Heterophasic propylene copolymers

A film comprising:

• a polypropylene composition comprising
• A) from 50 wt % to 90 wt %;
• of a propylene homopolymer having a fraction insoluble in xylene at 25° C., higher than 90%;
• and a MFR L (Melt Flow Rate according to ISO 1133, condition L, at 230° C. and 2.16 kg load) from 0.5 to 200 g/10 min;
• and
• B) from 10 wt % to 50 wt %;
• of a copolymer of propylene and ethylene having from 30.0 wt % to 70.0 wt %, of ethylene derived units, based upon the total weight of the copolymer;
• wherein
• the sum of the amount of component A) and B) being 100;
• the polypropylene composition having:
• i) an intrinsic viscosity of the fraction soluble in xylene at 25° C. between 2.2 and 4.0 dl/g;
• ii) a MFR L (Melt Flow Rate according to ISO 1133, condition L, at 230° C. and 2.16 kg load) from 0.5 to 50 g/10 min;
• and
• iii) a xylene soluble fraction ranging from 20 wt % to 50 wt % based upon the total weight of the propylene composition;
• and
• the polypropylene composition being obtained by a polymerization process comprising the steps of
• step a) polymerizing propylene to obtain component A) in the presence of a catalyst comprising the product of a reaction between:
• a) a solid catalyst component comprising Ti, Mg, Cl, and an internal electron donor compound containing from 0.1 to 50% wt of Bi with respect to the total weight of the solid catalyst component;
• b) an alkylaluminum compound and,
• c) an electron-donor compound (external donor);
• and
• step b) polymerizing propylene and ethylene to obtain component B) in the presence of the polymerization product of step a).