Patent ID: 7592396

Claim:
A polyolefin composition comprising: (A) from 15 to 40% by weight of a crystalline propylene copolymer comprising at least 90% by weight of propylene and at least one alpha-olefin of formula H 2 C═CHR 1 , where R 1 is H or a C 2-8 linear or branched alkyl, the crystalline propylene copolymer comprising a solubility in xylene at room temperature lower than 15% by weight; (B) from 60 to 85% by weight of an elastomeric fraction comprising: (1) a propylene and ethylene copolymer comprising from 20 to 35% by weight of ethylene, the propylene and ethylene copolymer comprising a solubility in xylene at room temperature greater than 45% by weight, and a xylene soluble fraction of the propylene and ethylene copolymer comprising an intrinsic viscosity in tetrahydronaphthalene at 135° C. ranging from 1.0 to 3.0 dl/g; and (2) an ethylene copolymer comprising 15 to 40% by weight of at least one alpha-olefin of formula H 2 C═CHR 2 , where R 2 is C 2-8 linear or branched alkyl, the ethylene copolymer comprising a solubility in xylene at room temperature greater than 35% by weight, and a xylene soluble fraction of the ethylene copolymer comprising an intrinsic viscosity in tetrahydronaphthalene at 135° C. ranging from 1.0 to 3.0 dl/g; wherein a weight ratio of B(1) to B(2) ranges from 1:5 to 5:1.