Patent ID: 8105680

Claim:
A heat sealable, multi-layer film structure for multi-color printing or lamination processes, comprising: (a) a core layer comprising a polypropylene homopolymer and essentially no migratory slip agents; (b) a functional layer on a side of the core layer, wherein the functional layer is a printable layer or a laminatable layer consisting of ethylene-propylene copolymer or high density polyethylene; and (c) a heat sealable skin layer consisting of a random ethylene-propylene copolymer on a side of the core layer opposite the functional layer, the heat sealable skin layer comprising the random ethylene-propylene copolymer and a slip system, wherein: (i) the random ethylene-propylene copolymer comprises from 60 wt % to 80 wt % of propylene derived units, and (ii) the slip system comprises from 0.05 to 0.5 wt % of an anti-block agent and: (A) a silicone gum comprising less than or equal to 1500 ppmw of the sealant skin layer, (B) a wax which comprises less than or equal to 7 wt % of the sealant skin layer, or (C) a combination of the silicone gum and the wax, wherein the silicone gum comprises less than or equal to 1500 ppmw of the sealant skin layer and the wax comprises less than or equal to 10 wt % of the sealant skin layer; wherein essentially none of the slip system is transferred to the functional layer during multi-layer film processing; adhesively laminated to a substrate with an adhesive layer, where the adhesive layer is disposed on a side of the functional layer opposite the core layer; and wherein a bond between the functional layer and the adhesive layer has a bond strength of at least 50 g/in or more.