Patent ID: 8389632

Claim:
A composition comprising a blend of an irradiated first propylene polymer comprising a non-phenolic stabilizer and a non-irradiated second propylene polymer, wherein the irradiation of the first propylene polymer was conducted in a reduced oxygen environment, and wherein the second propylene polymer is selected from: (e) an olefin polymer composition comprising: (i) about 10 parts to about 60 parts by weight of a crystalline propylene homopolymer having xylene insolubles of at least 80%, or a crystalline copolymer selected from the group consisting of (a) propylene and ethylene, (b) propylene, ethylene and a C 4 -C 10 α-olefin, and (c) propylene and a C 4 -C 10 α-olefin, the crystalline copolymer comprising a propylene content of more than about 85% by weight, and xylene insolubles greater than about 60%; (ii) about 3 parts to about 25 parts by weight of a copolymer of ethylene and propylene, or ethylene and a C 4 -C 10 α-olefin, where the copolymer is insoluble in xylene at ambient temperature; and (iii) about 10 parts to about 80 parts by weight of an elastomeric copolymer selected from the group consisting of (a) ethylene and propylene, (b) ethylene, propylene, and a C 4 -C 10 α-olefin, and (c) ethylene and a C 4 -C 10 α-olefin, the elastomeric copolymer optionally comprising about 0.5% to about 10% by weight of a diene, and comprising less than 70% by weight of ethylene, wherein the elastomeric copolymer is soluble in xylene at ambient temperature and comprises an intrinsic viscosity of about 1.5 to about 4.0 dl/g; wherein (ii) and (iii) total about 50% to about 90% by weight based on a total weight of the olefin polymer composition, and (ii)/(iii) comprise a weight ratio of less than 0.4; the olefin polymer composition being prepared by polymerization in at least two stages, (f) a thermoplastic olefin comprising: (i) about 10% to about 60% by weight of a propylene homopolymer having xylene insolubles of at least 80%, or a crystalline copolymer selected from the group consisting of (a) ethylene and propylene, (b) ethylene, propylene and a C 4 -C 10 α-olefin, and (c) ethylene and a C 4 -C 10 α-olefin, the crystalline copolymer comprising a propylene content greater than 85% by weight and xylene insolubles greater than 60%; (ii) about 20% to about 60% by weight of an amorphous copolymer selected from the group consisting of (a) ethylene and propylene, (b) ethylene, propylene, and a C 4 -C 10 α-olefin, and (c) ethylene and an α-olefin, the amorphous copolymer comprising less than 70% by weight of ethylene and is soluble in xylene at ambient temperature, the amorphous copolymer optionally comprising about 0.5% to about 10% by weight of a diene; and (iii) about 3% to about 40% by weight of a copolymer of ethylene and propylene or a copolymer of ethylene and an α-olefin, wherein the copolymer is insoluble in xylene at ambient temperature; or (g) mixtures thereof, and wherein additives in the non-irradiated propylene polymer are present in the composition at no more than 0.22 pph.