Products are synthesized by removing primary water through the condensation reaction of diacid (glycol) and removing a small amount of diol using vacuum to adjust acidity and molecular weight. In synthesizing polyurethane, the soft segment of polyurethane bonds significantly affects elastic deformation, influencing physical properties such as flexibility, hydrolysis resistance, and bending. This process can manufacture resins with a wide range of mechanical properties, from elastic to rigid ones, depending on the choice of polyol type.