摘要:
A high-temperature solution process for polymerizing ethylene is disclosed. The polymerization is performed in the presence of a preassembled bimetallic Ziegler-Natta catalyst and an aluminum compound. Molecular modeling calculations predict that the bimetallic Ziegler-Natta catalyst will have good activity and improved stability versus traditional Ziegler-Natta catalysts. This makes the catalyst especially suitable for solution polymerization processes, which require a thermally robust catalyst.
摘要:
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.
摘要:
A process for making ethylene copolymers is disclosed. Ethylene copolymerizes with an α-olefin in the presence of a catalyst system comprising an activator and a silica-supported, bridged indenoindolyl metal complex having “open architecture.” The supported complex incorporates comonomers with exceptional efficiency, and the process gives ethylene copolymers having high molecular weights (Mw>100K) and very low densities (
摘要翻译:公开了制备乙烯共聚物的方法。 在包含活化剂和具有“开放结构”的二氧化硅负载的桥连茚并吲哚基金属络合物的催化剂体系的存在下,乙烯与α-烯烃共聚。 支持的络合物以卓越的效率引入共聚单体,该方法得到具有高分子量(Mw> 100K)和非常低密度(<0.910G / CM 3)的乙烯共聚物。 还描述了包括连接吲哚吲哚基骨架的吲哚基氮的开放式结构催化剂。 另外,负载和未负载的茚并[1,2-b]吲哚基催化剂在弹性体聚丙烯和乙烯共聚物的制备中提供了卓越的活性。
摘要:
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.
摘要:
A method for making ethylene polymers and copolymers is disclosed. The method uses a catalyst system comprising a low level of an aluminum-containing activator, a bridged indenoindolyl transition metal complex, and a treated silica support. The method enables economical preparation of ethylene copolymers having very low density. The silica-supported, bridged complexes incorporate comonomers efficiently and are valuable for a commercial slurry loop process. Use of a bridged indeno[2,1-b]indolyl complex provides exceptionally efficient comonomer incorporation, and gives polymers with a substantial and controlled level of long-chain branching. The method facilitates the production of a wide variety of polyolefins, from HDPE to plastomers.
摘要:
A new class of zwitterionic metallocycles is disclosed. A positively charged Group 4-10 transition metal is chelated to two heteroatoms and one of the heteroatoms has a substituent bearing a negative charge. We have found that substitution in this position stabilizes the zwitterion form of the metallocycle. The zwitterionic metallocycle is useful for olefin polymerizations.
摘要:
A process for making ethylene copolymers is disclosed. Ethylene copolymerizes with an &agr;-olefin in the presence of a catalyst system comprising an activator and a silica-supported, bridged indenoindolyl metal complex having “open architecture.” The supported complex incorporates comonomers with exceptional efficiency, and the process gives ethylene copolymers having high molecular weights (Mw>100K) and very low densities (
摘要翻译:公开了制备乙烯共聚物的方法。 在包含活化剂和具有“开放结构”的二氧化硅负载的桥连茚并吲哚基金属络合物的催化剂体系的存在下,乙烯与α-烯烃共聚。 支持的络合物以非常有效的方式引入共聚单体,该方法得到具有高分子量(Mw> 100K)和非常低密度(<0.910g / cm 3)的乙烯共聚物。 还描述了包括连接吲哚吲哚基骨架的吲哚基氮的开放式结构催化剂。
摘要:
A device for providing a video signal of a virtual image based on a real image of a camera, the real image having an object, includes a processing device. One piece of positional information each is associated with the camera and the object. The processing device generates the video signal of the virtual image based on the real image, the positional information of the camera and the positional information of the object. The virtual image includes an illustration of the object or object information with regard to the object.
摘要:
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.
摘要:
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.