A,
and optionally (2) an activating quantity of a Lewis acid activator. Z is a five-membered heterocyclic group...
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7223824 |
Multinuclear transition metal compound and catalyst system including the same
A multinuclear transition metal compound which has two or more catalytic active sites, and is useful in preparing the olefin polymer and copolymer, is disclosed. The multinuclear transition metal...
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7223822 |
Multiple catalyst and reactor system for olefin polymerization and polymers produced therefrom
Disclosed is a process for producing branched polymers including at least 50 mol % C 3 –C 40 olefins. The process may include: (1) feeding a first catalyst, an activator, and one or more C 2...
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7220805 |
Process for producing contact product; catalyst component for addition polymerization; process for producing catalyst for addition polymerization; and process for producing addition polymer
There are provided (1) a process for producing a contact product, which comprises the step of contacting at least a phthalocyanine complex, a porphyrin complex, or their combination with a...
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7199073 |
Resins that yield low haze films and the process for their production
Catalyst compositions comprising a first metallocene compound, a second metallocene compound, a third metallocene compound, a chemically-treated solid oxide, and an organoaluminum compound are...
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7199072 |
Process of producing a supported mixed catalyst system and polyolefins therefrom
A process for preparing a mixed catalyst compound used in the polymerization of polyolefins to produce bimodal polyethylenes is disclosed. In an embodiment, a process of preparing the mixed...
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7196147 |
Olefin polymerization process with improved operability and polymer properties
Ethylene and optional comonomers are polymerized in the presence of an organozinc compound and a catalyst system to produce an ethylene polymer. The catalyst system comprises a bridged...
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7144964 |
Solution polymerization process utilizing preassembled bimetallic Ziegler-Natta catalyst
A high-temperature solution process for polymerizing ethylene is disclosed. The polymerization is performed in the presence of a preassembled bimetallic Ziegler-Natta catalyst and an aluminum...
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7129302 |
Bimetallic catalyst for producing polyethylene resins with bimodal molecular weight distribution, its preparation and use
Bimetallic catalyst for producing polyethylene resins with a bimodal molecular weight distribution, its preparation and use. The catalyst is obtainable by a process which includes contacting a...
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7087686 |
Chain growth reaction process
A process is disclosed for the preparation of zinc alkyl chain growth products via a catalysed chain growth reaction of an alpha-olefin on a zinc alkyl, wherein the chain growth catalyst system...
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7084216 |
Process for the polymerization of olefins
The present invention relates to a process for homopolymerization of ethylene or copolymerization of ethylene with alpha-olefins by contacting ethylene or ethylene and alpha-olefin with a catalyst...
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7037990 |
Transition metal complexes in the controlled synthesis of polyolefins substituted with functional groups
A method is provided for the polymerization of olefins substituted with a functional group using a transition metal catalyst that, by virtue of one or more stabilizing groups incorporated within...
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7022781 |
Polymerization catalyst systems and processes using alkyl lithium compounds as a cocatalyst
A catalyst system composition comprising a chromium compound supported on a silica-titania support, wherein said catalyst system has been reduced with carbon monoxide, and a cocatalyst selected...
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7001962 |
Olefin polymerization catalyst system
A catalyst system comprises 1) a group 4 organometallic catalyst and 2) an activator comprising a solid zirconium acid component and a metal alkyl. The catalyst system is inexpensive and is highly...
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6995219 |
Olefin polymerization process
The invention relates to a process for the preparation of a multimodal A-olefin polymer comprising polymerizing in a polymerization stage at least one A-olefin in the presence of a multisite...
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6964937 |
Bimetallic catalyst for producing polyethylene resins with bimodal molecular weight distribution, its preparation and use
Bimetallic catalyst for producing polyethylene resins with a bimodal molecular weight distribution, its preparation and use. The catalyst is obtainable by a process which includes contacting a...
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6956089 |
Polymerization process
The invention provides for polymerization catalyst compositions, and for methods for introducing the catalyst compositions into a polymerization reactor. More particularly, the method combines a...
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6943225 |
Multinuclear metallocene catalyst
The present invention relates to a multinuclear metallocene catalyst for olefin polymerization and a process for olefin polymerization using the same, in which the multinuclear metallocene catalyst...
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6936667 |
Polymerization catalyst compositions and processes to produce polymers and bimodal polymers
A process to produce a first catalyst composition is provided. The process comprises contacting at least one first organometal compound and at least one activator to produce the first catalyst...
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6900281 |
Gas phase olefin polymerizations using dual donor catalyst systems
A gas-phase olefin polymerization process in a plug flow reactor uses a catalyst system containing a magnesium halide supported titanium-containing component, an organoaluminum component, and at...
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6897273 |
Catalyst composition, method of polymerization and polymer therefrom
This invention relates to a process to polymerize olefin(s) comprising combining a solution, slurry or solid comprising one or more bulky ligand metallocene catalyst compounds, an optional support,...
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6894128 |
Catalyst composition, method of polymerization, and polymer therefrom
Catalyst compositions and methods useful in polymerization processes utilizing at least two metal compounds are disclosed. At least one of the metal compounds is a Group 15 containing metal...
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6891001 |
Process for the gas phase polymerization of olefins
A process for preparing and controlling the density of high density polyethylene in the gas phase comprising contacting ethylene or a mixture of ethylene and one or more alpha-olefins with a...
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6855655 |
Supported polymerization catalyst
A supported catalyst composition comprising the reaction product of i) a magnesium halide, ii) a solvent, iii) an electron donor compound, iv) and a transition metal compound; an inert support; and...
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6838533 |
Organometal catalyst composition
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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6805955 |
Method for producing fine monofilaments consisting of polypropylene, fine monofilaments consisting of polypropylene and the use thereof
In a process for producing fine monofilaments having improved abrasion resistance from a polypropylene having a melt flow index (MFI) 230° C./2.16 kg of 2-16 g/10 min at a linear density of 5-20...
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6784263 |
Catalyst compositions for polymerizing olefins to multimodal molecular weight distribution polymer, processes for production and use of the catalyst
A solid catalyst component comprises a transition metal-containing metallocene compound, a non-cyclopentadienyl transition metal compound, a magnesium compound and a polymeric material which acts...
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6774078 |
Olefin polymerization catalysts based on annulated cyclopentadienyl 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 annulated...
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6723807 |
Catalyst component and catalyst for addition polymerization, and process for producing addition polymer
A catalyst obtained by contacting a transition metal compound (A) of the general formula [1]: [L p X o Cp j M(N 2 ) n M′X m L l ]X′ k [1], wherein M and M′ independently represent a...
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6677266 |
Process for preparing a vanadium/titanium catalyst and use in olefin polymerization
There are described a process for preparing catalyst components comprising vanadium, titanium, electron donor and magnesium chloride, supported or unsupported; catalyst systems incorporating the...
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6664347 |
Polybutadiene and process for producing the same
Modified polybutadiene having a high-cis and low-trans structure with a moderate 1,2-structure content and exhibiting improved characteristics such as cold flow properties, which is obtained by...
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6653416 |
Polymerization process utilizing organometal catalyst compositions and the polymer produced thereby
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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6653254 |
Ziegler-Natta catalyst with metallocene for olefin polymerization
Provided is a catalyst system for polymerization of monomers having at least one Ziegler-Natta polymerizable bond, comprising: a) a supported Ziegler-Natta transition metal catalyst having a...
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6593442 |
Semicrystalline propylene polymer compositions with good suitability for producing biaxially oriented films
A semicrystalline propylene polymer composition with good suitability for producing biaxially oriented films and prepared by polymerizing propylene, ethylene and/or C 4 -C 18 -1-alkenes, where at...
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6573343 |
Multistep process for preparing polyolefins having high melt strength
Olefin polymers are prepared in a plurality of polymerization stages, optionally in a plurality of polymerization reactors, in the presence of hydrogen and an olefin polymerization multisite...
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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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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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6492473 |
Mixed transition metal catalyst systems for olefin polymerization
The invention encompasses a mixed transition metal olefin polymerization catalyst system suitable for the polymerization of olefin monomers comprising one late transition metal catalyst system and...
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