POLYETHYLENE BLEND WITH IMPROVED ESCR

摘要

A high-density polyethylene (HDPE) blend comprising: (I) 90 to 99.5 wt% of a lower molecular weight multimodal HDPE component having a density of at least 940 kg/m3 having an MFR2 of 0.1 g/10min or more; and (II) 0.5 to 10 wt% of a higher molecular weight multimodal HDPE component different from component (I) having a density of at least 940 kg/m3 and having an MFR5 of less than 2 g/10min; wherein the blend has a density of at least 940 kg/m3 and an environmental stress crack resistance (ESCR) of at least 30 hours measured according to the full notch creep test (FNCT) (ISO 16770) at 50°C and 6 MPa.