Patent ID: 8445619
Filing Date: 2013-05-21
Classification: C08F,Y10T

Abstract:
1. Process for making a film or a pipe, comprising: compounding an uncompounded polyolefin powder having a particle size distribution such that D95 is less than 355 μm and (D90−D10)/D50 is less than 1.2, where D95, D90, D50 and D10 are defined such that 95 wt %, 90 wt %, 50 wt % or 10 wt % of polymer particles have a diameter of less than D95, D90, D50 and D10 respectively, to form pellets; and then forming the pellets into a film or a pipe, wherein the compounding to form pellets utilises a specific energy of no more than 0.40 kWh/kg, and additionally or alternatively the residence time in a pelletisation extruder is no more than 45 seconds, and wherein the uncompounded polyolefin powder is a multimodal ethylene polymer having a density greater than 940 kg/m