Aqueous polyesters for high solids stoving varnishes

摘要

Aqueous polyesters which contain a) from 35 to 65% by weight of a polyester resin containing urethane, carboxyl and hydroxyl groups, b) from 0.1 to 1.5% by weight of a basic neutraliser, c) from 0 to 7.5% by weight of an organic solvent, and d) from 26 to 64.9% by weight of water, where the urethane-modified polyester resins a) have been prepared by reacting selected starting materials; aqueous stoving enamels (paints, varnishes) whose binder essentially comprises these polyesters, crosslinking resins and optionally further hydroxy-functional polymers; and the use of the polyesters, optionally in combination with crosslinking resins and other water-compatible binders, in paints, coating compositions and sealants.