Reversible glue for recyclable blister pack separation
Innovative water-based reversible glue for adhering and separating dissimilar materials in blister packs, enabling recycling. Utilizes emulsion polymerization with polyelectrolyte stabilization and clay for reversibility. Offers scalable and cost-effective recycling solutions.
Overview
A groundbreaking water-based reversible glue has been developed to adhere dissimilar materials, such as metals and low surface energy plastics, commonly found in blister packs. This innovative adhesive facilitates the recycling process by allowing the materials to be separated at the end of their lifecycle through washing in an alkaline or acidic solution. This technology is not only scalable and cost-effective, utilizing commodity materials, but also promotes sustainability by enabling the recycling of previously non-recyclable components.
Technical specifications
The adhesive is synthesized using emulsion polymerization of styrene and butyl acrylate, stabilized by a polyelectrolyte layer of poly(acrylic acid), which provides strong adhesion. Clay platelets are incorporated into the formulation, rendering the adhesive reversible. The glue can be applied mechanically or via spray, offering versatility in application methods. It is designed to be as strong as other water-based adhesives, with a shelf life of approximately one year. Future formulations aim to replace styrene and butyl acrylate with environmentally friendly components.
Technology readiness level
Currently at Technology Readiness Level 4, this adhesive has undergone initial validation and is poised for further testing on packaging materials. Upcoming tests will focus on adhesion strength, reversibility, and barrier properties, with a timeline of six months for comprehensive testing. Potential collaborations include licensing, co-development, and sponsored research.
About Newcastle University
Newcastle University is a comprehensive public research university in Newcastle upon Tyne, with broad academic and translational activity. Its city‑centre Newcastle Helix innovation district—developed with Newcastle City Council and Legal & General—co‑locates researchers with companies and hosts national innovation centres to enable fast collaboration. Deep integration with Newcastle upon Tyne Hospitals NHS Foundation Trust, supported by a joint research office, enables streamlined study setup, access to clinical populations, and end‑to‑end clinical translation. Research is backed by competitive funding from UKRI councils, the National Institute for Health and Care Research, major charities, the European Union, and industry. A dedicated technology transfer office supports IP, licensing, spinouts, and knowledge‑transfer partnerships.
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