Patent ID: 8722807

Claim:
A multimodal polyethylene composition having a base resin, the base resin comprising (A) a first polyethylene fraction which is an ethylene homopolymer, and (B) a second polyethylene fraction, wherein the melt flow rate MFR 5/190° C. of the first fraction is higher than the melt flow rate MFR 5/190° C. of the second fraction; the flow rate ratio FRR 21/5 of the polyethylene composition, defined as the ratio of melt flow rate MFR 21.6/190° C. to melt flow rate MFR 5/190° C. , is within the range of 20-24; and the melt flow rate MFR 5/190° C. of the polyethylene composition is within the range of 0.5-1.1 g/10 min; wherein the composition has a shear thinning index (SHI), defined as the ratio of viscosity at a shear stress of 2.7 kPa to viscosity at a shear stress of 210 kPa, within the range of 15-40; and wherein the base resin has a density of from 0.945 to 0.952 g/cm 3 .