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| Number | Title | Issue Date |
| 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 |
| 7214642 | Methods of preparing active chromium/alumina catalysts via treatment with sulfate Methods of preparing a polymerization catalyst are provided that include contacting a support comprising alumina with a sulfating agent and with chromium. In an embodiment in which the chromium is provided from a chromium compound such as chromium oxide, the support... | 05/08/2007 |
| 7205364 | Olefin polymerization catalysts The invention is a catalyst system including a Group IV B transition metal component and an alumoxane component which may be employed to polymerize olefins to produce a high molecular weight polymer. ... | 04/17/2007 |
| 7202316 | Modified particle, catalyst component for addition polymerization, catalyst for addition polymerization and process for producing addition polymer A modified particle obtained by a process containing contacting a Bi compound, a compound having an electron-withdrawing group and an active hydrogen and particle; and a catalyst component for addition polymerization containing the modified particle; a catalyst for ... | 04/10/2007 |
| 7160833 | Spray-dried polymerization catalyst and polymerization process employing same A spray-dried composition comprising the reaction product of a magnesium halide, a solvent, an electron donor compound, and a transition metal compound and an inert filler comprising substantially spherical particles having an average particle size ranging from abou... | 01/09/2007 |
| 7112643 | Polymers having low levels of long chain branching and methods of making the same Methods of producing a polymer include contacting at least one olefin with a catalyst prepared by contacting a support comprising alumina with a sulfating agent and with chromium. Polymer compositions produced in this manner may exhibit relatively low levels of long... | 09/26/2006 |
| 7009013 | Process for producing crystalline 1,2-polybutadiene 1,3-Butadiene is polymerized in a hydrocarbon solvent using a catalyst system containing (A) a cobalt salt, (B1) a phosphine compound having one branched aliphatic group of 3 or more carbon atoms or one alicyclic group of 5 or more carbon atoms and two aromatic grou... | 03/07/2006 |
| 6998450 | Method for preparing a homo-and co-polymers by polymerization of cyclic olefin compounds using fluorine-containing aromatic hydrocarbon compound as catalyst activator The present invention provides a method for preparing homo- and co-polymers by polymerizing cyclic olefin compounds using addition polymerization. The method can produce a cyclic olefin polymer having a high molecular weight with a high yield in the presence of, as ... | 02/14/2006 |
| 6906154 | Catalyst for the polymerization of olefins The present invention relates to catalyst components for the polymerization of olefins comprising a titanium compound, having at least a Ti-halogen bond, and at least two electron donor compounds supported on a Mg dihalide, said catalyst component being characterize... | 06/14/2005 |
| 6887956 | Catalyst system for high-cis polybutadiene A catalyst system suitable for use in the production of high cis polybutadiene is disclosed. The catalyst system includes a cobalt salt of the formulaCoAx?, where A is a monovalent or divalent anion and x is 1 or 2; an alkyl aluminum chloride compound of ... | 05/03/2005 |
| 6849700 | Catalyst component comprising magnesium, titanium, a halogen and an electron donor, its preparation and use The invention relates to a process for the preparation of an olefin polymerisation catalyst component, said catalyst component and its use. The process is mainly characterized by the steps of (i) reacting in solution a magnesium co... | 02/01/2005 |
| 6806221 | Method for preparing a spray-dried composition for use as a polymerization catalyst A method of making a spray-dried composition using a solution or mixture comprising the reaction product of a magnesium halide, a solvent, an electron donor compound, and a transition metal compound and an inert filler comprising substantially spherical particles ha... | 10/19/2004 |
| 6723808 | Catalyst system and its use in a polymerization process Disclosed are polymerization catalyst activator compositions which include a carbonium cation and an aluminum containing anion. These activator compositions are prepared by combining a carbonium or trityl source and with an aluminum containing complex, preferably a ... | 04/20/2004 |
| 6716947 | Method for preparing dimethyl dipropargylmalonate polymer containing six-membered ring structure Disclosed is a method for preparing dimethyl dipropargylmalonate polymer containing exclusively six-membered ring structure by using supercritical or sub-critical carbon dioxide as a solvent with a transition metal chloride catalyst. ... | 04/06/2004 |
| 6639028 | Process for the continuous gas-phase (co-)polymerization of olefins in a fluidized bed reactor A process for the gas-phase (co-)polymerization of olefins in a fluidized bed reactor using a chromium oxide catalyst. The polymerization is performed in the presence of a process aid additive.... | 10/28/2003 |
| 6608152 | Process for the polymerization of olefins; novel polyethylenes, and films and articles produced therefrom A novel process for the polymerization of olefins is provided. The process involves contacting at least one olefin with a Ziegler-Natta type catalyst in the presence of a specified compound that results in the production of polymeric products having a nar... | 08/19/2003 |
| 6586543 | Process for the preparation of substantially amorphous poly--olefins The present invention provides a process for preparing a substantially amorphous poly--olefin, which includes: a) preforming a solid catalyst and, optionally, a first amount of a trialkylaluminum cocatalyst, by contacting the catalyst and optionally the... | 07/01/2003 |
| 6521726 | Method of producing a polymer A polymer of ethylenically unsaturated monomer, for example, 1,3-butadiene, having a desired molecular weight and distribution thereof is produced, with a high stability, by preparing a solution of hydrogen in an inert organic solvent for the monomer in w... | 02/18/2003 |
| 6384163 | Spherical catalyst, process for preparing a spherical polyethylene of ultra-high molecular weight A process for preparing a spherical polyethylene of ultra-high molecular weight. A process for preparing a spherical support for the polymerization of alpha-olefins from an ammonium dawsonite which is spray-dried and formed into spherical particles which ... | 05/07/2002 |
| 6291613 | Process for the polymerization of olefins A novel process for the polymerization of olefins is provided. The process involves contacting at least one olefin with a Ziegler-Natta catalyst in the presence of dinitrogen monoxide in the production of polymeric products having a narrower molecular wei... | 09/18/2001 |
| 6288183 | Catalyst composition and process for controlling the characteristics of conjugated diene polymers A catalyst composition that is the combination of or the reaction product of ingredients including an iron-containing compound, a hydrogen phosphite, and a mixture of two or more organoaluminum compounds. This catalyst composition is particularly useful f... | 09/11/2001 |
| 6207727 | Photoinitiator mixtures containing acylphosphinoxides and benzophenone derivatives A photoinitiator mixture comprising a) at least one acyl- or diacylphosphine oxide of the formula I ##STR1## and b) at least one benzophenone derivative of the formula ##STR2##... | 03/27/2001 |
| 6207607 | Composition containing magnesium, titanium, halogen and an inner electron donor, its preparation and use for the polymerization of alpha-olefins Disclosed is the homogenous reaction at 40-200° C. of MgX12 -nR1 OH (where n=2.0-6.4) with TiX24 and a higher (C6 -C20) alkyl ester of a carboxylic acid, optionally in the prese... | 03/27/2001 |
| 6191238 | Process for producing polyolefins A novel process for producing homopolymers and interpolymers of olefins which involves contacting an olefin and/or an olefin and at least one or more other olefin(s) under polymerization conditions with a Ziegler-Natta catalyst and dinitrogen monoxide in ... | 02/20/2001 |
| 6187879 | Process for producing polyolefins A novel process for producing homopolymers and interpolymers of olefins which involves contacting an olefin and/or an olefin and at least one or more other olefin(s) under polymerization conditions with an olefin polymerization catalyst and dinitrogen mon... | 02/13/2001 |
| 6004677 | Gas phase production of polydienes with pre-activated nickel catalysts There is provided a process for producing polydienes, such as polybutadiene and polyisoprene, in a gas phase fluidized bed reactor using a pre-activated nickel catalyst which is highly active for cost effective production of these dienes in gas phase.... | 12/21/1999 |
| 5905125 | Process for producing polybutadiene A high cis-1,4-polybutadiene is produced, with reduced gel formation, by preparing a catalyst from (A) a cobalt compound, (B) a trialkyl (C1-10) aluminum compound, (C) a halide compound selected from those of formulae (1) and (2): (1) AlR2... | 05/18/1999 |
| 5780563 | Supported lewis acid catalysts derived from superacids useful for hydrocarbon conversion reactions A supported Lewis acid catalyst system for catalyzing hydrocarbon conversion reactions including cationic polymerization, alkylation, isomerization and cracking reactions is disclosed, wherein the catalyst system comprises an inorganic oxide support havin... | 07/14/1998 |
| 5744556 | Gas phase polymerization employing unsupported catalysts A process for the gas-phase polymerization of polymers which allows for the introduction of an unsupported polymerization catalyst system into the gas-phase reactor, wherein the unsupported polymerization catalyst system comprises (i) a non-volatile mater... | 04/28/1998 |
| 5731393 | Ethylene polymer, process for preparing the same, solid titanium catalyst component for ethylene polymerization and ethylene polymerization catalyst An ethylene polymer having small values of Mw/Mn and Mz/Mw, a small proportion of long-chain branches and a high swell ratio and a process for preparing the polymer are disclosed. A solid titanium catalyst component obtained by initially contacting a soli... | 03/24/1998 |
| 5571619 | Fibers and oriented films of polypropylene higher -olefin copolymers A propylene, -olefin copolymer, where the -olefin has 5 or more carbon atoms made with a metallocene catalyst system provides substantially higher cold flow resistance from when the propylene copolymer is made with an -olefin having 4... | 11/05/1996 |
| 5552358 | Polymerization catalyst systems, their production and use This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The method for preparing the catalyst system of the invention provides for an optionally supported, metallocene catalyst component which when utilized... | 09/03/1996 |
| 5543479 | Process for the production of polyisoolefins Polyisoolefins are produced according to the invention by polymerizing isoolefins having 4 to 16 carbon atoms, optionally with conjugated diolefins having 4 to 6 carbon atoms and/or cationically polymerizable, mono- or polyunsaturated, organic compounds h... | 08/06/1996 |
| 5527867 | Process for producing polyolefins A process is provided to produce polyolefins having a multimodal molecular weight distribution at the molecular level by contacting at least one mono-1-olefin in a polymerization zone, under polymerization conditions, with dual site supported chromium pol... | 06/18/1996 |
| 5468822 | Polybutadiene composition and process for producing same A 1,2-polybutadiene composition having an excellent reinforcing effect for rubber and synthetic resin materials including at least two polybutadiene components different in melting point from each other and each having, as a main structure, a 1,2-polybuta... | 11/21/1995 |
| 5466766 | Metallocenes and processes therefor and therewith A method is provided for forming a supported cyclopentadiene-type compound comprising contacting a cyclopentadiene-type compound containing an active halogen with an inorganic support having surface hydroxyl group. Also there is provided a method of prepa... | 11/14/1995 |
| 5436212 | Organoaluminoxy product, preparation, and use In accordance with the present invention, there is provided a solid organoaluminoxy product prepared by reacting an organoaluminoxane with an oxygen-containing compound selected from the group consisting of organic peroxide, alkylene oxide, or organic car... | 07/25/1995 |
| 5410002 | Process for the gas-phase polymerization of alpha-olefins The present invention relates to a process for the production of homopolymers of ethylene and copolymers of ethylene with olefins CH2 .dbd.CHR, wherein R is an alkyl or aryl radical having a number of carbon atoms of from 1 to 10, and having a ... | 04/25/1995 |
| 5385877 | Production of alpha-olefin polymers A catalyst for -olefin polymerization which comprises the following components (A) and (B): component (A), which is a transition metal compound represented by the formula Q(C5 H4-m R1m)(C5 H4-n... | 01/31/1995 |
| 5344885 | Preparation of propylene-ethylene copolymers Propylene-ethylene copolymers are obtained by two-stage polymerization from the gaseous phase in an agitated fixed bed by means of a Ziegler-Natta catalyst system that contains in addition to a titanium-containing solid component also an aluminum compound... | 09/06/1994 |
