Patent ID: 8747955

Claim:
A method of producing food packaging, the method comprising: coating at least part of a surface of the food packaging with at least one polyelectrolyte complex; wherein the at least one polyelectrolyte complex comprises at least one first polymer and at least one second polymer, the first polymer being an anionic polymer and the second polymer being a cationic polymer, wherein the polyelectrolyte complex is predominantly anionically charged, wherein the cationic polymer is at least one polymer comprising at least one unit selected from the group consisting of a vinylimidazolium unit, a polydiallyldimethylammonium halide, a vinylamine unit, an ethyleneimine unit, a dialklyaminoalkyl acrylate unit, a dialkylaminoalkyl methacrylate unit, a dialkylaminoalkylacrylamide unit, and a dialkylaminoalkylmethacrylamide unit, wherein the substrate of the food packaging material is paper or cardboard and wherein the packaging does not comprise fluorocarbon compounds, and wherein the coating produced with the polyelectrolyte complex has a fat barrier property.