Synthetic high-aspect-ratio silicate coating for superior gas barrier on polymer substrates

Overview

This technology delivers a superior gas barrier by incorporating synthetic silicates with an extraordinary aspect ratio—far exceeding currently available materials—into a thin coating layer applied to polymer and paper-based substrates. The high-aspect-ratio inorganic silicates laminate parallel to the substrate surface, creating a tortuous diffusion pathway that forces gases to travel a much longer route around impermeable platelets. This approach drastically reduces both oxygen transmission rate (OTR) and moisture vapor transmission rate (MVTR), addressing a critical performance challenge in flexible packaging, food preservation, pharmaceutical protection, and industrial barrier film applications.

Technical specifications

Key features:

• Synthetic silicates with exceptionally high aspect ratio, far surpassing conventional barrier fillers
• Thin coating layer of approximately 1.5 µm achieves a 100-fold reduction in MVTR (from 500 to 5 g/m²/day at 23 °C and 50% RH)
• Effective on PET substrates and paper-based substrates that otherwise lack inherent moisture barrier properties
• Multi-layer coating architecture enables further reduction in gas transmission rates
• Inorganic silicate platelets are impermeable to gases, forcing diffusion along extended tortuous pathways
• Compatible with optimization of silicate loading and binder matrix composition
• Potential for binders with intrinsic water vapor barrier properties to further enhance performance

How it works:

The silicates are dispersed within a binder matrix and applied as a coating. During application, the high-aspect-ratio platelets align parallel to the substrate in multiple overlapping layers. Because the inorganic silicates are impermeable to oxygen and water vapor, permeating molecules must navigate around each platelet, dramatically extending the diffusion path length and reducing overall transmission rates.

Technology readiness level

The technology has been experimentally validated, demonstrating a 100-fold MVTR reduction on a paper-based substrate with a single 1.5 µm coating layer. Multi-layer configurations have been shown to further improve barrier performance. Ongoing development focuses on optimizing silicate loading, binder chemistry, and application processes—including multi-layer deposition—to meet target performance values. Additional characterization of adhesion to PET, mechanical resistance, and other key functional properties is underway to confirm readiness for broader commercial deployment.