Patent ID: 8436100

Claim:
A homogeneous polymer blend having one glass transition temperature indicated on a dynamic mechanical thermal analyzer trace of tan δ versus temperature comprising: (a) a thermoplastic first polymer having a crystallinity of at least 30% and a melting temperature at or above 100° C., wherein said thermoplastic first polymer is a co-polymer of propylene and from 0 to about 5% of alpha-olefin comonomers, by weight of said thermoplastic first polymer; and (b) a second polymer different from said thermoplastic first polymer and having a crystallinity less than that of said thermoplastic first polymer, wherein said second polymer being polymerized and at least partially cross-linked in the presence of said thermoplastic first polymer and at least one polyene having at least two polymerizable unsaturated groups to form said second polymer which is a polymer of propylene, 2 to 15 weight % of one or more C 2 and/or C 4 to C 10 alpha-olefins comonomers and 0.01 to 5 wt % polyene, by weight of said second polymer.