SYNTHESIS AND APPLICATIONS OF OIL-MODIFIED POLYESTERAMIDE RESINS FOR SURFACE-COATINGS

Polyesteramide resins, suitable for coating applications, have been sy nthesised, using two different oils, viz: a non traditional, nonoxidis ing type, pilu fat (Salvadora Oleoides) and a traditional oxidizing ty pe, dehydrated castor oil (DCO). N, N- bis-(2-hydroxyethyl) fattyamide s (HEFAs) have been prepared by aminolysis of both pilu oil and DCO wi th diethanolamine using zinc oxide as a catalyst. HEFAs were reacted w ith isophthalic acid in varying molar ratios to obtain a series of hyd roxy terminated polyesteramides (HTPEAs). Coating compositions from th ese resins were formulated by incorporation of butylated melamine form aldehyde (BMF) resin in two different ratios. The baked film propertie s of these resins have been evaluated. Furthermore both pilu fat and D CO can be used as components of industrial stoving finishes. Pilu fat, being nonoxidising type, can replace traditionally used coconut oil i n such applications.