Matches 1 - 50 out of 233 1 2 3 4 5 >
Match Document Document Title
7504464 Process for control of polymer fines in a gas-phase polymerization  
A gas phase polymerization process comprising: (1) preparing a solution of a catalyst precursor comprising a mixture of magnesium and titanium compounds, an electron donor and a solvent; (2) adding...
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...
7183234 Multi-donor catalyst system for the polymerization of olefins  
The present invention provides catalyst systems including a Ziegler-Natta or Ziegler-Natta-type catalyst in combination with a mixture of certain electron donors.
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...
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...
7060764 Method for polymerization and copolymerization of ethylene  
A method for polymerization and copolymerization of ethylene is disclosed. The polymerization is carried out in the presence of a preactivated titanium solid complex catalyst supported on a carrier...
6992034 Catalyst component for olefin polymerization  
A solid catalyst component useful for the (co)-polymerization of olefins is disclosed. The catalyst component is prepared by reacting an activated magnesium halide composite support with a...
6956002 Process for polymerization of olefins  
A catalyst for olefin polymerization, comprising: a solid catalyst component comprising [A] a solid component having substantially no hydroxyl group, [B] a compound of a transition metal...
6784133 Method for preparing catalyst for olefin polymerization  
Disclosed is a preparation method of titanium catalyst for olefin polymerization, the method comprising (1) preparing magnesium compound solution by resolving non-deoxidative magnesium halide and...
6770586 Solid catalyst component and catalyst for olefins polymerization  
Solid catalyst components and catalysts which contain (a) magnesium compound, (b) titanium tetrachloride, and (c) a phthalic acid diester or its derivative are useful in the synthesis of olefin...
6610802 Process for synthesis of polymer compositions, polymer compositionS obtainable by the process, and use of the same  
The present invention relates to a process for synthesis of polymer compositions with reduced catalyst content, wherein ethylenically unsaturated monomers containing less than 0.5 wt % of...
6545106 Process for the polymerization of olefines  
Process for the polymerization of olefins, according to which at least one olefin is placed in contact with a catalytic system comprising: a) a solid catalytic complex based on magnesium,...
6537942 Olefin polymerization catalyst and process for preparing polypropylene and propylene block copolymer  
Olefin polymerization catalyests are formed from: (I-2) a contact product obtained by contacting (A) a solid titanium catalyst component, (B) an organometallic compound catalyst component, and (D)...
6531553 Process for increasing molecular weight in polyolefins using Ziegler-Natta catalysts and lithium compounds  
This invention relates to a conventional supported heterogeneous Ziegler-Natta catalyst for the polymerization of olefins. It has been found that adding a lithium compound to a transition metal...
6348554 Method for preparation of a liquid polymer composition and use of this composition  
The invention concerns a method for preparation of a liquid polymer composition, where ethylenically unsaturated monomers are polymerized by means of initiators that have a transferable atomic...
6294624 Modified diene elastomer and its preparation  
A modified diene elastomer prepared by a process comprising the steps of polymerizing a diolefin compound containing a conjugated double bond in a liquid phase in the presence of a cobalt compound,...
6201079 Propylene polymer resin made from a high activity catalyst having a broad thermal processing window and articles made therefrom  
A propylene polymer made using a magnesium halide-supported, titanium-containing solid catalyst component having a broad processing window is produced by incorporating into the polymerization...
6084042 Mixed titanium-vanadium catalysts for solution ethylene polymerization  
The present invention provides a Ziegler-Natta catalyst based on titanium and vanadium useful in solution processes for the polymerization of olefins having a low amount of aluminum and magnesium....
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...
6001939 Process for the polymerization of olefins  
Process for the polymerization of olefins, in which at least one olef in is placed in contact with a catalytic system comprising: (a) a solid catalytic complex based on magnesium, on transition...
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...
5922632 Vanadium based components and catalysts for the polymerization of olefins and polymerization processes using the same  
Catalysts component of the (co)polymerization of alpha-olefins CH 2 CHR, wherein R is hydrogen or an alkyl radical having from 1 to 8 carbon atoms, comprising a product of the composition: ...
5777050 Process for polymerizing ethylene in the presence of a catalyst composition  
A process is disclosed for the homopolymerization of ethylene or copolymerization of ethylene with one or more α-olefins with 3-12 carbon atoms and optionally one or more non-conjugated dienes in...
5747595 Catalyst for the polymerization of olefines and processes for the polymerization of olefines using the same  
A catalyst for the polymerization of olefines comprises a solid catalytic component obtained by pre-polymerizing propylene in the presence of (A) a solid component containing magnesium, titanium,...
5731393 Ethylene polymer, process for preparing the same, solid titanium catalyst component for ethylene polymerization and ethylene polymerization catalyst  
An ethylene polymer having small values of Mw/Mn and Mz/Mw, a small proportion of long-chain branches and a high swell ratio and a process for preparing the polymer are disclosed. A solid titanium...
5631334 Process for the manufacture of a catalytic solid, catalytic solid and process for (co)polymerisation of olefins by means of this catalytic solid  
Catalytic solid for the (co)polymerisation of at least one olefin, comprising a coprecipitate of magnesium and of at least one transition metal, obtained by means of a process comprising the...
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...
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...
5607655 Olefin polymerization catalyst and precursor therefor  
A generally dipyramidal-shaped catalyst precursor is prepared by dissolving magnesium dichloride and a suitable alcohol in a suitable solvent and then cooling to obtain a precipitate of the desired...
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...
5571877 Method of preparing low or medium-density straight-chain polyethylene, and catalysts suitable for this purpose  
Low or medium-density straight-chain ethylene polymers are prepared by copolymerising ethylene with a C 4 -C 6 alpha-olefin at elevated temperature and pressure in a tubular reactor and in the...
5519098 Activation of catalyst in ethylene polymerization at high temperatures  
The present invention relates to a method for activating coordination catalysts suitable for the polymerization of alpha olefins using a alkoxy aluminum alkyl compound prepared by mixing an alcohol...
5489634 Method for producing a stereospecific polyolefin  
A method for producing a stereospecific polyolefin in the presence of a catalyst comprising a transition metal compound and an organometallic compound, wherein a catalyst system is used which...
5439995 Catalyst and prepolymer used for the preparation of polyolefins  
The present invention relates to a solid catalyst suitable for polymerizing olefins in a heterogeneous process, the catalyst consisting of spheroidal particles having a narrow particle size...
5426162 Production of olefin polymers  
Ziegler polymerization of α-olefins is disclosed which is characterized by a solid catalyst component and an organoaluminum component used in the Ziegler catalyst, and also by the temperature used...
5411926 Olefin polymerization catalyst  
A high activity olefin polymerization catalyst catalyzes the production of polymeric lower α-olefin having good properties. The catalyst is produced from an organoaluminum cocatalyst, a...
5408016 Process for producing ethylene polymers  
A process for producing an ethylene polymer comprising bringing ethylene or ethylene and an α-olefin having 3 to 10 carbon atoms into contact with a catalyst comprising the following components...
5382557 Procedure for the preparation of a solid component of catalyst for the (co)polymerization of ethylene  
A solid component of catalyst highly active in the (co)polymerization of ethylene containing titanium, magnesium, aluminum, chlorine and alkoxy groups, and obtained by means of a procedure wherein:...
5374695 Process for the preparaton of elastomeric copolymers of ethylene  
Process for the preparation of elastomeric copolymers of ethylene, wherein ethylene is copolymerized with an α-olefin, and possibly with a diene as termonomer, in the presence of a Ziegler-Natta...
5350818 Process for preparing a high density polyethylene of low n-paraffin content and high melt index ratio  
A process for producing a high density polyethylene resin which has a negligible n-paraffin content while having a melt index ratio of at least 75 by polymerizing ethylene with a minor amount of a...
5324805 Ethylene/pentene-1 copolymer and ethylene/pentene-1 copolymer composition  
The present invention relates to a novel ethylene/pentene-1 copolymer whose molded film has a good balance between impact resistance and tear properties and high transparency, also is prominently...
5322911 Polymerization process employing metal halide catalyst and polymer produced  
A polymerization catalyst is formed by producing a solution of a Group IIA or Group IIB halide and an alcohol; contacting the solution with an organometallic compound to form a soluble complex; and...
5322830 Method for the preparation of catalyst components for the polymerization of ethylene with a relatively narrow molecular weight distribution and protocatalyst composition  
The invention relates to a method for the preparation of a supported procatalyst intended for the polymerization of olefins, in which particles are formed from magnesium halide and alcohol, the...
5300597 Olefin polymerization catalyst and process  
A method is disclosed for preparing an olefin polymerization catalyst of improved particle size from a solution of magnesium containing component and a transition metal containing component which...
5296431 Ziegler-natta catalyst systems containing organometallic compounds  
Ziegler-Natta-type catalyst systems containing, as active constituents, a) a titanium-containing solid component which also contains magnesium, halogen and a carboxylic acid ester as electron...
5290745 Process for producing ethylene polymers having reduced hexane extractable content  
A catalyst system of the Ziegler-Natta type suitable for producing ethylene copolymers having a reduced hexane extractable content comprising (a) an organoaluminum component and (b) a titanium...
5278118 Catalysts for the preparation of elastomeric olefinic copolymers  
Catalysts for the preparation of copolymers of ethylene and/or alpha-olefins and optionally dienes, are obtained by reacting an Al-alkyl with a solid catalytic component comprising: (A) a...
5275993 Olefin polymerization catalyst  
An olefin polymerization catalyst which is obtained by contacting the following components (A) and (B): component (A): a product of contacting the following components (A 1 ) and (A 2 ): ...
5252688 Process for preparing a Ziegler-Natta type catalyst  
The present invention relates to a process for preparing a Ziegler-Natta type catalyst based on a vanadium compound. The process comprises sequentially contacting within a liquid hydrocarbon a...
5247031 Olefin polymerization catalyst component, process for production thereof, olefin polymerization catalyst, and process for polymerizing olefins  
A catalyst component (X") obtained by treating an olefin polymerization catalyst (X) formed from (A) a solid titanium catalyst component comprising magnesium, titanium, halogen and an electron...
Matches 1 - 50 out of 233 1 2 3 4 5 >