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| Number | Title | Issue Date |
| 8173755 | Ultra high molecular weight ethylene copolymer powder The present invention relates to an ultrahigh-molecular-weight ethylene copolymer powder having an intrinsic viscosity (η) of 10 dl/g to 34 dl/g, obtainable by copolymerizing ethylene and at least one olefin selected from the group consisting of α-olefins having 3... | 05/08/2012 |
| 7884163 | Silica-coated alumina activator-supports for metallocene catalyst compositions Silica-coated alumina activator-supports, and catalyst compositions containing these activator-supports, are disclosed. Methods also are provided for preparing silica-coated alumina activator-supports, for preparing catalyst compositions, and for using the catalyst ... | 02/08/2011 |
| 7435370 | Process of making a fiber A fiber and a process for obtaining same from a high-modulus polyethylene, extrudable in state-of-the-art equipment and in the absence of previous solubilization in any kind of organic solvent is described, the process comprising providing such a polyethylene, intro... | 10/14/2008 |
| 7405176 | Solid main catalyst component for ethylene polymerization, a process for preparing the same and a catalyst containing the same The present invention provides a high-activity solid main catalyst component for ethylene polymerization, a process for preparing the same and a catalyst containing the same. The main catalyst component consists essentially of a magnesium compound, a titanium compou... | 07/29/2008 |
| 7354981 | Polyethylene catalyst and a process for preparing the same The present invention discloses a polyethylene catalyst and a process for preparing the same, said catalyst being composed of a main component of catalyst and a cocatalyst, wherein the main component of catalyst is prepared by reacting: (1) a magnesium-alcohol compl... | 04/08/2008 |
| 7326760 | Production of broad molecular weight polyethylene Broad molecular weight polyethylene and polyethylene having a bimodal molecular weight profile can be produced with chromium oxide based catalyst systems employing alkyl silanols. The systems may also contain various organoaluminum compounds. Catalyst activity and m... | 02/05/2008 |
| 7300902 | Catalyst for polymerization of ethylene, preparation thereof and use of the same The present invention provides an ethylene polymerization catalyst. The present invention also provides a process for preparing the ethylene polymerization catalyst, comprising reacting powdered magnesium with an alkyl halide of formula RX in the presence of an ethe... | 11/27/2007 |
| 7291577 | Hydrometallurgical process for production of supported catalysts A process for the production of a supported catalyst. The process comprises heating a slurry that comprises a catalyst support and at least one active catalytic ingredient precursor. Gas is introduced to the slurry at a sufficient pressure to reduce the at least one... | 11/06/2007 |
| 7282546 | Cocatalysts for reduction of production problems in metallocene-catalyzed polymerizations Polyolefins may be prepared using a cocatalyst conforming to the formula: AIRz(Xz)nLzm wherein Rz is a linear or branched organic moiety having at least 5 carbons and Xz | 10/16/2007 |
| 7256150 | Preparation of olefin polymerization catalyst component A process for producing a Gp 2/transition metal olefin polymerisation catalyst component, in which a Gp 2 complex is reacted with a transition metal compound so as to produce an oil-in-oil emulsion, the disperse phase containing the preponderance of the Gp 2 metal b... | 08/14/2007 |
| 7244794 | Method for producing propylene polymer having a very high melt-flowability The present invention relates to a method for producing a propylene polymer having a very high melt flowability, specifically to a method for producing an isotactic propylene polymer having a dramatically improved melt flowability with a relatively high production y... | 07/17/2007 |
| 7211535 | Enhanced polyolefin catalyst The present invention provides a novel process for preparing a catalyst useful in gas phase polymerization of olefins wherein the physical properties of the polymer and the productivity of the catalyst can be altered depending on the sequence of addition of the cata... | 05/01/2007 |
| 7141634 | Catalyst for olefin polymerization and process for polymerizing olefins A catalyst for olefin polymerization comprising (A) a solid catalyst component which is prepared by causing (a) a magnesium compound, (b) a tetravalent titanium halide compound, and (c) an electron donor compound to come in contact with each other, (B) an organoalum... | 11/28/2006 |
| 7135531 | Spherical catalyst for olefin polymerization Disclosed are catalyst systems and methods of making the catalyst systems/supports for the polymerization of an olefin containing a solid titanium catalyst component having a substantially spherical shape and containing an internal electron donor, a support made fro... | 11/14/2006 |
| 7022795 | Highly crystalline propylene homopolymers Propylene homopolymers, wherein, in their separation according to tacticity by first dissolving the polymers in boiling xylene, then cooling the solution to 25° C. at a cooling rate of 10° C./h and then, with ascending temperature, separating the propylene homopol... | 04/04/2006 |
| 7001862 | Catalyst composition for polymerization of olefins and method for preparing the same The present invention relates to a catalyst composition for polymerization of olefins comprising: (a) a solid catalyst pre cursor comprising at least one vanadium compound, at least one magnesium compound and a polymeric material or a solid catalyst precursor compri... | 02/21/2006 |
| 6884746 | Catalysts for olefin polymerization and method of olefin polymerization using the same Described herein is a prepolymerized catalyst encapsulated with macromolecular monomers which is prepared by adding olefin mononers and diene compounds to a solid complex titanium catalyst for olefin polymerization and then polymerizing, and also relates to a method... | 04/26/2005 |
| 6861385 | Process for the preparation of a spherical support comprising a Mg dihalide A process for preparing spherical support particles used in the preparation of catalytic components for the polymerization of olefins by (a) forming an emulsion of an adduct of a Mg dihalide and a Lewis base compound in a liquid medium, and (b) cooling the emulsion ... | 03/01/2005 |
| 6841498 | Catalyst system for ethylene (co)polymerization Disclosed is a new titanium based catalyst system for (co)-polymerizing ethylene or ethylene with alpha-olefin having 3 to 10 carbons. The catalyst is obtained by contacting a magnesium halide support with an aluminum compound and with a titanium halide compound and... | 01/11/2005 |
| 6703455 | Catalyst component comprising magnesium, titanium, a halogen and an electron donor, its preparation and use A process for the preparation of an olefin polymerization catalyst component containing a magnesium dihalide, a titanium tetrahalide, and a dicarboxylic acid di- oligo- or polyester as internal electron donors is disclosed. A catalyst component and its us... | 03/09/2004 |
| 6686433 | Dual donor catalyst system for the polymerization of olefins The present invention provides a catalyst system that exhibits unexpected control of desired properties in polyolefin products. The catalyst system includes a titanium-supported catalyst in combination with a mixture of tetraethoxysilane (TEOS) and dicycl... | 02/03/2004 |
| 6664208 | Modified aluminum oxy compound, polymerization catalyst and process for producing olefin polymer and alkenyl aromatic hydrocarbon polymer A modified aluminum oxy compound(A) obtained by reacting an aluminum oxy compound(a), water (b) and a compound having a hydroxyl group(c); a polymerization catalyst component comprising the modified aluminum oxy compound; a polymerization catalyst obtaine... | 12/16/2003 |
| 6569964 | Alumoxane-enhanced, supported Ziegler-Natta catalysts, methods of making same, processes of using same and polymers produced therefrom The invention relates to an improved olefin catalyst, a method of in situ-activated catalyst preparation and a process for the polymerization of olefinic monomers via, for example, a titanium trichloride/magnesium dichloride/tetrahydrofuran reaction produ... | 05/27/2003 |
| 6544920 | Components and catalysts for the polymerization of olefins Solid catalyst component for the polymerization of olefins, includes the product of the direct reaction, with no subsequent reactions with reducing organometallic compounds, between a titanium compound and a support obtained by contacting a metal oxide co... | 04/08/2003 |
| 6486089 | Bimetallic catalyst for ethylene polymerization reactions with uniform component distribution The invention relates to a process for uniformly dispersing a transition metal metallocene complex on a carrier comprising (1) providing silica which is porous and has a particle size of 1 to 250 microns, having pores which have an average diameter of 50 to 50... | 11/26/2002 |
| 6433108 | Catalytic component and its use in olefin polymerization The invention relates to a process for the manufacture of a solid catalytic component for the polymerization or copolymerization of olefins, resulting in a polymer or copolymer with broadened molecular mass distribution. The process includes a first stage... | 08/13/2002 |
| 6410475 | Catalyst intended for the polymerization of olefins, process for its manufacture and use The olefin polymerization catalyst comprises a supported transition metal, magnesium and halogen; the support comprises aluminum phosphate and at least one oxide of silica or alumina. The catalyst is formed by impregnating the support with a liquid comple... | 06/25/2002 |
| 6339036 | Low aluminum and magnesium Z-N solution catalysts The present invention provides a Ziegler-Natta catalyst useful in solution processes for the polymerization of olefins having a low amount of aluminum and magnesium. The catalysts of the present invention have a molar ratio of magnesium to the first alumi... | 01/15/2002 |
| 6333388 | Aluminum compound-containing solid catalyst component, catalyst for olefin polymerization and method for producing olefin polymer Described are an aluminum compound-containing solid catalyst component obtained by bringing a carrier into contact with an organoaluminumoxy compound, followed by bringing this product into contact with a compound having an electron attractive group; a tr... | 12/25/2001 |
| 6313227 | Propylene-ethylene block copolymer, resin composition, and blow-molded article Provided are a propylene-ethylene block copolymer having MFR of from 0.01 to 1.0 g/10 min and comprised of (A) from 85 to 97% by weight a 25° C. xylene-insoluble fraction and (B) from 3 to 15% by weight of a 25° C. xylene-soluble fraction, wherein the f... | 11/06/2001 |
| 6313225 | Catalyst for olefin (co-)polymerization and method for producing the same Disclosed is a catalyst for olefin (co-)polymerization comprising a transition metal compound catalytic component which contains at least a titanium compound and an -olefin (co-)polymer (A) supported by the catalyst, wherein said -olefin (co... | 11/06/2001 |
| 6303715 | Method for polymerization and copolymerization of alpha-olefin The present invention relates to a method of polymerization or co-polymerization of olefin under the catalyst system which comprises (a) a solid complex titanium catalyst comprising of a magnesium compound, a titanium compound, and an internal electron do... | 10/16/2001 |
| 6300434 | Propylene-ethylene copolymers made from three different constituents Propylene-ethylene copolymers obtainable by three-step polymerization from the gas phase in an agitated fixed bed by means of a Ziegler-Natta catalyst system which, in addition to a titanium-containing solid component, also contains, as cocatalyst, an alu... | 10/09/2001 |
| 6291384 | High activity catalyst prepared with alkoxysilanes An ethylene-alpha-olefin copolymerization catalyst is prepared by impregnating a silica calcined at elevated temperature sequentially with an organomagnesium compound such as dialkylmagnesium compound, a silane compound which is free of hydroxyl groups, s... | 09/18/2001 |
| 6288180 | Process for the polymerization of .alpha.-olefins, a catalyst used in the polymerization and its preparation In the polymerization of C.sub.3 -C.sub.12 -.alpha.-olefins, the activity of the catalyst and the isotacticity and molecular weight of the polymer product can be adjusted and improved in a controlled manner by a new process wherein A) a catalyst system is... | 09/11/2001 |
| 6225420 | Procatalyst and process for the preparation of a multimodal ethylene polymer A procatalyst and a process for the preparation of a multimodal ethylene homopolymer or copolymer by gas-phase polymerisation is described. The procatalyst used in the process is prepared by: a) contacting the support, preferably silica with a halogenating age... | 05/01/2001 |
| 6221974 | Process for the preparation of creep-resistant polypropylene block copolymers The invention relates to a process for the preparation of a creep-resistant polypropylene by means of the following steps: (a) copolymerizing propylene and ethylene into a random copolymer at 40 to 110° C. using: a catalyst system of the above-mentioned ... | 04/24/2001 |
| 6130300 | Low aluminum and magnesium Z-N solution catalysts The present invention provides a Ziegler-Natta catalyst useful in solution processes for the polymerization of olefins having a low amount of aluminum and magnesium. The catalysts of the present invention have a molar ratio of magnesium to the first alumi... | 10/10/2000 |
| 6111039 | Dual donor catalyst system for the polymerization of olefin The present invention provides a catalyst system that exhibits unexpected control of desired properties in polyolefin products. The catalyst system includes a titanium-supported catalyst in combination with a mixture of tetraethoxysilane (TEOS) and dicycl... | 08/29/2000 |
| 6100353 | Supported metallocene catalyst systems Supported catalyst systems are obtainable by a) application of a mixture of A) at least one metallocene complex and B) at elast one metal compound to a carrier which, if required, may have been pretreated, and b) subsequent activation by reaction with a solution or susp... | 08/08/2000 |
