Polyolefin resin blends for high stress cracking resistance and good processability

A polyethylene composition comprising a melt blend, the melt blend comprising:

• a) a first multimodal polyethylene, the first multimodal polyethylene having a medium weight average molecular weight from 90,000 to 200,000 g/mol or a high weight average molecular weight from 200,000 to 1,000,000 g/mol, a density of more than 0.950 to 0.965 g/cm3 according to ISO 1183 and a MFR2 of 0.3 to 2.0 g/10 min according to ISO 1133;
• and
• b) a second multimodal polyethylene, the second multimodal polyethylene having a high weight average molecular weight from 200,000 to 1,000,000 g/mol, a density of 0.940 to 0.950 g/cm3 according to ISO 1183 and a MFR2 of 0.03 to 0.15 g/10 min according to ISO 1133;
• wherein the polymer composition has a Full Notch Creep Test (FNCT) according to ISO 16770 of at least 58 hours and a Charpy impact strength at a temperature of 23° C. of at least 4 kJ/m2 according to ISO 179.