Patent ID: 7795352

Claim:
A polypropylene composition comprising (percent by weight): (a) 50-77% of a crystalline propylene polymer homopolymer having an amount of isotactic pentads (mmmm), measured by 13 C-MNR on the fraction insoluble in xylene at 25° C., higher than 97.5 molar % and a polydispersity index ranging from 4 to 10; (b) 13-28% of an elastomeric copolymer of ethylene and propylene, the copolymer having an amount of recurring units deriving from ethylene ranging from 30 to 70% and being partially soluble in xylene at ambient temperature, the polymer fraction soluble in xylene at ambient temperature having an intrinsic viscosity value ranging from 2 to 4 dl/g; and (c) 10-22% of a polyethylene homopolymer having an intrinsic viscosity value ranging from 1 to 3 dl/g; wherein in said composition, the sum of component (b) and component (c) is present in an amount of at least 25 wt % and the weight ratio between copolymer (b) and polyethylene (c) is at least 1.2.