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8178633 |
Gas-phase polymerization process having multiple flow regimes
The present invention relates to an improvement for gas phase olefin polymerization process under two or more different flow regimes. The process involves adding a mixed electron donor system to a...
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8088872 |
Procatalyst composition including silyl ester internal donor and method
The present disclosure provides silyl esters and silyl diol esters suitable as internal electron donors in procatalysts for polymer production. Disclosed are procatalyst compositions formed from a...
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7989383 |
Self limiting catalyst composition and propylene polymerization process
A catalyst composition for the polymerization of propylene comprising one or more Ziegler-Natta procatalyst compositions comprising one or more transition metal compounds and one or more esters of...
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7985815 |
Polymer, its preparation and uses
A polymer comprising a first repeat unit comprising ArhX2 wherein ArhX2 comprises a substituted or unsubstituted heteroaryl group and each X is the same or different and independently comprises a...
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7977435 |
Propylene polymer compositions and processes for making the same
Provided are a propylene polymer compositions comprising a propylene copolymer and a propylene homopolymer polymerized in the presence of the propylene copolymer. The propylene polymer compositions...
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7951883 |
Preparation of multimodal, high density, ethylene homopolymer barrier resins and films
Disclosed is a multimodal, high density, homopolyethylene barrier resin. The resin is preferably made by a multistage process. The process comprises a first stage in which ethylene is...
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7939460 |
Process for producing solid catalyst component precursor for olefin polymerization
A production process is provided for an olefin polymerization catalyst component precursor, including the steps of (I) adding an organomagnesium compound to a solution containing a solvent, a...
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7893003 |
Catalyst composition with mixed selectivity control agent and method
The present disclosure provides a Ziegler-Natta catalyst composition comprising a procatalyst, a cocatalyst and a mixed external electron donor comprising a first selectivity control agent, a...
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7884164 |
Catalyst system for olefin polymerization comprising trioxasilocane and method for olefin polymerization using the same
The present invention relates to a catalyst system for olefin polymerization and a method for olefin polymerization using the same. More particularly, the present invention relates to a...
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7858716 |
Propylene-based polymer and production method therefor, propylene-based polymer composition and molded body made thereof
Disclosed is a production method of polypropylene having high MFR value and excellent product qualities with high productivity. The method enables to produce a propylene polymer by a gas phase...
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7851578 |
Succinate-containing polymerization catalyst system using n-butylmethyldimethoxysilane for preparation of polypropylene film grade resins
It has been discovered that using n-butylmethyldimethoxysilane (BMDS) as an external electron donor for succinate-containing Ziegler-Natta catalysts can provide a catalyst system that may prepare...
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7781363 |
Self limiting catalyst composition and propylene polymerization process
A catalyst composition for the polymerization of propylene comprising one or more Ziegler-Natta procatalyst compositions comprising one or more transition metal compounds and one or more esters of...
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7718565 |
Method for preparing solid catalysts for ethylene polymerization and copolymerization
The present invention relates to a method for preparing a solid catalyst for ethylene polymerization and/or copolymerization. More specifically, the present invention relates to a solid titanium...
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7704910 |
Catalyst for polymerization of olefins and method for polymerization of olefins
A catalyst for olefin polymerization comprising (A) a solid catalyst component prepared by causing (a) a magnesium compound, (b) a tetravalent titanium halide compound, and (c) an electron donor...
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7687426 |
Catalyst composition with monocarboxylic acid ester internal donor and propylene polymerization process
A catalyst composition for the polymerization of propylene comprising one or more Ziegler-Natta procatalyst compositions comprising one or more transition metal compounds and one or more monoesters...
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7678867 |
Process for the (co)polymerization of ethylene
A process for preparing a broad molecular weight polyethylene carried out in the presence of a catalyst system comprising (i) a solid catalyst component comprising Mg, Ti, halogen, and optionally...
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7678868 |
Self limiting catalyst composition and propylene polymerization process
A catalyst composition for the polymerization of propylene comprising one or more Ziegler-Natta procatalyst compositions comprising one or more transition metal compounds and one or more esters of...
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7619048 |
Method for producing propylene polymer using alkoxysilane compound containing trialkysilyl group in molecular structure
Disclosed is a method for producing a propylene polymer using an alkoxysilane compound comprising a trialkylsilyl group in its molecular structure, specifically a method for easily producing an...
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7619049 |
Cyclic organosilicon compounds as electron donors for polyolefin catalysts
Cyclic organosilicon compounds that may be employed as an electron donor for polymerization catalyst systems, polymerization catalyst systems employing the cyclic organosilicon compounds as an...
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7618913 |
Highly active alpha-olefin copolymerization catalyst system
A high activity magnesium-based supported catalyst component useful in a catalyst system for the compolymerization of ethylene and alpha-olefin and a process for preparing the catalyst component is...
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7605215 |
Process for producing olefin copolymerization catalyst and process for producing olefin copolymer
A process for producing an olefin copolymerization catalyst, comprising the step of contacting, with one another, (A) a solid catalyst component containing a titanium atom, a magnesium atom and a...
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7531607 |
Process for producing olefin polymers
A process for producing at least two different propylene polymer grades, in which process the isotacticity of the polymer is changed while keeping the melt flow rate of the polymer at a...
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7465776 |
High crystallinity, high melt flow rate polypropylene
High melt flow rate high crystallinity polypropylene homopolymer are produced in a bulk polymerization process using a Ziegler-Natta catalyst containing a combination of two internal electron...
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7452947 |
Silica-supported polymerization catalyst
A process for the preparation of a silicon containing transition metal compound that includes the steps of (a) non-hydrolytic sol-gel condensation of a silane of formula LxSiQn wherein L is a...
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7381779 |
Self limiting catalyst composition with dicarboxylic acid ester internal donor and propylene polymerization process
A catalyst composition for the polymerization of propylene comprising one or more Ziegler-Natta procatalyst compositions comprising one or more transition metal compounds and one or more esters of...
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7365136 |
High melt strength polypropylene
The present invention concerns a high melt strength propylene polymer or copolymer suitable for manufacturing foams and thermoformed product exhibiting a melt strength of at least 3 g and...
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7351678 |
Catalyst systems for Ziegler-Natta propene polymerisation
The invention relates to the use of nitrogenous aluminium organyl complexes of general formula (I) as co-catalysts in heterogeneous polymerisation reactions of propene. In said formula: R, R′, R1 a...
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7348381 |
High modulus, high ductility polyolefins
Provided herein are propylene polymers which are capable of being used as thermoplastic polyolefins just as they emerge from the reactor system described, without further compounding of components...
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7345122 |
High stereospecific polybutylene polymer and highly active process for preparation thereof
Disclosed is a process for the preparation of a high stereospecific (isotactic) polybutylene polymer comprising the step of polymerizing a reactive monomer, 1-butene, which is used or is not used...
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7329714 |
Method of polymerizing propylene comprising olefin pre-polymerization step
The present invention relates to a method of polymerizing olefin containing the step of pre-polymerization. More precisely, according to the method of the present invention, the reaction speed and...
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7276463 |
Polymerization catalyst for α-olefins and process for production of α-olefin polymers therewith
A catalyst having a high catalyst activity, which enables the production of an α-olefin polymer improved in stereoregularity by decreasing an amorphous component, and a production method for the ...
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7244794 |
Method for producing propylene polymer having a very high melt-flowability
The present invention relates to a method for producing a propylene polymer having a very high melt flowability, specifically to a method for producing an isotactic propylene polymer having a...
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7238758 |
Catalysts for polymerization or copolymerization of α-olefins, catalyst components thereof, and processes for polymerization of α-olefins with the catalysts
The invention has an object to provide a catalyst for polymerizing or copolymerizing an α-olefin, catalyst constituent thereof, and method of polymerizing α-olefins with the catalyst, for p...
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7202191 |
Polymerization catalyst system using n-butylmethyldimethoxysilane for preparation of polypropylene film grade resins
It has been discovered that using n-butylmethyldimethoxysilane (BMDS) as an external electron donor for Ziegler-Natta catalysts can provide a catalyst system that may prepare polypropylene films...
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7193022 |
Method of polymerization and copolymerization of ethylene
Disclosed is a method of polymerization and copolymerization of ethylene, which is carried out in the presence of (a) a solid titanium complex catalyst prepared by the steps of (i) preparing a...
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7153803 |
High activity and good hydrogen response Ziegler-Natta polyethylene catalyst
Disclosed are catalyst systems and methods of making the catalyst systems/supports for the polymerization of polyethylene containing a solid titanium catalyst component containing a titanium...
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7135532 |
Process for producing solid catalyst component and catalyst for α-olefin polymerization, and process for producing α-olefin polymer
There are disclosed a process for producing a solid catalyst component and a catalyst for α-olefin polymerization, and a process for producing an α-olefin polymer, wherein the process for p...
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7109143 |
Polymerization catalyst system using n-butymethyldimethoxysilane for preparation of polypropylene film grade resins
It has been discovered that using n-butylmethyldimethoxysilane (BMDS) as an external electron donor for Ziegler-Natta catalysts can provide a catalyst system that may prepare polypropylene films...
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7071138 |
Solid catalyst component for olefin polymerization, catalyst for olefin polymerization and process for producing olefin polymer
A solid catalyst component for olefin polymerization in which the molar ratio of residual alkoxy groups to supported titanium is 0.60 or less is obtained by reacting the following compound (a1)...
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7026421 |
Random propylene copolymers
Random copolymers of propylene with other 1-alkenes having up to carbon atoms, whose content of comonomers is in the range from 0.7 to 1.4% by weight if the only comonomer present in the propylene...
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6825146 |
Olefin polymerization catalyst compositions and method of preparation
A method of making a solid procatalyst composition for use in a Ziegler-Natta olefin polymerization catalyst composition, said method comprising: contacting a solid precursor composition comprising...
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6800703 |
Method for preparing propylene polymers having broad molecular weight distribution
A method for producing propylene polymers having a broad molecular weight distribution (MWD) is disclosed. The method uses a Ziegler catalyst and one silane donor. The silane donor is selected from...
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6799568 |
Process for the preparation of a catalyst component for the polymerization of an olefin
The invention is directed to a process for the preparation of a catalyst component for the polymerization of an olefin by: a) contacting metallic magnesium with an organic halide RX, where R is an...
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6750306 |
Hyperbranched polymers by coordination polymerization
Hyperbranched copolymers comprising at least one C2-C20 α-monoolefin monomers and 0.2 to 20 mole % of at least one α, ω-non-conjugated diene monomers having 5 to 18 carbon atoms are prepared by co...
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6747103 |
High-stiffness propylene polymers and a process for the preparation thereof
The present invention concerns high-stiffness polymer composition and a process for producing a polymer composition by nucleated with a polymeric nucleating agent containing vinyl compound units....
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6730753 |
Catalyst systems of the ziegler-natta type and a process for preparing them
Catalyst systems of the Ziegler-Natta type, which are suitable for the polymerization of olefins are prepared by: A) bringing an inorganic metal oxide on which a magnesium compound has been...
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6699814 |
Catalysts for the polymerization of olefins
The present invention relates to catalysts particularly suitable for the sterospecific polymermerization of olefins, comprising Ti, Mg, halogen and an electron donor compound selected from...
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6689849 |
Catalyst for bulk polymerization, catalyst for vapor phase polymerization, method of polymerization using these, and olefin polymer obtained with these
The present invention provides a catalyst for bulk or vapor-phase polymerization having high polymerization activity during bulk or vapor-phase polymerization and providing an olefin polymer having...
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6686433 |
Dual donor catalyst system for the polymerization of olefins
The present invention provides a catalyst system that exhibits unexpected control of desired properties in polyolefin products. The catalyst system includes a titanium-supported catalyst in...
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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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