Polyethylene compositions for rotational molding

摘要

Polyethylene blend compositions suitable for rotomolding, rotomolded articles, and processes for rotomolding articles are provided. The polyethylene compositions include a first polyethylene having a melt index of 0.4 to 3.0 g/10 min and a density of from 0.910 to 0.930 g/cm³; and a second polyethylene having a melt index of 10 to 30 g/10 min and a density of 0.945 to 0.975 g/cm³. The composition has a density of from 0.930 to 0.955 g/cm³ and a melt index of 1.5 to 12 g/10 min, and the first and second polyethylenes differ in density by from 0.030 to 0.048 g/cm³. These compositions exhibit improved physical properties, such as Environmental Stress Crack Resistance and Izod Impact Strength. Articles produced from the compositions may also exhibit improved impact resistance properties, enhanced ductile break properties, and improved deflection resistance, which represents a combination of creep and fatigue resistance.