Patent ID: 8378028

Claim:
A polyolefin composition, comprising in percent by weight: 1) 75-85% of a copolymer of propylene, said copolymer containing up to 15% by weight, of ethylene and/or C 4 -C 10 α-olefin(s) and having a fraction soluble in xylene at room temperature lower than 6% by weight, and 2) 15-25% of a copolymer of ethylene with at least one C 4 -C 10 α-olefin(s) containing from 10 to 25% by weight of said C 4 -C 10 α-olefin(s); said composition having a value of MFR, measured at 230° C., 2.16 kg, of less than 2.5 g/10 min, a total content of ethylene of from 14 to 22% by weight, a total content of C 4 -C 10 α-olefin(s) of less than 4.5% by weight, a ratio of the total content of ethylene to the total content of C 4 -C 10 α-olefin(s) of at least 4, a value of the intrinsic viscosity of the total fraction soluble in xylene at room temperature of at most 1.5 dl/g, and a ratio of the amount of component 2) and the amount of C 4 -C 10 α-olefin(s) in component 2) equal to or higher than 0.80.