发明授权
- 专利标题: Elastic substantially linear ethylene polymers
- 专利标题(中): 弹性基本线性乙烯聚合物
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申请号: US09440431申请日: 1999-11-15
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公开(公告)号: US06534612B1公开(公告)日: 2003-03-18
- 发明人: Shih-Yaw Lai , John R. Wilson , George W. Knight , James C. Stevens
- 申请人: Shih-Yaw Lai , John R. Wilson , George W. Knight , James C. Stevens
- 主分类号: C08F11002
- IPC分类号: C08F11002
摘要:
Elastic ethylene polymers are disclosed which have processability similar to highly branched low density polyethylene (LDPE), but the strength and toughness of linear low density polyethylene (LDPE). The polymers have processing indices (PI's) less than or equal to 70 percent of those of a comparative linear ethylene polymer and a critical shear rate at onset of surface melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a traditional linear ethylene polymer at about the same I2and Mw/Mn. The novel polymers can also have from about 0.01 to about 3 long chain branches/1000 total carbons and have higher low/zero shear viscosity and lower high shear viscosity than comparative linear ethylene polymers. The novel polymers can also be characterized as having a melt flow ratio, I10/I2, ≧5.63, a molecular weight distribution, Mw/Mn, defined by the equation: Mw/Mn≦(I10/I2)−4.63, a critical shear stress at onset of gross melt fracture greater than about 4×106 dyne/cm2, and a single DSC melt peak between −30 C and 150 C.
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