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Commercially available poly(propylene)(PP) (MOSTEN, MFR ¼ 4 g/10 min) supplied by a Czech company Chemopetrol Litvínov and precipitated calcium carbonate (CaCO 3 ) was used for this study. The CaCO 3 particles were coated with surface agent improving their dispersion.The effect of the PP structure, the volume content and surface coating of particles on the decisive mechanical properties (dynamic modulus of elasticity and dynamic fracture toughness) was evaluated by means of dynamic mechanical thermal analysis (DMTA) and instrumented Charpy tester. The dispersion of the filler particles was qualitatively estimated by scanning electron microscopy (SEM). The change of solid phase PP ratio was evaluated utilizing differential scanning calorimetry (DSC) and nuclear magnetic resonance (pulsed 1 H-NMR).The composites in the study demonstrated the enhanced toughness with respect to the native PP. The correlation between the structure and fracture parameters was confirmed.