WATER-DILUTABLE COATING AGENT FOR PREPARING THE BASE LAYER OF A MULTILAYER COATINGS

摘要

Basecoating compositions for preparing multilayered protective and/or decorative coatings comprise aqueous dispersions which contain a) as film-forming material one or more polyurethane resins having an acid number of from 5 to 70, which has been prepared by preparing from (A) linear polyetherdiols and/or polyesterdiols having a molecular weight of from 400 to 3,000 (B) diisocyanates and (C) compounds which contain two groups which are reactive toward isocyanate groups, one or more of the compounds used as component C having one or more groups capable of anion formation which have preferably been neutralized before the reaction with a tertiary amine, an intermediate which has terminal isocyanate groups and whose free isocyanate groups have subsequently been reacted with a polyol which contains three or more hydroxyl groups, preferably a triol, (b) pigments and (c) further customary additives.