A new technology from Covestro makes it possible to weaken the bond strength of polyurethane (PU) adhesives. Flexible packaging made from several layers of film enables the hygienic and safe storage of many foods. However, disposal of this versatile packaging has been unsustainable. After use, the bonded films in the material mix are difficult to separate from one another, making the packaging only partially recyclable.

Covestro has developed a process for recycling companies and packaging manufacturers to address this. In the case of multi-layer film packages laminated with PU adhesive, the respective materials can be separated from one another again thanks to the new technology. A team from Covestro will present the development at the K 2022 trade fair from October 19-26, in Düsseldorf, Germany.

In the process, a special separation agent specifically weakens the bond strength of the PU adhesive. Since the separation agent consists of natural ingredients and water, it is also very sustainable. For packaging manufacturers and recyclers, the process offers a major advantage.

"Our know-how helps them to make better use of the residual value of their packaging and thus makes more materials available to the recycling industry," said Thomas Fait, New Business Development manager for Adhesives at Covestro. Fait has led the development of the technology on a laboratory scale. 

For more information, visit: www.covestro.com.