Casein is a phosphoprotein that can be separated into various electrophoretic components, such as α₂-Casein, κ-Casein, β-casein, and γ-casein. Casein has also been blended and grafted with other polymers, cross-linkers, or monomers to improve its functional properties, including mechanical properties, water resistance, thermal stability, and barrier properties. Casein has various applications in the paper, leather, textile, and food industries, serving as coatings, adhesives, and packaging materials^[1].