CASTOR-OIL BASED POLYESTERAMIDE-AMINO RESIN SYSTEMS FOR INDUSTRIAL COATING APPLICATIONS

Castor oil (Ricinus communis) has been used in the synthesis of polyes teramide resins, suitable for surface coating applications. N,N-bis-(2 -hydroxyethyl) castor amides (HECA) have been prepared by aminolysis o f castor oil with diethanolamine using zinc oxide as a catalyst. HECA was reacted with two different dibasic acid compounds viz. phthalic an hydride and isophthalic acid in varying molar ratios to obtain a serie s of hydroxy terminated polyesteramides (HTPEA). Coating compositions from these resins were prepared by incorporation of butylated melamine formaldehyde (BMF) resin in two different ratios. The baked film prop erties of these compositions have been studied. From the results, it a ppears that polyesteramide resins prepared, using castor oil, which is abundantly available at relatively low cost, can successfully he used as a component of industrial baking finishes.