Aqueous polymer dispersions from long chain cellulose fatty acid ester for coating of paperboard, TAPPI Journal October 2026

 


Application: This study demonstrates that aqueous polymer dispersions can also be prepared from preformed cellulose-based polymers using different techniques. These dispersions can be applied, for example, as barrier coatings for different fiber-based packaging materials.

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Author: M. Vähä-Nissi, A. Anghelescu-Hakala, A. Singh, Heli Auvinen, P. Willberg-Keyriläinen, S. Saaristo
Aqueous polymer dispersions from long chain cellulose fatty
ABSTRACT: Fiber-based substrates are coated with aqueous polymer dispersions to obtain the necessary barrier properties for, e.g., food service, takeaway, and other packaging applications. There is interest to replace non-renewable substances driven by the concerns over the price stability and depletion of fossil resources, environmental and safety issues, and legislative actions. In this study, we demonstrated that stable aqueous polymer dispersions with solids content of at least 35% can be prepared from a long chain cellulose fatty acid ester (cellulose octanoate) using both solvent-based and thermomechanical processes. In the solvent-based process, water and additives were mixed with a polymer dissolved in chloroform followed by solvent removal. In the thermomechanical method, water and stabilizers were added into polymer melt under mixing in a pressurized reactor. Dispersions were tested as coatings on paperboard and assessed for their grease resistance and water and oil barrier. Oil barrier was clearly improved with most of the dispersions. In addition, proper film formation was necessary for achieving improved water barrier. However, the stabilizing system had a clear impact on the dispersion stability and the water barrier performance of these coatings.
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