Patent ID: 7951872

Claim:
A heterogeneous polymer blend comprising: (a) less than 20% by weight (based on the total heterogeneous polymer blend) of a dispersed phase comprising a thermoplastic first polymer having a crystallinity of at least 30%; and (b) a continuous phase, comprising an elastomeric second polymer different from said thermoplastic first polymer and a hybrid species, said hybrid species comprising a branch-block copolymer having an amorphous backbone and crystalline side chains originating from the first polymer, said elastomeric second polymer being produced from a plurality of comonomers comprising at least one C 3 to C 20 olefin and at least one polyene and having a crystallinity of less than 20% and having been polymerized and at least partially cross-linked at the same time in the presence of some or all of said thermoplastic first polymer such that at least 20% by weight of said continuous phase is insoluble in xylene and substantially free of curatives added to effect post-polymerization cross-linking.