Patent ID: 8609228

Claim:
A multilayer biaxially oriented polypropylene film comprising: a. an outer layer comprising a first polymer which is a homopolymer polypropylene resin having a melting point of at least 155° C.; b. a core layer, with a melting point greater than 150° C., comprising a blend comprising a second polymer which is a polypropylene homopolymer having a melting point of at least 155° C. and a third polymer having a melting point no greater than 145° C., wherein the second polymer comprises from 20% to 80% by weight of the core layer while the third polymer comprises from 80% to 20% by weight of the core layer, a thickness of the core layer being the same as or smaller than a thickness of the outer layer; and c. a sealant layer comprising a fourth polymer having a melting point no greater than 145° C.