Process for the production of improved dielectric strength materials and the use of materials obtained by this process in the manufacture of power transmission cables

摘要

The invention relates to a process for the production of a material having an improved dielectric strength and use of said material in the manufacture of power transmission cables.PPThe object of the invention is to obtain mixtures remaining macroscopically very insulating and which locally, at a scale below 1 micron, can have conductivity levels of approximately 10.sup.-9 S.cm.sup.-1.P PThis object is achieved with the aid of a process comprising the following stages:PPdissolving at least one conductive polymer in an organic solvent, to form an impregnation solution and impregnating granules constituted by an insulating polymer or a mixture of insulating polymers, PPevaporating the solvent to obtain insulating polymer granules covered with a conductive polymer, PPdrying said granules,PPhot mixing or extruding said granules to form a homogeneous mixture, which can be restored to granule form.