Biobased copolyester coatings for sustainable moisture and oxygen barrier applications

Overview

This research delivers a family of biobased copolyester coatings engineered to provide superior barrier performance while preserving biodegradability. By combining unique renewably-sourced dicarboxylic acids and diols into tailored copolymer structures, the technology enables melt- and solution-processable coatings suitable for paper and polymer film substrates. The approach addresses growing market demand for sustainable packaging and agricultural solutions that reduce reliance on petroleum-based barrier materials without sacrificing performance.

Potential applications include moisture-resistant paper coatings, oxygen-sensitive food packaging, and controlled-release matrices for agricultural chemicals. The ability to tune water transport properties through monomer selection and chain orientation offers manufacturers a versatile platform for replacing conventional barrier materials with biobased alternatives.

Technical specifications

Key features:

• Renewable monomer platform: Built from four renewably-sourced dicarboxylic acids and diols, enabling a wide array of mechanical, thermal, and chemical property combinations
• Tunable barrier performance: Water transport properties can be adjusted through monomer selection and ratio variation
• Dual processing capability: Compatible with both solution coating and melt coating methods for flexible manufacturing integration
• Chain orientation optimization: Processing strategies aimed at achieving high polymer chain orientation to enhance barrier properties
• Demonstrated moisture barrier: Delayed water transport validated in coatings up to 90 microns thick
• Crystallinity sensitivity: Lower crystallinity copolymers shown to be less effective at preventing water transport, guiding formulation design
• Controlled release capability: Validated for use in controlled release of agricultural chemicals

Technical approach:

The technology leverages copolymer design principles where aliphatic and aromatic comonomer ratios are systematically varied to optimize barrier performance. Future development focuses on achieving oriented chain structures during melt and solution processing to further enhance barrier properties, along with studying adhesion and coextrusion compatibility with existing commercial polymer films.

Technology readiness level

The technology has been validated through laboratory-scale coating trials on paper substrates using both solution and melt processing methods. Water and ion transport studies have confirmed barrier functionality, and controlled-release applications for agricultural chemicals have been demonstrated. Ongoing and planned validation includes evaluation of oxygen and water barrier properties across different aliphatic-aromatic comonomer ratios, processing optimization for chain orientation, and adhesion and coextrusion studies with sponsor-relevant polymer films. The technology is at an advanced research and development stage, ready for sponsored research collaboration to advance toward commercial scale-up and application-specific optimization.