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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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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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7601665 |
Compositions that can produce polymers
This invention provides a compositions that are useful for polymerizing at least one monomer into at least one polymer.
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7601409 |
Stretch film
Stretch films are disclosed, the films having at least one layer formed of or including a polyethylene copolymer and having a natural draw ratio of at least 250%, a tensile stress at the natural...
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7598328 |
Supported catalysts for manufacture of polymers
A supported catalyst composition and process for preparing high molecular weight polymers of one or more addition polymerizable monomers, especially propylene, said composition comprising:
...
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7598200 |
Ionic liquids for heterogenising metallocene catalysts
The present invention discloses a method for preparing an heterogeniseded catalyst component comprising the steps of: a) providing a halogenated precursor component of formula (I) —X—[—CH 2...
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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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7592403 |
Ethylene polymer, preparation process thereof and molded articles of the same
The present invention provides ethylene polymers capable of preparing various molded articles such as films, sheets or the like, and having excellent moldability, particularly excellent high-speed...
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7592402 |
Process for producing modified particle; carrier; catalyst component for addition polymerization; process for producing catalyst for addition polymerization; and process for producing addition polymer
A process for producing a modified particle, which comprises the step of contacting a compound (a) defined by the formula, M 1 L 1 3 , a compound (b) defined by the formula, R 1 t-1 TH, a compound...
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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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7592285 |
Method for preparing an olefin polymerization catalyst composition
The present invention provides for a method for preparing a storable fluidic olefin polymerisation catalyst composition, said catalyst comprising an organometallic compound of a transition metal of...
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7589160 |
Process for preparing 1-butene polymers
A process for obtaining 1-butene polymers comprising the step of contacting under polymerization conditions 1-butene and optionally ethylene, propylene or said alpha-olefin, in the presence of a...
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7589042 |
Arylphenoxy catalyst system for producing ethylene homopolymer or copolymers of ethylene and α-olefins
Disclosed is an arylphenoxy catalyst system for producing an ethylene homopolymer or copolymers of ethylene and α-olefins, and a method of producing an ethylene homopolymer or copolymers of...
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7582711 |
Ziegler-type catalysts having increased productivity
The present invention relates to catalyst systems for polyolefin production, and more particularly, to catalyst systems for polyolefins used in producing films.
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7579415 |
Polymerization process using metallocene catalyst systems
The present invention relates to a polymerization process using improved metallocene catalyst systems. Specifically, the catalyst systems of the present invention relate to a metallocene compound...
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7576163 |
Polymerization catalysts for producing polymers with low levels of long chain branching
This invention relates to catalyst compositions, methods, and polymers encompassing at least one Group 4 metallocene compound comprising bridging η 5 -cyclopentadienyl-type ligands, typically in...
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7569713 |
Hydrogenated catalyst
The invention discloses a method for making a hydrogenated metallocene catalyst component comprising the steps of: 1. Providing a compound comprising at least one aromatic group; 2. Hydrogenating...
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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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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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7557171 |
Halogen substituted metallocene compounds for olefin polymerization
A metallocene compound comprising a transition metal, a first substituted or unsubstituted indenyl or fluorenyl ligand pi—bonded to the transition metal, a second monoanionic ligand bonded to the...
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7556911 |
Titanocene based compound, photosensitive composition, photosensitive transfer sheet and pattern forming method
A titanocene compound having a carbonyl group, and a photosensitive composition whose sensitivity has been enhanced by containing this as a photopolymerization initiator, a photosensitive transfer...
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7553917 |
Technique for selecting polymerization modifiers cross reference statement
A combinatorial method for identifying a catalyst composition for use in the homogeneous addition polymerization of an olefin monomers, said catalyst composition comprising a transition metal...
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7550543 |
Polymer-based composites comprising carbon nanotubes as a filler, method for producing said composites, and associated uses
The invention relates to a method for producing carbon nanotubes in a dispersed state. The method comprises a stage whereby polymerization is carried out from at least one so-called monomer of...
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7547751 |
Process for the preparation of a polyolefin
The invention related to a process for the polymerization of at least one aliphatic C 2-20 or aromatic C 4-20 hydrocarbyl mono- or multiolefin in the presence of a catalyst and an aluminum...
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7547654 |
Catalytic system for obtaining conjugated diene/monoolefin copolymers and these copolymers
A catalytic system usable for the copolymerization of at least one conjugated diene and at least one monoolefin, a process for preparing this catalytic system, a process for preparing a copolymer...
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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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7541481 |
Monocyclopentadienyl complex
Monocyclopentadienyl complexes in which the cyclopentadienyl system bears at least one unsubstituted, substituted or fused, heteroaromatic ring system bound via a specific bridge, a catalyst...
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7538174 |
Isotactic 1-butene copolymers
An isotactic 1-butene copolymer having a content up to 30% by mol of at least one alpha-olefin of formula CH 2 ═CHZ derived units, wherein Z is a C 3 -C 20 hydrocarbon group, having the...
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7538173 |
Polyolefin compositions
Ethylene copolymers valuable for films, coatings, sheets, and molded articles are disclosed. Some of the copolymers have a long-chain-branching index from 0.25 to 0.60 and a gpcBR index from 0.1 to...
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7538167 |
Syndiotactic polypropylene and methods of preparing same
A syndiotactic polypropylene comprising a melting temperature of greater than 160° C., a percentage of syndiotactic pentads greater than 95%, a toluene soluble fraction of equal to or less than...
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7534848 |
1-butene copolymers and process for preparing them
A process comprising contacting 1-butene and one or more alpha-olefins under polymerization conditions in the presence of a catalyst system obtainable by contacting: (A) a metallocene compound of...
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7534842 |
Catalysts for olefin polymerization
This invention relates to the field of olefin polymerization catalyst compositions, and methods for the polymerization and copolymerization of olefins, including polymerization methods using a...
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7534841 |
1-butene polymer and process for the preparation thereof
A 1-butene polymer optionally containing from 0 to 30% by mol of derived units of ethylene, propylene or alpha-olefin of formula CH2═CHZ, wherein Z is a C 3 -C 20 linear or branched alkyl...
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7531609 |
Process for the preparation of 1-butene/propylene copolymers
A solution polymerization process for obtaining isotactic, crystalline or crystallizable 1-butene/propylene polymers comprising contacting under polymerization conditions at a temperature ranging...
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7531608 |
Transition metal complexes, catalyst compositions containing the same, and olefin polymerization using the catalyst compositions
Provided are a novel transition metal complex where a monocyclopentadienyl ligand to which an amine-based group is introduced is coordinated, a method of synthesizing the same, and olefin...
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7531605 |
Process for producing polyolefin resin composition and polypropylene composition
A process for producing a polyolefin-based resin composition comprises, in the first polymerization stage, polymerizing an α-olefin having 4 to 20 carbon atoms, a styrene or a cyclic olefin in the...
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7528090 |
Supported polymerisation catalysts
A supported polymerisation catalyst system comprises a porous support, a polymerisation catalyst and a cocatalyst wherein the support has been treated with an inert material such as polyisobutene....
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7524906 |
Process for the preparation of a metal-organic compound comprising at least one imine ligand
The invention relates to a process for the preparation of a metal-organic compound, comprising at least one imine ligand, characterized in that an imine ligand according to formula 1, or the HA...
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7524905 |
Substantially linear copolymers and methods of making the same
Substantially linear copolymers derived from at least one acyclic aliphatic olefin monomer and at least one nitrogen containing vinyl monomer, wherein the at least one nitrogen containing vinyl...
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7524789 |
Process for producing modified particle, carrier or catalyst component for addition polymerization, pre-polymerized catalyst component therefor, catalyst therefor, and addition polymer
A process for producing a modified particle, a carrier or a catalyst component for addition polymerization, which comprises the steps of (1) contacting a compound (a) represented by the defined...
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7521572 |
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. An improved method for preparing...
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7521518 |
Ethylene copolymer compositions
Disclosed is a novel ethylene copolymer by copolymerizing an ethylene and at least one comonomer selected from a compound represented by the formula H 2 C═CHR wherein R is an alkyl group or an...
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7521507 |
Polypropylene-based adhesive compositions
An adhesive blend is described that can include a semi-crystalline copolymer of propylene and at least one comonomer selected from the group consisting of ethylene and at least one C 4 to C 20 ...
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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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7517939 |
Polymerization catalysts for producing high molecular weight polymers with low levels of long chain branching
This invention relates to catalyst compositions, methods, and polymers encompassing at least one Group 4 metallocene compound comprising bridging η 5 -cyclopentadienyl-type ligands, typically in...
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7514510 |
Fluorenyl catalyst compositions and olefin polymerization process
An olefin polymerization process comprising contacting one or more olefins and a catalyst component in a reaction zone under suitable reaction conditions to form a polyolefin, wherein the catalyst...
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7514509 |
Catalyst compositions and methods of forming isotactic polyproyplene
Olefin polymerization processes are described herein. In one embodiment, the process generally includes introducing propylene monomer to a reaction zone, disposing an isospecific metallocene...
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7511108 |
Pneumatic tire
The invention relates to a pneumatic tire having excellent mechanical properties by using a rubber composition containing a polybutadiene rubber having a high cis-1,4 bond content, a low vinyl bond...
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