Alkyd resins are synthetic resins obtained by reacting a polyacid with a polyalcohol and modified with oils or fatty acids.
They are classified based on the type and amount (length) of oil they carry. They are basically divided into short, medium and long alkyd resins. In these resins, the length of the oil is what provides the characteristics of solubility, viscosity, flexibility and hardness. The short and medium alkyds are usually used in industry and the long ones are more oriented to the decoration sector.
Alkyd resins are mainly used to obtain oxidative drying enamels and paints or to obtain 2-component coatings when they react with a hardener based on isocyanates.