Process for the Preparation of Supported Catalysts
申请人:Mihan Shahram
公开号:US20120283400A1
公开(公告)日:2012-11-08
The present invention refers to a process for the preparation of supported catalysts for the polymerization of olefins comprising at least a late transition metal complex, wherein the process comprises two steps. In the first step a catalytically active component comprising at least one late transition metal complex, optionally in the presence of one or more cocatalysts is mixed with a support; and in the second step the obtained mixture is treated at a reduced pressure under a flow of inert gas at a temperature equal to or below 40° C. to obtain a supported catalyst. The method is especially useful for the preparation of dual supported catalysts, useful in the gas-phase polymerization of olefins.
Process for the Polymerization of Ethylene, and Ethylene Polymers Having Broad Molecular Weight Distribution and Long-Chain Branching
申请人:Ciaccia Eleonora
公开号:US20110251360A1
公开(公告)日:2011-10-13
New ethylene polymers having broad molecular weight distribution and long-chain branching, above all at high molecular weight fractions; the polymers have strain hardening equal or higher than 1.4 (at constant elongational rate of 0.5 s
−1
, at 150° C.), branching index g′ equal or lower than 0.9 (at Mw of 2·10
6
g/mol). The polymers are prepared by using a mixed catalyst system comprising a polymerization catalyst based on a late transition metal component having a tridentate ligand, and a Ziegler polymerization catalyst annealed at a temperature higher than 100° C., for a time of at least 10 minutes.
Process for the preparation of supported catalysts
申请人:Mihan Shahram
公开号:US08859451B2
公开(公告)日:2014-10-14
The present invention refers to a process for the preparation of supported catalysts for the polymerization of olefins comprising at least a late transition metal complex, wherein the process comprises two steps. In the first step a catalytically active component comprising at least one late transition metal complex, optionally in the presence of one or more cocatalysts is mixed with a support; and in the second step the obtained mixture is treated at a reduced pressure under a flow of inert gas at a temperature equal to or below 40° C. to obtain a supported catalyst. The method is especially useful for the preparation of dual supported catalysts, useful in the gas-phase polymerization of olefins.
Process for the polymerization of ethylene, and ethylene polymers having broad molecular weight distribution and long-chain branching
申请人:Ciaccia Eleonora
公开号:US08759460B2
公开(公告)日:2014-06-24
New ethylene polymers having broad molecular weight distribution and long-chain branching, above all at high molecular weight fractions; the polymers have strain hardening equal or higher than 1.4 (at constant elongational rate of 0.5 s−1, at 150° C.), branching index g′ equal or lower than 0.9 (at Mw of 2·106 g/mol). The polymers are prepared by using a mixed catalyst system comprising a polymerization catalyst based on a late transition metal component having a tridentate ligand, and a Ziegler polymerization catalyst annealed at a temperature higher than 100° C., for a time of at least 10 minutes.
Iron Bis(Imino) Aryl Catalysts and Methods Thereof
申请人:ExxonMobil Chemical Patents Inc.
公开号:US20210179650A1
公开(公告)日:2021-06-17
The present disclosure related to iron-containing compounds including a 2,6-diiminoaryl ligand and one or more substituted hydrocarbyl substituents. Catalysts, catalyst systems, and processes of the present disclosure can provide polyolefins with high or low molecular weight, low comonomer content, narrow polydispersity indices, and broad orthogonal composition distribution. The present disclosure provides new and improved iron-containing catalysts with enhanced solubility in hydrophobic (nonpolar) solvents.