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7427653 Catalyst components for the polymerization of olefins  
A catalyst component for olefin (co)polymerization, and in particular for the preparation of LLDPE, comprising Mg, Ti, halogen and an electron donor compound (ED) belonging to ethers, esters,...
6911507 Processes for producing cycloolefin addition polymer  
A cyclic olefin having a specific polar group is polymerized by addition polymerization in a hydrocarbon solvent, using a polymerization catalyst component containing (i) a specific transition...
6677423 Polymerization of ethylene  
Polyethylene is formed by contacting ethylene with a novel iron or cobalt complex of a selected 1,4,7-triaza-3-oxa-1,4,6-heptatriene or 2,5,8-triaza-1,8-nonadiene, optionally in the presence of a...
6127305 Catalyst and process for polymerizing alpha-olefins  
An active catalyst in the polymerization of alpha-olefins is obtained by: (i) bringing a dialkyl magnesium, or an alkyl magnesium halide into contact with a silicon or tin halide, in solution in...
6034258 Polymerization catalysts containing β-diketiminate ligands  
Transition metal complexes of the formula I L m MX n I, where L is a ligand of the formula II ##STR1## m is 1 or 2, M is a titanium, zirconium,...
5886202 Bridged fluorenyl/indenyl metallocenes and the use thereof  
Bridged fluorenyl/indenyl metallocenes having substituents at the 3 position of the indenyl and the use thereof in the polymerization of olefins are disclosed. Also a new method for preparing...
5866663 Processes of polymerizing olefins  
Disclosed herein are processes for polymerizing ethylene, acyclic olefins, and/or selected cyclic olefins, and optionally selected olefinic esters or carboxylic acids, and other monomers. The...
5852145 Polymerization processes for olefins  
Certain olefins such as ethylene, α-olefins and cyclopentene can be polymerized by using catalyst system containing a nickel or palladium α-diimine complex, a metal containing hydrocarbylation...
5731254 Process for the preparation of a syndiotactic polyolefin  
A syndiotactic polyolefin is obtained in a high yield by polymerization or copolymerization of an olefin of the formula R a --CHCH--R b in the presence of a catalyst consisting of a...
5508245 Spherical components and catalysts for the polymerization of olefins  
Spherical components of catalysts for the polymerization of olefins comprising: (a) a vanadium compound selected from the compounds of formula VOX 2 Y or VX n Y n -4n, where X is Cl or Br and...
5502126 Process for the synthesis of isoprene butadiene rubber  
The subject invention relates to a technique for synthesizing rubbery non-tapered, random, copolymers of 1,3-butadiene and isoprene. These rubbery copolymers exhibit an excellent combination of...
5498676 Process for olefin polymerization  
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...
5491205 Preparation of polymers of C.sub.2 -C.sub.10 -alk-1-enes using racemic metal-locene complexes as catalysts  
Polymers of C 2 -C 10 -alk-1-enes are prepared at from 0.5 to 3000 bar and from -50° to 300° C. using a catalyst system by a process in which the catalyst system used is one which contains, as...
5438093 Modified polycycloolefins  
Solution and RIM polymerization of cycloolefins containing at least one norbornene moiety is carried out in the presence of a methathesis catalyst system and an activator, particularly a...
5416179 Catalyst compositions and olefin polymerization  
A process for the polymerization of mono-1-olefins employing a catalyst composition comprising a metallocene compound and isobutene. The catalyst composition exhibits improved productivity. In a...
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...
5391659 Polymerization process employing lanthanide halide catalyst and polymer produced  
A polymerization catalyst is formed by producing a solution of a halide of scandium, yttrium, or a rare earth metal and an alcohol; contacting the solution with an organometallic compound to form a...
5310716 Catalyst for the polymerization of olefins  
A supported solid component of catalyst, for the stereospecific polymerization of propylene and other α-olefins, is obtained by making a non-activated silica interact in succession with: (i) a...
5296432 Catalyst for the (co) polymerization of ethylene  
Solid component of catalyst for the (co)polymerization of ethylene, including magnesium, halogen and titanium, obtained by: (i) dissolution, in an inert organic solvent, of a magnesium dialkyl,...
5292837 Process for the preparation of ethylene (co)polymers  
For the homopolymerization of ethylene or for the copolymerization of ethylene with other 1-olefins, a catalyst is used which comprises a trialkylaluminum compound and the entire product from the...
5204304 Vanadium-containing polymerization catalyst  
A vanadium-containing catalyst is prepared as the product of admixing an inorganic oxide, inorganic phosphate or mixtures thereof, a zinc-containing composition, and a vanadium-containing...
5118769 Manufacturing method of polyolefin  
A manufacturing method of polyolefin is disclosed wherein the catalyst used for the polymerization of α-olefins at a temperature lower than the melting point of polymer in the presence of said...
5096970 Prepolymerization process for producing a conjugated diene compound prepolymer solution  
A conjugated diene compound prepolymer solution useful for the production of a vinyl aromatic compound high impact polymer material is produced by a process in which a prepolymerization mixture is...
4977226 Process for production of molded article of norbornene polymer  
Process for production of a molded article comprising polymerizing a norbornene monomer having bicyclic or higher cyclic structure in the presence of a metathesis catalyst system and a viscosity...
4952649 Process for producing olefin polymers or copolymers and catalyst components used therefor  
A solid titanium catalyst component (A) of a catalyst system useful in the polymerization of olefins or copolymerization of two or more olefins or one or more olefins and a diene is prepared by...
4885349 Process for polymerizing alpha-olefin polymers of relatively narrow molecular weight distribution and high melt index  
A catalyst composition for polymerizing alpha-olefins is prepared by treating a carrier with a mixture of at least one organo-magnesium composition of the formula (OR') n Mg(OR) m ...
4849483 Process for producing a catalyst component for polymerization of olefins  
A process for producing a catalyst component for polymerization of olefins which comprises contacting (a) a metal oxide with (b) a magnesium alkoxide, contacting the resulting contact product with...
4719271 Polymerization of olefins  
A catalyst, a process of forming the catalyst, and polymerizing at least one alpha-olefin with the catalyst, said catalyst produced by precipitating a composition from a solution of a metal halide,...
4699961 High efficiency catalysts for varying olefin polymer molecular weight distribution  
Catalysts having high efficiency in preparing olefin polymers while controlling molecular weight distribution are disclosed. The catalysts utilize magnesium siloxide supports and the product...
4649182 Polymerization catalysts and methods of preparation thereof  
The catalysts are composed of an organometallic compound and a solid catalytic component which is the reaction product of a transition metal derivative and a solid support having a composition, at...
4625003 Catalyst component for polymerization of olefins (P-1026)  
A titanium halide containing catalyst component for polymerization of olefins which is prepared by reacting a magnesium hydrocarbyloxide with a silicon compound having at least one hydrogen-silicon...
4613655 Catalysts for the polymerization of olefins  
New catalysts for the polymerization of olefins and more particularly of ethylene and mixtures thereof with higher alpha-olefins and/or diolefins, are disclosed. The catalysts are prepared by...
4603184 Process for producing alpha-olefin polymers  
A process for producing α-olefin polymers is proposed wherein the catalyst prepared and used therein is superior in the shelf stability and heat stability. The process comprises reacting TiCl 4 ...
4603183 Hydrocarbon soluble catalyst supports and resultant polymerization catalysts  
A method is provided for preparing hydrocarbon soluble magnesium siloxide supports comprising contacting such supports with sufficient aluminum alkoxide or organic ethers to render the supports...
4537938 Process for preparing polyolefins  
Provided is an olefin-polymerization catalyst comprising the combination of the following components [I] and [II]: [I] a solid component obtained by intercontacting and reacting the following...
4533705 Process for producing α-olefin polymers  
A process for producing α-olefin polymers having high crystallinity and good particle form, with a high yield is provided. The polymerization therefor is carried out in the presence of a...
4518752 Process for polyolefins production  
A process for the homopolymerization or copolymerization of olefins is disclosed, which is carried out in the presence of an improved catalyst comprising a solid catalyst component and an...
4499247 High-rigidity, high-melt-viscoelasticity polypropylene and process for producing the same  
A superior high-rigidity and high-melt-viscoelasticity polypropylene for sheets to be post-processed and for blow molding is provided which polypropylene is produced by subjecting propylene to a...
4495338 Components of catalysts for the polymerization of olefins  
Catalysts useful in the polymerization of olefins, more particularly of ethylene and mixtures thereof with alpha-olefins and/or diolefins, are disclosed. The new catalysts are obtained by mixing a...
4483971 Process for producing terpolymers of propylene, ethylene and another .alpha .  
A process for producing terpolymers of propylene (as a main monomer), ethylene and another α-olefin having superior and well-balanced physical properties, almost without forming soluble polymer is...
4476289 Catalysts for the polymerization of olefins  
Catalysts useful in the polymerization of olefins, more particularly of ethylene and mixtures thereof with higher alpha-olefins and/or diolefins, are disclosed. The new catalysts are obtained by...
4464478 Catalyst components and catalysts for polymerizing olefins  
Catalyst-forming components are prepared from (a) a halogenated Ti compound containing at least a Ti-halogen bond; (b) an electron-donor compound free of active hydrogen atoms; and (c) the...
4451626 Process for polymerizing alpha-olefins  
Alpha olefins are polymerized in the presence of catalyst compositions which are the catalytic reaction products of (A) the reaction product or complex resulting from the mixing of (1) a mixture of...
4446289 Polymerizing and copolymerizing olefinically unsaturated compounds and means therefor  
A novel process is disclosed for polymerizing and copolymerizing alpha olefins (ethylene included) also in the presence of conjugated diolephins, and more particularly for copolymerizing ethylene...
4429089 Polymerizing and copolymerizing diolefines, and means therefor  
A novel catalytic system is disclosed which is especially adapted for the polymerization and the copolymerization of aliphatic conjugated diolefines, the system comprising an organic compound of...
4429087 Polymerization catalyst and process  
A transition metal compound such as titanium tetrahydrocarbyloxides and a metal hydrocarbyloxide compound such as magnesium hydrocarbyloxides are chemically combined to form a first catalyst...
4419501 Olefin polymerization catalyst components and polymerization process  
A process for the preparation of an olefin polymerization catalyst component which comprises contacting a solid composition obtained by combining a magnesium halide, an electron donor and a...
4418184 Process for preparation of ethylene polymer wax  
Improved process for preparing an ethylene polymer wax which comprises polymerizing ethylene or copolymerizing ethylene with up to 10 mole % of an alpha-olefin having 3 to 20 carbon atoms in the...
4415712 Polymerizing olefins with catalysts containing the reaction product of a transition metal compound and a boron compound  
Alpha-olefins are polymerized in the presence of a catalyst which is the catalytic reaction product of (A) the reaction product or complex formed by mixing at a temperature for a time sufficient...
4410671 Catalyst, method of producing the catalyst, and polymerization process employing the catalyst  
A transition metal compound and a metal halide compound are chemically combined to form a composition of matter. The composition of matter is mixed with a precipitating agent to form an active...
Matches 1 - 50 out of 212 1 2 3 4 5 >