Patent ID: 8008400

Claim:
A masterbatch composition comprising (percent by weight): A) 50%-90% of a crystalline polypropylene component comprising: A I ) from 25% to 75% of a fraction having a melt flow rate MFR I of from 0.1 to 10 g/10 min.; and A II ) from 25% to 75% of a fraction having a melt flow rate value MFR II from 10 to 68 g/10 min.; wherein a ratio MFR II /MFR I is from 5 to 60, and the fractions A I ) and A II ) are independently selected from the group consisting of a propylene homopolymer, a random copolymer of propylene containing up to 3% of ethylene, and a random copolymer of propylene containing up to 6% of at least one C4-C10 α-olefin; and B) 10%-50% of a copolymer component comprising ethylene and at least one C 3 -C 10 α-olefin, the copolymer containing from 15% to 50% of ethylene, and optionally minor amounts of a diene; said masterbatch composition having an MFR and a value of the intrinsic viscosity [η] of a fraction soluble in xylene at room temperature (about 25° C.) of at least 3.5 dl/g.