Patent ID: 7709577

Claim:
A process for producing a polymer blend comprising a thermoplastic first polymer having a crystallinity of at least 30% and a second polymer having a crystallinity of less than 20% and being at least partially cross-linked, the process comprising: (a) polymerizing at least one first monomer in a first slurry phase reaction zone in the presence of a supported first catalyst under conditions to produce said thermoplastic first polymer, said first catalyst comprising a Ziegler-Natta catalyst; and (b) polymerizing at least one second monomer different from said first monomer and at least one polyene in a second solution phase reaction zone in the presence of said thermoplastic first polymer under conditions sufficient to produce an at least partially cross-linked said second polymer having at least a fraction which is insoluble in xylene in the form of finely dispersed particles embedded within the thermoplastic first polymer.