Compatible compositions based on aqueous polyurethane dispersions and sodium alginate

► The alginate content was studied on properties of aqueous polyurethane dispersions. ► Excellent miscibility was shown on the compositions of polyurethane and alginate. ► The morphology of alginate in polyurethane matrix was shown as particulate with different sizes. ► The presence of alginate in microstructure was determined by sodium peak in EDX.