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公开(公告)号：US20150376303A1
公开(公告)日：2015-12-31
申请号：US14760949
申请日：2013-12-18
发明人： Massimo Covezzi , Gabriele Mei , Pietro Baita , Lorella Marturano
IPC分类号： C08F10/02
CPC分类号： C08F10/02 , C08F2/005 , C08F2410/02 , C08F110/02 , C08F2500/12 , C08F2500/18 , C08F2500/24
摘要： A process for the preparation of ethylene polymers comprising polymerizing ethylene, optionally with one or more α-olefin comonomers, in the presence of:(i) a solid catalyst component comprising titanium, magnesium, halogen and optionally an internal electron-donor compound, (ii) an aluminum alkyl compound, and (iii) an antistatic compound selected among the hydroxyesters with at least two free hydroxyl groups, wherein the weight ratio of aluminum alkyl compound to solid catalyst component is higher than 0.80 and the weight ratio of antistatic compound to aluminum alkyl compound is higher than 0.10.
摘要翻译： 一种用于制备乙烯聚合物的方法，包括在以下存在下聚合乙烯，任选与一种或多种α-烯烃共聚单体：（i）包含钛，镁，卤素和任选的内电子给体化合物的固体催化剂组分（ ii）铝烷基化合物，和（iii）选自具有至少两个游离羟基的羟基酯中的抗静电化合物，其中烷基铝化合物与固体催化剂组分的重量比高于0.80，抗静电化合物与 铝烷基化合物高于0.10。
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公开(公告)号：US10792637B2
公开(公告)日：2020-10-06
申请号：US16477283
申请日：2017-12-15
发明人： Enrico Balestra , Tiziana Caputo , Massimo Covezzi , Maurizio Dorini , Antonio Mazzucco , Gabriele Mei , Ricardo Rinaldi
摘要： A fluid is fed into a polymer bed of a fluidized bed gas phase polymerization reactor by introducing the fluid into the polymer bed through a distributor protruding into the fluidized bed zone of the reactor and terminating with a discharge end positioned so that the following equation is fulfilled: d/D>0.002 wherein d is the distance of the distributor's discharge end from the wall of the reactor, and D is the diameter of the reactor in the fluidized bed zone.
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公开(公告)号：US09938359B2
公开(公告)日：2018-04-10
申请号：US14760949
申请日：2013-12-18
发明人： Massimo Covezzi , Gabriele Mei , Pietro Baita , Lorella Marturano
IPC分类号： C08F10/02 , C08F2/34 , C08F2/44 , C08F2/00 , C08F110/02
CPC分类号： C08F10/02 , C08F2/005 , C08F2410/02 , C08F110/02 , C08F2500/12 , C08F2500/18 , C08F2500/24
摘要： A process for the preparation of ethylene polymers comprising polymerizing ethylene, optionally with one or more α-olefin comonomers, in the presence of:(i) a solid catalyst component comprising titanium, magnesium, halogen and optionally an internal electron-donor compound,(ii) an aluminum alkyl compound, and(iii) an antistatic compound selected among the hydroxyesters with at least two free hydroxyl groups,wherein the weight ratio of aluminum alkyl compound to solid catalyst component is higher than 0.80 and the weight ratio of antistatic compound to aluminum alkyl compound is higher than 0.10.
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公开(公告)号：US10730974B2
公开(公告)日：2020-08-04
申请号：US15750469
申请日：2016-08-03
发明人： Giampiero Morini , Massimo Covezzi , Tiziano Dall'occo , Dario Liguori , Fabrizio Piemontesi , Gianni Vitale
IPC分类号： C08F110/06 , C08F4/654 , C08F4/655 , C08F4/656 , C08F4/651 , C08F10/06 , C08F110/02 , C08F2/34 , C08F4/649
摘要： A gas-phase process for the homopolymerization or copolymerization of propylene with other olefins, including carrying out the polymerization in the presence of a catalyst system made from or containing: (a) a solid catalyst component made from or containing Mg, Ti, halogen, an electron donor selected from 1.3-diethers and an olefin polymer in a specific amount; (b) an aluminum alkyl compound and (c) an external electron donor (ED) compound, wherein components (b) and (c) being employed in amounts such that the Al/(ED) molar ratio ranges from about 2 to about 200.
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公开(公告)号：US10556972B2
公开(公告)日：2020-02-11
申请号：US16347124
申请日：2017-11-02
发明人： Pietro Baita , Massimo Covezzi , Maria Di Diego , Lorella Marturano , Antonio Mazzucco , Gabriele Mei , Roberta Pica
IPC分类号： C08F110/02 , C08F210/02 , C08F2/34 , C08F10/02
摘要： A gas-phase process for the homopolymerization or copolymerization of olefins carried out in the presence of a catalyst system formed by a contacting, in a liquid hydrocarbon and in the presence of hydrogen, (a) a solid catalyst component comprising Ti, Mg, and Cl, and optionally an internal electron donor compound, (b) an aluminum alkyl compound and optionally (c) an external donor compound.
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公开(公告)号：US10155888B2
公开(公告)日：2018-12-18
申请号：US15400734
申请日：2017-01-06
发明人： Massimo Covezzi , Gabriele Mei , Maria Di Diego , Piero Gessi , Pietro Baita , Roberta Pica
IPC分类号： C09J151/06 , C08F10/00 , C08F110/02 , B32B7/12 , B32B15/085 , B32B27/06 , C08L23/06 , C08L23/20 , C08L51/06 , C09J5/02 , C09J123/06 , C09J123/20
摘要： The present technology relates to a method of introducing a supported antistatic compound that does not comprise a transition-metal-based catalyst component for use in an olefin polymerization reactor. In some embodiments, the methods disclosed herein avoid the formation of polymer agglomerates in the reactor and minimize potentially negative effects on catalyst yield.
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