APPLICATION OF MULTIPLE COATINGS TO A FILM BY COATING WITH POLYMERIC SOLUTION, REMOVAL OF SOLVENT AND APPLICATION OF POLYMERIC BARRIER LAYER FOLLOWED BY A FURTHER COATING WITH POLYMERIC SOLUTION AND REMOVAL OF SOLVENT

摘要

A film comprising alternating layers of polyvinylidene chloride resin and a solvent barrier such as polyvinyl alcohol provides superior barrier properties. Barrier and mechanical properties are enhanced when formulation additives are present at customary levels only in the outermost layers.