Patent ID: 7649046

Claim:
Polypropylene composition comprising A) 70-99 parts by weight of a heterophasic propylene copolymer comprising 60-90 wt % of a matrix phase comprising a propylene homopolymer having an isotacticity IRτ≧0.970, and 10-40 wt % of an elastomeric copolymer comprising 20-55 wt % of ethylene and 80-45 wt % of one or more C 3 -C 8 α-olefins, B) 1-30 parts by weight of a further elastomeric copolymer comprising an ethylene-α-olefin elastomer, with more than 65 wt % of ethylene and up to 35 wt % of one or more C 3 -C 8 α-olefins, where a disperse phase is comprised of the elastomeric copolymers, and C) 3-25 parts by weight of an inorganic filler, the polypropylene composition having a Charpy notched impact strength according to ISO 179/1eA at +23° C. of ≧55.0 kJ/m 2 , a Charpy notched impact strength according to ISO 179/1eA at −20° C. of ≧7.0 kJ/m 2 , a tensile modulus according to ISO 527-3 of ≧1200 Mpa elasticity (elongation at break) according to ISO 527-3 of ≧80% and an average failure length (AFL), which is determined by injection moulding the composition into a test specimen having the dimensions of 150×80×2 mm, creating surface defects by directing a water jet (76 bar; 60° C., flat spray nozzle 1/4 PMEG 2506) from a distance of 8 cm (from nozzle to specimen surface) at the specimen surface at three different locations at a distance of 6 cm from each location and for 60 sec each, measuring the length of each surface defect and calculating the average value of the three locations, of ≦10 mm.