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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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7598201 |
Process for preparing a support for olefin polymerization catalysts
The invention relates to a process for preparing an essentially spherical support for olefin polymerization catalysts, which comprises the steps: preparation of a hydrogel comprising a cogel 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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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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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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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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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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7485687 |
Ethylene-α-olefin copolymer, molding thereof and process for producing the copolymer
An ethylene-α-olefin copolymer containing monomer units derived from ethylene and monomer units of an α-olefin having 3 to 20 carbon atoms and having a melt flow rate of from 0.01 to 100 g/10...
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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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7468416 |
Catalyst composition for olefin polymerization
A process for the preparation of a catalyst system includes the steps of combining a Lewis base, an organic compound having at least one functional group containing active hydrogen, and an...
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7465773 |
Polymerizable composition and formed article using the same
A polymerizable composition which comprises a cycloolefin monomer (A), a filler (B), a polymer (C) having a carboxyl group or a carboxylic acid anhydride group and having an acid value of 0.1 to...
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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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7442667 |
Preparation of supported cocatalysts
The present invention relates to a process for preparing a supported cocatalyst for olefin polymerization, which comprises reacting A) a support bearing functional groups, B) triethylaluminum and...
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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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7414099 |
Hindered polyalicyclic alkyl catalysts and their use in a gas-phase polymerization reactor
Embodiments of the present invention include a method of polymerizing olefins comprising contacting olefins with a catalyst composition made by the process of combining a hindered polyalicyclic...
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7414005 |
Preparation of catalyst compositions having improved activity
The present invention relates to a process for preparing a catalyst composition for olefin polymerization, which comprises preparing a catalyst solid in a first step by bringing A) at least one...
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7410927 |
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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7402638 |
Propylene polymer particle method of producing the same and use thereof
The present invention relates to a propylene random copolymer which satisfies the following requirements [1] to [4], and to various useful molded products obtained by molding the propylene random...
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7385015 |
Trialkylaluminum treated supports
This invention relates to a process to prepare a trialkylaluminum treated support comprising: 1) combining a support with first trialkylaluminum compound(s), where the alkyl groups have at least 2...
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7381780 |
Catalyst compositions comprising small silica support materials and methods of use in polymerization reactions
Improved catalyst compositions, and polymerization processes using such improved catalyst compositions, are provided. An example of an improved catalyst composition is a supported catalyst system...
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7368411 |
Supported metallocene catalysts and their use in producing stereospecific polymers
Supported stereospecific catalysts and processes for the stereotactic propagation of a polymer chain derived from ethylenically unsaturated monomers which contain three or more carbon atoms or...
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7354981 |
Polyethylene catalyst and a process for preparing the same
The present invention discloses a polyethylene catalyst and a process for preparing the same, said catalyst being composed of a main component of catalyst and a cocatalyst, wherein the main...
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7345119 |
Olefin polymerization catalyst and olefin polymerization method using the same
An olefin polymerization solid catalyst including a reaction product of a transition metal compound and an organoaluminum compound carried on a support having silica treated with an...
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7326759 |
Compositions for solid freeform fabrication
Chemical compositions are disclosed. One exemplary composition, among others, includes: a basic component, an acidic component, at least one acrylate component, oxidizing agent, reducing agent, and...
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7326757 |
Supported catalyst for olefin polymerization
Disclosed are catalyst systems and methods of making the catalyst systems for the polymerization of an olefin containing a solid titanium catalyst component containing an inorganic titanium...
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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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7300988 |
Single catalyst low, medium and high density polyethylenes
A method of polymerizing olefins comprising combining in one embodiment ethylene and optionally one or more α-olefins with a catalyst composition in a continuous polymerization reactor at a...
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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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7294679 |
Catalyst support method and polymerization with supported catalysts
This invention relates to a method to support one or more catalyst compounds comprising contacting the catalyst compounds with a pretreatment agent comprising an aluminum alkyl and or an alumoxane...
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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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7294599 |
Acidic activator-supports and catalysts for olefin polymerization
This invention relates to the field of olefin polymerization catalyst compositions, and methods for the polymerization and copolymerization of olefins, typically using a supported catalyst...
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7268195 |
Mesoporous catalyst support, a catalyst system, and method of making and using same for olefin polymerization
This invention relates to a catalyst system comprising a catalyst and a support comprising a non-layered inorganic porous crystalline phase material, wherein the support comprises a hexagonal...
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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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7256243 |
Silicon compound
The present invention provides a novel silicon compound represented by Formula (1) having a living radical polymerization initiating ability for addition-polymerizable monomers and a polymer...
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7256150 |
Preparation of olefin polymerization catalyst component
A process for producing a Gp 2/transition metal olefin polymerisation catalyst component, in which a Gp 2 complex is reacted with a transition metal compound so as to produce an oil-in-oil...
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7247686 |
Solid cocatalyst component for olefin polymerization and catalyst system thereof
A solid cocatalyst for olefin polymerization in which an ion-containing compound comprising a cation expressed by [R 4 M]+, wherein the group R are each individually selected from the group...
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7238756 |
Polymerization process and control of polymer composition properties
Methods of controlling the flow index and/or molecular weight split of a polymer composition are disclosed. The method of producing a polymer composition in one embodiment comprises incorporating a...
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7232785 |
Solid catalytic component and catalytic system of the ziegler-natta type, process for their preparation and their use in the polymerization of alk-1-enes
The present invention relates to a new solid catalytic component, which can be used in combination with an aluminum compound as co-catalyst and optionally an external electron donor as additional...
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7223823 |
Catalyst system and process
This invention relates to a process of polymerizing ethylene in a reactor comprising contacting a catalyst system comprising a supported chromium catalyst and an aluminum alkyl cocatalyst, where...
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7220804 |
Method for preparing a catalyst system and its use in a polymerization process
The present invention relates to a supported catalyst composition and a method for making the supported catalyst composition and its use in a process for polymerizing olefin(s). In particular, the...
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7220695 |
Supported activator
This invention relates to supported activators comprising the product of the combination of an ion-exchange layered silicate, an organoaluminum compound, and a heterocyclic compound, which may be...
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7205363 |
Polymerization processes using antistatic agents
The invention relates to a process for the polymerization of olefins using an antistatic agent. In particular, the invention relates to a polymerization process to produce propylene polymers using...
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7202190 |
Supported catalyst system for the polymerization of olefins
A supported catalyst system for polymerizing olefins comprising a) a support, b) a Lewis base of the formula
M 3 R 6 R 7 R 8 ...
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RE39561 |
Metallocenes containing ligands of 2-substituted indenyl derivatives, process for their preparation, and their use as catalysts
The novel metallocenes of the formula I
in which, preferably, M 1 is Zr or Hf, R 1 and R 2 are alkyl or halogen, R 3 and R 4 are hydrogen, R 5 and R 6 are alkyl or haloalkyl, —(CR 8 R...
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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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7172988 |
Catalyst component for ethylene polymerization, a process for preparing thereof and catalyst comprising the same
A catalyst component for ethylene polymerization, including an inorganic oxide support, and at least one alkyl metal compound, at least one halide, at least one dihydrocarbyl magnesium compound, at...
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7169864 |
Metallocene catalysts, their synthesis and their use for the polymerization of olefins
A process for the preparation of a catalyst system includes the steps of combining a support material with a first composition which includes at least one aluminoxane in a first solvent to provide...
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7163993 |
Electrical devices from polymer resins prepared with ionic catalysts
This invention relates to olefin polymers particularly suited to satisfying the dielectric properties required in electrical device use. The olefin polymers can be prepared by contacting...
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