Patent ID: 8383246

Claim:
A film comprising at least one skin layer, at least one core layer, and at least one tie layer between each, wherein, independently, (a) at least one skin layer comprises a solvent sealable material; (b) at least one core layer consisting essentially of (i) from 0 to 30 wt %, by weight of the core layer, of polypropylene, and (ii) from 70 to 100 wt %, by weight of the core layer, of a random propylene-α-olefin copolymer having within the range of from 1 to 10 wt % α-olefins, by weight of the copolymer, the α-olefin selected from the group consisting of ethylene and C 4 to C 12 α-olefins, and having an MWD within the range of from 1.2 to 4.5; (iii) and optionally up to 3 wt %, by weight of the core layer, of additives; wherein the TD shrinkage is greater than 40% at 121° C., while the MD shrinkage is less than 15% at the same temperature; a TD Tensile Strength (ASTM 882) of from 100 MPa to an upper limit of 400 MPa when stretched at a temperature of from 110° C. to 170° C., and a MD Tensile Strength of from 20 MPa to an upper limit of 70 MPa; wherein the core layer comprises greater than 70 wt % of the total weight of the film (all layers combined); and wherein when the skin layer(s) comprise a styrenic copolymer, the tie layer(s) consist of a styrenic copolymer; and wherein when the skin layer comprises a polyester copolymer, the tie layer consists of a polar-modified polyolefin.