| 摘要 |
PCT No. PCT/FR96/00455 Sec. 371 Date Sep. 29, 1997 Sec. 102(e) Date Sep. 29, 1997 PCT Filed Mar. 27, 1996 PCT Pub. No. WO96/30914 PCT Pub. Date Oct. 3, 1996The 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. The 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 10-9S.cm-1. This object is achieved with the aid of a process comprising the following stages: dissolving 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, evaporating the solvent to obtain insulating polymer granules covered with a conductive polymer, drying said granules, hot mixing or extruding said granules to form a homogeneous mixture, which can be restored to granule form.
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