Patent ID: 7019078

Claim:
A polyolefin composition comprising: (A) 20 to 50 parts by weight of a crystalline propylene polymer having an isotacticity index greater than 80, selected from the group consisting of polypropylene homopolymer and propylene copolymers containing 0.5 to 15 mol % of ethylene and/or an α-olefin having 4 to 10 carbon atoms, the propylene polymer having a molecular weight distribution (MWD) greater than 3.5; and (B) 50 to 80 parts by weight of an elastomeric ethylene copolymer with olefins CH 2 ═CHR, in which R is an alkyl group having 1 to 10 carbon atoms, and, optionally, containing minor proportions of units derived from a polyene, the copolymer containing 40 to 70% by weight of units derived from ethylene and 30 to 60% by weight of units derived from the α-olefin, and having the following characteristics: (a) a molecular weight distribution lower than 3.5, (b) a crystallinity content, expressed as the enthalpy of fusion, lower than 20 J/g, and (c) a content of 2-1 regioinvertions of the α-olefins units of lower than 5%.