The present invention relates to the field of thermosetting or thermoset resins/polymers used mainly as composite materials, coatings or adhesives. The invention relates more particularly to the use of nanofillers of carbon origin chosen from carbon nanotubes, carbon black, carbon nanofibres, graphenes, or a mixture thereof in any proportion, preferably carbon nanotubes, in the curing system of thermosetting resins in the form of a masterbatch, and also the preparation of said masterbatch and to the various uses thereof for preparing thermoset composite materials that enable the manufacture of 3-dimensional structures compatible with the manufacture of parts in the mechanical or aeronautical fields, the nautical field, transport by rail, sport or aerospace.
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