Primerless Heat Seal Coatings for Film Substrates

摘要

Water based heat seal coatings based on acid copolymers are well known to the art. They are typically applied in two steps: first a primer, then the heat seal coating. The result is a coated film that offers good seal strength, hot tack, machinability and optical clarity. This paper presents a single pass, aqueous heat seal coating which exhibits excellent hot tack and a wider operating window as compared to conventional heat seal coatings and common extruded sealants.