FIELD: chemistry.
SUBSTANCE: composition contains a random propylene copolymer (A) with, at least, one comonomer selected from alpha-olefins with 2 or 4 to 8 carbon atoms and a nucleating agent (B). The random propylene copolymer (A) contains, at least, a low molecular weight propylene copolymer (low molecular weight fraction) and a high molecular weight random propylene copolymer (high molecular weight fraction). In addition, the polypropylene composition has a polydispersity coefficient (PI) in the range of 2.0 to 7.0, a melt flow rate of MFR2 (2.16 kg, 230°C) in the range of 0.05 to 1.0 g/10 min and Charpy impact strength for a notched specimen at 0°C, which is, at least, 4.0 kJ/m2.
EFFECT: composition has a favorable balance of properties with respect to mechanical properties, including the properties of impact resistance, stiffness/flexibility and workability.
16 cl, 3 tbl
