Polyethylene composition having high swell ratio

A polyethylene composition comprising:

• 1) a density from 0.952 to 0.960 g/cm3 as determined according to ISO 1183 at 23° C.;
• 2) aMIF/MIP ratio from 17 to 30, wherein MIF is the melt flow index at 190° C. with a load of 21.60 kg, and MIP is the melt flow index at 190° C. with a load of 5 kg, both determined according to ISO 1133;
• and
• 3) a SIC Index from 2.5 to 5.0;
• wherein the SIC Index is the Shear-Induced Crystallization Index, determined according to the following relation:
• SIC Index=((tonset,SIC@1000×tonset, quiescent)/((HLMI)*100)
• where tonset,SIC@1000 is measured in seconds and is the time required for crystallization onset under shear rate of 1000 s−1, the t onset, quiescent is measured in seconds and is the crystallization onset time at temperature of 125° C. under no shear, determined in isothermal mode by differential scanning calorimetry;
• HLMI is the melt flow index determined at 190° C. with a load of 21.6 kg, according to ISO 1133.