Tie layer compositions and multilayer films incorporating the same

A multilayer film comprising at least five layers, wherein the at least 5 layers comprise:

• at least one polyolefin outer layer;
• at least one polystyrene outer layer;
• at least one core layer disposed between the polyolefin outer layer and the polystyrene outer layer, the core layer comprising a polar polymer;
• a first tie layer disposed between the polyolefin outer layer and the core layer;
• and
• a second tie layer disposed between the polystyrene outer layer and the core layer,
• wherein the first tie layer, the second tie layer, or both comprises a tie layer composition comprising
• functionalized polyethylene, styrene block copolymer, base polyethylene, and antioxidant co-stabilizers,
• wherein the antioxidant co-stabilizers comprise at least one oxygen scavenger comprising a phosphite, at least two peroxy free radical scavengers comprising sterically hindered phenolics, and at least one alkyl free radical scavenger comprising an acrylate, thereby demonstrating improved adhesion and viscosity control, and
• wherein the tie layer composition comprises from 3000 to 10,000 ppm of the antioxidant co-stabilizers including 1000 to 4300 ppm of the alkyl free radical scavenger.