Oxygen Barrier Primer Provides Adhesion Under Humid Conditions

Presented by Jessica Bodine, Mica Corporation

Recently an oxygen barrier primer was developed to provide adhesion of base films to polymeric substrates for extrusion coating. The original primer could be run on conventional coating equipment and provided excellent adhesion and oxygen barrier for dry food applications. However, under stringent humid environmental conditions, this primer lost bond strength. An improved primer has been developed that maintains its bond strength under humid conditions. This improvement in humidity resistance allows for the primer to be used in broader coating applications beyond extrusion coating. This paper will present bond strength data comparing the two primers and a discussion as to how the results indicate that this new primer may by suitable for a wider variety of food packaging processes and applications.