NEW PROCESS FOR PRODUCING AN EXTRUSION LAMINATED FILM WITHOUT ANY CHEMICAL PRIMER - NON ANCHOR COATING EXTRUSION LAMINATING PROCESS

A new process, the Non Anchor Coating Extrusion Laminating Process for producing an extrusion laminated film without any chemical primer, wa s investigated. Good adhesive properties were obtained by combining an ozone treatment of a molten polyethylene (LDPE) web and an activation treatment of the polyamide (ONy) substrate film. The adhesion mechani sm induced by the new process was studied by FT-IR, ESCA and extractio n of unreacted polyamide from the laminated samples. The peel strength between the ONy and LDPE laminated films produced with this process w as greater than that for laminated film made with a conventional lamin ation process using anchor coating agents. A model of the adhesive mec hanism is proposed. Hydrogen and covalent bonds through oxygenated fun ctional groups are responsible for the enhanced adhesion.