Polyols are dried by azeotropic distillation (e.g., with toluene), catalyst is added followed by addition of isocyanate. Polyol
ester stocks are usually made up of long-chain linear FAs (C8–C18) of plant or animal origin esterified with multifunctional
alcohols which include two to six hydroxy groups.
ester stocks are usually made up of long-chain linear FAs (C8–C18) of plant or animal origin esterified with multifunctional
alcohols which include two to six hydroxy groups.