Patent ID: 7569175

Claim:
A process for the preparation of an at least 8L volume bimodal HDPE container having an ESCR F 50 of at least 1000 hours which process comprises blow moulding a bimodal HDPE, wherein said bimodal HDPE consists of, as the polymer component of the container, an ethylene homopolymer having a weight average molecular weight of 40,000 to 100,000 D and ethylene copolymer and has the following characteristics: a density of 940 to 960 kg/m 3 ; a weight average molecular weight of 200000 to 450000 D; a number average molecular weight of 7000 to 18000 D; a molecular weight distribution of 25 to 50; MFR 21 of 3 to 8 g/10 minutes; tensile modulus of at least 900 MPa; and a comonomer content of 1 to 2 wt %.