Patent ID: 6998157

Claim:
A thermoformable film comprising a composite structure comprising at least three layers firmly adhered to one another, a top and bottom layer and an inner layer; wherein the top and bottom layer of the composite structure comprise a film layer of ethylene-vinyl acetate copolymer consisting essentially of 1 to 25% by weight, based on the weight of the copolymer, of a polymerized vinyl acetate and 75 to 99% by weight, based on the weight of the copolymer, of polymerized ethylene and the inner layer of the composite structure comprises a film of a polymer blend consisting essentially of (a) 40 to 95% by weight, based on the weight of the polymer blend, of an ethylene based copolymer having a melt index of 0.5 to 200 g/10 minutes determined according to ASTM D 1238 Condition E, said ethylene based copolymer consisting essentially of repeating polymerized units of (1) 75 to 93% by weight, based on the weight of the copolymer, of ethylene; and (2) 7 to 25% by weight, based on the weight of the copolymer, of acrylic acid or methacrylic acid; and wherein 30 to 70% of the acid groups of the acrylic acid or methacrylic acid of the ethylene based copolymer are neutralized with metal ion selected from the group consisting of zinc, magnesium, sodium and lithium; and (b) 5 to 60% by weight, based on the weight of the polymer blend, of a metallocene catalyzed linear polyethylene.