About Gas Barrier Performance and Recyclability of Waterborne Coatings on Paperboard

For preserving food packed in environmentally friendly and recyclable paperboard packages, it is important to have sufficient gas barrier performance of the container. Paperboard has poor intrinsic properties overcome this deficiency, so a coating needed that does not hinder recycling substrate. However, recyclability such coatings been rarely studied. Here, both removal an alkali-soluble resin (ASR)-stabilized waterborne from are investigated. barriers for gases, as nitrogen, carbon dioxide, oxygen, defect-free which achieved by applying three layers. The oxygen transmission rate (OTR) three-layered on was 920 cm3/(m2∙day). water vapor barriers, two layers already show strong improvement, follows different penetration mechanism than other tested gases. WVTR double coated 240 g/(m2∙day). Preliminary results removed immersion aqueous alkaline solution at room temperature. This causes de-protonation carboxylic acids ASR subsequent re-dispersion water. Removing double-layer more challenging, possibly due coating/coating interface between enhanced adhesion paperboard.