a delamination resistant multi - layer film comprises a core layer of vinyl alcohol polymers or copolymers such as polyvinyl alcohol or ethylene vinyl alcohol . adhered to the core layer are one or more layers of a polyolefin blended with a chemically modified polyolefin having functional groups added to the basic polymer such that strong adhesion to the core layer is obtained . the core layer provides an excellent oxygen barrier , while the adjacent layers protect the core layer from degradation by exposure to water vapor . additional layers of various polymer materials may be provided over the layers of modified polyolefin . the film can be prepared by coextrusion techniques .