Aqueous polymer dispersion, process for its preparation and application

The invention relates to an aqueous polymer dispersion in which the polymers contain carboxyl groups and can be adjusted by adjusting the pH in their behavior. The polymers are uncrosslinked copolymers or terpolymers whose carboxyl groups are partially neutralized. The dispersion medium is free of organic solvents and preferably free of wetting agents and. Foreign ions. The preparation of the dispersion is preferably carried out starting from the finished polymer by comminution in an aqueous, preferably alkaline medium. The dispersions are suitable for the production of protective coatings.