Carboxyl-terminated polyesters for the preparation of powder coating compositions

摘要

Carboxyl-terminated polyesters comprising the reaction products of (a) an aliphatic hydroxyl-terminated polyester prepared from 1,4-cyclohexanedicarboxylic acid and an alcohol component comprising (1) from 10 to 100 equivalent % of a cycloaliphatic diol and (2) from 90 to 0 equivalent % of a straight or branched chain aliphatic polyol having 2 to 12 carbon atoms, with (b) an aliphatic and/or aromatic dicarboxylic acid or the corresponding anhydride, process for preparing the same and the thermosetting powder compositions based on these polyesters and polyepoxy compounds used for the production of powder varnishes and paints. These polyesters provide coatings having an excellent weatherability combined with outstanding mechanical properties, even if curing takes place at low temperature.