Method for manufacturing an electrical cable having improved thermal conductivity

The invention relates to a process for manufacturing a cable comprising at least one electrically insulating layer obtained from a polymer composition comprising at least one polypropylene-based thermoplastic polymer material, at least one dielectric liquid, and at least one thermally conductive inorganic filler, said process involving the mixing of the thermally conductive inorganic filler with the dielectric liquid to form a filler-charged dielectric liquid prior to placing the dielectric liquid in contact with said thermoplastic polymer material.