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| Number | Title | Issue Date |
| 7151146 | Neodymium-carbon nanotube and method of preparing high 1,4-cis-polybutadiene using the same The present invention relates to a method for preparing neodymium-carbon-nanotube and a process for preparing 1,4-cis-polybutadiene utilizing the same and more particularly, neodymium-carbon-nanotube. Neodymium is introduced by coordination with carboxylic acid, whi... | 12/19/2006 |
| 6855656 | Polymerization and propylene block copolymer A propylene block copolymer with a high proportion of ethylene-propylene copolymer particles (rubber component) well dispersed in a propylene polymer exhibiting well-balanced rigidity and impact resistance can be obtained by using a solid catalyst for polymerization... | 02/15/2005 |
| 6797794 | Olefins produced from pre-polymerized catalyst component catalysts Olefin polymers produced using components of catalysts obtained by contacting a Ti compound of formula Ti(OR)n-yXy, where n is the valence of titanium and y is a number between 1 and n, with a pre-polymer having a porosity higher than 0.3 cc/g ... | 09/28/2004 |
| 6710144 | Process for producing olefin polymer There is provided a process for producing an olefin polymer, which comprises a step of polymerizing an olefin in a gas phase in the presence of a homogeneous solid catalyst having a content of particles having a particle size of not more than 180 μm of not more tha... | 03/23/2004 |
| 6645901 | Prepolymerization catalyst for use in gas phase polymerization of olefins and process for producing the same A prepolymerization catalyst for use in a gas phase polymerization of an olefin or combinations of olefins which comprises (A) a solid catalyst component comprising magnesium, halogen, titanium and an electron donor and having a weight-average particle di... | 11/11/2003 |
| 6632897 | Use of nano-scaled metal oxide particles as polymerization catalysts Described is the use of nanoscale metal oxide particles as catalysts for the thermal and/or photochemical polymerization of species having at least one polymerizable carbon-carbon multiple bond and/or at least one carbon containing ring capable of undergo... | 10/14/2003 |
| 6627707 | Olefin polymerization processes and products thereof A novel loop/slurry olefin polymerization process is provided which produces ultra-high molecular weight ethylene homopolymer.... | 09/30/2003 |
| 6524986 | Catalyst support and catalyst for the polymerization of -olefins Catalyst support containing an -olefin polymer which is in the form of particles of mean size from 5 to 350 μm in which the pore volume generated by the pores of radius from 1,000 to 75,000 Å is at least 0.2 cm3 /g. Catalyst usable for... | 02/25/2003 |
| 6451726 | Pre-polymerized catalyst components for the polymerization of olefins Components of catalysts for the polymerization of olefins are obtained by contacting a Ti compound of formula Ti(OR)n-y Xy, where n is the valence of titanium and y is a number between 1 and n, with a pre-polymer having a porosity hi... | 09/17/2002 |
| 6395667 | Solid catalyst component for -olefin polymerization and process for producing -olefin polymer The present invention relates to a solid catalyst component for -olefin polymerization having a narrow particle size distribution of not less than 6.0 in terms of the value of N in a Rosin-Rammler function of particle size distribution and giving a... | 05/28/2002 |
| 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 supported by an organic polymer material, for the production of m... | 05/07/2002 |
| 6294494 | Olefin polymerization processes and products thereof A novel loop/slurry olefin polymerization process is provided which produces ultra-high molecular weight ethylene homopolymer.... | 09/25/2001 |
| 6187883 | Solid catalyst component for -olefin polymerization, catalyst for -olefin polymerization, and process for producing -olefin polymer The present invention relates to a solid catalyst component for -olefin polymerization having a narrow particle size distribution of not less than 6.0 in terms of the value of N in a Rosin-Rammler function of particle size distribution and giving a... | 02/13/2001 |
| 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 with a halogenating agent, a titanium compound, a perhalogen ... | 09/05/2000 |
| 5863854 | Catalyst system for olefin polymerization and process for the polymerization of at least one olefin in the presence of this catalyst system A catalyst system for olefin polymerization, including a catalytic solid based on chromium deposited on a support containing silica, alumina and aluminium phosphate and a cocatalyst chosen from organoaluminium compounds. One of the essential characteristi... | 01/26/1999 |
| 5770744 | Process for the preparation of succinic anhydride Maleic anhydride can be hydrogenated with hydrogen to give succinic anhydride by a catalyzed liquid-phase hydrogenation, by carrying out the hydrogenation continuously at a pressure of 50 to 400 bar and a reaction temperature of 60° to 180° C. on oxygen... | 06/23/1998 |
| 5726260 | Process for the production of a microspheroidal powder of low dispersity, microspheroidal powder of low dispersity thus obtained, catalysts for the polymerization of alpha-olefins and process for the polymerization of alpha-olefins Process for the production of a microspheroidal powder of low dispersity, according to which a hydrogel is prepared, an aqueous suspension of the ground hydrogel is subjected to atomisation in a stream of gas, gelled particles containing moisture are coll... | 03/10/1998 |
| 5652314 | Shape-shifted magnesium alkoxide component for polymerizing olefins A process is provided for preparing a shape-shifted catalyst component comprising (1) contacting a dihydrocarbyloxide magnesium compound with carbon dioxide in the presence of a slurrying agent to form a slurry of a carboxylated dihydrocarbyloxide magnesi... | 07/29/1997 |
| 5641842 | Ethylene copolymerization process A process is provided comprising copolymerizing, under copolymerizing conditions, ethylene with one or more alpha-olefins, using a catalyst system, where said catalyst system has been sized, to produce a lower-density-copolymer, where said lower-density-c... | 06/24/1997 |
| 5604172 | Shape-shifted magnesium alkoxide component for polymerizing olefins A process is provided for preparing a shape-shifted catalyst component comprising (1) contacting a dihydrocarbyloxide magnesium compound with carbon dioxide in the presence of a slurrying agent to form a slurry of a carboxylated dihydrocarbyloxide magnesi... | 02/18/1997 |
| 5567665 | Shape-shifted magnesium alkoxide component for polymerizing olefins A process is provided for preparing a shape-shifted catalyst component comprising (1) contacting a dihydrocarbyloxide magnesium compound with carbon dioxide in the presence of a slurrying agent to form a slurry of a carboxylated dihydrocarbyloxide magnesi... | 10/22/1996 |
| 5432236 | Process for preparing polyolefins According to the present invention, in a vapor phase polymerization of olefins, there is provided an efficient polyolefin manufacturing process capable of preventing the formation of a sheet-like polymer and allowing an olefin polymerization reaction to b... | 07/11/1995 |
| 5349033 | Process for the preparation of polyolefin It is possible to obtain globular polymers in the polymerization of alpha-olefins by means of a highly active, spherical Ziegler catalyst. The polymers have a high bulk density and can be processed very easily.... | 09/20/1994 |
| 5264506 | Process for producing sticky polymers A process for producing sticky polymers at polymerization reaction temperatures in excess of the softening temperatures of the sticky polymers in a fluidized bed reactor in the presence of an inert particulate material which comprises utilizing as a suppo... | 11/23/1993 |
| 5213895 | Particle-bearing composite and a method for producing the same Disclosed is a particle-bearing composite comprising a solid carrier and polymer-protected particles adsorbed thereon, wherein the polymer has a number average molecular weight of 3,000 to 300,000 and the particles are of a metal and/or a metal compound. ... | 05/25/1993 |
| 5208109 | Process for the polymerization and copolymerization of alpha-olefins in a fluidized bed The present invention relates to a process for polymerizing or copolymerizing alpha-olefins comprising, on the one hand, a prepolymerization stage by contacting one or more alpha-olefins with a Ziegler catalyst system consisting of a solid catalyst contai... | 05/04/1993 |
| 5206198 | Catalytic solid usable for the stereospecific polymerization of alpha-olefins, process for preparing it and process for polymerizing alpha-olefins in its presence Catalytic solids based on titanium trichloride complex, usable for the stereospecific polymerization of alpha-olefins, obtained by heat treatment, in the presence of a halogenated activating agent, of the liquid material resulting from bringing TiCl4... | 04/27/1993 |
| 5087522 | Process for the polymerization and copolymerization of alpha-olefins in a fluidized bed The present invention relates to a process for polymerizing or copolymerizing alpha-olefins comprising, on the one hand, a prepolymerization stage by contacting one or more alpha-olefins with a Ziegler catalyst system consisting of a solid catalyst contai... | 02/11/1992 |
| 5063110 | Composition comprising prepolymer powder and pulverulent inorganic material A process for (co)polymerizing alpha-olefins in the gas phase in a fluidized bed or mechanically stirred bed reactor using a Ziegler-Natta type catalyst or a heat activated chromium oxide/refractory oxide catalyst wherein the (co)polymerization is carried... | 11/05/1991 |
| 5051484 | Process for producing granular thermoplastic elastomer and granular elastomer A solid catalyst component for -olefin polymerization containing as catalyst components at least titanium, magnesium and chlorine which are impregnated into an organic porous polymer carrier having a mean particle diameter of 5 to 1,000 μm and a p... | 09/24/1991 |
| 4972035 | Process for preparing ultra-high-molecular-weight polyolefin fine powder Ultra-high-molecular-weight polyolefin fine powder characterized in that said fine powder has an intrinsic viscosity measured in decalin at 135° C. of at least 10 dl/g and an average particle diameter in the range of 1-80 μm, at least 20 weight % of the... | 11/20/1990 |
| 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 50, an average particle size being 5 to 200 μm and ... | 08/28/1990 |
| 4946914 | Modified chromium-containing catalyst composition polymerization process with alpha-olefins A modified supported catalyst for polymerizing alpha-olefins, for example, ethylene, is prepared by combining a chromium compound-containing catalyst with a modifier which is an oxide of an element of Group II A of the Periodic Chart of the Elements. The ... | 08/07/1990 |
| 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 radius in a range of from 200 to 2,000 Å, is 0.3 cc/g or... | 07/10/1990 |
| 4910271 | Process for the polymerisation of ethylene or the copolymerisation of ethylene and alpha-olefins in a fluidised bed in the presence of a chromium based catalyst The present invention relates to a process for the polymerisation of ethylene or copolymerisation of ethylene and at least one other alpha-olefin, in the gas phase in a fluidised bed reactor, in the presence of a catalyst comprising chromium compounds ass... | 03/20/1990 |
| 4894424 | Polymerisation of olefins using modified ziegler-natta catalyst The present invention relates to a process for the polymerisation or copolymerisation of alpha-olefins in the presence of a Ziegler-Natta catalyst system comprising on the one hand a catalyst solid comprising compounds of halogens, transition metals of Gr... | 01/16/1990 |
| 4845176 | Preparation of homopolymers and copolymers of ethene using a chromium trioxide catalyst Ethene homopolymers and ethene copolymers with minor amounts of higher -monoolefins are prepared by polymerization of the monomer or monomers using a chromium trioxide catalyst which is obtained by a method in which (1) a finely divided, porous, si... | 07/04/1989 |
| 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 inorganic magnesium compound and treated with a titanium halid... | 05/09/1989 |
| 4725225 | Portable chemical heater A portable chemical heater for cooking or warming food, the heater including a can filled with diethylene glycol fluid. The can is provided at its top with a protruding neck that is normally closed by a removable cap. Seated within the neck is a cup-shape... | 02/16/1988 |
| 4724225 | Solid catalyst component for -olefin polymerization and process for the producing the same A solid catalyst component which can produce -olefin polymers having a high stereoregularity and a good powder fluidity, stably and with a good efficiency in gas phase polymerization, particularly in gas phase copolymerization, a catalyst for ... | 02/09/1988 |
