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AssigneeTeknologian tutkimuskeskus VTT Oy
InventorsTarja Tamminen, Jarmo Ropponen, Eva-Lena Hult, Kristiina Poppius-Levlin
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In this study, commercially available softwood lignin was esterified with tall oil fatty acid (TOFA) and tested as barrier material in fiber-based packaging material. The modified lignin samples were applied with a bar coater forming an even coating on the paperboard substrate. A significant decrease in WVTR and OTR value was observed for paperboard coated with the modified lignin as well as pure TOFA used as a reference. In contrast to the TOFA coating, the modified lignin coatings exhibited a high and stable contact angle. The coating material did not affect the tensile strength of the paperboard. According to the results, the demonstration of the conversion of lignin into a value added product has been shown. Furthermore, the novel coating material shows promising properties for the development as sustainable barrier material in fiber-based packaging material to replace oil-placed barriers.
Modified lignin obtained by modifying lignin derived from:
Method of modifying lignin comprising esterifying at least a part of the hydroxyl groups present in the lignin with a tall oil fatty acid composition, wherein the lignin is derived from a kraft process, a soda cooking process, a polysulphide cooking process or an organosolv process and wherein the tall oil fatty acid composition contains at least 80% by mass, calculated from the total solid matter, of fatty acids having 18 carbon atoms.
Dependencies are inferred from the claim text.