Abstract:
Metal-ligand complexes that are useful as precusors to catalysts for the polymerization of olefins are provided. Certain of the catalysts are particularly effective at polymerizing ethylene and styrene into copolymers having novel properties, including a low molecular weight and close comparison between vinyl and methyl end groups.
Abstract:
The present invention provides a method of producing oligomers of olefins, comprising reacting olefins with a catalyst under oligomerization conditions. The catalyst can be the product of the combination of a chromium compound and a pyridyl ether compound. In particular embodiments, the catalyst compound can be used to trimerize or tetramerize ethylene to 1 - hexene, 1 -octene, or mixtures of 1 -hexene and 1 -octene.
Abstract:
Metal complexes comprising certain polydentate heteroatom containing ligands, catalysts, and coordination polymerization processes employing the same are suitably employed to prepare polymers having desirable physical properties.
Abstract:
Metal complexes comprising certain polydentate heteroatom containing ligands, catalysts, and coordination polymerization processes employing the same are suitably employed to prepare polymers having desirable physical properties.
Abstract:
Ligands, compositions, metal-ligand complexes and arrays with substituted bridged bis-biaromatic ligands and method of making and using the same, are disclosed that are useful in the catalysis of transformations such as the polymerization of monomers into polymers. The catalyts have high performance characteristics, including higher comonomer incorporation into ethylene/olefin copolymers, where such olefins are for exmaple, 1-octene, propylene or styrene. The catalysts also polymerize propylene into isotactic polypropylene.
Abstract:
An ethylene/α-olefin copolymer comprising a component produced by a non-single-site polymerization catalyst and a component produced by a single-site polymerization catalyst, its preparation and use are described. The copolymer has an α-olefin content of 5 to 20 percent by weight and shows at least two CRYSTAF peak temperatures differing by at least 15 °C and/or at least two DSC melting peak temperatures differing by at least 15 °C.
Abstract:
The present invention provides a method of producing oligomers of olefins, comprising reacting olefins with a catalyst under oligomerization conditions. The catalyst can be the product of the combination of a chromium compound and a heteroaryl-amine compound. In particular embodiments, the catalyst compound can be used to trimerize or tetramerize ethylene to 1-hexene, 1-octene, or mixtures of 1-hexene and 1-octene.
Abstract:
Metal-ligand complexes that are useful as precusors to catalysts for the polymerization of olefins are provided. Certain of the catalysts are particularly effective at polymerizing ethylene and styrene into copolymers having novel properties, including a low molecular weight and close comparison between vinyl and methyl end groups.
Abstract:
The field of the invention relates generally to a method for preparing very-high or ultra-high molecular weight polyethylene. More particularly, the present invention related to a method of preparing very-high or ultra-high molecular weight polyethylene using a supported catalyst comprising a support, an activator and a metal-ligand complex, as well as the catalyst itself. The present invention additionally relates to a method of using a supported catalyst comprising a support, an activator and co-supported metal-ligand complexes to obtain a bi-modal molecular weight distribution of polyethylene.
Abstract:
In one embodiment, a parallel batch reactor for effecting chemical reactions includes a vessel block (24) comprising reactor vessels (32) for receiving components of a reaction and a valve block (23) removably attached to the vessel block. The valve block (22) includes a first plurality of valves (72) in fluid communication with an inlet port for supplying pressurized fluid to the reactor vessels. (32) and configured to fluidically isolate one or more of the reactor vessels from (32) at least one of the other reactor vessels (32) The valve block (22) further includes a second plurality of valves (76) in fluid communication with the reactor vessels for injecting chemical components into the pressurized reactor vessels (32) or sampling chemical components from the pressurized reactor vessels (32) The vessel block (26) and valve block (22) are configured to sustain an operating pressure of at least 15 psig. A stirring assembly (26) may also be present.