A new line of EVA copolymers designed for use as adhesive tie layers is said to offer advantages over conventional EVAs in specialized coextrusion applications such as food and beverage packaging. Levamelt copolymers from Lanxess Corp., Pittsburgh, contain 40% to 80% vinyl acetate, compared with less than 40% VA levels in typical EVA copolymers used as adhesive tie layers. Such high VA content is said to improve both processability and the quality of multilayer film packaging. These EVAs can be used in cast or blown films and comply with FDA regulations for adhesives, polymeric coatings, and closures with sealing gaskets.
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