Stora Enso has patented a method for preparing an aqueous dispersion of lignin, involving a specific pH range and a high solid content of lignin. The process is notable for not requiring active heating during preparation, enhancing its efficiency for resin production. 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 July 2024 was 56%. Grant share is based on the ratio of number of grants to total number of patents.
The granted patent US12071518B2 outlines methods for preparing lignin dispersions and resins, emphasizing processes that do not require active heating. The first claim details a method for creating a lignin dispersion by providing an aqueous medium with a pH between 1 and 7, adding lignin in a slurry form with a solid content ranging from 30 wt-% to 95 wt-%, and mixing until a dispersion is achieved. Notably, this process is conducted without actively heating the aqueous medium, and the resulting dispersion can contain 5-60 wt% lignin, with a preferred range of 35-60 wt%. Additional claims specify that the slurry may be sieved to reduce the presence of larger lignin agglomerates.
The second claim describes a method for preparing a resin, which begins similarly with an aqueous medium and lignin slurry. After achieving the dispersion, alkali, phenol, and formaldehyde are added, and the mixture is maintained at a temperature between 30°C and 95°C for at least 30 minutes. This method also avoids active heating during the initial steps. The resin produced can be utilized in various applications, including laminates, engineered wood products, and insulation products. The claims further specify parameters such as the pH of the aqueous medium and the characteristics of the lignin slurry, ensuring a controlled and efficient preparation process for both the lignin dispersion and the resin.
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