Patent ID: 7459500

Claim:
A thermoplastic olefin composition, comprising: (a) at least about 40 percent by weight of a propylene-alpha olefin copolymer based on the total weight of polymers in the composition, the propylene-alpha olefin copolymer forming a continuous phase of the composition and the propylene-alpha olefin copolymer having: (1) at least about 60 percent by weight units derived from propylene; (2) at least about 5 percent by weight units derived from an alpha olefin; (3) a molecular weight distribution less than about 3.5; (4) a broad composition distribution; (5) a heat of fusion of less than about 40 Joules/gram; and (6) optionally, a glass transition temperature (Tgp) less than about −10° C.; (b) at least about 20 percent by weight of a polypropylene based on the total weight of polymers in the composition, the polypropylene having: (1) at least about 93 percent by weight units derived from propylene; (2) a heat of fusion greater than the heat of fusion exhibited by the propylene-alpha olefin copolymer; and (3) a melting point T max of at least about 120° C.; and (c) at least about 10 percent by weight of an ethylene-alpha olefin elastomer based on the total weight of polymers in the composition.