Patent application number | Description | Published |
20090062487 | Olefin polymerization process - A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin and a catalyst comprising an activator and a supported bridged indeno[1,2-b]indolyl zirconium complex. The process produces polyethylene characterized by good incorporation of the α-olefin and low long-chain branching. The process is capable of forming high-molecular-weight polyethylene and has good hydrogen sensitivity. | 03-05-2009 |
20090062488 | Olefin polymerization process - A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin and a catalyst comprising an activator and a supported bridged indeno[1,2-b]indolyl zirconium complex. The process produces polyethylene characterized by good incorporation of the α-olefin and moderate long-chain branching. The process is capable of forming high molecular weight polyethylene and has good catalyst activity. | 03-05-2009 |
20090062489 | Olefin polymerization process - A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin and a catalyst comprising an activator and a supported bridged bis-indeno[2,1-b]indolyl zirconium complex. The process uses a highly active catalyst and provides polyethylene characterized by a high level of long-chain branching. | 03-05-2009 |
20090062490 | Olefin polymerization process - A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin, hydrogen, and a catalyst comprising an activator and a supported, dimethylsilyl-bridged bis(indenoindolyl)zirconium complex. The process has high catalyst activity and produces polyethylene having a broad molecular weight distribution. | 03-05-2009 |
20090275711 | Olefin polymerization process - A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in a first reactor in the presence of hydrogen and a catalyst comprising an activator and a supported dimethylsilyl-bridged indeno[1,2-b]indolyl zirconium complex to produce an ethylene homopolymer, removing some of the unreacted hydrogen, and reacting the homopolymer slurry in a second reactor with ethylene and a C | 11-05-2009 |
20090292087 | Olefin polymerization process - A process for making polyethylene having an uncommon but valuable balance of broad molecular weight distribution and a low level of long-chain branching is disclosed. The process comprises polymerizing ethylene in a single reactor in the presence of an α-olefin and a catalyst comprising an activator and a supported dialkylsilyl-bridged bis(indeno[1,2-b]indolyl)zirconium complex. The polyethylene, which has an M | 11-26-2009 |
20100129924 | Quality assurance method for olefin polymerization catalysts - A method for evaluating the quality of an olefin polymerization catalyst is disclosed. A single-site organometallic complex is reacted with a methyl alumoxane under controlled reaction conditions. The extent and/or dynamics of methane formation from the reaction are measured, and the results are used to predict the suitability of the complex and/or the methyl alumoxane for use in an olefin polymerization. | 05-27-2010 |
20110021344 | Method for preparing non-metallocene ligands - A method of preparing supported catalysts useful for olefin polymerization is described. The catalysts comprise a Group 4 metal complex that incorporates a tridentate dianionic ligand. An activator mixture is first made from a boron compound having Lewis acidity and an excess of an alumoxane. The activator mixture is then combined with a support and the Group 4 metal complex to give a supported catalyst. The method provides an active, supported catalyst capable of making high-molecular-weight polyolefins. | 01-27-2011 |
20110021727 | Catalysts based on 2-(2-aryloxy)quinoline or 2-(2-aryloxy)dihydroquinoline ligands - Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a Group 4 metal complex that incorporates a dianionic, tridentate 2-(2-aryloxy)quinoline or 2-(2-aryloxy)dihydroquinoline ligand. In one aspect, supported catalysts are prepared by first combining a boron compound having Lewis acidity with excess alumoxane to produce an activator mixture, followed by combining the activator mixture with a support and the tridentate, dianionic Group 4 metal complex. The catalysts are easy to synthesize, support, and activate, and they enable facile production of high-molecular-weight polyolefins. | 01-27-2011 |
20110082268 | Indazole-modified ziegler-natta catalyst system - A modified Ziegler-Natta catalyst system, a method for preparing the catalyst system, and a process for polymerizing an olefin in the presence of the catalyst system are disclosed. The catalyst system comprises a titanium or vanadium compound, an aluminum compound, and an indazole. Improved comonomer incorporation and the ability to regulate molecular weight are achieved in the manufacture of polyolefins. | 04-07-2011 |
20110082269 | Nitroso-modified ziegler-natta catalyst system - A modified Ziegler-Natta catalyst system, a method for preparing the catalyst system, and a process for polymerizing an olefin in the presence of the catalyst system are disclosed. The catalyst system comprises a titanium compound, an aluminum compound, and a nitroso compound. Improved polyolefin properties, such as high molecular weight, are obtained. | 04-07-2011 |
20110082270 | Pyridazine-modified ziegler-natta catalyst system - A modified Ziegler-Natta catalyst system, a method for preparing the catalyst system, and a process for polymerizing an olefin in the presence of the catalyst system are disclosed. The catalyst system comprises a titanium or vanadium compound, an aluminum compound, and a pyridazine. Improved properties such as increased molecular weight and narrowed molecular weight distribution are obtained. | 04-07-2011 |
20110213107 | Activation of monocyclopentadienyl group 6 complexes - A method for preparing a supported catalyst suitable for use in slurry and gas-phase olefin polymerizations is disclosed. An alumoxane-treated silica is combined with a monocyclopentadienyl Group 6 metal complex that comprises a chelating Cp moiety to give the supported catalyst. The method is simple to practice and provides catalysts having high activity. Polyolefins made using the catalysts have high molecular weight that is readily controlled by adding hydrogen. | 09-01-2011 |
20110251362 | Olefin polymerization catalysts - Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a Group 4 transition metal complex which comprises at least one monoanionic R | 10-13-2011 |
20110294972 | Olefin Polymerization Catalysts - The invention relates to transition metal complexes comprising a metal of group 3, 4, or 6 of the Periodic Table of the Elements and one, or two mono-anionic triazole ligands It has been found that these transition metal complexes which comprise at least one triazole fragment having a substituent with an unsaturated fragment are suitable as precatalysts for the polymerization of olefins. In these complexes one carbon atom of the unsaturated fragment is bound directly or via a bridge to a triazole group and the other carbon atom is bound to the transition metal. The complexes are useful as catalysts for olefin polymerization, a catalyst system comprising these complexes and a process for the polymerization of olefins under the use of the catalyst system. | 12-01-2011 |
20110306740 | CATALYSTS FOR OLEFIN POLYMERIZATION - Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a bridged cyclopentadienyl complex that incorporates a monoanionic hydroxylamido or hydrazido ligand fragment. Suitable complexes have the structure: | 12-15-2011 |
20120016092 | Catalysts based on quinoline precursors - Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise a transition metal complex, an optional activator, and an optional support. The complex is the reaction product of a Group 3-6 transition metal source, an optional alkylating agent, and a ligand precursor comprising a 2-imino-8-anilinoquinoline or a 2-aminoalkyl-8-anilinoquinoline. The catalysts, which are easy to synthesize by in-situ metallation of the ligand precursor, offer polyolefin manufacturers good activity and the ability to make high-molecular-weight ethylene copolymers that have little or no long-chain branching. | 01-19-2012 |
20130023632 | CATALYST SYSTEM BASED ZIRCONIUM - A catalyst system obtainable with a process comprising the following steps:
| 01-24-2013 |
20130023634 | CATALYST SYSTEM BASED ON QUINOLINE DONORS - A catalyst system obtainable with a process comprising the following steps:
| 01-24-2013 |