A biodegradable emulsion designed for coating active packaging

The technology involves the production of a biodegradable paraffin-water emulsion used to impregnate base paper with a recommended basis weight of at least 90^g/m², which increases the paper’s water repellency and improves its other barrier properties. The emulsion is enriched with natural ingredients that have biostatic properties. The emulsion was developed for coating paper using the Meyer bar method.

Key specifications of the emulsion and the coated Mondi Pro Vantage Kraftliner 125^g/m² paper

• dry matter content: 30–40%
• average emulsion particle size (hydrodynamic diameter of a 1% v/v emulsion, DLS) 300–400 nm
• Apparent viscosity of the emulsion at 23 °C: < 100 mPas, Brookfield viscometer, spindle No. 20
• biodegradability confirmed using the OECD 302B method
• The emulsion is thinned by shear

• Water repellency of coated paper:_{Cobb 60} 3.9^g/m²; initial water repellency of uncoated paper:_{Cobb 60} 47.3^g/m²
• airflow rate (Bendsen method): 106 mL/min