The effect that 6-tert-butoxyhexyl functionalization has on ethylene polymerization in ansa-zirconocene dichlorides
摘要:
New ansa-zirconocene dichloride derivatives have been prepared, which have a 6-t-butoxyhexyl pendant introduced either on a Cp-ring-carbon or at the silicon and carbon ansa-bridging atom. Ethylene polymerization studies have been carried out with novel precatalysts of the type: [(eta(5)-C13H8)-X(t-BuOC6H12)Me-(eta(5)-C5H4)]ZrCl, [X=C [1a], Si [2a]], [(eta(5)-C13H8)-XMe2-(eta(5)-(t-BuOC6H12C5H3))] ZrCl, [X = C [3a], Si [4a]] in the presence of excess methylalumoxane (MAO) to compare their catalytic activity and to delineate the effect of the 6-t-butoxyhexyl functionality on ethylene polymerization. The precatalysts [1a] and [2a] with the bridge functionality showed higher activity in ethylene polymerization than the corresponding complexes [3a] and [4a] which have it on the Cp ring moiety. On the other hand the silyl bridged complexes [2a] and [4a] produced a higher molecular weight polyethylene than the carbon-bridged one, regardless of the location of functional group. (C) 2003 Elsevier B.V. All rights reserved.
The effect that 6-tert-butoxyhexyl functionalization has on ethylene polymerization in ansa-zirconocene dichlorides
摘要:
New ansa-zirconocene dichloride derivatives have been prepared, which have a 6-t-butoxyhexyl pendant introduced either on a Cp-ring-carbon or at the silicon and carbon ansa-bridging atom. Ethylene polymerization studies have been carried out with novel precatalysts of the type: [(eta(5)-C13H8)-X(t-BuOC6H12)Me-(eta(5)-C5H4)]ZrCl, [X=C [1a], Si [2a]], [(eta(5)-C13H8)-XMe2-(eta(5)-(t-BuOC6H12C5H3))] ZrCl, [X = C [3a], Si [4a]] in the presence of excess methylalumoxane (MAO) to compare their catalytic activity and to delineate the effect of the 6-t-butoxyhexyl functionality on ethylene polymerization. The precatalysts [1a] and [2a] with the bridge functionality showed higher activity in ethylene polymerization than the corresponding complexes [3a] and [4a] which have it on the Cp ring moiety. On the other hand the silyl bridged complexes [2a] and [4a] produced a higher molecular weight polyethylene than the carbon-bridged one, regardless of the location of functional group. (C) 2003 Elsevier B.V. All rights reserved.
Hybrid supported catalyst system and method of preparing polyolefin using the same
申请人:LG CHEM, LTD.
公开号:US10189920B2
公开(公告)日:2019-01-29
Provided are a hybrid supported catalyst system and a method of preparing a polyolefin using the same. The hybrid supported catalyst system according to the present invention may be used to perform oligomerization and copolymerization of olefin monomers in a single reactor at the same time with high efficiency without a separate process of preparing alpha-olefin. Therefore, costs for preparing or purchasing comonomers which are expensive raw materials may be reduced, thereby reducing the production cost of a final product.
The present invention provides a method for preparing a polyolefin having a broad molecular weight distribution. More specifically, the present invention provides a method for preparing a polyolefin having a broad molecular weight distribution and an ultra-high molecular weight in which an organometallic complex containing a specific Ti-Al complex structure is used as a molecular weight controller (i.e., molecular weight enhance) in the polymerization of an olefin monomer, thereby enabling both solution polymerization and slurry polymerization, particularly enabling the molecular weight distribution to be more readily and effectively controlled.
The present invention relates to polyolefin. More specifically, the present invention relates to polyolefin having excellent dart drop impact strength, and exhibiting improved transparency.
本发明涉及聚烯烃。更具体地说,本发明涉及的聚烯烃具有极佳的落镖冲击强度,并具有更好的透明度。
Method for preparing polyolefin
申请人:LG CHEM, LTD.
公开号:US10870712B2
公开(公告)日:2020-12-22
The present invention provides a method for preparing a polyolefin having a broad molecular weight distribution. More specifically, the present invention provides a method for preparing a polyolefin having a broad molecular weight distribution and an ultra-high molecular weight in which an organometallic complex containing a specific Ti—Al complex structure is used as a molecular weight controller (i.e., molecular weight enhance) in the polymerization of an olefin monomer, thereby enabling both solution polymerization and slurry polymerization, particularly enabling the molecular weight distribution to be more readily and effectively controlled.