Patent ID: 8445599

Claim:
A process for producing polyethylene compositions comprising producing polyethylene resins in a cascaded multi-stage reaction in which the reaction steps are performed in at least two slurry phase polymerization reactors (A) and (B) and at least one gas phase polymerization reactor (C) which are arranged in series in any order wherein in reactor (A) a low molecular weight ethylene homo- or copolymer fraction having a MFR 2 of 100 to 2000 g/10 min, in reactor (B) a low molecular weight ethylene homo- or copolymer fraction having an MFR 2 of 100 to 2000 g/10 min, and in reactor (C) a high molecular weight ethylene copolymer fraction are produced, and further comprising a compounding step after polymerisation, wherein the final polyethylene composition has a MFR 21 of 3 to 50 g/10 min, the melt flow rates being determined according to ISO 1133.