Stora Enso has patented a gas barrier film for paper-based packaging, combining microfibrillated cellulose and a polymer layer grafted with a fatty acid halide. The innovation aims to enhance packaging material properties. 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.
Gas barrier film for paper packaging with microfibrillated cellulose
A recently granted patent (Publication Number: US11851819B2) discloses a gas barrier film designed for paper or paperboard-based packaging materials. The film comprises a microfibrillated cellulose layer (MFC layer) with at least one surface grafted with a fatty acid halide, along with a polymer layer on the grafted surface. The MFC layer may contain at least 50% MFC, polyvinyl alcohol (PVOH), and a pigment, with a basis weight of less than 55 gsm. The fatty acid halide used can be C16 or C18, such as palmitoyl chloride or stearoyl chloride. The polymer layer includes a thermoplastic polymer and may have a tie resin for better adhesion to the MFC layer.
Moreover, the patent covers a paper or paperboard-based packaging material incorporating this gas barrier film. The material can have the MFC layer directly in contact with the substrate or separated by an adhesive polymer layer. Additionally, protective polymer layers can be added to enhance performance. The packaging material aims for an oxygen transfer rate (OTR) of less than 10 cc/m2/24 h/atm, as per ASTM F-1927 standards. The patent also extends to applications like carton blanks and containers utilizing the gas barrier film. The method for manufacturing the film involves grafting the MFC layer with a fatty acid halide and applying a polymer layer through extrusion coating, ensuring strong adhesion and effective gas barrier properties.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
