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公开(公告)号：US06642323B1
公开(公告)日：2003-11-04
申请号：US09674912
申请日：2000-11-08
IPC分类号： C08F234
CPC分类号： C08F10/00 , C08F10/02 , C08F110/02 , C08L23/06 , C08L2205/02 , Y10S526/901 , Y10S526/905 , C08F4/651 , C08F4/6555 , C08F2/001 , C08L2666/04 , C08F2500/12 , C08F2500/18 , C08F2500/19 , C08F2500/02 , C08F2500/01
摘要： The present invention concerns a process for producing homogeneous polyethylene compositions and processes for making high density, medium density and low density films therefrom. The process comprises carrying out the polymerization in the presence of an ethylene-polymerizing catalyst system in a multistage reaction sequence of successive polymerization stages, at least one of which is a loop polymerization stage, and at least one of which is a gas phase polymerization stage. According to the invention, said loop polymerization stage is operated using a diluent selected from the group of linear and branched C4-C6 hydrocarbons and/or mixtures thereof. The reactor sequence is operated with different amounts of hydrogen and comonomers to produce a high molecular weight portion in one of the polymerization stages and a low molecular weight portion in another, so as to provide bimodal polyethylene composition with a low molecular weight part having an MFR2 of 250 g/10 min or more. The obtained material is homogenous and the fines level in the process is low.
摘要翻译： 本发明涉及用于制备均匀的聚乙烯组合物的方法和从其制备高密度，中密度和低密度的薄膜的方法。 该方法包括在乙烯聚合催化剂体系的存在下，在连续聚合阶段的多阶段反应顺序中进行聚合，其中至少一个是环聚合阶段，并且其中至少一个是气相聚合反应阶段 。 根据本发明，所述环路聚合阶段使用选自直链和支链C 4 -C 6烃和/或其混合物的稀释剂进行操作。 反应器序列用不同量的氢和共聚单体操作以在聚合阶段之一和另一个聚合阶段中的低分子量部分产生高分子量部分，以便提供具有MFR 2的低分子量部分的双峰聚乙烯组合物 为250g / 10min以上。 获得的材料是均匀的，并且该方法中的细粉水平低。
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公开(公告)号：US06552150B1
公开(公告)日：2003-04-22
申请号：US09601366
申请日：2000-09-14
IPC分类号： C08F1002
CPC分类号： C08F10/02 , C08L23/04 , C08L23/0815 , C08L2205/02 , C08F2/001 , C08L2666/04
摘要： The present invention concerns a polyethylene composition particularly suitable for film blowing. The invention also concerns a process for the production thereof. The composition comprises a low molecular weight portion having a density of more than 960 kg/m3 and a high molecular weight portion. The polyethylene composition has a density of about 925-940 kg/m3 and a melt flow rate in the range of MFR21, from 5 to 40 g/10 min. A polyethylene film blown from the polyethylene composition exhibits a tensile strength at yield in transverse direction at least 15 MPa, a 1% secant modulus in machine direction at least 300 MPa and in transverse direction at least 400 MPa, and a dart drop of at least 5 g/&mgr;m.
摘要翻译： 本发明涉及特别适用于吹膜的聚乙烯组合物。 本发明还涉及其生产方法。 组合物包含密度高于960kg / m 3的高分子量部分的低分子量部分。 聚乙烯组合物的密度为约925-940kg / m 3，熔体流动速率在MFR 21范围内，为5至40g / 10min。 从聚乙烯组合物吹出的聚乙烯薄膜在横向收缩率表现出拉伸强度至少为15MPa，机器方向上的1％割草模数至少为300MPa，横向为至少400MPa，并且至少具有飞镖滴 5g / mum。
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