The first polymer contains {HEAD ~ a polymer} having {TAIL ~ at least 70% α olefin units} and is characterized by a melting temperature lower than the melting temperature of the exterior surface portion of the core 
The first polymer contains { HEAD ~ a polymer } having { TAIL ~ at least 70 % α olefin units } and is characterized by a melting temperature lower than the melting temperature of the exterior surface portion of the core
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH