Renewable soybean oil-based compostable primer for multilayer moisture barrier packaging films

Overview

This solution offers a renewable and compostable primer technology for multilayer packaging films that require effective moisture barrier performance. Built on soybean oil as a starting material, the primer addresses a critical challenge in barrier film construction: achieving strong, reliable adhesion between metallic and polymeric layers. The modular molecular design allows incorporation of diverse functional groups to ensure compatibility with a wide range of substrates, from metals to polymers.

The technology draws on extensive prior experience developing soybean oil-based coatings, including rehealable automotive topcoats where chemical functionality was introduced at multiple design points to control adhesion, hardness, gloss, and crosslinking behavior. That foundational knowledge is now being redirected toward the development of high-performance, compostable primers specifically engineered for barrier film applications.

Technical specifications

Key features:

• Renewable feedstock: Soybean oil and other fatty acids serve as the primary starting materials, supporting compostability and reducing reliance on petroleum-derived chemistries.
• Modular functional design: Multiple functional groups can be incorporated at various design points to tune substrate compatibility across metallic and polymeric surfaces.
• Tunable crosslinking: Synthetic design decisions control stoichiometric deficiencies in dienophile, irreversible linkage presence, and crosslinking agent quantity and composition to optimize adhesion and barrier performance.
• Scalable synthesis: Planned synthetic methodologies are straightforward and amenable to scale-up for commercial production.
• Substrate versatility: Engineered to promote adhesion in multilayer barrier film constructions spanning both metallic and polymeric layers.

Technology readiness level

The technology is at an early-to-mid stage of development. Prior work has validated soybean oil as a viable starting material for functional coatings, including rehealable automotive topcoats where adhesion, hardness, gloss, and crosslinking were optimized. However, the specific primer formulation for moisture barrier packaging films has not yet been synthesized and tested. Future validation will involve preparing functional primer coating layers from soybean oil and other fatty acids, then evaluating performance using established ASTM testing protocols to confirm barrier properties, metal compatibility, and compostability.