In the last ten years carbon nanotube composites are in the focus of the researchers of polymer blends. Different composition of carbon nanotubes and polymers were produced by a special mixing unit called Infinitely Variable Dynamic Shear Mixer (IDMX). In the experiments polypropylene and polycarbonate polymers were used as matrix materials. Nanotube masterbatches were used to prepare different compositions. Concentration series were manufactured by the dynamic mixer. The prepared materials were characterised by scanning electron microscopy. Mechanical, electrical and burning properties of the materials were also determined. Thermal properties were examined by DSC.