发明授权
- 专利标题: High tear films from hafnocene catalyzed polyethylenes
- 专利标题(中): 来自茂名催化聚乙烯的高泪膜
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申请号: US11098077申请日: 2005-04-04
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公开(公告)号: US07179876B2公开(公告)日: 2007-02-20
- 发明人: John F. Szul , James McLeod Farley , Laughlin G. McCullough , Ryan Winston Impelman
- 申请人: John F. Szul , James McLeod Farley , Laughlin G. McCullough , Ryan Winston Impelman
- 申请人地址: US TX Houston
- 专利权人: Univation Technologies, LLC
- 当前专利权人: Univation Technologies, LLC
- 当前专利权人地址: US TX Houston
- 代理商 Kevin M. Faulkner; Leandro Arechederra
- 主分类号: C08F210/16
- IPC分类号: C08F210/16 ; C08F4/64 ; C35B27/32
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.
公开/授权文献
- US20050171283A1 High tear films from hafnocene catalyzed polyethylenes 公开/授权日:2005-08-04
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