Process for the preparation of water-dilutable resins, resins produced thereby, and their use in thermosetting surface coatings.

摘要

Resinous compounds, for aqueous thermosetting coating dispersions or solutions after neutralization, are prepared by reacting a diglycidyl ether of a dihydric phenol with a mono-carboxylic acid and dimerized unsaturated fatty acids, with epoxy equal to or in slight excess over carboxyl, below 150°C in the presence of an epoxy/carboxyl esterification catalyst to produce a non-acidic intermediate, and reacting the intermediate below 150°C with a polycarboxylic acid anhydride in amounts to provide an acid value from 5-35; aqueous dispersions are prepared by at least 50% neutralization of compounds having acid value 5-15.