Biodegradable sprayable latex/cnc nanocomposite coatings

Overview

The University of Minnesota presents an innovative solution for sustainable packaging: biodegradable sprayable coatings based on their patented macromonomer (MM) latex technology. These coatings are enhanced with cellulose nanocrystals (CNCs) and nanofibrils (CNFs), creating dense films that significantly improve water vapor and oxygen transmission rates (WVTR and OTR). Designed for easy application using standard spray equipment, these coatings coalesce into food-safe barriers that meet stringent environmental standards for recyclability and biodegradability.

Technical specifications

• Macromonomer latex technology: Patented MM technology (U.S. Patent 9,469,797) forms the basis of this coating. The latex is waterborne and sprayable through 0.8–1.3 mm HVLP nozzles.
• Cellulose nanocrystals enhancement: CNCs and CNFs provide mechanical reinforcement and barrier improvement through nanostructured tortuosity.
• Repulpability and biodegradability: Validated using USPS methods with over 85% fiber yield, in collaboration with NRRI for biodegradation testing.
• Renewable content: Includes soy-based latex variants to enhance the renewable content of the coatings.
• Proven collaborative development: With partners such as Arkema, Dow, and others, ensuring robust and versatile applications.

Technology readiness level

Currently at TRL 4, this technology has undergone lab-scale validation. The next phases include optimizing formulations for sprayability, testing on fiber substrates, and conducting comprehensive repulpability and biodegradability evaluations. A pilot spray validation is planned for the next 12 months to advance to TRL 6.