Heterophasic polypropylene with high flowability and excellent low temperature impact properties

摘要

The present invention relates to a heterophasic polypropylene resin comprisinga propylene homo- or copolymer matrix (A) and an ethylene-propylene rubber phase (B) dispersed within the matrix,wherein the heterophasic polypropylene resin hasa fraction insoluble in p-xylene at 25°C (XCU) with an intrinsic viscosity of 1.5 dl/g or less, determined according to DIN EN ISO 1628-1 and -3, anda fraction soluble in p-xylene at 25°C (XCS) with an amount of propylene monomer units of 50 to 75 mol%,and a MFR (2.16 kg, 230°C) of more than 100 g/10 min, determined according to ISO 1133;the heterophasic polypropylene resin obtainable in the presence of a catalyst system comprising an asymmetric catalyst wherein the catalyst system has a porosity of less than 1.40 ml/g.