Patent ID: 7579407
Filing Date: 2009-08-25
Classification: B32B,C08J,C08L,C09K

Abstract:
1. A thermoplastic olefin composition, comprising: (a) at least 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 60 percent by weight units derived from propylene; (2) at least 6 percent by weight units derived from an alpha olefin; (3) a molecular weight distribution less than 3.5; (4) a broad composition distribution; (5) a heat of fusion of less than 40 Joules/gram; and (6) optionally, a glass transition temperature (Tgp) less than −10° C.; and (b) at least 20 percent by weight of a propylene impact copolymer based on the total weight of polymers in the composition, the propylene impact copolymer comprised of: (1) a polypropylene matrix phase having a heat of fusion greater than the heat of fusion exhibited by the propylene-alpha olefin copolymer; and (2) an elastomer phase, wherein the elastomer phase is at least 10 percent by weight of the propylene impact copolymer.