Patent ID: 7951461

Claim:
A multi-layer, gas-barrier, biaxially oriented and heat-shrinkable film comprising: a) a first outer heat-sealable layer; b) an inner gas-barrier layer; and c) a second outer abuse resistant layer; said film being characterized in that it contains at least 28%, by weight of the film, of polystyrene polymer, wherein the film comprises one or more inner layers positioned between the inner gas-barrier layer and the second outer abuse resistant layer; wherein the polystyrene polymer is present in i) the second outer abuse resistant layer, or ii) at least one inner layer positioned between the inner gas-barrier layer and the second outer abuse resistant layer, or iii) both the second outer abuse resistant layer and at least one inner layer positioned between the inner gas-barrier layer and the second outer abuse resistant layer; wherein at least 50 wt. % of the total amount of polystyrene polymer in the film is in the form of a styrene-butadiene copolymer.