Method to increase resistance against stain penetration of aqueous coating compositions

摘要

The disclosure relates to a method for improving stain resistance and penetration resistance of aqueous coating compositions, which method comprises providing a coating composition which contains at least one pigment, at least one film-forming polymer in the form of an aqueous polymer dispersion and at least one anionic surfactant, wherein the anionic surfactant comprises at least 85 % by weight, based on the total weight of anionic surfactant in the coating composition, of at least one anionic surfactant S, which is selected from semi-esters of sulfuric acid or phosphoric acid with an alcohol A, which alcohol A carries at least one alkyl radical having from 8 to 30 carbon atoms or an alkyl substituted phenyl radical wherein alkyl has from 4 to 30 carbon atoms and which alcohol A may carry an oIigo-C2-C3 alkylene- ether group provided that the number of repeating units in the oIigo-C2-C3- alkylene-ether group is at most 15, or a salt thereof.