Patent ID: 7588706

Claim:
A method of improving hot tack in a multi-layer film, the method comprising: selecting a first PE comprising at least one of mPE, LDPE or LLDPE to form a first outer layer; selecting a blend comprising from about 95 weight % to about 60 weight % of a mPE and from about 5 weight % to about 40 weight % of a PP to form an inner layer, wherein the weight % is based on the total weight of the mPE and the PP in the blend; and selecting a second PE comprising at least one of mPE, LDPE or LLDPE to form a second outer layer; and coextruding the first PE, the blend and the second PE to form the multi-layer film comprising the first outer layer, the inner layer and the second outer layer, respectively; wherein the inner layer has a component having a final melting point at least about 15° C. higher than a melting point of at least one component of the first outer layer or the second outer layer; and wherein the multi-layer film has a maximum hot tack at least about 25% greater than a multi-layer film with 0-weight % of the PP in the inner layer.