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RE40140 Polymerization catalyst used for producing polyolefins that have excellent combined properties  
The invention relates to a process for preparing a catalyst for the polymerization of olefins, which comprises: a) preparation of a finely divided silica xerogel, b) loading of the xerogel...
7297320 Spherical carbons and method for preparing the same  
The present invention provides a method for preparing spherical carbon comprising step of heat-treating a mixture of a carbon precursor and dispersion media, a spherical non-graphitizable carbon...
7160830 Process for the preparation of catalyst microspheres  
The present invention relates to a process for the preparation of catalyst particles with a particle diameter in the range 20–2000 microns involving the steps of agitating at least two dry...
7065450 Process for production of new catalysts using an evolutionary process  
This invention relates to a process wherein improved production of catalysts is made possible according to an evolutionary method. The principles of mutation and crossing of catalyst components and...
6770731 Polycarbonate having pronounced shear thinning behavior  
A branched melt-polymerized polycarbonate having pronounced non-Newtonian flow behavior is disclosed. The polycarbonate is suitable for preparing molding compositions and the preparation of a...
6699959 Polycarbonate having a low shear thinning behavior  
A melt-polymerized polycarbonate is disclosed. The polycarbonate has a shear thinning ratio (y) that is defined by the limiting values of the following equation c+ax b >y>−c+ax b (Q)...
6465382 Process for producing spherical catalyst particles, catalyst particles and their use in a chemical synthesis  
Process for producing spherical catalyst particles containing a zeolite as active element, according to which a sol containing zeolite crystals and at least one gel-forming compound is sprayed from...
6388028 Components and catalysts for the polymerization of olefins  
The present invention relates to spherical solid catalyst components for the polymerization of olefins, comprising a titanium compound, supported on a magnesium halide, containing more than one...
6350422 Sorbent compositions  
A process for removing hydrogen sulfide from a fluid stream by contacting a hydrogen sulfide-containing stream with a sorbent composition wherein said sorbent composition is produced by mixing at...
6184177 Method of producing activated carbon particles from spent granular organic ion-exchange resin  
A method of processing spent ion-exchange resins contaminated with suspended particles, inorganic residues and/or organic foreign matter so as to render the resin ineffective for continued use, by...
6124226 Process for forming a catalyst, catalyst support or catalyst precursor with compressed fluids  
This invention relates to methods for spraying liquid compositions containing volatile solvent by using compressed fluids, such as carbon dioxide or ethane, to form solid particulates, coating...
6074983 Method for making spherical adsorbent particles  
The invention is directed to an unsintered spherical adsorbent particle composition having high mechanical strength and controlled pore size distribution, comprising finely divided silica hydrogel...
5962606 Control of solution catalyst droplet size with an effervescent spray nozzle  
The present invention teaches the use of an effervescent nozzle to deliver liquid catalyst to a gas phase polymerization system.
5935889 Catalyst and method of preparation  
Catalyst particles are prepared by coating a core particle, which is usually catalytically inert with respect to the intended chemical reaction, in a fluidized bed coating apparatus. The coating...
5905050 Method for preparing active carrier particles of equal size for a polymerization catalyst  
The active carrier particles of even size of the polymerization catalyst are prepared so that a melt of a complex composition is provided having the formula (I) MgCl 2 nROH mED ...
5879647 Method for the preparation of fine globular particles of yttrium oxide  
An improvement is proposed in the so-called urea method for the preparation of fine particles of yttrium oxide, according to which, while an aqueous reaction mixture containing a water-soluble...
5811362 Process for preparing a Ziegler-type spherical catalyst for alpha-olefin polymerization process  
A proces for preparing a spherical support for the polymerization of alpha-olefins from an ammonium dawsonite which is spray-dryed and formed into spherical particles which are then calcined and...
5674795 Spray dried, filled metallocene catalyst composition for use in polyolefin manufacture  
Metallocene-containing catalyst compositions that include inert filler, a method for their preparation, and a method for their use in production of polyolefins are disclosed and claimed. The...
5618770 Process for the production of powder catalysts  
Magnesium chloride, titanium chloride and at least an electron donor are introduced in a plasma torch. These chlorides being in solution or in suspension in a liquid that can be an electron donor....
5521133 Phosphorus bound porous microspheres  
This invention relates to microspheres produced by spray drying clay slurries and calcining the product to form attrition resistant microspheres. Phosphoric acid is injected in a neutral to mildly...
5500396 Process to make small, discrete, spherical adducts  
A process to make a small, discrete, spherical magnesium dihalide alcohol adduct is provided. This process comprises: contacting a magnesium dihalide and an alcohol in a high-viscosity liquid that...
5468698 Method for the preparation of a particulate carrier for a polymerization catalyst  
The invention relates to a method for preparing a particulate carrier for an olefin polymerization procatalyst comprising a complex of an organic compound/transition metal compound as a carrier. In...
5468558 Process for preparing fracture-resistant sol/gel particles  
A process for preparing fracture-resistant sol/gel particles which contain silicon dioxide, in which a highly disperse filler is added to the aqueous alkali metal silicate solution and/or the...
5382557 Procedure for the preparation of a solid component of catalyst for the (co)polymerization of ethylene  
A solid component of catalyst highly active in the (co)polymerization of ethylene containing titanium, magnesium, aluminum, chlorine and alkoxy groups, and obtained by means of a procedure wherein:...
5322830 Method for the preparation of catalyst components for the polymerization of ethylene with a relatively narrow molecular weight distribution and protocatalyst composition  
The invention relates to a method for the preparation of a supported procatalyst intended for the polymerization of olefins, in which particles are formed from magnesium halide and alcohol, the...
5310712 Process for the preparation of a supported catalyst for the polymerization of α-olefins  
In a novel process for the preparation of a supported catalyst for the polymerization of α-olefins, a carrier gel (1) is first prepared by a method in which a sodium or potassium waterglass...
5254516 Fluidizable zinc titanate materials with high chemical reactivity and attrition resistance  
Highly durable and chemically reactive zinc titanate materials are prepared in a particle size range of 50 to 400 μm suitable for a fluidized-bed reactor for removing reduced sulfur species in a...
5232883 Process for obtaining monodisperse microspheroidal particles, microspheroidal silica particles of high specific surface, and catalysts supported on these particles  
Process for obtaining monodisperse microspheroidal particles, comprising spraying an electrostatically charged gellable liquid material through a spraying orifice and into a chamber, so as to...
5225123 Methods for producing hollow microspheres made from dispersed particle compositions  
Method for making hollow microspheres of substantially uniform diameter and of substantially uniform wall thickness is disclosed. The walls of the hollow microspheres comprise sintered together...
5215949 Method and equipment for the preparation of a carrier of a polymerization catalyst  
In conventional spraying methods the problem in the preparation of small carrier particles aimed for the polymerization is that the drops constituting the prestages of the particles agglomerate or...
5204303 Preparation and use of a new ziegler-natta catayst component  
The invention relates to a method for the preparation of a supported procatalyst intended for the polymerization of olefines, in which particles are formed of magnesium dihalide and alcohol, the...
5168084 Molecular sieve agglomerates with improved transport properties  
Molecular sieve agglomerates exhibiting reduced pore mouth blockage and decreased diffusivity resistance to the internal sieve pores result from coating, prior to addition of a binding agent to the...
5153160 Method for preparing microparticles of a thermoplastic resin containing an encapsulated hydrosilylation reaction catalyst  
Microparticles of a hydrosilylation catalyst encapsulated in a thermoplastic resin are prepared by forming a solution containing the hydrosilylation catalyst and a thermoplastic resin with a...
5145578 Packing material for liquid chromatography  
A packing material for liquid chromatography, comprising a spherical clay mineral powder which comprises a naturally occurring or synthetic water-swellable clay mineral, a clay mineral having...
5100849 Process for producing a catalyst for olefin polymerization  
A process for producing a catalyst component for olefin polymerization is provided, which process comprises spraying a solution of a magnesium compound e.g. MgCl 2 and an alcohol such as MgCl 2 ....
5070160 Process for drying aluminoxane and process for producing polymers  
Disclosed is a process for drying aluminoxane, which comprises drying a viscous solution containing aluminoxane, while applying a shearing force sufficient to keep said viscous solution in...
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...
5070051 Catalyst component and catalyst for the production of very high molecular weight polyolefins  
A solid catalyst component for the low-pressure polymerization of ethylene and C 3 -C 10 alpha-olefins into very high molecular weight polyolefins is in the form of a spherical granular solid...
5034361 Catalyst precursor production  
Normally sparingly soluble magnesium alkoxide is solubilized in alkanol by the additional presence of certain acidic materials. The resulting solution is used to produce a mixture of substantially...
5006499 Ziegler-natta catalyst and a process for its preparation  
A process for the preparation of a solid catalyst of the Ziegler-Natta type comprises precipitating the solid catalyst in a liquid hydrocarbon medium by reacting (A) a solution of a soluble...
4994422 Microspheres coated with catalyst and methods of producing same  
Means and methods of producing catalytically coated microspheres of hydrocarbon fuel in a tower into which precharged free floating initially frozen globules of hydrocarbon fuel are drawn through a...
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...
4948773 Amphora particulate catalyst-support and a method for the preparation of an amphora-type particulate catalyst-support  
An amphora-type particulate catalyst-support having an adequately small average particle size and a low attrition index and a method for preparing an amphora-type particulate catalyst-support are...
4923833 Catalyst for olefin polymerization and processes for its production  
The solid catalyst of this invention for olefin polymerization comprises a compound of a transition metal of Group IV of the periodic table and an aluminoxane as catalyst ingredients. The catalyst...
4894189 Process for the production of spherical particles  
A method for making spherical particles, which includes: (a) kneading powdered raw material, preferably a refractory inorganic material, liquid and wax to form a dough/agglomerated granules, ...
4876231 Process for preparing crystalline malachite  
An improved three stage process for preparing agglomerates of spheroidal masses of malachite crystals in which the formation of pH gradients during addition of ingredients to the third stage is...
4871489 Spherical particles having narrow size distribution made by ultrasonic vibration  
An apparatus and process for producing liquid droplets having a narrow size distribution. Thin liquid streams are forced under pressure through a plurality of orifices in an orifice plate, the...
4851208 Process for the manufacture of spherical particles of metal compounds of group II of the periodic table  
A process for the manufacture of substantially spherical particles of at least one metal compound of Group II of the Periodic Table, comprising dissolving such compound in a solvent therefor to...
4843049 Catalyst component for polymerizing ethylene or copolymerizing ethylene with an alpha-olefin  
A catalyst component is in the form of a granular spherical solid with at least 80% of the granules between 30 and 40 microns in size, a service area of 15 to 30 m 2 /g and a porosity of 40 to 80...
4829034 Procedure for manufacturing catalyst components for polymerizing olefines  
The invention concerns a procedure for manufacturing solid catalyst components for catalysts serving polymerization of alpha-olefines, having a solid carrier substance containing an organic or...
Matches 1 - 50 out of 132 1 2 3 >