Matches 301 - 350 out of 526 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
4975403 Catalyst systems for producing polyolefins having a broad molecular weight distribution  
The invention provides catalyst systems for use in the polymerization of olefins to produce a polymer product having a broad molecular weight distribution. The catalyst system includes at least two...
RE33452 Method for making alkylhalosilanes  
A method is provided for making alkylhalosilanes by effecting reaction between an alkyl halide, such as methyl chloride and powdered silicon in the presence of a copper-zinc-tin catalyst....
4956323 Catalysts prepared from tetrakis(dialkylamide or diarylamide) derivatives of titanium and polymerization of olefins therewith  
Ziegler-Natta catalysts for polymerizing α-olefins are prepared by the addition of tetrakis(dialkylaminde or diarylamide) derivatives of titanium, and a metal-containing reducing agent such as...
4952540 Finely divided aluminoxane, process for producing same and its use  
A finely divided aluminoxane comprising an aluminoxane represented by formula [I] or [II] ##STR1## wherein R denotes a hydrocarbon group having 1 to 10 carbon atoms and m denotes an integer of 2 to...
4948770 Method for crystallizing magnesium chloride and method for using in a catalyst composition  
Disclosed is a method for making crystalline magnesium halide particles usable for preparing catalyst and usable in the polymerization of alpha olefins having the formula MgnEmXp * y ROH wherein y...
4940682 Solid catalyst component for olefin polymerization  
A solid catalyst component for olefin polymerization which comprises a catalyst component comprising at least titanium and chlorine fixed onto a porous substance of which the pore volume, at a pore...
4937299 Process and catalyst for producing reactor blend polyolefins  
Polyolefin reactor blends obtained by polymerization of ethylene and higher alpha-olefins in the presence of a catalyst system comprising two or more metallocenes and alumoxane.
4918038 Process for the production of polyethylene with a broad and/or bimodal molecular weight distribution  
A process for the production of an ethylene homopolymer or copolymer comprising passing ethylene with or without at least one alpha-olefin comonomer having 3 or more carbon atoms into contact with...
4918039 Binuclear metathesis polymerization catalyst system  
A metathesis polymerization catalyst composition comprising a binuclear catalyst, wherein said binuclear catalyst is a mixture of at least two transition metal components, wherein a first...
4912074 Catalyst composition for preparing high density or medium density olefin polymers  
There is disclosed a catalyst composition for the polymerization of olefins, particularly alpha-olefins. The composition is prepared by synthesizing a catalyst precursor and then combining it with...
4877763 Supported chromium oxide/boron catalyst  
A catalyst system useful for the polymerization of ethylene and other α-olefins comprising (a) a silica-supported chromium oxide catalyst and (b) a dihydrocarbylboron monohydrocarbyloxide...
4874734 Process for producing solid catalyst for polymerization of olefins  
A process for producing a solid catalyst for polymerization of olefins, which comprises bringing a solution of an aluminoxane into contact with a suspension of a particulate carrier having...
4870041 Process for the oligomerization of alpha olefins and catalyst therefor  
A process for the preparation of alpha olefin oligomers having predominantly terminal unsaturation using a catalyst system comprising an alkyl aluminum halide component and a second component...
4864005 Preparation of homopolymers and copolymers of α-monoolefins using a Ziegler catalyst system  
A process for the preparation of homopolymers and copolymers of α-monoolefins by polymerization of the monomer or monomers using a Ziegler catalyst system comprising (1) a transition metal...
4859733 Polyolefin compositions containing trialkanolamines  
A method is disclosed for the reduction of the extractability of trialkanolamines from polyolefins containing such compounds e.g. as a result of the use of trialkanolamines as catalyst deactivators...
4849390 Catalysts for polymerization of olefins  
A catalyst for polymerization of olefins is disclosed which comprises a titanium and/or vanadium compound supported on a silicon and/or aluminum oxide carrier. This carrier has peculiar...
4831090 Preparation of homopolymers of ethene and copolymers of ethene with higher α-monoolefins using a Ziegler catalyst system  
Homopolymerization and copolymerization of ethene are carried out using a Ziegler catalyst system consisting of (1) a transition metal catalyst component prepared by a method in which (1.1) first...
4822763 Catalyst component for polymerization of olefin  
A catalyst component for polymerization of olefin, comprising a contact product of a component (A) which is a solid component containing titanium having at least one OR 1 group (where R 1 ...
4816432 Catalyst composition for polymerizing alpha olefins  
A modified catalyst for polymerizing alpha-olefins, for example, ethylene, is prepared by combining a chromium-compound-comprising catalyst, supported on a refractory oxide support with at least...
4769428 Solution process for the preparation of polymers of alpha-olefins  
A solution process, and a catalyst therefor, for the preparation of high molecular weight polymers of alph-olefins viz. homopolymers of ethylene and copolymers of ethylene and C 3 -C 12 ...
4717701 Olefin polymerization  
Density and flexural modulus of olefin polymers can be controlled using a chromium catalyst on a iron and aluminum phosphate and/or polyphosphate gel base.
4711865 Olefin polymerization catalysts, production and use  
A catalyst for the polymerization of olefins, said catalyst comprising a transition metal containing support catalyst component and an aluminum alkyl cocatalyst, said transition metal containing...
4705835 Preparation of homopolymers and copolymers of α-monolefins using a Ziegler catalyst system  
α-Monoolefins are polymerized using a Ziegler catalyst system comprising (1) a transition metal catalyst component and (2) an organoaluminum catalyst component, in which (1) is a solid-phase...
4681866 Polymerization catalyst, method of making and use therefor  
Polymerization catalyst consisting essentially of treated silica support and zerovalent chromium compound is provided, as well as process for preparation and polymerization process with the...
4663404 Method for the polymerization of ethylene and for the copolymerization of ethylene with alpha-olefins and catalysts for use in the method  
Method for the polymerization of ethylene and for the copolymerization of ethylene with alpha-olefins to give polymers and copolymers particularly suited to working by blow-moulding, by using a...
4659685 Heterogeneous organometallic catalysts containing a supported titanium compound and at least one other supported organometallic compound  
Catalyst compositions are disclosed which are a combination of a supported titanium compound such as titanium tetraisopropoxide supported on magnesium dichloride and at least one other supported...
4657883 Ester-modified olefin polymerization catalyst  
An olefin polymerization catalyst component comprises an organoaluminum-reduced titanium trihalide on which a pretreatment amount of olefin polymer has been placed complexed with an alkyl aliphatic...
4656151 Intermetallic compound  
An intermetallic compound is disclosed formed by (a) mixing a compound having the structural formula R(R')Mg where R and R' are the same or different and are hydrocarbyl of 1 to 10 carbon atoms...
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...
4647550 Catalyst component for polymerization of olefins  
A catalyst component for the polymerization of olefins which is prepared by contacting a contact reaction product of (a) a metal oxide, (b) an organic magnesium compound, and (c) an alkoxy...
4629714 Intermetallic compounds and catalytic use thereof  
An intermetallic compound is disclosed. The compound is formed by reacting a first reaction product, the first reaction product being the product of reaction of a polymeric transition metal oxide...
4623634 Low temperature catalysts for methanol production  
A catalyst and process useful at low temperatures (below about 160° C.) and preferably in the range 80°-120° C. used in the production of methanol from carbon monoxide and hydrogen is disclosed....
4617284 Catalyst component for polymerization of olefins and process for production thereof  
A catalyst component for polymerization of olefins, which consists essentially of a particulate contact reaction product of an average particle size of 10 to 100 microns, obtained by contacting the...
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...
4612300 Novel catalyst for producing relatively narrow molecular weight distribution olefin polymers  
Polymers of α-olefins having a relatively narrow molecular weight distribution are prepared by employing a Ziegler-Natta magnesium halide supported catalyst containing both titanium and vanadium.
4610974 Intermetallic compounds of Lewis base bridged transition metal-reducing metal complexes and catalytic use thereof  
Lewis base-bridged intermetallic compounds comprising the reaction product of a transition metal alkoxide with a reducing metal having a higher oxidation potential than the transition metal in the...
4591577 Solid catalyst component for alpha-olefin polymerization and process for producing same  
A solid catalyst component for α-olefin polymerization which, when produced, causes any troubles due to its small particle size and when used, yields a spherical polymer of a suitably less...
4588703 Polyolefin polymerization process and catalyst  
An olefin polymerization catalyst prepared by reacting a metal dihalide and a transition metal, then reacting that component with a precipitating agent, and then reacting the resulting solid with...
4582816 Catalysts, method of preparation and polymerization processes therewith  
Method for the production of milled supports useful for the preparation of mono-1-olefin polymerization catalysts is provided by comminuting Mg(O)mX 2 -m or Mn(O)mX 2 -m, and high density...
4578373 Polymerization catalyst system  
An olefin polymerization catalyst system comprising (I) a polymerization catalyst produced by treating an inert support material, preferably a hydrated high surface area silica support having 1.00...
4568659 Preparation of a transition metal catalyst component for Ziegler catalyst systems  
A transition metal catalyst component (1) for Ziegler catalyst systems is prepared by (1.1) first combining (1.1.1) an inorganic oxidic substance (I), as the carrier, with (1.1.2) a solution (II)...
4567153 Polymerization catalyst comprising copulverized solid magnesium compound and solid halide of scandium  
An olefin polymerization catalyst produced by copulverizing a magnesium compound and a scandium halide, such as magnesium chloride and scandium chloride which is thereafter treated with one or more...
4556648 Solid catalyst component for olefin polymerization  
A solid catalyst component for olefin polymerization which is produced by reacting (A) a silicon compound with (B) a compound of transition metal of Groups IVa, Va and VIa of the periodic table to...
4551439 Solid catalyst component for olefin polymerization and process for producing same  
A solid catalyst component for olefin polymerization having a high polymerization activity and affording a highly stereoregular polymer having a good particulate form, and a process for producing...
4550094 Solid catalyst component for olefin polymerization  
A solid catalyst component for olefin polymerization comprising a hydrocarbon-insoluble product (III) obtained by reacting (A) a silicon compound selected from the group consisting of (1)...
4550093 Alumina-based aerogel supported transition metal catalyst useful as a Ziegler-Natta olefin polymerization catalyst and process for preparing same  
A new polymerization catalyst system comprising an aluminum compound and a transition metal compound on an alumina-based aerogel support, a process for preparing the polymerization catalyst system...
4547473 Process for the preparation of polymers of alpha-olefins at high temperatures  
A solution process for the preparation of high molecular weight homopolymers of ethylene and copolymers of ethylene and C 3 -C 12 α-olefins is disclosed. The process involves feeding monomer, a...
4540680 Intermetallic compounds of polymeric transition metal oxide alkoxides and catalytic use thereof  
An intermetallic compound comprising the reaction product of a transition metal and a reducing metal of a higher oxidation potential than the transition metal obtained by the reaction of a...
4537869 Tetravalent titanium treated calcined vanadium catalyst with trialkylaluminum cocatalyst  
A supported vanadium catalyst is provided by impregnating a vanadium compound onto a refractory support, subjecting the resulting support to calcination and thereafter contacting with a titanium...
4525468 Olefin polymerization catalyst  
High activity catalysts for the polymerization of ethylene and other α-olefins are made by contacting a soluble magnesium compound of the general formula Mg(OSiR 1 R 2 R 3 ) 2 , wherein each of...
Matches 301 - 350 out of 526 < 1 2 3 4 5 6 7 8 9 10 11 >