We have prepared films with a transparency of more than 90% and a resistance in the antistatic range from 1wt.% polypyrrole-encapsulated latexes (PPy-encapsulated latexes) by a heat treatment at 120 o C for several hours. The initial film resistance is below 1MΩ/ , but after a temporary decrease in resistance upon increasing the film temperature, the film resistance increases strongly. A clear relationship between the temperature and the stability of the film resistance is demonstrated.It is shown that the increase in film resistance upon heating can be limited by the incorporation of a more stable counter-anion, like p-toluenesulfonic acid or by performing the heat treatment in an inert atmosphere. The p-toluenesulfonic acid has been incorporated by two different methods: directly in the in situ synthesis of the PPy shell or later via ion exchange. The direct incorporation of the stable counter-anion has a more positive influence on the resistance stability, but a drawback of this method is that the risk of pure PPy particle formation apart from the core-shell latex particles is found to increase.