Polyaniline films are produced on glass surfaces during oxidative polymeriz
ation of aniline. If a steric stabilizer is introduced into reaction mixtur
e, a macroscopic precipitation of polyaniline is prevented and colloidal po
lyaniline dispersions are obtained instead. The films are produced also in
dispersion polymerization. They are smooth and of submicrometer thickness w
ith some colloidal particles adhering on their surface.