HIGH-DENSITY POLYETHYLENE COMPOSITIONS AND METHOD OF MAKING THE SAME

摘要

The instant invention is a high-density polyethylene composition, method of making the same, and articles made therefrom. The high-density polyethylene composition of the instant invention includes an ethylene alpha-olefin copolymer having a density in the range of 0.935 to 0.952 g/cm³, a melt index (I₂) in the range of 30 to 75 g/10 minutes, an I₂₁ / I₂ ratio in the range of 13-35, a M_w/M_n ratio in the range of 3.5-8. The high-density polyethylene composition has a brittleness temperature of at least less than -20 °C. The process for producing a high-density polyethylene composition according to instant invention includes the following steps: (1) introducing ethylene, and one or more alpha-olefin comonomers into a reactor; (2) (co)polymerizing the ethylene in the presence of the one or more alpha-olefin comonomers in the reactor; and (3) thereby producing the high-density polyethylene composition, wherein the high- density polyethylene composition having a density in the range of 0.935 to 0.952 g/cm³, a melt index (I2) in the range of 30 to 75 g/10 minutes, an I₂₁ / I₂ ratio in the range of 13-35, a M_w/M_n ratio in the range of 3.5-8, and a brittleness temperature of at least less than -20 "C. Articles according to the instant invention include the inventive high-density polyethylene composition.