| 摘要 |
<p>The invention is a polyethylene composition having a polydispersity index of less than or equal to 3, an average branching index (g') as measured by GPC/Vis≥0.9, and a melt strength (MS) (centipoise, 190 °C) that satisfies the relationship: MS≥3.0/Melt Index (2.16Kg/190 °C)+4.5. In a preferred embodiment, these polyethylene compositions comprise A) branched polyethylene copolymers prepared by insertion polymerization of ethylene, ethylene-containing macromers, and optionally, additional copolymerizable monomers, and B) essentially linear ethylene copolymers. Improved melt strength without sacrifing the benefits of narrow polydispersity index are exhibited by the invention compositions.</p> |
