Process for the preparation of aqueous polymer dispersions the dispersions obtained by the process and their use for the production of coatings

摘要

An improved coating for heat resistant substrates is an aqueous dispersion of polymers prepared by polymerization of olefinically unsaturated monomers in an aqueous medium in the presence of radical formers and emulsifiers, wherein the emulsifiers are polyisocyanate addition products having a molecular weight below 20,000 and containing from 5 to 1000 milliequivalents of anionic structures corresponding to the following formula -NH-CO-N(-)-C 3BOND N incorporated therein per 100 g of solids content.