Patent ID: 7147930

Claim:
A coextruded heat-shrinkable, biaxially-oriented multilayered packaging film comprising; (a) a first layer, a second polymer layer, a third polymer layer, and a fourth polymer layer; (b) wherein said first polymer layer comprises a first ethylene/α-olefin copolymer having an α-olefin comprising 4–8 pendant carbon atoms, wherein said first ethylene/α-olefin copolymer has: (i) a melting point of less than 105° C. as measured in accordance with ASTM D-3418; (ii) a first ethylene/α-olefin copolymer having a molecular weight distribution M w /M n of from 1.9 to 2.7 as measured in accordance with ASTM D-3593-80; (iii) a melt index of from 6.5–34 g/10 min. at 190° C. as measured in accordance with ASTM D-1238 Condition 190° C./2.16 kg; (c) wherein said first ethylene/α-olefin copolymer is present in said first layer is an amount of from 50–100%, based on the total weight of said first layer; (d) wherein said second layer comprises a second ethylene/α-olefin copolymer having a melt index of from 0.85–6.0 g/10 min as measured in accordance with ASTM D-1238, Condition 190° C./2.16 kg; (e) wherein A is the cumulative total weight percentage of said first ethylene/α-olefin copolymer in all layers of said film and B is the cumulative total weight percentage of said second ethylene/α-olefin copolymer in all layers of said film, said weight percentages being based on the total film weight, such that the relative amounts A and B satisfy the relationship 2A/B≦1; and (f) wherein said packaging film has an unrestrained linear thermal shrinkage in the machine direction or the transverse direction of between 20–100% at 85° C. as measured in accordance with ASTM D-2732-96.