Process for preparing an aqueous polymer dispersion.

Process for preparing an aqueous polymer dispersion with solids content of polymers of X% by weight using the aqueous emulsion polymerization, initiated by free radical in a polymerization vessel, wherein is prepared in the polymerization vessel an aqueous polymer dispersion with a solids content of polymers of X + Y% by weight by the aqueous emulsion polymerization initiated by radicals, this aqueous polymer dispersion is transferred to a container the polymerization vessel was rinsed with water and rinsing water obtained is used for diluting the aqueous polymer dispersion in the vessel to a solids content of X% by weight.