Invisible set-off of UV-printing inks onto polyolefins
Set-off of printing ink components from the ink to the food contact layer needs to be considered for food regulatory evaluations. In an experimental approach, the set-off of photoinitiators from three ink systems onto polyethylene and polypropylene films was investigated. “Monomeric” photoinitiators and acrylates reached their partition equilibria within short term whereas “polymeric” photoinitiators did migrate only slowly. A conservative estimate of partition coefficients was proposed in order to predict set-off from UV-printing inks onto polyolefins.
Keywords: Migration, Photoinitiators, Printing ink, Modelling, Polyolefins
Schlagworte: Migration, Photoinitiatoren, Druckfarben, Modellierung, Polyolefine