| 摘要 |
A novel epoxy ester resin adapted for use in a thermosetting coating composition is provided, having number average molecular weight (Mn) about 900 to about 5000 and being the reaction product of diepoxide, for example bisphenol-A epichlorohydrin epoxy resin, with (i) a first reactant selected from diphenol, for example bisphenol-A, dicarboxylic acid, for example the dimer acid reaction product of the dimerization of C-18 fatty acid, and any combination thereof and (ii) fatty acid, for example Soya fatty acid, which reactions occur at least in part substantially simultaneously and at a temperature reaching at least about 137 DEG C (280 DEG F). Preferably, catalyst is employed for the reactions. Also provided is a novel, solvent based, thermosetting coating composition comprising the novel epoxy ester resin of the invention, polyfunctional aminoplst crosslinking agent, and optionally, polycarboxy functional polymeric catalyst. Also provided is a method of making a humidity and solvent resistant coating on a substrate, adapted to provide corrosion protection to the substrate, for example, to bare sheet metal of an automotive vehicle body, which method comprises applying the novel coating composition of the invention to the substrate, for example, by spraying techniques, and subjecting the applied coating to an elevated temperature for a time sufficient to cure the coating. |
