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7566680 High surface area iron material prepared from a low surface area iron metal precursor  
A method for producing a high surface area iron material starting with a low surface area iron metal is disclosed. The iron material of the present invention has a surface area of at least about...
7271119 Process for preparing an olefin polymerization catalyst component  
Process for preparing an olefin polymerisation catalyst component in the form of particles having a predetermined size range, said process comprising the steps of a) preparing a solution of a...
7199077 Fischer-tropsch catalyst prepared with a high purity iron precursor  
A Fischer-Tropsch catalyst comprising iron and at least one promoter is prepared via a method which comprises the preparation of a high purity iron precursor and which uses a nominal amount of...
7057010 Process for the continuous drying of polymers containing N or amino, ammonium or spirobicyclic ammonium groups  
Process for the drying of polymers containing N or amino, ammonium or spirobicyclic ammonium groups, comprising cationic N-containing groups, and suitable counterions, in which the gelled and...
7008898 Method for producing a poly-1-olefin in the presence of a ziegler catalyst  
The invention relates to a method for producing a poly-1-olefin by polymerisation of a 1-olefin of the formula R 4 CH═CH 2 , in which R 4 is hydrogen or an alkyl radical having from 1 to 10...
6887817 Olefin polymerization catalyst and process for preparing polyolefins using said catalyst  
An olefin polymerization catalyst is described which includes: (A) a solid catalyst component being prepared by copulverizing a magnesium compound, an aluminum compound, an electron donor and a...
6649731 Catalysts for polyester production, process for producing polyester, and polyester  
By the present invention, there are provided a catalyst for polyester preparation, which comprises a solid titanium compound containing titanium, oxygen, carbon and hydrogen and having a Ti—O...
6639043 Azonaphthalene sulfonates as polymerization catalysts  
The present invention relates to a synthetic method comprising contacting at least one diaryl carbonate with one or more dihydroxy aromatic compounds in the presence of a transesterification...
6600011 Process for purification and drying of polymer hydrogels  
This invention relates to a method for purifying and drying a polymer hydrogel. This invention is based in part upon the discovery that rapid drying of polymer hydrogels can eliminate the problem...
6468936 Solid MAO/metallocene catalyst complex for propylene polymerization  
The catalyst is a mixture of metallocene catalyst component of the general formula: R″ b (CpR 4 )(CpR′ 4 )MR* v−2 where R″ is a bridge imparting stereorigidity to the structure to the...
6420304 Polymer-supported carbonylation catalyst and its use  
The invention relates to a polymer-supported carbonylation catalyst and its use in a process for preparing organic carboxylic acid or anhydride having n+1 carbon atoms. The invention relates also...
6417320 Catalyst and method for its production and use  
The production of linear polyester by the interchange of ester radicals or esterification and polycondensation of multivalent alcohols with multivalent carboxylic acids takes place by means of...
6403519 Process for the preparation of a catalyst for the polymerization of alpha-olefins, catalyst obtained and polymerization process using such a catalyst  
Process for the preparation of a catalyst for the polymerization of alpha-olefins involves contacting a porous polyolefin support with a solution containing an activator (ii) to form a suspension....
6384159 Production of polyethylene with a titanium amide catalyst  
The present invention relates to a process to produce polyethylene through homopolymerization or copolymerization of ethylene with alpha-olefins in the presence of a titanium amide catalyst...
6358381 Rhodium electrocatalyst and method of preparation  
The invention relates to a novel rhodium sulfide catalyst for the reduction of oxygen in industrial electrolyzers. The catalyst is highly resistant towards corrosion and poisoning by organic...
6300273 Catalysts for the (co)polymerization of ethylene  
The present invention relates to catalysts for the polymerization of ethylene and its mixtures with olefins CH 2 CHR VIII , comprising the reaction product of a solid catalyst component...
6153553 Process for the polymerization of alpha olefins using a new aluminophosphate support  
Novel catalysts are provided for the polymerization of olefins such as ethylene. These catalysts comprise a novel amorphous aluminophosphate comprising, on a microlevel, sheets of aluminophosphate...
6133188 Process for preparing an ethylene polymerization catalyst and ethylene polymerization process  
A preparation process for a catalytic support, based on a special alumina modified with varying quantities of magnesium chloride is described, a higher rate of MgCl 2 leading to a lesser quantity...
6114271 Process for the preparation of a polymerization and copolymerization of ethylene to give ultrahigh molecular-weight ethylene polymers  
Process for the preparation of a catalyst component for the polymerization and copolymerization of ethylene to give ultrahigh-molecular-weight ethylene polymers. Reaction of a Grignard compound...
6100351 Olefin polymerization process and products thereof  
Methods of producing polyolefin polymers by polymerizing an α-olefin in the presence of a catalyst including a pro-catalyst having a magnesium halide, an aluminum halide, a tetravalent titanium...
6068828 Zirconia powder, method for producing the same, and zirconia ceramics using the same  
A zirconia powder has an average particle diameter in a range from larger than 0.5 μm to 0.8 μm, and particles of 90 volume percent of the zirconia powder having a diameter of 1.5 μm or smaller....
5994256 Process for forming a catalyst precursor for copolymerizing ethylene and an alpha-olefin of 3 to 10 carbon atoms  
A process is described for forming a catalyst precursor, for copolymerizing ethylene and an alpha-olefin of 3 to 10 carbon atoms, by preparing a contact mixture of an inert solvent,...
5948720 Catalyst for the production of flexible polyolefin compositions, methods for making and using same, and products thereof  
A catalyst for use in the production of flexible polyolefins using a pro-catalyst of (a) a magnesium halide, (b) an aluminum halide, (c) a tetravalent titanium halide, (d) an electron donor...
5714424 Multi-component polyolefin catalysts  
The present invention encompasses a monolithic multi-component composite polyolefin catalyst particle comprising at least two distinct supported catalyst components wherein each catalyst component...
5648309 Process for the preparation of a poly-1-olefin  
A Ziegler catalyst in which the transition metal component has been prepared by reacting a transition metal compound of titanium, zirconium, vanadium or chromium with a gel-like dispersion of a...
5585447 Catalyst for the (co)polymerization of alpha-olefins, a process for its preparation and (co)polymerization process making use thereof  
This catalyst has the general formula VX 3 , mAIX 3 , nZ, wherein X is a halogen atom, Z is at least one at least partially halogenated, branched or unbranched, saturated hydrocarbon, m is between...
5484754 Process for treating a catalytic component, resultant component, and polymerization of ethylene using such component  
A process for the polymerization of ethylene or the copolymerization of ethylene with an alpha-olefin, in suspension or in gas phase, in the presence of a catalyst consisting essentially of a...
5409875 Polymer-supported catalyst for polymerization and copolymerization of olefins  
A polymer supported catalyst comprises Ziegler-Natta catalysts immobilized on a magnesium-modified polymer support. The catalyst support is prepared by (1) dissolving a carboxyl group-containing...
5135899 Method for the activation of a carrier for a polymerization catalyst, and a catalyst component obtained using the method  
The invention relates to the improving of a particle structure of carrier compounds for polymerization catalysts, and thereby to the improving of the activity of the entire catalyst, by jet...
5070056 Alkene polymerization process and catalyst compositions therefor  
Catalyst compositions enabling the production of polyalkenes with improved bulk density are prepared by combining the following catalyst components in the following order of addition: first...
4847227 Solid catalyst component for olefin polymerization catalysts  
A solid catalyst component for olefin polymerization catalysts prepared by suspending diethoxymagnesium (a) in an aromatic hydrocarbon (b) which is liquid at normal temperature and bringing the...
4724225 Solid catalyst component for α-olefin polymerization and process for the producing the same  
A solid catalyst component which can produce α-olefin polymers having a high stereoregularity and a good powder fluidity, stably and with a good efficiency in gas phase polymerization,...
4695558 Catalysts for homo- and copolymerization of ethylene and the polymers obtained by use thereof  
Disclosed are catalysts for the polymerization of ethylene and of mixtures thereof with olefins, comprising the product obtained by reacting the following components: (a) an Al-alkyl compound; ...
4680351 Supported polyolefin catalyst components and methods of making and using same  
A highly active catalyst suitable for the polymerization of olefins and its use are disclosed, said catalyst being prepared by (1) co-comminuting an aluminum halide; at least one electron donor;...
4675303 Mixed metal alkyl catalyst for olefin polymerization  
A catalyst composition for use in polymerizing alpha olefins which comprises (a) a solid supported titanium tetrahalide complex, wherein said complex is prepared by contacting a mechanically...
4670525 Catalytic titanium compound, process for the manufacture thereof, and method for the polymerization of alkenes-1 with application of such a titanium component  
The invention relates to a catalytic titanium component useful for the polymerization of alkenes-1 and for the copolymerization of alkenes-1 with each other or with ethylene, containing a...
4621124 Catalyst system for the polymerization of ethylene  
A catalyst system for use in the polymerization of ethylene under high pressure and temperature containing an alkyl-aluminum or alkylsiloxalane activator and a compound of the formula: (TiCla)...
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...
4617285 Catalyst components and catalysts for the polymerization of olefins  
Catalyst components for the polymerization of olefins and in particular of ethylene and of mixtures thereof with alpha-olefins comprising a tetravalent titanium halide supported on Ti trichloride...
4614727 Polymerization catalyst  
Polymerization catalysts, more particularly catalysts for the polymerization of ethylene and mixtures thereof with other monomers copolymerizable therewith, are disclosed. The catalysts are...
4613581 Catalyst component for polymerization of olefins P-998  
A solid titanium containing catalyst component for use in olefin polymerization said component prepared by contacting a magnesium alkoxide, a halogenated hydrocarbon, an electron donor and a...
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...
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...
4581426 Process for polymerization of α-olefins and catalysts therefor  
Stereospecific polymerization of α-olefins is carried out with use of a catalyst comprising an activated titanium component obtained by treating copulverized products of magnesium halide, an...
4563437 Process for preparation of catalytic components for polymerization of α-olefins  
A process for preparation of a component of a catalyst for polymerization of α-olefins is disclosed. The process comprises the steps of heating a titanium containing component during and/or after...
4560733 Polymerization and catalyst  
Polymerization of olefins in the presence of a catalyst system comprising titanium-coating component (A) associated with a milled blend of at least two different silica-containing components having...
4558023 Process for the preparation of an active solid hydrocarbon which can be used to polymerize olefines, and a process for the synthesis of an olefinic polymer or copolymer using the said active hydrocarbon as a catalytic system  
Process for the preparation of an active solid hydrocarbon which can be used to polymerize olefines. This process comprises forming a pulverulent composition by mixing a transition metal component,...
4552859 Olefin polymerization catalyst and process  
Isotactic index improvement is achieved for C 3 and higher alpha olefins in systems containing a catalyst component comprising titanium supported on a magnesium halide support. The titanium...
4546092 Process of preparing a solid catalytic titanium component and process for the polymerization of 1-alkenes using such a titanium component  
A process is disclosed for preparing a titanium catalyst component useful for homopolymerizing 1-alkenes and for copolymerizing 1-alkenes with each other and/or with ethylene, consisting...
4542197 Polymerization catalyst  
Polymerization catalysts, particularly catalysts for the polymerization of olefins, are disclosed. The catalysts are prepared by mixing hydrides of organometallic compounds of metals belonging to...
Matches 1 - 50 out of 175 1 2 3 4 >