Abstract
NEW modified anti-corrosive polyesteramide resins were obtained by condensation polymerization reaction between phthalic anhydride (PA) and N, N-bis - (2-hydroxyethyl) linseed oil fatty acid amide (HELA) which was partially replaced with 7-(2,3dihydroxepropyl) theophyline as the ingredient source of the polyol used. The structure of the resin was confirmed by FT-IR spectral studies. The coatings of 40 +/- 5 mu m thickness were applied to the surface of glass panels and mild steel strips by means of a brush. The coating performance of the resins was evaluated using international standard test methods (ASTM) and involved the measurement of phyisco-mechanical properties such as viscosity, drying time, specular gloss, pencil hardness, adhesion, flexibility and impact resistance. Chemical resistance of the resins to water, acid, alkali and solvent was also evaluated to ascertain their suitability as a surface coatings vehicle. The results show that the modification enhances both phyisco-mechanical and chemical properties. The resins were incorporated within primer formulations and evaluated as anti-corrosive single coatings. The results illustrate that the introduction of 7-(2,3dihydroxepropyl) theophyline, containing a theophyline ring, within the resin structure, enhances the corrosion resistance performance of polyesteramide resins.