Reactor thermoplastic polyolefin elastomer composition

A thermoplastic elastomer composition comprising about 100 parts by weight of component (A) and about 20 to about 100 parts by weight of component (B);

• a) wherein component (A) is a polypropylene resin consisting essentially of:
• about 60 to about 90% by weight of component (i) and about 40 to about 10% by weight of component (ii), the total content of components (i) and (ii) is 100% by weight of component (A);
• wherein component (i) consists essentially of one or more of the following:
• a copolymer of propylene and at least one monomer selected from the monomer group consisting of ethylene and an α-olefin having 4 or more carbon atoms, the copolymer of propylene comprising about 90% by weight or more of propylene units,
• a propylene homopolymer,
• and a mixture thereof;
• and
• wherein component (ii) consists essentially of an ethylene-α-olefin copolymer consisting of about 20 to about 50% by weight of ethylene units, and about 80 to about 50% by weight α-olefin having 3 or more carbon atoms, the total content of ethylene units and α-olefin is 100% by weight of component (ii);
• and
• b) wherein component (B) is an ethylene-α-olefin elastomer consisting essentially of about 60 to about 85% by weight of ethylene units, and about 40 to about 15% by weight of α-olefin units, the total content ethylene units and α-olefin units is 100% by weight of component (B), and wherein component (B) has a Mooney stress relaxation area of from about 180 to about 300.