Conventional multilayer coextrusion, lamination and biaxial stretching technology commonly employed to produce flexible and rigid packaging structures may be used to produce oriented, multilayer, multifunctional, transparent, high impact film/sheet structures using impact-resistant materials such as polycarbonate (PC), poly(methyl methacrylate) (PMMA), coextrudable adhesives such as thermoplastic polyurethane (TPU), and ionomers that exhibiting self-healing properties. In fabricating a complex multilayer structure, processing considerations including coextrusion conditions, coextrusion instability and orientation temperature incompatibility resulting from the diverse melt Theological and solid-state deformation properties of these resins must be addressed. The adhesion between involved materials has been studied to optimize the impact strength, transparency and chemical resistance. The progress and results of ongoing research and development efforts to produce oriented, multilayer high impact structures utilizing conventional cast film coextrusion will be reviewed.
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