VERFAHREN ZUR HERSTELLUNG EINES MEHRSCHICHTIGEN UEBERZUGES, WASSERVERDUENNBARE BESCHICHTUNGSZUSAMMENSETZUNGEN, WASSERVERDUENNBARE EMULSIONSPOLYMERE UND VERFAHREN ZUR HERSTELLUNG VON WASSERVERDUENNBAREN EMULSIONSPOLYMEREN

摘要

The invention concerns a process for the production of multi-layer coatings, which uses a pigmented aqueous base coating composition containing a water-dilutable emulsion polymer as the film-forming material. The water-dilutable emulsion polymer is produced by two-stage emulsion polymerization. In the first stage, a polymer with a glass transition temperature (TG1) of +30 to +110 DEG C is produced. In the second stage, a monomer mixture which, if polymerized alone, would give a polymer with a glass transition temperature (TG2) of -60 to +20 DEG C is polymerized in the presence of the polymer produced in the first stage. The hydroxyl number of the emulsion polymer lies between 2 and 100.