Process for the preparation of an aqueous polymer/melamine dispersion comprising the steps of (a) providing an at least partially neutralised polymer A containing free carboxylic acid groups, including salts thereof, having a weight average molecular weight greater than 500 g/mol selected from one or more members of the group: at least partially neutralised polyurethanes, at least partially neutralised alkyd resins, and at least partially neutralised polyester; (b) providing melamine compounds as reaction products B, the reaction products optionally being at least partially etherified with short-chain monoalcohols having 1 to 4 carbon atoms, including their condensation products of on average greater than 1 to 3 units, the melamine compounds used being the reaction products of formaldehyde with melamine, benzoguanamine, acetoguanamine and/or bisguanamines and the melamine compounds being methylolated on average with at least 1 mol of formaldehyde per mol of primary amino groups on the aminotriazine nucleus; (c) bringing together at least the at least partially neutralised polymer A, the reaction product B and water, optionally in the presence of an emulsifier, with mixing to obtain an emulsion having a pH greater than 7.5, wherein the reaction product B contains no water or at most up to 20% by weight of water, and the at least partially neutralised polymer A contains less than 5% by weight of water, the at least partially neutralised polymer A and the reaction product B are mixed at a temperature of 40 to 95°C and are then introduced together into water to produce a dispersion with water as disperse phase or water is then added to the mixture, the emulsion being kept at a temperature of greater than 80°C for less than 1 hour, the dispersion containing 20 to less than 50% by weight of the reaction product B and greater than 50% by weight to 80% by weight of the polymer A, based on the solids content. (a) providing an at least partially neutralised polymer A containing free carboxylic acid groups, including salts thereof, having a weight average molecular weight greater than 500 g/mol selected from one or more members of the group: at least partially neutralised polyurethanes, at least partially neutralised alkyd resins, and at least partially neutralised polyester; at least partially neutralised polyurethanes, at least partially neutralised alkyd resins, and at least partially neutralised polyester; (b) providing melamine compounds as reaction products B, the reaction products optionally being at least partially etherified with short-chain monoalcohols having 1 to 4 carbon atoms, including their condensation products of on average greater than 1 to 3 units, the melamine compounds used being the reaction products of formaldehyde with melamine, benzoguanamine, acetoguanamine and/or bisguanamines and the melamine compounds being methylolated on average with at least 1 mol of formaldehyde per mol of primary amino groups on the aminotriazine nucleus; (c) bringing together at least the at least partially neutralised polymer A, the reaction product B and water, optionally in the presence of an emulsifier, with mixing to obtain an emulsion having a pH greater than 7.5, wherein the reaction product B contains no water or at most up to 20% by weight of water, and the at least partially neutralised polymer A contains less than 5% by weight of water, the at least partially neutralised polymer A and the reaction product B are mixed at a temperature of 40 to 95°C and are then introduced together into water to produce a dispersion with water as disperse phase or water is then added to the mixture, the emulsion being kept at a temperature of greater than 80°C for less than 1 hour, the dispersion containing 20 to less than 50% by weight of the reaction product B and greater than 50% by weight to 80% by weight of the polymer A, based on the solids content. wherein the reaction product B contains no water or at most up to 20% by weight of water, and the at least partially neutralised polymer A contains less than 5% by weight of water, the at least partially neutralised polymer A and the reaction product B are mixed at a temperature of 40 to 95°C and are then introduced together into water to produce a dispersion with water as disperse phase or water is then added to the mixture, the emulsion being kept at a temperature of greater than 80°C for less than 1 hour, the dispersion containing 20 to less than 50% by weight of the reaction product B and greater than 50% by weight to 80% by weight of the polymer A, based on the solids content.