Abstract: Carboxyl group-terminated polyesteramides comprising the reaction products of at least one diamine and a carboxyl group-terminated polyester selected from(a) a polyester prepared from at least one aliphatic and/or cycloaliphatic dicarboxylic acid and at least one polyol:(b) a polyester which is the reaction product of(i) at least one aliphatic and/or cycloaliphatic dicarboxylic acid and/or isophthalic acid, with(ii) a hydroxyl group-terminated polyester, and(c) a polyester which is the reaction product of(i) at least one aliphatic and/or cycloaliphatic dicarboxylic acid, with(ii) a polyester containing both terminal hydroxyl and terminal carboxyl groups, prepared by esterification of(iii) isophthalic acid with(iv) a hydroxyl group-terminated polyester,processes for preparing the same, and the powdered thermosetting compositions based on these polyesteramides and polyepoxy compounds for the production of powdered varnishes and paints which can be applied with a triboelectric spray gun.

Abstract: Carboxyl group-terminated polyesteramides comprising the reaction products of at least one diamine and a carboxyl group-terminated polyester selected from(a) a polyester prepared from at least one aliphatic and/or cycloaliphatic dicarboxylic acid and at least one polyol;(b) a polyester which is the reaction product of(i) at least one aliphatic and/or cycloaliphatic dicarboxylic acid and/or isophthalic acid, with(ii) a hydroxyl group-terminated polyester, and(c) a polyester which is the reaction product of(i) at least one aliphatic and/or cycloaliphatic dicarboxylic acid, with(ii) a polyester containing both terminal hydroxyl and terminal carboxyl groups, prepared by esterification of(iii) isophthalic acid with(iv) a hydroxyl group-terminated polyester,processes for preparing the same, and the powdered thermosetting compositions based on these polyesteramides and polyepoxy compounds for the production of powdered varnishes and paints which can be applied with a triboelectric spray gun.

Abstract: The present invention provides a process for the preparation of carboxyl group-terminated polyesters, which comprises reacting in one step at elevated temperatures, terephthalic acid and at least one dihydric aliphatic compound and optionally an aromatic polycarboxylic acid having three or more carboxyl groups and/or a polyhydric organic compound having three or more hydroxyl groups and/or a linear aliphatic or cycloaliphatic dicarboxylic acid, the proportions by weight of the respective reactants being such as to produce a polyester having an acid number of from 10 to 25 mg KOH/g and a hydroxyl number of at most 5 mg KOH/g.