H. Hayashida et al., NEW PROCESS FOR PRODUCING AN EXTRUSION LAMINATED FILM WITHOUT ANY CHEMICAL PRIMER - NON ANCHOR COATING EXTRUSION LAMINATING PROCESS, Polymer engineering and science, 38(10), 1998, pp. 1633-1639
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.