Abstract: The present invention relates to poly[2,2?-(3-alkyl-acetate)thiophene] polythiophenes of linear C1-C12 alkyls of formula (I) which are easily dispersible in alkyd and epoxy type paints, and the addition of 1% of the electroconductive polymer allows the use thereof as anti-corrosive additives and as anti-corrosion microparticles of regulatable properties. The addition of 1% of electroconductive poly[2,2?-(3-methylacetate)thiophene] (PTE) polymer in the alkyd and epoxy priming paint substantially improves the adherence, blistering and resistance to corrosion properties of steel, especially in marine and industrial environments, even with performances better than other polyaniline-based conductive polymers. The substitution of zinc and its derivatives with the electroconductive poly[2,2?-(3-alkyl-acetate)thiophene] (PTE) polymers in anti-corrosive epoxy and alkyd priming paints is technologically viable and, as a consequence, reduces the aggressive effect caused by these transition metals on the environment.