The present invention relates to a polyester matrix powder comprising a polybutylene terephthalate, a homogeneously dispersed carbon nanotube powder, a dispersant and a chain extender to a conductive masterbatch with homogeneous and smooth surface to a process for the preparation of the conductive masterbatch to a conductive monofilament prepared from the conductive masterbatch to a process for the preparation of the conductive monofilament and to a fabric article prepared from the monofilament. The present invention is characterized in the preparation of carbon nanotube-containing fiber materials with higher conductivity and the improvement of the spinning property of the conductive masterbatches to avoid blocking and yarn breakage during the spinning process.
