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7638585 Catalyst flow  
Disclosed are catalyst systems and methods of making the catalyst systems/supports for the polymerization of an olefin containing a solid titanium catalyst component and an antistatic agent. Also...
7399812 Silicon ether compounds and a method for the preparation thereof  
The present invention relates to silicon ether compounds having a general formula (I), a method for the preparation thereof and use thereof as a component of catalysts for polymerization of...
7332455 Catalyst component and catalyst for olefin polymerization as well as use thereof  
The present invention relates to a catalyst component and a catalyst for olefin polymerization. The catalyst component utilizes magnesium halide and silica as composite support, and the particle...
7211535 Enhanced polyolefin catalyst  
The present invention provides a novel process for preparing a catalyst useful in gas phase polymerization of olefins wherein the physical properties of the polymer and the productivity of the...
7169727 Process for forming a ziegler-natta catalyst system having a controlled morphology  
A pre-catalyst is formed by reacting butylethylmagnesium with an alcohol to form a magnesium alkoxide compound, followed by contacting the magnesium alkoxide compound with a phosphorous compound to...
7084217 High activity polyethylene catalysts prepared with borates reagents  
An improved supported Ziegler-Natta catalyst especially useful for olefin polymerisation, the catalyst including a carrier, an organomagnesium compound, a borate compound, and one transition metal...
7022795 Highly crystalline propylene homopolymers  
Propylene homopolymers, wherein, in their separation according to tacticity by first dissolving the polymers in boiling xylene, then cooling the solution to 25° C. at a cooling rate of 10° C./h...
6924343 Olefin polymerization catalyst component, its preparation and use  
A process for polymerizing olefins using a high activity catalyst. The catalyst utilize in the present process has a good balance in activity and can be used to carry out ethylene polymerization at...
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...
6544920 Components and catalysts for the polymerization of olefins  
Solid catalyst component for the polymerization of olefins, includes the product of the direct reaction, with no subsequent reactions with reducing organometallic compounds, between a titanium...
6503993 Propylene polymers and products thereof  
The present invention concerns nucleated propylene polymers having a xylene soluble fraction at 23° C. of less than 2.5%, a crystallization temperature of over 124 ° C. and a tensile modulus of...
6495634 Propylene polymers  
Propylene polymers containing a matrix of a propylene homopolymer and a copolymer of propylene and other alkenes, wherein, during the separation of the propylene polymers according to tacticity and...
6486275 Process for preparing polyolefins  
A process for preparing polyolefins by polymerizing or coploymerizing an olefin or olefins in the presence of a catalyst comprising a solid catalyst component and an organometallic compound is...
6469112 (Cycloalkyl)methyl silanes as external donors for polyolefin catalysts  
One aspect of the present invention relates to a catalyst system for use in olefinic polymerization, containing a solid titanium catalyst component; an organoaluminum compound having at least one...
6437065 Reactive systems from polymerizable monomers which comprise peroxides and stabilized alkylboron compounds  
Reactive systems for polymerizing ethylenically unsaturated compounds comprising a first component, comprised of ethylenically unsaturated compounds capable of polymerization, and a second...
6337377 Process for producing olefin polymers, olefin-polymerizing catalyst and polyproylene for biaxially oriented film produced with said catalyst  
A process for producing an olefin polymer using a catalyst in which (A) is a solid catalyst component which includes magnesium, titanium, halogen and an electron donative compound as essential...
6313225 Catalyst for olefin (co-)polymerization and method for producing the same  
Disclosed is a catalyst for olefin (co-)polymerization comprising a transition metal compound catalytic component which contains at least a titanium compound and an α-olefin (co-)polymer (A)...
6291384 High activity catalyst prepared with alkoxysilanes  
An ethylene-alpha-olefin copolymerization catalyst is prepared by impregnating a silica calcined at elevated temperature sequentially with an organomagnesium compound such as dialkylmagnesium...
6271167 Catalyst for olefin polymerization and method for preparing polyolefins  
Disclosed are a catalyst for polymerizing olefins containing a solid catalyst component containing titanium, magnesium and halogen as essential components (component (A)); an organic aluminum...
6133188 Process for preparing an ethylene polymerization catalyst and ethylene polymerization process  
A preparation process for a catalytic support, based on a special alumina modified with varying quantities of magnesium chloride is described, a higher rate of MgCl 2 leading to a lesser quantity...
6111038 Process for preparing solid titanium catalyst component for olefin polymerization and process for preparing polyolefin  
The present invention intends to provide a process for preparation of a solid titanium catalyst component for an olefin polymerization excellent in polymerization activity per unit catalyst, and a...
6103655 Carrier for olefin polymerization catalysts  
Procedure for the preparation of a solid carrier for olefin polymerization catalysts, comprising the steps: a) impregnating a silica with Mg-chloride solubilized in ethylbenzoate, in the...
6090903 Propylene homopolymer  
A propylene homopolymer having a high stereo-regularity and an excellent processability during sheet or film formation, characterized in that it exhibits a melt flow rate (MFR) of from 0.1 to 20...
6051523 Catalyst systems of the type comprising the Ziegler-Natta catalysts  
Catalyst systems of the type comprising the Ziegler-Natta catalysts contain, as active components, a) a titanium-containing solid component which contains titanium, magnesium, halogen and a...
6043326 Process for copolymerizing ethene and alpha-olefins  
Ethene having a profitable α-olefin distribution and an α-olefin copolymer have been prepared with a process comprising reacting of at least the following components with each other: a) a...
5965478 Solid catalyst component and catalyst for polymerization of olefins  
A solid catalyst component for polymerization of olefins prepared by reacting a titanium halide, a diester of aromatic dicarboxylic acid and a dialkoxymagnesium having a bulk density of at least...
5925587 Supported polymerization catalyst component and system, Polymerization process using same for the production of ultra-fine particle size resins with improved crystallization rates  
A supported polymerization catalyst component and a catalyst system useful in the production of polyolefin resins that have a narrow particle size distribution and enhanced crystallization rates is...
5846895 Supported metallocene complex and process for its preparation  
A supported metallocene complex of a metal M selected from Ti, Zr or Hf, is prepared by a process comprising, in a first step, the reaction of an inorganic carrier containing hydroxyl groups with a...
5773535 Ziegler-natta catalyst systems containing specific organosilicon compounds  
Catalyst systems of the Ziegler-Natta type comprising as active constituents a) a titanium-containing solid component prepared using a titanium compound, a compound of magnesium, a halogenating...
5763349 Solid precursor of a catalytic system for the polymerization of olefins, process for its preparation, catalytic system comprising this solid precursor and process for the polymerization of olefins in the presence of this catalytic system  
Solid precursor of a catalytic system for the polymerization of olefins, containing at least one neutral halogenated metallocene derived from a transition metal, the latter being linked to at least...
5744567 Random propylene copolymers  
Random propylene copolymers containing copolymerized C 2 -C 10 -alk-1-enes are obtainable by polymerization of propylene and C 2 -C 10 -alk-1-enes in the presence of a Ziegler-Natta catalyst...
5710229 Large-pole polyolefin, a method for its production and a procatalyst containing a transesterification product of a lower alcohol and a phthalic acid ester  
The invention relates to a method for preparing polyolefins by polymerizing an olefin with a procatalyst composition prepared by bringing together MgCl 2 , a lower alcohol, a titanium compound and...
5677256 Method of preparing catalyst composition for polymerizing olefins  
An olefin polymerization catalyst composition is prepared by adding an organometallic compound of a group IA to IIIA metal to a procatalyst containing a support impregnated with TiCl 4 but without...
5652314 Shape-shifted magnesium alkoxide component for polymerizing olefins  
A process is provided for preparing a shape-shifted catalyst component comprising (1) contacting a dihydrocarbyloxide magnesium compound with carbon dioxide in the presence of a slurrying agent to...
5623033 Titanium catalyst component for ethylene polymerization, ethylene polymerization catalyst, and process for ethylene polymerization using the same  
Disclosed is a titanium catalyst component for ethylene polymerization obtained by contacting [A] a solid magnesium aluminum complex containing magnesium, halogen, aluminum and an alkoxy group...
5618895 Process for preparing copolymers of propylene with other 1-alkenes  
Copolymers of propylene with other 1-alkenes, obtainable by gas-phase polymerization of a mixture of propylene and another 1-alkene in the absence of a liquid reaction medium under a pressure of...
5612427 Catalyst for the polymerization of diolefins, method for its preparation, and its use for the preparation of polymers  
A supported solid catalyst which can be used for the polymerization and clymerization of conjugated dienes having as its basis the reaction product of: A) a solid MgCl 2 support, B) an...
5610246 Process for polymerizing propylene using a silica-supported catalyst  
A new catalyst useful in the polymerization of at least one olefin is disclosed. The catalyst comprises the product obtained by contacting silica, in random order, with (1) at least one hydrocarbon...
5597770 Titanium-based catalyst composition for polymerizing ethylene  
A catalyst compound of the formula (I) is useful in the polymerization of ethylene into homopolymers or copolymers of high density and high melt flow ratio. The catalyst is prepared with a partial...
5561091 High activity polyethylene catalyst prepared from an alcohol and silicon tetrachloride  
A catalyst composition for producing linear low density polyethylene with relatively narrower molecular weight distributions is described. The catalyst is formed by treating silica having reactive...
5529850 Fibers produced from crystalline propylene polymers having high melt flow rate values and a narrow molecular weight distribution  
Crystalline propylene polymers having P.I. values lower than or equal to 3.7, and having, at an MFR (Melt Flow Rate) ranging from 600 to 1000 g/10 min., an Mw value from 100,000 to 60,000, and at a...
5521135 Solid component of catalyst for the (CO)polymerization of ethylene  
A solid component of catalyst for the (co)polymerization of ethylene is composed of a silica carrier and a catalytically active part including titanium, magnesium, chlorine and alkoxylic groups and...
5506183 Catalyst for preparing polyolefins  
Polyolefins having better particle properties are obtained by polymerizing olefins in the presence of a catalyst comprising a solid catalyst component and an organometallic compound, the said solid...
5476911 Crystalline propylene polymers having high melt flow rate values and a narrow molecular weight distribution  
Crystalline propylene polymers having P.I. values lower than or equal to 3.7, and having, at an MFR (Melt Flow Rate) ranging from 600 to 1000 g/10 min., an Mw value from 100,000 to 60,000, and at a...
5413979 Method for the preparation of a catalyst component for the polymerization of olefins, a polymerization catalyst component produced by the method and use of the same  
The invention relates to a method for the preparation of a solid procatalyst composition for a catalyst system intended for the polymerization of olefins, wherein a magnesium halide, such as...
5407882 Olefin polymerization catalyst and olefin polymerization process  
A catalyst for polymerization of olefin is provided which comprises (A) a metallocene compound, (B) an organoaluminum compound, and (C) a metal borate or a metal aluminate. The metallocene compound...
5344885 Preparation of propylene-ethylene copolymers  
Propylene-ethylene copolymers are obtained by two-stage polymerization from the gaseous phase in an agitated fixed bed by means of a Ziegler-Natta catalyst system that contains in addition to a...
5344803 Cocatalyst for transition metal-containing α-olefin polymerization catalyst  
The present invention is directed to a novel halosilane cocatalyst component which, when used in conjunction with an aluminum containing cocatalyst, is effective in increasing the activity of a...
5330949 Method for producing polyolefin  
A method for producing a polyolefin is disclosed which comprises polymerizing an α-olefin in the presence of a catalyst composition comprising (A) a solid catalyst component prepared by contacting...
5324698 New carrier catalyst for the polymerization of ethylene  
A problem in the conventional olefin polymerization catalyst systems, the procatalysts of which are based on a solid carrier and a titanium compound and an electron donor on its surface, is that...
Matches 1 - 50 out of 159 1 2 3 4 >