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公开(公告)号:US06936675B2
公开(公告)日:2005-08-30
申请号:US10737654
申请日:2003-12-15
IPC分类号: B29C47/88 , B32B27/00 , B32B27/32 , C08F4/06 , C08F4/44 , C08F4/64 , C08F4/659 , C08F8/00 , C08F10/00 , C08F210/14 , C08F210/16 , C08J5/18 , C08L23/08 , B35B27/32
CPC分类号: C08F10/00 , B29C47/0021 , B29C47/0026 , B29C47/8845 , B29C47/92 , B29C2947/92514 , B29C2947/92704 , B29C2947/92895 , B29C2947/92904 , C08F4/65912 , C08F4/65916 , C08F210/16 , C08J5/18 , C08J2323/08 , Y10T428/31938 , C08F4/65925 , C08F210/14 , C08F2500/12 , C08F2500/03 , C08F2500/06 , C08F2500/11 , C08F2500/26
摘要: A polyethylene film having a balance of improved physical and mechanical properties and a method for making the same are provided. In one aspect, the film includes a 1% secant modulus of greater than 25,000 psi, a dart impact resistance of greater than 500 g/mil, and a MD tear strength of greater than 500 g/mil. In one aspect, the method comprises reacting ethylene derived units and a comonomer in the presence of a hafnium-based metallocene at a temperature of from 70° C. and 90° C., an ethylene partial pressure of from 120 psia and 260 psia, and a comonomer to ethylene ratio of from 0.01 to 0.02 to produce an ethylene based polymer. The method further comprises extruding the ethylene based polymer at conditions sufficient to produce a polyethylene film comprising a secant modulus of greater than 25,000 psi, a dart impact resistance of greater than 500 g/mil, and a MD tear strength of greater than 500 g/mil.
摘要翻译: 提供了具有改善的物理和机械性能的平衡的聚乙烯膜及其制备方法。 在一个方面,该膜包括大于25,000psi的1%割线模量,大于500g / mil的落镖冲击强度和大于500g / mil的MD撕裂强度。 在一个方面,该方法包括在铪基茂金属存在下,在70℃和90℃的温度,120psia和260psia的乙烯分压下使乙烯衍生的单元和共聚单体反应, 和共聚单体与乙烯的比例为0.01至0.02,以制备乙烯基聚合物。 该方法还包括在足以产生包含大于25,000psi的正割模数,大于500g / mil的落镖冲击强度和大于500g / mil的MD撕裂强度的聚乙烯膜的条件下挤出基于乙烯的聚合物, 密尔