FIELD: chemistry.
SUBSTANCE: described is a heterophase polypropylene polymer composition, the weight composition of which includes: (A) 45-70% propylene homo- or copolymer matrix with melt flow rate according to standard ISO 1133 (230°C, with nominal load of 2.16 kg) of ≥80 g/10 min, and (B) 25-40% elastomeric copolymer of propylene and ethylene with characteristic viscosity IV (standard ISO 1628, with decalin as solvent) of ≥3.3 dl/g, and weight content of ethylene of 20-50%, (C) 0-15% elastomeric random copolymer based on ethylene and alpha-olefin (D) 3-25% inorganic filler. The heterophase polypropylene composition has total melt flow rate (230°C/2.16 kg) according to standard ISO 1133, greater than or equal to 5 g/10 min, Charpy notch impact strength in accordance with standard ISO 179/leA at temperature of +23°C, greater than or equal to 15.0 kJ/m2, in accordance with the preferred exemplary embodiment of the present invention which is greater than or equal to 25.0 kJ/m2, minimum Charpy notch impact strength according to standard ISO 179/leA at temperature of 20°C, greater than or equal to 7.0 kJ/m2, in accordance with the preferred exemplary embodiment of the present invention which is greater than or equal to 10.0 kJ/m2, and modulus of elasticity in tension according to standard ISO 527-3, which is greater than or equal to 1200 MPa. Also described is a method of producing a heterophase polypropylene polymer composition, use of the composition and an article made by pressure casting.
EFFECT: obtaining large articles made by pressure casting from a heterophase polypropylene composition, which are not susceptible to emergence of flow traces and for which is typical an improved balance between impact strength and hardness.
12 cl, 1 dwg, 6 tbl, 5 ex
