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7629284 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...
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...
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...
7288611 Methods for preparing a rare-earth cis-1,4-polybutadiene rubber with a controlled molecular weight distribution  
Disclosed herein are a method for preparing a cis-1,4-polybutadiene with a controlled molecular weight distribution, comprising polymerizing butadiene monomers using a rare-earth catalyst system...
7176266 Catalyst for vinyl compound polymerization and process for producing vinyl polymer  
A catalyst for polymerizing vinyl compounds or α-olefins according to the present invention includes (A) a transition metal complex, (B) a clay, clay mineral or ion-exchangeable layered compound,...
7098164 Process for the polymerization of olefins  
A process for the (co) polymerization of olefins of formula CH 2 ═CHR wherein R is a hydrogen atom, a methyl or an ethyl radical, carried out in the presence of a system comprising (a) solid...
7077977 Bulky borate activations  
A discrete polyolefin catalyst activator is disclosed. A salient feature of invention borate-based activators is that at least one of the ligands on the borate non-coordinating anion (NCA)...
7074736 Hydrozirconated matrix and process for polyolefin production  
A hydrozirconated matrix for the production of polyolefins is disclosed. The hydrozirconated matrix is prepared from the reaction of an organozirconium composition and an olefin based material. A...
7022793 Process for the treatment of polymer compositions  
A process for the preparation of heterophasic elastomeric polymer comprising the step of polymerizing ethylene, an alpha-olefin CH2═CHL, where L is an alkyl, cycloalkyl or aryl radical with...
7019090 Catalytic component for the polymerization of olefins obtained by impregnation of a prepolymer with a solution of a catalytic component, prepolymer obtained from the catalytic component and polymerization process using said catalytic component  
The present invention relates to a catalytic component for the polymerization of olefins combining a number of catalytic components for the polymerization of olefins and to a process for preparing...
6972271 Supported catalyst systems  
Disclosed are methods of producing supported organic catalyst systems which find particular use in polymerization reactions. The methods comprise generally, the steps of (a) providing an organic...
6867160 High activity catalyst for high molecular weight polyolefins  
By controlling the hold up times and temperatures for mixing the components of aluminum, titanium and magnesium based catalyst for solution polymerization it is possible to prepare a catalyst...
6852660 Solid metallocene catalyst system  
A solid metallocene-containing catalyst system of an organoaluminoxane, at least one metallocene having at least one olefinically unsaturated substituent and a polyolefin is disclosed. The...
6838534 Catalytic system and process for the preparation of elastomers by means of this system  
The present invention provides a catalytic system that can be used to prepare by polymerization diene elastomers comprising polyisoprenes and polybutadienes. The invention also provides a process...
6780948 Synthesis of polyisoprene with neodymium catalyst  
The neodymium catalyst system prepared by the technique of this invention can be used in the polymerization of isoprene monomer into polyisoprene rubber that is clear (transparent) and of high...
6746981 Particulate group 4 metallocene-aluminoxane catalyst compositions devoid of preformed support, and their preparation and their use  
Described are solid olefin polymerization catalysts that have, inter alia, very high productivities (at least 18,000 grams of polyethylene per gram of catalyst in one hour) as shown by a standard...
6743873 Olefin polymerization catalyst composition and preparation thereof  
A catalyst composition useful for catalyzing the polymerization of olefinic monomers is disclosed, along with a polymerization method using those catalyst compositions to prepare a variety of...
6677265 Process of producing self-supported catalysts  
The process features concurrent feeds into the liquid phase of a prepolymerization reaction mixture. These feeds are: a) separate continuous or substantially continuous feeds of (i) a...
6605563 Catalyst system and its use in olefin polymerization  
A polymerization catalyst system and a method for preparing the catalyst system is disclosed. The catalyst system includes a bulky ligand metallocene catalyst compound, preferably containing a...
6551956 Catalytic component for the polymerization of olefins obtained by impregnation of a prepolymer with a solution of a catalytic component, and the prepolymer obtained from the catalytic component  
The present invention relates to a catalytic composition for the polymerization of olefins combining a number of catalytic components for the polymerization of olefins and to a process for...
6551955 Particulate group 4 metallocene-aluminoxane catalyst compositions devoid of preformed support, and their preparation and their use  
Described are solid olefin polymerization catalysts that have, inter alia, very high productivities as shown by a standard test procedure for measuring this property or characteristic, and...
6541411 Titanium/zirconium catalysts and their use to prepare esters or polyesters  
The invention relates to novel titanium/zirconium catalysts, and to a process for the preparation of these titanium/zirconium catalysts. The process comprises reacting orthoesters or condensed...
6534609 Method for making and using a metallocene catalyst system  
Methods are disclosed for preparing a highly active solid metallocene-containing catalyst system and its use in the polymerization of olefins. The catalyst system is prepared by creating a catalyst...
6518214 Synthesis of functionalized lithium initiator  
This invention discloses a process for making dilithium initiators in high purity. This process can be conducted in the absence of amines which is desirable since amines can act as modifiers for...
6482967 Metallocenes, polymerization catalyst systems, their preparation, and use  
Metallocenes having a 9-fluorenyl group and another cyclic dienyl group connected by a single carbon having a terminally unsaturated hydrocarbyl substituent wherein the 9-fluorenyl group has a...
6482764 Method for producing a supported catalyst for ethylene polymerization and ethylene/α-olefin copolymerization  
A method for producing a supported catalyst useful in polymerization of ethylene and copolymerization of ethylene and α-olefin is disclosed. The method includes treating the magnesium-containing...
6458904 Catalyst for the (co)polymerization of alk-1-enes  
A catalyst composition suitable for the (co)polymerization of alk-1-enes is obtainable by mixing a metallocene complex with a C 3 -C 20 -alk-1-ene in an inert solvent, reacting the resulting...
6455649 Catalyst for producing living olefin polymer and process for producing the polymer  
A catalyst comprising an organoaluminum compound and a vanadium chelate compound having the lability to cause olefins to undergo living coordination polymerization is contacted with a terminal...
6426314 Hydrogen scavengers  
There has been invented a codeposition process for fabricating hydrogen scavengers. First, a π-bonded allylic organometallic complex is prepared by reacting an allylic transition metal halide with...
6413901 Highly active, supported ziegler-natta catalyst systems for olefin polymerization, methods of making and using the same  
A catalyst composition for alpha olefin polymerization is provided. The catalyst composition is prepared by a process including treating PVC containing particles with an organomagnesium compound in...
6403739 Supported catalytic system for the production of ethylene propylene copolymers  
Catalytic component for the polymerization of ethylene with propylene prepared by: a) impregnation of an inert support with a solution of a compound of Vanadium having an oxidation state of...
6383969 Process for the preparation of a catalytic composition for the polymerization of alpha-olefins, catalytic composition obtained and polymerization process using such a catalytic composition  
Disclosed is for the preparation of a catalytic composition for the polymerization of alpha-olefins. The catalyst comprises a compound of a transition metal (i) of Groups 4 to 6 of the Periodic...
6350714 Method for preparing a catalyst and catalysts prepared accordingly  
The present invention relates to a process for preparing a catalyst by activating a catalytic composition which comprises a) at least one metal of group IB or IIB or a compound thereof, b) where...
6335405 Catalysts for olefin polymer production and process for producing olefin polymer  
Catalysts for olefin polymerization comprising (a) a compound of a transition metal of Groups 8 to 10 of the Periodic Table, (b) clay, a clay mineral or an ion-exchanging layered compound, (c) a...
6291382 Metallocenes, polymerization catalyst systems, their preparation, and use  
Metallocenes having a 9-fluorenyl group and another cyclic dienyl group connected by a single carbon having a terminally unsaturated hydrocarbyl substituent wherein the 9-fluorenyl group has a...
6255247 Optimum external co-catalyst electron donor molar ratio in propylene polymerization  
This invention is for a process for the polymerization of propylene to a minimum level of xylene solubles by use of the molar ratio of co-catalyst to external electron donor (selectivity control...
6239060 Supported metallocene catalyst system and method for polymerizing olefins  
The present invention provides a new type of supported metallocene catalyst system. In one aspect of the invention, an inorganic oxide support, such as silica, is impregnated with a Group XIII...
6235854 Solid titanium catalyst component and its use in olefin polymerization catalyst  
The invention provides a process for preparing a solid titanium catalyst component for use in the preparation of an olefin polymerization catalyst, which comprises: (1) a step wherein a...
6228791 Solid catalyst component and catalyst for olefin polymerization  
The present invention is a solid catalyst component for polymerization of olefins prepared by contacting a magnesium compound, a tetravalent halogen-containing titanium compound, a diester of an...
6218330 Process for preparing and using a supported metallocene-alumoxane catalyst  
A process for the preparation of supported metallocene-alumoxane catalysts comprising the steps of: a) reacting a metallocene with an alumoxane at a temperature comprised between 15 and 50° C.,...
6184170 Metallocene catalyst systems  
This invention relates generally to metallocene catalyst systems and to methods for their production and use. Specifically, this invention relates to a method for preparing metallocene catalyst...
6136743 Olefin polymerization catalyst, olefins polymerization methods, and olefin polymer compositions, and heat molded products  
The invention provides catalysts which have a high polymerization activity, enable the obtaining of olefin polymers of wide molecular weight distribution, and which comprise (a)(a-1) a metallocene...
6124231 Supported catalyst system, processes for its preparation, and its use for the polymerization of olefins  
The present invention relates to a supported composition, to processes for its preparation and to its use for polymerizing olefins. The supported catalyst composition comprises at least one...
6124229 Process for the preparation of metallocene catalyst systems on inert support material using gas phase reactor  
Disclosed is a process for preparing a supported metallocene catalyst by introducing, in a first stage, a gas stream comprising an organoaluminum compound, an inert support material and water, into...
6117957 Process for polymerization of olefins with silicon bridged metallocene catalyst systems  
A process for polymerization of olefins having increased molecular weight and melting point uses a catalyst formed by combining a chiral, stereorigid metallocene compound with an organoaluminum...
6114276 Catalyst system for olefin polymerization and its use  
A heterogeneous catalyst system comprising a novel titanium catalyst component, the product of a sequential reaction of titanium halide with carbodiimide compound and an organometallic aluminum...
6087291 Polymerization catalyst systems  
This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The method for supporting the catalyst system of the invention provides for a metallocene...
6077804 Olefin polymerization catalyst and process for preparing polyolefins  
According to the present invention, there are provided a catalyst and a process for the preparation of polyolefins having a relatively wide molecular weight distribution, good particle properties,...
6071846 Olefin polymerization catalyst and a polyolefin production method  
An olefin polymerization catalyst comprising (A) a solid titanium catalyst component containing a magnesium atom, titanium atom, halogen atom and electron donor, in which divalent titanium atom...
6060416 Prepolymerized solid catalyst, process for preparing the same, and process for heterogeneous polymerization of olefins  
A high-performance prepolymerized solid catalyst is prepared by polymerizing an olefin onto an olefin polymerization catalyst in a heterogeneous system under irradiation with an elastic wave,...
Matches 1 - 50 out of 195 1 2 3 4 >