A process for treating an initial polyethylene-containing material to produce a polyethylene composition, said process comprising: providing a twin-screw extruder with a thermal regulating device; providing an initial polyethylene-containing material comprising at least 50 wt% of polyethylene based on the total weight of said initial polyethylene-containing material; extruding said initial polyethylene-containing material to obtain a polyethylene composition, wherein the extrusion is carried out with a residence time of less than 20 minutes; and collecting the polyethylene composition; wherein the extrusion comprises heat-treating said initial polyethylene-containing material by self-heating at a temperature of at least 300°C in one or more thermal zones of said extruder, such that the maximum barrel temperature in at least one thermal zone of said extruder ranges from 300 to 460°C.
Country Code: FR
Application Number: CN202380021342.9
