Stora Enso has filed a patent for packaging laminates with a paper substrate and a barrier film made of microfibrillated cellulose. The laminate includes adhesive layers and the barrier film must contain at least 50% MFC. The invention also covers methods for manufacturing such laminates. GlobalData’s report on Stora Enso gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Stora Enso, Sustainable packaging paper coating was a key innovation area identified from patents. Stora Enso's grant share as of January 2024 was 57%. Grant share is based on the ratio of number of grants to total number of patents.
The patent application (Publication Number: US20240034027A1) describes a laminate structure comprising a paper or paperboard substrate in contact with multiple adhesive layers and a barrier film containing at least 50 wt-% microfibrillated cellulose (MFC). The barrier film can also include polyvinyl alcohol (PVOH) and has a basis weight ranging from 15 to 80 gsm, with specific porosity and roughness values. Additionally, the laminate has specific adhesive types with defined glass transition temperatures for the first and second adhesive layers.
Furthermore, the patent application outlines a method for manufacturing the laminate, involving applying adhesives to the substrate and barrier film before laminating them together. The process can be carried out, at least partly, in a printing press. The barrier film composition can contain up to 80 wt-% MFC, and the adhesives may include co-binders. These claims highlight the innovative use of microfibrillated cellulose in barrier films for laminates, along with specific adhesive properties and manufacturing methods to achieve desired laminate characteristics.
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