Matches 351 - 400 out of 527 < 1 2 3 4 5 6 7 8 9 10 11 >
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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...
4525551 Highly active and efficient polyolefin catalyst  
This invention relates to a novel highly active and more efficient catalyst system for polymerizing alpha-olefins to prepare high, medium, and low molecular weight polymers. This highly active...
4518751 Process for the production of polyethylene  
A process for the production of polyethylene having a wide molecular weight distribution and good molding and good physical properties. It is produced using a catalyst consisting of components (A)...
4517345 Polymerization process  
A process and catalyst for polymerizing olefins, especially ethylene or a mixture of ethylene with up to 40 wt % (based on total monomer) or other 1-olefinic monomer, the process comprising (a)...
4506029 Supported catalyst for polymerization of olefins  
A catalytic component for polymerizing olefins comprises a solid support containing magnesium-halogen or manganese-halogen bonds, a transition metal halide of a metal selected from Groups IVB and...
4506027 Method of preparing a supported Ziegler-catalyst for the polymerization of alpha-olefins  
Method of preparing a supported Ziegler-catalyst active in the polymerization of alpha-olefins to polymers particularly suited to working by blow-moulding, by reacting: (A) an organometallic...
4504592 Polymerization catalyst for the preparation of ethylene polymer  
An improved process for the preparation of a catalyst for the polymerization of ethylene, and an improved process for preparing an ethylene polymer therewith. An improved supported...
4496660 Catalyst prepared from organo-magnesium compound; oxygen- or nitrogen-containing compound; halide source; transition metal compound and reducing agent  
A catalyst for polymerizing olefins is the reaction product of (A) the reaction product of (1) the reaction product of (a) an alkyl magnesium compound such as dibutylmagnesium, with (b) an...
4487845 Method of enhancing stereospecificity of a catalyst system  
A novel catalyst system for the polymerization of alpha-olefins is provided. The catalyst system is produced by a process comprising heating to an effective temperature for an effective length of...
4487844 Benzenediazonium tetrafluoroborate/titanium tetrahalide-based catalysts  
A catalyst system is provided comprising a titanium catalyst component produced by contacting a benzenediazonium tetrafluoroborate with a titanium tetrahalide such as titanium tetrachloride and a...
4483938 Polymerization of ethylene or ethylene/α olefin mixtures in the presence of improved titanium/vanadium catalyst  
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...
4478952 Supported catalyst for olefin polymerization  
A method for the preparation of supported Ziegler-Natta catalysts comprising contacting a transition metal alkoxide and/or siloxide compound with a magnesium-containing reagent. The magnesium...
4472523 Zirconium-titanium catalyzed olefin polymerization  
Olefins such as ethylene can be polymerized in high productivities using a catalyst system wherein one catalyst component comprises a precipitated complex of zirconium tetrahydrocarbyloxide and/or...
4458028 Process for preparing a polymerization catalyst and preparation of ethylene polymers with this catalyst  
This invention relates to a process for forming a catalyst containing chromium and vanadium, by depositing chromium- and vanadium compounds on an inert, particulate inorganic support. The chromium...
4458027 Olefin polymerization catalysts  
Reaction products of organic magnesium compounds and silyl esters and/or poly (silyl esters) are contacted with transition metal compounds to yield active polymerization catalysts. In a preferred...
4454242 Catalyst for polymerization of olefins  
A catalyst suitable for use in the polymerization of olefins is disclosed. This catalyst contains: [A] a solid catalyst component obtained by calcining (a) a zirconium compound represented by...
4450242 Catalyst for polymerizing olefins  
A novel catalytic system for polymerizing olefins comprises: (a) a cocatalytic component containing an organometallic compound of Groups I-III of the periodic table, and (b) a catalytic...
4439538 Supported catalyst for polymerizing olefins  
A novel catalytic system for polymerizing olefins comprises: (a) a component containing an organometallic compound of Groups I-III of the periodic table, and (b) a component containing...
4425257 Supported high efficiency polyolefin catalyst component and methods of making and using the same  
A supported high efficiency catalyst component for polyolefin production and methods of making and using the same are disclosed. A catalyst support made from a solid, particulate support material,...
4403081 Method for producing α-olefin polymers  
A method for producing α-olefin polymers is provided. This method provides products having superior properties such as higher bulk density and uniform particle form which is close to sphere, with...
4399053 High efficiency catalyst containing titanium, zirconium and zinc for polymerizing olefins  
Compositions exhibiting high catalytic activity in the polymerization of α-olefins are prepared by reacting trivalent or tetravalent titanium compounds such as titanium tetraalkoxides, zirconium...
4399056 Organo zirconium-chromium mixtures, catalyst prepared therefrom and polymerization of olefins therewith  
Ziegler-type catalysts are modified using zirconium compounds such as zirconium octoate and/or chromium compounds such as chromium octoate. These compounds are useful in modifying the catalysts for...
4397763 Catalyst and process of polymerization of alpha-monoolefins  
Polymerization of alpha-monoolefins employing a catalyst comprising (A) a milled admixture of a titanium halide, anhydrous magnesium or manganous chloride, optionally a Lewis base, and (B) a...
4397762 Polymerization catalyst  
A supported Ziegler catalyst prepared by the following steps, carried out under anhydrous conditions: (A) reacting a hydroxyl groups-containing support material comprising magnesium silicate or...
4392983 Transition metal composition, production and use  
A transition metal composition has the composition M m ,X p ,TYn'Z where M is a metal of Groups Ib, IIa, IIIb, VIIa or VIII of the Periodic Table, X is an anion, T is a transition metal of Groups...
4390454 Catalyst components for polymerizing olefins  
There are disclosed components of catalysts for polymerizing ethylene and mixtures of ethylene with alpha-olefins comprising the reaction product of (A) a magnesium compound, such as Mg-chloride,...
4389518 Process for producing polyethylene  
A process for producing polyethylene having a superior form and a narrower molecular weight distribution with a higher polymer yield is provided. In this process, a combination of a solid product...
4388219 Catalyst for polymerizing ethylene, comprising compounds of several transition metals, and a polymerization process using said catalyst  
A catalyst for polymerizing ethylene, especially at high temperature and high pressure, comprising at least two halogen compounds of transition metals, one of which is a titanium trichloride...
4382020 Process for the preparation of an olefin polymerization catalyst  
An improved process for the preparation of a catalyst for the polymerization of ethylene, and an improved process for preparing an ethylene polymer therewith. An improved supported...
4380616 Polymerization of olefins in the presence of chromium-containing catalysts  
Olefins are polymerized in the presence of chromium-containing catalysts which have been improved by depositing the chromium onto the inorganic oxide support in the vapor phase rather than as an...
4379074 Chemical composition based on titanium trihalide, a method for its preparation, and a process for the polymerization or copolymerization of unsaturated compounds which uses this composition  
This application relates to a process for the homopolymerization (or copolymerization) of unsaturated compounds, particularly ethylene and higher alpha olefines, to give homopolymers (or...
4378455 Process for bulk alternating copolymerization of propylene and butadiene  
The present disclosure relates to a process for alternating copolymerization of propylene and butadiene in the absence of a polymerization solvent. The disclosure contains information relative to...
4378304 Catalyst and methods  
A catalyst, a method of preparing a catalyst and method of polymerizing olefins with the catalyst in which the catalyst is prepared by reacting a support with a Group IIA organometallic compound...
4376065 Organo zirconium-chromium compound, catalyst prepared therefrom and polymerization of olefins therewith  
Dual transition metal compounds containing zirconium and chromium are prepared by reacting a tetrahydrocarbyloxy zirconium compound such as tetraisopropoxy zirconium or a tetravalent hydrocarbyloxy...
4371627 Process for the catalytic synthesis of methane by reacting hydrogen with carbon monoxide  
Methane is obtained by reacting hydrogen with carbon monoxide in the presence of a catalyst manufactured by reacting a nickel compound with a reducing aluminum compound in the presence of a...
4368305 Process for producing olefin polymers  
A process for producing polyolefins and particularly polyethylene which are high in molecular weight or which are wide in molecular weight distribution and thus suitable for extrusion or blow...
4368302 Polymerization process and products therefrom  
A process and catalyst for polymerizing 1-olefins, for example ethylene, the process comprising (a) supporting a chromium compound on a refractory oxide support material, (b) adding one or more...
4366297 Process for producing olefinic copolymer rubber with improved titanium compound containing catalyst system  
In a process for producing a rubber olefin copolymer which comprises random copolymerization of at least two olefins in the presence of a catalyst composed of (A) a titanium compound and (B) an...
4356160 Process for producing titanium trihalides by reducing titanium tetrahalides  
In a process for producing a titanium trihalide by reducing a titanium tetrahalide with hydrogen, the improvement wherein the reduction is carried out in an organic solvent in the presence of an...
4335229 Process for polymerizing an α-olefin  
A process for polymerizing an α-olefin comprising contacting the olefin in liquid phase at a temperature of about 120° to about 320° C. with a catalyst comprising a component (A) and an...
4333851 Olefin polymerization catalyst, process and polyolefin product  
A supported Ziegler catalyst prepared by reacting, under substantially anhydrous conditions, a refractory oxide support material having acidic surface hydroxyl groups, e.g. silica, and an organo...
4331558 Polymerization catalyst and process  
Alpha-olefins are polymerized employing a catalyst which forms on mixing a catalyst component A formed by milling together a magnesium halide or manganous halide with selected catalyst adjuvants...
4330651 Polymerization of α-olefins  
A catalyst for the solution polymerization of α-olefins is prepared by admixing component (A) with an organometal component (B), component (A) being prepared by reacting a specific...
4330646 Polymerization of an α-olefin  
A process for polymerizing an α-olefin comprising contacting the olefin in liquid phase at a temperature of about 120° to about 320° C. with a catalyst comprising a component (A) and an...
4328124 Olefin polymerization catalyst and process  
Olefin polymerization catalysts comprised of a supported adduct of a trialkyl-dialkylphosphato-titanate and chromium trioxide, processes for their preparation and polymerization processes employing...
4325835 Catalyst component  
A component for an olefin polymerization catalyst which is the product of treating a particulate support material with (a) an organo-magnesium compound, (b) an aluminium compound e.g. ethyl...
4324875 Method for producing olefin polymers  
A method for producing α-olefin polymers or copolymers by the use of an improved catalyst consisting of a combination of an organoaluminum compound with a specified solid product (III) which is...
4321159 Organo titanium chromium compound, catalyst prepared therefrom and polymerization of olefins therewith  
Dual transition metal compounds containing titanium and chromium are prepared by reacting a hydrocarbyloxy titanium halide with CrO 3 . The compounds are useful in catalysts for the polymerization...
4317897 Process for the production of extensively amorphous homo- and/or copolymers of α-olefins of 3 or more carbon atoms  
A process for the preparation of an extensively amorphous homo- or copolymer of an α-olefin of 3-32 carbon atoms comprises polymerizing an α-olefin using a titanium-containing Ziegler-Natta...
4313850 Catalyst for the polymerization of alpha-olefins  
Catalyst component comprising the reaction product of components comprising (1) at least one divalent metal halocarboxylate, (2) at least one oxygenated organic compound of a Group IVB or VB metal...
Matches 351 - 400 out of 527 < 1 2 3 4 5 6 7 8 9 10 11 >